SAC22 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SAC22 is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection applications. This unidirectional zener-type TVS diode operates with a 22V reverse standoff voltage and provides 35.4V maximum clamping voltage at peak pulse current. The component is housed in a DO-204AC (DO-15) axial through-hole package and is rated for 500W peak pulse power dissipation across an operating temperature range of -55°C to 175°C.

The SAC22 maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified to support component availability, supply chain flexibility, and design continuity in applications requiring identical or functionally compatible transient voltage suppression.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	24.4	V
Voltage - Clamping (Max) @ Ipp	35.4	V
Current - Peak Pulse (10/1000µs)	14	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

Substitute parts for the SAC22 are qualified based on strict electrical and mechanical parameter matching within allowable tolerances for TVS diode applications:

Primary Substitution Criteria:

Reverse standoff voltage: 22V (identical)
Breakdown voltage minimum: 24.4V (identical)
Clamping voltage maximum: 35.4V to 35.5V (within tolerance)
Peak pulse current: 14A to 14.1A (within tolerance)
Peak pulse power: 500W (identical)
Operating temperature range: -55°C to 175°C (identical)
Package type: DO-204AC (DO-15) axial through-hole (identical)
Unidirectional configuration: 1 channel (identical)

Substitute parts maintain identical functional performance within the specified electrical parameters and physical form factor, ensuring direct compatibility in circuit applications without design modification.

Parameter Comparison

Parameter	SAC22 (Littelfuse)	SAC22-E3/54 (Vishay)	SA22A-E3/54 (Vishay)
Voltage - Reverse Standoff (Typ)	22V	22V	22V
Voltage - Breakdown (Min)	24.4V	24.4V	24.4V
Voltage - Clamping (Max) @ Ipp	35.4V	35.4V	35.5V
Current - Peak Pulse (10/1000µs)	14A	14A	14.1A
Power - Peak Pulse	500W	500W	500W
Operating Temperature Range	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)	DO-204AC (DO-15)
Type	Zener	Zener	Zener
Unidirectional Channels	1	1	1
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All three parts—SAC22 (Littelfuse), SAC22-E3/54 (Vishay), and SA22A-E3/54 (Vishay)—maintain active product status with full RoHS3 compliance and REACH unaffected certification. Selection between these parts is based on supply chain availability and packaging format preference rather than electrical performance differentiation.

SAC22-E3/54 and SA22A-E3/54 are both Vishay TransZorb® series components with clamping voltages and peak pulse currents within acceptable tolerance bands (35.4V to 35.5V clamping voltage; 14A to 14.1A peak pulse current). All parts support identical through-hole mounting in DO-204AC (DO-15) axial packages and operate across the full -55°C to 175°C temperature range.

Component selection should prioritize availability, lead time, and cost considerations while maintaining compliance with RoHS3 and REACH regulatory requirements applicable to the end application.

Frequently Asked Questions (FAQ)

Q: Can SAC22-E3/54 be used as a direct replacement for SAC22?

A: Yes. SAC22-E3/54 maintains identical electrical specifications including 22V reverse standoff voltage, 24.4V minimum breakdown voltage, 35.4V maximum clamping voltage, and 14A peak pulse current. Both components are housed in DO-204AC (DO-15) axial through-hole packages and operate across -55°C to 175°C. Direct substitution requires no circuit modification.

Q: What is the difference between SA22A-E3/54 and SAC22-E3/54?

A: SA22A-E3/54 exhibits marginally higher clamping voltage (35.5V maximum versus 35.4V) and peak pulse current (14.1A versus 14A). These differences fall within acceptable tolerance bands for TVS diode applications and do not affect functional compatibility. Both are Vishay TransZorb® series components in identical DO-204AC (DO-15) packages.

Q: Are packaging differences between Tape & Reel (TR) and Cut Tape (CT) significant for substitution?

A: Packaging format (Tape & Reel versus Cut Tape) affects supply chain handling and component presentation but does not impact electrical performance or circuit compatibility. Component selection based on packaging format depends on assembly process requirements and inventory management practices rather than technical substitution criteria.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. SAC22, SAC22-E3/54, and SA22A-E3/54 are all RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity) ratings. All parts support identical regulatory and environmental compliance requirements for end-use applications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. All three parts maintain identical reverse standoff voltage (22V), breakdown voltage (24.4V minimum), operating temperature range (-55°C to 175°C), and through-hole mounting configuration (DO-204AC DO-15). Clamping voltage and peak pulse current variations (35.4V to 35.5V; 14A to 14.1A) are within acceptable tolerance bands and do not require design modification.

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