SMA5J40HE3/61 Equivalent & Substitute Parts

Part Overview

The SMA5J40HE3/61 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates with a 40V reverse standoff voltage and provides 71.4V maximum clamping voltage at peak pulse current, housed in a DO-214AC (SMA) surface mount package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

SMA5J40HE3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 1113SMA5J40HE3/61 Datasheet

Current PartRFQ

SMAJ40E3/TR13

Microchip TechnologyIn Stock: 825SMAJ40E3/TR13 Datasheet

DirectRFQ

SM4T47AY

STMicroelectronicsIn Stock: 4476SM4T47AY Datasheet

MFR RecommendedRFQ

SMA6J40A-TR

STMicroelectronicsIn Stock: 5153SMA6J40A-TR Datasheet

MFR RecommendedRFQ

SMAJ40A

MDDIn Stock: 3492SMAJ40A Datasheet

MFR RecommendedRFQ

SMAJ40A

MDDIn Stock: 3492SMAJ40A Datasheet

MFR RecommendedRFQ

SMAJ40A-TP

Micro Commercial CoIn Stock: 10725SMAJ40A-TP Datasheet

MFR RecommendedRFQ

SMAJ40A-TR

STMicroelectronicsIn Stock: 40141SMAJ40A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMA5J40HE3/61 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 40V
• Voltage - Breakdown (Min): Must be 44.4V
• Package / Case: Must be DO-214AC (SMA) surface mount
• Unidirectional Channels: Must be 1
• Mounting Type: Must be Surface Mount
• RoHS Status: Must be ROHS3 Compliant

Substitute parts are grouped into two categories based on clamping voltage and peak pulse current characteristics:

Group A (Lower Current Rating): Parts with clamping voltage between 64.5V–71.4V and peak pulse current of 6.2A–7A. These provide direct functional equivalence with minimal performance variation.

Group B (Higher Current Rating): Parts with clamping voltage between 73.6V–84V and peak pulse current of 27A–48A. These offer enhanced transient suppression capability and are suitable for applications requiring higher energy dissipation.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Group A - Closest Electrical Match)

SMAJ40E3/TR13 (Microchip Technology) provides the most direct electrical equivalence to the SMA5J40HE3/61, matching the 71.4V clamping voltage and 7A peak pulse current specification. This part is active and ROHS3 compliant with extended lower operating temperature range (-65°C minimum). Selection of this part minimizes design validation requirements.

SMAJ40A (MDD) and SMAJ40A-TP (Micro Commercial Co) offer functional substitution with slightly lower clamping voltage (64.5V) and peak pulse current (6.2A). Both are active, ROHS3 compliant, and available in high inventory. SMAJ40A-TP extends the upper operating temperature to 175°C.

Enhanced Performance Alternative (Group B - Higher Transient Suppression)

SM4T47AY (STMicroelectronics) and SMAJ40A-TR (STMicroelectronics) provide higher peak pulse current ratings (27A) and clamping voltage (84V and 84V respectively), enabling superior transient energy dissipation. Both are active, AEC-Q101 qualified (SM4T47AY), and ROHS3 compliant. These parts are suitable for applications requiring enhanced overvoltage protection margins.

SMA6J40A-TR (STMicroelectronics) offers the highest peak pulse current (48A) and power dissipation (600W) with extended upper operating temperature (175°C). This part is active and ROHS3 compliant, suitable for demanding transient suppression applications.

All substitute parts maintain DO-214AC (SMA) surface mount packaging, ensuring mechanical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can SMAJ40A-TP directly replace SMA5J40HE3/61 without circuit modification?

A: Yes. SMAJ40A-TP maintains identical reverse standoff voltage (40V), breakdown voltage (44.4V), and DO-214AC (SMA) package. The clamping voltage is 64.5V versus 71.4V on the original part. Circuit validation is required to confirm this lower clamping voltage is acceptable for the application's transient suppression requirements.

Q: What is the difference between Group A and Group B substitute parts?

A: Group A parts (SMAJ40E3/TR13, SMAJ40A, SMAJ40A-TP) match or closely approximate the original 7A peak pulse current and 71.4V clamping voltage. Group B parts (SM4T47AY, SMAJ40A-TR, SMA6J40A-TR) provide significantly higher peak pulse current (27A–48A) and clamping voltage (73.6V–84V), offering enhanced transient suppression capability at the cost of higher power dissipation and potential circuit behavior changes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.

Q: Which substitute part has the widest operating temperature range?

A: SMAJ40A-TP and SMA6J40A-TR both extend the upper operating temperature to 175°C, compared to 150°C on the original SMA5J40HE3/61. SMAJ40E3/TR13 extends the lower operating temperature to -65°C.

Q: Can I use SM4T47AY or SMAJ40A-TR as direct replacements?

A: These parts share identical reverse standoff and breakdown voltages with DO-214AC (SMA) packaging. However, the higher clamping voltage (84V) and peak pulse current (27A) represent different electrical characteristics. Circuit simulation and validation are required to confirm compatibility with the original design's transient suppression strategy.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in DO-214AC (SMA) surface mount package. Packaging variants include Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and bulk options. Verify packaging format with supplier based on production requirements.