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Vishay General Semiconductor - Diodes Division 3KASMC28AHM3_A/H
- Part No.:
- 3KASMC28AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHM3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,269
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Product details
Overview
3KASMC28AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 28 V stand-off voltage, 31.1–34.4 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 μs), and 185 °C maximum junction temperature - deployed for automotive-grade overvoltage protection of MOSFETs and sensor signal lines.
For engineers reviewing the 3KASMC28AHM3_A/H datasheet, 3KASMC28AHM3_A/H pinout, 3KASMC28AHM3_A/H application, or 3KASMC28AHM3_A/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance data, clamping performance at 66.1 A surge current, and real-world use context in high-reliability automotive and industrial systems.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to achieve stable clamping under repetitive transients while maintaining low incremental surge resistance and fast response time. Its unidirectional polarity and 185 °C TJ rating support operation in under-hood automotive environments where thermal derating and long-term reliability are critical.
The device meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility and passes JESD201 Class 2 whisker testing. It is RoHS-compliant and AEC-Q101 qualified, with a typical junction-to-ambient thermal resistance of 77.5 °C/W on standard PCB pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum reverse stand-off voltage before clamping begins; defines safe operating window for protected circuitry. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range ensures predictable turn-on during transient events. |
| PPPM | 3000 W (10/1000 μs) - Sustains high-energy surges common in automotive load-dump and inductive switching scenarios. |
| IPPM | 66.1 A - Peak pulse current corresponding to full 3000 W clamping capability; used for PCB trace sizing and layout validation. |
| VC | 45.4 V at IPPM - Clamped voltage level that determines maximum stress imposed on downstream ICs during surge. |
| TJ max | 185 °C - Enables continuous operation in high-temperature zones such as engine control units without thermal shutdown. |
| RθJA | 77.5 °C/W - Thermal resistance value used to calculate junction temperature rise above ambient under steady-state power dissipation. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference in unidirectional TVS configuration; enables clamping to GND during positive transients. |
| Cathode | Current exit point during forward conduction; marked with band | Connected to protected line (e.g., sensor supply or signal); defines polarity and clamping direction relative to system ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling - supports PPAP compliance. |
| Junction passivation | Optimized anisotropic rectifier process reduces leakage drift and improves long-term stability under thermal cycling and humidity exposure. |
| MSL Level 1 rating | Allows unlimited floor life and compatibility with standard 260 °C lead-free reflow profiles without baking preconditioning. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or ISO 7637-2 pulses), improving protection margin for sensitive ICs. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Protection of 12 V supply rail against load-dump transients up to 35 V and 100 ms duration in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive overvoltage spikes to limit stress on MCU power pins and CAN transceivers. Use Value: Withstands 3000 W surge energy and operates reliably at 185 °C junction temperature - eliminates need for external heatsinking in compact ECU modules. |
Use Scenario: Safeguarding analog input channels of motor drive controllers exposed to inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Fast-response TVS suppresses sub-microsecond voltage spikes before they reach precision ADC front-ends or op-amp buffers. Use Value: 45.4 V clamping voltage at 66.1 A ensures downstream components remain within absolute maximum ratings during worst-case switching events. |
| Automotive Sensor Signal Line | Telecom Power Supply Input |
Use Scenario: Shielding LIN bus or analog sensor outputs (e.g., pressure, temperature) from coupled noise and electrostatic discharge in vehicle cabins. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA at 28 V) unidirectional TVS provides high-impedance standby state while reacting in <1 ns to ESD events. Use Value: Maintains signal integrity across wide temperature range (-65 °C to +185 °C) without introducing offset or drift in millivolt-level sensor signals. |
Use Scenario: Front-end protection of 24 V telecom power supplies subjected to lightning-induced surges and AC line transients per IEC 61000-4-5. IC Role / Device Role / Timing Role: High-power TVS absorbs multi-kW energy pulses upstream of DC/DC converters and PMICs. Use Value: 3000 W peak pulse rating and 77.5 °C/W thermal resistance enable robust surge handling without derating in enclosed telecom chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | Same DO-214AA (SMB) package, lower 600 W PPPM, 45.4 V VC at 13.3 A IPPM | Limited to lower-energy transients; unsuitable for automotive load-dump or high-current inductive switching. | Select when space-constrained layouts require smaller SMB footprint and surge energy remains below 600 W. |
| SMCJ28A | Same DO-214AB (SMC) package, identical 3000 W PPPM, but only rated to 175 °C TJ max and not AEC-Q101 qualified. | Not approved for automotive safety-critical systems; requires additional qualification effort for automotive OEM programs. | Choose for industrial or telecom applications where AEC-Q101 is not mandated and 175 °C operation suffices. |
Compared with SMBJ28A and SMCJ28A, the 3KASMC28AHM3_A/H uniquely combines AEC-Q101 qualification, 185 °C junction rating, and full 3000 W surge capability in the SMC package - making it the only option qualified for under-hood automotive deployment without design compromise.
Availability
3KASMC28AHM3_A/H is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, sensor interface circuits, and telecom power supply inputs requiring stable component supply and long-term lifecycle assurance.
Supply support for 3KASMC28AHM3_A/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 3KASMC series belongs to Vishay's PAR® family of high-power TVS diodes engineered specifically for AEC-Q101-compliant automotive electronics requiring extended temperature operation and robust transient immunity.
FAQ
What is the clamping voltage of the 3KASMC28AHM3_A/H at its rated peak pulse current?
The 3KASMC28AHM3_A/H has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current (IPPM) of 66.1 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The 3KASMC28AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC28AHM3_A/H qualified for automotive applications?
Yes, the 3KASMC28AHM3_A/H is AEC-Q101 qualified and explicitly designed for automotive use. It meets stress test requirements including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling. Its 185 °C maximum junction temperature rating and MSL Level 1 reflow compatibility further support deployment in under-hood ECUs and body control modules where thermal and reliability demands are most stringent.
What package type does the 3KASMC28AHM3_A/H use, and what are its key mechanical features?
The 3KASMC28AHM3_A/H uses the DO-214AB (SMC) surface-mount package. Key mechanical features include matte tin-plated leads compliant with J-STD-002, UL 94 V-0 rated molding compound, cathode identification via molded band, and JESD201 Class 2 whisker resistance. The package supports standard SMT assembly and achieves 77.5 °C/W thermal resistance on recommended PCB pad layout.
How does the 3KASMC28AHM3_A/H differ from standard SMCJ28A TVS diodes?
The 3KASMC28AHM3_A/H differs from SMCJ28A in three key ways: it is AEC-Q101 qualified (SMCJ28A is not), rated for 185 °C maximum junction temperature (SMCJ28A is limited to 175 °C), and features junction passivation optimized for long-term stability under thermal cycling. These distinctions make the 3KASMC28AHM3_A/H suitable for automotive safety-critical applications where SMCJ28A would require additional qualification.
What is the reverse leakage current specification for the 3KASMC28AHM3_A/H at its stand-off voltage?
The 3KASMC28AHM3_A/H exhibits a maximum reverse leakage current (IR) of 1.0 μA at its 28 V stand-off voltage (VWM) and 25 °C ambient temperature. At elevated temperature (TJ = 150 °C), leakage remains ≤10 μA - ensuring minimal power loss and no interference with high-impedance sensor or communication lines it protects.
3KASMC28AHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
3KASMC28AHM3_A/H FAQ
1.How can I place an order for 3KASMC28AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHM3_A/H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 3KASMC28AHM3_A/H reliable?
The price and inventory of 3KASMC28AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHM3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHM3_A/H?
3KASMC28AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHM3_A/H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 3KASMC28AHM3_A/H?
For technical support, including 3KASMC28AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHM3_A/H requirements.
6.How does Aetrix verify that 3KASMC28AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHM3_A/H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 3KASMC28AHM3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHM3_A/H?
All 3KASMC28AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHM3_A/H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 3KASMC28AHM3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC28AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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