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Vishay General Semiconductor - Diodes Division 3KASMC12AHE3_B/I
- Part No.:
- 3KASMC12AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHE3_B/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,308
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Product details
Overview
3KASMC12AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in SMC (DO-214AB) package, designed for clamping inductive-switching transients and lightning-induced surges. It delivers 3000 W peak pulse power (10/1000 μs), clamps at ≤19.9 V at 151 A IPPM, and operates up to TJ = 185 °C - enabling robust protection of automotive sensor signal lines and MOSFET gate drivers.
For engineers reviewing the 3KASMC12AHE3_B/I datasheet, 3KASMC12AHE3_B/I pinout, 3KASMC12AHE3_B/I application, or 3KASMC12AHE3_B/I equivalent, key selection criteria include its 12 V stand-off voltage, 13.3–14.7 V breakdown range at 1 mA, unidirectional polarity, AEC-Q101 qualification, and SMC package thermal performance under high-reliability automotive and industrial surge conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for stable clamping under repeated surge stress. Its 185 °C maximum junction temperature and MSL Level 1 rating support reflow soldering at 260 °C peak and long-term operation in under-hood automotive environments.
The device exhibits low incremental surge resistance and fast response time, enabling effective suppression of sub-microsecond transients. Clamping voltage is specified at 19.9 V for 151 A peak pulse current (10/1000 μs), with typical VBR temperature coefficient of +0.074 %/°C - critical for thermal stability across wide ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum reverse stand-off voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/typ/max) | 13.3 / 14.0 / 14.7 V at 1 mA - precise breakdown range ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 19.9 V at 151 A - clamping voltage limits protected circuit stress during 3000 W surge (10/1000 μs) |
| PPPM | 3000 W - peak pulse power handling capability for high-energy transients like load dump or ESD |
| TJ max. | 185 °C - enables use in high-temperature automotive zones without derating penalties |
| Polarity | Unidirectional - protects against positive-going transients only; requires correct cathode orientation in PCB layout |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 77.5 °C/W RθJA and 18.3 °C/W RθJL for thermal management |
Pinout & Package
Package: SMC (DO-214AB), molded case meeting UL 94 V-0, matte tin-plated leads, cathode indicated by color band. Dimensions: 6.22 × 5.59 × 2.62 mm (L × W × H), recommended pad layout per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference; carries full surge current during clamping |
| Cathode | Protected line connection point | Connected to signal/power line being protected; voltage referenced to anode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| Junction passivation | Reduces parameter drift and leakage degradation under high-temperature, high-humidity operational stress |
| MSL Level 1 | Compatible with standard lead-free reflow profiles up to 260 °C peak without moisture-related damage |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot on protected ICs during surge events, reducing risk of latch-up or gate oxide failure |
| 10/1000 μs waveform compliance | Meets IEC 61000-4-5 surge immunity test requirements for industrial and automotive equipment |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive kickback in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients before reaching sensitive input stages. Use Value: Maintains signal integrity under 12 V system surges up to ±100 V, leveraging 12 V VWM and 19.9 V VC to prevent input-stage saturation or damage. |
Use Scenario: Safeguarding microcontroller GPIOs and optocoupler inputs connected to relay coils or solenoid drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Fast-response clamping device absorbing 3000 W inductive energy spikes generated during coil de-energization. Use Value: Limits transient voltage to ≤19.9 V within nanoseconds, preventing false triggering or permanent damage to 3.3 V/5 V logic interfaces. |
| Power Supply Input Protection | Telecom Line Interface |
Use Scenario: Secondary-side surge protection on 12 V DC input rails feeding DC-DC converters in automotive infotainment head units. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed after EMI filter but before regulator input to absorb residual transients. Use Value: Withstands 200 A IFSM (8.3 ms half-sine) and maintains <2 μA IR at 12 V, ensuring minimal standby leakage and high surge margin. |
Use Scenario: Overvoltage protection on Ethernet PHY interface lines (e.g., MDI pairs) exposed to lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Unidirectional clamping element referenced to local ground, coordinated with common-mode chokes. Use Value: Delivers 3000 W peak power handling and 19.9 V clamping at 151 A, meeting ITU-T K.21 basic protection level for telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/5AT | Lower PPPM (400 W), higher VC (20.9 V at 19.9 A), same SMC package and 12 V VWM | Not rated for AEC-Q101; suitable for consumer/industrial, not automotive-grade designs | Select when cost sensitivity outweighs automotive qualification and surge energy requirements |
| 1.5KE12A | Through-hole DO-201 package, 1500 W PPPM, 20.1 V VC at 75 A, no AEC-Q101 qualification | Requires PCB through-hole real estate and wave soldering; unsuitable for high-density SMT layouts | Choose only if legacy board design mandates axial/DO-201 footprint and lower surge energy suffices |
Compared with SMAJ12A-E3/5AT and 1.5KE12A, the 3KASMC12AHE3_B/I provides triple the surge power handling, automotive qualification, and superior thermal robustness in an SMT package - making it the preferred choice for next-generation automotive and high-reliability industrial systems where space, qualification, and energy absorption are jointly constrained.
Availability
3KASMC12AHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive inputs, and telecom line interface applications requiring stable component supply, AEC-Q101 compliance, and high-temperature reliability.
Supply support for 3KASMC12AHE3_B/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 3KASMC series is part of Vishay's PAR® TVS platform, engineered specifically for high-energy transient suppression in harsh-environment applications where AEC-Q101 qualification, 185 °C operation, and consistent clamping performance are mandatory.
FAQ
What is the breakdown voltage tolerance of the 3KASMC12AHE3_B/I?
The 3KASMC12AHE3_B/I has a guaranteed breakdown voltage range of 13.3 V (min) to 14.7 V (max) at 1 mA test current, with a typical value of 14.0 V. This tight VBR window ensures consistent clamping behavior across production lots and supports reliable design margining against system-level surge thresholds.
Is the 3KASMC12AHE3_B/I RoHS-compliant and halogen-free?
The 3KASMC12AHE3_B/I carries the HE3 suffix, indicating RoHS-compliance and AEC-Q101 qualification. It is not halogen-free; for halogen-free versions, the HM3 suffix (e.g., 3KASMC12AHM3_B/I) must be selected. Both meet JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1.
What is the maximum clamping voltage for the 3KASMC12AHE3_B/I under surge conditions?
The 3KASMC12AHE3_B/I clamps to a maximum of 19.9 V at 151 A peak pulse current (10/1000 μs waveform), as specified in the Electrical Characteristics table. This VC value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuits during worst-case transients.
Can the 3KASMC12AHE3_B/I replace older SMAJ12A devices in existing designs?
The 3KASMC12AHE3_B/I is not a direct drop-in replacement for SMAJ12A due to higher surge rating (3000 W vs. 400 W), tighter VBR tolerance, and AEC-Q101 qualification - though both share the SMC package. Layout compatibility exists, but system-level validation is required to confirm thermal and clamping behavior under actual surge profiles.
What does the "B/I" suffix mean in 3KASMC12AHE3_B/I?
The "B/I" suffix in 3KASMC12AHE3_B/I indicates revision code "B" and packaging in 13-inch diameter plastic tape and reel with 3500 units per reel. The "HE3" denotes RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads meeting JESD22-B102 solderability standards.
3KASMC12AHE3_B/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:
- Active
- 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 (SMC)
3KASMC12AHE3_B/I FAQ
1.How can I place an order for 3KASMC12AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHE3_B/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 3KASMC12AHE3_B/I reliable?
The price and inventory of 3KASMC12AHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC12AHE3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHE3_B/I?
3KASMC12AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHE3_B/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 3KASMC12AHE3_B/I?
For technical support, including 3KASMC12AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHE3_B/I requirements.
6.How does Aetrix verify that 3KASMC12AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHE3_B/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 3KASMC12AHE3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHE3_B/I?
All 3KASMC12AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHE3_B/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 3KASMC12AHE3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC12AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC12AHE3_B/I Tags
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