Resettable Fuses – PTCs...PTC Characteristics and Terminology A polymeric PTC (positive...
Transcript of Resettable Fuses – PTCs...PTC Characteristics and Terminology A polymeric PTC (positive...
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Resettable Fuses – PTCs
Selection GuidePTC Characteristics &
Technologies
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Martin UnsöldSenior Marketing Manager
Relays, Batteries, Fuses, Switches & Thermal Management
Due to increasing demands for electronic components in more and more ambitious applications, the protection of these systems has become very important. Especially in cost intensive applications a reliable over current protection has to be ensured. A right circuit protection has therefor a direct influence on the correct function of the application and on its long life cycle and quality.
With Littelfuse Rutronik is sharing a long term partnership with one of the market leaders in the field of circuit protection components. As a result of the wide product portfolio and the high innovation grade of Littelfuse we are able to offer a suitable product for all kinds of challenges.
Rutronik and Littelfuse – a Strong Partnership
Resettable Fuses – PTCs
Wherever a replacement of the protection components in case of need is not possible, the use of resettable fuses is indispensable.
Another key role plays miniaturization. The available space on a circuit board is limited for which reason the protection device has to meet this requirement as well.Littelfuse offers a full range of surface mount, radial leaded and axial leaded (battery strap) PTC resettable overcurrent suppression devices. Surface mount PTCs are available with broad range of hold current from 0.05A to 7.0A while footprint varies from 0402 to 2920.
Radial PTCs are rated from 6VDC to 600VDC respectively, and are designed for use in higher voltage applications that require minimal maintenance and are subject to repetitive overcurrent conditions.
Axial PTCs are rated from 6VDC to 30VDC, and are designed for use in battery pack applications that require thermal protection against overcurrent fault conditions.
All Littelfuse PTC devices are recognized under the Components Program of Underwriters Laboratory for both the US and Canada as well as being certified by TUV. All devices are leadfree and RoHS compliant.
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PTC Characteristicsand TerminologyA polymeric PTC (positive temperature coeffi cient) overcurrent protector is an element placed in series with the circuit or assembly to be protected. The PTC element protects the circuit by changing from a low-resistance to a high resistance state in response to an overcurrent.
This function is called “tripping” of the overcurrent protection device.
Overcurrent circuit protection can be accomplished with the use of either a traditional fuse or the more recently developed resettable PTC. Both devices function by reacting to the heat generated by the excessive current fl ow in the circuit. The fuse element melts open, interrupting the current fl ow, while the PTC changes from low resistance to high resistance to limit current fl ow. The graph below shows the response of the PTC device to temperature.
Understanding the differences in performance between the two types of devices will make the best circuit protection choice easier. The most obvious difference is that the PTC is resettable. This is an inherent characteristic in which the PTC resets (returns to low resistance state) after power is removed and the device cools down. There are a number of other operating characteristics that differentiate the two types of products.
The terminology used for PTCs is often similar but not the same as for fuses. Two parameters that fall into this category are leakage current and fault current rating.
LEAKAGE CURRENT: A PTC is said to have “tripped” when it has transitioned from its low resistance state to a high resistance state due to overload current.
Protection is accomplished by limiting the current fl ow to a low leakage level. Leakage current can range from less than a hundred milliamps at rated voltage up to a few hundred milliamps at lower voltages. The fuse on the other hand completely interrupts the current fl ow and this open circuit results in no leakage current after it has been subjected to an overload current.
FAULT CURRENT: The PTC is rated for a maximum short circuit current at rated voltage. This fault current level is the maximum current that the device can safely limit keeping in mind that the PTC will not actually interrupt the current fl ow (see LEAKAGE CURRENT above). The typical short circuit rating of a board-mounted PTC is 40A; for battery strap PTCs, this value can reach 100A. Fuses do in fact interrupt the current fl ow in response to the overload and the range of interrupting ratings vary from tens of amperes up to 10,000 amperes at rated voltage.
OPERATING VOLTAGE RATING: General use PTCs are not rated above 60V while fuses are rated up to 600V.
HOLD CURRENT RATING: The hold (operating) current rating for PTCs can be up to 14A while the maximum level for fuses can exceed 30A.
TEMPERATURE DERATING: The useful upper limit for a PTC is generally 85°C while the maximum operating temperature for fuses is 125°C. The following temperature derating curves (see chart at bottom of page) that compare PTCs to fuses illustrate that more derating is required for a PTC at a given temperature.
Additional operating characteristics can be reviewed by the circuit designer in making the decision to choose a PTC or a fuse for overcurrent protection.
AGENCY APPROVALS: PTCs are Recognized under the Component Program of Underwriters Laboratories to UL Standard 1434 for Thermistors. The devices have also been approved for use in Canada by Underwriters Laboratories. Approvals for fuses include Recognition under the Component Program of Underwriters Laboratories and the CSA Component Acceptance Program. In addition, many fuses are listed in accordance with UL/CSA/ANCE (Mexico) 248-14, Supplemental Fuses.
RESISTANCE: Reviewing product specifi cations indicates that similarly-rated PTCs have about twice (sometimes more) the resistance of fuses.
TIME-CURRENT CHARACTERISTIC: Comparing the time-current curves of PTCs to time-current curves of fuses show that the speed of response for a PTC is similar to the time delay of a Slo-Blo® fuse.
Log
resi
stan
ce (o
hms)
Temperature (°C)
Trip Point
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Temperature Derating Curves Comparing PTCs to Fuses
Chart Key
Curve A Thin-Film Fuses and 313 Series (.010 to .150A)
Curve B FLAT-PAK®, Telelink®, Nano2®, PICO®, Blade Terminal, Special Purpose and other leaded and cartridge fuses (except 313.010 – .150A)
Curve C Resettable PTCs
-60°C-76°F
20
40
60
80
100
120
140
-40°C-40°F
-20°C-4°F
25°C
C
C
A
B
AMBIENT TEMPERATURE
PE
RC
EN
T O
F R
AT
ING
A
B
0°C32°F
20°C68°F
40°C104°F
60°C140°F
80°C176°F
100°C212°F
120°C248°F
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PTC Selection Table (cont.)BATTERY STRAP (AXIAL LEADED)
Series Name 60R 250R 600R ST LT LR VT VL
Photos
Chip Size
Hold Current (IHOLD) 0.1-3.75A 0.08-0.18A 0.15-0.16A 1.2-4.2A 0.7-3.4A 1.9-10.00A 1.7-2.4A 1.7-2.3A
Max voltage (VMAX) 60V 60/250V 60/600V 15/24V 15/24V 15/20V 16V 12V
Max fault current (IMAX) 40A 3/10A 3/2.2A 100A 100A 100A 100A 100A
Operating Temperature Range -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C
Agency approval cULus, TUV cULus, TUV cULus, TUV cULus, TUV cULus, TUV cULus, TUV cULus, TUV cULus, TUV
RoHS Compliant Yes Yes Yes Yes Yes Yes Yes Yes
Lead-Free Yes Yes Yes Yes Yes Yes Yes Yes
COMPETITOR CROSS
Tyco/Raychem Series RXE TR250 TR600 SRP LTP LR4 VTP VLR
Amp Rating 0.100-3.75A 0.080-0.180A 0.150-0.160A 1.20-4.20A 0.700-3.40A 1.7-13A 1.10-2.40A 2.10-2.30A
Max voltage 60-72V 60/250V 60/600V 15/30V 24V 15/20V 16V 16V
Bourns Series MF-R/MF-RX MF-R/250 MF-R/600 MF-S MF-LS MF-LR MF-VS
Amp Rating 0.10-3.75A 0.08-0.18A 0.15-0.16A 1.2-4.2A 0.70-3.4A 1.9-9.0A 1.7-2.4A NA
Max voltage 60V 60/250V 60/600V 15-30V 15-24V 15-20V 16V NA
NA = Not Available
PTC Selection TableSURFACE MOUNT RADIAL LEADED
Series Name 0805L 1206L 1210L 1812L 2016L 2920L USBR 30R
Photos
Chip Size 0805 (2012) 1206 (3216) 1210 (3225) 1812 (4532) 2016 (5041) 2920 (7351)
Hold Current (IHOLD) 0.10-1.00A 0.125-2.00A 0.05-1.75A 0.10-2.60A 0.3-2.00A 0.30-3.00A 0.75-2.5A 0.9-9.00A
Max voltage (VMAX) 15V 30V 30V 60V 60V 60V 16V 30V
Max fault current (IMAX) 40A 100A 100A 100A 40A 40A 40A 40A
Operating Temperature Range -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C
Agency approval cULus, TUV cULus, TUV cULus, TUV cULus, TUV cULus, TUV cULus, TUV cULus, TUV cULus, TUV
RoHS Compliant Yes Yes Yes Yes Yes Yes Yes Yes
Lead-Free Yes Yes Yes Yes Yes Yes Yes Yes
COMPETITOR CROSS
Tyco/Raychem Series nano SMD micro SMD mini SMD mid SMD SMD RUSB RUE
Amp Rating NA 0.500-1.50A 0.050-1.50A 0.140-2.60A 0.300-2.00A 0.300-3.00A 0.750-2.50A 0.900-9.00A
Max voltage NA 6V 6-30V 6-60V 6-60V 6-60V 16V 30V
Bourns Series MF-NSMF MF-USMD MF-MSMD MF-SMDF MF-SM MF-R
Amp Rating NA 0.12-2.00 0.05-1.50A 0.05-1.50A 0.55-2.00A 0.300-2.5A NA 0.90-9.0A
Max voltage NA 6-30V 6-30V 6-30V 10-60V 6-60V NA 30V
NO = Not offered
Selection Process1. Determine the following circuit operating
parameters: • Normal operating current – IHOLD
• Maximum circuit voltage – VMAX
• Maximum interrupt current – IMAX
• Ambient operating temperature
2. Select the suitable form factor.
3. Compare the PTC data sheet ratings on littelfuse.com for VMAX and IMAX to ensure
that the circuit parameters do not exceed these ratings.
4. Verify that the ambient operating temperature within close proximity to the device is within its normal operating range. Thermally derate IHOLD and IMAX as necessary. See equation below.
5. Check that the trip time protects the circuit.
6. Verify that the post trip resistance (R1MAX) of the device is taken into account in the circuit design.
7. Independently test and evaluate the suitability and performance of the PTC in the actual application.
IHOLD = IMAX
Thermal derating factor
Series Name LoRho PTC (Low Resistance) 0603L 0805L 1206L 1210L 1812L 2016L 2920L 250S
Types
Chip Size0402 0603 0805 1206 1812 2920
0603 (1608) 0805 (2012) 1206 (3216) 1210 (3225) 1812 (4532) 2016 (5041) 2920 (7351) see data sheet
Hold Current (IHOLD) 0.1-7.0A 0.04-0.5A 0.10-1.00A 0.125-2.00A 0.05-2.00A 0.10-2.60A 0.3-2.00A 0.30-5.00A 0.13 A
Max voltage (VMAX) 6 / 12 V 6 - 15V 15V 30V 30V 60V 60V 60V 60V
Max fault current (IMAX) 50 40A 40A 100A 100A 100A 40A 40A 3A
Operating Temp. Range -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C
Agency approval cUR, UR, TUV, Halogen Free
cUR, UR, TUV, Halogen Free
cUR, UR, TUV, Halogen Free
cUR, UR, TUV, Halogen Free
cUR, UR, TUV, Halogen Free
cUR, UR, TUV, Halogen Free
cUR, UR, TUV, Halogen Free
cUR, UR, TUV, Halogen Free
TUV, Halogen Free
RoHS Compliant YES YES YES YES YES YES YES YES YES
Lead-Free YES YES YES YES YES YES YES YES YES
Competitor CrossTyco/Raychem Series Low Rho SMD femtoSMD nano SMD micro SMD mini SMD mid SMD SMD TS250
Amp Rating 1.75-5.0A 0.05-0.2A NA 0.500-1.50A 0.050-1.50A 0.140-2.60A 0.300-2.00A 0.300-3.00A 0.13A
Max voltage 6V 9 - 15V NA 6V 6-30V 6-60V 6-60V 6-60V 60V
Bourns Series N/A MF-FSMF MF-NSMF MF-USMD MF-MSMD MF-SMDF MF-SM MF-SM013
Amp Rating N/A 0.1 - 0.5A NA 0.12-2.00A 0.05-1.5A 0.05-1.5A 0.55-2.00A 0.300-2.5A 0.13A
Max voltage N/A 6 - 15V NA 6-30V 6-30V 6-30V 10-60V 6-60V 60V
Surface Mount
RADIAL LEADED BATTERY STRAP (AXIAL LEADED)
Series Name USBR 16R 30R 60R 72R 250R 600R SL (Low Resistance)
Types
Hold Current (IHOLD) 0.75-2.5A 2.5-14A 0.9-9.00A 0.1-3.75A 0.2-3.75A 0.08-0.18A 0.15-0.16A 1.9-3.7A
Max voltage (VMAX) 16V 16V 30V 60V 72V 60/250V 60/600V 6V
Max fault current (IMAX) 40A 100A 40A 40A 40A 3/10A 3/2.2A 50A
Operating Temp. Range -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C
Agency approval cUR, UR, TUV cUR, UR, TUV cUR, UR, TUV cUR, UR, TUV cUR, UR, TUV cUR, UR, TUV cUR, UR, TUV cUR, UR, TUV, Halogen Free
RoHS Compliant YES YES YES YES YES YES YES YES
Lead-Free YES YES YES YES YES YES YES YES
Competitor CrossTyco/Raychem Series RUSB RGRF / AGRF RUE RXE RXE TR250 TR600 N/A
Amp Rating 0.750-2.50A 2.5-14A 0.900-9.00A 0.100-3.75A 0.05-3.75A 0.080-0.180A 0.150-0.160A N/A
Max voltage 16V 16V 30V 60-72V 72V 60/250V 60/600V N/A
Bourns Series MF-RG/ MF-R MF-R MF-R/MF-RX MF-RX/72 MF-R/250 MF-R/600 N/A
Amp Rating NA 3-11A 0.90-9.0A 0.10-3.75A 0.2-3.75A 0.08-0.18A 0.15-0.16A N/A
Max voltage NA 16V 30V 60V 72V 60/250V 60/600V N/A
6
PTC Applications PTCs are used as circuit protection in applications where sensitive components are at risk of damage from overcurrent conditions. The ability of PTCs to reset themselves after exposure to a fault current makes them ideal for use in circuits that are not easily accessible to a user or technician. Typical applications include port protection on personal computers (USB, Firewire, keyboard/mouse, and serial ports), peripherals (hard drives, video cards, and hubs), cell phone, battery packs, industrial controls, lighting ballast and motor controls.
When to apply a resettable PTC vs. a traditional fuse is always the choice of the designer or technician but in some cases, PTC’s offer a convenient form of circuit protection to improve the reliability of an application. There is an important area of applications where the use of resettable fuses (PTCs) has become a requirement. Much of the design work for personal computers and peripheral devices is strongly infl uenced by the Microsoft and Intel System Design Guide which states that “Using a fuse that must be replaced each time an overcurrent condition occurs is unacceptable.” And the SCSI (Small Computer
Systems Interface) Standard for this large market includes a statement that “....a Positive Temperature Coeffi cient device must be used instead of a fuse, to limit the maximum amount of current sourced”.
The application selection guide below should be used as an aid in selecting the proper device for your end application. Please consult the datasheets on www.littelfuse.com for detailed technical specifi cations.
SURFACE MOUNT RADIAL LEADED BATTERY STRAP (AXIAL LEADED)
Series Name 0805L 1206L 1210L 1812L 2016L 2920L USBR 30R 60R 250R 600R ST LT LR VT VL
Tele
com
Application
Ul60950 ,TIA-968-A, GR-1089 Requirements X X
ITU-T Recoomendations X X
CPE (Customer Premises Equipment) X X
Analog Line Card X X
T1/E1/J1 And HDSL X X
ISDN X X
ADSL X X
Cable Telephony X X
PBX/KTS And Key Telephone System X X
Com
pute
r
CPU X X
USB X X X X X
IEEE1284 Parallel Data Bus X X X X
IEEE 802.3 X X X
IEEE 1394 X X X
I/O Ports X X X X X
PC Card X X X X X X
SCSI X X X X X
Video Port X X X X X
LCD Monitor X X X X X
Con
sum
er
Elec
tron
ics
Set Top Box X X X X
Loudspeaker X
Smart Card Reader X
Mobile Phone X X X
Linear AC/DC Adapter X X X X X X X
Portable Electronic Input Port X X X X X
Electromagnetic Loads, Motor X X X X
Solenoid Protection X X X X
Bat
tery Lithium Cell X X X X X
Battery Pack X X X X X
Med
ical
elec
tron
ic
Voltage / Current Input Terminal X X
NOTE: The application summary is for reference only. Determination of suitability for a specific application is the responsibility of the customer.
3
SURFACE MOUNT RADIAL LEADED BATTERY STRAP
Series Name LoRho 0603L 0805L 1206L 1210L 1812L 2016L 2920L 250S USBR 16R 30R 60R 72R 250R 600R LR LR LT ST VL VT
Tele
com
ApplicationUl60950 ,TIA-968-A, GR-1089 Req’s X X XITU-T Recoomendations X X XCPE (Customer Premises Equipment) X X XAnalog Line Card X X XT1/E1/J1 And HDSL X X XISDN X X XADSL X X XCable Telephony X X XPBX/KTS And Key Telephone System X X X
Co
mp
ute
r
CPU X X XUSB X X X X X X X XIEEE1284 Parallel Data Bus X X X X XIEEE 802.3 X X X XIEEE 1394 X X XI/O Ports X X X X X X X X XPC Card X X X X X X X X XSCSI X X X X X XVideo Port X X X X X XHDMI/LCD Monitor X X X X X X X
Co
nsu
mer
E
lect
ron
ics
Set Top Box X X X XLoudspeaker XSmart Card Reader XMobile Phone X X X X XLinear AC/DC Adapter X X X X X X X X XPortable Electronic Input Port X X X X X X XElectromagnetic Loads, Motor X X X X XSolenoid Protection X X X X X
Bat
tery Lithium Cell X X X X X X
Battery Pack X X X X X X X X X
Med
ical
E
lect
ron
ic
Voltage / Current Input Terminal X X
NOTE: The application summary is for reference only. Determination of suitability for a specific application is the responsibility of the customer.
7
4
Out
side
Wor
ld D+D -
VBUS
SignalGround
ShieldGround
1206L150
USB Port USB ControllerV5.5MLA063
(2) PGB1010603(PulseGuard®
ESD Suppressor)
Out
side
Wor
ld D+D -
VBU
SignalGround
ShieldGround
(2) V0402MHS03
1206L150
USB Port USB ControllerV5.5MLA0603V5.5MLA0603
USB 1.1 USB 2.0Te
lco
Tip
SignalGround
600R Series250R Series
RJ11 Connector Tx/Rx Circuits
SMD/leadedSIDACtor®
Device
RingOut
side
Wor
ld TPA+TPA-
VBU
SignalGround
ShieldGround
1812L110/33
1394 Port 1394 ControllerV33MLA1206
(4) PGB1010603
(PulseGuard®
ESD Suppressor)
TPB+TPB-
IEEE 1394 – FireWire Tip/Ring circuit – Metallic
Littelfuse offers a full range of battery strap, surface mount and radial leaded resettable PTC devices designed to protect applications where overcurrent protection is
required. The following are typical examples of circuits using POLYFUSE® resettable PTCs in combination with other Littelfuse circuit protection devices to provide
complete protection for the circuit. Contact your location Littelfuse application expert for additional design assistance or visit www.littelfuse.com/PTCs.
Cell
Phon
e
Battery -
Control
Battery +
SignalGround
ShieldGround
(3) V5.5MLA0402(MultilayerVaristor)
Battery Connector Battery Controller IC
Data Pair
Data Pair Data Pair
Data Pair
Power SourceEquipment
(PSE)
Powered Device
(PD)
Swtich/Hub Powered End Station
Power Over Ethernet Li-ion Battery Pack
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Yverdon-les-Bains Rue Galilée 15, 1400 Yverdon-les-Bains Tel. +41 24 4 23 91 40
Turkey Partner of Rutronik group: Elektro Elektronik San. Tic. A.S. Burhaniye Mah. Bahceler Sokak No:10 Beylerbeyi 34676 Uskudar/Istanbul Tel. +90 216 557 67 00
United Kingdom & Ireland Rutronik UK Ltd. Deakins Business Park, Blackburn Road, Egerton BL7 9RP Bolton, Lancashire Tel. +44 1204 60 22 00
Rome Via Giulio Vincenzo Bona, 87 00156 Roma (RO) Tel. +39 06 228 782-1
Turin Strada Torino, 43/45 Europalace 10043 Orbassano (TO) Tel. +39 011 9 02 20 00
Lithuania Rutronik Elektronische Bauelemente GmbH Raudondvario pl.76 47182 Kaunas Tel. +370 37 26 17 80
Norway Rutronik Elektronische Bauelemente GmbH Olav Helsets vei 6 0694 Oslo Tel. +47 22 76 79 20
Netherlands Rutronik Elektronische Bauelemente GmbH Papland 4a 4206 CL Gorinchem Tel. +31 183 64 60-50
Poland Rutronik Polska Sp. z o.o. ul. Bojkowska 37 44-101 Gliwice Tel. +48 32 4 61 20 00
Gdynia ul. Batorego 28-32 81-366 Gdynia Tel. +48 58 7 83 20-20
Warsaw ul. Patriotów 110 04-844 Warszawa Tel. +48 22 3 32 73-70
Portugal Rutronik Elektronische Bauelemente GmbH Av. General Humberto Delgado Porta 8, 1ºAndar, Sala R 4760-012 V. N. Famalicão Tel. +351 252 3 12-336
International branches:
European branches:
Shanghai Room 1710, Dongchen Tower No. 60, Mudan Road Pudong New Distr., Shanghai Tel. +86 216 8869 910
Hong Kong Rutronik Electronics Asia HK Ltd.
Hong Kong 54/F, Hopewell Centre 183 Queens Road East Wan Chai Tel. +852 5337 0119
Mexico Rutronik Mexico S.A. DE C.V.
Ecuador Nº 4 Lomas de Queretaro 76190 Queretaro Tel. +52 442 242 5361
Chengdu Room no. 407, 4F No. 31 Zong Fu Street 610016 Chengdu Tel. +86 28 8651 2214
Taiwan Rutronik Electronics Asia HK Ltd.
Taipei (Taiwan branch) 13F.-2, No.27, Lane 169, Kangning St., Xizhi District 221 New Taipei City Tel. +886 (2) 2692 7041
China Rutronik Electronics SZ Ltd.
Shenzhen Room 807, Excellence Bldg., No. 98, Fuhua 1 Road Futian Distr., Shenzhen Tel. +86 755 8240 7106
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