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Vishay General Semiconductor - Diodes Division 3KASMC12AHE3/9AT
- Part No.:
- 3KASMC12AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHE3/9AT.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,194
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Product details
Overview
3KASMC12AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), 151 A peak surge current (IPPM), and 19.9 V clamping voltage (VC) - deployed for automotive sensor line protection against inductive switching transients.
For engineers reviewing the 3KASMC12AHE3/9AT datasheet, 3KASMC12AHE3/9AT pinout, 3KASMC12AHE3/9AT application, or 3KASMC12AHE3/9AT equivalent, key selection criteria include its AEC-Q101 qualification, TJ = 185 °C junction rating, MSL Level 1 moisture sensitivity, and uni-directional polarity with cathode band marking - critical for high-reliability automotive and industrial power rail protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge stress at elevated temperatures. Its 18.3 °C/W junction-to-lead thermal resistance and 77.5 °C/W junction-to-ambient rating support robust thermal performance on standard PCB layouts without heatsinking.
The device operates exclusively in uni-directional mode, with forward conduction only during overvoltage events exceeding VBR. It meets ANSI/IEEE C62.35 surge waveform standards and is characterized for 8.3 ms half-sine and 10/1000 μs pulse conditions per JEDEC test methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal/power rail margin. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - precise breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 19.9 V at 151 A - clamping voltage limits downstream IC/MOSFET stress during 3000 W surges. |
| PPPM | 3000 W (10/1000 μs) - enables suppression of high-energy automotive load-dump and ISO 7637-2 pulses. |
| TJ max | 185 °C - supports operation in under-hood automotive environments and high-temperature industrial enclosures. |
| IFSM | 200 A (8.3 ms half-sine) - withstands repeated inrush or fault currents without degradation. |
| Polarity | Uni-directional - blocks reverse leakage below VWM; conducts only during positive overvoltage events. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, MSL Level 1 (260 °C peak reflow), cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal during clamping | Connected to protected line (e.g., sensor VCC or signal); must be routed with low-inductance trace. |
| Cathode | Clamping output terminal | Connected to ground reference; cathode band identifies this terminal visually and on silkscreen. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage (<2 μA at VWM) and long-term reliability under thermal cycling and humidity. |
| AEC-Q101 qualification | Validated for automotive-grade production use including temperature cycling, HTRB, and ESD testing. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 16750-2 pulse 5a). |
| Very fast response time | Sub-nanosecond turn-on ensures clamping occurs before sensitive ICs experience overstress. |
| UL 94 V-0 molding compound | Provides flame-retardant encapsulation required for automotive and industrial safety compliance. |
Applications
| Automotive Sensor Protection | Industrial Power Rail Clamping |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from inductive kickback in engine control units. IC Role / Device Role / Timing Role: Uni-directional TVS clamp placed between signal line and chassis ground to limit transient voltage to <20 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V interface ICs during 100 V/500 ms load dump events. |
Use Scenario: Safeguarding 12 V DC input rails of PLC I/O modules exposed to relay coil switching noise. IC Role / Device Role / Timing Role: Primary surge suppressor across input terminals, absorbing up to 3000 W for 1000 μs. Use Value: Eliminates need for secondary RC snubbers while maintaining <19.9 V clamping under full-rated surge. |
| Consumer Power Adapter Input | Telecom Line Interface Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home hubs after rectification. IC Role / Device Role / Timing Role: Standoff-rated TVS across 12 V output to absorb flyback spikes from transformer leakage inductance. Use Value: Maintains output regulation integrity during 150 V/1000 μs surges without derating adjacent capacitors. |
Use Scenario: Protecting Ethernet PHY power pins (e.g., 3.3 V bias rails) from ESD and lightning-induced surges on PoE-powered devices. IC Role / Device Role / Timing Role: Fast-clamping uni-directional suppressor tied between supply and ground near connector entry point. Use Value: Achieves <20 V clamping within 1 ns, meeting IEC 61000-4-2 Level 4 (8 kV contact) requirements. |
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 VWM (12 V), higher VC (20.1 V), DO-214AC (SMA) package | Not qualified to AEC-Q101; limited to consumer/industrial use where 3000 W surge immunity is not required | Select when cost sensitivity outweighs automotive qualification and surge energy demands. |
| 1.5KE12A | Higher VWM (12 V), same VBR range, 1500 W PPPM, axial DO-201 package | Through-hole mounting only; unsuitable for automated SMT assembly or space-constrained designs | Choose only for legacy through-hole systems requiring field-replaceable surge protection. |
Compared with SMAJ12A and 1.5KE12A, the 3KASMC12AHE3/9AT delivers triple the surge power handling in an AEC-Q101-qualified SMT package - enabling single-device protection for demanding automotive and industrial 12 V rails without layout or qualification compromises.
Availability
3KASMC12AHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC power inputs, and telecom power rail protection requiring stable component supply, AEC-Q101 compliance, and high-temperature operational continuity.
Supply support for 3KASMC12AHE3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The 3KASMC12AHE3/9AT belongs to Vishay's PAR® family of high-power TVS diodes, engineered specifically for automotive and industrial environments where AEC-Q101 qualification, 185 °C operation, and 3000 W surge immunity are mandatory.
FAQ
What is the clamping voltage of the 3KASMC12AHE3/9AT under maximum surge conditions?
The 3KASMC12AHE3/9AT has a maximum clamping voltage (VC) of 19.9 V at 151 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value ensures downstream 12 V logic and analog circuits remain within safe operating limits during high-energy transients. The 3KASMC12AHE3/9AT maintains this clamping performance across its full operating temperature range up to 185 °C junction temperature.
Is the 3KASMC12AHE3/9AT qualified for automotive applications?
Yes, the 3KASMC12AHE3/9AT is AEC-Q101 qualified and rated for TJ = 185 °C, making it suitable for under-hood and transmission-control module applications. It meets all stress tests defined in the AEC-Q101 standard, including HTGB, HTRB, and temperature cycling. The 3KASMC12AHE3/9AT is explicitly listed in Vishay's AEC-Q101 qualified product matrix for TVS diodes.
What does the "HE3/9AT" suffix indicate in 3KASMC12AHE3/9AT?
The "HE3/9AT" suffix denotes the packaging configuration: "HE3" indicates the base part is qualified to AEC-Q101 and RoHS-compliant, while "9AT" specifies 13-inch diameter plastic tape-and-reel packaging with 3500 units per reel. This matches Vishay's ordering code convention shown in Document 89962, Section "ORDERING INFORMATION".
How does the 3KASMC12AHE3/9AT compare to bi-directional TVS diodes in the same package?
The 3KASMC12AHE3/9AT is uni-directional only and cannot suppress negative-going transients - unlike bi-directional variants such as 3KASMC12CA. Its lower leakage (<2 μA at VWM) and tighter VBR tolerance make it preferable for DC power rail protection where reverse conduction is unnecessary. The 3KASMC12AHE3/9AT achieves superior clamping efficiency for positive-only surges due to optimized junction design.
What is the thermal resistance profile of the 3KASMC12AHE3/9AT?
The 3KASMC12AHE3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 18.3 °C/W and junction-to-ambient (RθJA) of 77.5 °C/W under standard SMT pad layout conditions. These values enable reliable operation at full 6.0 W steady-state dissipation when leads are soldered to copper planes. The 3KASMC12AHE3/9AT thermal performance is validated per JEDEC JESD51-2 and JESD51-14 standards.
3KASMC12AHE3/9AT 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):
- 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)
3KASMC12AHE3/9AT FAQ
1.How can I place an order for 3KASMC12AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHE3/9AT 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 3KASMC12AHE3/9AT reliable?
The price and inventory of 3KASMC12AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC12AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHE3/9AT?
3KASMC12AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHE3/9AT 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 3KASMC12AHE3/9AT?
For technical support, including 3KASMC12AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHE3/9AT requirements.
6.How does Aetrix verify that 3KASMC12AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHE3/9AT 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 3KASMC12AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHE3/9AT?
All 3KASMC12AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHE3/9AT, 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 3KASMC12AHE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC12AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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