RF4558-000

PolySwitch[®] Resettable PPTC **Datasheet** 

**Automotive femtoASMDC** Surface Mount 

## **Description** 

The femtoASMD is the first small-sized 0603 PPTC series from Littelfuse with AEC-Q200 qualification for automotive applications and it provides surface mount overcurrent protection for applications where space is a prime concern and resettable protection is desired. 

## **Features & Benefits** 

## **Additional Information** 

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- Products meet applicable automotive industry standards 

   - Meets ever-increasing demand for compact and space-saving designs due to more electronics content in vehicle 

- Compatible with high-volume electronics assembly 

   - Restores system operation after reset when fault condition is removed, thus provides safety and protection 

- Small footprint – 0603 size 

- Resettable solution against overcurrent and short-circuit 

- AEC-Q200 qualified, RoHS compliant, and ISO/TS16949 certified 

   - Able to meet most stringent requirements for the extreme harsh automotive environment 

- Surface-mount form factor 

- Expertise from the world’s leading resettable overcurrent ■ Suitable for standard protection manufacturer PCB assembly to enable 

- ■ automated mass production 

- Provides wider range of form factors to enhance design flexibility 

## **Applications** 

- Automotive and industrial transportation 

- Actuators and medium motors 

- Trace protection 

- Harness/junction box protection 

- Powered outputs 

- Electronic control modules 

- Telematics/Infotainment 

## **Electrical Characteristics** 

|**Part**|**Ordering**|**IH(A)@**|**IH(A)@**|**IT**|**VMAX**|**IMAX**|**PD Typ**|**Max Time-to-trip**|**Max Time-to-trip**|**RMIN**|**R1MAX**|**RaMAX**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|**Number**|**Part Number**|**(R1MAX)**|**(RaMAX)**|**(A)**|**(VDC)**|**(A)**|**(W)**|**(A)**|**(s)**|**(Ω)**|**(Ω)**|**(Ω)**|
|||||**femtoASMDC – 12-15V**||**femtoASMDC – 12-15V**|||||||
|femtoASMDC005F|RF4558-000|0.05|0.05|0.15|15|10|0.50|0.50|0.10|3.80|30.00|30.00|
|femtoASMDC008F|RF4559-000|0.08|0.08|0.20|12|10|0.50|0.60|0.10|2.80|14.00|14.00|
|femtoASMDC010F/15|RF4560-000|0.10|0.10|0.30|15|10|0.50|0.70|0.10|2.00|14.00|14.00|



## **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 femtoASMDC** Surface Mount 

## **Temperature Rerating** 

||||**Maximum Ambient Temperature**|**Maximum Ambient Temperature**|||||
|---|---|---|---|---|---|---|---|---|
|Part Number|-40°C|-20°C|0°C<br>20°C<br>25°C|40°C|50°C|60°C|70°C|85°C|
||||**Hold Current (A)**<br>**femtoASMDC – 12-15V**||||||
|femtoASMDC005F|0.08|0.07|0.06<br>0.05<br>0.05|0.04|0.04|0.03|0.03|0.02|
|femtoASMDC008F|0.13|0.11|0.10<br>0.08<br>0.08|0.07|0.06|0.06|0.05|0.04|
|femtoASMDC010F/15|0.16|0.14|0.12<br>0.11<br>0.10|0.09|0.08|0.07|0.06|0.04|



## **Temperature Rerating Curve** 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised:  GD. 10/29/21 

**2** 

PolySwitch[®] Resettable PPTC **Datasheet** 

**Automotive femtoASMDC** Surface Mount 

## **Typical Time-to-Trip Curves at 25°C** 

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femtoASMDC<br>A  =  femtoASMDC005F<br>B  = femtoASMDC008F<br>C  = femtoASMDC010F/15<br>**----- End of picture text -----**<br>


## **Physical Specifications** 

||**Physical Specifications**|
|---|---|
|**Terminal Pad Material**|100% Matte Tin with Nickel Underplate|
|**Soldering Characteristics**|Solderability per ANSI-J-STD-002 Category 3|
|**Solder Heat Withstand**|per IEC 60068-2-20, Test Tb, Section 5, Method 1a|
|**Flammability**|per IEC 60695-11-5 Needle Flame Test for 20 seconds|
|**Recommended Storage**<br>**Conditions**|40°C max, 70% RH max; Devices May Not Meet Specified Ratings if Storage Conditions are Exceeded|
|**Operation Temperature**|-40°C~85°C|



**Note:** See PS400 for other physical specifications. 

## **Environmental Specifications** 

|**Test**|**Conditions**|**Resistance Change**|
|---|---|---|
|**Passive Aging**|60°C, 1000 hrs<br>85°C, 1000 hrs|±3% Typical<br>±5% Typical|
|**Humidity Aging**|85°C, 85% R.H., 100 hrs|±1.2% Typical|
|**Thermal Shock**|85°C, -40°C 20 times<br>125°C, -55°C 10 times|-33% Typical<br>-33% Typical|
|**Solvent Resistance**|Freon<br>Trichloroethane<br>Hydrocarbons|No change<br>No change<br>No change|



|**Moisture Resistance Level**|Level 1, 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.|



© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised:  GD. 10/29/21 

**3** 

PolySwitch[®] Resettable PPTC **Datasheet** 

**Automotive femtoASMDC** Surface Mount 

**Dimension Figures** 

**Figure 1** 

**Dimensions** 

|||||**Dimensions in Millimeters (Inches)**|**Dimensions in Millimeters (Inches)**|**Dimensions in Millimeters (Inches)**|**Dimensions in Millimeters (Inches)**|||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|**Part Number**|**A**||**B**||**C**||**D**||**E**||**Figure**|
||**Min**|**Max**|**Min**|**Max**|**Min**|**Max**|**Min**|**Max**|**Min**|**Max**||
|||||**femtoASMDC – 12-15V**||||||||
|femtoASMDC005F|1.40<br>(0.055)|1.80<br>(0.071)|0.45<br>(0.017)|0.85<br>(0.033)|0.60<br>(0.023)|1.00<br>(0.039)|0.10<br>(0.004)|0.50<br>(0.020)|0.075<br>(0.003)|—|1|
|femtoASMDC008F|1.40<br>(0.055)|1.80<br>(0.071)|0.45<br>(0.017)|0.85<br>(0.033)|0.60<br>(0.023)|1.00<br>(0.039)|0.10<br>(0.004)|0.50<br>(0.020)|0.075<br>(0.003)|—|1|
|femtoASMDC010F/15|1.40<br>(0.055)|1.80<br>(0.071)|0.45<br>(0.017)|0.85<br>(0.033)|0.60<br>(0.023)|1.00<br>(0.039)|0.10<br>(0.004)|0.50<br>(0.020)|0.075<br>(0.003)|—|1|



**Recommended Pad Layout** 

**Packaging and Marking Information** 

|**Part**|**Tape and Reel**|**Standard**|**Part**|**Recommended Pad Layout Figures**<br>**[mm (in)]**|**Recommended Pad Layout Figures**<br>**[mm (in)]**|
|---|---|---|---|---|---|
|**Number**|**Quantity**|**Package**|**Marking**|**Dimension A**<br>**(Min*/Nom)**|**Dimension B**<br>**(Nom)**<br>**Dimension C**<br>**(Nom)**|
|||**femtoASMDC – 12-15V**||||
|femtoASMDC005F|4,000|20,000|A|0.80 (0.032)|0.60 (0.024)<br>0.80 (0.032)|
|femtoASMDC008F|4,000|20,000|T|0.80 (0.032)|0.60 (0.024)<br>0.80 (0.032)|
|femtoASMDC010F/15|4,000|20,000|B|0.80 (0.032)|0.60 (0.024)<br>0.80 (0.032)|



* These devices are intended for use in automotive applications. 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised:  GD. 10/29/21 

**4** 

PolySwitch[®] Resettable PPTC **Datasheet** 

**Automotive femtoASMDC** Surface Mount 

## **Solder Reflow Recommendations** 

|**Profile Feature**|Pb-Free Assembly|
|---|---|
|**Average ramp up rate (TsMAX to Tp)**|3°C/s max|
|**Preheat**||
|•  Temperature min (TsMIN)|150°C|
|•  Temperature max (TsMAX)|200°C|
|•  Time (tsMINto tsMAX)|60-120 s|
|**Time maintained above:**||
|•  Temperature (TL)|217°C|
|•  Time (tL)|60-150 s|
|**Peak/Classification temperature (Tp)**|260°C|
|**Time within 5°C of actual peak temperature**||
|Time (tp)|30 s max|
|**Ramp down rate**|3°C/s max|
|**Time 25°C to peak temperature**|8 min max|



**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.) 

## **Part Ordering Number System** 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised:  GD. 10/29/21 

**5** 

PolySwitch[®] Resettable PPTC **Datasheet** 

**Automotive femtoASMDC** Surface Mount 

## **Tape and Reel Specifications** 

|**Description**<br>**W**|**femtoASMDC**<br>**EIA 481-1**|
|---|---|
||**femtoASMDC005F**<br>**femtoASMDC008F**<br>**femtoASMDC010F/15**<br>8.0 ± 0.30|
|**P0**|4.0 ± 0.10|
|**P1**|4.0 ± 0.10|
|**P2**|2.0 ± 0.05|
|**A0**|0.95 ± 0.05|
|**B0**|1.85 ± 0.05|
|**B1 max**|4.35|
|**D0**|1.55 ± .05|
|**F**|3.50 ± 0.05|
|**E1**|1.75 ± 0.10|
|**E2 min**|6.25|
|**T max**|0.3|
|**T1 max**|0.1|
|**K0**|0.90 ± 0.1|
|**A max**|185|
|**N min**|50|
|**W1**|8.4 + 1.5/-.00|
|**W2 max**|14.4|



© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised:  GD. 10/29/21 

**6** 

PolySwitch[®] Resettable PPTC **Datasheet** 

**Automotive femtoASMDC** Surface Mount 

## **Tape and Reel Diagrams** 

**Figure 1** 

**Figure 2** 

## **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. **7** Specifications are subject to change without notice. ~~‘iitaneSS~~ 

© 2021 Littelfuse, Inc. **7** Specifications are subject to change without notice. Revised:  GD. 10/29/21