SZ1SMB48AT3G Equivalent & Substitute Parts

Part Overview

The SZ1SMB48AT3G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AA (SMB) package. This component operates with a 48V reverse standoff voltage and provides 77.4V clamping at peak pulse current, delivering 600W peak pulse power dissipation. The device is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Equivalent and substitute parts are identified based on matching electrical parameters (voltage ratings, clamping characteristics, peak pulse current) and mechanical compatibility (package type, mounting configuration).

Substiute Parts

SZ1SMB48AT3G

Littelfuse Inc.In Stock: 2236SZ1SMB48AT3G Datasheet

Current PartRFQ

SMBJ48A

MeritekIn Stock: 77463SMBJ48A Datasheet

MFR RecommendedRFQ

SMBJ48A-TP

Micro Commercial CoIn Stock: 3872SMBJ48A-TP Datasheet

UpgradeRFQ

SMBJ48A

MeritekIn Stock: 77463SMBJ48A Datasheet

MFR RecommendedRFQ

SMBJ48A

MeritekIn Stock: 77463SMBJ48A Datasheet

MFR RecommendedRFQ

SMBJ48A-13-F

Diodes IncorporatedIn Stock: 6470SMBJ48A-13-F Datasheet

MFR RecommendedRFQ

SMBJ48A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 3880SMBJ48A-E3/5B Datasheet

MFR RecommendedRFQ

SMBJ48A-TR

STMicroelectronicsIn Stock: 1819SMBJ48A-TR Datasheet

MFR RecommendedRFQ

SMBJE48AH

Eaton - Electronics DivisionIn Stock: 3746SMBJE48AH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SZ1SMB48AT3G are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 48V
• Voltage - Breakdown (Min): 53.3V
• Voltage - Clamping (Max) @ Ipp: 77.4V
• Current - Peak Pulse (10/1000µs): 7.7A ±0.4A tolerance
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Type: Zener, Unidirectional

All identified substitute parts maintain these core electrical specifications within acceptable engineering tolerances. Variations in peak pulse current (7.7A to 8.1A) remain within the functional operating range for this voltage class. Operating temperature ranges may vary between -55°C and -65°C minimum, with maximum ratings between 150°C and 175°C.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring continued availability and regulatory alignment. Selection among these equivalents depends on specific application requirements:

Automotive Applications: The SZ1SMB48AT3G (Littelfuse) and SMBJE48AH (Eaton) both carry AEC-Q101 automotive qualification. The SMBJE48AH provides equivalent automotive-grade protection with identical electrical specifications.

Extended Temperature Range: The SMBJ48A-TP (Micro Commercial Co) supports operation to 175°C maximum junction temperature, compared to 150°C for most alternatives, providing additional thermal margin in high-temperature environments.

Peak Pulse Current Tolerance: All substitutes operate within 7.7A to 8.1A peak pulse current range. The SMBJ48A-TR (STMicroelectronics) delivers the highest peak pulse current at 8.1A, while SMBJ48A (Meritek) and SMBJ48A-TP maintain 7.7A to 7.75A specifications matching the original device.

Packaging Variants: SMBJ48A (Meritek) is available in standard packaging without specified tape & reel designation. SMBJ48A-TP, SMBJ48A-13-F, SMBJ48A-E3/5B, and SMBJ48A-TR are all available in Tape & Reel (TR) or Cut Tape (CT) configurations suitable for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts directly for the SZ1SMB48AT3G?

A: Yes. All listed parts maintain identical voltage ratings (48V standoff, 53.3V breakdown, 77.4V clamping) and package configuration (DO-214AA SMB). Peak pulse current variations (7.7A to 8.1A) remain within acceptable tolerance for this voltage class. Verify operating temperature requirements for your specific application, as some alternatives have minimum ratings of -55°C versus -65°C for the original.

Q: What is the difference between the various SMBJ48A variants?

A: The SMBJ48A base part is available from multiple manufacturers (Meritek, Diodes Inc., Vishay, STMicroelectronics, Eaton). Suffixes indicate packaging and qualification differences: -TP denotes Tape & Reel from Micro Commercial Co with extended 175°C maximum temperature; -13-F indicates Diodes Inc. tape & reel packaging; -E3/5B specifies Vishay's TransZorb® series in tape & reel; -TR identifies STMicroelectronics TRANSIL™ series; -AH designates Eaton's automotive-qualified variant.

Q: Are there compliance or certification differences?

A: The SZ1SMB48AT3G and SMBJE48AH both carry AEC-Q101 automotive qualification. All parts are ROHS3 compliant and REACH unaffected. If automotive qualification is required, these two options are specified. For general-purpose applications, all alternatives meet compliance requirements.

Q: Does packaging affect substitution?

A: All parts use the DO-214AA (SMB) surface mount package with identical footprint and pinout. Packaging format differences (Tape & Reel, Cut Tape, or bulk) affect handling and assembly processes but not electrical or mechanical compatibility. Select packaging format based on your manufacturing process requirements.

Q: What if my application requires the -65°C minimum operating temperature?

A: The SZ1SMB48AT3G specifies -65°C minimum junction temperature. Most substitutes are rated to -55°C minimum. If your application requires -65°C operation, the original SZ1SMB48AT3G or SMBJE48AH (which shares automotive qualification) are the specified options. Verify thermal design margins if operating near -55°C minimum with alternative parts.