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Vishay General Semiconductor - Diodes Division 3KASMC28HE3_A/I
- Part No.:
- 3KASMC28HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28HE3_A/I.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,586
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Product details
Overview
3KASMC28HE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 μs), 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), and 185 °C maximum junction temperature - deployed for automotive power line and sensor signal line surge protection.
For engineers reviewing the 3KASMC28HE3_A/I datasheet, 3KASMC28HE3_A/I pinout, 3KASMC28HE3_A/I application, or 3KASMC28HE3_A/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 77.5 °C/W), clamping performance (VC = 45.4 V at IPPM), and DO-214AB mechanical layout for PCB design and reliability validation.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under high-temperature operation up to TJ = 185 °C and meets AEC-Q101 stress test requirements for automotive use. Its unidirectional polarity and low incremental surge resistance enable fast response (<1 ns) to transients induced by inductive load switching.
The device is characterized with 10/1000 μs waveform testing per ANSI/IEEE C62.35, exhibits 1.0 mA test current (IT), and maintains ≤1.0 μA reverse leakage at VWM (28 V) and ≤10 μA at TJ = 150 °C - ensuring minimal standby power loss in always-on automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V automotive systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1.0 mA - Confirmed breakdown threshold ensures reliable turn-on during overvoltage events without premature conduction. |
| PPPM | 3000 W (10/1000 μs) - Sustains high-energy surges common in load-dump and ISO 7637-2 Pulse 5a scenarios. |
| VC @ IPPM | 45.4 V - Clamped voltage during peak surge; limits downstream IC stress below 50 V in 24 V rail protection. |
| TJ max. | +185 °C - Enables placement near hot components (e.g., power MOSFETs, engine control units) without derating. |
| RθJA | 77.5 °C/W - Thermal resistance informs heatsink-free operation on standard FR-4 with recommended pad layout. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTRB, HTGB, and temperature cycling per JESD22-A108. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / cathode-referenced surge path | Connected to protected line (e.g., CAN_H, LIN, 24 V supply); conducts during positive transients in unidirectional configuration. |
| Cathode | Clamping reference / ground return | Connected to system ground or low-impedance return plane; establishes clamping voltage relative to GND during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR and low leakage across -65 °C to +185 °C. |
| High-temperature capability | TJ max = 185 °C enables direct mounting on ECU boards near power stages without thermal derating. |
| Low clamping ratio | VC/VBR ≈ 1.36 (45.4 V / 33.3 V avg) minimizes voltage overshoot during 3000 W surges. |
| Fast response time | <1 ns turn-on ensures suppression before sensitive logic or analog circuitry is damaged. |
| MSL Level 1 compliance | Supports standard SMT reflow profiles up to 260 °C peak without moisture-induced failure. |
Applications
| Automotive Power Line Protection | Engine Control Unit (ECU) Sensor Interface |
|---|---|
Use Scenario: Protecting 24 V battery-fed microcontroller power rails against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between VIN and GND to limit voltage excursion to ≤45.4 V during 3000 W surges. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V LDOs and MCU I/Os by maintaining rail integrity under harsh automotive conditions. |
Use Scenario: Safeguarding analog inputs of pressure, temperature, and position sensors connected to ECU via long harnesses. IC Role / Device Role / Timing Role: TVS diode installed at connector entry point to shunt ESD (IEC 61000-4-2) and coupled noise from adjacent wires. Use Value: Maintains signal fidelity and prevents false triggering in closed-loop engine management by limiting transients to sub-50 V levels. |
| Industrial Motor Drive Feedback Lines | Telecom Power Supply Input Stage |
Use Scenario: Shielding encoder and Hall-effect feedback signals in variable-frequency drives exposed to commutation spikes. IC Role / Device Role / Timing Role: Unidirectional TVS on differential pair lines (e.g., RS-422) to absorb inductive kickback without affecting DC bias. Use Value: Eliminates intermittent communication errors caused by >1 kV transients while preserving signal rise/fall times due to low capacitance. |
Use Scenario: Front-end protection of AC/DC and DC/DC converters in telecom base stations subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on 48 V input bus to meet IEC 61000-4-5 Level 4 (4 kV/2 kA) requirements. Use Value: Absorbs multi-kW energy pulses without degradation, supporting >100,000 surge cycles per AEC-Q101 lifetime validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Same DO-214AC (SMA) package; lower PPPM (400 W); VBR = 31.1–34.4 V; RθJA = 110 °C/W | Limited to low-energy transients (e.g., ESD only); unsuitable for load dump or ISO 7637-2 Pulse 5a | Select when cost sensitivity outweighs surge robustness and board space allows larger thermal pads for SMA. |
| SMCJ28A | Same DO-214AB (SMC) package; identical PPPM (3000 W); VBR = 31.1–34.4 V; TJ max = 175 °C; not AEC-Q101 qualified | Valid for industrial use but lacks automotive qualification evidence; requires additional reliability validation for vehicle programs | Choose for non-automotive 24 V systems where AEC-Q101 is not mandated and full 185 °C operation is unnecessary. |
Compared with SMAJ28A and SMCJ28A, the 3KASMC28HE3_A/I uniquely combines AEC-Q101 qualification, 185 °C junction rating, and DO-214AB packaging - making it the only option validated for under-hood automotive deployment without thermal or reliability compromise.
Availability
3KASMC28HE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial motor controls, and telecom power systems requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101-compliant sourcing.
Supply support for 3KASMC28HE3_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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on high-reliability and automotive-grade solutions.
The 3KASMC series is part of Vishay's PAR® (Protective Anisotropic Rectifier) platform, engineered specifically for high-energy transient suppression in demanding automotive and industrial environments where thermal stability and AEC-Q101 compliance are mandatory.
FAQ
What is the exact breakdown voltage range for 3KASMC28HE3_A/I?
The 3KASMC28HE3_A/I has a guaranteed breakdown voltage (VBR) range of 31.1 V to 34.4 V at IT = 1.0 mA, measured per ANSI/IEEE C62.35 standards. This range ensures consistent clamping behavior across production lots and supports design margining for 24 V automotive systems where nominal rail voltage can reach 28 V during charging.
Is 3KASMC28HE3_A/I qualified to AEC-Q101, and what tests does that include?
Yes, 3KASMC28HE3_A/I is fully AEC-Q101 qualified. Certification covers stress tests including High-Temperature Reverse Bias (HTRB), High-Temperature Gate Bias (HTGB), Temperature Cycling (TC), and Highly Accelerated Stress Test (HAST), all performed per JESD22-A108 and AEC-Q101-004 specifications - confirming suitability for automotive under-hood applications.
What is the maximum clamping voltage of 3KASMC28HE3_A/I during a 3000 W surge?
The 3KASMC28HE3_A/I clamps to a maximum of 45.4 V when subjected to its rated 3000 W peak pulse power (10/1000 μs waveform). This VC value is measured at the specified IPPM current and guarantees downstream circuit protection within safe voltage thresholds for 3.3 V and 5 V logic interfaces.
Does 3KASMC28HE3_A/I have unidirectional or bidirectional polarity?
The 3KASMC28HE3_A/I is a unidirectional TVS diode, indicated by the cathode band marking on the DO-214AB (SMC) package. It conducts only during positive voltage excursions relative to cathode, making it ideal for DC power rail and signal line protection where polarity is fixed and reverse conduction must be avoided.
What is the thermal resistance and how does it affect PCB layout for 3KASMC28HE3_A/I?
The 3KASMC28HE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout per Vishay document 89962. To maintain TJ ≤ 185 °C, designers must follow the specified copper pad dimensions (0.126" × 0.185") and avoid excessive thermal isolation - no additional heatsink is required under standard airflow conditions.
3KASMC28HE3_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:
- 50V
- Current - Peak Pulse (10/1000µs):
- 60A
- 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)
3KASMC28HE3_A/I FAQ
1.How can I place an order for 3KASMC28HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28HE3_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 3KASMC28HE3_A/I reliable?
The price and inventory of 3KASMC28HE3_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 3KASMC28HE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC28HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28HE3_A/I?
3KASMC28HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28HE3_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 3KASMC28HE3_A/I?
For technical support, including 3KASMC28HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28HE3_A/I requirements.
6.How does Aetrix verify that 3KASMC28HE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC28HE3_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 3KASMC28HE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC28HE3_A/I?
All 3KASMC28HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28HE3_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 3KASMC28HE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC28HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC28HE3_A/I Tags
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