3KASMC11HE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC11HE3_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 operates with an 11V reverse standoff voltage and provides 20.1V maximum clamping voltage at peak pulse current of 149A, delivering 3000W peak pulse power dissipation. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	11	V
Voltage - Breakdown (Min)	12.2	V
Voltage - Clamping (Max) @ Ipp	20.1	V
Current - Peak Pulse (10/1000µs)	149	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65 to 185	°C (TJ)
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the 3KASMC11HE3_A/I is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff: 11V (all substitutes must match)
Voltage - Breakdown (Min): 12.2V (all substitutes must match)
Package / Case: DO-214AB, SMC (all substitutes must match)
Unidirectional Channels: 1 (all substitutes must match)
Type: Zener (all substitutes must match)

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 18.2V to 20.1V range acceptable
Current - Peak Pulse (10/1000µs): 82.5A to 165A range acceptable
Power - Peak Pulse: 1500W to 3000W range acceptable
Operating Temperature Range: Minimum -55°C acceptable; maximum 150°C to 185°C acceptable

Substitute parts are grouped into two categories based on power dissipation capability: 3000W class (full power equivalents) and 1500W class (reduced power alternatives). All listed substitutes maintain the same voltage rating, package form factor, and unidirectional topology.

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Voltage Breakdown Min (V)	Voltage Clamp Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Temp Range (°C)	Package	Status
3KASMC11HE3_A/I	Vishay	11	12.2	20.1	149	3000	-65 to 185	DO-214AB	Obsolete
3KASMC11AHE3_B/I	Vishay	11	12.2	18.2	165	3000	-65 to 185	DO-214AB	Active
SMDJ11A	Alpha & Omega Semiconductor	11	12.2	18.2	164.9	3000	-55 to 150	DO-214AB	Active
SMDJ11A-HR	Littelfuse	11	12.2	18.2	164.8	3000	-65 to 150	DO-214AB	Active
SMDJ11A-HRA	Littelfuse	11	12.2	18.2	164.8	3000	-65 to 150	DO-214AB	Active
SMCJ11A	Fairchild Semiconductor	11	12.2	18.2	82.5	1500	-55 to 150	DO-214AB	Active
SMCJ11A-HRA	Littelfuse	11	12.2	18.2	82.5	1500	-65 to 150	DO-214AB	Active
SMCJ11A-HRAT7	Littelfuse	11	12.2	18.2	82.5	1500	-65 to 150	DO-214AB	Active
SMCJ11A-TP	Micro Commercial Co	11	12.2	18.2	82.5	1500	-55 to 175	DO-214AB	Active

Engineering Selection Recommendations

Primary Recommendation - Full Power Equivalents (3000W Class):

The 3KASMC11AHE3_B/I from Vishay is the direct successor to the obsolete 3KASMC11HE3_A/I. Both parts share identical voltage ratings, package form factor, and power dissipation capability. The 3KASMC11AHE3_B/I is active and maintains Vishay manufacturing continuity with AEC-Q101 automotive qualification and ROHS3 compliance.

SMDJ11A variants from Alpha & Omega Semiconductor and Littelfuse (SMDJ11A-HR, SMDJ11A-HRA) provide equivalent 3000W peak pulse power with nearly identical peak pulse current specifications (164.8A to 164.9A). These parts maintain the same voltage ratings and DO-214AB package. Littelfuse variants extend the lower temperature limit to -65°C, matching the original part's thermal range.

Secondary Recommendation - Reduced Power Alternatives (1500W Class):

SMCJ11A variants from Fairchild Semiconductor, Littelfuse (SMCJ11A-HRA, SMCJ11A-HRAT7), and Micro Commercial Co (SMCJ11A-TP) are suitable only for applications where peak pulse power dissipation does not exceed 1500W. These parts maintain voltage compatibility and package form factor but operate at half the power rating (82.5A peak pulse current versus 149A to 165A). The SMCJ11A-TP variant from Micro Commercial Co offers the widest operating temperature range (-55°C to 175°C).

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. Littelfuse variants provide AEC-Q101 automotive qualification equivalent to the original part. Selection should prioritize parts matching the original's thermal and power requirements for the specific application.

Frequently Asked Questions (FAQ)

Q: Can SMCJ11A (1500W) parts replace the 3KASMC11HE3_A/I (3000W) in all applications?

A: No. SMCJ11A variants are suitable only for applications where peak pulse power dissipation does not exceed 1500W. The original part is rated for 3000W peak pulse power. Use SMCJ11A only if your circuit design confirms power dissipation remains below 1500W.

Q: What is the difference between SMDJ11A and SMCJ11A?

A: Both maintain identical voltage ratings (11V standoff, 12.2V breakdown, 18.2V clamp) and DO-214AB package. The primary difference is peak pulse power: SMDJ11A is rated 3000W with 164.8A to 164.9A peak pulse current, while SMCJ11A is rated 1500W with 82.5A peak pulse current.

Q: Are Littelfuse SMDJ11A-HR and SMDJ11A-HRA interchangeable?

A: Yes. Both parts share identical electrical specifications (11V standoff, 12.2V breakdown, 18.2V clamp, 164.8A peak pulse current, 3000W power) and DO-214AB package. The designation difference reflects internal manufacturing or qualification variants but does not affect electrical performance or compatibility.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range affects suitability for specific applications but does not prevent substitution if your circuit operates within the substitute part's specified range. The original 3KASMC11HE3_A/I operates -65°C to 185°C. SMDJ11A variants operate -55°C to 150°C. Verify your application's temperature requirements before selection.

Q: Why is the 3KASMC11AHE3_B/I recommended over other substitutes?

A: The 3KASMC11AHE3_B/I is the direct Vishay successor to the obsolete 3KASMC11HE3_A/I, maintaining manufacturing continuity, identical voltage ratings, identical power rating (3000W), and identical package form factor. It is active and carries AEC-Q101 automotive qualification.

Q: Can I use SMCJ11A-TP if my application requires -65°C operation?

A: No. SMCJ11A-TP operates -55°C to 175°C. The lower temperature limit is -55°C, not -65°C. If your application requires -65°C operation, select SMDJ11A-HR, SMDJ11A-HRA, SMCJ11A-HRA, or SMCJ11A-HRAT7, which all specify -65°C minimum operating temperature.

Q: Are all substitute parts available in Tape & Reel packaging?

A: No. SMCJ11A from Fairchild Semiconductor is supplied in Bulk packaging. SMDJ11A, SMDJ11A-HR, SMDJ11A-HRA, SMCJ11A-HRA, SMCJ11A-HRAT7, and SMCJ11A-TP are supplied in Tape & Reel (TR) packaging. Verify packaging requirements for your procurement and assembly process.

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