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Vishay General Semiconductor - Diodes Division 3KASMC40HE3/9AT
- Part No.:
- 3KASMC40HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40HE3/9AT.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,955
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Product details
Overview
3KASMC40HE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 40 V stand-off voltage, 44.4–49.1 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 μs), 46.5 A peak surge current, and 64.5 V clamping voltage at IPPM - deployed for automotive power line and sensor signal line protection.
For engineers reviewing the 3KASMC40HE3/9AT datasheet, 3KASMC40HE3/9AT pinout, 3KASMC40HE3/9AT application, or 3KASMC40HE3/9AT equivalent, this page delivers verified electrical specs, thermal resistance (RθJA = 77.5 °C/W), AEC-Q101 qualification status, MSL Level 1 rating, and real-world clamping behavior under transient stress.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable junction operation up to TJ = 185 °C, enabling use in under-hood automotive environments. Its unidirectional polarity and low incremental surge resistance ensure rapid response (<1 ns) and consistent clamping during inductive switching transients.
The device meets J-STD-020 MSL Level 1 with 260 °C reflow peak, features matte tin-plated leads compliant with JESD 22-B102, and is qualified to AEC-Q101 for automotive reliability. Thermal resistance from junction to ambient is 77.5 °C/W on standard PCB pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum reverse operating voltage before significant leakage; defines safe working range for 12 V/24 V automotive supply rails. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Tight breakdown tolerance ensures predictable turn-on during overvoltage events. |
| PPPM | 3000 W (10/1000 μs) - Sustains high-energy transients common in load-dump and ISO 7637-2 Pulse 5a testing. |
| IPPM | 46.5 A - Peak surge current capability directly determines survivability against defined transient waveforms. |
| VC | 64.5 V at IPPM - Clamping voltage limits downstream IC/MOSFET stress; critical for protecting 48 V-tolerant receivers. |
| TJ max | 185 °C - Enables placement near heat sources (e.g., engine control units) without derating penalties. |
| RθJA | 77.5 °C/W - Predicts junction temperature rise under DC bias; informs thermal design on standard FR-4 layouts. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode indicated by color band. Dimensions: 7.11 × 6.60 × 3.20 mm (L × W × H). RoHS-compliant, halogen-free, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward conduction | Connected to protected circuit ground or low-side return path; defines unidirectional clamping direction. |
| Cathode | Current exit terminal; marked with band | Connected to protected line (e.g., CAN_H, LIN, 12 V rail); absorbs positive transients toward ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per AEC test plan. |
| 185 °C junction rating | Supports operation in high-temperature zones (e.g., powertrain ECUs) without derating below full power capability. |
| 77.5 °C/W RθJA | Enables thermal modeling on standard 1-oz copper pads; allows accurate junction temp estimation under continuous leakage conditions. |
| MSL Level 1 (260 °C) | Permits single-pass lead-free reflow without moisture-induced failure; eliminates bake requirement pre-assembly. |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage overshoot during fast transients, reducing risk of gate oxide damage in protected MOSFETs. |
Applications
| Automotive Power Line Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontrollers and power management ICs from load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive surges above 40 V. Use Value: Limits peak voltage to 64.5 V during 3000 W transients, preventing latch-up or permanent damage to 48 V-rated PMICs. |
Use Scenario: Shielding high-speed CAN_H/CAN_L differential pairs from ESD and coupled noise in vehicle body control modules. IC Role / Device Role / Timing Role: Discrete TVS on each CAN line referenced to ground, leveraging fast response (<1 ns) and low capacitance. Use Value: Maintains signal integrity by clamping transients while adding <10 pF junction capacitance at zero bias - no data rate degradation. |
| Industrial Sensor Signal Conditioning | Motor Drive Gate Driver Protection |
Use Scenario: Safeguarding analog front-ends of pressure/temperature sensors connected to long harnesses in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional suppression on sensor output lines (e.g., 4–20 mA loop, 0–5 V analog) to absorb inductive kickback. Use Value: Prevents ADC saturation and op-amp input stage damage via 64.5 V clamping, even after repeated 10/1000 μs surges. |
Use Scenario: Protecting high-side and low-side gate drivers in BLDC motor inverters from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: TVS placed across driver output and ground to clamp negative-going transients on gate nodes. Use Value: Ensures gate oxide integrity with 185 °C junction rating and 46.5 A surge handling - critical for >100 kHz PWM operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Lower PPPM (400 W), higher VC (64.5 V same), smaller SMA package (RθJA = 110 °C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a compliance. | Select when space-constrained and surge energy ≤ 400 W; verify thermal margin due to higher RθJA. |
| SMCJ40A | Same DO-214AB package, identical VWM/VBR, but rated for 3000 W and qualified to AEC-Q101 - direct functional match. | Identical application scope; validated for same automotive and industrial use cases. | Preferred if sourcing flexibility is needed; shares footprint, thermal profile, and qualification level with 3KASMC40HE3/9AT. |
Compared with SMAJ40A and SMCJ40A, the 3KASMC40HE3/9AT offers identical surge robustness and automotive qualification as SMCJ40A but with Vishay's PAR®-optimized passivation for enhanced high-temperature stability, while outperforming SMAJ40A in both energy handling and thermal resilience.
Availability
3KASMC40HE3/9AT is available at Aetrix Electronics and suitable for automotive ECU power rails, CAN/LIN bus interfaces, industrial sensor signal conditioning, and motor drive gate protection requiring stable component supply across extended temperature and high-reliability environments.
Supply support for 3KASMC40HE3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC40HE3/9AT belongs to Vishay's PAR® TVS family, engineered specifically for robust transient suppression in harsh automotive and industrial settings where junction stability up to 185 °C and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the 3KASMC40HE3/9AT under peak surge conditions?
The 3KASMC40HE3/9AT has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM = 46.5 A) using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage during standardized transient events. The 3KASMC40HE3/9AT maintains this clamping performance across its full operating temperature range.
Is the 3KASMC40HE3/9AT qualified for automotive applications?
Yes, the 3KASMC40HE3/9AT is AEC-Q101 qualified and rated for junction temperatures up to 185 °C, making it suitable for under-hood and powertrain applications. It meets MSL Level 1 per J-STD-020 and is RoHS-compliant and halogen-free. The 3KASMC40HE3/9AT is explicitly listed in Vishay's AEC-Q101 certified product documentation.
What package type does the 3KASMC40HE3/9AT use, and what are its key mechanical features?
The 3KASMC40HE3/9AT uses the DO-214AB (SMC) surface-mount package, measuring 7.11 mm × 6.60 mm × 3.20 mm. It features matte tin-plated leads solderable per J-STD-002, a cathode band marking, UL 94 V-0 molding compound, and compliance with JESD 201 Class 2 whisker resistance. The 3KASMC40HE3/9AT is supplied in 13" tape-and-reel (9AT code, 3500 units/reel).
How does the thermal resistance of the 3KASMC40HE3/9AT affect PCB layout decisions?
The 3KASMC40HE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W on standard PCB pad layout. This value assumes minimum recommended copper area per Vishay's mounting pad dimensions. To maintain safe junction temperatures under sustained leakage or repetitive surges, designers must allocate adequate copper pour and avoid excessive trace isolation. The 3KASMC40HE3/9AT's RθJA enables accurate thermal simulation without forced airflow.
What is the reverse stand-off voltage and breakdown voltage range for the 3KASMC40HE3/9AT?
The 3KASMC40HE3/9AT has a reverse stand-off voltage (VWM) of 40 V and a breakdown voltage (VBR) range of 44.4 V to 49.1 V at IT = 1 mA. This 11% VBR tolerance ensures reliable turn-on margin above normal operating voltage while avoiding false triggering during ripple or noise. These parameters are fully specified in Vishay document 89962 and confirmed for the exact 3KASMC40HE3/9AT marking variant.
3KASMC40HE3/9AT 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:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 42A
- 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)
3KASMC40HE3/9AT FAQ
1.How can I place an order for 3KASMC40HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40HE3/9AT 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 3KASMC40HE3/9AT reliable?
The price and inventory of 3KASMC40HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC40HE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC40HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40HE3/9AT?
3KASMC40HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40HE3/9AT 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 3KASMC40HE3/9AT?
For technical support, including 3KASMC40HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40HE3/9AT requirements.
6.How does Aetrix verify that 3KASMC40HE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC40HE3/9AT 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 3KASMC40HE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC40HE3/9AT?
All 3KASMC40HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40HE3/9AT, 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 3KASMC40HE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC40HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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