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3KASMC30HE3_A/I Equivalent & Substitute Parts
Part Overview
The 3KASMC30HE3_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 (SMCJ) package. This component operates with a 30V reverse standoff voltage and provides transient protection with a 53.5V maximum clamping voltage at peak pulse current of 56.1A. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 30V |
| Voltage - Breakdown (Min) | 33.3V |
| Voltage - Clamping (Max) @ Ipp | 53.5V |
| Current - Peak Pulse (10/1000µs) | 56.1A |
| Power - Peak Pulse | 3000W |
| Operating Temperature Range | -65°C ~ 185°C (TJ) |
| Package / Case | DO-214AB, SMC |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Grade | Automotive |
| Qualification | AEC-Q101 |
Substitute Part Grouping Explanation
Substitution of the 3KASMC30HE3_A/I is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Voltage - Reverse Standoff: 30V (nominal)
- Voltage - Breakdown (Min): 33.3V
- Unidirectional channel configuration (1 channel)
- Type: Zener diode
Mechanical & Package Compatibility:
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
Environmental & Compliance Requirements:
- RoHS3 Compliant
- Operating Temperature: -65°C minimum to 150°C minimum (acceptable range overlap)
Substitute parts are grouped into two categories based on clamping voltage performance and peak pulse power handling:
Group A (3kW Peak Pulse Power, 48.4V Clamping): Parts with reduced clamping voltage (48.4V) and maintained 3000W peak pulse power. These include 3KASMC30AHE3_B/I, 3.0SMCJ30A-13, 3SMC30A BK PBFREE, 3SMC30A TR13 PBFREE, SM30T35AY, and SMC30J30A.
Group B (5kW Peak Pulse Power, 48.4V Clamping): Parts with higher peak pulse power rating (5000W) and 48.4V clamping voltage. These include 5.0SMDJ30A and 5.0SMDJ30A-T7.
Group C (Lower Peak Pulse Power, 48.4V Clamping): Parts with reduced peak pulse power (1500W) and lower peak pulse current (31A). This includes 1SMC30A TR13 PBFREE.
Group D (Higher Clamping Voltage, 62V): Part with elevated clamping voltage (62V) and higher peak pulse current (420A at 8/20µs). This includes 3.0SMC30A.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse | Power - Peak Pulse | Operating Temperature | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 3KASMC30HE3_A/I | Vishay General Semiconductor | 30V | 33.3V | 53.5V | 56.1A | 3000W | -65°C ~ 185°C | DO-214AB (SMCJ) | Obsolete | ROHS3 |
| 3KASMC30AHE3_B/I | Vishay General Semiconductor | 30V | 33.3V | 48.4V | 62A | 3000W | -65°C ~ 185°C | DO-214AB (SMC) | Active | ROHS3 |
| 1SMC30A TR13 PBFREE | Central Semiconductor Corp | 30V | 33.3V | 48.4V | 31A | 1500W | -65°C ~ 150°C | DO-214AB (SMC) | Active | ROHS3 |
| 3.0SMC30A | Littelfuse Inc. | 30V | 33.3V | 62V | 420A (8/20µs) | - | -65°C ~ 150°C | DO-214AB (SMCJ) | Active | ROHS3 |
| 3.0SMCJ30A-13 | Diodes Incorporated | 30V | 33.3V | 48.4V | 62A | 3000W | -55°C ~ 175°C | DO-214AB (SMC) | Active | ROHS3 |
| 3SMC30A BK PBFREE | Central Semiconductor Corp | 30V | 33.3V | 48.4V | 62A | 3000W | -65°C ~ 150°C | DO-214AB (SMC) | Active | ROHS3 |
| 3SMC30A TR13 PBFREE | Central Semiconductor Corp | 30V | 33.3V | 48.4V | 62A | 3000W | -65°C ~ 150°C | DO-214AB (SMC) | Active | ROHS3 |
| 5.0SMDJ30A | Taiwan Semiconductor Corporation | 30V | 33.3V | 48.4V | 103A | 5000W | -55°C ~ 175°C | DO-214AB (SMC) | Active | ROHS3 |
| 5.0SMDJ30A-T7 | Littelfuse Inc. | 30V | 33.3V | 48.4V | 103A | 5000W | -65°C ~ 150°C | DO-214AB (SMCJ) | Active | ROHS3 |
| SM30T35AY | STMicroelectronics | 30V | 33.3V | 48.4V | 62A | 3000W | -55°C ~ 175°C | DO-214AB (SMC) | Active | ROHS3 |
| SMC30J30A | STMicroelectronics | 30V | 33.3V | 48.4V | 62A | 3000W | -55°C ~ 175°C | DO-214AB (SMC) | Active | ROHS3 |
Engineering Selection Recommendations
Primary Recommendation - Direct Electrical & Thermal Match: 3KASMC30AHE3_B/I (Vishay General Semiconductor) is the preferred direct substitute. It maintains the same manufacturer lineage, automotive grade qualification (AEC-Q101), identical reverse standoff voltage (30V), and equivalent operating temperature range (-65°C ~ 185°C). The reduced clamping voltage (48.4V vs. 53.5V) and increased peak pulse current (62A vs. 56.1A) provide enhanced transient suppression performance within the same 3000W power envelope and DO-214AB package footprint.
Secondary Recommendations - Active Alternatives with Equivalent Performance: For applications requiring 3000W peak pulse power and 48.4V clamping voltage, the following active parts provide direct functional equivalence:
- 3.0SMCJ30A-13 (Diodes Incorporated): Maintains 3000W power rating with extended operating temperature range (-55°C ~ 175°C)
- 3SMC30A TR13 PBFREE (Central Semiconductor Corp): Tape & Reel packaging option with 3000W power rating
- SM30T35AY (STMicroelectronics): Automotive-grade alternative with AEC-Q101 qualification and TRANSIL™ series designation
- SMC30J30A (STMicroelectronics): General-purpose alternative with equivalent electrical specifications
Higher Power Alternative: For applications requiring enhanced transient energy absorption, 5.0SMDJ30A or 5.0SMDJ30A-T7 provide 5000W peak pulse power with 103A peak pulse current, maintaining the 30V reverse standoff voltage and 48.4V clamping voltage in the same DO-214AB package.
Lower Power Alternative: 1SMC30A TR13 PBFREE (Central Semiconductor Corp) is suitable only for applications with reduced transient energy requirements, offering 1500W peak pulse power and 31A peak pulse current.
Not Recommended for Direct Substitution: 3.0SMC30A (Littelfuse Inc.) exhibits significantly elevated clamping voltage (62V) and peak pulse current (420A at 8/20µs specification), making it unsuitable for circuits designed for the original 53.5V clamping characteristic.
Frequently Asked Questions (FAQ)
Q: Can I use 3KASMC30AHE3_B/I as a direct replacement for 3KASMC30HE3_A/I? A: Yes. Both parts share identical reverse standoff voltage (30V), breakdown voltage (33.3V), and operating temperature range (-65°C ~ 185°C). The 3KASMC30AHE3_B/I is the active successor from the same manufacturer with improved specifications (lower clamping voltage, higher peak pulse current) within the same 3000W power class and DO-214AB package.
Q: What is the difference between DO-214AB (SMCJ) and DO-214AB (SMC) packaging? A: Both designations refer to the same physical DO-214AB package footprint used for surface mount TVS diodes. The SMCJ and SMC suffixes indicate manufacturer-specific package designations but are mechanically and electrically compatible for PCB assembly purposes.
Q: Why do some substitute parts have lower clamping voltages (48.4V vs. 53.5V)? A: Lower clamping voltage indicates more aggressive transient suppression, clamping voltage spikes to a lower level. This is generally beneficial for circuit protection, as it reduces the peak voltage stress on protected components. Verify that your circuit design can tolerate the lower clamping voltage threshold.
Q: Can I use the 5.0SMDJ30A series for higher transient energy applications? A: Yes, if your circuit design permits. The 5.0SMDJ30A and 5.0SMDJ30A-T7 provide 5000W peak pulse power (versus 3000W in the original part) with 103A peak pulse current. These parts maintain the same 30V reverse standoff voltage and 48.4V clamping voltage, making them suitable for circuits requiring enhanced transient energy absorption in the same package footprint.
Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 Compliant status, ensuring compatibility with RoHS3 regulatory requirements.
Q: Which substitute part offers the best automotive-grade qualification? A: Both 3KASMC30AHE3_B/I (Vishay) and SM30T35AY (STMicroelectronics) carry AEC-Q101 automotive qualification. For automotive applications, these two parts are the preferred selections among the substitute options.
Q: What is the operating temperature difference between the original part and substitutes? A: The original 3KASMC30HE3_A/I operates from -65°C to 185°C. Most substitute parts operate from -65°C to 150°C or -55°C to 175°C. Verify that your application's temperature requirements fall within the selected substitute part's operating range.
Q: Can I use 1SMC30A TR13 PBFREE as a substitute? A: Only if your application has reduced transient energy requirements. This part provides 1500W peak pulse power and 31A peak pulse current, compared to the original 3000W and 56.1A. Use only if circuit analysis confirms adequate protection at these reduced ratings.
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