SMF28A-M3-08 Equivalent & Substitute Parts

Part Overview

The SMF28A-M3-08 is an active Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This unidirectional zener diode operates with a 28V reverse standoff voltage and provides 45.4V maximum clamping voltage at peak pulse current. The device is designed for general-purpose transient suppression applications in surface mount configurations using the DO-219AB (SMF) package. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the TVS diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	45.4	V
Current - Peak Pulse (10/1000µs)	4.4	A
Power - Peak Pulse	200	W
Capacitance @ 1MHz	227	pF
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-219AB (SMF)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes is determined by matching the following critical parameters: reverse standoff voltage, breakdown voltage range, clamping voltage, peak pulse current rating, and power dissipation capability. Package compatibility and operating temperature range are secondary mechanical and thermal considerations.

The SMF28A-M3-08 has been identified with two substitute categories:

Category 1: Direct Electrical Equivalent (Same Voltage Class) Parts matching the 28V reverse standoff voltage, 31.1V minimum breakdown, 45.4V clamping voltage, and 4.4A peak pulse current specification. These substitutes maintain identical electrical performance within the same voltage suppression class.

Category 2: Higher Voltage Class Substitute Parts with elevated voltage ratings that provide suppression at higher voltage levels. These are suitable only when circuit design permits operation at the higher voltage threshold.

Parameter Comparison

Parameter	SMF28A-M3-08 (Main)	SMF28A-HM3-08	PTVS64VS1UTR,115	SMF28A-TP
Manufacturer	Vishay	Vishay	Nexperia USA Inc.	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	28V	28V	64V	28V
Voltage - Breakdown (Min)	31.1V	31.1V	71.1V	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V	45.4V	103V	45.4V
Current - Peak Pulse (10/1000µs)	4.4A	4.4A	3.9A	4.4A
Power - Peak Pulse	200W	200W	400W	200W
Operating Temperature Range	-65 to 175°C (TJ)	-65 to 175°C (TJ)	-55 to 185°C (TA)	-65 to 175°C (TA)
Package / Case	DO-219AB (SMF)	DO-219AB (SMF)	SOD-123W	SOD-123F
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

SMF28A-HM3-08 (Vishay): Direct equivalent with identical electrical specifications and DO-219AB package compatibility. This part includes AEC-Q101 automotive qualification, providing enhanced reliability for automotive and industrial applications. Recommended as the primary substitute when automotive-grade components are required.

SMF28A-TP (Micro Commercial Co): Electrical equivalent with matching 28V voltage class, 4.4A peak pulse current, and 200W power rating. Package differs to SOD-123FL, requiring PCB layout modification. Suitable for applications where package footprint change is acceptable and general-purpose grade is sufficient.

PTVS64VS1UTR,115 (Nexperia): Higher voltage class device with 64V reverse standoff and 103V clamping voltage. Peak pulse current is 3.9A with 400W power dissipation. This part is suitable only for circuits designed to operate at the 64V voltage suppression level. Package is SOD-123W, requiring PCB redesign. Includes AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can SMF28A-HM3-08 replace SMF28A-M3-08 directly? A: Yes. Both parts share identical electrical parameters (28V standoff, 31.1V breakdown, 45.4V clamping, 4.4A peak pulse) and the same DO-219AB package. The primary difference is automotive-grade qualification (AEC-Q101) on the HM3-08 variant.

Q: What is the difference between SMF28A-TP and the main part? A: Electrical specifications are identical. The SMF28A-TP uses SOD-123FL package instead of DO-219AB (SMF), requiring PCB footprint modification. Both maintain 28V voltage class and 4.4A peak pulse current.

Q: When should PTVS64VS1UTR,115 be used as a substitute? A: Only when the circuit design requires suppression at 64V voltage levels. This part has higher breakdown and clamping voltages (71.1V and 103V respectively) and is not interchangeable with 28V-class devices in existing designs.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed parts maintain ROHS3 compliance and REACH unaffected status.

Q: What are the package implications for substitution? A: SMF28A-HM3-08 maintains the original DO-219AB package for direct PCB compatibility. SMF28A-TP and PTVS64VS1UTR,115 require different packages (SOD-123FL and SOD-123W respectively), necessitating PCB layout redesign.

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