SA14 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA14 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. Housed in a DO-204AC (DO-15) axial through-hole package, this component provides 14V reverse standoff voltage with a 24.36V maximum clamping voltage at peak pulse current of 22A.

The SA14 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	14	V
Voltage - Breakdown (Min)	14.76	V
Voltage - Clamping (Max) @ Ipp	24.36	V
Current - Peak Pulse (10/1000µs)	22	A
Power - Peak Pulse	500	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	DO-204AC (DO-15)	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SA14 is determined by strict equivalence across the following critical parameters:

Voltage Rating: Reverse standoff voltage of 14V and breakdown voltage minimum of 14.76V
Clamping Voltage: Maximum clamping voltage at peak pulse current (Ipp)
Peak Pulse Current: 22A at 10/1000µs pulse duration
Power Dissipation: 500W peak pulse power rating
Package: DO-204AC (DO-15) axial through-hole configuration
Device Type: Unidirectional Zener TVS diode
Operating Temperature: -55°C to 175°C junction temperature range

The substitute parts identified (SA14A, SA14A-B, SA14A-AP, SA14A-BP, SA14A-TP) maintain electrical equivalence across these parameters. Variations in clamping voltage (23.2V vs. 24.36V) and breakdown voltage (15.6V vs. 14.76V) remain within acceptable tolerance ranges for general-purpose transient suppression applications while preserving functional compatibility.

Parameter Comparison

Parameter	SA14 (Littelfuse)	SA14A (Fairchild)	SA14A-B (Littelfuse)	SA14A-AP (MCC)	SA14A-BP (MCC)	SA14A-TP (MCC)
Voltage - Reverse Standoff (Typ)	14V	14V	14V	14V	14V	14V
Voltage - Breakdown (Min)	14.76V	15.6V	15.6V	15.6V	15.6V	15.6V
Voltage - Clamping (Max) @ Ipp	24.36V	23.2V	23.2V	23.2V	23.2V	23.2V
Current - Peak Pulse (10/1000µs)	22A	22A	22A	22A	22A	22A
Power - Peak Pulse	500W	500W	500W	500W	500W	500W
Operating Temperature	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)	DO-204AC (DO-15)	DO-15	DO-15	DO-15
Type	Zener	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified	Not specified
Product Status	Obsolete	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: SA14A-B (Littelfuse Inc.)

SA14A-B is the manufacturer-recommended substitute. It maintains active product status, ensuring long-term availability and supply chain stability. As a Littelfuse product, it preserves design continuity with the original SA14. ROHS3 compliance and REACH unaffected status confirm regulatory alignment. Electrical parameters remain functionally equivalent for general-purpose transient suppression.

Secondary Alternatives: SA14A-AP, SA14A-BP, SA14A-TP (Micro Commercial Co)

These three variants from Micro Commercial Co are electrically equivalent and maintain active product status. All three share identical electrical specifications and operating temperature ranges. Selection among these three should be based on packaging availability and supply chain logistics. REACH unaffected status confirms regulatory compliance.

Tertiary Alternative: SA14A (Fairchild Semiconductor)

SA14A provides electrical equivalence but carries obsolete product status. This part should be considered only when other active alternatives are unavailable, as obsolete classification indicates discontinued manufacturing and limited future availability.

Frequently Asked Questions (FAQ)

Q: Can SA14A-B directly replace SA14 in existing designs?

A: Yes. SA14A-B maintains electrical equivalence across all critical parameters: 14V reverse standoff voltage, 22A peak pulse current, 500W peak pulse power, and DO-204AC (DO-15) through-hole package. The slight difference in clamping voltage (23.2V vs. 24.36V) and breakdown voltage (15.6V vs. 14.76V) remains within acceptable tolerance for general-purpose transient suppression applications.

Q: What is the difference between SA14A-AP, SA14A-BP, and SA14A-TP?

A: These three Micro Commercial Co variants are electrically identical. Differences are limited to packaging designations and supplier-specific part numbering conventions. Selection should be based on availability and supply chain preference.

Q: Why is SA14A listed as obsolete if it is a substitute?

A: SA14A (Fairchild Semiconductor) is included as a historical equivalent but carries obsolete status. It should not be selected for new designs or long-term production. Active alternatives (SA14A-B, SA14A-AP, SA14A-BP, SA14A-TP) are preferred.

Q: Are all substitute parts ROHS3 compliant?

A: SA14A-B is confirmed ROHS3 compliant. Compliance status for SA14A-AP, SA14A-BP, and SA14A-TP is not specified in available documentation. Verify with suppliers if ROHS3 compliance is a design requirement.

Q: Can these parts be used in surface-mount applications?

A: No. All parts in this family, including SA14 and its substitutes, are through-hole axial components in DO-204AC (DO-15) packages. They are not suitable for surface-mount assembly.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: SA14A-B specifies MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. MSL data for SA14A-AP, SA14A-BP, and SA14A-TP is not provided in available documentation.

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