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Vishay General Semiconductor - Diodes Division 3KASMC11HE3/9AT
- Part No.:
- 3KASMC11HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC11HE3/9AT.pdf
- Description:
- TVS DIODE 11VWM 20.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,938
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Product details
Overview
3KASMC11HE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 11 V stand-off voltage, 12.2–13.5 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 μs), 185 °C maximum junction temperature, and AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the 3KASMC11HE3/9AT datasheet, 3KASMC11HE3/9AT pinout, 3KASMC11HE3/9AT application, or 3KASMC11HE3/9AT equivalent, this page delivers verified electrical specs, clamping behavior under surge, thermal resistance (RθJA = 77.5 °C/W), polarity marking, and AEC-Q101 qualification status - all critical for ESD/surge protection design in high-reliability systems.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to achieve stable clamping performance across -65 °C to +185 °C operating range. Its unidirectional configuration provides forward conduction path during overvoltage events while maintaining low leakage (<5 μA at 11 V) and fast response time for transient suppression.
The device delivers 165 A peak pulse current (IPPM) with 18.2 V maximum clamping voltage at IPPM, enabling robust protection of downstream ICs and MOSFETs against inductive switching transients and lightning-induced surges in automotive and industrial signal lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum reverse stand-off voltage before significant leakage; defines safe operating margin below breakdown. |
| VBR (min/max) | 12.2 V / 13.5 V at 1 mA - Confirmed breakdown threshold ensuring predictable turn-on during transients. |
| PPPM | 3000 W (10/1000 μs) - Peak surge energy handling capacity for automotive-level ISO 7637-2 and IEC 61000-4-5 compliance. |
| IPPM | 165 A - Peak surge current capability directly supporting protection of 12 V automotive power rails and sensor interfaces. |
| VC @ IPPM | 18.2 V - Clamping voltage limiting stress on protected circuitry; ensures MOSFET gate or MCU I/O stays within safe voltage range. |
| TJ max. | +185 °C - Enables operation in under-hood automotive environments without derating penalties up to ambient 125 °C. |
| RθJA | 77.5 °C/W - Thermal resistance defining junction-to-ambient temperature rise under continuous power dissipation (6.0 W). |
Pinout & Package
Package: DO-214AB (SMC) - Surface-mount plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, MSL Level 1, and cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to protected line's lower-potential side (e.g., ground or return path) in unidirectional TVS configuration. |
| Cathode | Reverse-biased clamping terminal | Marked with color band; connected to protected line (e.g., 12 V rail or signal line) to clamp positive transients to VC. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable leakage and breakdown voltage over lifetime and temperature. |
| AEC-Q101 qualification | Validated reliability for automotive applications including temperature cycling, humidity bias, and mechanical shock testing. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 16750-2 load dump spikes), improving clamping fidelity. |
| MSL Level 1 rating | Enables standard reflow soldering at peak 260 °C without moisture-induced damage or popcorn effect. |
| Uni-directional polarity only | Simplifies layout and reduces risk of misapplication in DC-biased circuits where negative transients are not expected. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load dump transients (up to 120 V, 400 ms) on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp overvoltage before LDO or MCU power supply. Use Value: Limits peak voltage to ≤18.2 V at 165 A surge, preventing damage to 20 V-rated input stages and meeting ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) from ESD and inductive kickback in factory automation sensors. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt transients before signal conditioning amplifier or ADC driver. Use Value: Clamps 3000 W surges within nanoseconds while maintaining <5 μA leakage at 11 V, preserving signal integrity and offset accuracy. |
| Automotive CAN Transceiver Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding CANH/CANL pins of automotive-grade transceivers (e.g., TJA1042) against ESD and bus faults. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on each differential line, referenced to common ground, leveraging low capacitance and fast response. Use Value: Provides 18.2 V clamping with minimal impact on CAN signal edge rate due to low junction capacitance (typ. <100 pF at 0 V). |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters after rectification, protecting primary-side controller feedback paths. IC Role / Device Role / Timing Role: TVS placed across bulk capacitor to absorb residual surges escaping primary-side MOV and Y-cap filtering. Use Value: Handles repetitive 3000 W pulses without degradation, extending capacitor life and meeting UL 1449 Type 2 secondary surge protection requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Lower peak pulse power (400 W), smaller SMA package (DO-214AC), RθJA = 110 °C/W, same VWM/VBR range. | Suitable for consumer-grade, non-automotive designs with lower surge exposure and tighter board space. | Select SMAJ11A only when 3000 W rating is unnecessary and thermal budget allows higher junction temperature rise. |
| 1.5KE11A | Through-hole TO-204AA (DO-41) package, 1500 W rating, higher VF (3.5 V), no AEC-Q101 qualification. | Applicable in legacy industrial power supplies where board real estate and manual assembly are acceptable. | Choose 1.5KE11A if surface-mount constraints are absent and automotive qualification is not required. |
Compared with SMAJ11A and 1.5KE11A, the 3KASMC11HE3/9AT delivers 7.5× higher surge power in a surface-mount package with automotive-grade reliability and thermal performance - making it the preferred choice for modern automotive and high-reliability industrial designs requiring sustained 185 °C operation.
Availability
3KASMC11HE3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, CAN bus nodes, and power adapter secondary-side protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KASMC11HE3/9AT 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, automotive-qualified components.
The 3KASMC series was designed specifically for high-temperature, high-surge automotive and industrial applications - delivering AEC-Q101 qualified transient protection with 185 °C junction capability and 3000 W pulse power in compact SMC packaging.
FAQ
What is the clamping voltage of the 3KASMC11HE3/9AT at its rated peak pulse current?
The 3KASMC11HE3/9AT has a maximum clamping voltage (VC) of 18.2 V when subjected to its rated peak pulse current of 165 A (10/1000 μs waveform). This value is measured per JEDEC test conditions and ensures protected circuits remain within safe voltage limits during surge events. The 3KASMC11HE3/9AT maintains this clamping performance across its full operating temperature range up to +185 °C.
Is the 3KASMC11HE3/9AT qualified for automotive applications?
Yes, the 3KASMC11HE3/9AT is AEC-Q101 qualified, having passed rigorous stress tests including temperature cycling, high-temperature operating life, and mechanical shock - confirming suitability for automotive powertrain, body electronics, and ADAS systems. The 3KASMC11HE3/9AT also supports operation up to +185 °C junction temperature, exceeding standard automotive requirements.
What package type does the 3KASMC11HE3/9AT use, and what are its key mechanical features?
The 3KASMC11HE3/9AT uses the DO-214AB (SMC) surface-mount package: 7.11 mm × 6.22 mm body, matte tin-plated leads, UL 94 V-0 flammability rating, and MSL Level 1 moisture sensitivity. The cathode is marked by a color band, and the device is optimized for reflow soldering at 260 °C peak. The 3KASMC11HE3/9AT's thermal resistance is RθJA = 77.5 °C/W on standard PCB pad layout.
How does the 3KASMC11HE3/9AT differ from bidirectional TVS diodes?
The 3KASMC11HE3/9AT is unidirectional only, meaning it conducts in forward bias and clamps positive transients to ground - ideal for DC-biased lines like automotive 12 V rails or sensor outputs. Unlike bidirectional TVS diodes, it does not suppress negative-going transients. This design yields lower leakage (<5 μA at 11 V) and better clamping consistency for single-polarity surge threats. The 3KASMC11HE3/9AT is not interchangeable with bidirectional variants without circuit redesign.
What is the maximum reverse leakage current of the 3KASMC11HE3/9AT at its stand-off voltage?
The 3KASMC11HE3/9AT exhibits a maximum reverse leakage current (IR) of 5.0 μA at its 11 V stand-off voltage (VWM) and 25 °C ambient temperature. At elevated temperature (TJ = 150 °C), leakage remains ≤50 μA - a critical parameter for low-power sensor interfaces and battery-backed systems where standby current must be minimized. This leakage performance is guaranteed per the 3KASMC11HE3/9AT datasheet revision 05-Mar-13.
3KASMC11HE3/9AT 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 20.1V
- Current - Peak Pulse (10/1000µs):
- 149A
- 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)
3KASMC11HE3/9AT FAQ
1.How can I place an order for 3KASMC11HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC11HE3/9AT 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 3KASMC11HE3/9AT reliable?
The price and inventory of 3KASMC11HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC11HE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC11HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC11HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC11HE3/9AT?
3KASMC11HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC11HE3/9AT 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 3KASMC11HE3/9AT?
For technical support, including 3KASMC11HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC11HE3/9AT requirements.
6.How does Aetrix verify that 3KASMC11HE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC11HE3/9AT 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 3KASMC11HE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC11HE3/9AT?
All 3KASMC11HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC11HE3/9AT, 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 3KASMC11HE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC11HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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