SA12C-E3/54 Equivalent & Substitute Parts

Part Overview

The SA12C-E3/54 is a Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is rated for 12V reverse standoff voltage with a 22V maximum clamping voltage and 22.7A peak pulse current capability. The device is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

SA12C-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 918SA12C-E3/54 Datasheet

Current PartRFQ

SA12CA-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 10973SA12CA-E3/54 Datasheet

DirectRFQ

SA12CA

Fairchild SemiconductorIn Stock: 6471SA12CA Datasheet

MFR RecommendedRFQ

SA12CA-B

Littelfuse Inc.In Stock: 2160SA12CA-B Datasheet

MFR RecommendedRFQ

SA12CA-TP

Micro Commercial CoIn Stock: 1447SA12CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SA12C-E3/54 is determined by the following critical parameters:

• Voltage Rating: Reverse standoff voltage of 12V and breakdown voltage minimum of 13.3V
• Clamping Voltage: Maximum clamping voltage at peak pulse current (Ipp)
• Peak Pulse Current: Capability to handle 22.7A or greater at 10/1000µs pulse width
• Power Dissipation: Peak pulse power rating of 500W
• Package Compatibility: DO-204AC (DO-15) axial through-hole configuration
• Operating Temperature Range: -55°C to 175°C junction temperature
• Device Type: Zener-type TVS diode with single bidirectional channel

Substitute parts must maintain electrical equivalence across these parameters while meeting the same mechanical and thermal specifications. Variations in clamping voltage and peak pulse current within acceptable engineering tolerances are permissible when the core voltage rating and package form factor remain identical.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SA12CA-E3/54 (Vishay)

The SA12CA-E3/54 is the direct equivalent from the original manufacturer. It maintains identical voltage ratings (12V standoff, 13.3V breakdown minimum) and equivalent power dissipation (500W peak pulse). The clamping voltage is reduced to 19.9V with increased peak pulse current capability (25.1A), representing an improved performance profile within the same electrical class. This part is currently in active production status with 10,907 units in stock, ensuring long-term availability. RoHS3 compliance and MSL-1 moisture sensitivity rating match the original specification.

Secondary Substitutes: SA12CA-B (Littelfuse) and SA12CA-TP (Micro Commercial Co)

Both alternatives maintain the core 12V voltage rating and 13.3V breakdown specification. The SA12CA-B offers 25.6A peak pulse current in bulk packaging from an active manufacturer. The SA12CA-TP provides the same 25.6A capability in cut-tape packaging, also from an active supplier. Both are RoHS3 compliant with MSL-1 ratings. These options provide functional equivalence with enhanced current handling compared to the original part.

Tertiary Option: SA12CA (Fairchild)

The Fairchild SA12CA maintains voltage equivalence but is listed as obsolete. While electrically compatible with 12V standoff and 13.3V breakdown ratings, its discontinued status makes it less suitable for new procurement compared to active alternatives.

Frequently Asked Questions (FAQ)

Q: Can SA12CA-E3/54 directly replace SA12C-E3/54 in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (12V), breakdown voltage (13.3V minimum), and power dissipation (500W peak pulse). The SA12CA-E3/54 features a lower clamping voltage (19.9V vs. 22V) and higher peak pulse current (25.1A vs. 22.7A), representing improved performance characteristics within the same electrical specification class.

Q: What is the difference between SA12CA-E3/54 and SA12CA-TP packaging?

A: SA12CA-E3/54 is supplied in cut tape (CT) packaging, while SA12CA-TP is also cut tape. Both use identical DO-204AC (DO-15) axial through-hole packages. The primary difference is supplier and inventory availability. Selection depends on procurement requirements and lead time considerations.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts—SA12CA-E3/54, SA12CA-B, and SA12CA-TP—carry RoHS3 compliance certification, matching the original SA12C-E3/54 specification.

Q: Does the reduced clamping voltage in SA12CA variants affect circuit protection?

A: No. The SA12CA variants (19.9V clamping) provide superior transient suppression compared to the original SA12C-E3/54 (22V clamping). Lower clamping voltage indicates faster voltage regulation during transient events, which is advantageous for protecting sensitive downstream components.

Q: Which substitute offers the best long-term availability?

A: SA12CA-E3/54 from Vishay is recommended for long-term availability. It is in active production status with the highest inventory level (10,907 units) among all substitutes, ensuring consistent supply for ongoing production and field service requirements.

Q: Can SA12CA-B (bulk packaging) be used in place of cut-tape versions?

A: Yes, from an electrical standpoint. SA12CA-B is electrically equivalent to cut-tape alternatives. Bulk packaging selection depends on assembly process requirements and component handling procedures at your manufacturing facility.