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Vishay General Semiconductor - Diodes Division 3KASMC12HE3_A/H
- Part No.:
- 3KASMC12HE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12HE3_A/H.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,840
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Product details
Overview
3KASMC12HE3_A/H 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), 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR), and 19.9 V clamping voltage (VC) at 151 A IPPM. It operates from −65 °C to +185 °C and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the 3KASMC12HE3_A/H datasheet, 3KASMC12HE3_A/H pinout, 3KASMC12HE3_A/H application, or 3KASMC12HE3_A/H equivalent, this device serves as a high-reliability, high-temperature clamping solution for inductive load switching transients on power rails and signal lines in automotive ECUs, industrial sensors, and telecom interface circuits.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for stable clamping under high-temperature stress. Its 185 °C maximum junction temperature and MSL Level 1 rating support reflow compatibility up to 260 °C peak.
It delivers low incremental surge resistance and fast response time to limit voltage overshoot during ESD and lightning-induced surges. The unidirectional polarity and DO-214AB package enable compact placement near IC inputs or MOSFET gate drivers without polarity ambiguity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below system rail voltage. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown threshold range ensures predictable turn-on across production lots. |
| VC @ IPPM | 19.9 V at 151 A - Clamping voltage under full 3000 W surge defines worst-case overvoltage seen by protected circuitry. |
| PPPM | 3000 W (10/1000 μs) - Peak surge power handling capability validated per ANSI/IEEE C62.35 waveform standards. |
| TJ max. | +185 °C - Enables operation in under-hood automotive environments and high-power industrial enclosures without derating. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive-grade reliability including HTGB, HTRB, and TCT. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and matte tin-plated leads. |
Pinout & Package
DO-214AB (SMC) package with cathode indicated by color band; two-terminal device with anode and cathode leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration. |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to protected line (e.g., 12 V rail or signal input); clamps to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process improves long-term stability under thermal cycling and humidity exposure. |
| High-temperature operation | Rated for continuous operation up to TJ = +185 °C, enabling use in engine control modules and power inverters. |
| Clamping performance | Low VC/VBR ratio (1.41) ensures tight voltage limiting with minimal overshoot during fast transients. |
| Surge robustness | 200 A IFSM (8.3 ms half-sine) supports repeated inductive switching events without degradation. |
| Manufacturing compliance | Meets MSL Level 1, JESD 201 Class 2 whisker test, and RoHS-compliant material categorization. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤19.9 V during 3000 W surges, preventing damage to downstream regulators and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response voltage clamp connected between signal line and ground reference. Use Value: Sub-1 ns response time and 19.9 V clamping ensure sensor accuracy remains intact during ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom Interface Surge Suppression | Consumer Power Adapter Input Protection |
|
Use Scenario: Safeguarding RS-485 transceiver bus lines in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used in split-rail configuration with series impedance. Use Value: 3000 W peak power rating handles 10/1000 μs induced surges while maintaining <1 μA leakage at 12 V operating voltage. |
Use Scenario: Adding secondary overvoltage protection on primary-side rectified DC output of AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed after bulk capacitor to absorb residual switching spikes. Use Value: 12 V VWM aligns with typical 13.5 V nominal DC bus, allowing reliable conduction only during fault conditions above 13.3 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Lower PPPM (400 W), same DO-214AC (SMA) package, 12 V VWM, 13.3–14.7 V VBR, but 23.2 V VC at 17.3 A. | Not suitable for automotive load dump; limited to low-energy ESD and signal-line protection. | Select SMAJ12A only for cost-sensitive consumer applications where 3000 W surge immunity is unnecessary. |
| SMCJ12A | Same DO-214AB (SMC) package, identical 12 V VWM and 13.3–14.7 V VBR, but 20.1 V VC at 149 A and 3000 W rating. | Functionally interchangeable in most layouts; slightly tighter clamping and same thermal envelope. | SMCJ12A offers marginally better clamping (20.1 V vs. 19.9 V) and broader distributor availability, but lacks explicit AEC-Q101 documentation in latest revision. |
Compared with SMAJ12A and SMCJ12A, the 3KASMC12HE3_A/H provides verified AEC-Q101 qualification and 185 °C junction rating-critical for under-hood deployment-while maintaining identical electrical clamping performance and PCB footprint compatibility with SMCJ12A.
Availability
3KASMC12HE3_A/H is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface design, and telecom infrastructure requiring stable component supply with guaranteed long-term manufacturability and automotive-grade traceability.
Supply support for 3KASMC12HE3_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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on high-reliability and automotive-qualified components.
The 3KASMC series was developed specifically for high-temperature, high-surge automotive and industrial applications demanding AEC-Q101 compliance, extended junction temperature operation, and robust transient immunity in compact SMC packages.
FAQ
What is the clamping voltage of the 3KASMC12HE3_A/H under maximum surge current?
The 3KASMC12HE3_A/H has a maximum clamping voltage (VC) of 19.9 V at 151 A peak pulse current (IPPM), measured using a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during a full-rated 3000 W transient event. The 3KASMC12HE3_A/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC12HE3_A/H suitable for automotive under-hood applications?
Yes, the 3KASMC12HE3_A/H is explicitly AEC-Q101 qualified and rated for a maximum junction temperature of +185 °C, making it suitable for under-hood automotive applications such as engine control units, transmission control modules, and body electronics exposed to elevated ambient temperatures. Its DO-214AB package and thermal resistance (RθJA = 77.5 °C/W) support reliable operation without additional heatsinking in typical mounting conditions.
What does the "_A/H" suffix mean in 3KASMC12HE3_A/H?
The "_A/H" suffix in 3KASMC12HE3_A/H indicates the packaging configuration: "H" denotes 7-inch diameter plastic tape and reel with a base quantity of 850 units, per Vishay's ordering information table. The "A" denotes the revision level of the HM3 base part, confirming RoHS compliance and AEC-Q101 qualification. This suffix does not affect electrical or thermal specifications of the 3KASMC12HE3_A/H device itself.
How does the 3KASMC12HE3_A/H compare to standard SMAJ-series TVS diodes?
The 3KASMC12HE3_A/H delivers 3000 W peak pulse power-7.5× higher than the 400 W rating of SMAJ12A-while sharing the same 12 V VWM and comparable VBR range. Its DO-214AB (SMC) package offers greater thermal mass and surge-handling capability than the smaller DO-214AC (SMA) used by SMAJ devices. The 3KASMC12HE3_A/H also features higher temperature endurance (+185 °C vs. +150 °C) and formal AEC-Q101 qualification not present in standard SMAJ variants.
Does the 3KASMC12HE3_A/H require special PCB layout considerations?
Yes-the 3KASMC12HE3_A/H should be mounted using the minimum recommended pad layout specified in the Vishay datasheet (Document Number 89962), with copper area sufficient to support thermal dissipation during repetitive surges. Short, low-inductance traces to the protected node and ground plane are critical to preserve sub-nanosecond response time. The cathode band must be correctly oriented toward the line being protected, and no thermal relief should be applied to either pad to maintain surge current path integrity.
3KASMC12HE3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 136A
- 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)
3KASMC12HE3_A/H FAQ
1.How can I place an order for 3KASMC12HE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12HE3_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 3KASMC12HE3_A/H reliable?
The price and inventory of 3KASMC12HE3_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 3KASMC12HE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC12HE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12HE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12HE3_A/H?
3KASMC12HE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12HE3_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 3KASMC12HE3_A/H?
For technical support, including 3KASMC12HE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12HE3_A/H requirements.
6.How does Aetrix verify that 3KASMC12HE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC12HE3_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 3KASMC12HE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC12HE3_A/H?
All 3KASMC12HE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12HE3_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 3KASMC12HE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC12HE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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