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RF4572-000
Resettable Fuse, PPTC, 2920 (7351 Metric), PolySwitch ASMDC Series, 60 VDC, 500 mA, 1 A, 4 s
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: LITTELFUSE
- Product type: Surface Mount PPTCs
- SVHC: To Be Advised
- Time to Trip: 4s
- Trip Current: 1A
- Product Range: PolySwitch ASMDC Series
- Voltage Rating: 60VDC
- Holding Current: 500mA
- PPTC Case Style: 2920 (7351 Metric)
- Current Rating Max: 10A
- Operating Temperature Max: 85°C
- Operating Temperature Min: -40°C
- Automotive Qualification Standard: AEC-Q200
| Delivery and price | |
|---|---|
| Units per pack | 2000 |
| Price | 0.311 € |
| Current stock | 1000+ |
| Lead time | 30 days |
Datasheet
PolySwitch[®] Resettable PPTC **Datasheet** **Automotive ASMDC Series** Surface Mount ## HF C_] **RoHS** @ ## **Description** The ASMDC PPTC offers a lower profile form factor for better space saving and provides higher VDC and IHOLD rating, most robust performance compared to the competitors in the market. ## **Features & Benefits** **Additional Information** **Resources Accessories Samples** - Products meet applicable automotive industry standards - Compatible with high-volume electronics assembly - Lower Profile – Comparing to the existing 2920 size ASMD series - Resettable solution against overcurrent and short-circuit - AEC-Q200 qualified, RoHS compliant, and ISO/TS16949 certified - Surface-mount form factor - High Performance expertise from the world’s leading resettable overcurrent protection manufacturer - Provides wider range of form factors to enhance design flexibility - Restores system operation after reset when fault condition is removed, thus provides safety and protection - Able to meet most stringent requirements for the extreme harsh automotive environment - Suitable for standard PCB assembly to enable automated mass production ## **Applications** - Harness/junction box protection - Automotive and industrial transportation - Powered outputs - Actuators and medium Powered outputs motors ■ Electronic control modules - Trace protection - Telematics/Infotainment ## **Electrical Characteristics** |ASMDC030F|RF4571-000|0.30|0.30|0.60|60|10|1.50|1.50|3.00|0.30|3.40|3.40| |---|---|---|---|---|---|---|---|---|---|---|---|---| |ASMDC050F|RF4572-000|0.50|0.50|1.00|60|10|1.50|2.50|4.00|0.15|1.20|1.20| |ASMDC075F|RF4573-000|0.75|0.75|1.50|33|40|1.50|8.00|0.30|0.10|0.61|0.61| |ASMDC125F/33|RF4574-000|1.25|1.25|2.50|33|40|1.50|8.00|2.00|0.04|0.25|0.25| |ASMDC185F/33|RF4575-000|1.85|1.85|3.70|33|40|1.70|8.00|2.50|0.05|0.15|0.15| |ASMDC300F/24|RF4576-000|3.00|3.00|6.00|24|40|1.70|8.00|5.00|0.015|0.072|0.072| **Notes:** - **IH :** Hold current: maximum current device will pass without interruption in 25°C, unless otherwise specified - **IT :** Trip current: minimum current that will switch the device from low-resistance to high-resistance in 25°C still air, unless otherwise specified. - **VMAX :** Maximum voltage device can withstand without damage at rated current. - **IMAX :** Maximum fault current device can withstand without damage at rated voltage. **PD :** Power dissipated from device when in the tripped state in 25°C still air, unless otherwise specified. - **RMIN :** Minimum resistance of device as supplied at 25°C, unless otherwise specified. - **R1MAX :** Maximum resistance of device when measured one hour post reflow, unless otherwise specified. - **RaMAX :** Maximum functional resistance of device after being subjected to the stresses described in PS400 at 25°C, unless otherwise specified. © 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/29/21 **1** PolySwitch[®] Resettable PPTC **Datasheet** **Automotive ASMDC Series** Surface Mount ## **Temperature Rerating** ||||**Temperature Rerating**|**Temperature Rerating**|**Temperature Rerating**|**Temperature Rerating**||||| |---|---|---|---|---|---|---|---|---|---|---| ||||**Maximum Ambient Temperature**|||||||| |Part Number|-40°C|-20°C|0°C|20°C|25°C|40°C|50°C|60°C|70°C|85°C| |||||**Hold Current (A)**||||||| |||||**ASMDC – 24-60V**|**ASMDC – 24-60V**|||||| |ASMDC030F|0.49|0.43|0.37|0.31|0.30|0.25|0.22|0.19|0.16|0.12| |ASMDC050F|0.86|0.75|0.65|0.54|0.50|0.43|0.37|0.32|0.26|0.18| |ASMDC075F|1.17|1.04|0.90|0.77|0.75|0.64|0.57|0.50|0.44|0.34| |ASMDC125F/33|2.02|1.78|1.55|1.31|1.25|1.08|0.96|0.84|0.72|0.54| |ASMDC185F/33|2.83|2.50|2.20|1.85|1.74|1.53|1.37|1.22|1.04|0.80| |ASMDC300F/24|4.70|4.19|3.70|3.17|3.00|2.66|2.41|2.20|1.90|1.50| ## **Temperature Rerating Curve** **==> picture [258 x 152] intentionally omitted <==** **----- Start of picture text -----**<br> 200 FEE<br>150 BEER EEEEEE EEEEEE<br>FSS EEE EEEEEEEEEEEE<br>FREES SEER EEE EE EERE EEE EEEEEH<br>100<br>PEER EEE EERSSEEEC<br>50<br>EEE EEC CE HEPEBS EEE<br>0 EEEEEEEE EEE EERE EEREEEEEET<br>-40 -20 0 20 40 60 80 100 120<br>Ambient Temperature (°C)<br>% of Rated Hold and Trip Current<br>**----- End of picture text -----**<br> ## **Typical Time-to-Trip Curves at 25°C** **==> picture [449 x 141] intentionally omitted <==** **----- Start of picture text -----**<br> 100 _—SS ad<br>a<br>10 ay A B C D E F<br>ASMDC<br>A = ASMDC030F 1<br>B = ASMDC050F SSSSNS ea<br>C = ASMDC075F 0.1<br>D = ASMDC125F/33<br>C<br>E = ASMDC185F/33 0.01 = ee B F<br>F = ASMDC300F/24 A A NN E<br>0.001 FEEEH D<br>0.1 1 10 100<br>Fault Current (A)<br>Time-to-Trip (s)<br>**----- End of picture text -----**<br> © 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/29/21 **2** PolySwitch[®] Resettable PPTC **Datasheet** **Automotive ASMDC Series** Surface Mount ## **Physical Specifications** ||**Physical Specifications**| |---|---| |**Terminal Pad Material**|100%MatteTin with NickelUnderplate| |**Soldering Characteristics**|Solderability per ANSI-J-STD-002Category 3| |**Solder Heat Withstand**|per IEC 60068-2-20,TestTb, Section5,Method1a| |**Flammability**|per IEC 60695-11-5NeedleFlameTestfor 20 seconds| |**Recommended Storage Conditions**|40°Cmax,70%RH max;DevicesMayNotMeet SpecifiedRatingsifStorage Conditions areExceeded| |**Operation Temperature**|-40°C~85°C| ## **Environmental Specifications** |**Test**|**Conditions**|**Resistance Change**| |---|---|---| |**Passive Aging**|60°C, 1000 hrs<br>85°C, 1000 hrs|±3% Typical<br>±5% Typical| |**Humidity Aging**|C, 1000 hrs<br>85°C, 85%R.H.,100hrs|±5% Typical<br>±1.2%Typical| |**Thermal Shock**|85°C,-40°C20 times|-33%Typical| |**Solvent Resistance**|Freon<br>Trichloroethane<br>Hydrocarbons|No change<br>No change<br>No change| **Note:** See PS400 for other environmental specifications. |**Note:** See PS400 for other environmental specifications.|See PS400 for other environmental specifications.| |---|---| |**Moisture Resistance Level**|Level 2a, J-STD-020| |**Storage Conditions**|40°C max, 70% RH max; devices should remain in original sealed bags prior to use.<br>Devices may not meet specified values if these storage conditions are exceeded.| ## **Dimension Figures** **A B** i — ~~a~~ **C D E** ~~ta~~ e tfe ~~t~~ **Figure 1 Dimensions** |ASMDC030F|7.30|7.70|0.63|0.90|4.90|5.30|0.25|0.95|0.20|—|1| |---|---|---|---|---|---|---|---|---|---|---|---| ||(0.287)|(0.303)|(0.025)|(0.035)|(0.193)|(0.209)|(0.010)|(0.040)|(0.008)||| |ASMDC050F|7.30|7.70|0.63|0.90|4.90|5.30|0.25|0.95|0.20|—|1| ||(0.287)|(0.303)|(0.025)|(0.035)|(0.193)|(0.209)|(0.010)|(0.040)|(0.008)||| |ASMDC075F|7.30|7.70|0.63|0.90|4.90|5.30|0.25|0.95|0.20|—|1| ||(0.287)|(0.303)|(0.025)|(0.035)|(0.193)|(0.209)|(0.010)|(0.040)|(0.008)||| |ASMDC125F/33|7.30|7.70|0.45|0.71|4.90|5.30|0.25|0.95|0.20|—|1| ||(0.287)|(0.303)|(0.018)|(0.028)|(0.193)|(0.209)|(0.010)|(0.040)|(0.008)||| |ASMDC185F/33|7.30|7.70|0.90|1.20|4.90|5.30|0.25|0.95|0.20|—|1| ||(0.287)|(0.303)|(0.035)|(0.047)|(0.193)|(0.209)|(0.010)|(0.040)|(0.008)||| |ASMDC300F/24|7.30|7.70|0.80|1.10|4.90|5.30|0.25|0.95|0.20|—|1| ||(0.287)|(0.303)|(0.031)|(0.043)|(0.193)|(0.209)|(0.010)|(0.040)|(0.008)||| © 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/29/21 **3** PolySwitch[®] Resettable PPTC **Datasheet** **Automotive ASMDC Series** Surface Mount ## **Recommended Pad Layout** ## **A** |ist **B** ~~**C**~~ **B** ~~ee~~ ## **Packaging and Marking Information** |**Part**|**Tape and Reel**|**Standard**<br>**Part**|**Recommended Pad Layout Figures**<br>**[mm(in)]**|**Recommended Pad Layout Figures**<br>**[mm(in)]**| |---|---|---|---|---| |**Number**|**Quantity**|**Package**<br>**Marking**|**Dimension A**<br>**(Min*/Nom)**|**Dimension B**<br>**(Nom)**<br>**Dimension C**<br>**(Nom)**| |||**ASMDC – 24-60V**||| |ASMDC030F|4,000|20,000<br>030F|5.30(0.209)|2.00(0.079)<br>4.60(0.18)| |ASMDC050F|4,000|20,000<br>050F|5.30(0.209)|2.00(0.079)<br>4.60(0.18)| |ASMDC075F|4,000|20,000<br>075F|5.30(0.209)|2.00(0.079)<br>4.60(0.18)| |ASMDC125F/33|4,000|20,000<br>125F|5.30(0.209)|2.00(0.079)<br>4.60(0.18)| |ASMDC185F/33|4,000|20,000<br>185F 33V|5.30(0.209)|2.00(0.079)<br>4.60(0.18)| |ASMDC300F/24|4,000|20,000<br>300F 24V|5.30 (0.209)|2.00 (0.079)<br>4.60 (0.18)| ***** These devices are intended for use in automotive applications. ## **Solder Reflow Recommendations** **==> picture [489 x 177] intentionally omitted <==** **----- Start of picture text -----**<br> Profile Feature Pb-Free Assembly<br>Average ramp up rate (TsMAX to Tp) 3°C/s max Tp tp Critical Zone<br>Preheat Ramp Up TL to Tp<br>ay ,<br>• Temperature min (Ts• Temperature max (TsMINMAX) ) 150°C200°C TL TsMAX tL<br>• Time (ts Time maintained above: MIN to tsMAX) 60-120 s TsMIN<br>• Temperature (TL) 217°C Preheatts Ramp Down<br>• Time (tL) 60-150 s<br>Peak/Classification temperature (Tp) 260°C 25 J ) a<br><a t 25˚C to Peak<br>Time within 5°C of actual peak temperature<br>Reflow Profile Time<br>Time (tp) 30 s max<br>Ramp down rate 3°C/s max<br>Time 25°C to peak temperature 8 min max<br>Temperature<br>**----- End of picture text -----**<br> **Note:** All temperatures refer to topside of the package, measured on the package body surface. ## **Solder Reflow** - Recommended reflow method: IR, hot air, nitrogen. - Recommended maximum paste thickness: 0.25mm (0.010in) - Devices can be cleaned using standard methods and aqueous solvents. - Experience has shown the optimum conditions for forming acceptable solder fillets occur when a reasonable amount of solder paste is placed underneath each device’s termination. As such, we request that customers comply with our recommended solder pad layouts. - Customer should validate that the solder paste amount and reflow recommendations meet its application. - We request that customer board layouts refrain from placing raised features (e.g. vias, nomenclature, traces, etc.) underneath PolySwitch devices. It is possible that raised features could negatively impact solderability performance of our devices. **Rework** ■ Standard industry practices. (Please also avoid direct contact to the device.) © 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/29/21 **4** PolySwitch[®] Resettable PPTC **Datasheet** ## **Automotive ASMDC Series** Surface Mount ee ## **Tape and Reel Specifications** **==> picture [488 x 454] intentionally omitted <==** **----- Start of picture text -----**<br> ||||||||| |---|---|---|---|---|---|---|---| |Part Ordering Number System| |ASMDC 125 F /33 -2|ASMDC| |EIA 481-1| |ASMDC030F| |Description| |ASMDC050F|ASMDC185F/33| |Packaging|ASMDC075F|ASMDC300F/24| |2 = Tape and Reel| |ASMDC125F/33| |Alternative Voltage Rating (If Applicable)| |W|16.0 ± 0.30|16.0 ± 0.30| |Lead Free| |P0|4.0 ± 0.10|4.0 ± 0.10| |Hold Current Indicator| |P1|8.0 ± 0.10|8.0 ± 0.10| |IL:|Product Series| |P2|2.0 ± 0.10|2.0 ± 0.10| |A0|5.5 ± 0.1|5.35 ± 0.1| |B0|7.9 ± 0.1|7.85 ± 0.1| |Tape and Reel Diagrams|B1 max|12.1|12.1| |Figure 1|D0|1.5 + 0.10/ -.00|1.5 + 0.10/ -.00| |F|7.50 ± 0.10|7.50 ± 0.10| |P|0|Embossment|E1|1.75 ± 0.10|1.75 ± 0.10| |T|D0|P|2|E1|E2 min|14.25|14.25| |Cover Tape|T max|0.35|0.35| |A|0|F|W|T1 max|0.1|0.1| |B1|K0|B0|E2|K0|0.9 ± 0.1|1.45 ± 0.1| |A max|330|330| |N min|50|50| |T1|Center Lines|P|1|W1|16.4 + 2.0/-.00|16.4 + 2.0/-.00| |of Cavity| |W2 max|22.4|22.4| |Figure 2| |W2 (Measured at Hub)| |A|N (Hub Dia.)| |Cover Tape| |Carrier Tape|W1 (Measured at Hub)| |Embossed Cavity| **----- End of picture text -----**<br> ## **Warning** - Users should independently evaluate the suitability of and test each product selected for their own application. - Operation beyond the maximum ratings or improper use may result in device damage and possible electrical arcing and flame. - These devices are intended for protection against damage caused by occasional overcurrent or overtemperature fault conditions and should not be used when repeated fault conditions or prolonged trip events are anticipated. - Contamination of the PPTC material with certain silicone-based oils or some aggressive solvents can adversely impact the performance of the devices. - Device performance can be impacted negatively if devices are handled in a manner inconsistent with recommended electronic, thermal, and mechanical procedures for electronic components. - PPTC devices are not recommended for installation in applications where the device is constrained such that its PTC properties are inhibited, for example in rigid potting materials or in rigid housings, which lack adequate clearance to accommodate device expansion. - Operation in circuits with a large inductance can generate a circuit voltage (Ldi/dt) above the rated voltage of the device. **Disclaimer Notice -** Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics. © 2021 Littelfuse, Inc. **5** Specifications are subject to change without notice. ~~ional~~ Revised: GD. 10/29/21
Updated at April 12, 2026
Founded in 1927 and headquartered in Chicago, Illinois, Littelfuse is a premier global manufacturer of circuit protection, power control, and sensing technologies. Widely recognized for pioneering the first small, fast-acting protective fuse, the company has grown into an industry leader whose highly reliable components are essential to modern industrial, transportation, and consumer electronics applications worldwide. At the core of the Littelfuse portfolio is an expansive and industry-leading range of circuit protection solutions. This encompasses a massive selection of traditional fuses, fuse holders, and resettable PTC thermistor fuses designed to safely interrupt overcurrent conditions. To defend against electrical overstress, Littelfuse also provides advanced transient voltage suppression (TVS) technologies, including thousands of specialized TVS diodes, TVS varistors, and gas discharge tubes (GDTs) that ensure robust defense against voltage spikes and environmental hazards. Beyond its foundational protection components, Littelfuse manufactures a diverse array of discrete semiconductors, sensors, and switching devices. Engineers rely on their high-performance thyristors, including TRIACs and SCRs, alongside power-efficient Schottky diodes and MOSFETs for demanding power control applications. Complemented by precision proximity sensors and highly reliable reed and solid-state relays, Littelfuse delivers the critical building blocks required for secure, efficient, and complete system design.
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