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Vishay General Semiconductor - Diodes Division 3KASMC28AHE3/57T
- Part No.:
- 3KASMC28AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHE3/57T.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,167
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Product details
Overview
3KASMC28AHE3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 45.4 V under 66.1 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients in engine control units and motor drives.
For engineers reviewing the 3KASMC28AHE3/57T datasheet, 3KASMC28AHE3/57T pinout, 3KASMC28AHE3/57T application, or 3KASMC28AHE3/57T equivalent, key selection criteria include its 28 V stand-off voltage, AEC-Q101 qualification, DO-214AB (SMC) package thermal performance, and uni-directional polarity for DC-biased rail protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under high-temperature stress (TJ = 185 °C) and meets MSL Level 1 reflow requirements (260 °C peak). Its low incremental surge resistance and fast response time ensure effective suppression of fast-rising transients induced by relay or solenoid switching.
The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine), with 6.0 W steady-state power dissipation on infinite heatsink at TL = 75 °C. Thermal resistance is 18.3 °C/W junction-to-leads, supporting reliable operation in compact, thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 24 V nominal DC rail. |
| VBR (min/max) | 31.1 V / 34.4 V at 1.0 mA - Confirmed breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 45.4 V at 66.1 A - Clamping voltage limits downstream component stress during 3000 W transient surges. |
| PPPM | 3000 W (10/1000 μs) - Sustains high-energy transients common in automotive load-dump and ISO 7637-2 pulse 5a scenarios. |
| TJ max. | 185 °C - Enables deployment in under-hood electronics without derating in high-ambient environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and matte tin-plated leads. |
Pinout & Package
Package: DO-214AB (SMC), molded epoxy case meeting UL 94 V-0 flammability rating; cathode indicated by color band; terminals are matte tin plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected circuit ground or low-side return path; enables clamping when cathode is biased above anode. |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., 24 V rail); conducts surge current to ground when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage performance (<1.0 μA at VWM) and long-term reliability at 185 °C junction temperature. |
| 3000 W peak pulse power (10/1000 μs) | Withstands severe automotive load-dump transients without degradation, per ISO 7637-2 Pulse 5a requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving clamping precision. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| Uni-directional polarity only | Optimized for DC-biased applications such as 12 V/24 V power rails where reverse conduction is not required. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Protecting microcontroller I/O and gate drivers from voltage spikes generated by fuel injector or solenoid coil de-energization. IC Role / Device Role / Timing Role: Uni-directional TVS placed between 12 V supply rail and chassis ground to clamp transients before they reach sensitive logic. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic interfaces while maintaining AEC-Q101 compliance for under-hood placement. |
Use Scenario: Safeguarding IGBT gate drivers and bootstrap circuits from cross-conduction-induced shoot-through transients. IC Role / Device Role / Timing Role: Clamping device on isolated DC bus rails to limit voltage overshoot during rapid PWM switching transitions. Use Value: Reduces risk of gate oxide breakdown in high-side drivers by limiting transient excursions to ≤45.4 V at 66.1 A. |
| Telecom Power Supply Input | Consumer Appliance Main Board |
Use Scenario: Suppressing lightning-induced surges on AC/DC adapter input lines feeding telecom base station power modules. IC Role / Device Role / Timing Role: Primary-level TVS on bulk capacitor input to absorb differential-mode transients before upstream filtering. Use Value: Maintains system uptime by preventing overvoltage shutdown of PMICs and reducing need for redundant protection stages. |
Use Scenario: Guarding microcontroller reset lines and communication buses (e.g., UART, I²C) against ESD and relay bounce in washing machine control boards. IC Role / Device Role / Timing Role: Low-capacitance clamping element on signal lines referenced to 3.3 V supply, leveraging fast response time. Use Value: Eliminates false resets and communication errors caused by 8 kV contact ESD events per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for lower-energy transients; limited to ambient temperatures ≤125 °C due to thermal constraints | Select when cost or board space is critical and surge energy does not exceed 400 W. |
| SMCJ28AHE3/57T | Same DO-214AB package, identical VWM/VC, but rated for 1500 W PPPM (10/1000 μs) | Meets industrial but not full automotive AEC-Q101 requirements; lacks high-temp TJ = 185 °C validation | Choose for non-automotive applications requiring same footprint but lower surge immunity budget. |
Compared with SMAJ28A-E3/57T and SMCJ28AHE3/57T, the 3KASMC28AHE3/57T provides 2× higher peak power handling and validated operation at 185 °C - making it the only option among the three qualified for under-hood automotive use with full ISO 7637-2 compliance.
Availability
3KASMC28AHE3/57T is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom power supplies, and consumer appliance main boards requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for 3KASMC28AHE3/57T 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, rectifiers, and protection devices for demanding industrial and automotive environments.
The 3KASMCxxA series was engineered specifically for AEC-Q101-compliant transient suppression in high-temperature automotive power systems, emphasizing thermal stability, surge robustness, and process-controlled passivation.
FAQ
What is the maximum clamping voltage of the 3KASMC28AHE3/57T under surge conditions?
The 3KASMC28AHE3/57T has a maximum clamping voltage (VC) of 45.4 V at 66.1 A peak pulse current (IPPM) using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see no more than 45.4 V during worst-case transients - critical for protecting 3.3 V or 5 V logic interfaces powered from a 24 V rail.
Is the 3KASMC28AHE3/57T qualified for automotive applications?
Yes, the 3KASMC28AHE3/57T is AEC-Q101 qualified and rated for operation up to 185 °C junction temperature. It meets automotive reliability requirements including temperature cycling, highly accelerated life testing (HALT), and ESD robustness - making it suitable for under-hood engine control units, body control modules, and ADAS power supplies.
What package type does the 3KASMC28AHE3/57T use, and what are its mounting requirements?
The 3KASMC28AHE3/57T uses the DO-214AB (SMC) surface-mount package with dimensions 7.75 mm × 6.22 mm. Mounting requires the minimum recommended pad layout per Vishay specification - including 3.20 mm minimum anode/cathode pad width and 1.52 mm minimum solder mask clearance - to ensure thermal performance and mechanical reliability during reflow.
How does the 3KASMC28AHE3/57T differ from standard SMCJ-series TVS diodes?
The 3KASMC28AHE3/57T differs from standard SMCJ28A devices by offering 3000 W peak pulse power (vs. 1500 W), AEC-Q101 qualification, and validated 185 °C junction operation. Its passivated anisotropic rectifier structure also delivers lower leakage (<1.0 μA at VWM) and improved high-temperature stability compared to conventional SMCJ designs.
Can the 3KASMC28AHE3/57T be used in bidirectional configurations?
No, the 3KASMC28AHE3/57T is unidirectional only, with polarity marked by a cathode band. It is intended for DC-biased applications like 12 V or 24 V power rails. For bidirectional protection, two devices must be connected in series opposition - but this configuration is not validated or recommended by Vishay for the 3KASMC28AHE3/57T.
3KASMC28AHE3/57T 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)
3KASMC28AHE3/57T FAQ
1.How can I place an order for 3KASMC28AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHE3/57T 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 3KASMC28AHE3/57T reliable?
The price and inventory of 3KASMC28AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHE3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHE3/57T?
3KASMC28AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHE3/57T 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 3KASMC28AHE3/57T?
For technical support, including 3KASMC28AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHE3/57T requirements.
6.How does Aetrix verify that 3KASMC28AHE3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHE3/57T 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 3KASMC28AHE3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHE3/57T?
All 3KASMC28AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHE3/57T, 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 3KASMC28AHE3/57T part is unused and in its original packaging.
Return procedure for 3KASMC28AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC28AHE3/57T Tags
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