SMP20-M3/84A Equivalent & Substitute Parts

Part Overview

The SMP20-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 20V reverse standoff voltage with a 35.8V maximum clamping voltage and 11.2A peak pulse current capability in a surface-mount DO-220AA package.

The SMP20-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)	20	V
Voltage - Breakdown (Min)	22.2	V
Voltage - Clamping (Max) @ Ipp	35.8	V
Current - Peak Pulse (10/1000µs)	11.2	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-220AA	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SMP20-M3/84A is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 20V
Voltage - Breakdown (Min): Must be 22.2V
Package / Case: Must be DO-220AA
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must support -55°C to 150°C (TJ)
RoHS Status: Must maintain ROHS3 Compliance

Substitute parts are grouped based on their ability to meet these electrical and mechanical specifications. Variations in clamping voltage and peak pulse current are permissible within the defined parameter ranges, provided all other critical specifications remain equivalent.

Parameter Comparison

Parameter	SMP20-M3/84A (Main)	SMP20-M3/85A	SMP20A-M3/84A
Voltage - Reverse Standoff (Typ)	20V	20V	20V
Voltage - Breakdown (Min)	22.2V	22.2V	22.2V
Voltage - Clamping (Max) @ Ipp	35.8V	35.8V	32.4V
Current - Peak Pulse (10/1000µs)	11.2A	11.2A	12.3A
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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

SMP20-M3/85A is a direct substitute for the SMP20-M3/84A. Both parts share identical electrical specifications and package configuration. The SMP20-M3/85A maintains active product status with Vishay General Semiconductor - Diodes Division, ensuring ongoing availability and supply chain support. This part is recommended as the primary replacement for obsolete SMP20-M3/84A applications.

SMP20A-M3/84A is an alternative substitute with compatible electrical and mechanical specifications. This part features a lower maximum clamping voltage (32.4V versus 35.8V) and higher peak pulse current (12.3A versus 11.2A) while maintaining the same 20V reverse standoff voltage and DO-220AA package. The SMP20A-M3/84A is supplied in Tape & Reel packaging and maintains active product status. This part is suitable for applications where the reduced clamping voltage and increased current capability are compatible with circuit requirements.

Both substitute parts maintain ROHS3 compliance, identical operating temperature ranges, and equivalent power dissipation ratings. Selection between SMP20-M3/85A and SMP20A-M3/84A should be based on specific circuit clamping voltage and current requirements.

Frequently Asked Questions (FAQ)

Q: Can SMP20-M3/85A be used as a direct replacement for SMP20-M3/84A?

A: Yes. The SMP20-M3/85A is electrically and mechanically identical to the SMP20-M3/84A. Both parts feature 20V reverse standoff voltage, 35.8V maximum clamping voltage, 11.2A peak pulse current, and DO-220AA surface-mount packaging. The primary difference is product status: SMP20-M3/85A is active while SMP20-M3/84A is obsolete.

Q: What are the differences between SMP20-M3/85A and SMP20A-M3/84A?

A: Both parts maintain the same 20V reverse standoff voltage and DO-220AA package. The SMP20A-M3/84A has a lower maximum clamping voltage (32.4V versus 35.8V) and higher peak pulse current (12.3A versus 11.2A). Selection depends on whether your circuit requires the specific clamping voltage and current characteristics of each part.

Q: Are packaging options different between substitute parts?

A: The SMP20-M3/84A and SMP20-M3/85A do not specify packaging format in the provided data. The SMP20A-M3/84A is supplied in Tape & Reel (TR) packaging. Verify packaging requirements for your assembly process before selection.

Q: Do all substitute parts maintain the same compliance certifications?

A: Yes. All parts listed—SMP20-M3/84A, SMP20-M3/85A, and SMP20A-M3/84A—are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. All parts support the same operating temperature range of -55°C to 150°C (TJ).

Q: Which substitute part should I select for new designs?

A: For new designs requiring specifications identical to the original SMP20-M3/84A, use SMP20-M3/85A. This part is active and provides exact electrical and mechanical equivalence. If your circuit can accommodate the SMP20A-M3/84A specifications (lower clamping voltage, higher current capability), this part offers higher inventory availability.

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