SMAJ48A Equivalent & Substitute Parts

Part Overview

The SMAJ48A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation, designed for general-purpose overvoltage protection applications. This surface-mount component operates in the DO-214AC (SMA) package and features a 48V reverse standoff voltage with a 77.4V maximum clamping voltage at peak pulse current. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements across multiple manufacturers.

Substiute Parts

SMAJ48A

Taiwan Semiconductor CorporationIn Stock: 202166SMAJ48A Datasheet

Current PartRFQ

SMAJ48A-TP

Micro Commercial CoIn Stock: 5986SMAJ48A-TP Datasheet

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ATV04A480J-HF

Comchip TechnologyIn Stock: 1894ATV04A480J-HF Datasheet

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SMAJ48A

MDDIn Stock: 202171SMAJ48A Datasheet

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SMAJ48A

MDDIn Stock: 202171SMAJ48A Datasheet

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SMAJ48A-13-F

Diodes IncorporatedIn Stock: 4290SMAJ48A-13-F Datasheet

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SMAJ48A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 214171SMAJ48A-E3/61 Datasheet

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SMAJ48A-Q

Bourns Inc.In Stock: 9714SMAJ48A-Q Datasheet

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SMAJ48A-TR

STMicroelectronicsIn Stock: 2557SMAJ48A-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ48A are classified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

• Voltage - Reverse Standoff: 48V (Typ)
• Voltage - Clamping (Max) @ Ipp: 77.4V
• Current - Peak Pulse (10/1000µs): 5.2A (±tolerance)
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Type: Zener, Unidirectional (1 channel)
• Operating Temperature: -55°C minimum to 150°C maximum

Parts meeting all critical parameters are classified as direct equivalents. Parts with identical electrical specifications but different packaging formats (Tape & Reel versus bulk) are functionally equivalent for circuit design purposes. Parts with minor variations in peak pulse current (within 5% tolerance) or extended temperature ranges are listed as compatible alternatives. Parts with significantly different clamping voltages, peak pulse currents, or package types are not included as substitutes.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Specifications):

The following parts are direct functional equivalents with matching 48V reverse standoff, 77.4V clamping voltage, and 5.2A peak pulse current specifications:

• SMAJ48A-13-F (Diodes Incorporated): Identical electrical parameters with -55°C to 150°C operating range. Tape & Reel packaging. Active production status with RoHS3 compliance.
• SMAJ48A-E3/61 (Vishay General Semiconductor - Diodes Division): Identical electrical parameters with -55°C to 150°C operating range. Tape & Reel packaging. TransZorb® series designation. Active production status with RoHS3 compliance.
• SMAJ48A-Q (Bourns Inc.): Identical electrical parameters with -55°C to 150°C operating range. Tape & Reel packaging. AEC-Q101 automotive qualification. Active production status with RoHS3 compliance.
• SMAJ48A (MDD): Identical electrical parameters with -50°C to 150°C operating range. Bulk packaging. Active production status with RoHS3 compliance.

Extended Temperature Range Alternative:

• SMAJ48A-TP (Micro Commercial Co): Identical electrical parameters with extended upper operating temperature of -55°C to 175°C (TA). Tape & Reel packaging. Active production status with RoHS3 compliance. Suitable for applications requiring higher ambient temperature tolerance.

Automotive-Qualified Alternative:

• ATV04A480J-HF (Comchip Technology): Meets electrical specifications with 5.17A peak pulse current (within tolerance of 5.2A specification). AEC-Q101 automotive qualification. Automotive grade designation. -55°C to 150°C operating range. Tape & Reel packaging. Active production status with RoHS3 compliance.

Non-Equivalent Part (Different Electrical Specifications):

• SMAJ48A-TR (STMicroelectronics): This part has significantly different electrical characteristics with 100V clamping voltage and 23A peak pulse current (8/20µs pulse definition). This part is not a direct substitute and is listed only for reference. Selection requires circuit re-evaluation.

All recommended substitutes maintain RoHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and active production status. Selection between equivalent parts should be based on packaging format requirements (bulk versus Tape & Reel), temperature range specifications, and manufacturer availability.

Frequently Asked Questions (FAQ)

Q: Can SMAJ48A-TP be used as a direct replacement for SMAJ48A?

A: Yes. SMAJ48A-TP is electrically identical with matching 48V reverse standoff, 77.4V clamping voltage, and 5.2A peak pulse current. The primary difference is packaging format (Tape & Reel versus bulk) and extended upper operating temperature (175°C versus 150°C). For applications operating within -55°C to 150°C, both parts are functionally equivalent.

Q: What is the difference between SMAJ48A-E3/61 and SMAJ48A-13-F?

A: Both parts have identical electrical specifications (48V standoff, 77.4V clamping, 5.2A peak pulse current) and operating temperature range (-55°C to 150°C). The differences are manufacturer (Vishay versus Diodes Incorporated) and part number suffix conventions. Selection between these parts depends on supplier availability and procurement preferences.

Q: Is ATV04A480J-HF a suitable substitute?

A: ATV04A480J-HF is compatible for most applications. It meets the 48V reverse standoff and 77.4V clamping voltage specifications with 5.17A peak pulse current (within tolerance of the 5.2A specification). The primary distinction is AEC-Q101 automotive qualification and automotive grade designation, making it suitable for automotive applications. Operating temperature range matches at -55°C to 150°C.

Q: Why is SMAJ48A-TR not recommended as a substitute?

A: SMAJ48A-TR has significantly different electrical characteristics. The clamping voltage is 100V (versus 77.4V) and peak pulse current is 23A with 8/20µs pulse definition (versus 5.2A with 10/1000µs definition). These differences represent a different device class and require circuit re-evaluation. This part is not a direct substitute.

Q: What packaging formats are available?

A: The SMAJ48A series is available in multiple packaging formats: bulk (standard), Tape & Reel (TR), and Cut Tape with Digi-Reel. All formats use the same DO-214AC (SMA) physical package. Selection depends on assembly equipment compatibility and procurement volume requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original SMAJ48A specifications.

Q: Which substitute part has automotive qualification?

A: SMAJ48A-Q (Bourns Inc.) and ATV04A480J-HF (Comchip Technology) both carry AEC-Q101 automotive qualification. SMAJ48A-Q is designated as SMAJ-Q series for automotive applications. ATV04A480J-HF carries automotive grade designation.

Q: Can I use MDD SMAJ48A as a substitute?

A: Yes. MDD SMAJ48A is electrically identical with 48V reverse standoff, 77.4V clamping voltage, and 5.2A peak pulse current. The operating temperature range is -50°C to 150°C (versus -55°C for the original part). For applications not requiring operation below -50°C, this part is functionally equivalent.