SMP22-E3/85A Equivalent & Substitute Parts

Part Overview

The SMP22-E3/85A is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for general-purpose transient protection applications. This component features a 22V reverse standoff voltage with a 39.4V maximum clamping voltage and 10.2A peak pulse current capability in a DO-220AA surface mount package. The SMP22-E3/85A is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	24.4	V
Voltage - Clamping (Max) @ Ipp	39.4	V
Current - Peak Pulse (10/1000µs)	10.2	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-220AA	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SMP22-E3/85A are identified based on the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: Reverse standoff voltage and clamping voltage must fall within acceptable tolerance ranges for the protected circuit
Current Handling: Peak pulse current capability must meet or exceed the application requirement
Power Dissipation: Peak pulse power rating must support the transient energy absorption
Package Compatibility: Surface mount package type determines PCB layout and assembly compatibility
Temperature Range: Operating temperature specification must cover the application environment
Compliance Standards: RoHS and REACH compliance status for regulatory requirements

Two substitute parts are identified: SMP22-M3/85A (direct manufacturer equivalent) and PTVS24VS1UR,115 (manufacturer-recommended alternative with different package).

Parameter Comparison

Parameter	SMP22-E3/85A	SMP22-M3/85A	PTVS24VS1UR,115
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Nexperia USA Inc.
Product Status	Obsolete	Active	Active
Voltage - Reverse Standoff (Typ)	22V	22V	24V
Voltage - Breakdown (Min)	24.4V	24.4V	26.7V
Voltage - Clamping (Max) @ Ipp	39.4V	39.4V	38.9V
Current - Peak Pulse (10/1000µs)	10.2A	10.2A	10.3A
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TA)
Package / Case	DO-220AA	DO-220AA	SOD-123W
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SMP22-M3/85A is the primary substitute for the obsolete SMP22-E3/85A. This part maintains identical electrical specifications and package format while offering active product status from the same manufacturer. The transition from E3 to M3 variant represents a standard product line update with no functional differences. This substitute requires no design modifications and provides direct compatibility.

PTVS24VS1UR,115 serves as an alternative substitute when package constraints permit. This Nexperia component offers comparable electrical performance with a 2V higher reverse standoff voltage (24V vs. 22V) and slightly higher peak pulse current (10.3A vs. 10.2A). The SOD-123W package is smaller than DO-220AA, enabling space optimization in new designs. This part includes AEC-Q101 automotive qualification, providing enhanced reliability documentation for applications requiring automotive-grade components. The higher voltage rating requires circuit validation to confirm compatibility with the protected circuit's voltage thresholds.

Frequently Asked Questions (FAQ)

Q: Can SMP22-M3/85A be used as a direct replacement for SMP22-E3/85A?

A: Yes. The SMP22-M3/85A is a direct substitute with identical electrical parameters and package format. No design changes are required.

Q: What is the key difference between SMP22-M3/85A and PTVS24VS1UR,115?

A: The primary differences are manufacturer (Vishay vs. Nexperia), package type (DO-220AA vs. SOD-123W), and voltage rating (22V vs. 24V standoff). Electrical performance is comparable, but the higher voltage rating of the PTVS24VS1UR,115 requires circuit validation.

Q: Is the PTVS24VS1UR,115 suitable for all applications using the SMP22-E3/85A?

A: The PTVS24VS1UR,115 is electrically compatible for most general-purpose transient protection applications. However, the 2V higher reverse standoff voltage may affect clamping behavior in circuits with tight voltage margins. Circuit analysis is necessary to confirm suitability.

Q: Does package change from DO-220AA to SOD-123W affect PCB assembly?

A: Yes. The SOD-123W package is significantly smaller than DO-220AA, requiring PCB layout modifications and different assembly tooling. Footprint redesign is necessary for PTVS24VS1UR,115 implementation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both SMP22-M3/85A and PTVS24VS1UR,115 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's compliance status.

Q: What is the inventory status of these substitutes?

A: SMP22-M3/85A has 725 pieces in stock. PTVS24VS1UR,115 has 18,660 pieces in stock, providing greater availability for high-volume procurement.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message