SMF33A-M3-08 Equivalent & Substitute Parts

Part Overview

The SMF33A-M3-08 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 33V reverse standoff category with a 53.3V maximum clamping voltage and 3.8A peak pulse current rating. The device is packaged in DO-219AB (SMF) and is ROHS3 compliant with active product status. Equivalent and substitute parts are identified based on matching electrical performance parameters and compatible packaging configurations for general purpose transient protection applications.

Substiute Parts

SMF33A-M3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 4493SMF33A-M3-08 Datasheet

Current PartRFQ

SMF33A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 29482SMF33A-E3-08 Datasheet

DirectRFQ

PTVS64VS1UTR,115

Nexperia USA Inc.In Stock: 12649PTVS64VS1UTR,115 Datasheet

MFR RecommendedRFQ

SMF33A-TP

Micro Commercial CoIn Stock: 127722SMF33A-TP Datasheet

MFR RecommendedRFQ

SZSMF33AT1G

LittelfuseIn Stock: 23122SZSMF33AT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF33A-M3-08 are categorized based on the following electrical and mechanical criteria:

Group 1 - Direct Equivalent (Same Electrical Performance & Package):

• Voltage - Reverse Standoff: 33V
• Voltage - Clamping (Max) @ Ipp: 53.3V
• Current - Peak Pulse: 3.8A
• Power - Peak Pulse: 200W
• Package compatibility: DO-219AB or equivalent surface mount packages

Group 2 - Functional Equivalent (Matching Electrical Performance, Different Package):

• Voltage - Reverse Standoff: 33V
• Voltage - Clamping (Max) @ Ipp: 53.3V
• Current - Peak Pulse: 3.8A
• Power - Peak Pulse: 200W
• Package: SOD-123F or SOD-123FL (alternative surface mount packages)

Group 3 - Higher Voltage Rating (Different Electrical Performance):

• Voltage - Reverse Standoff: 64V
• Voltage - Clamping (Max) @ Ipp: 103V
• Current - Peak Pulse: 3.9A
• Power - Peak Pulse: 400W
• Package: SOD-123W (suitable for higher voltage protection circuits)

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution (Identical Electrical & Package Performance): SMF33A-E3-08 is a direct equivalent to SMF33A-M3-08, manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) with identical electrical specifications and DO-219AB packaging. Both devices maintain ROHS3 compliance and active product status.

Package-Compatible Substitution (Identical Electrical Performance, Alternative Package): SMF33A-TP (Micro Commercial Co) and SZSMF33AT1G (Littelfuse) provide equivalent electrical performance with SOD-123F packaging. These parts maintain the 33V reverse standoff, 53.3V clamping voltage, and 3.8A peak pulse current. SZSMF33AT1G includes AEC-Q101 automotive qualification. Operating temperature ranges differ slightly; verify thermal requirements for specific applications.

Higher Voltage Alternative (Different Electrical Performance): PTVS64VS1UTR,115 (Nexperia USA Inc.) operates at 64V reverse standoff with 103V clamping voltage and increased power dissipation (400W). This part is suitable only for circuits requiring higher voltage protection. AEC-Q101 automotive qualification is included. Package is SOD-123W.

Frequently Asked Questions (FAQ)

Q: Can SMF33A-E3-08 replace SMF33A-M3-08 directly? A: Yes. Both parts are manufactured by Vishay General Semiconductor - Diodes Division with identical electrical specifications (33V standoff, 53.3V clamping, 3.8A peak pulse) and DO-219AB packaging. No circuit modifications are required.

Q: What is the difference between DO-219AB and SOD-123F packages? A: Both are surface mount packages for TVS diodes. DO-219AB (SMF) and SOD-123F are physically different but electrically compatible when electrical parameters match. Verify PCB footprint compatibility before substitution.

Q: Can PTVS64VS1UTR,115 replace SMF33A-M3-08? A: No. PTVS64VS1UTR,115 operates at 64V reverse standoff versus 33V for SMF33A-M3-08. This higher voltage rating is suitable only for circuits designed for 64V protection. Use only when circuit voltage requirements match.

Q: Are SZSMF33AT1G and SMF33A-TP interchangeable? A: Both provide identical electrical performance (33V standoff, 53.3V clamping, 3.8A peak pulse) in SOD-123F packaging. SZSMF33AT1G includes AEC-Q101 automotive qualification; SMF33A-TP does not. Operating temperature ranges differ slightly (-65°C ~ 175°C versus -55°C ~ 150°C). Verify application requirements before selection.

Q: What does ROHS3 compliance mean? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All listed parts maintain ROHS3 compliance.

Q: Can I use a substitute part with higher power rating? A: Yes, if electrical parameters (voltage standoff and clamping) match the circuit requirements. Higher power rating (400W versus 200W) provides additional thermal margin but does not affect circuit protection function when voltage specifications align.