PICOASMDC050S-2 Equivalent & Substitute Parts

Part Overview

The PICOASMDC050S-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® picoASMDC series. This surface mount component is designed for overcurrent protection in electronic circuits with a maximum voltage rating of 6V and a hold current of 500 mA. The device operates across a temperature range of -40°C to 85°C and carries AEC-Q200 automotive qualification. Substitute parts are identified to provide equivalent electrical and mechanical performance for applications requiring component interchangeability or inventory alternatives.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	500 mA
Current - Trip (It)	1 A
Current - Max	100 A
Time to Trip	100 ms
Resistance - Initial (Ri) (Min)	150 mOhms
Resistance - Post Trip (R1) (Max)	800 mOhms
Operating Temperature	-40°C ~ 85°C
Package / Case	0805 (2012 Metric), Concave
Size / Dimension	0.083" L x 0.055" W (2.10mm x 1.40mm)
Thickness (Max)	0.037" (0.93mm)
Mounting Type	Surface Mount
Ratings	AEC-Q200
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the PICOASMDC050S-2 is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Maximum voltage rating: 6V
Hold current (Ih): 500 mA
Trip current (It): 1 A
Maximum current: 100 A
Time to trip: 100 ms
Initial resistance (Ri): 150 mOhms minimum
Post-trip resistance (R1): 800 mOhms maximum

Mechanical Parameters:

Package type: 0805 (2012 Metric), Concave
Mounting type: Surface Mount
Physical dimensions: 0.083" L x 0.055" W (2.10mm x 1.40mm)
Maximum thickness: 0.037" (0.93mm)

Compliance Parameters:

AEC-Q200 automotive qualification
Product status: Active

Substitute parts must match all electrical specifications, mechanical form factor, and compliance ratings to ensure direct interchangeability in circuit applications.

Parameter Comparison

Parameter	PICOASMDC050S-2	RF5053-000
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Series	PolySwitch® picoASMDC	PolySwitch® picoASMDC
Type	Polymeric	Polymeric
Voltage - Max	6V	6V
Current - Hold (Ih) (Max)	500 mA	500 mA
Current - Trip (It)	1 A	1 A
Current - Max	100 A	100 A
Time to Trip	100 ms	100 ms
Resistance - Initial (Ri) (Min)	150 mOhms	150 mOhms
Resistance - Post Trip (R1) (Max)	800 mOhms	800 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Ratings	AEC-Q200	AEC-Q200
Mounting Type	Surface Mount	Surface Mount
Package / Case	0805 (2012 Metric), Concave	0805 (2012 Metric), Concave
Size / Dimension	0.083" L x 0.055" W (2.10mm x 1.40mm)	0.083" L x 0.055" W (2.10mm x 1.40mm)
Thickness (Max)	0.037" (0.93mm)	0.037" (0.93mm)
Product Status	Active	Active

Engineering Selection Recommendations

Both PICOASMDC050S-2 and RF5053-000 are active products manufactured by Littelfuse Inc. and carry identical electrical, mechanical, and compliance specifications. Both components are qualified to AEC-Q200 automotive standards and are suitable for applications requiring polymeric PTC resettable fuse protection in 6V circuits with 500 mA hold current ratings.

Selection between these parts is based on inventory availability and supply chain considerations. The PICOASMDC050S-2 maintains 3908 units in stock, while RF5053-000 maintains 1127 units in stock. Both parts are packaged in Tape & Reel format and are classified as Moisture Sensitivity Level 1 (Unlimited).

For applications requiring AEC-Q200 compliance and surface mount 0805 form factor compatibility, either part provides equivalent performance and interchangeability.

Frequently Asked Questions (FAQ)

Q: Can RF5053-000 be used as a direct replacement for PICOASMDC050S-2?

A: Yes. Both parts are manufactured by Littelfuse Inc., carry identical electrical specifications (6V maximum voltage, 500 mA hold current, 1 A trip current), and share the same 0805 (2012 Metric) surface mount package with concave geometry. All mechanical dimensions and compliance ratings are equivalent.

Q: What are the critical parameters that determine substitution eligibility?

A: Substitution is determined by equivalence in voltage rating (6V), hold current (500 mA), trip current (1 A), operating temperature range (-40°C to 85°C), package type (0805 Concave), and AEC-Q200 compliance. Deviation in any of these parameters disqualifies a part from direct substitution.

Q: Are there differences in initial or post-trip resistance between these parts?

A: No. Both PICOASMDC050S-2 and RF5053-000 specify identical initial resistance (150 mOhms minimum) and post-trip resistance (800 mOhms maximum).

Q: What is the time-to-trip specification for these components?

A: Both parts have a time-to-trip specification of 100 milliseconds, indicating the response time from overcurrent detection to device activation.

Q: Are these parts suitable for automotive applications?

A: Yes. Both components carry AEC-Q200 automotive qualification, indicating compliance with automotive industry reliability and quality standards.

Q: What is the moisture sensitivity level for these parts?

A: Both PICOASMDC050S-2 and RF5053-000 are classified as Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Can these parts be used in applications exceeding 6V?

A: No. The maximum voltage rating for both parts is 6V. Application in circuits exceeding this voltage rating will result in device failure and loss of overcurrent protection function.

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