MICROSMD005-2 Equivalent & Substitute Parts

Part Overview

The MICROSMD005-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® microSMD series. This component provides overcurrent protection in surface mount applications with a 30V maximum voltage rating and 50 mA hold current specification. The part is currently listed as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	50 mA
Current - Trip (It)	150 mA
Current - Max	10 A
Time to Trip	1.5 s
Resistance - Initial (Ri) (Min)	3.6 Ohms
Resistance - Post Trip (R1) (Max)	50 Ohms
Operating Temperature	-40°C ~ 85°C
Package / Case	1210 (3225 Metric), Concave
Mounting Type	Surface Mount
Type	Polymeric

Substitute Part Grouping Explanation

Substitution eligibility for the MICROSMD005-2 is determined by strict equivalence across the following critical parameters:

Voltage rating: 30V maximum
Current hold specification: 50 mA maximum
Current trip specification: 150 mA
Maximum current capacity: 10 A
Time to trip: 1.5 s
Initial resistance: 3.6 Ohms minimum
Post-trip resistance: 50 Ohms maximum
Package type: 1210 (3225 Metric), Concave surface mount
Operating temperature range: -40°C to 85°C
Component type: Polymeric PTC resettable fuse

The MICROSMD005F-2 meets all electrical and mechanical specifications required for direct substitution. Packaging format differences (Tape & Reel versus Cut Tape & Digi-Reel®) do not affect functional compatibility.

Parameter Comparison

Parameter	MICROSMD005-2	MICROSMD005F-2	Match
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Yes
Series	PolySwitch® microSMD	PolySwitch® microSMD	Yes
Type	Polymeric	Polymeric	Yes
Voltage - Max	30V	30V	Yes
Current - Hold (Ih) (Max)	50 mA	50 mA	Yes
Current - Trip (It)	150 mA	150 mA	Yes
Current - Max	10 A	10 A	Yes
Time to Trip	1.5 s	1.5 s	Yes
Resistance - Initial (Ri) (Min)	3.6 Ohms	3.6 Ohms	Yes
Resistance - Post Trip (R1) (Max)	50 Ohms	50 Ohms	Yes
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Yes
Package / Case	1210 (3225 Metric), Concave	1210 (3225 Metric), Concave	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Size / Dimension	0.127" L x 0.102" W (3.22mm x 2.58mm)	0.127" L x 0.102" W (3.22mm x 2.58mm)	Yes
Thickness (Max)	0.033" (0.85mm)	0.033" (0.85mm)	Yes
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	Yes
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes
ECCN	EAR99	EAR99	Yes
HTSUS	8533.40.8070	8533.40.8070	Yes
Product Status	Obsolete	Active	Differs
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Differs
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Differs

Engineering Selection Recommendations

The MICROSMD005F-2 is the direct functional equivalent for the obsolete MICROSMD005-2. All electrical characteristics, mechanical dimensions, and thermal specifications are identical. Both components carry identical regulatory approvals from CSA, TUV, and UL.

The primary distinction between these parts is product status and compliance posture. The MICROSMD005-2 is Obsolete and RoHS non-compliant, while the MICROSMD005F-2 is Active and ROHS3 Compliant. For new designs or ongoing production requiring regulatory compliance with current environmental standards, the MICROSMD005F-2 is the appropriate selection. The packaging format difference (Tape & Reel versus Cut Tape & Digi-Reel®) reflects standard industry variations and does not affect functional performance or PCB assembly compatibility.

Frequently Asked Questions (FAQ)

Q: Can MICROSMD005F-2 be used as a direct replacement for MICROSMD005-2 in existing designs?

A: Yes. The MICROSMD005F-2 provides identical electrical performance, thermal characteristics, and mechanical fit. All critical parameters including voltage rating, current specifications, resistance values, and operating temperature range are equivalent. The components are pin-compatible and footprint-compatible for surface mount assembly.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging?

A: These are packaging and delivery format variations only. Tape & Reel (TR) provides components on continuous carrier tape in reel format for automated assembly lines. Cut Tape (CT) & Digi-Reel® provides the same components in cut tape segments or alternative reel formats. The actual component specifications and performance are identical regardless of packaging format.

Q: Why does MICROSMD005F-2 have ROHS3 compliance while MICROSMD005-2 does not?

A: The MICROSMD005-2 is listed as Obsolete, reflecting an older manufacturing status prior to current RoHS3 regulatory requirements. The MICROSMD005F-2 is an Active product manufactured to current environmental compliance standards. Both components are functionally equivalent; the compliance difference reflects manufacturing timeline and regulatory evolution.

Q: Are there any thermal or electrical performance differences between these parts?

A: No. Both components operate across the identical temperature range (-40°C to 85°C), maintain the same initial resistance (3.6 Ohms minimum), post-trip resistance (50 Ohms maximum), and all current specifications. Thermal and electrical behavior is equivalent.

Q: What certifications apply to both parts?

A: Both MICROSMD005-2 and MICROSMD005F-2 carry approvals from CSA, TUV, and UL. Both are classified under ECCN EAR99 and HTSUS 8533.40.8070. Regulatory classification is identical.

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