SMP22-M3/84A Equivalent & Substitute Parts

Part Overview

The SMP22-M3/84A 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 surface-mount DO-220AA package.

The SMP22-M3/84A is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this TVS diode specification.

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 (TJ)
Package / Case	DO-220AA	-
Mounting Type	Surface Mount	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitute parts for the SMP22-M3/84A are identified based on strict electrical and mechanical parameter compatibility within the TVS diode category. The substitution logic is based on the following critical parameters:

Primary Matching Criteria:

Reverse Standoff Voltage: 22V (Typ)
Breakdown Voltage (Min): 24.4V
Package / Case: DO-220AA (Surface Mount)
Mounting Type: Surface Mount
Unidirectional Channels: 1
Operating Temperature Range: -55°C to 150°C (TJ)
Series: TransZorb®, eSMP®

Secondary Compatibility Parameters:

Clamping Voltage (Max) @ Ipp: 39.4V or lower
Peak Pulse Current: 10.2A or higher
Peak Pulse Power: 400W

Substitute parts must maintain identical or superior electrical performance within the specified voltage and current ratings while preserving mechanical compatibility with the DO-220AA package footprint.

Parameter Comparison

Parameter	SMP22-M3/84A (Main)	SMP22-M3/85A	SMP22A-M3/84A
Voltage - Reverse Standoff (Typ)	22V	22V	22V
Voltage - Breakdown (Min)	24.4V	24.4V	24.4V
Voltage - Clamping (Max) @ Ipp	39.4V	39.4V	35.5V
Current - Peak Pulse (10/1000µs)	10.2A	10.2A	11.3A
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)
Package / Case	DO-220AA	DO-220AA	DO-220AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener
Unidirectional Channels	1	1	1
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SMP22-M3/85A is a direct functional equivalent to the SMP22-M3/84A. Both parts maintain identical electrical specifications across all critical parameters: 22V reverse standoff voltage, 24.4V minimum breakdown voltage, 39.4V maximum clamping voltage, and 10.2A peak pulse current. The SMP22-M3/85A is currently in active product status, ensuring ongoing availability and supply chain support. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating.

SMP22A-M3/84A provides an alternative with enhanced performance characteristics. This part maintains the same 22V reverse standoff and 24.4V breakdown voltages but offers a lower maximum clamping voltage of 35.5V and higher peak pulse current of 11.3A compared to the main part. The SMP22A-M3/84A is supplied in Tape & Reel packaging and is currently in active product status. This part is suitable for applications where lower clamping voltage and higher current handling are beneficial. Compliance certifications (ROHS3, REACH, MSL 1) are identical to the main part.

Both substitute parts are manufactured by Vishay General Semiconductor - Diodes Division within the TransZorb® and eSMP® series, ensuring design consistency and manufacturing quality standards.

Frequently Asked Questions (FAQ)

Q: Can SMP22-M3/85A be used as a direct replacement for SMP22-M3/84A?

A: Yes. The SMP22-M3/85A is a direct equivalent with identical electrical specifications. Both parts feature 22V reverse standoff voltage, 39.4V maximum clamping voltage, and 10.2A peak pulse current. The primary advantage of SMP22-M3/85A is its active product status, ensuring continued availability.

Q: What is the difference between SMP22-M3/84A and SMP22A-M3/84A?

A: The SMP22A-M3/84A offers enhanced performance with a lower maximum clamping voltage (35.5V versus 39.4V) and higher peak pulse current (11.3A versus 10.2A). Both maintain the same 22V reverse standoff voltage. The SMP22A-M3/84A is supplied in Tape & Reel packaging. Selection depends on whether the application benefits from lower clamping voltage and higher current capability.

Q: Are all substitute parts compatible with the DO-220AA package footprint?

A: Yes. All listed substitute parts use the DO-220AA surface-mount package, ensuring mechanical and footprint compatibility with designs originally specified for the SMP22-M3/84A.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. Both SMP22-M3/85A and SMP22A-M3/84A are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the main part.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across the same temperature range: -55°C to 150°C (TJ), providing thermal compatibility with the original SMP22-M3/84A specification.

Q: Why is the SMP22-M3/84A listed as obsolete?

A: The SMP22-M3/84A is classified as obsolete by the manufacturer. The active substitute parts SMP22-M3/85A and SMP22A-M3/84A are recommended for new designs and ongoing production to ensure supply chain continuity.

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