1SMA22AT3G Equivalent & Substitute Parts

Part Overview

The 1SMA22AT3G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AC (SMA) surface mount package. This component is rated for 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 11.3A peak pulse current. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMA22AT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	22V
Voltage - Breakdown (Min)	24.4V
Voltage - Clamping (Max) @ Ipp	35.5V
Current - Peak Pulse (10/1000µs)	11.3A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 1SMA22AT3G are grouped into two categories based on electrical performance characteristics:

Category 1: Direct Electrical Equivalents (35.5V Clamping Voltage) These parts maintain identical voltage specifications and peak pulse current ratings, ensuring drop-in compatibility for standard transient suppression applications:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Voltage - Clamping (Max) @ Ipp: 35.5V
Current - Peak Pulse (10/1000µs): 11.3A (±0.1A tolerance)
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA

Category 2: Enhanced Performance Alternatives (Higher Clamping Voltage) These parts share the same reverse standoff voltage and breakdown voltage but feature higher clamping voltage and significantly increased peak pulse current, suitable for applications requiring greater transient energy absorption:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Voltage - Clamping (Max) @ Ipp: 40.4V or 48.3V
Current - Peak Pulse (10/1000µs): 48A to 89A
Power - Peak Pulse: 400W to 4000W
Package / Case: DO-214AC, SMA

Parameter Comparison

Part Number	Manufacturer	Status	VWM (Typ)	VBR (Min)	VC (Max)	Ipp	Power	Temp Range	Package
1SMA22AT3G	Littelfuse Inc.	Obsolete	22V	24.4V	35.5V	11.3A	400W	-65°C ~ 150°C	DO-214AC, SMA
SMAJ22A	MDD	Active	22V	24.4V	35.5V	11.3A	400W	-50°C ~ 150°C	DO-214AC, SMA
SMAJ22A-E3/5A	Vishay General Semiconductor - Diodes Division	Active	22V	24.4V	35.5V	11.3A	400W	-55°C ~ 150°C	DO-214AC, SMA
SMAJ22A-E3/61	Vishay General Semiconductor - Diodes Division	Active	22V	24.4V	35.5V	11.3A	400W	-55°C ~ 150°C	DO-214AC, SMA
SMAJ22A-M3/61	Vishay General Semiconductor - Diodes Division	Active	22V	24.4V	35.5V	11.3A	400W	-55°C ~ 150°C	DO-214AC, SMA
SMAJ22A-13-F	Diodes Incorporated	Active	22V	24.4V	35.5V	11.2A	400W	-55°C ~ 150°C	DO-214AC, SMA
SMAJ22A-TP	Micro Commercial Co	Active	22V	24.4V	35.5V	11.2A	400W	-55°C ~ 175°C	DO-214AC, SMA
SM4T26AY	STMicroelectronics	Active	22V	24.4V	48.3V	48A (8/20µs)	400W	-55°C ~ 150°C	DO-214AC, SMA
SMA6J22A-E3/5A	Vishay General Semiconductor - Diodes Division	Active	22V	24.4V	40.4V	89A (8/20µs)	4000W	-55°C ~ 150°C	DO-214AC, SMA
SMA6J22A-E3/61	Vishay General Semiconductor - Diodes Division	Active	22V	24.4V	40.4V	89A (8/20µs)	4000W	-55°C ~ 150°C	DO-214AC, SMA

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): Select from SMAJ22A (MDD), SMAJ22A-E3/5A, SMAJ22A-E3/61, SMAJ22A-M3/61, SMAJ22A-13-F, or SMAJ22A-TP. All are active products with ROHS3 compliance and REACH unaffected status. These parts maintain the 35.5V clamping voltage and 11.3A peak pulse current specifications of the original 1SMA22AT3G. Packaging options include Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats for manufacturing flexibility.

For Enhanced Transient Protection: SM4T26AY (STMicroelectronics) provides automotive-grade qualification (AEC-Q101) with 48.3V clamping voltage and 48A peak pulse current. SMA6J22A-E3/5A and SMA6J22A-E3/61 (Vishay) offer 40.4V clamping voltage with 89A peak pulse current and 4000W power rating. These alternatives are suitable for applications requiring higher transient energy absorption while maintaining the same 22V reverse standoff voltage.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ22A-13-F be used as a direct replacement for 1SMA22AT3G? A: Yes. SMAJ22A-13-F maintains identical voltage specifications (22V standoff, 24.4V breakdown, 35.5V clamping) and equivalent peak pulse current (11.2A versus 11.3A). The part is active, ROHS3 compliant, and available in DO-214AC (SMA) package.

Q: What is the difference between SMAJ22A-E3/5A and SMAJ22A-E3/61? A: Both parts are electrically identical with 35.5V clamping voltage and 11.3A peak pulse current. The difference is packaging format: SMAJ22A-E3/5A is supplied in Tape & Reel (TR), while SMAJ22A-E3/61 is supplied in Cut Tape (CT) & Digi-Reel® format. Inventory availability differs (949 Pcs versus 32,038 Pcs).

Q: When should SMA6J22A-E3/5A be selected instead of SMAJ22A? A: SMA6J22A-E3/5A is selected when the application requires higher transient energy absorption. It provides 40.4V clamping voltage (versus 35.5V) and 89A peak pulse current (versus 11.3A) with 4000W power rating (versus 400W). This is suitable for industrial or high-energy transient environments while maintaining the same 22V reverse standoff voltage.

Q: Is SM4T26AY suitable for automotive applications? A: Yes. SM4T26AY carries AEC-Q101 automotive qualification and is rated for -55°C to 150°C operating temperature. It provides 48.3V clamping voltage and 48A peak pulse current, making it appropriate for automotive transient suppression with enhanced performance margins.

Q: Are all substitute parts available in the same DO-214AC (SMA) package? A: Yes. All substitute parts listed are available in DO-214AC (SMA) surface mount package, ensuring mechanical and thermal compatibility with the original 1SMA22AT3G footprint.

Q: What is the temperature range difference between 1SMA22AT3G and its substitutes? A: The original 1SMA22AT3G operates from -65°C to 150°C (TJ). Most active substitutes operate from -55°C to 150°C (TJ), except SMAJ22A-TP which extends to -55°C to 175°C (TA). For applications requiring the full -65°C lower limit, verify thermal design margins with the selected substitute.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message