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Vishay General Semiconductor - Diodes Division 3KASMC12AHE3/57T
- Part No.:
- 3KASMC12AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHE3/57T.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,753
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Product details
Overview
3KASMC12AHE3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 12 V stand-off voltage, 13.3–14.7 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 µs), 151 A maximum peak surge current, and 19.9 V clamping voltage at IPPM - deployed for automotive power line and sensor signal protection.
For engineers reviewing the 3KASMC12AHE3/57T datasheet, 3KASMC12AHE3/57T pinout, 3KASMC12AHE3/57T application, or 3KASMC12AHE3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, MSL Level 1 moisture sensitivity, and DO-214AB thermal performance with RθJA = 77.5 °C/W.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under high-temperature transients. Its junction design supports 185 °C maximum operating temperature and meets AEC-Q101 stress test requirements for automotive reliability.
It delivers 3000 W peak pulse power handling with low incremental surge resistance and fast response time, enabling robust suppression of inductive switching spikes and lightning-induced surges on 12 V systems without forward conduction during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum reverse working voltage before clamping begins; defines safe operating range for 12 V nominal circuits. |
| VBR min/max | 13.3 V / 14.7 V at IT = 1 mA - Confirmed breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 19.9 V - Clamping voltage at 151 A surge; limits downstream IC/MOSFET stress during transient events. |
| PPPM | 3000 W (10/1000 µs) - Sustains high-energy transients common in automotive load-dump and ISO 7637-2 pulses. |
| TJ max | 185 °C - Enables under-hood deployment where ambient temperatures exceed 125 °C. |
| Polarity | Unidirectional - Blocks reverse leakage while clamping positive transients only; requires correct cathode orientation. |
| MSL Level | Level 1 (J-STD-020) - Supports standard SMT reflow without baking; peak solder temperature up to 260 °C. |
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 JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected line (e.g., 12 V rail or signal); conducts surge current to ground when VC exceeded. |
| Cathode | Current exit terminal during clamping | Marked by color band; tied to system ground or low-impedance return path to complete clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low IR drift across temperature and lifetime. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTGB, HTRB, TCT, and ESD testing per JEDEC standards. |
| Low clamping ratio (VC/VBR) | 19.9 V / 13.3 V ≈ 1.49 - Minimizes overvoltage overshoot during fast transients compared to competing TVS devices. |
| RθJL | 18.3 °C/W - Enables efficient heat transfer from junction to PCB pads, supporting sustained surge duty in compact layouts. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power rail and ground, activated within nanoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤19.9 V during 3000 W surges, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor on differential or single-ended signal lines, grounded via shortest possible trace. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <20 V within <1 ns, preserving signal integrity and ADC accuracy. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V DC input, coordinated with upstream fuse and secondary filtering. Use Value: Absorbs 10/1000 µs surges up to 3000 W without degradation, maintaining compliance with IEC 61000-4-5 Level 4. | Use Scenario: Preventing output overvoltage damage in wall-mounted AC/DC adapters supplying USB-C PD or 12 V peripherals. IC Role / Device Role / Timing Role: Final-stage TVS on regulated DC output, placed immediately before connector to limit fault propagation. Use Value: Withstands repetitive 100 A surges (8.3 ms half-sine) without parametric shift, ensuring long-term adapter field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Lower PPPM (400 W), same DO-214AC (SMA) package, VBR = 13.3–14.7 V, VC = 19.9 V | Not AEC-Q101 qualified; limited to commercial/industrial use; lower surge margin | Select when cost sensitivity outweighs automotive qualification and surge energy requirements. |
| SMCJ12A | Same DO-214AB (SMC) package, PPPM = 1500 W, VBR = 13.3–14.7 V, VC = 19.9 V, AEC-Q101 qualified | Half the peak pulse power; suitable for lower-energy transients (e.g., IEC 61000-4-4 EFT) | Choose when system-level testing confirms 1500 W suffices and footprint compatibility is required. |
Compared with SMAJ12A and SMCJ12A, the 3KASMC12AHE3/57T provides 2× higher surge energy handling than SMCJ12A and full AEC-Q101 compliance unlike SMAJ12A - making it the only option meeting both automotive under-hood thermal and ISO 7637-2 Pulse 5a requirements in DO-214AB.
Availability
3KASMC12AHE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power input protection requiring stable component supply, AEC-Q101 assurance, and high-temperature operational continuity.
Supply support for 3KASMC12AHE3/57T 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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and optoelectronics, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC12AHE3/57T belongs to Vishay's PAR® (Protection Against Risk) TVS family, engineered specifically for robust transient suppression in harsh environments such as automotive power distribution, industrial control, and infrastructure equipment.
FAQ
What is the maximum junction temperature rating for the 3KASMC12AHE3/57T?
The 3KASMC12AHE3/57T has a maximum junction temperature (TJ) rating of +185 °C, validated per AEC-Q101 test conditions. This enables reliable operation in under-hood automotive locations and high-ambient industrial enclosures where conventional TVS diodes derate significantly. The 3KASMC12AHE3/57T maintains specified VBR and VC performance up to this limit.
Is the 3KASMC12AHE3/57T RoHS-compliant and halogen-free?
Yes, the 3KASMC12AHE3/57T is RoHS-compliant per Directive 2011/65/EU and halogen-free per JEDEC JS709A. It carries the HM3 suffix, confirming compliance with both material standards and passing JESD 201 Class 2 whisker testing. The 3KASMC12AHE3/57T is documented in Vishay's Material Category Policy as fully compliant.
What does the "HE3/57T" suffix indicate in 3KASMC12AHE3/57T?
The "HE3/57T" suffix denotes the packaging configuration: "HE3" identifies the base P/NHM3 variant (AEC-Q101 qualified, RoHS-compliant), and "57T" specifies 7-inch plastic tape-and-reel delivery with 850 units per reel. This matches Vishay's ordering code convention shown in the datasheet's Ordering Information table.
How does the clamping voltage of the 3KASMC12AHE3/57T compare to its breakdown voltage?
The 3KASMC12AHE3/57T has a VBR range of 13.3–14.7 V at 1 mA and a VC of 19.9 V at 151 A IPPM, yielding a clamping ratio of ~1.49. This tight ratio reflects low dynamic impedance and ensures minimal overvoltage overshoot during fast transients - critical for protecting 12 V-rated ICs like CAN transceivers and power management ICs.
Can the 3KASMC12AHE3/57T be used in bidirectional configurations?
No, the 3KASMC12AHE3/57T is unidirectional only, as explicitly stated in the Vishay datasheet. It clamps positive transients relative to ground and blocks reverse current. For bidirectional protection, two 3KASMC12AHE3/57T devices must be connected in series opposition - but that configuration is not validated or recommended by Vishay for this part number.
3KASMC12AHE3/57T 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 151A
- 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)
3KASMC12AHE3/57T FAQ
1.How can I place an order for 3KASMC12AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHE3/57T 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 3KASMC12AHE3/57T reliable?
The price and inventory of 3KASMC12AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC12AHE3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHE3/57T?
3KASMC12AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHE3/57T 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 3KASMC12AHE3/57T?
For technical support, including 3KASMC12AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHE3/57T requirements.
6.How does Aetrix verify that 3KASMC12AHE3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHE3/57T 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 3KASMC12AHE3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHE3/57T?
All 3KASMC12AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHE3/57T, 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 3KASMC12AHE3/57T part is unused and in its original packaging.
Return procedure for 3KASMC12AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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