3KASMC17HE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC17HE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 17V reverse standoff voltage class and is designed for transient overvoltage protection in electronic circuits. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KASMC17HE3_A/I
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	17V
Voltage - Breakdown (Min)	18.9V
Voltage - Clamping (Max) @ Ipp	30.5V
Current - Peak Pulse (10/1000µs)	98.4A
Power - Peak Pulse	3000W (3kW)
Operating Temperature	-65°C ~ 185°C (TJ)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Product Status	Obsolete
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 3KASMC17HE3_A/I is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - Reverse Standoff (Typ): 17V (all substitutes must match)
Voltage - Breakdown (Min): 18.9V (all substitutes must match)
Unidirectional channel configuration (single channel required)
Type: Zener diode

Mechanical Compatibility Requirements:

Package / Case: DO-214AB, SMC (surface mount form factor)
Mounting Type: Surface Mount

Performance Considerations:

Voltage - Clamping (Max) @ Ipp: Substitutes may vary (27.6V to 30.5V acceptable range)
Current - Peak Pulse (10/1000µs): Substitutes may equal or exceed original specification
Power - Peak Pulse: Substitutes may equal or exceed original specification (1.5kW to 5kW range acceptable)
Operating Temperature: Substitutes must support minimum -55°C to 150°C range

Substitutes are grouped into two categories: direct Vishay alternatives (same manufacturer, active status) and cross-manufacturer equivalents (alternative suppliers, active status). All substitutes maintain the 17V voltage class and DO-214AB package form factor.

Parameter Comparison

Parameter	3KASMC17HE3_A/I	3KASMC17AHE3_B/I	5.0SMDJ17A	5.0SMDJ17A-T7	SMCJ16A	SMCJ17A	SMCJ17A-HR	SMCJ17A-HRA	SMCJ17A-HRAT7
Manufacturer	Vishay	Vishay	Taiwan Semiconductor	Littelfuse	EVVO Semi	Fairchild	Littelfuse	Littelfuse	Littelfuse
Voltage - Reverse Standoff (Typ)	17V	17V	17V	17V	16V	17V	17V	17V	17V
Voltage - Breakdown (Min)	18.9V	18.9V	18.9V	18.9V	17.8V	18.9V	18.9V	18.9V	18.9V
Voltage - Clamping (Max) @ Ipp	30.5V	27.6V	27.6V	27.6V	26V	27.6V	27.6V	27.6V	27.6V
Current - Peak Pulse (10/1000µs)	98.4A	109A	181A	181A	57.7A	54.4A	54.4A	54.4A	54.4A
Power - Peak Pulse	3000W	3000W	5000W	5000W	600W	1500W	1500W	1500W	1500W
Operating Temperature	-65°C ~ 185°C	-65°C ~ 185°C	-55°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMCJ	DO-214AC, SMA	DO-214AB, SMC	DO-214AB, SMCJ	DO-214AB, SMCJ	DO-214AB, SMCJ
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Grade	Automotive	Automotive	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Qualification	AEC-Q101	AEC-Q101	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Vishay Direct Substitute: The 3KASMC17AHE3_B/I is the direct Vishay equivalent with active product status. It maintains identical voltage specifications (17V reverse standoff, 18.9V breakdown minimum) and automotive-grade qualification (AEC-Q101). The clamping voltage is reduced to 27.6V with increased peak pulse current to 109A, both improvements over the original specification. This part is ROHS3 compliant and available in Tape & Reel packaging.

Secondary Recommendations - Enhanced Performance: The 5.0SMDJ17A (Taiwan Semiconductor) and 5.0SMDJ17A-T7 (Littelfuse) offer higher power dissipation (5000W versus 3000W) while maintaining the 17V voltage class and DO-214AB package. These parts are suitable for applications requiring greater transient energy absorption. The 5.0SMDJ17A-T7 provides extended temperature range (-65°C to 150°C) and ROHS3 compliance.

Alternative Consideration: The SMCJ17A series (Fairchild, Littelfuse variants SMCJ17A-HR, SMCJ17A-HRA, SMCJ17A-HRAT7) maintains full electrical compatibility with reduced power rating (1500W). These are appropriate for applications where the original 3000W specification exceeds circuit requirements. Littelfuse variants include ROHS3 compliance and extended temperature range support.

Not Recommended: The SMCJ16A (EVVO Semi) operates at 16V reverse standoff voltage, which does not meet the 17V specification requirement and is therefore not electrically equivalent.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ16A as a substitute for 3KASMC17HE3_A/I? A: No. The SMCJ16A operates at 16V reverse standoff voltage, while the original part requires 17V. This voltage mismatch creates incompatibility in circuit protection performance and is not an acceptable substitute.

Q: What is the difference between the 3KASMC17AHE3_B/I and the 5.0SMDJ17A? A: Both maintain the 17V voltage class and DO-214AB package. The primary difference is power dissipation: 3KASMC17AHE3_B/I handles 3000W peak pulse power, while 5.0SMDJ17A handles 5000W. The 5.0SMDJ17A is suitable for higher transient energy applications. The 3KASMC17AHE3_B/I retains automotive-grade AEC-Q101 qualification.

Q: Are all substitute parts ROHS3 compliant? A: Most substitutes are ROHS3 compliant. The Fairchild SMCJ17A variants do not specify RoHS status in the provided data. Verify RoHS compliance with the supplier if this is a requirement for your application.

Q: Can I use the SMCJ17A-HR in place of the original part? A: Yes, electrically and mechanically. The SMCJ17A-HR maintains the 17V voltage class, 18.9V breakdown minimum, and DO-214AB package. However, it has reduced power rating (1500W versus 3000W) and is not automotive-grade qualified. Use only if your circuit does not require the original power dissipation or automotive qualification.

Q: What is the temperature range difference between substitutes? A: The original 3KASMC17HE3_A/I operates from -65°C to 185°C. Most substitutes operate from -65°C to 150°C or -55°C to 150°C. If your application requires operation above 150°C, the 3KASMC17AHE3_B/I (-65°C to 185°C) or 5.0SMDJ17A-T7 (-65°C to 150°C) are appropriate choices.

Q: Do all substitutes use the same DO-214AB package? A: Yes, all recommended substitutes use DO-214AB (SMC or SMCJ variant) surface mount packaging. The SMCJ16A uses DO-214AC (SMA) packaging and is not mechanically compatible. Verify PCB footprint compatibility before selection.

Q: Which substitute has the highest peak pulse current rating? A: The 5.0SMDJ17A and 5.0SMDJ17A-T7 both handle 181A peak pulse current, compared to 98.4A for the original part. These are suitable for circuits requiring higher transient current absorption.

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