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Equivalent & Substitute Parts for 3KASMC22HE3_A/I
Part Overview
The 3KASMC22HE3_A/I is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 22V reverse standoff with a 39.4V maximum clamping voltage. This component is designed for surface mount applications in the DO-214AB (SMCJ) package and carries automotive-grade qualification (AEC-Q101). The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 3KASMC22HE3_A/I |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Package / Case | DO-214AB, SMC |
| Voltage - Reverse Standoff (Typ) | 22V |
| Voltage - Breakdown (Min) | 24.4V |
| Voltage - Clamping (Max) @ Ipp | 39.4V |
| Current - Peak Pulse (10/1000µs) | 76.1A |
| Power - Peak Pulse | 3000W (3kW) |
| Operating Temperature Range | -65°C ~ 185°C (TJ) |
| Mounting Type | Surface Mount |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the 3KASMC22HE3_A/I is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 22V
- Voltage - Breakdown (Min): 24.4V
- Package / Case: DO-214AB, SMC (surface mount compatibility)
- Mounting Type: Surface Mount
- Type: Zener (unidirectional)
- Unidirectional Channels: 1
Substitute parts are grouped into two categories based on electrical performance characteristics:
Category A: Direct Electrical Equivalents — Parts with matching or superior clamping voltage (35.5V) and comparable peak pulse current ratings (42.2A to 84.5A). These parts maintain the same reverse standoff and breakdown voltages while offering improved or equivalent transient suppression performance.
Category B: Enhanced Performance Alternatives — Parts with higher peak pulse current ratings (141A) or higher clamping voltages (48.3V), suitable for applications requiring greater transient energy dissipation capacity while maintaining the same voltage protection threshold.
All substitute parts maintain DO-214AB (SMC) package compatibility, surface mount configuration, and ROHS3 compliance.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature Range | Product Status |
|---|---|---|---|---|---|---|---|---|
| 3KASMC22HE3_A/I | Vishay General Semiconductor - Diodes Division | 22V | 24.4V | 39.4V | 76.1A | 3000W | -65°C ~ 185°C | Obsolete |
| 3KASMC22AHE3_B/I | Vishay General Semiconductor - Diodes Division | 22V | 24.4V | 35.5V | 84.5A | 3000W | -65°C ~ 185°C | Active |
| 3.0SMCJ22A-13 | Diodes Incorporated | 22V | 24.4V | 35.5V | 84.5A | 3000W | -55°C ~ 175°C | Discontinued at DiGi Electronics |
| 5.0SMDJ22A | Taiwan Semiconductor Corporation | 22V | 24.4V | 35.5V | 141A | 5000W | -55°C ~ 175°C | Active |
| SMCJ22A | Fairchild Semiconductor | 22V | 24.4V | 35.5V | 42.3A | 1500W | -55°C ~ 150°C | Active |
| SMCJ22A-13-F | Diodes Incorporated | 22V | 24.4V | 35.5V | 42.2A | 1500W | -55°C ~ 150°C | Active |
| SMCJ22A-HR | Littelfuse Inc. | 22V | 24.4V | 35.5V | 42.3A | 1500W | -65°C ~ 150°C | Active |
| SMCJ22A-HRA | Littelfuse Inc. | 22V | 24.4V | 35.5V | 42.3A | 1500W | -65°C ~ 150°C | Active |
| SMCJ22A-HRAT7 | Littelfuse Inc. | 22V | 24.4V | 35.5V | 42.3A | 1500W | -65°C ~ 150°C | Active |
| SMCJ22A-TR | STMicroelectronics | 22V | 24.4V | 48.3V | 207A (8/20µs) | 1500W | -55°C ~ 150°C | Active |
Engineering Selection Recommendations
Primary Recommendation: 3KASMC22AHE3_B/I
The 3KASMC22AHE3_B/I from Vishay General Semiconductor - Diodes Division is the direct successor to the obsolete 3KASMC22HE3_A/I. This part maintains identical voltage specifications (22V reverse standoff, 24.4V breakdown minimum) and operating temperature range (-65°C ~ 185°C), preserving full automotive-grade qualification (AEC-Q101). The clamping voltage is reduced from 39.4V to 35.5V, while peak pulse current increases from 76.1A to 84.5A, delivering equivalent 3000W peak pulse power. Product status is Active with 1081 units in stock.
Secondary Recommendation: 5.0SMDJ22A
The 5.0SMDJ22A from Taiwan Semiconductor Corporation provides enhanced transient suppression capability with 141A peak pulse current and 5000W peak pulse power, maintaining the same 22V reverse standoff and 35.5V clamping voltage. This part is suitable for applications requiring higher energy dissipation margins. Product status is Active with 9200 units in stock. Operating temperature range is -55°C ~ 175°C.
Alternative Recommendations: SMCJ22A-HR, SMCJ22A-HRA, SMCJ22A-HRAT7
These Littelfuse Inc. parts (SMCJ-HR and SMCJ-HRA series) maintain the same voltage specifications and offer extended lower temperature operation (-65°C minimum). Peak pulse current is 42.3A with 1500W peak pulse power. These parts are suitable for cost-optimized designs where the original 3000W power rating is not required. All three variants are Active with inventory ranging from 888 to 1006 units.
Alternative Recommendation: SMCJ22A-13-F
The SMCJ22A-13-F from Diodes Incorporated provides equivalent electrical performance with 42.2A peak pulse current and 1500W peak pulse power. This part is Active with 6927 units in stock and offers a cost-effective alternative for applications not requiring the full 3000W power rating.
Alternative Recommendation: SMCJ22A-TR
The SMCJ22A-TR from STMicroelectronics offers the highest peak pulse current (207A at 8/20µs) and highest clamping voltage (48.3V) among available substitutes. This part is suitable for applications requiring maximum transient suppression performance. Product status is Active with 7600 units in stock.
All recommended substitutes maintain DO-214AB (SMC) package compatibility, surface mount configuration, ROHS3 compliance, and unidirectional (1 channel) Zener diode topology.
Frequently Asked Questions (FAQ)
Q: Can I use SMCJ22A parts as direct replacements for the 3KASMC22HE3_A/I?
A: SMCJ22A parts from Fairchild Semiconductor maintain the same 22V reverse standoff and 24.4V breakdown voltage specifications and DO-214AB (SMC) package configuration. However, the peak pulse current is reduced to 42.3A and power rating to 1500W compared to the original 76.1A and 3000W. Substitution is valid only if your application does not require the full 3000W power dissipation capacity.
Q: What is the difference between the 3KASMC22AHE3_B/I and the original 3KASMC22HE3_A/I?
A: Both parts share identical voltage specifications (22V reverse standoff, 24.4V breakdown minimum, -65°C ~ 185°C operating range) and automotive qualification (AEC-Q101). The primary difference is the clamping voltage: 35.5V (newer part) versus 39.4V (original part). The newer part delivers higher peak pulse current (84.5A versus 76.1A) while maintaining the same 3000W peak pulse power rating. The original part is obsolete; the newer part is Active.
Q: Are all substitute parts automotive-grade qualified?
A: The 3KASMC22AHE3_B/I from Vishay carries AEC-Q101 qualification matching the original part. Other substitutes (Diodes Incorporated, Littelfuse, STMicroelectronics, Taiwan Semiconductor Corporation, Fairchild Semiconductor) are listed as Active or Discontinued but do not explicitly state AEC-Q101 qualification in the provided specifications. Verify automotive qualification requirements with your application specifications before selection.
Q: Can I use the 5.0SMDJ22A for higher transient energy applications?
A: Yes. The 5.0SMDJ22A delivers 141A peak pulse current and 5000W peak pulse power while maintaining the same 22V reverse standoff and 35.5V clamping voltage. This part is suitable for applications requiring greater transient energy dissipation. Operating temperature range is -55°C ~ 175°C, which is narrower than the original -65°C ~ 185°C range.
Q: What is the difference between SMCJ22A-HR, SMCJ22A-HRA, and SMCJ22A-HRAT7?
A: All three Littelfuse parts (SMCJ-HR and SMCJ-HRA series) share identical electrical specifications: 22V reverse standoff, 24.4V breakdown minimum, 35.5V clamping voltage, 42.3A peak pulse current, 1500W peak pulse power, and -65°C ~ 150°C operating temperature range. The designations represent different packaging or tape configurations. Electrical performance is equivalent across all three variants.
Q: Does the SMCJ22A-TR have a different clamping voltage than other substitutes?
A: Yes. The SMCJ22A-TR from STMicroelectronics has a maximum clamping voltage of 48.3V compared to 35.5V for most other substitutes and 39.4V for the original part. This higher clamping voltage, combined with 207A peak pulse current (8/20µs), makes it suitable for applications requiring maximum transient suppression performance. Operating temperature range is -55°C ~ 150°C.
Q: Are all substitute parts ROHS3 compliant?
A: All substitute parts listed carry ROHS3 compliance status, matching the original 3KASMC22HE3_A/I specification.
Q: What packaging options are available for substitutes?
A: All substitute parts use the DO-214AB (SMC) surface mount package, maintaining mechanical and electrical compatibility with the original part. Packaging format varies (Tape & Reel or Bulk), but the physical package remains identical.
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