SMF40A-M3-08 Equivalent & Substitute Parts

Part Overview

The SMF40A-M3-08 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates as a Zener-type TVS device in the eSMP® series, designed for general-purpose transient voltage suppression applications. The part is currently in active production status with 713 units available in inventory. Alternative equivalent parts are necessary when specific packaging requirements, automotive qualifications, or alternative manufacturer sourcing are required for production continuity or design flexibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	64.5	V
Current - Peak Pulse (10/1000µs)	3.1	A
Power - Peak Pulse	200	W
Capacitance @ 1MHz	172	pF
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-219AB (SMF)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMF40A-M3-08 are grouped based on electrical parameter compatibility and packaging considerations. The primary substitution criteria are:

Electrical Parameters (Critical for Substitution):

Voltage - Reverse Standoff (Typ): 40V
Voltage - Clamping (Max) @ Ipp: 64.5V
Current - Peak Pulse (10/1000µs): 3.1A
Power - Peak Pulse: 200W

Secondary Considerations:

Package / Case format (DO-219AB, SOD-123W, SOD-123FL)
Mounting Type (Surface Mount)
Operating Temperature Range
Compliance certifications (RoHS3, AEC-Q101 where applicable)

Parts are classified as direct equivalents when all critical electrical parameters match exactly. Parts with different package formats are listed as functional equivalents with package-specific considerations.

Parameter Comparison

Parameter	SMF40A-M3-08	SMF40A-HM3-08	PTVS64VS1UTR,115	SMF40A-TP
Manufacturer	Vishay	Vishay	Nexperia USA Inc.	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	40V	40V	64V	40V
Voltage - Breakdown (Min)	44.4V	44.4V	71.1V	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V	64.5V	103V	64.5V
Current - Peak Pulse (10/1000µs)	3.1A	3.1A	3.9A	3.1A
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
Automotive Grade	—	AEC-Q101	AEC-Q101	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Available	713 Pcs	28421 Pcs	12600 Pcs	7260 Pcs

Engineering Selection Recommendations

SMF40A-HM3-08 (Vishay): This part is a direct electrical equivalent with identical voltage and current ratings. The primary distinction is AEC-Q101 automotive qualification and significantly higher inventory availability (28,421 units). Selection is appropriate when automotive-grade components are required or when higher stock levels are necessary for production planning.

SMF40A-TP (Micro Commercial Co): This part maintains identical electrical specifications (40V standoff, 64.5V clamping, 3.1A peak pulse) but uses SOD-123FL packaging instead of DO-219AB. This substitute is suitable for designs where SOD-123F footprint compatibility is required. Operating temperature range and RoHS3 compliance are maintained.

PTVS64VS1UTR,115 (Nexperia USA Inc.): This part operates at higher voltage levels (64V standoff, 103V clamping) with increased peak pulse current (3.9A) and power rating (400W). This part is not a direct electrical equivalent and is suitable only for applications requiring higher voltage suppression capability. AEC-Q101 automotive qualification and extended operating temperature range (-55 to 185°C) are provided. Package format is SOD-123W.

Frequently Asked Questions (FAQ)

Q: Can SMF40A-HM3-08 be used as a direct replacement for SMF40A-M3-08?

A: Yes. Both parts share identical electrical specifications: 40V reverse standoff voltage, 64.5V clamping voltage, and 3.1A peak pulse current. The primary difference is that SMF40A-HM3-08 includes AEC-Q101 automotive qualification. Both use DO-219AB packaging and are ROHS3 compliant.

Q: What is the difference between SMF40A-TP and the original SMF40A-M3-08?

A: Electrical specifications are identical. The difference is packaging: SMF40A-TP uses SOD-123FL format while SMF40A-M3-08 uses DO-219AB. PCB footprint and land pattern requirements differ between these packages. Verify PCB layout compatibility before substitution.

Q: Is PTVS64VS1UTR,115 compatible with SMF40A-M3-08 applications?

A: PTVS64VS1UTR,115 is not a direct electrical equivalent. It operates at significantly higher voltage levels (64V standoff vs. 40V, 103V clamping vs. 64.5V). This part is suitable only for circuits designed for higher voltage suppression. Do not substitute in applications requiring 40V standoff voltage.

Q: What are the key parameters that determine substitution compatibility?

A: The critical parameters are Voltage - Reverse Standoff (Typ), Voltage - Clamping (Max) @ Ipp, and Current - Peak Pulse (10/1000µs). Parts with identical values in these three parameters are electrically interchangeable. Package format and mounting type must also be verified for PCB compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SMF40A-HM3-08, PTVS64VS1UTR,115, and SMF40A-TP) are ROHS3 compliant, matching the compliance status of the original SMF40A-M3-08.

Q: Which substitute part has automotive qualification?

A: SMF40A-HM3-08 and PTVS64VS1UTR,115 both carry AEC-Q101 automotive qualification. SMF40A-TP does not include automotive grading. Select AEC-Q101 qualified parts for automotive applications.

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