SA12CA-T Equivalent & Substitute Parts

Part Overview

The SA12CA-T is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in through-hole applications. This component features a 12V reverse standoff voltage with a 19.9V maximum clamping voltage and 25.1A peak pulse current capability in a DO-15 package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	12V
Voltage - Breakdown (Min)	13.3V
Voltage - Clamping (Max) @ Ipp	19.9V
Current - Peak Pulse (10/1000µs)	25.1A
Power - Peak Pulse	500W
Type	Zener
Bidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature	-65°C ~ 175°C (TJ)

Substitute Part Grouping Explanation

Substitution for the SA12CA-T is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 12V
Voltage - Clamping (Max) @ Ipp: 19.9V
Current - Peak Pulse (10/1000µs): 25.1A minimum
Package / Case: DO-15 or DO-204AC (DO-15)
Mounting Type: Through Hole
Type: Zener, Bidirectional, Single Channel

Substitute parts are grouped into two categories: direct electrical equivalents with identical peak pulse current (25.1A) and manufacturer-recommended alternatives with slightly elevated peak pulse current (25.6A), which remain functionally compatible within the specified voltage and power parameters.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Package	Operating Temperature	Inventory
SA12CA-T	Diodes Incorporated	Obsolete	12V	19.9V	25.1A	DO-15	-65°C ~ 175°C	846 Pcs
P5KE12CA-AP	Micro Commercial Co	Active	12V	19.9V	25.1A	DO-15	-65°C ~ 175°C	765 Pcs
P5KE12CA-BP	Micro Commercial Co	Active	12V	19.9V	25.1A	DO-15	-65°C ~ 175°C	995 Pcs
P5KE12CA-TP	Micro Commercial Co	Active	12V	19.9V	25.1A	DO-15	-65°C ~ 175°C	788 Pcs
SA12CA	Fairchild Semiconductor	Obsolete	12V	19.9V	25.1A	DO-15	Not Specified	6400 Pcs
SA12CA-E3/54	Vishay General Semiconductor - Diodes Division	Active	12V	19.9V	25.1A	DO-204AC (DO-15)	-55°C ~ 175°C	10907 Pcs
SA12CAHE3/54	Vishay General Semiconductor - Diodes Division	Active	12V	19.9V	25.1A	DO-204AC (DO-15)	-55°C ~ 175°C	1023 Pcs
SA12CA-AP	Micro Commercial Co	Active	12V	19.9V	25.6A	DO-15	-55°C ~ 175°C	915 Pcs
SA12CA-B	Littelfuse Inc.	Active	12V	19.9V	25.6A	DO-204AC (DO-15)	-55°C ~ 175°C	2099 Pcs
SA12CA-BP	Micro Commercial Co	Active	12V	19.9V	25.6A	DO-15	-55°C ~ 175°C	931 Pcs
SA12CA-TP	Micro Commercial Co	Active	12V	19.9V	25.6A	DO-15	-55°C ~ 175°C	1361 Pcs

Engineering Selection Recommendations

Direct electrical equivalents with 25.1A peak pulse current are preferred for applications requiring exact parameter matching: P5KE12CA-AP, P5KE12CA-BP, P5KE12CA-TP (Micro Commercial Co), SA12CA-E3/54, and SA12CAHE3/54 (Vishay). All are active products with ROHS3 compliance and REACH unaffected status.

Manufacturer-recommended alternatives with 25.6A peak pulse current (SA12CA-AP, SA12CA-B, SA12CA-BP, SA12CA-TP) provide enhanced current handling capability while maintaining identical voltage specifications. These parts are suitable for applications where additional margin is acceptable. SA12CA-B (Littelfuse) and Vishay parts (SA12CA-E3/54, SA12CAHE3/54) offer the highest inventory availability.

For automotive applications requiring AEC-Q101 qualification, SA12CAHE3/54 is the designated option. All active substitutes support the full operating temperature range of -55°C to 175°C, with the exception of the original SA12CA-T specification (-65°C minimum).

Frequently Asked Questions (FAQ)

Q: Can P5KE12CA series parts directly replace SA12CA-T?

A: Yes. P5KE12CA-AP, P5KE12CA-BP, and P5KE12CA-TP are direct electrical equivalents with identical voltage and current specifications. All are active products in DO-15 packaging.

Q: What is the difference between 25.1A and 25.6A peak pulse current ratings?

A: Both ratings satisfy the 12V/19.9V voltage specification. The 25.6A variants provide additional current margin. Selection depends on application requirements; both are functionally compatible within the specified electrical parameters.

Q: Are Vishay SA12CA-E3/54 and SA12CAHE3/54 interchangeable?

A: Both are electrically identical with identical voltage and current ratings. SA12CA-E3/54 is supplied in cut tape; SA12CAHE3/54 is supplied in tape and reel. SA12CAHE3/54 includes AEC-Q101 automotive qualification.

Q: Does package designation DO-204AC differ from DO-15?

A: DO-204AC and DO-15 are equivalent designations for the same axial through-hole package. Both terms refer to the same physical form factor.

Q: Which substitute offers the best availability?

A: SA12CA-E3/54 (Vishay) has the highest inventory at 10,907 pieces. SA12CA-B (Littelfuse) provides 2,099 pieces with active status.

Q: Is the original SA12CA-T still available?

A: SA12CA-T is classified as obsolete. The 846 pieces in inventory represent remaining stock. Active substitutes are recommended for new designs and ongoing procurement.

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