Equivalent & Substitute Parts for SMD1210P005TSA

Part Overview

The SMD1210P005TSA is a Polymeric PTC Resettable Fuse manufactured by Littelfuse, rated for 30V at 50 mA hold current in a 1210 (3225 Metric) surface mount package. This component is classified as Obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The part operates across a temperature range of -40°C to 85°C and is approved by cURus and TUV agencies. Due to its obsolete status, direct substitutes with active product availability are required for new designs and manufacturing operations.

Substiute Parts

SMD1210P005TSA

LittelfuseIn Stock: 1135SMD1210P005TSA Datasheet

Current PartRFQ

1210L005WR

LittelfuseIn Stock: 2756501210L005WR Datasheet

DirectRFQ

MICROSMD005F-2

Littelfuse Inc.In Stock: 38191MICROSMD005F-2 Datasheet

MFR RecommendedRFQ

MICROSMD010F-2

Littelfuse Inc.In Stock: 29520MICROSMD010F-2 Datasheet

MFR RecommendedRFQ

MINISMDC020F-2

Littelfuse Inc.In Stock: 39213MINISMDC020F-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMD1210P005TSA is determined by the following critical parameters:

• Voltage Rating: Maximum voltage must be 30V or greater
• Current - Hold (Ih): Must match 50 mA specification
• Current - Trip (It): Must match 150 mA specification
• Resistance - Initial (Ri): Must match 3.6 Ohms minimum
• Resistance - Post Trip (R1): Must match 50 Ohms maximum
• Operating Temperature Range: Must support -40°C to 85°C
• Mounting Type: Surface Mount required
• Package / Case: 1210 (3225 Metric) form factor required for direct PCB compatibility

Substitute parts are grouped into two categories:

Direct Electrical and Mechanical Equivalents (identical electrical specifications and 1210 package):

• 1210L005WR (Littelfuse, Active status, ROHS3 Compliant)
• MICROSMD005F-2 (Littelfuse, Active status, ROHS3 Compliant)

Functional Alternatives (different current ratings or package sizes, requiring circuit evaluation):

• MICROSMD010F-2 (100 mA hold current, 1210 package)
• MINISMDC020F-2 (200 mA hold current, 1812 package)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

1210L005WR is the primary direct substitute. It maintains all electrical specifications of the SMD1210P005TSA (50 mA hold current, 150 mA trip current, 3.6 Ohms initial resistance, 50 Ohms post-trip resistance) while offering Active product status and ROHS3 compliance. Inventory availability is significantly higher (275,616 pcs) compared to the obsolete original part. Packaging is Cut Tape and Digi-Reel format.

MICROSMD005F-2 is an alternative direct electrical equivalent from the PolySwitch microSMD series, also maintaining 50 mA hold current and 150 mA trip specifications. This part offers expanded approval certifications (CSA, TUV, UL) and Active status. Thickness is reduced to 0.033" (0.85mm) compared to the original 0.039" (1.00mm), which may require PCB layout verification for clearance. Inventory is 38,153 pcs.

For Functional Alternatives (Circuit Re-evaluation Required):

MICROSMD010F-2 doubles the hold current to 100 mA and trip current to 250 mA while maintaining the 1210 package footprint. This part is suitable only if the circuit design permits higher current thresholds. Initial resistance is lower at 2.1 Ohms, and post-trip resistance is 15 Ohms. Trip time is faster at 1 second.

MINISMDC020F-2 is a higher-current alternative (200 mA hold, 400 mA trip) in a larger 1812 package. This requires PCB redesign and is applicable only when circuit specifications allow increased current ratings and package size changes.

Compliance Considerations:

The original SMD1210P005TSA is RoHS non-compliant. All active substitutes (1210L005WR, MICROSMD005F-2, MICROSMD010F-2, MINISMDC020F-2) are ROHS3 compliant, meeting current environmental regulations. All substitutes maintain TUV approval; MICROSMD005F-2, MICROSMD010F-2, and MINISMDC020F-2 add CSA and UL certifications.

Frequently Asked Questions (FAQ)

Q: Can 1210L005WR be used as a direct drop-in replacement for SMD1210P005TSA?

A: Yes. 1210L005WR is electrically and mechanically identical to SMD1210P005TSA. Both maintain 50 mA hold current, 150 mA trip current, 3.6 Ohms initial resistance, and 50 Ohms post-trip resistance in the same 1210 (3225 Metric) package. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between MICROSMD005F-2 and 1210L005WR?

A: Both parts are electrically equivalent with identical current and resistance specifications. The key differences are: MICROSMD005F-2 has a thinner profile (0.033" vs. 0.049"), expanded certifications (CSA, TUV, UL vs. cURus, TUV), and MSL rating of 2A (4 Weeks) vs. 1 (Unlimited). PCB clearance must be verified for the thinner MICROSMD005F-2 if space constraints exist.

Q: Can MICROSMD010F-2 replace SMD1210P005TSA?

A: MICROSMD010F-2 is not a direct replacement. It has double the hold current (100 mA vs. 50 mA) and trip current (250 mA vs. 150 mA). Use only if circuit design specifications permit higher current thresholds. Initial and post-trip resistance values also differ (2.1 Ohms initial, 15 Ohms post-trip vs. 3.6 Ohms initial, 50 Ohms post-trip).

Q: Why is MINISMDC020F-2 listed as a substitute if it uses a different package?

A: MINISMDC020F-2 is a functional alternative for applications requiring higher current protection (200 mA hold, 400 mA trip). The 1812 package is larger than the 1210 package, requiring PCB redesign. This part is suitable only when circuit specifications allow both the increased current rating and package size change.

Q: What is the impact of MSL rating differences?

A: SMD1210P005TSA and 1210L005WR have MSL 1 (Unlimited shelf life). MICROSMD005F-2, MICROSMD010F-2, and MINISMDC020F-2 have MSL 2A (4 Weeks), requiring controlled storage conditions and bake-out procedures before reflow soldering if shelf time exceeds 4 weeks.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (1210L005WR, MICROSMD005F-2, MICROSMD010F-2, MINISMDC020F-2) are ROHS3 compliant. The original SMD1210P005TSA is RoHS non-compliant.

Q: Which substitute has the best availability?

A: 1210L005WR has the highest inventory at 275,616 pcs. MINISMDC020F-2 has 39,200 pcs, MICROSMD010F-2 has 29,431 pcs, and MICROSMD005F-2 has 38,153 pcs.