Equivalent & Substitute Parts for 3KASMC20AHM3_A/I

Part Overview

The 3KASMC20AHM3_A/I is a unidirectional Zener 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 is classified as obsolete, necessitating identification of active substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	20	V
Voltage - Breakdown (Min)	22.2	V
Voltage - Clamping (Max) @ Ipp	35.8	V
Current - Peak Pulse (10/1000µs)	83.8	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65°C to 185°C	TJ
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the 3KASMC20AHM3_A/I is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 20V
Voltage - Breakdown (Min): 22.2V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Zener configuration
RoHS3 Compliance and MSL Level 1

Substitute parts are grouped into two categories based on electrical performance:

Category A (Matched Clamping Voltage): Parts with 35.8V clamping voltage matching the original specification. These provide direct functional equivalence.

Category B (Reduced Clamping Voltage): Parts with 32.4V clamping voltage. These maintain the same reverse standoff and breakdown voltages but operate at a lower clamping point, suitable for applications with relaxed clamping requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Status
3KASMC20AHM3_A/I	Vishay	20	22.2	35.8	83.8	3000	-65 to 185	DO-214AB, SMC	Obsolete
3KASMC20AHM3_B/I	Vishay	20	22.2	32.4	92.6	3000	-65 to 185	DO-214AB, SMC	Active
SMLJ20E3/TR13	Microchip Technology	20	22.2	35.8	83.8	300	-55 to 150	DO-214AB, SMC	Active
3.0SMCJ20A-13	Diodes Incorporated	20	22.2	32.4	62.6	3000	-55 to 175	DO-214AB, SMC	Active
5.0SMDJ20A	Taiwan Semiconductor Corporation	20	22.2	32.4	155	5000	-55 to 175	DO-214AB, SMC	Active
5.0SMDJ20A-T7	Littelfuse Inc.	20	22.2	32.4	155	5000	-65 to 150	DO-214AB, SMC	Active
SMCJ20A	Fairchild Semiconductor	20	22.2	32.4	46.3	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ20A-13-F	Diodes Incorporated	20	22.2	32.4	46.3	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ20A-TP	Micro Commercial Co	20	22.2	32.4	46.3	1500	-55 to 175	DO-214AB, SMC	Active

Engineering Selection Recommendations

For Direct Electrical Equivalence (35.8V Clamping):

SMLJ20E3/TR13 from Microchip Technology maintains identical clamping voltage and peak pulse current specifications. However, this part operates at reduced power dissipation (300W vs. 3000W) and narrower temperature range (-55°C to 150°C vs. -65°C to 185°C). Selection requires confirmation that application power levels do not exceed 300W and operating environment remains within -55°C to 150°C.

For Automotive-Grade Continuity:

3KASMC20AHM3_B/I from Vishay maintains automotive grade qualification (AEC-Q101) and the full -65°C to 185°C operating range. Clamping voltage is reduced to 32.4V with increased peak pulse current (92.6A). This part is the direct successor within the same manufacturer's product line.

For General-Purpose Applications with Enhanced Capability:

5.0SMDJ20A (Taiwan Semiconductor Corporation) and 5.0SMDJ20A-T7 (Littelfuse Inc.) provide 5000W peak pulse power with 155A peak pulse current. These parts accommodate higher transient energy levels while maintaining 20V reverse standoff and 22.2V minimum breakdown voltage. Operating temperature ranges are -55°C to 175°C and -65°C to 150°C respectively.

For Standard Industrial Applications:

SMCJ20A-TP from Micro Commercial Co offers the widest operating temperature range among lower-power options (-55°C to 175°C) with 1500W peak pulse power and 46.3A peak pulse current. This part balances cost and performance for general-purpose transient suppression.

All substitute parts maintain RoHS3 compliance and MSL Level 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can SMLJ20E3/TR13 replace 3KASMC20AHM3_A/I in all applications?

A: SMLJ20E3/TR13 matches the clamping voltage (35.8V) and peak pulse current (83.8A) but operates at significantly reduced power dissipation (300W vs. 3000W). Substitution is valid only for applications where transient energy does not exceed 300W and operating temperature remains within -55°C to 150°C.

Q: What is the difference between Category A and Category B substitutes?

A: Category A substitutes (SMLJ20E3/TR13) maintain 35.8V clamping voltage identical to the original part. Category B substitutes operate at 32.4V clamping voltage, which is lower but still within the same voltage class. Category B parts are suitable when the application circuit can tolerate the reduced clamping point.

Q: Is 3KASMC20AHM3_B/I a direct replacement?

A: 3KASMC20AHM3_B/I is the active successor from Vishay with identical automotive qualification and temperature range. The primary difference is reduced clamping voltage (32.4V vs. 35.8V) and increased peak pulse current (92.6A vs. 83.8A). It is the recommended replacement for automotive applications requiring AEC-Q101 qualification.

Q: Why do some substitutes have higher power ratings (5000W)?

A: Higher power-rated parts (5.0SMDJ20A series) accommodate applications with greater transient energy requirements. These parts use different internal structures to dissipate more energy. Selection depends on actual transient pulse characteristics in the application circuit.

Q: Are all substitutes in the same DO-214AB package?

A: Yes, all listed substitutes use the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility. Mounting type is surface mount for all parts.

Q: What compliance certifications apply to these substitutes?

A: All substitutes are RoHS3 compliant and carry MSL Level 1 moisture sensitivity rating. The 3KASMC20AHM3_B/I maintains AEC-Q101 automotive qualification. Other substitutes are qualified for general-purpose and industrial applications.

Q: Can I use SMCJ20A-TP in place of the automotive-grade original?

A: SMCJ20A-TP is not automotive-qualified and lacks AEC-Q101 certification. It is suitable for general-purpose applications but not for automotive designs requiring AEC-Q101 compliance. For automotive applications, use 3KASMC20AHM3_B/I.

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