SA33HE3/54 Equivalent & Substitute Parts

Part Overview

The SA33HE3/54 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for transient overvoltage protection in through-hole applications using the DO-204AC (DO-15) axial package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SA33HE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1212SA33HE3/54 Datasheet

Current PartRFQ

SA33AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1032SA33AHE3/54 Datasheet

DirectRFQ

P6KE39A

Taiwan Semiconductor CorporationIn Stock: 18061P6KE39A Datasheet

MFR RecommendedRFQ

SA33A

Fairchild SemiconductorIn Stock: 21325SA33A Datasheet

MFR RecommendedRFQ

SA33A-TP

Micro Commercial CoIn Stock: 3421SA33A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA33HE3/54 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 33V nominal
• Voltage - Breakdown (Min): 36.7V minimum
• Voltage - Clamping (Max) @ Ipp: Maximum allowable clamping voltage
• Current - Peak Pulse (10/1000µs): Peak pulse current handling capability
• Power - Peak Pulse: Peak pulse power dissipation
• Package / Case: DO-204AC (DO-15) axial through-hole configuration
• Mounting Type: Through-hole compatibility
• Operating Temperature Range: -55°C ~ 175°C

Substitute parts must maintain electrical compatibility within these parameters while meeting the same package and mounting requirements. Parts are grouped by their ability to satisfy these constraints.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SA33AHE3/54

The SA33AHE3/54 is the direct equivalent from Vishay with active product status. It maintains identical reverse standoff voltage (33V) and breakdown voltage (36.7V) specifications. The clamping voltage is reduced to 53.3V compared to the original 59V, and peak pulse current is increased to 9.4A. This part carries AEC-Q101 automotive qualification and ROHS3 compliance, matching the original part's certifications.

Secondary Substitute: P6KE39A

The P6KE39A from Taiwan Semiconductor Corporation is an active product with compatible electrical parameters. Reverse standoff voltage is 33.3V and breakdown voltage is 37.1V, both within acceptable tolerance of the original specification. Clamping voltage is 53.9V with peak pulse current of 11.2A and increased power dissipation of 600W. This part is ROHS3 compliant and suitable for general-purpose applications.

Tertiary Substitutes: SA33A and SA33A-TP

SA33A (Fairchild, obsolete) and SA33A-TP (Micro Commercial Co, active) both provide equivalent electrical performance with 33V reverse standoff voltage and 36.7V breakdown voltage. SA33A-TP is preferred due to active product status and includes operating temperature range specification (-55°C ~ 175°C). Both maintain 500W peak pulse power and are ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can SA33AHE3/54 directly replace SA33HE3/54?

A: Yes. SA33AHE3/54 is the active equivalent from the same manufacturer with identical reverse standoff and breakdown voltages. The reduced clamping voltage (53.3V vs 59V) and increased peak pulse current (9.4A vs 8.5A) represent improved performance characteristics within the same electrical class.

Q: What is the difference between clamping voltage specifications?

A: Clamping voltage is the maximum voltage across the TVS diode when conducting peak pulse current. The SA33HE3/54 specifies 59V maximum clamping, while substitutes range from 53.3V to 53.9V. Lower clamping voltage provides better transient suppression performance in the application circuit.

Q: Are all substitute parts automotive-grade?

A: SA33AHE3/54 carries AEC-Q101 automotive qualification matching the original part. P6KE39A, SA33A, and SA33A-TP are general-purpose TVS diodes without explicit automotive qualification statements in the provided specifications.

Q: Can I use P6KE39A in place of SA33HE3/54?

A: Yes, with consideration of increased power dissipation. P6KE39A provides 600W peak pulse power versus 500W in the original, with higher peak pulse current (11.2A vs 8.5A). The electrical voltage parameters are compatible within specification tolerances.

Q: What packaging options are available for substitutes?

A: All substitute parts are available in DO-204AC (DO-15) axial through-hole package. SA33AHE3/54 is supplied in Tape & Reel (TR) packaging. P6KE39A is supplied in Cut Tape (CT). SA33A is supplied in Bulk. SA33A-TP is supplied in Cut Tape (CT). Package selection depends on procurement and assembly requirements.

Q: Are all parts RoHS compliant?

A: Yes. All listed parts including SA33HE3/54, SA33AHE3/54, P6KE39A, SA33A, and SA33A-TP are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).