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Vishay General Semiconductor - Diodes Division 5KASMC12AHM3/9A
- Part No.:
- 5KASMC12AHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5KASMC12AHM3/9A.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,603
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Product details
Overview
5KASMC12AHM3/9A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, rated for 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown (VBR), 5000 W peak pulse power (10/1000 µs), 251.3 A peak surge current, and 19.9 V clamping voltage at IPPM. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics against inductive switching transients.
For engineers reviewing the 5KASMC12AHM3/9A datasheet, 5KASMC12AHM3/9A pinout, 5KASMC12AHM3/9A application, or 5KASMC12AHM3/9A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, low clamping ratio (VC/VBR ≈ 1.42), and MSL Level 1 reflow compatibility - critical for high-reliability automotive PCB designs.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress and high-temperature operation up to 185 °C junction temperature. Its unidirectional configuration provides reverse-biased protection only, with fast response time and low incremental surge resistance enabling effective suppression of sub-microsecond transients.
The device is optimized for mounting on standard SMCJ pad layouts and delivers 5000 W peak pulse power per IEC 61000-4-5 (10/1000 µs waveform), while maintaining 100 °C/W typical junction-to-ambient thermal resistance without heatsinking - suitable for space-constrained automotive ECUs and industrial motor drives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage threshold for 12 V rail protection. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - verified breakdown range ensures predictable turn-on behavior across production lot and temperature. |
| VC @ IPPM | 19.9 V at 251.3 A - clamping voltage defines worst-case voltage seen by protected downstream circuit during full-rated surge. |
| PPPM (10/1000 µs) | 5000 W - peak transient energy handling capacity compliant with IEC 61000-4-5 Level 4 surge immunity testing. |
| TJ max | +185 °C - enables use in under-hood automotive environments and high-power industrial enclosures without derating. |
| Polarity | Unidirectional - protects against reverse-polarity surges only; requires correct orientation relative to DC bias. |
| Package | DO-214AB (SMCJ) - industry-standard surface-mount outline with cathode band marking; supports automated placement and J-STD-020-compliant reflow. |
Pinout & Package
DO-214AB (SMCJ) package: molded plastic case with J-bend leads, matte tin-plated terminals, UL 94 V-0 rating, and cathode band marking on one end. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); recommended pad layout per Vishay spec.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms return path during clamping event. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V supply or signal trace); absorbs positive transients when reverse-biased. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Junction passivation | Optimized anisotropic rectifier structure improves long-term stability under repeated surge stress and high-temperature storage. |
| MSL Level 1 | Rated for peak reflow temperatures up to 260 °C - eliminates moisture sensitivity concerns and bake requirements prior to assembly. |
| Low clamping ratio (VC/VBR) | 1.42 (19.9 V / 14.7 V max) - minimizes overvoltage exposure to protected ICs compared to higher-ratio alternatives. |
| 100 °C/W RθJA | Thermal resistance measured on minimum recommended pad layout - enables accurate junction temperature estimation in compact layouts. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting 12 V power rails in engine control units (ECUs) and body control modules (BCMs) from load-dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and downstream regulator/IC input. Use Value: Limits transient voltage to ≤19.9 V during 5000 W surges, preventing latch-up or gate oxide damage in automotive-grade microcontrollers and CAN transceivers. |
Use Scenario: Safeguarding gate driver inputs and feedback signal lines in variable-frequency drives (VFDs) exposed to motor commutation noise. IC Role / Device Role / Timing Role: Surge suppression on isolated analog feedback paths and PWM enable lines interfacing with IGBT/MOSFET drivers. Use Value: Maintains signal integrity under 251.3 A surge events with <1 ns response, avoiding false triggering or ADC saturation in closed-loop motor control. |
| Consumer Appliance Power Supply | Telecom Base Station DC Feeds |
Use Scenario: Input-stage protection for switched-mode power supplies (SMPS) in washing machines and HVAC controllers subjected to mains-borne transients. IC Role / Device Role / Timing Role: Primary-side TVS on bulk capacitor input, upstream of bridge rectifier and PFC stage. Use Value: Withstands 10/1000 µs surges up to 5000 W while maintaining 12 V stand-off - avoids nuisance tripping and extends electrolytic capacitor life. |
Use Scenario: DC power feed protection in 48 V telecom base station cabinets where lightning-induced surges propagate through outdoor cabling. IC Role / Device Role / Timing Role: Secondary-side TVS on -48 V distribution bus feeding RF amplifiers and digital backhaul modules. Use Value: Delivers 19.9 V clamping at full 251.3 A surge current, ensuring downstream DC-DC converters remain within absolute maximum ratings during field-deployed surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Same VWM (12 V), lower PPPM (600 W), DO-214AA (SMB) package (smaller footprint, higher RθJA = 150 °C/W) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 compliance or automotive load-dump scenarios | Select SMBJ12A only for cost-sensitive consumer applications with <1 kV surge exposure and no AEC-Q101 requirement. |
| 5.0SMDJ12A | Same VWM (12 V), identical PPPM (5000 W), but DO-214AB package with higher IR leakage (50 µA vs. 10 µA at VWM) and no AEC-Q101 qualification | Acceptable for industrial automation where automotive qualification is not mandated, but requires validation for long-term reliability at 150 °C ambient | Choose 5.0SMDJ12A for non-automotive industrial use when Vishay's AEC-Q101 certification is not contractually required. |
Compared with SMBJ12A and 5.0SMDJ12A, the 5KASMC12AHM3/9A uniquely combines AEC-Q101 qualification, 10 µA max IR at VWM, and 185 °C TJ rating - making it the only option qualified for under-hood automotive deployment with full IEC 61000-4-5 Level 4 immunity.
Availability
5KASMC12AHM3/9A is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive control, consumer appliance power supplies, and telecom base station DC feeds requiring stable component supply and long-term lifecycle support.
Supply support for 5KASMC12AHM3/9A 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, high-temperature, and automotive-qualified components.
The 5KASMC series was designed specifically for robust transient suppression in harsh automotive and industrial environments, targeting AEC-Q101 compliance, 185 °C operation, and 5000 W surge capability in surface-mount form factor.
FAQ
What is the clamping voltage of the 5KASMC12AHM3/9A at its rated peak pulse current?
The 5KASMC12AHM3/9A has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 251.3 A under a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during full-rated surge events. The 5KASMC12AHM3/9A maintains this clamping performance across its specified operating temperature range.
Is the 5KASMC12AHM3/9A suitable for automotive applications?
Yes, the 5KASMC12AHM3/9A is AEC-Q101 qualified and rated for junction temperatures up to +185 °C, making it suitable for under-hood automotive applications including engine control units, body electronics, and ADAS power domains. Its DO-214AB package meets J-STD-020 reflow standards, and the HM3 suffix confirms halogen-free, RoHS-compliant construction - all verified per Vishay Document Number 89432.
What does the "HM3/9A" suffix indicate in 5KASMC12AHM3/9A?
The "HM3" suffix denotes Vishay's halogen-free, RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads meeting JESD 22-B102 solderability and JESD 201 Class 2 whisker resistance. The "/9A" indicates packaging in 13-inch diameter plastic tape and reel with a base quantity of 3500 units - distinct from /57 (7-inch reel, 850 units) and supporting high-volume SMT assembly.
How does the 5KASMC12AHM3/9A compare to bidirectional TVS diodes?
The 5KASMC12AHM3/9A is unidirectional only and protects against positive transients on DC-biased lines - unlike bidirectional variants that suppress both polarities. Its lower leakage (10 µA max at VWM) and tighter VBR tolerance improve efficiency in 12 V systems. For AC or floating-signal protection, a bidirectional part like 5KASMC12CA would be required, but the 5KASMC12AHM3/9A offers superior clamping performance for dedicated DC rail protection.
What is the thermal resistance of the 5KASMC12AHM3/9A in standard mounting conditions?
The 5KASMC12AHM3/9A has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on Vishay's minimum recommended pad layout, and 20.8 °C/W junction-to-mount (RθJM) when soldered to a large copper area. These values enable accurate junction temperature calculation during surge events and steady-state power dissipation (PD = 6.5 W), confirming suitability for thermally constrained automotive PCBs.
5KASMC12AHM3/9A 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):
- -
- Power - Peak Pulse:
- 5000W (5kW)
- 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)
5KASMC12AHM3/9A FAQ
1.How can I place an order for 5KASMC12AHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KASMC12AHM3/9A 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 5KASMC12AHM3/9A reliable?
The price and inventory of 5KASMC12AHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KASMC12AHM3/9A is usually 5 days.
3.What payment methods are accepted for 5KASMC12AHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KASMC12AHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KASMC12AHM3/9A?
5KASMC12AHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KASMC12AHM3/9A 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 5KASMC12AHM3/9A?
For technical support, including 5KASMC12AHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KASMC12AHM3/9A requirements.
6.How does Aetrix verify that 5KASMC12AHM3/9A is sourced from the original manufacturer or authorized distributors?
All 5KASMC12AHM3/9A 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 5KASMC12AHM3/9A meets industry standards.
7.What is the process for return or replacement of 5KASMC12AHM3/9A?
All 5KASMC12AHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with 5KASMC12AHM3/9A, 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 5KASMC12AHM3/9A part is unused and in its original packaging.
Return procedure for 5KASMC12AHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
5KASMC12AHM3/9A Tags
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