1.5SMC540AHM3_A/I Equivalent & Substitute Parts

Part Overview

The 1.5SMC540AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the 1.5SMC TransZorb® series. This surface mount component is designed for transient voltage protection in telecom applications, featuring a 459V reverse standoff voltage and 740V maximum clamping voltage. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

1.5SMC540AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 11531.5SMC540AHM3_A/I Datasheet

Current PartRFQ

1.5SMC540AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 9451.5SMC540AHM3_B/I Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 1.5SMC540AHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 459V
• Voltage - Breakdown (Min): 513V
• Voltage - Clamping (Max) @ Ipp: 740V
• Current - Peak Pulse (10/1000µs): 2.03A
• Power - Peak Pulse: 1500W
• Unidirectional Channels: 1
• Package / Case: DO-214AB, SMC
• Operating Temperature Range: -65°C ~ 150°C
• Automotive Grade and AEC-Q101 Qualification

The substitute part 1.5SMC540AHM3_B/I maintains identical electrical specifications and automotive qualification. The primary difference is packaging configuration (Tape & Reel versus bulk) and product status (Active versus Discontinued).

Parameter Comparison

Engineering Selection Recommendations

The 1.5SMC540AHM3_B/I is a direct functional equivalent to the 1.5SMC540AHM3_A/I. Both parts are manufactured by Vishay and maintain identical electrical performance specifications across all critical parameters: voltage ratings, current handling, power dissipation, and temperature operating range.

The substitute part carries the same automotive grade classification and AEC-Q101 qualification, ensuring compliance with automotive reliability standards. The primary distinction is product availability status: the original part is discontinued, while the substitute remains in active production with current inventory availability.

The packaging difference (Tape & Reel configuration for the substitute versus standard packaging for the original) does not affect electrical performance or PCB-level compatibility. Both parts use the DO-214AB (SMC) surface mount package with identical footprint and soldering requirements.

Frequently Asked Questions (FAQ)

Q: Are the electrical specifications identical between 1.5SMC540AHM3_A/I and 1.5SMC540AHM3_B/I?

A: Yes. Both parts share identical voltage ratings (459V reverse standoff, 513V breakdown minimum, 740V clamping maximum), current specifications (2.03A peak pulse), power rating (1500W), and operating temperature range (-65°C to 150°C). They are electrically equivalent.

Q: What is the difference between the two part numbers?

A: The primary difference is packaging format. The 1.5SMC540AHM3_B/I is supplied in Tape & Reel (TR) configuration, while the 1.5SMC540AHM3_A/I uses standard packaging. Additionally, the original part is discontinued, while the substitute is actively produced.

Q: Can I use 1.5SMC540AHM3_B/I as a direct replacement on my PCB?

A: Yes. Both parts use the identical DO-214AB (SMC) surface mount package with the same footprint, pin configuration, and soldering requirements. No PCB layout modifications are necessary.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the 1.5SMC540AHM3_A/I and 1.5SMC540AHM3_B/I carry automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: Are there any compliance or regulatory differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory and environmental compliance is equivalent.