TPSMD12A Equivalent & Substitute Parts

Part Overview

The TPSMD12A is a unidirectional 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 12V reverse standoff voltage and 19.9V maximum clamping voltage. The part is actively produced and widely used in electronic circuits requiring surge and ESD protection. Equivalent parts are identified when identical electrical performance and mechanical compatibility are required for procurement flexibility, inventory management, or supply chain continuity.

Substiute Parts

TPSMD12A

Littelfuse Inc.In Stock: 6458TPSMD12A Datasheet

Current PartRFQ

SMDJ12A

Alpha & Omega Semiconductor Inc.In Stock: 10413SMDJ12A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Equivalent substitution for the TPSMD12A is determined by matching the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 12V (Typ)
• Voltage - Clamping (Max) @ Ipp: 19.9V
• Current - Peak Pulse (10/1000µs): 150.8A
• Power - Peak Pulse: 3000W
• Package / Case: DO-214AB, SMC
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Type: Zener

The SMDJ12A from Alpha & Omega Semiconductor Inc. meets all specified electrical parameters and mechanical requirements, making it a direct functional equivalent for the TPSMD12A in surface mount TVS diode applications.

Parameter Comparison

*The SMDJ12A has a minimum operating temperature of -55°C versus -65°C for the TPSMD12A. Applications requiring operation below -55°C must use the TPSMD12A.

Engineering Selection Recommendations

Both the TPSMD12A and SMDJ12A are active production components with identical electrical specifications and mechanical compatibility. Selection between these parts should be based on:

• Supply chain availability and lead time requirements
• Inventory levels at authorized distributors
• Compliance certifications: Both parts are ROHS3 compliant and REACH unaffected
• Operating temperature range: The TPSMD12A supports -65°C minimum; the SMDJ12A supports -55°C minimum
• Application-specific temperature requirements must be evaluated against the lower limit of -55°C for the SMDJ12A

Both components are suitable for general purpose transient voltage suppression in surface mount applications where the specified electrical and thermal parameters are met.

Frequently Asked Questions (FAQ)

Q: Can SMDJ12A replace TPSMD12A in all applications?

A: The SMDJ12A is electrically and mechanically equivalent for applications operating within -55°C to 150°C. Applications requiring operation below -55°C must use the TPSMD12A, which supports -65°C minimum.

Q: Are the packages identical?

A: Yes. Both parts use the DO-214AB (SMC) surface mount package with identical pinout and footprint compatibility.

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

A: Voltage ratings (12V standoff, 19.9V clamping), peak pulse current (150.8A), power dissipation (3000W), package type (DO-214AB), and unidirectional channel configuration (1 channel) must match exactly.

Q: Do both parts meet automotive and compliance standards?

A: The TPSMD12A carries AEC-Q101 automotive qualification. Both parts are ROHS3 compliant and REACH unaffected, with EAR99 export classification.

Q: What is the difference in operating temperature range?

A: TPSMD12A operates from -65°C to 150°C; SMDJ12A operates from -55°C to 150°C. The TPSMD12A provides extended low-temperature capability.