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Vishay General Semiconductor - Diodes Division 3KASMC40HE3_A/H
- Part No.:
- 3KASMC40HE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40HE3_A/H.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,725
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Product details
Overview
3KASMC40HE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount 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 interface protection.
For engineers reviewing the 3KASMC40HE3_A/H datasheet, 3KASMC40HE3_A/H pinout, 3KASMC40HE3_A/H application, or 3KASMC40HE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, MSL Level 1 rating, and 3000 W transient suppression capability under automotive-grade reliability conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low incremental surge resistance and fast response time, enabling effective clamping of inductive switching transients before downstream ICs or MOSFETs are damaged. Its junction temperature rating up to 185 °C supports under-hood automotive environments without derating penalties beyond standard curves.
The device operates exclusively in unidirectional configuration with cathode band marking, requires no external biasing, and delivers stable clamping performance across -65 °C to +185 °C junction range. Thermal resistance is characterized as RθJA = 77.5 °C/W (typ.) and RθJL = 18.3 °C/W (typ.), supporting reliable power dissipation on standard SMC pad layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum reverse operating voltage before significant leakage; defines safe working limit for continuous DC or AC signal lines. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown threshold range ensures predictable turn-on during overvoltage events. |
| PPPM | 3000 W (10/1000 μs) - Peak transient energy handling capacity sufficient for ISO 7637-2 Pulse 1/2a/5a automotive load dump suppression. |
| IPPM | 46.5 A - Peak surge current capability directly determines clamping voltage (VC = 64.5 V) under standardized test waveform. |
| VC | 64.5 V at IPPM - Clamped voltage level that must remain below absolute maximum ratings of protected devices (e.g., MCU I/O, gate drivers). |
| TJ max. | 185 °C - Enables sustained operation in high-temperature zones such as engine control units without thermal shutdown or parameter drift. |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress test requirements including HTRB, HTGB, and temperature cycling. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, MSL Level 1 (260 °C peak reflow), cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse transient clamp. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V battery rail); receives surge energy and initiates avalanche breakdown when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage performance (<1 μA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
| 3000 W peak pulse power (10/1000 μs) | Supports robust protection against severe automotive load dump and inductive kick events without degradation over lifetime. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and ADAS modules requiring zero-failure field performance. |
| TJ = 185 °C capability | Eliminates need for thermal derating in under-hood applications up to ambient +125 °C with proper PCB copper area. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD, relay bounce), improving system-level immunity margin. |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Suppresses load dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed circuits in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and local regulator input to clamp surges before LDO or DC-DC stage. Use Value: Limits voltage to ≤64.5 V during 3000 W pulses, preventing damage to 45 V-rated input capacitors and regulators in ECUs. |
Use Scenario: Protects analog sensor inputs (e.g., MAP, TPS) and digital communication lines (LIN, CAN power supply) inside engine control modules. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected from signal line to ground, activated within nanoseconds of overvoltage onset. Use Value: Maintains <1 μA leakage at 40 V, ensuring minimal impact on precision sensor biasing while clamping fast transients to safe levels. |
| Industrial Motor Drive I/O Protection | Telecom Power Interface Protection |
Use Scenario: Shields microcontroller GPIOs and isolated feedback signals from inductive kickback in 24 V industrial PLC outputs. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector entry point, referenced to local ground plane adjacent to optocoupler inputs. Use Value: Withstands 200 A non-repetitive forward surge (8.3 ms half-sine), surviving repeated contactor switching without parametric shift. |
Use Scenario: Guards primary-side DC input of telecom power supplies against lightning-induced surges on -48 V distribution lines. IC Role / Device Role / Timing Role: High-power TVS placed upstream of input filter and bridge rectifier to absorb bulk surge energy before conditioning stages. Use Value: Delivers 3000 W pulse handling with 64.5 V clamping, compatible with -48 V nominal systems where 70 V abs max is typical for front-end FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Lower PPPM = 400 W; VC = 64.5 V at 6.4 A; DO-214AC (SMA) package; RθJA = 110 °C/W | Not AEC-Q101 qualified; limited to consumer/industrial use; insufficient for automotive load dump | Select only for cost-sensitive, non-automotive designs with lower surge energy requirements. |
| SMCJ40A | Same DO-214AB package; PPPM = 1500 W; VC = 64.5 V at 23.3 A; AEC-Q101 qualified; TJ = 175 °C | Half the peak power rating; suitable for ISO 7637-2 Pulse 1/2a but not Pulse 5a compliance | Choose when full 3000 W headroom is unnecessary and board space allows same footprint with reduced thermal margin. |
Compared with SMAJ40A and SMCJ40A, the 3KASMC40HE3_A/H provides 2× higher peak power than SMCJ40A and 7.5× more than SMAJ40A, while maintaining identical clamping voltage and extending junction temperature capability to 185 °C - critical for next-generation automotive electronics requiring extended thermal life and full ISO 7637-2 compliance.
Availability
3KASMC40HE3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, engine control unit (ECU) input safeguarding, and industrial motor drive I/O shielding requiring stable component supply, AEC-Q101 validation, and high-temperature operational integrity.
Supply support for 3KASMC40HE3_A/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 devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 3KASMC series is designed specifically for high-energy transient suppression in harsh automotive and industrial environments, combining AEC-Q101 qualification, 185 °C junction capability, and 3000 W pulse robustness in compact SMC packaging.
FAQ
What is the exact breakdown voltage range for 3KASMC40HE3_A/H?
The 3KASMC40HE3_A/H has a guaranteed breakdown voltage range of 44.4 V to 49.1 V measured at 1 mA test current (IT), per Vishay Document Number 89962. This range reflects manufacturing tolerance and ensures consistent avalanche initiation across production lots while maintaining compatibility with 40 V nominal systems.
Is 3KASMC40HE3_A/H AEC-Q101 qualified?
Yes, the 3KASMC40HE3_A/H is explicitly AEC-Q101 qualified as stated in the Vishay datasheet (Document Number 89962, page 1). It has passed all required stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling - confirming suitability for automotive powertrain and body electronics applications.
What does the "_A/H" suffix mean in 3KASMC40HE3_A/H?
The "_A/H" suffix in 3KASMC40HE3_A/H indicates a specific packaging variant: "A" denotes the base part revision, and "H" specifies the preferred package code for 7-inch diameter plastic tape and reel delivery with 850 units per reel, per Vishay's ordering information table (page 2 of Document 89962).
Can 3KASMC40HE3_A/H be used in bidirectional configurations?
No, the 3KASMC40HE3_A/H is unidirectional only, as confirmed in the Features section of the Vishay datasheet. It conducts only during reverse-biased overvoltage events and must be oriented with the cathode band toward the protected line. For bidirectional protection, two devices in series opposition or a dedicated bidirectional TVS would be required.
What is the maximum clamping voltage of 3KASMC40HE3_A/H at rated surge current?
The maximum clamping voltage (VC) of 3KASMC40HE3_A/H is 64.5 V at its rated peak pulse current (IPPM) of 46.5 A, tested with a 10/1000 μs waveform. This value is fixed per the electrical characteristics table (page 2 of Document 89962) and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
3KASMC40HE3_A/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:
- 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_A/H FAQ
1.How can I place an order for 3KASMC40HE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40HE3_A/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 3KASMC40HE3_A/H reliable?
The price and inventory of 3KASMC40HE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC40HE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC40HE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40HE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40HE3_A/H?
3KASMC40HE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40HE3_A/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 3KASMC40HE3_A/H?
For technical support, including 3KASMC40HE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40HE3_A/H requirements.
6.How does Aetrix verify that 3KASMC40HE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC40HE3_A/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 3KASMC40HE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC40HE3_A/H?
All 3KASMC40HE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40HE3_A/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 3KASMC40HE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC40HE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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