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Vishay General Semiconductor - Diodes Division 5KASMC20AHM3/9A
- Part No.:
- 5KASMC20AHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5KASMC20AHM3/9A.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,633
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Product details
Overview
5KASMC20AHM3/9A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, rated for 20 V stand-off voltage, 22.2–24.5 V breakdown at 1 mA, 5000 W peak pulse power (10/1000 μs), and 154.3 A maximum surge current, used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the 5KASMC20AHM3/9A datasheet, 5KASMC20AHM3/9A pinout, 5KASMC20AHM3/9A application, or 5KASMC20AHM3/9A equivalent, key selection criteria include clamping voltage (32.4 V at 154.3 A), unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, and DO-214AB thermal resistance (RθJA = 100 °C/W).
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and fast response to transients induced by inductive load switching or lightning surges. It delivers low incremental surge resistance and excellent clamping performance under 10/1000 μs waveform stress.
Designed for automotive-grade reliability, the 5KASMC20AHM3/9A operates across –65 °C to +185 °C junction temperature range, meets MSL Level 1 per J-STD-020 (260 °C reflow peak), and features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC signal line protection threshold. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 32.4 V at 154.3 A - Clamping voltage limits downstream device stress during 5000 W transient; critical for IC/MOSFET survivability. |
| PPPM (10/1000 μs) | 5000 W - Peak pulse power handling capability under standardized surge waveform; validates robustness against IEC 61000-4-5 level 4 threats. |
| TJ max. | +185 °C - Enables use in under-hood automotive and high-ambient industrial environments without derating penalties. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on minimum recommended pad layout; informs PCB copper area requirements. |
| AEC-Q101 | Qualified - Certified for automotive electronic systems per stress test standard, including HTGB, HTRB, and TCT. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, unidirectional polarity with cathode band marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); UL 94 V-0 molding compound; halogen-free, RoHS-compliant, and whisker-tested (JESD 201 Class 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; forms clamping loop with cathode to shunt surge energy. |
| Cathode | High-side connection point | Connected to protected line (e.g., 20 V rail or sensor input); color band identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure enhances long-term reliability under repeated surge stress and high-temperature bias. |
| Peak pulse power | 5000 W (10/1000 μs) enables protection of 12 V/24 V automotive power nets against ISO 7637-2 Pulse 1/2/5a without cascaded devices. |
| Clamping ratio (VC/VBR) | ~1.35 - Low ratio indicates efficient voltage limiting; reduces margin needed between protected IC's absolute maximum rating and clamping level. |
| Response time | < 1.0 ps - Sub-picosecond intrinsic response ensures clamping activation before transient energy couples into sensitive circuitry. |
| Thermal stability | RθJM = 20.8 °C/W - Low junction-to-mount resistance supports direct thermal coupling to copper pour or heatsink for sustained surge duty cycles. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 20 V supply rails feeding engine control unit (ECU) power management ICs from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed at ECU input stage to divert >500 A surge currents away from LDOs and microcontrollers. Use Value: Withstands 185 °C junction temperature and AEC-Q101 stress tests, ensuring functional safety compliance in ASIL-B systems. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Fast-response TVS connected between signal line and ground to suppress ESD and inductive kickback from solenoid drivers. Use Value: 32.4 V clamping voltage stays below typical op-amp absolute maximum ratings (±36 V), preventing latch-up or damage. |
| Telecom DC Power Input | Computer Peripheral USB VBUS Line |
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Primary-level TVS on input bus, coordinated with upstream MOVs to handle multi-kA surge sharing per IEC 61643-21. Use Value: 5000 W rating allows single-device coverage of Class II (6 kV/3 kA) threat levels without parallel stacking or derating. |
Use Scenario: Adding secondary-level surge protection on USB 2.0 VBUS line in docking stations exposed to hot-plug transients and ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 200 pF at 0 V) placed between VBUS and GND to avoid signal integrity degradation. Use Value: Meets USB-IF ESD immunity requirements (±15 kV air, ±8 kV contact) while maintaining <1 ns response to preserve data eye integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5AT | Lower PPPM (400 W), smaller SMA package (DO-214AC), RθJA = 150 °C/W, same VWM/VBR range. | Suitable for lower-energy consumer electronics; not rated for automotive or industrial surge classes requiring ≥5 kW. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ20A | Same DO-214AB package and 5000 W rating, but non-AEC-Q101 qualified; higher IR leakage (5 μA vs. 2 μA at VWM). | Acceptable for industrial controls where automotive qualification is not mandated; may require additional validation for extended temperature life. | Choose for cost-sensitive industrial designs where AEC-Q101 is unnecessary and full 185 °C operation is not required. |
Compared with SMAJ20A-E3/5AT and SMCJ20A, the 5KASMC20AHM3/9A provides superior thermal robustness (RθJA = 100 °C/W), lower leakage (2 μA), and certified automotive qualification-making it the preferred choice for mission-critical 20 V rail protection where reliability and surge margin are non-negotiable.
Availability
5KASMC20AHM3/9A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC input conditioning, and computer peripheral USB VBUS line protection requiring stable component supply and long-term lifecycle support.
Supply support for 5KASMC20AHM3/9A 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, MOSFETs, and protection devices with emphasis on high-reliability, high-power, and automotive-grade solutions.
The 5KASMCxxA series is part of Vishay's PAR® (Protection Against Transients) platform, engineered specifically for high-energy transient suppression in harsh environments where temperature stability, surge endurance, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the 5KASMC20AHM3/9A at its rated peak pulse current?
The 5KASMC20AHM3/9A has a maximum clamping voltage (VC) of 32.4 V when subjected to its peak pulse current (IPPM) of 154.3 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream components such as 3.3 V or 5 V logic ICs powered from a 20 V rail. The 5KASMC20AHM3/9A maintains this clamping performance across its full operating temperature range.
Is the 5KASMC20AHM3/9A suitable for automotive applications?
Yes, the 5KASMC20AHM3/9A is AEC-Q101 qualified and rated for junction temperatures up to +185 °C, making it suitable for under-hood and powertrain applications including engine control units, body control modules, and ADAS power supplies. Its DO-214AB package supports automated assembly, and the HM3 suffix confirms halogen-free, RoHS-compliant, and whisker-resistant construction-key requirements for automotive manufacturing. The 5KASMC20AHM3/9A meets all stress tests defined in AEC-Q101 Rev D.
What does the "HM3/9A" suffix indicate in the 5KASMC20AHM3/9A part number?
The "HM3" suffix denotes Vishay's halogen-free, RoHS-compliant, AEC-Q101-qualified base construction with JESD 201 Class 2 whisker resistance. The "/9A" specifies the packaging configuration: 3500 units per 13-inch plastic tape-and-reel, using the preferred package code "9A". This differs from "/57", which uses 7-inch reels with 850 units. The 5KASMC20AHM3/9A is fully compatible with standard SMT pick-and-place equipment calibrated for DO-214AB footprints.
How does the thermal resistance of the 5KASMC20AHM3/9A affect PCB layout?
The 5KASMC20AHM3/9A has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on minimum recommended pad layout, meaning each watt of dissipated power raises junction temperature by 100 °C above ambient. To sustain repeated surge events, designers must allocate ≥100 mm² of 2-oz copper connected to both terminals. For continuous power handling, mounting on infinite heatsink reduces RθJM to 20.8 °C/W-so PCB layout directly determines whether the 5KASMC20AHM3/9A operates within its 185 °C TJ limit.
Can the 5KASMC20AHM3/9A be used in bidirectional configurations?
No, the 5KASMC20AHM3/9A is unidirectional only, as confirmed in the Vishay datasheet under FEATURES and ELECTRICAL CHARACTERISTICS. It conducts only when cathode voltage exceeds anode voltage by ≥22.2 V. For AC or bipolar signal line protection (e.g., RS-485, CAN), a bidirectional TVS such as SMBJ20CA or SMCJ20CA must be selected instead. Using the 5KASMC20AHM3/9A in reverse-biased AC applications risks permanent breakdown and failure.
5KASMC20AHM3/9A 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- 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)
5KASMC20AHM3/9A FAQ
1.How can I place an order for 5KASMC20AHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KASMC20AHM3/9A 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 5KASMC20AHM3/9A reliable?
The price and inventory of 5KASMC20AHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KASMC20AHM3/9A is usually 5 days.
3.What payment methods are accepted for 5KASMC20AHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KASMC20AHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KASMC20AHM3/9A?
5KASMC20AHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KASMC20AHM3/9A 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 5KASMC20AHM3/9A?
For technical support, including 5KASMC20AHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KASMC20AHM3/9A requirements.
6.How does Aetrix verify that 5KASMC20AHM3/9A is sourced from the original manufacturer or authorized distributors?
All 5KASMC20AHM3/9A 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 5KASMC20AHM3/9A meets industry standards.
7.What is the process for return or replacement of 5KASMC20AHM3/9A?
All 5KASMC20AHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with 5KASMC20AHM3/9A, 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 5KASMC20AHM3/9A part is unused and in its original packaging.
Return procedure for 5KASMC20AHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
5KASMC20AHM3/9A Tags
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