1SMA22CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMA22CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 400W peak pulse power rating in a DO-214AC (SMA) package. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

1SMA22CAT3

onsemiIn Stock: 10261SMA22CAT3 Datasheet

Current PartRFQ

SMAJ22CA

MDDIn Stock: 31205SMAJ22CA Datasheet

DirectRFQ

SMAJ22CA

MDDIn Stock: 31205SMAJ22CA Datasheet

DirectRFQ

SM4T26CAY

STMicroelectronicsIn Stock: 2396SM4T26CAY Datasheet

SimilarRFQ

SMAJ22CA-13-F

Diodes IncorporatedIn Stock: 4615SMAJ22CA-13-F Datasheet

SimilarRFQ

SMAJ22CA-TP

Micro Commercial CoIn Stock: 5291SMAJ22CA-TP Datasheet

SimilarRFQ

SMAJ22CAE3/TR13

Microchip TechnologyIn Stock: 941SMAJ22CAE3/TR13 Datasheet

SimilarRFQ

TV04A220JB-G

Comchip TechnologyIn Stock: 20452TV04A220JB-G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMA22CAT3 is determined by the following critical parameters:

Primary Matching Criteria:

• Voltage - Reverse Standoff (Typ): 22V
• Voltage - Breakdown (Min): 24.4V
• Voltage - Clamping (Max) @ Ipp: 35.5V
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

Secondary Compatibility Factors:

• Power - Peak Pulse: 400W (minimum acceptable)
• Operating Temperature Range: Must encompass application requirements
• Product Status: Active preferred for long-term availability

Substitute parts are grouped into two categories:

Direct Equivalents: Parts matching all primary criteria with identical electrical performance (SMAJ22CA, SMAJ22CA-13-F, SMAJ22CA-TP, SMAJ22CAE3/TR13, TV04A220JB-G). These provide pin-for-pin and functional compatibility.

Similar Alternatives: Parts meeting primary voltage and package criteria but with variations in secondary parameters (SM4T26CAY). These require application-level verification of performance differences.

Parameter Comparison

Engineering Selection Recommendations

Preferred Direct Equivalents:

SMAJ22CA (MDD) and TV04A220JB-G (Comchip) are the primary recommended substitutes. Both are active products with ROHS3 compliance, matching electrical specifications, and high inventory availability. SMAJ22CA offers the largest stock position (31,141 units), ensuring supply continuity. TV04A220JB-G provides equivalent performance with 20,400 units in stock.

SMAJ22CA-TP (Micro Commercial Co) is suitable for applications requiring extended operating temperature to 175°C. SMAJ22CAE3/TR13 (Microchip) offers increased peak pulse power (500W) and higher peak pulse current (14.1A), providing additional margin for transient protection.

SMAJ22CA-13-F (Diodes Incorporated) provides direct equivalence with active product status and 4,590 units available.

Alternative Consideration:

SM4T26CAY (STMicroelectronics) presents a similar alternative with higher clamping voltage (48.3V) and significantly higher peak pulse current (48A at 8/20µs). This part is suitable only when higher transient current handling is required and the elevated clamping voltage is acceptable for the application. AEC-Q101 automotive qualification is available if required.

Compliance Note:

All recommended substitutes are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete 1SMA22CAT3. Designs requiring RoHS compliance must transition to one of the active substitute parts.

Frequently Asked Questions (FAQ)

Q: Can SMAJ22CA directly replace 1SMA22CAT3 without circuit modification?

A: Yes. SMAJ22CA matches all critical electrical parameters: 22V reverse standoff, 24.4V breakdown minimum, and 35.5V maximum clamping voltage. The DO-214AC (SMA) package is identical. No circuit changes are required.

Q: What is the difference between SMAJ22CA-TP and other SMAJ22CA variants?

A: SMAJ22CA-TP extends the operating temperature range to 175°C (ambient), compared to 150°C junction temperature for other variants. Select this variant only if your application requires operation above 150°C.

Q: Why does SM4T26CAY have a higher clamping voltage (48.3V) than the original part?

A: SM4T26CAY is a similar alternative, not a direct equivalent. The 48.3V clamping voltage is higher than the 35.5V specification of 1SMA22CAT3. Use this part only if your circuit design can tolerate higher clamping voltage and requires the higher peak pulse current (48A).

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitutes carry ROHS3 compliance certification. The original 1SMA22CAT3 is RoHS non-compliant. Transition to any active substitute to meet RoHS requirements.

Q: What is the difference between peak pulse current specifications (10/1000µs vs. 8/20µs)?

A: These represent different pulse waveform standards. The 10/1000µs waveform is standard for TVS diode ratings. SM4T26CAY specifies 8/20µs, which is an alternative pulse definition. For direct comparison, use parts specifying the same pulse waveform standard.

Q: Which substitute offers the best long-term availability?

A: SMAJ22CA (MDD) with 31,141 units in stock and active product status provides the strongest supply position. TV04A220JB-G (Comchip) with 20,400 units is the secondary choice.

Q: Can I use SMAJ22CAE3/TR13 for increased protection margin?

A: Yes. SMAJ22CAE3/TR13 provides 500W peak pulse power (versus 400W) and 14.1A peak pulse current (versus ~11.3A typical for other variants). This offers additional transient protection margin while maintaining identical voltage specifications. Use this variant when design margin is a priority.