SMF22A-M3-08 Equivalent & Substitute Parts

Part Overview

The SMF22A-M3-08 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the eSMP® series and provides transient voltage protection with a 22V reverse standoff voltage and 35.5V maximum clamping voltage. The part is Active status and widely used in general purpose applications requiring ESD and transient protection. Substitute parts may be required due to inventory constraints, packaging preferences, or specific application requirements while maintaining equivalent electrical performance.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	24.4	V
Voltage - Clamping (Max) @ Ipp	35.5	V
Current - Peak Pulse (10/1000µs)	5.6	A
Power - Peak Pulse	200	W
Capacitance @ 1MHz	271	pF
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-219AB (SMF)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMF22A-M3-08 are evaluated based on the following critical parameters that determine functional equivalence:

Voltage Parameters: Reverse standoff voltage (22V), breakdown voltage minimum (24.4V), and clamping voltage maximum (35.5V) must match or remain within acceptable tolerance for the application circuit.

Current Rating: Peak pulse current of 5.6A at 10/1000µs pulse width defines the transient energy handling capability.

Power Dissipation: Peak pulse power rating of 200W establishes the maximum transient energy the device can safely dissipate.

Package Compatibility: Surface mount packaging type affects PCB layout and thermal management characteristics.

Compliance & Status: Active product status and ROHS3 compliance ensure ongoing availability and regulatory conformance.

The SMF22A-TP maintains identical electrical specifications (22V standoff, 35.5V clamp, 5.6A peak current, 200W power) with a different surface mount package (SOD-123FL vs. DO-219AB). The PTVS64VS1UTR,115 operates at significantly higher voltage levels (64V standoff, 103V clamp) and is not electrically equivalent for 22V protection applications.

Parameter Comparison

Parameter	SMF22A-M3-08	SMF22A-TP	PTVS64VS1UTR,115
Manufacturer	Vishay General Semiconductor	Micro Commercial Co	Nexperia USA Inc.
Voltage - Reverse Standoff (Typ)	22V	22V	64V
Voltage - Breakdown (Min)	24.4V	24.4V	71.1V
Voltage - Clamping (Max) @ Ipp	35.5V	35.5V	103V
Current - Peak Pulse (10/1000µs)	5.6A	5.6A	3.9A
Power - Peak Pulse	200W	200W	400W
Operating Temperature Range	-65 to 175°C (TJ)	-65 to 175°C (TA)	-55 to 185°C (TA)
Package / Case	DO-219AB (SMF)	SOD-123F (SOD-123FL)	SOD-123W
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Qualification	—	—	AEC-Q101

Engineering Selection Recommendations

SMF22A-TP (Micro Commercial Co): This part is electrically equivalent to the SMF22A-M3-08, maintaining identical voltage specifications (22V standoff, 35.5V clamp) and current ratings (5.6A peak pulse). Both parts are Active status and ROHS3 compliant. The primary difference is the surface mount package format (SOD-123FL vs. DO-219AB), which affects PCB footprint and thermal characteristics. Selection between these two depends on PCB layout requirements and available board space.

PTVS64VS1UTR,115 (Nexperia USA Inc.): This part operates at significantly higher voltage levels (64V standoff, 103V clamp) and is not electrically equivalent for applications requiring 22V protection. This device is suitable only for circuits requiring higher voltage transient suppression. The part includes AEC-Q101 automotive qualification, indicating suitability for automotive applications where the higher voltage rating is appropriate.

Frequently Asked Questions (FAQ)

Q: Can SMF22A-TP directly replace SMF22A-M3-08 in my circuit? A: Yes, the SMF22A-TP is electrically equivalent with identical voltage and current specifications. The substitution is valid if the SOD-123FL package footprint is compatible with your PCB layout. Both parts maintain the same 22V reverse standoff and 35.5V clamping characteristics.

Q: Why is PTVS64VS1UTR,115 listed as a substitute if it has different voltage ratings? A: The PTVS64VS1UTR,115 is not a direct electrical substitute for 22V protection applications. It is listed as a cross-reference option only for applications requiring higher voltage transient suppression (64V standoff). Selecting this part for a 22V circuit would result in inadequate protection.

Q: What is the difference between DO-219AB and SOD-123F packages? A: Both are surface mount packages for TVS diodes. DO-219AB (SMF) and SOD-123F (SOD-123FL) differ in physical dimensions and PCB footprint. Package selection depends on available board space and thermal management requirements. Consult package datasheets for specific dimensional specifications.

Q: Are all listed parts ROHS3 compliant? A: Yes, all three parts (SMF22A-M3-08, SMF22A-TP, and PTVS64VS1UTR,115) are ROHS3 compliant and suitable for applications with RoHS regulatory requirements.

Q: What does AEC-Q101 qualification mean for PTVS64VS1UTR,115? A: AEC-Q101 is an automotive industry qualification standard. The PTVS64VS1UTR,115 meets this qualification, indicating it is suitable for automotive applications. The SMF22A-M3-08 and SMF22A-TP do not carry this specific automotive qualification.

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