SA12C-E3/73 Equivalent & Substitute Parts

Part Overview

The SA12C-E3/73 is a Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is designed for general-purpose transient voltage suppression in through-hole applications using the DO-204AC (DO-15) axial package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	12V
Voltage - Breakdown (Min)	13.3V
Voltage - Clamping (Max) @ Ipp	22V
Current - Peak Pulse (10/1000µs)	22.7A
Power - Peak Pulse	500W
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SA12C-E3/73 is determined by the following critical parameters:

Reverse Standoff Voltage: 12V (Typ)
Breakdown Voltage: 13.3V (Min)
Package Type: DO-204AC / DO-15 axial through-hole
Bidirectional Channels: 1
Type: Zener TVS Diode
RoHS Compliance: ROHS3 Compliant

The substitute parts listed maintain these core electrical and mechanical specifications. Variations in clamping voltage (19.9V vs. 22V) and peak pulse current (25.1A to 25.6A vs. 22.7A) represent acceptable performance enhancements within the same functional category, as they provide equal or superior transient suppression capability while maintaining the same standoff and breakdown voltage thresholds.

Parameter Comparison

Parameter	SA12C-E3/73 (Main)	SA12CA-E3/73	SA12CA (Fairchild)	SA12CA-B (Littelfuse)	SA12CA-TP (MCC)
Manufacturer	Vishay	Vishay	Fairchild	Littelfuse	Micro Commercial Co
Product Status	Obsolete	Active	Obsolete	Active	Active
Voltage - Reverse Standoff (Typ)	12V	12V	12V	12V	12V
Voltage - Breakdown (Min)	13.3V	13.3V	13.3V	13.3V	13.3V
Voltage - Clamping (Max) @ Ipp	22V	19.9V	19.9V	19.9V	19.9V
Current - Peak Pulse (10/1000µs)	22.7A	25.1A	25.1A	25.6A	25.6A
Power - Peak Pulse	500W	500W	500W	500W	500W
Operating Temperature	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)	Not specified	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TA)
Package / Case	DO-204AC, DO-15	DO-204AC, DO-15	DO-15	DO-204AC, DO-15	DO-15
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: SA12CA-E3/73 (Vishay)

The SA12CA-E3/73 is the direct equivalent from the same manufacturer. It maintains identical standoff and breakdown voltage specifications while offering improved performance characteristics (lower clamping voltage of 19.9V and higher peak pulse current of 25.1A). This part is currently in active production status with substantial inventory availability (32,100 pcs), making it the preferred replacement for the obsolete SA12C-E3/73.

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

Both SA12CA-B and SA12CA-TP provide equivalent electrical performance with active product status. SA12CA-B is available in bulk packaging with 2,099 pcs in stock. SA12CA-TP is supplied in cut tape format with 1,361 pcs in stock. Both maintain the same voltage specifications and offer peak pulse current ratings of 25.6A, representing a marginal performance enhancement over the original part.

Alternative: SA12CA (Fairchild)

The SA12CA from Fairchild Semiconductor is electrically equivalent but carries obsolete product status. This part should be considered only when other active alternatives are unavailable. Inventory is limited to 6,400 pcs.

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can SA12CA-E3/73 be used as a direct replacement for SA12C-E3/73?

A: Yes. Both parts share identical reverse standoff voltage (12V), breakdown voltage (13.3V), and package specifications (DO-204AC / DO-15). The SA12CA-E3/73 offers superior performance with lower clamping voltage (19.9V vs. 22V) and higher peak pulse current (25.1A vs. 22.7A), making it a direct functional upgrade.

Q: What is the difference between SA12CA-E3/73, SA12CA-B, and SA12CA-TP?

A: These parts are electrically equivalent with identical voltage specifications. The differences are manufacturer (Vishay, Littelfuse, and Micro Commercial Co respectively) and packaging format (tape and reel, bulk, and cut tape). All maintain the same core electrical performance for transient voltage suppression.

Q: Are there package compatibility concerns when substituting?

A: All substitute parts use the DO-204AC or DO-15 axial through-hole package. Verify your PCB design accommodates the specific package variant (DO-204AC vs. DO-15) as specified by each manufacturer, though both are mechanically compatible with standard axial component footprints.

Q: Why does SA12CA-E3/73 have a lower clamping voltage than the original SA12C-E3/73?

A: The clamping voltage difference (19.9V vs. 22V) represents a performance variation within the same product family. Lower clamping voltage provides improved transient suppression, making SA12CA-E3/73 a performance-enhanced equivalent suitable for the same applications.

Q: Should I avoid obsolete parts like SA12CA (Fairchild)?

A: Obsolete parts carry supply chain risk due to limited remaining inventory and no ongoing production. Active alternatives (SA12CA-E3/73, SA12CA-B, SA12CA-TP) are preferred for new designs and ongoing procurement to ensure long-term component availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 rating, meeting standard environmental and manufacturing requirements.

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