TPSMC68A Equivalent & Substitute Parts

Part Overview

The TPSMC68A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AB package. This component provides transient overvoltage protection with a 58.1V reverse standoff voltage and 92V maximum clamping voltage at peak pulse current. The part is actively produced, AEC-Q101 qualified for automotive applications, and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter range.

Substiute Parts

TPSMC68A

Littelfuse Inc.In Stock: 2538TPSMC68A Datasheet

Current PartRFQ

1.5SMC68A

Taiwan Semiconductor CorporationIn Stock: 121441.5SMC68A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 1.5SMC68A qualifies as a direct substitute for the TPSMC68A based on the following critical parameters:

Voltage specifications are identical: 58.1V reverse standoff, 64.6V minimum breakdown, and 92V maximum clamping voltage. Both devices operate across the same temperature range (-55°C to 150°C). The mechanical interface is equivalent, with both parts housed in the DO-214AB surface mount package. Peak pulse current differs marginally (17A versus 16.5A), representing a 3% increase in current handling capacity. Power dissipation remains constant at 1500W peak pulse. Both parts are unidirectional Zener diodes with a single channel configuration.

Parameter Comparison

Engineering Selection Recommendations

Both the TPSMC68A and 1.5SMC68A are active production components with ROHS3 compliance. The TPSMC68A carries AEC-Q101 automotive qualification, while the 1.5SMC68A is specified for telecom applications. Selection between these parts depends on application requirements: the TPSMC68A is appropriate for automotive-grade implementations requiring AEC-Q101 certification, while the 1.5SMC68A serves general industrial and telecom protection circuits. The 1.5SMC68A provides marginally higher peak pulse current capacity (17A versus 16.5A) within the same power envelope, making it suitable for applications with slightly elevated transient stress. Both parts maintain identical voltage clamping characteristics and thermal operating range, ensuring functional interchangeability in circuits where automotive qualification is not mandated.

Frequently Asked Questions (FAQ)

Q: Can the 1.5SMC68A replace the TPSMC68A in automotive applications?

A: The 1.5SMC68A is electrically compatible but lacks AEC-Q101 automotive qualification. Use the 1.5SMC68A only in non-automotive circuits or where automotive certification is not required by design specifications.

Q: What is the significance of the 0.5A difference in peak pulse current?

A: The 1.5SMC68A is rated for 17A peak pulse current compared to the TPSMC68A at 16.5A. This 3% increase provides additional margin in transient protection circuits but does not alter the clamping voltage or thermal characteristics. Both devices dissipate identical peak pulse power (1500W).

Q: Are the packages physically identical?

A: Yes. Both the TPSMC68A and 1.5SMC68A use the DO-214AB surface mount package (SMC variant). PCB footprints and reflow soldering profiles are identical.

Q: Do these parts have different moisture sensitivity levels?

A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: What compliance differences exist between these parts?

A: The TPSMC68A is REACH Affected and AEC-Q101 qualified. The 1.5SMC68A is REACH Unaffected. Both are ROHS3 compliant. Verify REACH compliance requirements for your specific application region.

Q: Can these parts be used interchangeably in circuit design?

A: Yes, provided automotive qualification is not a design requirement. Electrical performance, thermal range, and mechanical interface are equivalent. Verify compliance certifications against your application specifications before substitution.