SMF28A-M3-18 Equivalent & Substitute Parts

Part Overview

The SMF28A-M3-18 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 overvoltage protection for general-purpose applications. The device features a 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 4.4A peak pulse current capability. The part is Active in product status and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, thermal operating range, and mechanical packaging compatibility.

Substiute Parts

SMF28A-M3-18

Vishay General Semiconductor - Diodes DivisionIn Stock: 883SMF28A-M3-18 Datasheet

Current PartRFQ

SMF28A-HM3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 30665SMF28A-HM3-08 Datasheet

DirectRFQ

SMF28A-TP

Micro Commercial CoIn Stock: 1931SMF28A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF28A-M3-18 are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

• Voltage - Reverse Standoff: 28V
• Voltage - Breakdown (Min): 31.1V
• Voltage - Clamping (Max) @ Ipp: 45.4V
• Current - Peak Pulse (10/1000µs): 4.4A
• Power - Peak Pulse: 200W
• Type: Zener, Unidirectional
• Operating Temperature Range: -65°C ~ 175°C
• RoHS3 Compliance

Substitute Categories:

Category 1: Direct Equivalent (Same Package) SMF28A-HM3-08 maintains identical electrical specifications and the same DO-219AB (SMF) package footprint. This substitute is qualified for automotive applications with AEC-Q101 certification.

Category 2: Manufacturer Alternative (Different Package) SMF28A-TP is manufactured by Micro Commercial Co and provides equivalent electrical performance. This part uses the SOD-123FL package, which differs mechanically from the original DO-219AB package and requires PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

SMF28A-HM3-08 (Vishay): This substitute is the preferred direct equivalent. It maintains identical electrical specifications and package footprint compatibility with the SMF28A-M3-18. The part includes AEC-Q101 automotive qualification, extending its application scope. No PCB layout modifications are required for this substitution.

SMF28A-TP (Micro Commercial Co): This substitute provides equivalent electrical performance but uses the SOD-123FL package instead of DO-219AB. Selection of this part requires PCB layout redesign to accommodate the different package footprint. Both parts maintain RoHS3 compliance and Active product status.

Frequently Asked Questions (FAQ)

Q: Can SMF28A-HM3-08 be used as a direct replacement for SMF28A-M3-18? A: Yes. Both parts share identical electrical specifications (28V standoff, 45.4V clamping, 4.4A peak pulse current, 200W peak power) and the same DO-219AB package footprint. No design modifications are required.

Q: What is the primary difference between SMF28A-M3-18 and SMF28A-TP? A: The electrical specifications are equivalent. The primary difference is the package: SMF28A-M3-18 uses DO-219AB (SMF), while SMF28A-TP uses SOD-123FL. This package difference requires PCB layout modification for substitution.

Q: Does SMF28A-HM3-08 have automotive qualification? A: Yes. SMF28A-HM3-08 carries AEC-Q101 qualification, making it suitable for automotive applications where this certification is required.

Q: Are all three parts RoHS3 compliant? A: Yes. SMF28A-M3-18, SMF28A-HM3-08, and SMF28A-TP are all RoHS3 compliant.

Q: What operating temperature range applies to these TVS diodes? A: All three parts operate across -65°C to 175°C. SMF28A-M3-18 and SMF28A-HM3-08 specify this as junction temperature (TJ), while SMF28A-TP specifies ambient temperature (TA).

Q: Can package footprint differences affect circuit performance? A: Package differences do not affect electrical performance but require PCB layout redesign. The SOD-123FL package (SMF28A-TP) has different lead spacing and dimensions compared to DO-219AB (SMF28A-M3-18 and SMF28A-HM3-08).