SA33C-E3/73 Equivalent & Substitute Parts

Part Overview

The SA33C-E3/73 is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. The SA33C-E3/73 operates as a unidirectional Zener-type TVS diode in a through-hole DO-204AC (DO-15) axial package, designed for general-purpose transient voltage suppression applications.

Substiute Parts

SA33C-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 748SA33C-E3/73 Datasheet

Current PartRFQ

SA33CA-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 709SA33CA-E3/73 Datasheet

DirectRFQ

P6KE39CA

Fairchild SemiconductorIn Stock: 27147P6KE39CA Datasheet

MFR RecommendedRFQ

SA33CA

Fairchild SemiconductorIn Stock: 13784SA33CA Datasheet

MFR RecommendedRFQ

SA33CA-TP

Micro Commercial CoIn Stock: 993SA33CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA33C-E3/73 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 33V
• Voltage - Breakdown (Min): 36.7V
• Bidirectional Channels: 1
• Mounting Type: Through Hole
• Package / Case: DO-204AC, DO-15, Axial
• Operating Temperature Range: -55°C ~ 175°C
• Power - Peak Pulse: 500W

Substitute parts must maintain these core specifications to ensure functional equivalence. Variations in voltage clamping characteristics and peak pulse current are permissible within the established electrical envelope, provided the reverse standoff voltage, breakdown voltage, and thermal operating range remain consistent.

Parameter Comparison

Engineering Selection Recommendations

SA33CA-E3/73 is the primary direct substitute for SA33C-E3/73. Both parts share identical reverse standoff voltage (33V), breakdown voltage (36.7V), power rating (500W), operating temperature range (-55°C ~ 175°C), and package configuration (DO-204AC, DO-15, Axial). The SA33CA-E3/73 maintains active product status, ensuring long-term availability and supply chain continuity. Voltage clamping is reduced from 59V to 53.3V, with peak pulse current increased from 8.5A to 9.4A, representing an improved performance envelope within the same electrical class.

SA33CA and SA33CA-TP are secondary substitutes with equivalent electrical specifications to SA33CA-E3/73. SA33CA is classified as obsolete but shares all critical parameters. SA33CA-TP is manufactured by Micro Commercial Co and maintains active status with identical electrical characteristics, differing only in packaging format (Tape & Reel versus bulk).

P6KE39CA, manufactured by Fairchild Semiconductor, is listed as a substitute but lacks complete parameter documentation in the provided data. Selection of this part requires verification of electrical equivalence against the primary substitute specifications.

For new designs and procurement, SA33CA-E3/73 is the recommended selection due to active product status and full parameter alignment with the obsolete SA33C-E3/73.

Frequently Asked Questions (FAQ)

Q: Can SA33CA-E3/73 directly replace SA33C-E3/73 in existing designs?

A: Yes. Both parts maintain identical reverse standoff voltage (33V), breakdown voltage (36.7V), power rating (500W), operating temperature range (-55°C ~ 175°C), and DO-204AC/DO-15 axial package configuration. The SA33CA-E3/73 exhibits lower voltage clamping (53.3V versus 59V) and higher peak pulse current (9.4A versus 8.5A), representing improved transient suppression performance within the same electrical class.

Q: What is the difference between SA33CA-E3/73 and SA33CA-TP?

A: Both parts are electrically equivalent with identical voltage ratings, breakdown characteristics, and operating temperature ranges. The primary difference is packaging format: SA33CA-E3/73 is supplied in bulk packaging, while SA33CA-TP is supplied in Tape & Reel (TR) format. SA33CA-TP is manufactured by Micro Commercial Co, whereas SA33CA-E3/73 is manufactured by Vishay. Both maintain active product status.

Q: Are there any compliance or certification differences between substitute parts?

A: SA33C-E3/73, SA33CA-E3/73, SA33CA, and SA33CA-TP all maintain ROHS3 compliance and identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts with complete specifications. P6KE39CA compliance data is not provided in the available documentation.

Q: Can SA33CA be used as a substitute despite its obsolete status?

A: SA33CA shares all critical electrical and mechanical parameters with SA33C-E3/73 and is functionally equivalent. However, due to obsolete product status, long-term availability cannot be assured. SA33CA-E3/73 is the preferred selection for new procurement due to active product status.

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

A: Substitution is determined by reverse standoff voltage (33V), breakdown voltage (36.7V), bidirectional channel configuration (1), mounting type (Through Hole), package format (DO-204AC/DO-15 Axial), operating temperature range (-55°C ~ 175°C), and power rating (500W). Variations in voltage clamping and peak pulse current are permissible within the established electrical envelope.