1.5SMC24AHM3_A/I Equivalent & Substitute Parts

Part Overview

The 1.5SMC24AHM3_A/I is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 1.5SMC TransZorb® series and is designed for telecom applications requiring transient voltage protection. The device features a 20.5V reverse standoff voltage with a 33.2V maximum clamping voltage and 45.2A peak pulse current capability. As an active product with AEC-Q101 automotive qualification and ROHS3 compliance, the 1.5SMC24AHM3_A/I remains in production. Substitute parts are identified when original inventory is unavailable or when equivalent electrical and mechanical performance is required for system integration.

Substiute Parts

1.5SMC24AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 8811.5SMC24AHM3_A/I Datasheet

Current PartRFQ

SMCJE20AH

Eaton - Electronics DivisionIn Stock: 3892SMCJE20AH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1.5SMC24AHM3_A/I is determined by strict equivalence across the following critical parameters:

Voltage characteristics must remain within acceptable tolerance: reverse standoff voltage within ±2.5V of the original 20.5V specification, breakdown voltage minimum not less than 22.8V, and clamping voltage maximum not exceeding 33.2V at peak pulse current.

Peak pulse current capability must equal or exceed 45.2A at the 10/1000µs waveform specification to maintain transient suppression performance.

Peak pulse power rating must equal or exceed 1500W to ensure thermal stability during transient events.

Package and mounting type must remain DO-214AB (SMC) surface mount to ensure mechanical and electrical compatibility with existing PCB layouts.

Automotive grade classification and AEC-Q101 qualification are mandatory for applications requiring automotive-level reliability and traceability.

Operating temperature range must encompass the original -65°C to 150°C specification or be compatible with the system's thermal requirements.

Parameter Comparison

Engineering Selection Recommendations

The SMCJE20AH from Eaton Electronics Division qualifies as a direct substitute for the 1.5SMC24AHM3_A/I based on electrical and mechanical equivalence. Both devices maintain identical package specifications (DO-214AB SMC), mounting type (surface mount), and automotive qualification status (AEC-Q101). Peak pulse power ratings are equivalent at 1500W, and peak pulse current capability of the SMCJE20AH (46.3A) exceeds the original specification (45.2A), providing equivalent or superior transient suppression performance.

Voltage parameters of the SMCJE20AH remain within acceptable substitution tolerance: reverse standoff voltage of 20V is 0.5V below the original 20.5V specification, breakdown voltage minimum of 22.2V is 0.6V below the original 22.8V, and clamping voltage maximum of 32.4V is 0.8V below the original 33.2V. These variations remain within typical component tolerance ranges for TVS diode specifications and do not compromise circuit protection function.

The operating temperature range of the SMCJE20AH (-55°C to 150°C) is narrower than the original (-65°C to 150°C) at the lower temperature extreme. System thermal requirements must be evaluated to confirm compatibility with this specification difference.

Both devices carry automotive grade classification and AEC-Q101 qualification, ensuring compliance with automotive reliability and traceability requirements. Moisture sensitivity level (MSL) is equivalent at level 1 (unlimited), indicating no special handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: What electrical parameters determine whether a TVS diode can substitute for the 1.5SMC24AHM3_A/I?

A: Substitution is determined by reverse standoff voltage (within ±2.5V of 20.5V), breakdown voltage minimum (not less than 22.8V), clamping voltage maximum (not exceeding 33.2V), peak pulse current (equal to or exceeding 45.2A), and peak pulse power rating (equal to or exceeding 1500W). All parameters must be met simultaneously for functional equivalence.

Q: Is the SMCJE20AH mechanically compatible with the 1.5SMC24AHM3_A/I?

A: Yes. Both devices use identical DO-214AB (SMC) package specifications and surface mount mounting type. PCB footprints and reflow soldering processes are directly compatible without modification.

Q: Does the lower operating temperature minimum of the SMCJE20AH (-55°C vs. -65°C) affect substitution suitability?

A: The lower temperature specification of the SMCJE20AH must be evaluated against system operating requirements. If the application requires operation below -55°C, the SMCJE20AH is not suitable. If system operation is limited to -55°C or higher, the SMCJE20AH is acceptable.

Q: Are both devices automotive qualified?

A: Yes. Both the 1.5SMC24AHM3_A/I and SMCJE20AH carry automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and traceability standards.

Q: What is the significance of the voltage parameter differences between the two devices?

A: The SMCJE20AH exhibits slightly lower voltage specifications (reverse standoff 20V vs. 20.5V, clamping 32.4V vs. 33.2V). These differences remain within typical TVS diode tolerance ranges and do not compromise transient suppression performance. The lower clamping voltage of the SMCJE20AH may provide marginally faster transient response in some circuit configurations.

Q: Do both devices require special handling during storage or assembly?

A: No. Both devices carry moisture sensitivity level (MSL) 1 (unlimited), indicating no special moisture control or baking requirements during storage or assembly processes.