SMAJ48A-13 Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The SMAJ48A-13 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Diodes Incorporated in the DO-214AC (SMA) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 48V reverse standoff voltage and 77.4V maximum clamping voltage at peak pulse current.

The SMAJ48A-13 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or comparable electrical characteristics and the same surface mount package footprint, ensuring direct functional replacement in circuit designs.

Substiute Parts

SMAJ48A-13

Diodes IncorporatedIn Stock: 1090SMAJ48A-13 Datasheet

Current PartRFQ

SMAJ48A-13-F

Diodes IncorporatedIn Stock: 4290SMAJ48A-13-F Datasheet

DirectRFQ

ATV04A480J-HF

Comchip TechnologyIn Stock: 1894ATV04A480J-HF Datasheet

MFR RecommendedRFQ

PTVS48VS1UR,115

Nexperia USA Inc.In Stock: 19055PTVS48VS1UR,115 Datasheet

MFR RecommendedRFQ

SMAJ48A

MDDIn Stock: 202171SMAJ48A Datasheet

MFR RecommendedRFQ

SMAJ48A-E3/61

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

MFR RecommendedRFQ

SMAJ48A-Q

Bourns Inc.In Stock: 9714SMAJ48A-Q Datasheet

MFR RecommendedRFQ

SMAJ48A-TP

Micro Commercial CoIn Stock: 5986SMAJ48A-TP Datasheet

MFR RecommendedRFQ

SMAJ48A-TR

STMicroelectronicsIn Stock: 2557SMAJ48A-TR Datasheet

MFR RecommendedRFQ

SMAJ48AHR3G

Taiwan Semiconductor CorporationIn Stock: 4035SMAJ48AHR3G Datasheet

MFR RecommendedRFQ

SMAJ48HR3G

Taiwan Semiconductor CorporationIn Stock: 4353SMAJ48HR3G Datasheet

MFR RecommendedRFQ

SZ1SMA48AT3G

Littelfuse Inc.In Stock: 15119SZ1SMA48AT3G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMAJ48A-13 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): Must be 48V
• Voltage - Breakdown (Min): Must be 53.3V
• Voltage - Clamping (Max) @ Ipp: Must be 77.4V (or within acceptable tolerance for the application)
• Current - Peak Pulse (10/1000µs): Must be 5.2A (or within acceptable tolerance)
• Power - Peak Pulse: Must be 400W
• Package / Case: Must be DO-214AC (SMA) for direct PCB footprint compatibility
• Mounting Type: Must be Surface Mount
• Operating Temperature Range: Must support -55°C to 150°C minimum

Substitute parts are grouped into two categories:

Category 1: Direct Electrical & Package Equivalents (DO-214AC/SMA Package) Parts with identical voltage ratings, clamping voltage, peak pulse current, and the same SMA package. These provide drop-in replacement capability.

Category 2: Functional Equivalents with Package Variation (SOD-123W Package) Parts with identical electrical specifications but different surface mount package. These require PCB layout modification and are suitable only when package footprint change is acceptable.

Category 3: Partial Electrical Variation (Clamping Voltage Deviation) Parts with the same standoff and breakdown voltages but different clamping voltage or peak pulse current specifications. These are listed for reference but require application-level verification before substitution.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement — DO-214AC/SMA Package)

SMAJ48A-13-F (Diodes Incorporated) is the direct successor to the discontinued SMAJ48A-13. Both parts are manufactured by Diodes Incorporated with identical electrical specifications. The -13-F variant is currently active and ROHS3 compliant, making it the preferred choice for new designs and production restocking.

SMAJ48A-E3/61 (Vishay General Semiconductor - Diodes Division) provides equivalent electrical performance in the TransZorb® series. This part is ROHS3 compliant and widely available with high inventory levels, suitable for immediate deployment.

SMAJ48A-TP (Micro Commercial Co) and SMAJ48A (MDD) are functionally equivalent alternatives with identical voltage and current ratings. Both are ROHS3 compliant and available in active production status.

SMAJ48AHR3G (Taiwan Semiconductor Corporation) meets all electrical specifications and includes AEC-Q101 automotive qualification. This part is suitable for applications requiring automotive-grade components.

Secondary Substitutes (Electrical Equivalents with Package Variation)

PTVS48VS1UR,115 (Nexperia USA Inc.) provides identical electrical performance but uses the SOD-123W package instead of DO-214AC/SMA. This part is AEC-Q101 qualified and ROHS3 compliant. Substitution requires PCB layout modification to accommodate the different package footprint.

Partial Equivalents (Electrical Variation — Use with Application Verification)

SMAJ48A-TR (STMicroelectronics) has the same standoff and breakdown voltages but differs in clamping voltage (100V vs. 77.4V) and peak pulse current specification (23A at 8/20µs vs. 5.2A at 10/1000µs). This part is suitable only for applications where higher clamping voltage is acceptable or beneficial.

SMAJ48HR3G (Taiwan Semiconductor Corporation) has the same standoff and breakdown voltages but differs in clamping voltage (85.5V vs. 77.4V) and peak pulse current (4.7A vs. 5.2A). This part is AEC-Q101 qualified and suitable for applications tolerating slightly higher clamping voltage.

Frequently Asked Questions (FAQ)

Q: Can I use SMAJ48A-13-F as a direct replacement for SMAJ48A-13?

A: Yes. Both parts are manufactured by Diodes Incorporated with identical electrical specifications: 48V reverse standoff, 53.3V breakdown voltage, 77.4V clamping voltage, and 5.2A peak pulse current. The -13-F variant is the active production version and is ROHS3 compliant. The only difference is packaging format (Tape & Reel vs. bulk), which does not affect electrical performance.

Q: What is the difference between DO-214AC and SMA packages?

A: DO-214AC and SMA refer to the same physical package. DO-214AC is the formal IEC designation, while SMA is the industry common name. These terms are interchangeable for surface mount diodes in this form factor.

Q: Can I substitute PTVS48VS1UR,115 for SMAJ48A-13?

A: PTVS48VS1UR,115 has identical electrical specifications but uses the SOD-123W package instead of DO-214AC/SMA. Direct PCB footprint compatibility is not possible without layout modification. Electrical performance is equivalent, making this suitable only if PCB redesign is acceptable.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts bearing this qualification (such as ATV04A480J-HF, SMAJ48A-Q, SMAJ48AHR3G, and SMAJ48HR3G) meet automotive reliability and performance requirements. These parts are suitable for automotive and high-reliability applications.

Q: Why does SMAJ48A-TR have different electrical specifications?

A: SMAJ48A-TR specifies a 100V clamping voltage and 23A peak pulse current (8/20µs pulse width) compared to the standard 77.4V and 5.2A (10/1000µs). This represents a different variant within the SMAJ48 base product family, optimized for different transient suppression requirements. Substitution requires application-level verification that the higher clamping voltage is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original SMAJ48A-13 is RoHS non-compliant. If RoHS compliance is a requirement, any of the active substitute parts satisfy this criterion.

Q: What inventory considerations should I account for?

A: SMAJ48A (MDD) has the highest inventory level at 202,151 pieces. SMAJ48A-E3/61 (Vishay) has 214,100 pieces available. PTVS48VS1UR,115 (Nexperia) has 18,960 pieces. These high-inventory options provide supply chain stability for production quantities.