SMBJ48AE3/TR13

Part Overview

The SMBJ48AE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This surface-mount component is rated for 48V reverse standoff voltage with a 77.4V maximum clamping voltage and 7.7A peak pulse current capability. The device is actively produced and maintains full RoHS3 compliance with unlimited moisture sensitivity rating. Equivalent and substitute parts are necessary when the original manufacturer's inventory is unavailable, when alternative packaging formats are required, or when supply chain optimization demands sourcing from multiple qualified suppliers.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMBJ48AE3/TR13
Manufacturer	Microchip Technology
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	48V
Voltage - Breakdown (Min)	53.3V
Voltage - Clamping (Max) @ Ipp	77.4V
Current - Peak Pulse (10/1000µs)	7.7A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution for the SMBJ48AE3/TR13 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 48V ±tolerance
Voltage - Clamping (Max) @ Ipp: 77.4V nominal (acceptable range: 76.3V–77.4V based on manufacturing variation)
Current - Peak Pulse (10/1000µs): 7.7A minimum (acceptable range: 7.7A–8.1A)
Power - Peak Pulse: 600W
Package / Case: DO-214AA / SMB form factor
Mounting Type: Surface Mount
Type: Zener, Unidirectional
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Parts are classified as Direct Substitutes when all critical electrical parameters match within manufacturing tolerances and packaging is identical. Parts designated as Similar meet the core voltage and current specifications but may vary in packaging format, manufacturer, or minor operational characteristics (such as peak pulse current within the acceptable range).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Inventory Status
SMBJ48AE3/TR13	Microchip Technology	48V	77.4V	7.7A	600W	DO-214AA, SMB	-65°C ~ 150°C	896 Pcs
SMBJ48A-13-F	Diodes Incorporated	48V	77.4V	7.7A	600W	DO-214AA, SMB	-55°C ~ 150°C	6400 Pcs
SMBJ48A-TP	Micro Commercial Co	48V	77.4V	7.7A	600W	DO-214AA, SMB	-55°C ~ 175°C	3795 Pcs
SMBJ48A	Meritek	48V	77.4V	7.75A	600W	DO-214AA, SMB	-55°C ~ 150°C	77400 Pcs
SMBJ48A-E3/52	Vishay General Semiconductor	48V	77.4V	7.8A	600W	DO-214AA, SMB	-55°C ~ 150°C	20100 Pcs
SMBJ48A-E3/5B	Vishay General Semiconductor	48V	77.4V	7.8A	600W	DO-214AA, SMB	-55°C ~ 150°C	3846 Pcs
SMBJ48A-TR	STMicroelectronics	48V	77.4V	8.1A	600W	DO-214AA, SMB	-55°C ~ 150°C	1756 Pcs
SMBJ48D-M3/I	Vishay General Semiconductor	48V	76.3V	7.9A	600W	DO-214AA, SMB	-55°C ~ 150°C	15851 Pcs
SZ1SMB48AT3G	Littelfuse Inc.	48V	77.4V	7.7A	600W	DO-214AA, SMB	-65°C ~ 150°C	2163 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) ratings consistent with the SMBJ48AE3/TR13. Selection among qualified substitutes is determined by inventory availability, supply chain partnerships, and specific operating temperature requirements.

SMBJ48A-13-F (Diodes Incorporated) and SMBJ48A-TP (Micro Commercial Co) are direct electrical equivalents with identical voltage and current specifications. SMBJ48A-TP extends the upper operating temperature to 175°C, providing additional thermal margin in high-temperature applications.

SMBJ48A (Meritek) offers the highest inventory quantity (77400 Pcs), with peak pulse current of 7.75A within the acceptable substitution range.

SMBJ48A-E3/52 and SMBJ48A-E3/5B (Vishay General Semiconductor, TransZorb® series) provide equivalent performance with peak pulse current of 7.8A and substantial inventory (20100 Pcs and 3846 Pcs respectively).

SMBJ48A-TR (STMicroelectronics, TRANSIL™ series) supports peak pulse current of 8.1A, the highest among listed alternatives, suitable for applications requiring enhanced transient suppression capability.

SMBJ48D-M3/I (Vishay General Semiconductor) exhibits a slightly lower maximum clamping voltage of 76.3V and represents a near-equivalent option for applications with relaxed clamping voltage tolerance.

SZ1SMB48AT3G (Littelfuse Inc.) matches the original part's -65°C to 150°C operating range and includes AEC-Q101 automotive qualification. This part is appropriate for automotive and mission-critical applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can I substitute SMBJ48AE3/TR13 with any of the listed parts without circuit redesign?

A: Yes, provided the substitute meets the core electrical specifications: 48V reverse standoff voltage, 77.4V ±1V maximum clamping voltage, and minimum 7.7A peak pulse current. All listed parts satisfy these criteria within manufacturing tolerances.

Q: What is the significance of the operating temperature range differences?

A: The SMBJ48AE3/TR13 operates from -65°C to 150°C, while most substitutes operate from -55°C to 150°C. The narrower range is acceptable for applications with ambient temperature boundaries above -55°C. SMBJ48A-TP extends to 175°C, providing additional margin for high-temperature environments.

Q: How do I select between Vishay, Littelfuse, Diodes Incorporated, and Microchip parts?

A: Selection is based on supply availability, cost structure, and application requirements. Vishay parts (SMBJ48A-E3/52, SMBJ48A-E3/5B, SMBJ48D-M3/I) are widely available and feature the TransZorb® series designation. Littelfuse SZ1SMB48AT3G includes AEC-Q101 qualification for automotive applications. Diodes Incorporated SMBJ48A-13-F and Micro Commercial SMBJ48A-TP offer direct equivalence with larger inventory pools.

Q: What is the acceptable tolerance range for peak pulse current?

A: The SMBJ48AE3/TR13 is rated at 7.7A. Substitutes with peak pulse current from 7.7A to 8.1A are acceptable, as they provide equal or enhanced transient suppression. Meritek SMBJ48A at 7.75A and Vishay parts at 7.8A–7.9A fall within this range.

Q: Is SMBJ48D-M3/I a suitable substitute despite the lower clamping voltage?

A: SMBJ48D-M3/I exhibits a maximum clamping voltage of 76.3V compared to the original 77.4V, representing a 1.1V difference. This part is suitable only if the application circuit design accommodates the lower clamping value. Verification against circuit overstress limits is required.

Q: Which part has the longest shelf life and fastest delivery?

A: SMBJ48A (Meritek) maintains the highest inventory at 77400 Pcs. SMBJ48A-E3/52 (Vishay) carries 20100 Pcs. Both support immediate availability. All listed parts carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no time-dependent moisture absorption restrictions.

Q: What is the difference between tape & reel and cut tape & digi-reel packaging?

A: Tape & Reel (TR) packaging provides continuous component strips suitable for high-volume automated assembly lines. Cut Tape & Digi-Reel provide cut sections and individual component options for smaller production runs or manual assembly. Both formats contain the same die and perform identically in circuit operation. Selection depends on production volume and assembly line compatibility.

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