SMAJ20A-TP Equivalent & Substitute Parts

Part Overview

The SMAJ20A-TP is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose transient voltage protection in surface-mount applications. This component operates with a 20V reverse standoff voltage and provides 32.4V maximum clamping voltage at peak pulse current of 12.3A. The part is actively produced, RoHS3 compliant, and available in DO-214AC (SMA) packaging with Tape & Reel distribution.

Equivalent and substitute parts are identified based on matching electrical performance parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, power dissipation, and operating temperature range. Substitute selection ensures functional interchangeability within the specified electrical and mechanical constraints.

Substiute Parts

SMAJ20A-TP

Micro Commercial CoIn Stock: 5476SMAJ20A-TP Datasheet

Current PartRFQ

SMAJ20A

MDDIn Stock: 25085SMAJ20A Datasheet

DirectRFQ

SMAJ20A

MDDIn Stock: 25085SMAJ20A Datasheet

DirectRFQ

SMAJ20A-13-F

Diodes IncorporatedIn Stock: 25231SMAJ20A-13-F Datasheet

DirectRFQ

SMAJ20A-E3/5A

Vishay General Semiconductor - Diodes DivisionIn Stock: 7646SMAJ20A-E3/5A Datasheet

DirectRFQ

SMAJ20A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 29308SMAJ20A-E3/61 Datasheet

DirectRFQ

SZ1SMA20AT3G

onsemiIn Stock: 16020SZ1SMA20AT3G Datasheet

DirectRFQ

SM4T23AY

STMicroelectronicsIn Stock: 5922SM4T23AY Datasheet

SimilarRFQ

SMA6J20A-TR

STMicroelectronicsIn Stock: 5150SMA6J20A-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ20A-TP are classified into two categories based on electrical parameter alignment:

Direct Substitutes maintain identical electrical specifications across all critical parameters: 20V reverse standoff voltage, 22.2V minimum breakdown voltage, 32.4V maximum clamping voltage, and 12.3A peak pulse current. These parts are functionally equivalent and interchangeable in circuit applications. Direct substitutes include SMAJ20A (MDD), SMAJ20A-13-F (Diodes Incorporated), SMAJ20A-E3/5A (Vishay), and SMAJ20A-E3/61 (Vishay).

Similar Substitutes share the same reverse standoff voltage (20V) and breakdown voltage (22.2V) but differ in clamping voltage and peak pulse current specifications. These parts provide alternative protection characteristics suitable for applications with different transient energy requirements. Similar substitutes include SM4T23AY (STMicroelectronics, 42.8V clamp, 54A peak pulse) and SMA6J20A-TR (STMicroelectronics, 36.8V clamp, 93A peak pulse, 600W power).

The part SZ1SMA20AT3G (onsemi) is listed as a similar substitute but lacks complete electrical parameter documentation in the provided data.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Electrical Equivalents):

SMAJ20A-E3/5A and SMAJ20A-E3/61 from Vishay General Semiconductor are direct electrical equivalents with identical voltage and current specifications. Both are RoHS3 compliant, actively produced, and available in standard Tape & Reel packaging. The primary difference is inventory availability (7,600 units for E3/5A versus 29,200 units for E3/61).

SMAJ20A-13-F from Diodes Incorporated provides direct electrical equivalence with Cut Tape & Digi-Reel packaging option, offering 25,200 units in stock. Operating temperature range is -55°C to 150°C (TJ), which is narrower than the original part's -55°C to 175°C (TA) specification.

SMAJ20A from MDD provides direct electrical equivalence but with a narrower operating temperature range of -50°C to 150°C (TJ), which may not be suitable for applications requiring the full -55°C lower temperature limit.

Similar Substitutes (Higher Performance Variants):

SMA6J20A-TR from STMicroelectronics offers increased peak pulse current (93A versus 12.3A) and power dissipation (600W versus 400W) while maintaining the same 20V reverse standoff voltage. Clamping voltage is 36.8V, providing higher transient energy absorption. Operating temperature extends to 175°C (TJ), matching the original part's upper limit. This part is suitable for applications requiring enhanced transient protection.

SM4T23AY from STMicroelectronics provides automotive-grade qualification (AEC-Q101) with significantly higher peak pulse current (54A) and clamping voltage (42.8V). This part is appropriate for automotive and high-reliability applications with stringent transient protection requirements.

All substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can SMAJ20A-E3/5A and SMAJ20A-E3/61 be used interchangeably with SMAJ20A-TP?

A: Yes. Both Vishay parts are direct electrical equivalents with identical voltage (20V standoff, 22.2V breakdown, 32.4V clamp) and current (12.3A peak pulse) specifications. Both are RoHS3 compliant and packaged in DO-214AC (SMA) format. The difference is inventory availability and internal manufacturing code (E3/5A versus E3/61).

Q: What is the difference between SMAJ20A-13-F and SMAJ20A-TP?

A: SMAJ20A-13-F from Diodes Incorporated is electrically identical to SMAJ20A-TP with the same 20V standoff, 22.2V breakdown, and 32.4V clamping specifications. The primary difference is packaging format: SMAJ20A-13-F is available in Cut Tape & Digi-Reel, while SMAJ20A-TP is supplied in Tape & Reel. Operating temperature range is -55°C to 150°C (TJ) versus -55°C to 175°C (TA) for the original part.

Q: When should SMA6J20A-TR be selected instead of SMAJ20A-TP?

A: SMA6J20A-TR should be selected when applications require higher transient energy absorption. This part provides 93A peak pulse current (versus 12.3A) and 600W power dissipation (versus 400W), with a clamping voltage of 36.8V. The reverse standoff voltage remains 20V, maintaining circuit compatibility. Operating temperature extends to 175°C (TJ), matching the original part's upper limit.

Q: Is SM4T23AY suitable as a substitute for SMAJ20A-TP?

A: SM4T23AY is a similar substitute with the same 20V reverse standoff voltage but higher clamping voltage (42.8V) and peak pulse current (54A). This part includes automotive-grade qualification (AEC-Q101) and is appropriate for automotive and high-reliability applications. The higher clamping voltage may affect circuit behavior in sensitive applications; circuit validation is necessary for non-automotive use.

Q: What is the impact of operating temperature range differences between substitutes?

A: SMAJ20A-TP operates from -55°C to 175°C (TA). Some substitutes (SMAJ20A from MDD, SMAJ20A-13-F from Diodes) have narrower ranges (-50°C to 150°C or -55°C to 150°C). For applications requiring full -55°C to 175°C operation, select SMAJ20A-E3/5A, SMAJ20A-E3/61, or SMA6J20A-TR.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and storage conditions.

Q: What packaging options are available for direct substitutes?

A: Direct electrical equivalents are available in multiple packaging formats: Tape & Reel (SMAJ20A-E3/5A, SMAJ20A-E3/61), Cut Tape & Digi-Reel (SMAJ20A-13-F), and standard packaging (SMAJ20A from MDD). Select based on assembly line requirements and inventory management preferences.