SMF45A-M3-08 Equivalent & Substitute Parts

Part Overview

The SMF45A-M3-08 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates with a 45V reverse standoff voltage and provides 72.7V maximum clamping voltage at peak pulse current. The device is designed for general-purpose transient voltage suppression applications and is currently in active production status. Equivalent and substitute parts are identified to support design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	45	V
Voltage - Breakdown (Min)	50	V
Voltage - Clamping (Max) @ Ipp	72.7	V
Current - Peak Pulse (10/1000µs)	2.8	A
Power - Peak Pulse	200	W
Operating Temperature Range	-65 to 175	°C (TJ)
Package / Case	DO-219AB (SMF)	-
Capacitance @ 1MHz	162	pF
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SMF45A-M3-08 are identified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 45V nominal operation
Voltage - Clamping (Max) @ Ipp: 72.7V maximum
Current - Peak Pulse: 2.8A minimum
Power - Peak Pulse: 200W minimum
Type: Unidirectional Zener TVS diode
RoHS3 Compliance: Required
Mounting Type: Surface Mount

Substitute Parts Identified:

SMF45A-TP (Micro Commercial Co) - Direct electrical equivalent with identical voltage and current ratings. Package variant: SOD-123FL instead of DO-219AB.
PTVS64VS1UTR,115 (Nexperia USA Inc.) - Higher voltage rating (64V standoff, 103V clamp) with increased current capacity (3.9A) and power dissipation (400W). Automotive-grade with AEC-Q101 qualification. Package: SOD-123W.

Parameter Comparison

Parameter	SMF45A-M3-08 (Main)	SMF45A-TP	PTVS64VS1UTR,115
Manufacturer	Vishay General Semiconductor	Micro Commercial Co	Nexperia USA Inc.
Voltage - Reverse Standoff (Typ)	45V	45V	64V
Voltage - Breakdown (Min)	50V	50V	71.1V
Voltage - Clamping (Max) @ Ipp	72.7V	72.7V	103V
Current - Peak Pulse (10/1000µs)	2.8A	2.8A	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-123W
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Automotive Grade	-	-	AEC-Q101

Engineering Selection Recommendations

SMF45A-TP Selection: Choose SMF45A-TP when package footprint compatibility with SOD-123FL is acceptable. This substitute maintains identical electrical specifications (45V standoff, 72.7V clamp, 2.8A peak pulse) and temperature range as the main part. Both devices are ROHS3 compliant and in active production status.

PTVS64VS1UTR,115 Selection: Select PTVS64VS1UTR,115 for applications requiring higher voltage suppression capability (64V standoff, 103V clamp) and increased transient energy absorption (400W vs. 200W). This part is suitable for circuits with higher transient voltage stress. The device carries AEC-Q101 automotive qualification and operates across an extended temperature range (-55 to 185°C). Package footprint is SOD-123W. This substitute is appropriate only when the higher voltage ratings do not conflict with circuit design specifications.

All substitute parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can SMF45A-TP be used as a direct replacement for SMF45A-M3-08?

A: Yes, SMF45A-TP is electrically equivalent with identical voltage ratings (45V standoff, 72.7V clamp) and current specifications (2.8A peak pulse). The primary difference is the package format: SMF45A-TP uses SOD-123FL instead of DO-219AB (SMF). Verify PCB footprint compatibility before substitution.

Q: What is the key difference between SMF45A-M3-08 and PTVS64VS1UTR,115?

A: PTVS64VS1UTR,115 has higher voltage ratings (64V standoff vs. 45V) and increased power dissipation capability (400W vs. 200W). This substitute is suitable only for circuits designed to tolerate higher clamping voltages. Do not use PTVS64VS1UTR,115 in applications where the 45V standoff voltage is a critical design parameter.

Q: Are all substitute parts RoHS compliant?

A: Yes. SMF45A-M3-08, SMF45A-TP, and PTVS64VS1UTR,115 are all ROHS3 compliant.

Q: What is the operating temperature difference between the main part and substitutes?

A: SMF45A-M3-08 and SMF45A-TP both operate from -65 to 175°C (junction/ambient). PTVS64VS1UTR,115 operates from -55 to 185°C, providing a wider temperature range at the upper limit.

Q: Is PTVS64VS1UTR,115 suitable for automotive applications?

A: PTVS64VS1UTR,115 carries AEC-Q101 automotive qualification. SMF45A-M3-08 and SMF45A-TP do not list automotive qualification. Use PTVS64VS1UTR,115 only in automotive designs where AEC-Q101 compliance is required.

Q: What package considerations apply when selecting a substitute?

A: SMF45A-M3-08 uses DO-219AB (SMF) package. SMF45A-TP uses SOD-123FL, and PTVS64VS1UTR,115 uses SOD-123W. Each package has different PCB footprint dimensions. Verify footprint compatibility with your circuit board layout before component selection.

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