SMF43A-HM3-08 Equivalent & Substitute Parts

Part Overview

The SMF43A-HM3-08 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 is designed for transient voltage protection applications. The device features a 43V reverse standoff voltage with a 69.4V maximum clamping voltage and 2.9A peak pulse current capability. The part is Active in product status and carries AEC-Q101 automotive qualification. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part number becomes unavailable or when alternative packaging configurations are required.

Substiute Parts

SMF43A-HM3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 793SMF43A-HM3-08 Datasheet

Current PartRFQ

SMF43A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 3161SMF43A-E3-08 Datasheet

DirectRFQ

SMF43A-TP

Micro Commercial CoIn Stock: 6234SMF43A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF43A-HM3-08 are qualified based on electrical parameter equivalence and mechanical compatibility. The critical substitution criteria are:

• Voltage - Reverse Standoff (Typ): 43V
• Voltage - Breakdown (Min): 47.8V
• Voltage - Clamping (Max) @ Ipp: 69.4V
• Current - Peak Pulse (10/1000µs): 2.9A
• Power - Peak Pulse: 200W
• Unidirectional Channels: 1
• Operating Temperature Range: -65°C to 175°C
• Type: Zener
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The SMF43A-HM3-08 has two identified substitutes: SMF43A-E3-08 (Vishay, same manufacturer, identical electrical specifications, Tape & Reel packaging) and SMF43A-TP (Micro Commercial Co, identical electrical specifications, alternative package configuration SOD-123FL). Both substitutes maintain the core electrical performance parameters and compliance certifications required for direct functional replacement.

Parameter Comparison

Engineering Selection Recommendations

All three parts—SMF43A-HM3-08, SMF43A-E3-08, and SMF43A-TP—maintain Active product status and are ROHS3 compliant with MSL 1 rating. Selection between these parts depends on packaging and sourcing requirements:

SMF43A-E3-08 is the direct equivalent from the same manufacturer (Vishay) with identical electrical specifications and DO-219AB package configuration. This part is preferred when maintaining consistent supplier relationships and package footprint is critical.

SMF43A-TP from Micro Commercial Co provides electrical equivalence but uses the SOD-123F package instead of DO-219AB. This substitute is suitable when PCB layout accommodates the alternative package footprint and when sourcing from multiple manufacturers is acceptable.

The SMF43A-HM3-08 primary part number is recommended when the specific Tape & Reel packaging format and Vishay sourcing are required for production workflows.

Frequently Asked Questions (FAQ)

Q: Can SMF43A-E3-08 be used as a direct replacement for SMF43A-HM3-08?

A: Yes. Both parts are manufactured by Vishay, share identical electrical specifications (43V standoff, 69.4V clamping, 2.9A peak pulse), and use the same DO-219AB package. The primary difference is the packaging format (both Tape & Reel), making SMF43A-E3-08 a direct functional and mechanical substitute.

Q: What is the key difference between SMF43A-TP and the other two parts?

A: SMF43A-TP uses the SOD-123F package instead of DO-219AB. Electrical performance is identical, but the physical footprint differs. PCB layout and component placement must accommodate the SOD-123F package geometry. SMF43A-TP is manufactured by Micro Commercial Co rather than Vishay.

Q: Are all three parts suitable for automotive applications?

A: The SMF43A-HM3-08 carries AEC-Q101 automotive qualification. SMF43A-E3-08 and SMF43A-TP specifications do not explicitly list automotive qualification in the provided data. Automotive application requirements should be confirmed with the respective manufacturers before selection.

Q: What is the significance of the operating temperature specification difference (TJ vs TA)?

A: SMF43A-HM3-08 and SMF43A-E3-08 specify -65°C to 175°C as junction temperature (TJ), while SMF43A-TP specifies -65°C to 175°C as ambient temperature (TA). Both ranges are equivalent in practical application scope, but the measurement reference differs. Confirm thermal management requirements for your specific application.

Q: Can these parts be interchanged on existing PCBs designed for SMF43A-HM3-08?

A: SMF43A-E3-08 can be directly interchanged without PCB modification due to identical DO-219AB package. SMF43A-TP requires PCB redesign to accommodate the SOD-123F footprint and cannot be used on boards designed for DO-219AB packages.

Q: What is the Moisture Sensitivity Level (MSL) 1 rating?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life under normal storage conditions and does not require special moisture control measures during handling or storage.