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Vishay General Semiconductor - Diodes Division 3KASMC40AHM3_B/H
- Part No.:
- 3KASMC40AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHM3_B/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
3KASMC40AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor in SMC (DO-214AB) package, rated for 40 V stand-off voltage (VWM), 46.8 V nominal breakdown (VBR), 3000 W peak pulse power (10/1000 μs), and 185 °C maximum junction temperature - deployed for automotive-grade ESD and surge protection on power rails and signal lines of engine control units and ADAS sensor interfaces.
For engineers reviewing the 3KASMC40AHM3_B/H datasheet, 3KASMC40AHM3_B/H pinout, 3KASMC40AHM3_B/H application, or 3KASMC40AHM3_B/H equivalent, key selection criteria include clamping voltage (64.5 V at IPPM), unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJL = 18.3 °C/W) under high-reliability automotive operating conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for stable performance up to TJ = 185 °C. Its unidirectional architecture provides low clamping voltage (VC = 64.5 V) and fast response time against transients induced by inductive load switching.
It delivers 3000 W peak pulse power per 10/1000 μs waveform while maintaining low incremental surge resistance and meets MSL Level 1 (260 °C reflow). The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (nom) | 46.8 V - breakdown voltage at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 64.5 V - clamping voltage at 46.5 A peak pulse current, limiting protected circuit stress |
| PPPM | 3000 W - transient energy absorption capability under standardized 10/1000 μs surge |
| TJ max. | +185 °C - enables operation in under-hood automotive environments without derating |
| Polarity | Unidirectional - protects against positive-going transients only; cathode marked |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 77.5 °C/W RθJA |
Pinout & Package
Package: SMC (DO-214AB), molded case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode | Current exit terminal during forward conduction; clamping node | Connected to protected line; absorbs surge energy when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable 185 °C operation and long-term reliability in automotive under-hood applications |
| AEC-Q101 qualification | Validated for automotive electronics per stress-test requirements including HTRB, HTGB, and TCT |
| Halogen-free & RoHS | HM3 suffix confirms compliance with environmental regulations and JEDEC JESD201 Class 2 whisker resistance |
| Low RθJL | 18.3 °C/W junction-to-lead thermal resistance supports high-power transient dissipation without heatsink |
| MSL Level 1 | Rated for peak reflow temperature of 260 °C - compatible with standard lead-free assembly processes |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Sensor Interface |
|---|---|
Use Scenario: Protection of 12 V power rail against load dump and alternator ripple transients in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits voltage excursions to ≤64.5 V during 3000 W surges, preventing damage to downstream PMICs and microcontrollers. |
Use Scenario: Surge suppression on FAKRA or coaxial video signal lines connecting radar/camera modules to domain controllers. IC Role / Device Role / Timing Role: Fast-response transient suppressor on differential analog video path with minimal capacitance impact. Use Value: Clamps ESD events (IEC 61000-4-2) and inductive spikes without distorting 1–3 GHz video bandwidth due to low junction capacitance. |
| Industrial Motor Drive Power Stage | Telecom Base Station DC Feeder Line |
Use Scenario: Input protection for 48 V DC bus feeding IGBT gate drivers and current sense amplifiers in servo drives. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC link, coordinated with upstream fusing and MOVs. Use Value: Withstands repetitive 200 A IFSM surges and maintains clamping stability across -65 °C to +185 °C ambient range. |
Use Scenario: Secondary-level surge protection on -48 V telecom DC feeder lines entering remote radio units (RRUs). IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing lightning-induced surges before they reach PoE injectors or RF front-end ICs. Use Value: 40 V VWM ensures no leakage during normal operation; 64.5 V VC limits stress on isolated DC/DC converters rated for 75 V max input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40AHE3_A/H | Same VWM/VBR/VC specs but lower PPPM (400 W), smaller SMA package, non-AEC-Q101 | Limited to commercial-grade consumer/industrial use; not qualified for automotive under-hood deployment | Select when cost and board space are critical and AEC-Q101 is not required |
| SMCJ40AHE3_A/H | Identical SMC package, same 3000 W PPPM, but HE3 suffix indicates standard RoHS (not halogen-free); AEC-Q101 qualified | Meets automotive reliability but lacks halogen-free certification required by some Tier 1 OEMs | Choose if halogen-free compliance is not mandated and supply chain prefers HE3 variant |
Compared with SMAJ40AHE3_A/H and SMCJ40AHE3_A/H, the 3KASMC40AHM3_B/H uniquely combines AEC-Q101 qualification, halogen-free construction, and 185 °C junction rating - making it the only option certified for high-temperature automotive powertrain and chassis systems where both environmental and thermal robustness are mandatory.
Availability
3KASMC40AHM3_B/H is available at Aetrix Electronics and suitable for automotive ECU designs, ADAS sensor interfaces, industrial motor drive power stages, and telecom DC feeder protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KASMC40AHM3_B/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 high-reliability, high-temperature, and automotive-qualified components.
The 3KASMCxxA family was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - targeting under-hood power distribution, body electronics, and ADAS subsystems demanding extended temperature operation and halogen-free compliance.
FAQ
What is the clamping voltage of the 3KASMC40AHM3_B/H at its rated peak pulse current?
The 3KASMC40AHM3_B/H has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 46.5 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on the protected circuit during transient events. The 3KASMC40AHM3_B/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC40AHM3_B/H qualified for automotive applications?
Yes, the 3KASMC40AHM3_B/H is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix HM3. It undergoes rigorous stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT) to validate reliability in automotive powertrain and chassis systems. The 3KASMC40AHM3_B/H is rated for continuous operation up to TJ = 185 °C.
What does the 'HM3' suffix indicate in 3KASMC40AHM3_B/H?
The 'HM3' suffix in 3KASMC40AHM3_B/H denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, distinguishing it from the HE3 variant. It also confirms AEC-Q101 qualification and compatibility with lead-free reflow profiles up to 260 °C (MSL Level 1). The 'B/H' indicates packaging in 7-inch tape-and-reel format with 850 units per reel.
How does the thermal performance of the 3KASMC40AHM3_B/H compare to standard SMC TVS diodes?
The 3KASMC40AHM3_B/H features a typical junction-to-lead thermal resistance (RθJL) of 18.3 °C/W - significantly lower than many legacy SMC TVS devices - enabling efficient heat transfer to PCB copper without external heatsinking. Its 185 °C maximum junction temperature and 77.5 °C/W junction-to-ambient rating (RθJA) allow sustained operation in high-ambient environments where standard TVS diodes would require derating.
Can the 3KASMC40AHM3_B/H be used in bidirectional configurations?
No, the 3KASMC40AHM3_B/H is strictly unidirectional, as explicitly stated in the Vishay datasheet. It protects only against positive-going transients on the cathode side relative to anode. For bidirectional protection, two 3KASMC40AHM3_B/H devices must be connected in series opposition, or a dedicated bidirectional TVS such as SMBJ40CA should be selected - but that part lacks AEC-Q101 and 185 °C rating.
3KASMC40AHM3_B/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:
- Active
- 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 (SMC)
3KASMC40AHM3_B/H FAQ
1.How can I place an order for 3KASMC40AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHM3_B/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_B/H reliable?
The price and inventory of 3KASMC40AHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHM3_B/H?
3KASMC40AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHM3_B/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_B/H?
For technical support, including 3KASMC40AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHM3_B/H requirements.
6.How does Aetrix verify that 3KASMC40AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHM3_B/H?
All 3KASMC40AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for 3KASMC40AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC40AHM3_B/H Tags
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