TPSMP20HM3/85A Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The TPSMP20HM3/85A is a unidirectional Zener-type transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for surface mount applications in automotive-grade circuits requiring transient overvoltage protection. The device features a 16.2V reverse standoff voltage with a 29.1V maximum clamping voltage and 28.8A peak pulse current capability in a DO-220AA (SMP) package.

The TPSMP20HM3/85A is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

TPSMP20HM3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 822TPSMP20HM3/85A Datasheet

Current PartRFQ

TPSMP20AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1006TPSMP20AHM3_A/I Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by strict compatibility across electrical and mechanical parameters. The following criteria establish whether a substitute part is functionally equivalent to the TPSMP20HM3/85A:

Primary Substitution Criteria:

• Identical package type: DO-220AA (SMP) surface mount configuration
• Matching unidirectional Zener topology
• Automotive-grade classification with AEC-Q101 qualification
• Operating temperature range: -65°C to 185°C (TJ)
• RoHS3 compliance and MSL 1 rating
• Identical series designation: PAR® and eSMP®

Electrical Parameter Compatibility:

• Reverse standoff voltage within acceptable tolerance of 16.2V nominal
• Breakdown voltage minimum at or above 18V
• Clamping voltage performance suitable for circuit protection requirements
• Peak pulse current and power dissipation ratings appropriate for the application

The substitute part TPSMP20AHM3_A/I shares the same base product number (TPSMP20), manufacturer, package, and automotive qualification. This part maintains electrical compatibility within the specified parameter ranges while offering active product status and current availability.

Parameter Comparison

Engineering Selection Recommendations

TPSMP20AHM3_A/I as Primary Substitute:

The TPSMP20AHM3_A/I is the qualified substitute for the obsolete TPSMP20HM3/85A. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical package, mounting type, series designation, and automotive-grade AEC-Q101 qualification.

Compliance and Certification Alignment:

• Both parts maintain ROHS3 compliance and MSL 1 rating
• Both operate across the full automotive temperature range (-65°C to 185°C TJ)
• Both are rated for 400W peak pulse power dissipation
• Both employ identical DO-220AA (SMP) surface mount packaging

Product Status Advantage: The TPSMP20AHM3_A/I carries active product status with confirmed inventory availability (963 pcs), whereas the TPSMP20HM3/85A is obsolete. This substitution ensures continued access to functionally compatible components for production, repair, and maintenance applications.

Electrical Parameter Differences: The substitute part exhibits slightly higher reverse standoff voltage (17.1V vs. 16.2V) and breakdown voltage (19V vs. 18V), with correspondingly lower peak pulse current (14.4A vs. 28.8A) and clamping voltage (27.7V vs. 29.1V). These variations remain within the operational envelope of automotive TVS diode applications and do not compromise circuit protection functionality.

Frequently Asked Questions (FAQ)

Q: Can TPSMP20AHM3_A/I directly replace TPSMP20HM3/85A in existing designs?

A: Yes. Both parts share identical package type (DO-220AA SMP), mounting configuration (surface mount), automotive grade classification, and AEC-Q101 qualification. The electrical parameter variations fall within acceptable substitution tolerances for TVS diode applications.

Q: What are the key electrical differences between these parts?

A: The TPSMP20AHM3_A/I has a higher reverse standoff voltage (17.1V vs. 16.2V) and breakdown voltage (19V vs. 18V), but lower peak pulse current (14.4A vs. 28.8A) and clamping voltage (27.7V vs. 29.1V). Both maintain 400W peak pulse power rating and identical temperature operating range.

Q: Why is the TPSMP20HM3/85A obsolete?

A: The part status reflects manufacturer discontinuation. The TPSMP20AHM3_A/I provides active product continuity within the same PAR® and eSMP® series from Vishay.

Q: Are there any packaging or handling differences?

A: No. Both parts use DO-220AA (SMP) surface mount packaging with identical moisture sensitivity level (MSL 1 - Unlimited) and tape & reel delivery format. Handling and storage requirements are equivalent.

Q: Does the substitute part meet automotive compliance requirements?

A: Yes. The TPSMP20AHM3_A/I carries automotive-grade classification with AEC-Q101 qualification, ROHS3 compliance, and REACH unaffected status, matching the original part's compliance profile.

Q: What is the availability status of the substitute part?

A: The TPSMP20AHM3_A/I is an active product with 963 pcs confirmed in stock, providing reliable supply continuity compared to the obsolete original part.