PICOASMDC020S-2 Equivalent & Substitute Parts

Part Overview

The PICOASMDC020S-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. as part of the PolySwitch® picoASMDC series. This surface mount component is designed for overcurrent protection in 9V applications with a 200 mA hold current rating. The device is classified as Active product status and carries AEC-Q200 automotive qualification. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same package and performance specifications.

Key Parameters

Parameter	Value
Voltage - Max	9V
Current - Hold (Ih) (Max)	200 mA
Current - Trip (It)	470 mA
Current - Max	100 A
Time to Trip	100 ms
Resistance - Initial (Ri) (Min)	750 mOhms
Resistance - Post Trip (R1) (Max)	3.2 Ohms
Operating Temperature	-40°C ~ 85°C
Package / Case	0805 (2012 Metric), Concave
Mounting Type	Surface Mount
Type	Polymeric
Series	PolySwitch® picoASMDC
Ratings	AEC-Q200

Substitute Part Grouping Explanation

Substitute parts for the PICOASMDC020S-2 are qualified based on strict equivalence of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage rating: 9V maximum
Current hold specification: 200 mA maximum
Current trip specification: 470 mA
Package configuration: 0805 (2012 Metric), Concave surface mount
Operating temperature range: -40°C to 85°C
Polymeric PTC resettable fuse type
AEC-Q200 automotive qualification

Parts meeting all these parameters are classified as parametric equivalents and direct substitutes. Variations in inventory levels, part numbering schemes, or packaging formats do not affect substitution eligibility when electrical and mechanical specifications remain identical.

Parameter Comparison

Parameter	PICOASMDC020S-2	RF5051-000
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Series	PolySwitch® picoASMDC	PolySwitch® picoASMDC
Type	Polymeric	Polymeric
Voltage - Max	9V	9V
Current - Hold (Ih) (Max)	200 mA	200 mA
Current - Trip (It)	470 mA	470 mA
Current - Max	100 A	100 A
Time to Trip	100 ms	100 ms
Resistance - Initial (Ri) (Min)	750 mOhms	750 mOhms
Resistance - Post Trip (R1) (Max)	3.2 Ohms	3.2 Ohms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	0805 (2012 Metric), Concave	0805 (2012 Metric), Concave
Mounting Type	Surface Mount	Surface Mount
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)	0.027" (0.68mm)	0.027" (0.68mm)
Ratings	AEC-Q200	AEC-Q200
Packaging	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8533.40.8070	8533.40.8070

Engineering Selection Recommendations

PICOASMDC020S-2 (Primary Part)

The PICOASMDC020S-2 is the primary reference part with Active product status and 4518 units in current inventory. This part carries full AEC-Q200 automotive qualification and is suitable for all applications requiring 9V, 200 mA hold current polymeric PTC resettable fuse protection in 0805 surface mount configuration.

RF5051-000 (Parametric Equivalent)

The RF5051-000 is a direct parametric equivalent with identical electrical specifications, package dimensions, and AEC-Q200 qualification. This part is manufactured by Littelfuse Inc. within the same PolySwitch® picoASMDC series. Current inventory for RF5051-000 is 1045 units. Selection between PICOASMDC020S-2 and RF5051-000 is determined by availability and supply chain requirements, as both parts satisfy identical performance and compliance criteria.

Both parts are Active status components suitable for automotive and industrial applications requiring polymeric PTC resettable fuse protection with consistent thermal and electrical performance across the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can RF5051-000 be used as a direct replacement for PICOASMDC020S-2?

A: Yes. RF5051-000 meets all electrical and mechanical specifications of PICOASMDC020S-2, including voltage rating, current hold and trip specifications, operating temperature range, package configuration, and AEC-Q200 qualification. Both parts are surface mount 0805 (2012 Metric) polymeric PTC resettable fuses with identical performance characteristics.

Q: Are there any differences in package or mounting between these parts?

A: No. Both PICOASMDC020S-2 and RF5051-000 use identical 0805 (2012 Metric) Concave surface mount packaging with dimensions of 0.083" L x 0.055" W (2.10mm x 1.40mm) and maximum thickness of 0.027" (0.68mm). Both are supplied in Tape & Reel (TR) format.

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

A: Substitution eligibility is determined by equivalence in voltage rating (9V), current hold specification (200 mA), current trip specification (470 mA), package type (0805 Concave), mounting method (surface mount), operating temperature range (-40°C to 85°C), and AEC-Q200 qualification. All substitute parts must maintain these specifications.

Q: Do both parts have the same thermal and electrical performance?

A: Yes. Both PICOASMDC020S-2 and RF5051-000 have identical time to trip (100 ms), initial resistance (750 mOhms minimum), post-trip resistance (3.2 Ohms maximum), and maximum current rating (100 A). Operating temperature range is -40°C to 85°C for both parts.

Q: What is the Moisture Sensitivity Level for these parts?

A: Both PICOASMDC020S-2 and RF5051-000 have Moisture Sensitivity Level (MSL) 1, which indicates Unlimited shelf life under standard storage conditions.

Q: Are these parts suitable for automotive applications?

A: Yes. Both parts carry AEC-Q200 automotive qualification and are classified as Active products suitable for automotive and industrial overcurrent protection applications.

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