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Vishay General Semiconductor - Diodes Division 3KASMC12AHM3_B/H
- Part No.:
- 3KASMC12AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHM3_B/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,345
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Product details
Overview
3KASMC12AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in SMC (DO-214AB) package, rated for 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), and 185 °C maximum junction temperature - deployed for automotive sensor line protection against inductive switching transients.
For engineers reviewing the 3KASMC12AHM3_B/H datasheet, 3KASMC12AHM3_B/H pinout, 3KASMC12AHM3_B/H application, or 3KASMC12AHM3_B/H equivalent, key selection criteria include clamping voltage (VC = 19.9 V at IPPM), unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJL = 18.3 °C/W).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under high-temperature operation up to TJ = 185 °C and meets MSL level 1 with 260 °C reflow peak. Its unidirectional architecture provides low incremental surge resistance and fast response time for transient suppression on signal lines.
Designed for automotive-grade reliability, the device features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and passes JESD 201 class 2 whisker testing. The SMC package enables high-power dissipation (PD = 6.0 W) with RθJA = 77.5 °C/W under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum reverse working voltage before clamping begins; defines safe operating margin for 12 V rail protection |
| VBR (min/typ/max) | 13.3 / 14.0 / 14.7 V at IT = 1 mA - ensures consistent breakdown across temperature and production lot |
| VC @ IPPM | 19.9 V - clamping voltage during 3000 W transient; limits stress on downstream ICs like microcontrollers or CAN transceivers |
| PPPM | 3000 W (10/1000 μs) - handles high-energy surges from inductive loads such as solenoids or motors |
| TJ max. | +185 °C - supports under-hood automotive environments without derating loss |
| Polarity | Unidirectional - protects only against positive transients relative to cathode; requires correct orientation in circuit |
| RθJL | 18.3 °C/W - low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded epoxy case meeting UL 94 V-0; cathode indicated by color band.
| 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 | Connected to signal or power line being protected; voltage referenced to anode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and enables use in green manufacturing programs |
| Junction passivation optimized design | Enhances long-term reliability under thermal cycling and humidity exposure |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning or special handling |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on protected devices while maintaining robust surge handling |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting LIN/CAN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients before they reach interface ICs. Use Value: Enables reliable operation at TJ = 185 °C and withstands 3000 W pulses without degradation - critical for ASIL-B compliant systems. | Use Scenario: Shielding PLC analog input modules and digital I/O from relay coil flyback and contact arcing in factory automation panels. IC Role / Device Role / Timing Role: Standoff protection element on 24 V DC signal lines, absorbing energy before it reaches isolation amplifiers or microcontroller GPIOs. Use Value: 19.9 V clamping voltage ensures downstream 3.3 V or 5 V logic remains within absolute maximum ratings during 10/1000 μs surges. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding USB-C PD controller communication lines and VBUS monitoring circuits against ESD and AC line coupling in wall adapters. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp on CC1/CC2 lines and VBUS sense paths to prevent latch-up or damage. Use Value: 1.0 μA leakage at 12 V ensures minimal impact on precision voltage sensing and low-power standby modes. | Use Scenario: Front-end protection of Ethernet PHYs and PoE injectors against lightning-induced surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Primary-level TVS on differential pairs, coordinated with gas discharge tubes and common-mode chokes. Use Value: 3000 W rating and 18.3 °C/W RθJL allow sustained surge absorption without thermal runaway in compact line card layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12AHE3_A/H | Lower PPPM (400 W), same VWM (12 V), SMC package, AEC-Q101 qualified | Suitable for lower-energy transients; not rated for 3000 W automotive load dump | Select when system-level surge testing does not exceed 400 W and cost sensitivity is high |
| SMCJ12AHE3_A/H | Same PPPM (3000 W), identical VWM/VBR/VC specs, SMC package, AEC-Q101 qualified, but not halogen-free | Matches 3KASMC12AHM3_B/H performance but lacks halogen-free certification | Choose if halogen-free requirement is waived and legacy supply chain compatibility is prioritized |
Compared with SMAJ12AHE3_A/H and SMCJ12AHE3_A/H, the 3KASMC12AHM3_B/H delivers identical 3000 W surge capability and AEC-Q101 qualification while adding halogen-free compliance - making it the preferred choice for new automotive designs requiring full environmental conformance.
Availability
3KASMC12AHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial motor drive I/O, consumer power adapter protection, and telecom line card surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for 3KASMC12AHM3_B/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, MOSFETs, and optoelectronics with emphasis on reliability and high-temperature performance.
The 3KASMCxxA family was engineered specifically for automotive and industrial transient suppression, combining high-temperature junction stability (TJ = 185 °C), AEC-Q101 qualification, and halogen-free packaging to meet evolving OEM and Tier-1 requirements.
FAQ
What is the clamping voltage of the 3KASMC12AHM3_B/H at its rated peak pulse current?
The 3KASMC12AHM3_B/H has a maximum clamping voltage (VC) of 19.9 V when subjected to its peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet and reflects the actual voltage seen by protected circuitry during worst-case transient events. The 3KASMC12AHM3_B/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC12AHM3_B/H AEC-Q101 qualified and what does that mean for automotive use?
Yes, the 3KASMC12AHM3_B/H is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 19-Jan-2024. This qualification validates its reliability under accelerated stress tests including temperature cycling, humidity bias, and mechanical shock - required for placement in automotive powertrain, chassis, and body electronics. The 3KASMC12AHM3_B/H meets these standards in its HM3 suffix configuration.
What is the difference between the HE3 and HM3 suffixes in the 3KASMC12A series?
The HM3 suffix on the 3KASMC12AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification, whereas HE3 indicates RoHS-compliance and AEC-Q101 qualification but not halogen-free status. Both meet JESD 201 class 2 whisker testing and MSL level 1, but only HM3 satisfies strict halogen-free mandates for green manufacturing. The 3KASMC12AHM3_B/H is the halogen-free variant.
Can the 3KASMC12AHM3_B/H be used in bidirectional transient protection applications?
No, the 3KASMC12AHM3_B/H is unidirectional only, as explicitly stated in the Vishay datasheet. It clamps positive transients relative to its cathode and conducts only in one direction. For bidirectional protection, a separate device such as the SMBJ12CAHE3_A/H would be required. Using the 3KASMC12AHM3_B/H in reverse-biased configurations risks failure or inadequate clamping.
What is the thermal resistance from junction to ambient (RθJA) for the 3KASMC12AHM3_B/H in standard mounting?
The typical thermal resistance from junction to ambient (RθJA) for the 3KASMC12AHM3_B/H is 77.5 °C/W when mounted on the minimum recommended pad layout per the Vishay datasheet. This value assumes no additional heatsinking and defines the baseline temperature rise under steady-state power dissipation. For pulsed operation, junction temperature rise is dominated by RθJL = 18.3 °C/W due to short-duration energy transfer.
3KASMC12AHM3_B/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:
- 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 (SMCJ)
3KASMC12AHM3_B/H FAQ
1.How can I place an order for 3KASMC12AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHM3_B/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 3KASMC12AHM3_B/H reliable?
The price and inventory of 3KASMC12AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC12AHM3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHM3_B/H?
3KASMC12AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHM3_B/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 3KASMC12AHM3_B/H?
For technical support, including 3KASMC12AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHM3_B/H requirements.
6.How does Aetrix verify that 3KASMC12AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHM3_B/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 3KASMC12AHM3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHM3_B/H?
All 3KASMC12AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHM3_B/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 3KASMC12AHM3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC12AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC12AHM3_B/H Tags
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