SMA6L48A Equivalent & Substitute Parts

Part Overview

The SMA6L48A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 48V reverse standoff voltage with a 77.4V maximum clamping voltage and 7.8A peak pulse current capability in a surface-mount DO-221AC package. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives that maintain electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

SMA6L48A

Littelfuse Inc.In Stock: 912SMA6L48A Datasheet

Current PartRFQ

TPSMA6L48A

Littelfuse Inc.In Stock: 24035TPSMA6L48A Datasheet

DirectRFQ

SMA6J48A-TR

STMicroelectronicsIn Stock: 30409SMA6J48A-TR Datasheet

MFR RecommendedRFQ

SMAJ48A-TR

STMicroelectronicsIn Stock: 2557SMAJ48A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMA6L48A is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 48V
• Voltage - Breakdown (Min): 53.3V minimum
• Unidirectional channel configuration (1 channel)
• Surface-mount technology
• RoHS3 compliance

Substitute parts must maintain the 48V reverse standoff voltage specification and support the same protection threshold. Variations in clamping voltage, peak pulse current, and package form factor are permitted when the core voltage protection function remains equivalent and mechanical compatibility is preserved.

Parameter Comparison

Engineering Selection Recommendations

TPSMA6L48A (Littelfuse Inc.) is a direct equivalent substitute with identical electrical specifications and package form factor. This part carries automotive-grade qualification (AEC-Q101) and operates across a narrower temperature range (-50 to 150°C). Selection of this substitute is appropriate when automotive-grade components are required or when supply availability of the SMA6L48A is constrained.

SMA6J48A-TR (STMicroelectronics) maintains the 48V reverse standoff voltage and 53.3V breakdown voltage threshold. This part features higher peak pulse current capability (40A vs. 7.8A) and extended operating temperature range (-55 to 175°C). The package transitions from DO-221AC to DO-214AC (SMA), requiring PCB layout verification for mechanical compatibility. This substitute provides enhanced transient suppression capacity and thermal performance.

SMAJ48A-TR (STMicroelectronics) also maintains the 48V reverse standoff voltage and 53.3V breakdown voltage. This part offers intermediate peak pulse current (23A) with reduced peak pulse power (400W vs. 600W). The DO-214AC package requires layout verification. This substitute is suitable when moderate transient suppression enhancement is acceptable and space constraints permit the SMA package form factor.

All substitute parts maintain RoHS3 compliance, unlimited moisture sensitivity rating, and active product status. Selection should be based on thermal requirements, transient current capacity needs, and mechanical package compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can TPSMA6L48A replace SMA6L48A in all applications?

A: Yes. TPSMA6L48A is electrically and mechanically equivalent with identical voltage specifications, clamping characteristics, and DO-221AC package form factor. The automotive-grade qualification and narrower operating temperature range (-50 to 150°C vs. -65 to 150°C) do not restrict substitution in standard applications.

Q: What are the package differences between DO-221AC and DO-214AC?

A: DO-221AC (SMA Flat Leads) and DO-214AC (SMA) are both surface-mount packages with different lead geometries and footprints. PCB layout and reflow profile verification is required when transitioning between these packages. Mechanical compatibility must be confirmed with the target PCB design.

Q: Can SMA6J48A-TR or SMAJ48A-TR be used as drop-in replacements?

A: These parts maintain the 48V reverse standoff voltage and 53.3V breakdown voltage, making them electrically compatible for overvoltage protection function. However, the package transition from DO-221AC to DO-214AC requires PCB footprint verification. These substitutes offer enhanced transient current handling (40A and 23A respectively) compared to the original 7.8A specification.

Q: What is the significance of the different peak pulse current ratings?

A: Peak pulse current rating indicates the maximum transient current the TVS diode can suppress. SMA6L48A and TPSMA6L48A are rated for 7.8A (10/1000µs), while SMA6J48A-TR handles 40A (8/20µs) and SMAJ48A-TR handles 23A (8/20µs). Higher ratings provide greater transient suppression capacity but may not be necessary for all circuit protection requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SMA6L48A, TPSMA6L48A, SMA6J48A-TR, and SMAJ48A-TR all carry RoHS3 compliance certification and unlimited moisture sensitivity rating (MSL 1).

Q: What temperature range considerations apply to substitute selection?

A: SMA6L48A operates from -65 to 150°C, TPSMA6L48A from -50 to 150°C, SMA6J48A-TR from -55 to 175°C, and SMAJ48A-TR from -55 to 150°C. Applications requiring operation below -50°C must use the original SMA6L48A. Applications requiring operation above 150°C must use SMA6J48A-TR.