SMA6L70A Equivalent & Substitute Parts

Part Overview

The SMA6L70A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 70V reverse standoff voltage with a 113V maximum clamping voltage and 5.3A 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 based on matching electrical performance parameters and package compatibility to support procurement flexibility and supply chain continuity.

Substiute Parts

SMA6L70A

Littelfuse Inc.In Stock: 1119SMA6L70A Datasheet

Current PartRFQ

TPSMA6L70A

Littelfuse Inc.In Stock: 46173TPSMA6L70A Datasheet

DirectRFQ

SM4T82AY

STMicroelectronicsIn Stock: 4656SM4T82AY Datasheet

MFR RecommendedRFQ

SMAJ70A-TR

STMicroelectronicsIn Stock: 2492SMAJ70A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMA6L70A are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 70V
• Voltage - Breakdown (Min): 77.8V
• Unidirectional Channels: 1
• Type: Zener
• Package compatibility: Surface mount with SMA or equivalent footprint
• RoHS3 compliance and unlimited MSL rating

Substitution Groups:

Group 1 - Direct Electrical Match (Same Series): TPSMA6L70A from Littelfuse Inc. matches all electrical parameters identically with the same 70V standoff voltage, 113V clamping voltage, and 5.3A peak pulse current. This part qualifies as a direct substitute with automotive-grade qualification (AEC-Q101) and operates across -50°C ~ 150°C.

Group 2 - Equivalent Performance (Higher Current Rating): SM4T82AY (STMicroelectronics) and SMAJ70A-TR (STMicroelectronics) both maintain the 70V reverse standoff and 77.8V breakdown voltage specifications. These parts feature higher peak pulse current ratings (16A at 8/20µs) and higher clamping voltages (146V), providing enhanced transient suppression capability. Both are packaged in DO-214AC SMA format with automotive qualification (AEC-Q101).

Parameter Comparison

Engineering Selection Recommendations

TPSMA6L70A (Littelfuse Inc.): This part provides the closest electrical equivalence to the SMA6L70A with identical voltage and current specifications. It is suitable for direct replacement in applications where the operating temperature range of -50°C ~ 150°C is acceptable. The automotive-grade qualification (AEC-Q101) supports use in automotive and industrial environments. This substitute is recommended when maintaining the exact electrical performance profile is required.

SM4T82AY (STMicroelectronics): This part is qualified for applications requiring higher transient current handling (16A vs. 5.3A) and lower clamping voltage margin (146V vs. 113V). The automotive qualification (AEC-Q101) and active product status support long-term availability. Selection of this part is appropriate when the application can tolerate the higher clamping voltage and benefits from increased current capacity. Package transition from DO-221AC to DO-214AC requires PCB layout verification.

SMAJ70A-TR (STMicroelectronics): This part offers equivalent voltage specifications with enhanced current handling capability (16A vs. 5.3A). It carries automotive qualification (AEC-Q101) and active product status. The DO-214AC SMA package provides compatibility with standard SMA footprints. This substitute is suitable for applications where higher transient current suppression is beneficial and the clamping voltage increase is acceptable.

Frequently Asked Questions (FAQ)

Q: Can TPSMA6L70A be used as a direct replacement for SMA6L70A?

A: Yes. TPSMA6L70A maintains identical electrical specifications: 70V reverse standoff voltage, 77.8V breakdown voltage, 113V clamping voltage, and 5.3A peak pulse current. Both parts use the DO-221AC package. The operating temperature range differs (-50°C ~ 150°C vs. -65°C ~ 150°C), which must be verified against application requirements.

Q: What are the differences between SM4T82AY and SMAJ70A-TR?

A: Both parts share identical electrical specifications (70V standoff, 77.8V breakdown, 146V clamping, 16A peak pulse current) and automotive qualification. The primary difference is manufacturer designation: SM4T82AY is part of the SM4TY TRANSIL™ series, while SMAJ70A-TR belongs to the SMAJ TRANSIL™ series. Both use DO-214AC SMA packaging.

Q: Why do SM4T82AY and SMAJ70A-TR have higher clamping voltages than SMA6L70A?

A: The higher clamping voltage (146V vs. 113V) reflects different transient suppression characteristics. These parts are designed for applications where higher voltage clamping is acceptable and the increased peak pulse current capability (16A vs. 5.3A) provides enhanced protection. Application circuit analysis is required to confirm compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SMA6L70A, TPSMA6L70A, SM4T82AY, and SMAJ70A-TR are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: What package considerations apply when substituting with STMicroelectronics parts?

A: SM4T82AY and SMAJ70A-TR use DO-214AC SMA packaging, while SMA6L70A and TPSMA6L70A use DO-221AC SMA packaging. Both package types are surface-mount SMA format with compatible footprints for standard SMA land patterns. PCB layout verification is recommended to confirm pad compatibility.

Q: Do all substitute parts have automotive qualification?

A: TPSMA6L70A, SM4T82AY, and SMAJ70A-TR carry AEC-Q101 automotive qualification. SMA6L70A does not list automotive qualification but is designated for general-purpose applications. Automotive applications should specify parts with AEC-Q101 qualification.