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Vishay General Semiconductor - Diodes Division 3KASMC28AHE3_A/I
- Part No.:
- 3KASMC28AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHE3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,652
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Product details
Overview
3KASMC28AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount 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), 185 °C max junction temperature, and AEC-Q101 qualified for automotive power line protection.
For engineers reviewing the 3KASMC28AHE3_A/I datasheet, 3KASMC28AHE3_A/I pinout, 3KASMC28AHE3_A/I application, or 3KASMC28AHE3_A/I equivalent, this page delivers verified electrical specs, thermal behavior, clamping performance, packaging details, and validated alternatives for high-reliability transient suppression in automotive ECUs and industrial power rails.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress, with low incremental surge resistance and fast response time enabling effective protection of downstream MOSFETs and ICs against inductive switching transients. Its 185 °C junction rating supports operation in engine bay and under-hood environments without derating penalties up to 150 °C ambient.
The device operates exclusively in unidirectional mode, with cathode denoted by a color band, and meets MSL Level 1 per J-STD-020 (260 °C peak reflow). Thermal resistance is 77.5 °C/W junction-to-ambient (typ.) and 18.3 °C/W junction-to-leads, supporting robust power dissipation on standard PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum reverse working voltage before clamping begins; defines safe operating margin for 24 V automotive systems. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 45.4 V - Clamping voltage at 66.1 A peak pulse current; limits voltage seen by protected circuitry during 3000 W transient. |
| PPPM | 3000 W - Peak pulse power handling capability with 10/1000 μs waveform; suitable for ISO 7637-2 Pulse 1/2a/5a compliance testing. |
| TJ max | 185 °C - Enables continuous operation in high-temperature automotive zones without thermal shutdown or parameter drift. |
| IFSM | 200 A - Surge current rating for 8.3 ms half-sine wave; supports protection against load dump and alternator transients. |
| RθJA | 77.5 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs board-level thermal design for sustained power dissipation. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, AEC-Q101 qualified, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground or low-side return path. | Provides low-impedance path to ground during reverse transient clamping; must be routed with minimal inductance. |
| Cathode | Current exit terminal in forward bias; marked with color band; connected to protected line (e.g., 24 V rail). | Defines polarity-sensitive connection point; reverse-biased during normal operation; conducts only during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure improves long-term reliability under thermal cycling and humidity exposure. |
| AEC-Q101 qualification | Validated for automotive-grade stress tests including HTGB, HTRB, and temperature cycling - required for ECU front-end protection. |
| 3000 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) up to 40 V superimposed on 24 V system without failure. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during clamping, reducing stress on downstream 30 V-rated MOSFETs and gate drivers. |
| MSL Level 1 rating | Enables standard SMT reflow without moisture sensitivity concerns - no baking required prior to assembly. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC-DC input stage to clamp transients before they reach regulator ICs. Use Value: Limits clamped voltage to 45.4 V at 66.1 A, ensuring downstream 40 V-input buck converters remain within absolute maximum ratings. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff protection element on 24 V sensor interface lines, absorbing energy from relay coil flyback and ESD events. Use Value: Fast response time and 3000 W pulse rating prevent latch-up or damage to optocouplers and level-shifting buffers. |
| Motor Drive Gate Driver Protection | Telecom Power Supply Surge Suppression |
|
Use Scenario: Shielding high-side and low-side gate drivers in BLDC motor inverters from shoot-through-induced voltage spikes. IC Role / Device Role / Timing Role: Localized TVS across driver supply pins (VDD-GND) to suppress sub-100 ns transients generated by fast SiC/MOSFET switching. Use Value: 185 °C junction rating allows placement near heat-generating power stages without derating; 77.5 °C/W RθJA enables compact layout. |
Use Scenario: Front-end protection of 48 V telecom rectifiers subjected to lightning-induced surges on AC mains and DC distribution lines. IC Role / Device Role / Timing Role: Primary clamping device in multi-stage surge protection architecture, absorbing bulk energy before MOV and GDT secondary stages. Use Value: 200 A IFSM rating handles 8.3 ms half-sine surges per IEC 61000-4-5; unidirectional polarity avoids leakage issues in DC-fed systems. |
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 PPPM (600 W); higher VC/VBR ratio (1.45); 150 °C TJ max. | Limited to lower-energy transients (e.g., IEC 61000-4-4); not AEC-Q101 qualified; unsuitable for under-hood use. | Select when cost sensitivity outweighs automotive qualification and 3000 W requirement. |
| SMCJ28A | Same DO-214AB (SMC) package; identical VWM/VBR; same 3000 W rating; but only 175 °C TJ max and no AEC-Q101 certification. | Acceptable for industrial environments below 150 °C ambient; lacks automotive validation for production ECUs. | Choose if AEC-Q101 is not mandated and thermal margin above 175 °C is unnecessary. |
Compared with SMBJ28A and SMCJ28A, the 3KASMC28AHE3_A/I delivers superior high-temperature resilience (185 °C), formal AEC-Q101 qualification, and tighter clamping performance - making it the only option qualified for safety-critical automotive power rail protection where thermal and reliability margins are non-negotiable.
Availability
3KASMC28AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, motor drive gate driver circuits, and telecom power supply designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KASMC28AHE3_A/I 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, and passive components for automotive, industrial, and computing markets.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing high-temperature stability, repeatable clamping, and robust surge endurance under real-world load-dump conditions.
FAQ
What is the clamping voltage of the 3KASMC28AHE3_A/I at its rated peak pulse current?
The 3KASMC28AHE3_A/I has a maximum clamping voltage (VC) of 45.4 V at its peak pulse current (IPPM) of 66.1 A, measured with a 10/1000 μs waveform. This value is confirmed in the Electrical Characteristics table on page 2 of Vishay document 89962. The 3KASMC28AHE3_A/I maintains this clamping performance across its full operating temperature range up to 150 °C ambient, ensuring predictable protection behavior in automotive applications.
Is the 3KASMC28AHE3_A/I suitable for bidirectional transient protection?
No, the 3KASMC28AHE3_A/I is strictly unidirectional, as explicitly stated in the Features section of the Vishay datasheet. It contains a single PN junction configured for reverse-biased clamping only. For bidirectional protection, a different device such as the 3KASMC28CA (center-tapped, bidirectional variant) would be required. The 3KASMC28AHE3_A/I's cathode band marking and unidirectional polarity designation confirm this limitation.
What does the "_A/I" suffix mean in 3KASMC28AHE3_A/I?
The "_A/I" suffix in 3KASMC28AHE3_A/I indicates the packaging configuration: "A" denotes the base P/NHM3 revision (RoHS-compliant and AEC-Q101 qualified), and "I" specifies the delivery mode as 13-inch diameter plastic tape and reel with a base quantity of 3500 units. This ordering code is defined in the Ordering Information table on page 2 of Vishay document 89962, and applies directly to the 3KASMC28AHE3_A/I part number.
Does the 3KASMC28AHE3_A/I require special PCB layout considerations?
Yes - the 3KASMC28AHE3_A/I requires adherence to the minimum recommended pad layout shown in the Package Outline Dimensions diagram (page 4 of Vishay document 89962), including 0.126" (3.20 mm) minimum pad width and 0.185" (4.69 mm) maximum pad length. Deviating from this layout increases thermal resistance and reduces surge current handling; the specified RθJA of 77.5 °C/W assumes compliance with these dimensions.
How does the 3KASMC28AHE3_A/I perform under high-temperature operating conditions?
The 3KASMC28AHE3_A/I is rated for continuous operation up to 185 °C junction temperature and exhibits stable VBR and VC characteristics across -65 °C to +185 °C. Derating curves in Figure 2 of Vishay document 89962 show that at 150 °C ambient, it retains >80% of its 3000 W peak pulse power capability. This makes the 3KASMC28AHE3_A/I uniquely suited for under-hood automotive applications where other TVS diodes degrade significantly.
3KASMC28AHE3_A/I 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_A/I FAQ
1.How can I place an order for 3KASMC28AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHE3_A/I 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_A/I reliable?
The price and inventory of 3KASMC28AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHE3_A/I?
3KASMC28AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHE3_A/I 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_A/I?
For technical support, including 3KASMC28AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHE3_A/I requirements.
6.How does Aetrix verify that 3KASMC28AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHE3_A/I?
All 3KASMC28AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for 3KASMC28AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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