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Equivalent & Substitute Parts for 3KASMC14AHM3_A/I
Part Overview
The 3KASMC14AHM3_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 is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across an automotive-grade temperature range with AEC-Q101 qualification, making it suitable for demanding transient protection applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 3KASMC14AHM3_A/I |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Product Status | Obsolete |
| Type | Zener, Unidirectional |
| Voltage - Reverse Standoff (Typ) | 14V |
| Voltage - Breakdown (Min) | 15.6V |
| Voltage - Clamping (Max) @ Ipp | 23.2V |
| Current - Peak Pulse (10/1000µs) | 129A |
| Power - Peak Pulse | 3000W (3kW) |
| Operating Temperature | -65°C ~ 185°C (TJ) |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AB, SMC |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 3KASMC14AHM3_A/I is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 14V
- Voltage - Breakdown (Min): 15.6V
- Voltage - Clamping (Max) @ Ipp: 23.2V
- Unidirectional Channels: 1
- Mounting Type: Surface Mount
- Package / Case: DO-214AB, SMC
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Substitute parts are grouped into two categories based on electrical performance:
Category A - Direct Electrical Equivalents (129A Peak Pulse Current): Parts maintaining the original 129A peak pulse current specification and 3000W power rating, ensuring identical transient suppression capability.
Category B - Reduced Performance Substitutes (64.66A - 64.7A Peak Pulse Current): Parts with lower peak pulse current ratings (approximately 50% of original) and 1500W power rating, suitable for applications with reduced transient energy requirements.
Category C - Enhanced Performance Substitute (216A Peak Pulse Current): Part with higher peak pulse current rating and 5000W power rating, providing increased transient suppression margin.
All substitute parts maintain the critical voltage parameters (14V standoff, 15.6V breakdown, 23.2V clamping) and surface mount DO-214AB packaging, ensuring mechanical and electrical compatibility.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Product Status | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Grade | Qualification | Package / Case | RoHS Status | MSL |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3KASMC14AHM3_A/I | Vishay General Semiconductor - Diodes Division | Obsolete | 14V | 15.6V | 23.2V | 129A | 3000W | -65°C ~ 185°C | Automotive | AEC-Q101 | DO-214AB, SMC | ROHS3 Compliant | 1 |
| 3KASMC14AHM3_B/I | Vishay General Semiconductor - Diodes Division | Active | 14V | 15.6V | 23.2V | 129A | 3000W | -65°C ~ 185°C | Automotive | AEC-Q101 | DO-214AB, SMC | ROHS3 Compliant | 1 |
| 5.0SMDJ14A | MDE Semiconductor Inc | Active | 14V | 15.6V | 23.2V | 216A | 5000W | -55°C ~ 150°C | — | — | DO-214AB, SMC | ROHS3 Compliant | 1 |
| SMCJ14A | Meritek | Active | 14V | 15.6V | 23.2V | 64.66A | 1500W | -55°C ~ 150°C | — | — | DO-214AB, SMC | ROHS3 Compliant | 1 |
| SMCJ14A-13-F | Diodes Incorporated | Active | 14V | 15.6V | 23.2V | 64.7A | 1500W | -55°C ~ 150°C | — | — | DO-214AB, SMC | ROHS3 Compliant | 1 |
| SMCJ14A-HR | Littelfuse Inc. | Active | 14V | 15.6V | 23.2V | 64.7A | 1500W | -65°C ~ 150°C | — | — | DO-214AB, SMC | ROHS3 Compliant | 1 |
| SMCJ14A-HRA | Littelfuse Inc. | Active | 14V | 15.6V | 23.2V | 64.7A | 1500W | -65°C ~ 150°C | — | — | DO-214AB, SMC | ROHS3 Compliant | 1 |
| SMCJ14A-HRAT7 | Littelfuse Inc. | Active | 14V | 15.6V | 23.2V | 64.7A | 1500W | -65°C ~ 150°C | — | — | DO-214AB, SMC | ROHS3 Compliant | 1 |
| SMDJ14A | Alpha & Omega Semiconductor Inc. | Active | 14V | 15.6V | 23.2V | 129.4A | 3000W | -55°C ~ 150°C | — | — | DO-214AB, SMC | ROHS3 Compliant | — |
Engineering Selection Recommendations
Primary Recommendation - Direct Replacement: The 3KASMC14AHM3_B/I is the direct active equivalent from Vishay General Semiconductor - Diodes Division. This part maintains identical electrical specifications (129A peak pulse, 3000W power), automotive-grade qualification (AEC-Q101), and extended operating temperature range (-65°C ~ 185°C). The only difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel). This part is the preferred choice for designs requiring automotive-grade compliance and thermal performance matching the original specification.
Alternative - Equivalent Performance: The SMDJ14A from Alpha & Omega Semiconductor Inc. provides equivalent electrical performance (129.4A peak pulse, 3000W power) and maintains the critical voltage parameters. However, this part operates within a reduced temperature range (-55°C ~ 150°C) and lacks documented automotive-grade qualification. Selection of this part requires confirmation that the reduced temperature range and absence of AEC-Q101 qualification are acceptable for the target application.
Alternative - Reduced Performance: The SMCJ14A-HRAT7 from Littelfuse Inc., SMCJ14A-13-F from Diodes Incorporated, and SMCJ14A variants from Meritek provide reduced peak pulse current (64.7A) and power rating (1500W), representing approximately 50% of the original specification. These parts are suitable only for applications where transient energy requirements are lower than the original design. The Littelfuse SMCJ14A-HR and SMCJ14A-HRA variants maintain the extended temperature range (-65°C ~ 150°C) matching the original part's lower bound.
Alternative - Enhanced Performance: The 5.0SMDJ14A from MDE Semiconductor Inc. provides enhanced transient suppression capability (216A peak pulse, 5000W power) while maintaining voltage parameters. This part operates within a reduced temperature range (-55°C ~ 150°C) and lacks automotive-grade qualification. Selection requires confirmation that enhanced performance margin and reduced temperature range are compatible with the application.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with lower peak pulse current (64.7A vs. 129A)? A: Substitution with reduced peak pulse current parts is only valid if the application's transient energy requirements are lower than the original design specification. The 64.7A variants provide approximately 50% of the original current-handling capability. Application circuit analysis is required to confirm adequacy.
Q: What is the difference between 3KASMC14AHM3_A/I and 3KASMC14AHM3_B/I? A: Both parts are electrically identical with matching voltage parameters, peak pulse current (129A), and power rating (3000W). The primary difference is product status: the _A/I variant is obsolete, while the _B/I variant is active. The _B/I variant uses Tape & Reel packaging, whereas the _A/I packaging format is not specified. The _B/I is the recommended direct replacement.
Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts are RoHS3 compliant and maintain Moisture Sensitivity Level 1 (Unlimited), matching the original part's environmental compliance profile.
Q: Which substitute parts maintain automotive-grade qualification? A: Only the 3KASMC14AHM3_B/I from Vishay maintains documented AEC-Q101 automotive-grade qualification. Alternative parts from other manufacturers do not list automotive-grade qualification in the provided specifications. Applications requiring automotive-grade compliance should prioritize the Vishay _B/I variant.
Q: What is the temperature range difference between substitute parts? A: The original 3KASMC14AHM3_A/I operates from -65°C to 185°C. Most substitute parts operate within -55°C to 150°C, representing a reduced upper temperature limit of 35°C. The Littelfuse SMCJ14A-HR, SMCJ14A-HRA, and SMCJ14A-HRAT7 variants extend the lower bound to -65°C, matching the original part's cold-temperature performance.
Q: Can I use the 5.0SMDJ14A for higher transient protection margin? A: The 5.0SMDJ14A provides enhanced peak pulse current (216A) and power rating (5000W), offering increased transient suppression margin. However, this part operates within a reduced temperature range (-55°C ~ 150°C) and lacks automotive-grade qualification. Use is limited to applications where the reduced temperature range and absence of automotive certification are acceptable.
Q: Are all substitute parts available in DO-214AB (SMC) package? A: All listed substitute parts are specified for DO-214AB (SMC) surface mount packaging, ensuring mechanical compatibility with the original design. Verify specific packaging format (Tape & Reel, Cut Tape, or bulk) availability with suppliers based on procurement requirements.
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