SA22A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA22A is a unidirectional Zener-type transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. The device features a 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 14.1A peak pulse current capability in a through-hole DO-15 package. The SA22A is currently classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	24.4	V
Voltage - Clamping (Max) @ Ipp	35.5	V
Current - Peak Pulse (10/1000µs)	14.1	A
Power - Peak Pulse	500	W
Type	Zener	-
Unidirectional Channels	1	-
Mounting Type	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	-

Substitute Part Grouping Explanation

Substitution eligibility for the SA22A is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Voltage - Clamping (Max) @ Ipp: 35.5V
Current - Peak Pulse (10/1000µs): 14.1A (±0.3A tolerance acceptable)
Power - Peak Pulse: 500W
Type: Zener
Unidirectional Channels: 1
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, or Axial equivalent

Parts are classified as direct equivalents when all electrical parameters match exactly. Parts are classified as similar when electrical parameters are identical but packaging or supplier device specifications differ. All substitute parts listed maintain functional equivalence for general-purpose transient voltage suppression applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vwm (Typ) [V]	Vbr (Min) [V]	Vc (Max) @ Ipp [V]	Ipp [A]	Ppk [W]	Package	Operating Temp [°C]
SA22A	onsemi	Obsolete	22	24.4	35.5	14.1	500	DO-15	-
SA22A-E3/54	Vishay General Semiconductor	Active	22	24.4	35.5	14.1	500	DO-204AC (DO-15)	-55 to 175
SA22AHE3/54	Vishay General Semiconductor	Active	22	24.4	35.5	14.1	500	DO-204AC (DO-15)	-55 to 175
P5KE22A-AP	Micro Commercial Co	Active	22	24.4	35.5	14.1	500	DO-15	-65 to 175
P5KE22A-BP	Micro Commercial Co	Active	22	24.4	35.5	14.1	500	DO-15	-65 to 175
P5KE22A-TP	Micro Commercial Co	Active	22	24.4	35.5	14.1	500	DO-15	-65 to 175
SA22A	Fairchild Semiconductor	Obsolete	22	24.4	35.5	14.4	500	DO-204AC (DO-15)	-55 to 175

Engineering Selection Recommendations

For active production designs requiring SA22A replacement, the Vishay SA22A-E3/54 (Cut Tape packaging) or SA22AHE3/54 (Tape & Reel packaging, AEC-Q101 automotive qualified) are the primary direct equivalents. Both parts are manufactured by Vishay General Semiconductor and maintain identical electrical specifications with ROHS3 compliance and active product status.

The Micro Commercial Co P5KE22A series (P5KE22A-AP, P5KE22A-BP, P5KE22A-TP) provides functional equivalence with extended lower operating temperature range (-65°C vs. -55°C minimum). These parts are suitable for applications requiring broader temperature performance.

The Fairchild Semiconductor SA22A variant is obsolete and not recommended for new designs despite electrical equivalence.

For automotive applications requiring qualification documentation, the SA22AHE3/54 with AEC-Q101 qualification is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can SA22A-E3/54 be used as a direct replacement for the onsemi SA22A?

A: Yes. The SA22A-E3/54 manufactured by Vishay maintains identical electrical parameters (22V standoff, 24.4V breakdown minimum, 35.5V clamping maximum, 14.1A peak pulse current, 500W peak power) and is pin-compatible in DO-15 through-hole applications. The SA22A-E3/54 is active and ROHS3 compliant.

Q: What is the difference between SA22A-E3/54 and SA22AHE3/54?

A: Both parts are electrically identical. The primary difference is packaging format: SA22A-E3/54 is supplied in Cut Tape (CT), while SA22AHE3/54 is supplied in Tape & Reel (TR). The SA22AHE3/54 carries AEC-Q101 automotive qualification and is suitable for automotive-grade applications.

Q: Are the Micro Commercial Co P5KE22A variants fully equivalent to SA22A?

A: The P5KE22A-AP, P5KE22A-BP, and P5KE22A-TP maintain identical electrical specifications and are functionally equivalent for transient voltage suppression. All three variants feature extended lower operating temperature range (-65°C minimum vs. -55°C). Selection among the three variants depends on packaging and supplier requirements.

Q: What packaging formats are available for SA22A substitutes?

A: Vishay offers DO-204AC (DO-15) axial through-hole packages in both Cut Tape and Tape & Reel formats. Micro Commercial Co P5KE22A variants are supplied in bulk DO-15 packages. All packages are mechanically and electrically compatible for through-hole PCB applications.

Q: Is RoHS compliance required for SA22A substitution?

A: The Vishay SA22A-E3/54 and SA22AHE3/54 are ROHS3 compliant. The onsemi SA22A and Fairchild SA22A do not specify RoHS status. For applications requiring RoHS compliance, Vishay parts are the appropriate selection.

Q: Can SA22A be used in automotive applications?

A: The SA22AHE3/54 is qualified to AEC-Q101 automotive standards and is suitable for automotive applications. The standard SA22A-E3/54 does not carry automotive qualification. The Micro Commercial Co P5KE22A variants do not specify automotive qualification.

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