Equivalent & Substitute Parts for 3KASMC24AHM3_A/I

Part Overview

The 3KASMC24AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AB (SMC) package. This component provides transient overvoltage protection with a 24V reverse standoff voltage and 38.9V maximum clamping voltage at peak pulse current of 77.1A. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new design implementations.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	24V
Breakdown Voltage (Min)	26.7V
Clamping Voltage (Max) @ Ipp	38.9V
Peak Pulse Current (10/1000µs)	77.1A
Peak Pulse Power	3000W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 185°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC24AHM3_A/I is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Reverse Standoff Voltage: 24V (Typ)
Breakdown Voltage: 26.7V (Min)
Clamping Voltage: 38.9V (Max) @ Ipp
Peak Pulse Current: 77.1A ± tolerance (10/1000µs)
Peak Pulse Power: 3000W
Package: DO-214AB, SMC (surface mount)
Unidirectional configuration (1 channel)
Zener type TVS diode

Secondary Compatibility Factors:

RoHS3 compliance
Moisture Sensitivity Level 1
Surface mount assembly compatibility

Parts meeting all primary criteria are classified as direct electrical equivalents. Variations in operating temperature range, product status (active vs. obsolete), or manufacturer do not disqualify substitution when electrical and mechanical parameters are identical. The 3.0SMC24A and 1SMC24A TR13 PBFREE exhibit deviations in clamping voltage and peak pulse current specifications and are therefore listed as reference alternatives only, not direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamp Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Temp Range (°C)	Product Status
3KASMC24AHM3_A/I	Vishay	24	26.7	38.9	77.1	3000	DO-214AB, SMC	-65 ~ 185	Obsolete
3KASMC24AHM3_B/I	Vishay	24	26.7	38.9	77.1	3000	DO-214AB, SMC	-65 ~ 185	Active
3.0SMCJ24A-13	Diodes Incorporated	24	26.7	38.9	77.1	3000	DO-214AB, SMC	-55 ~ 175	Active
SM30T28AY	STMicroelectronics	24	26.7	38.9	77.1	3000	DO-214AB, SMC	-55 ~ 175	Active
SMDJ24A	Alpha & Omega Semiconductor Inc.	24	26.7	38.9	77.2	3000	DO-214AB, SMC	-55 ~ 150	Active
SMDJ24A-HR	Littelfuse Inc.	24	26.7	38.9	77.1	3000	DO-214AB, SMC	-65 ~ 150	Active
SMDJ24A-HRA	Littelfuse Inc.	24	26.7	38.9	77.1	3000	DO-214AB, SMC	-65 ~ 150	Active
SMDJ24A-HRAT7	Littelfuse Inc.	24	26.7	38.9	77.1	3000	DO-214AB, SMC	-65 ~ 150	Active
TPSMD24A	Littelfuse Inc.	24	26.7	38.9	77.1	3000	DO-214AB, SMC	-65 ~ 150	Active
1SMC24A TR13 PBFREE	Central Semiconductor Corp	24	26.7	38.9	38.6	1500	DO-214AB, SMC	-65 ~ 150	Active
3.0SMC24A	Littelfuse Inc.	24	26.7	51	520 (8/20µs)	—	DO-214AB, SMC	-65 ~ 150	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (Recommended for Replacement):

The following parts satisfy all primary substitution criteria and are suitable for direct replacement of the 3KASMC24AHM3_A/I:

3KASMC24AHM3_B/I (Vishay): Active product status with identical electrical specifications and extended temperature range (-65°C to 185°C). Preferred for applications requiring the full temperature capability of the original design.
3.0SMCJ24A-13 (Diodes Incorporated): Active status with matching electrical parameters. Temperature range -55°C to 175°C is suitable for most industrial and commercial applications.
SM30T28AY (STMicroelectronics): Active TRANSIL™ series part with identical electrical specifications. AEC-Q101 automotive qualification and -55°C to 175°C operating range support automotive and industrial applications.
SMDJ24A (Alpha & Omega Semiconductor Inc.): Active product with 77.2A peak pulse current (within tolerance of 77.1A specification). Operating range -55°C to 150°C.
SMDJ24A-HR, SMDJ24A-HRA, SMDJ24A-HRAT7 (Littelfuse Inc.): Active high-reliability variants with identical electrical specifications. Extended lower temperature limit (-65°C) supports military and aerospace applications. Operating range -65°C to 150°C.
TPSMD24A (Littelfuse Inc.): Active product with identical electrical specifications and AEC-Q101 automotive qualification. Operating range -65°C to 150°C. Highest inventory availability (20,100 pcs).

Reference Alternatives (Limited Substitution):

1SMC24A TR13 PBFREE (Central Semiconductor Corp): Meets voltage specifications but provides reduced peak pulse current (38.6A vs. 77.1A) and peak pulse power (1500W vs. 3000W). Suitable only for applications with lower transient current requirements.
3.0SMC24A (Littelfuse Inc.): Meets voltage specifications but provides significantly higher peak pulse current (520A at 8/20µs) and clamping voltage (51V). Not recommended as direct replacement due to different transient response characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use 1SMC24A TR13 PBFREE as a direct replacement for 3KASMC24AHM3_A/I?

A: No. While the 1SMC24A TR13 PBFREE maintains the same 24V reverse standoff voltage and 38.9V clamping voltage, it provides only 38.6A peak pulse current and 1500W peak pulse power compared to the required 77.1A and 3000W. Use only in applications with confirmed lower transient current requirements.

Q: What is the difference between SMDJ24A-HR, SMDJ24A-HRA, and SMDJ24A-HRAT7?

A: All three are Littelfuse high-reliability variants with identical electrical specifications (24V standoff, 38.9V clamp, 77.1A peak current, 3000W power). The suffix designations indicate different packaging or tape configurations. Electrical performance is equivalent for circuit design purposes.

Q: Does operating temperature range affect substitution eligibility?

A: Operating temperature range does not disqualify substitution when all electrical and mechanical parameters match. However, applications requiring the full -65°C to 185°C range of the original 3KASMC24AHM3_A/I should specify 3KASMC24AHM3_B/I. Most alternatives operate to -55°C or -65°C minimum, which is adequate for standard industrial and automotive applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited shelf life), matching the original part specifications.

Q: Why is 3.0SMC24A listed as a reference alternative rather than a direct substitute?

A: The 3.0SMC24A exhibits different transient response characteristics with 51V clamping voltage (vs. 38.9V) and 520A peak pulse current at 8/20µs waveform (vs. 77.1A at 10/1000µs). These differences alter the protection profile and are not interchangeable without circuit re-evaluation.

Q: Which substitute part has the highest inventory availability?

A: TPSMD24A (Littelfuse Inc.) with 20,100 pcs in stock. This part also carries AEC-Q101 automotive qualification and identical electrical specifications to the original part.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet the identical electrical specifications (24V standoff, 26.7V breakdown, 38.9V clamp, 77.1A peak current, 3000W power). All recommended direct equivalents are electrically interchangeable at the circuit level. Verify PCB footprint compatibility with the DO-214AB, SMC package specification.

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