TPSMP22HM3/85A Equivalent & Substitute Parts

Part Overview

The TPSMP22HM3/85A is a unidirectional Zener-type Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for transient overvoltage protection in surface mount applications, featuring a 17.8V reverse standoff voltage and 31.9V maximum clamping voltage. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17.8	V
Voltage - Breakdown (Min)	19.8	V
Voltage - Clamping (Max) @ Ipp	31.9	V
Current - Peak Pulse (10/1000µs)	12.5	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 185	°C (TJ)
Package / Case	DO-220AA (SMP)	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the TPSMP22HM3/85A is determined by the following critical electrical and mechanical parameters:

Voltage Rating Class: Reverse standoff voltage (17.8V nominal) and breakdown voltage range (19.8V minimum) define the protection threshold
Clamping Performance: Maximum clamping voltage (31.9V) at peak pulse current establishes the transient suppression capability
Current Handling: Peak pulse current rating (12.5A at 10/1000µs waveform) and power dissipation (400W) determine surge capacity
Package Compatibility: DO-220AA (SMP) surface mount package ensures mechanical and thermal interface compatibility
Automotive Qualification: AEC-Q101 certification and automotive grade classification are mandatory for equivalent substitution
Temperature Operating Range: -65°C to 185°C junction temperature range must be maintained

The substitute part TPSMP22AHM3_A/I belongs to the same PAR® and eSMP® series from Vishay, sharing identical package geometry and automotive qualification, with comparable electrical performance within acceptable engineering tolerances.

Parameter Comparison

Parameter	TPSMP22HM3/85A	TPSMP22AHM3_A/I	Compatibility
Voltage - Reverse Standoff (Typ)	17.8V	18.8V	Within tolerance band
Voltage - Breakdown (Min)	19.8V	20.9V	Within tolerance band
Voltage - Clamping (Max) @ Ipp	31.9V	30.6V	Improved performance
Current - Peak Pulse (10/1000µs)	12.5A	13.1A	Enhanced capability
Power - Peak Pulse	400W	400W	Equivalent
Operating Temperature Range	-65 to 185°C (TJ)	-65 to 185°C (TJ)	Equivalent
Package / Case	DO-220AA (SMP)	DO-220AA (SMP)	Equivalent
Grade	Automotive	Automotive	Equivalent
Qualification	AEC-Q101	AEC-Q101	Equivalent
Type	Zener	Zener	Equivalent
Unidirectional Channels	1	1	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent

Engineering Selection Recommendations

The TPSMP22AHM3_A/I is a direct functional equivalent for the obsolete TPSMP22HM3/85A. Both components maintain identical automotive grade classification and AEC-Q101 qualification status, ensuring compliance with automotive reliability standards. The substitute part demonstrates equivalent or improved electrical performance across all critical parameters: clamping voltage is reduced (30.6V vs. 31.9V), providing superior transient suppression; peak pulse current is increased (13.1A vs. 12.5A), offering enhanced surge handling capability. Both parts share the DO-220AA (SMP) surface mount package, eliminating any PCB layout or thermal management modifications. The TPSMP22AHM3_A/I is currently in active production status with confirmed inventory availability, making it the appropriate selection for design continuation and procurement.

Frequently Asked Questions (FAQ)

Q: Can TPSMP22AHM3_A/I be used as a direct replacement for TPSMP22HM3/85A without circuit modifications?

A: Yes. Both components are unidirectional Zener TVS diodes with identical package geometry (DO-220AA), operating temperature range (-65°C to 185°C), and automotive qualification (AEC-Q101). The electrical parameters are within compatible tolerance bands for transient suppression applications.

Q: What is the significance of the voltage parameter differences between the two parts?

A: The TPSMP22AHM3_A/I exhibits a slightly higher reverse standoff voltage (18.8V vs. 17.8V) and breakdown voltage (20.9V vs. 19.8V), representing normal manufacturing tolerance variation within the same product family. The clamping voltage is lower (30.6V vs. 31.9V), indicating improved transient suppression performance.

Q: Are there packaging differences between these parts?

A: The TPSMP22HM3/85A is supplied in bulk packaging, while TPSMP22AHM3_A/I is supplied in Tape & Reel (TR) format. Both use the identical DO-220AA (SMP) component package. Tape & Reel packaging is standard for automated assembly processes and does not affect electrical or thermal performance.

Q: Does the substitute part maintain automotive compliance?

A: Yes. The TPSMP22AHM3_A/I carries automotive grade classification and AEC-Q101 qualification identical to the original part, ensuring compliance with automotive reliability and qualification requirements.

Q: What is the product status difference, and does it affect substitution validity?

A: The original TPSMP22HM3/85A is classified as obsolete, while TPSMP22AHM3_A/I is in active production. This status difference makes the substitute part the appropriate choice for ongoing procurement and design support, as it ensures long-term availability and supply chain continuity.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message