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Vishay General Semiconductor - Diodes Division 3KASMC40AHM3_A/H
- Part No.:
- 3KASMC40AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHM3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,861
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Product details
Overview
3KASMC40AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 64.5 V under 46.5 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of 40 V-rated MOSFETs and DC-DC controllers in engine control units and battery management systems.
For engineers reviewing the 3KASMC40AHM3_A/H datasheet, 3KASMC40AHM3_A/H pinout, 3KASMC40AHM3_A/H application, or 3KASMC40AHM3_A/H equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, AEC-Q101 qualification, 40 V stand-off voltage, low 1.0 µA leakage at rated VWM, and thermal resistance of 77.5 °C/W for board-level thermal design validation.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional polarity and 185 °C maximum junction temperature support operation in under-hood automotive environments where thermal derating margins are critical.
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow) and is qualified to AEC-Q101 for automotive-grade reliability. Clamping performance is specified per ANSI/IEEE C62.35 with a 10/1000 µs waveform, and its 6.0 W steady-state power dissipation enables sustained transient suppression without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines system rail compatibility. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Ensures reliable breakdown initiation above normal operating voltage with margin. |
| VC @ IPPM | 64.5 V at 46.5 A - Clamped voltage during 3000 W surge; determines protected circuit's maximum stress level. |
| IPPM | 46.5 A - Peak surge current capability with 10/1000 µs waveform; validates immunity to ISO 7637-2 Pulse 5a/b. |
| TJ max. | 185 °C - Enables use in high-ambient environments like powertrain ECUs without derating penalties. |
| RθJA | 77.5 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs heatsinking needs. |
| AEC-Q101 | Qualified - Confirms reliability for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
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 connection point | Connected to ground or low-impedance return path; forms clamping loop with cathode. |
| Cathode | High-side connection point | Connected to protected line (e.g., 40 V supply rail); conducts surge current to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage across 150 °C operating range. |
| Peak pulse power | 3000 W (10/1000 µs) supports EN 61000-4-5 Level 4 surge immunity in 40 V systems. |
| Clamping ratio | VC/VBR ≈ 1.37 - Low ratio minimizes voltage overshoot during fast transients, protecting downstream ICs. |
| Thermal robustness | 185 °C TJ max. allows uninterrupted operation in engine bay locations without external thermal management. |
| Manufacturing compliance | Meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability for safety-critical applications. |
Applications
| Automotive Power Rail Protection | Industrial DC-DC Converter Input |
|---|---|
Use Scenario: Protecting 40 V battery-fed circuits in engine control modules against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 40 V rail and chassis ground to clamp surges within safe limits. Use Value: Withstands 3000 W pulses while limiting clamped voltage to 64.5 V, preserving integrity of 75 V-rated MOSFETs and gate drivers. |
Use Scenario: Safeguarding input stage of isolated 40 V-to-12 V DC-DC converters in factory automation PLCs. IC Role / Device Role / Timing Role: Primary surge suppressor on converter input bus, absorbing repetitive switching-induced spikes and lightning-induced surges. Use Value: 1.0 µA leakage at 40 V ensures minimal standby power loss; 77.5 °C/W RθJA enables compact layout without forced air cooling. |
| Telecom Power Supply Protection | Motor Drive Gate Driver Protection |
Use Scenario: Securing 48 V telecom rectifier outputs against induced surges from nearby AC mains switching and ESD events. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across output terminals to limit transient overvoltage before reaching downstream regulators. Use Value: Fast response time and 64.5 V clamping prevent latch-up in 5 V/3.3 V LDOs and PMICs powered from the 40–48 V bus. |
Use Scenario: Shielding high-side gate drivers in 40 V BLDC motor inverters from shoot-through-induced voltage spikes during commutation. IC Role / Device Role / Timing Role: Localized TVS placed at driver IC supply pins to absorb millisecond-scale inductive kickback. Use Value: 200 A IFSM rating handles repeated surge events; AEC-Q101 qualification ensures long-term reliability in vibration-prone motor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Lower PPPM (400 W), higher VC (64.8 V), same DO-214AC (SMA) package but smaller thermal mass. | Not AEC-Q101 qualified; limited to commercial/industrial use below 150 °C. | Select when cost sensitivity outweighs automotive qualification and surge energy requirements. |
| SMCJ40A | Same DO-214AB (SMC) package, identical VWM/VBR, but lower PPPM (1500 W) and higher VC (69.4 V). | Lacks 185 °C TJ rating; rated only to 175 °C, reducing margin in high-ambient zones. | Choose if system-level surge testing confirms 1500 W suffices and thermal environment stays ≤175 °C. |
Compared with SMAJ40A and SMCJ40A, the 3KASMC40AHM3_A/H provides 100 % higher peak pulse power, 10 °C higher junction temperature rating, and AEC-Q101 qualification - making it the only option among the three suitable for under-hood automotive deployment requiring full ISO 7637-2 compliance.
Availability
3KASMC40AHM3_A/H is available at Aetrix Electronics and suitable for automotive power management, industrial DC-DC converter input protection, and telecom rectifier output safeguarding requiring stable component supply across extended production lifecycles.
Supply support for 3KASMC40AHM3_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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series belongs to Vishay's PAR® family of high-power TVS diodes, engineered specifically for AEC-Q101-compliant transient suppression in harsh-temperature automotive power systems.
FAQ
What is the clamping voltage of the 3KASMC40AHM3_A/H under maximum surge conditions?
The 3KASMC40AHM3_A/H clamps at 64.5 V when subjected to its rated peak pulse current of 46.5 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and represents the maximum voltage seen by downstream components during a full 3000 W transient event. The clamping voltage remains stable across temperature due to the device's passivated anisotropic rectifier structure.
Is the 3KASMC40AHM3_A/H suitable for automotive under-hood applications?
Yes, the 3KASMC40AHM3_A/H is AEC-Q101 qualified and rated for 185 °C maximum junction temperature, making it suitable for under-hood automotive applications such as engine control units and battery disconnect units. Its DO-214AB (SMC) package meets MSL Level 1 reflow requirements, and its thermal resistance of 77.5 °C/W supports reliable operation without additional heatsinking in typical PCB layouts.
What does the "HM3_A/H" suffix indicate in 3KASMC40AHM3_A/H?
The "HM3" denotes Vishay's RoHS-compliant, AEC-Q101-qualified base package (DO-214AB/SMC); "_A" indicates revision level A; "/H" specifies packaging in 7-inch plastic tape and reel with 850 units per reel. This ordering code aligns with Vishay's standardized delivery format for high-volume automotive production lines requiring traceable, moisture-safe handling.
How does the 3KASMC40AHM3_A/H compare to standard SMCJ-series TVS diodes?
The 3KASMC40AHM3_A/H offers higher peak pulse power (3000 W vs. 1500 W for SMCJ40A), tighter VBR tolerance (44.4–49.1 V vs. 44.4–51.3 V), and extended junction temperature rating (185 °C vs. 175 °C). It also features improved thermal resistance and is explicitly qualified to AEC-Q101 - distinguishing it from generic SMCJ variants not intended for automotive deployment.
Can the 3KASMC40AHM3_A/H be used in bidirectional configurations?
No, the 3KASMC40AHM3_A/H is unidirectional only, as confirmed in the Vishay datasheet. Its internal structure and polarity marking (cathode band) support clamping only in the reverse direction. For bidirectional protection, a separate pair of unidirectional devices or a dedicated bidirectional TVS such as the 3KASMC40CA must be used - the 3KASMC40AHM3_A/H itself does not provide symmetrical clamping behavior.
3KASMC40AHM3_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:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 46.5A
- 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)
3KASMC40AHM3_A/H FAQ
1.How can I place an order for 3KASMC40AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHM3_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 3KASMC40AHM3_A/H reliable?
The price and inventory of 3KASMC40AHM3_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 3KASMC40AHM3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHM3_A/H?
3KASMC40AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHM3_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 3KASMC40AHM3_A/H?
For technical support, including 3KASMC40AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHM3_A/H requirements.
6.How does Aetrix verify that 3KASMC40AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHM3_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 3KASMC40AHM3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHM3_A/H?
All 3KASMC40AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHM3_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 3KASMC40AHM3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC40AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC40AHM3_A/H Tags
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