1SMA22AT3 Equivalent & Substitute Parts

Part Overview

The 1SMA22AT3 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by onsemi, rated for 22V reverse standoff voltage with 35.5V maximum clamping voltage at peak pulse current of 11.3A. The device is packaged in DO-214AC (SMA) surface mount configuration and is designed for general-purpose transient voltage suppression applications.

The 1SMA22AT3 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements.

Substiute Parts

1SMA22AT3

onsemiIn Stock: 8911SMA22AT3 Datasheet

Current PartRFQ

SMAJ22A

MDDIn Stock: 44967SMAJ22A Datasheet

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SMAJ22A

MDDIn Stock: 44967SMAJ22A Datasheet

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PTVS22VS1UR,115

Nexperia USA Inc.In Stock: 18971PTVS22VS1UR,115 Datasheet

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SM4T26AY

STMicroelectronicsIn Stock: 10776SM4T26AY Datasheet

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SMA6J22A-E3/5A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1124SMA6J22A-E3/5A Datasheet

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SMA6J22A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 881SMA6J22A-E3/61 Datasheet

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SMAJ22A-13-F

Diodes IncorporatedIn Stock: 45171SMAJ22A-13-F Datasheet

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SMAJ22A-TP

Micro Commercial CoIn Stock: 4117SMAJ22A-TP Datasheet

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SMAJ22AE3/TR13

Microchip TechnologyIn Stock: 978SMAJ22AE3/TR13 Datasheet

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SMAJ22E3/TR13

Microchip TechnologyIn Stock: 830SMAJ22E3/TR13 Datasheet

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TV04A220J-G

Comchip TechnologyIn Stock: 1173TV04A220J-G Datasheet

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TV04A220JB-G

Comchip TechnologyIn Stock: 20452TV04A220JB-G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMA22AT3 are classified based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:

Electrical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 22V
• Voltage - Breakdown (Min): 24.4V
• Unidirectional Channels: 1
• Type: Zener

Mechanical Parameters (Must Match):

• Package / Case: DO-214AC or SMA equivalent
• Mounting Type: Surface Mount

Secondary Parameters (Allowable Variation):

• Voltage - Clamping (Max) @ Ipp: 35.5V to 48.3V (higher clamping voltage provides additional margin)
• Current - Peak Pulse (10/1000µs): 11.2A to 89A (higher current rating provides design margin)
• Power - Peak Pulse: 400W to 4000W (higher power rating provides design margin)
• Operating Temperature Range: -55°C to 175°C (must encompass or match the original -65°C to 150°C range)

Parts are grouped into two categories:

Direct Equivalents: Identical electrical and mechanical specifications with active product status and modern RoHS compliance.

Similar Alternatives: Matching core electrical parameters (22V standoff, 24.4V breakdown) and package type, with allowable variations in clamping voltage, peak pulse current, or power rating that maintain circuit protection function.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Direct Electrical Equivalent:

SMAJ22A (MDD) is the preferred direct substitute. It maintains identical electrical specifications (22V standoff, 24.4V breakdown, 35.5V clamping, 11.3A peak pulse current, 400W power rating) and identical package configuration (DO-214AC, SMA). The part is active in production with ROHS3 compliance, ensuring long-term availability and regulatory compliance.

Alternative Direct Equivalents:

SMAJ22A-13-F (Diodes Incorporated) and SMAJ22A-TP (Micro Commercial Co) provide equivalent electrical performance with minor variations in peak pulse current (11.2A vs. 11.3A), which is within acceptable tolerance for the application. Both are active, ROHS3 compliant, and available in DO-214AC/SMA packaging.

Enhanced Performance Alternatives:

SMAJ22AE3/TR13 (Microchip Technology) and SMAJ22E3/TR13 (Microchip Technology) offer increased power dissipation (500W vs. 400W) and higher peak pulse current ratings (14.1A and 12.7A respectively), providing additional design margin while maintaining the same voltage specifications and package type.

SMA6J22A-E3/5A and SMA6J22A-E3/61 (Vishay General Semiconductor) provide significantly enhanced performance with 89A peak pulse current and 4000W power rating, suitable for applications requiring higher transient energy absorption. Clamping voltage is 40.4V, which is within acceptable range for 22V standoff applications.

Package Variant:

PTVS22VS1UR,115 (Nexperia USA Inc.) provides identical electrical specifications in SOD-123W package. This alternative is suitable only if PCB layout and design accommodate the different package footprint. The part is automotive-qualified (AEC-Q101) and active in production.

Compliance Consideration:

All recommended substitutes are ROHS3 compliant and carry REACH Unaffected status, meeting modern regulatory requirements. The original 1SMA22AT3 is RoHS non-compliant; migration to any active substitute ensures compliance with current environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can SMAJ22A directly replace 1SMA22AT3 without circuit modification?

A: Yes. SMAJ22A is a direct electrical and mechanical equivalent with identical voltage ratings (22V standoff, 24.4V breakdown, 35.5V clamping) and package configuration (DO-214AC, SMA). No circuit changes are required.

Q: What is the difference between parts with 35.5V clamping and 40.4V clamping?

A: Both maintain the same 22V standoff and 24.4V breakdown voltages. The clamping voltage difference reflects manufacturing variation and different peak pulse current ratings. Higher clamping voltage (40.4V) occurs with higher current ratings (89A vs. 11.3A). Both are acceptable substitutes for the original 22V standoff application.

Q: Why do some substitutes have different peak pulse current ratings (11.2A, 11.3A, 14.1A, 89A)?

A: Peak pulse current rating reflects the device's ability to absorb transient energy. Higher ratings provide additional design margin and are suitable for applications with higher transient stress. All listed substitutes with 22V standoff voltage are electrically compatible; selection depends on application transient severity.

Q: Is PTVS22VS1UR,115 in SOD-123W package compatible with the original SMA footprint?

A: No. SOD-123W is a different package footprint than DO-214AC (SMA). This part requires PCB redesign and is suitable only if layout modifications are acceptable. Use this alternative only when package change is feasible.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. All active substitutes listed are ROHS3 compliant. The original 1SMA22AT3 is RoHS non-compliant. Migration to any recommended substitute ensures compliance with current environmental regulations.

Q: Can I use SMA6J22A-E3/5A or SMA6J22A-E3/61 for general-purpose 22V suppression?

A: Yes. These Vishay parts maintain the required 22V standoff and 24.4V breakdown voltages. The significantly higher power rating (4000W vs. 400W) and peak pulse current (89A vs. 11.3A) provide substantial design margin. They are suitable for applications with higher transient energy or when enhanced reliability is required.

Q: What is the temperature operating range difference between substitutes?

A: The original 1SMA22AT3 operates from -65°C to 150°C (TJ). Most substitutes operate from -55°C to 150°C (TJ), which covers the same functional range for most applications. SMAJ22A-TP extends to 175°C (TA), providing additional high-temperature margin. Verify application temperature requirements before selection.

Q: Are Microchip SMAJ22AE3/TR13 and SMAJ22E3/TR13 interchangeable?

A: Both are Microchip products with identical 22V standoff and 24.4V breakdown voltages. SMAJ22AE3/TR13 has 35.5V clamping and 14.1A peak pulse current. SMAJ22E3/TR13 has 39.4V clamping and 12.7A peak pulse current. Both are suitable substitutes; selection depends on specific clamping voltage and current requirements.