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Vishay General Semiconductor - Diodes Division 5KASMC40AHM3/9A
- Part No.:
- 5KASMC40AHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5KASMC40AHM3/9A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,176
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Product details
Overview
5KASMC40AHM3/9A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, rated for 40 V stand-off voltage, 44.4–49.1 V breakdown voltage at 1 mA, 64.5 V maximum clamping voltage at 77.5 A peak pulse current, and 5000 W peak pulse power (10/1000 µs). It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics against inductive switching transients.
For engineers reviewing the 5KASMC40AHM3/9A datasheet, 5KASMC40AHM3/9A pinout, 5KASMC40AHM3/9A application, or 5KASMC40AHM3/9A equivalent, key selection criteria include clamping performance under 77.5 A surge, unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, and DO-214AB thermal resistance (RθJA = 100 °C/W).
Technical Context
The 5KASMC40AHM3/9A employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional architecture provides fast response time and excellent clamping capability during transient events such as load dump or inductive kickback.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and supports operation up to TJ = 185 °C. The device is qualified per JESD201 Class 2 for whisker resistance and MSL Level 1 (260 °C reflow peak), with halogen-free, RoHS-compliant construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Ensures reliable breakdown initiation within defined tolerance band |
| VC @ IPPM | 64.5 V at 77.5 A - Clamping voltage limits downstream component stress during worst-case 10/1000 µs surge |
| PPPM (10 × 1000 µs) | 5000 W - Sustains high-energy transients without failure in automotive and industrial environments |
| TJ max | +185 °C - Enables placement near hot components (e.g., power MOSFETs, DC-DC converters) without derating |
| RθJA | 100 °C/W - Thermal resistance defines temperature rise under 6.5 W steady-state dissipation on standard PCB pad layout |
| Polarity | Unidirectional - Cathode-banded configuration protects only against positive transients on anode-to-cathode path |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point during positive overvoltage event | Connected to protected line (e.g., 12 V rail, sensor output); must be routed with low-inductance trace |
| Cathode | Transient current return path to ground or reference rail | Connected to low-impedance ground plane; critical for achieving specified clamping voltage |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable VBR and low leakage (<2 µA at VWM) across temperature |
| AEC-Q101 qualification | Validated for automotive under-hood applications including engine control units and body electronics |
| High-temperature operation | Rated for continuous operation up to +185 °C junction temperature, enabling use in thermally constrained layouts |
| Low clamping ratio (VC/VBR) | ~1.35 - Minimizes overvoltage exposure to protected ICs while maintaining robust surge handling |
| MSL Level 1 compliance | Supports lead-free reflow up to 260 °C peak without moisture-induced damage |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in engine control modules from load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive surges to limit voltage seen by downstream PMICs and microcontrollers. Use Value: Withstands 5000 W pulses and maintains clamping at ≤64.5 V, preventing latch-up or permanent damage to 40 V-rated power ICs. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response TVS shunts transient energy before it reaches precision ADC inputs or op-amp buffers. Use Value: Low 2 µA leakage at 40 V ensures minimal impact on sensor offset and gain accuracy over full temperature range. |
| Telecom DC Power Input | Consumer Power Adapter Output |
Use Scenario: Safeguarding PoE-powered switch ports against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary protection device placed at DC input stage ahead of DC-DC controllers and isolation transformers. Use Value: 77.5 A peak surge current rating handles IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs) test levels without degradation. |
Use Scenario: Suppressing turn-on transients in USB-C PD adapter secondary-side 20 V output rails. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbs overshoot during dynamic load steps and prevents overvoltage trips in connected devices. Use Value: 40 V VWM aligns precisely with 20 V ±10% output tolerance, avoiding false triggering while ensuring margin for 64.5 V clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/5AT | Same DO-214AC (SMA) package; lower PPPM (400 W), higher RθJA (~150 °C/W), VBR = 44.4–49.1 V | Limited to low-power consumer interfaces; not AEC-Q101 qualified or rated for TJ = 185 °C | Select when cost sensitivity outweighs automotive reliability or high-energy surge needs |
| 1.5KE40A | Through-hole DO-201AE package; same VWM/VBR/VC specs but larger footprint and manual assembly requirement | Suitable for legacy industrial designs where reworkability and thermal mass are prioritized over board space | Choose only if existing PCB layout prohibits SMT or requires higher mechanical robustness in vibration-prone environments |
Compared with SMAJ40A-E3/5AT and 1.5KE40A, the 5KASMC40AHM3/9A delivers 12.5× higher peak pulse power in a surface-mount package with automotive qualification, enabling compact, high-reliability protection in next-generation ECUs and power supplies where thermal and surge margins are critical.
Availability
5KASMC40AHM3/9A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor protection, telecom DC input stages, and consumer power adapter outputs requiring stable component supply and long-term lifecycle support.
Supply support for 5KASMC40AHM3/9A 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 reliability, efficiency, and application-specific optimization.
The 5KASMC40AHM3/9A belongs to Vishay's PAR® series of high-power surface-mount TVS diodes, engineered specifically for harsh-environment transient suppression in automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and 185 °C operation are mandatory.
FAQ
What is the maximum clamping voltage of the 5KASMC40AHM3/9A under peak surge conditions?
The 5KASMC40AHM3/9A exhibits a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 77.5 A using a 10/1000 µs waveform. This value is measured per Figure 3 in the official Vishay datasheet (Document Number: 89432) and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is the 5KASMC40AHM3/9A suitable for automotive applications?
Yes, the 5KASMC40AHM3/9A is AEC-Q101 qualified and rated for junction temperatures up to +185 °C, making it suitable for under-hood and powertrain applications. Its DO-214AB package, halogen-free construction, and MSL Level 1 reflow compatibility further support automotive manufacturing requirements.
What does the "HM3/9A" suffix indicate in 5KASMC40AHM3/9A?
The "HM3" denotes Vishay's halogen-free, RoHS-compliant, AEC-Q101-qualified base construction, while "/9A" specifies the packaging format: 13-inch diameter plastic tape and reel containing 3500 units. This differs from "/57", which indicates 7-inch tape and reel with 850 units.
How does the 5KASMC40AHM3/9A compare to bidirectional TVS diodes?
The 5KASMC40AHM3/9A is unidirectional and protects only against positive transients on the anode-to-cathode path. Unlike bidirectional variants, it cannot suppress negative-going surges without external circuitry. Its advantage lies in lower leakage (<2 µA at 40 V) and tighter VBR tolerance-critical for DC rail protection where reverse conduction must be avoided.
What is the thermal resistance of the 5KASMC40AHM3/9A in standard mounting conditions?
The 5KASMC40AHM3/9A has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended PCB pad layout. This value increases significantly with reduced copper area and affects steady-state power dissipation limits-its 6.5 W rating assumes TM = 50 °C on an infinite heatsink.
5KASMC40AHM3/9A 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- 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)
5KASMC40AHM3/9A FAQ
1.How can I place an order for 5KASMC40AHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KASMC40AHM3/9A 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 5KASMC40AHM3/9A reliable?
The price and inventory of 5KASMC40AHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KASMC40AHM3/9A is usually 5 days.
3.What payment methods are accepted for 5KASMC40AHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KASMC40AHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KASMC40AHM3/9A?
5KASMC40AHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KASMC40AHM3/9A 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 5KASMC40AHM3/9A?
For technical support, including 5KASMC40AHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KASMC40AHM3/9A requirements.
6.How does Aetrix verify that 5KASMC40AHM3/9A is sourced from the original manufacturer or authorized distributors?
All 5KASMC40AHM3/9A 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 5KASMC40AHM3/9A meets industry standards.
7.What is the process for return or replacement of 5KASMC40AHM3/9A?
All 5KASMC40AHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with 5KASMC40AHM3/9A, 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 5KASMC40AHM3/9A part is unused and in its original packaging.
Return procedure for 5KASMC40AHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
5KASMC40AHM3/9A Tags
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