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Vishay General Semiconductor - Diodes Division 3KASMC40AHM3_B/I
- Part No.:
- 3KASMC40AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHM3_B/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,005
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Product details
Overview
3KASMC40AHM3_B/I 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), 64.5 V clamping voltage at 46.5 A surge current, and 185 °C maximum junction temperature - deployed for automotive-grade ESD and load-dump protection on power rails and sensor signal lines.
For engineers reviewing the 3KASMC40AHM3_B/I datasheet, 3KASMC40AHM3_B/I pinout, 3KASMC40AHM3_B/I application, or 3KASMC40AHM3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 rating, and thermal resistance of 18.3 °C/W (junction-to-leads).
Technical Context
This device uses passivated anisotropic rectifier technology to deliver stable clamping under high-temperature operation up to TJ = 185 °C, with low incremental surge resistance and fast response time critical for suppressing inductive switching transients. Its unidirectional architecture enables robust forward conduction during overvoltage events while maintaining low leakage (<1.0 μA at VWM) at 25 °C and <20 μA at TJ = 150 °C.
The 3KASMC40AHM3_B/I is designed for mounting on minimum recommended pad layout per JEDEC MO-136, achieving RθJL = 18.3 °C/W and RθJA = 77.5 °C/W. It meets JESD201 Class 2 whisker test requirements and supports reflow soldering up to 260 °C peak per J-STD-020 MSL Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/typ/max) | 44.4 / 46.8 / 49.1 V at 1 mA - precise breakdown threshold enabling predictable turn-on behavior |
| VC @ IPPM | 64.5 V at 46.5 A - clamping voltage limits downstream IC stress during 10/1000 μs surge events |
| PPPM | 3000 W - peak pulse power handling capability for automotive load-dump and ISO 7637-2 transient suppression |
| TJ max. | +185 °C - extended junction temperature rating supports under-hood and high-reliability industrial deployment |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 0.305" x 0.220" footprint and matte tin-plated leads |
| AEC-Q101 | Qualified - certified for automotive electronic systems per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: SMC (DO-214AB), cathode-indicated by molded band; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected line (e.g., battery rail); conducts surge current toward ground path |
| Cathode | Current exit terminal during clamping | Connected to system ground; color band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable VBR drift ≤ ±5 % over lifetime and temperature |
| High-temperature operation | Rated for continuous operation at TJ = 185 °C - enables placement near heat sources without derating |
| Surge robustness | Withstands 200 A non-repetitive forward surge (8.3 ms half-sine) - protects against motor commutation spikes |
| Low clamping ratio | VC/VBR ≈ 1.38 - tight voltage margin preserves safe operating area of downstream MOSFETs and controllers |
| Halogen-free & RoHS | HM3 suffix denotes halogen-free molding compound and full RoHS compliance - meets automotive material standards |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses ISO 7637-2 Pulse 5a (load dump) transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ground, clamping surges within 1 ns response time. Use Value: Limits rail voltage to ≤64.5 V during 3000 W pulses, preventing damage to 40 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shields analog front-end inputs of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback. IC Role / Device Role / Timing Role: Standoff-mode protector on signal lines, activated only during >44.4 V transients. Use Value: Maintains <1.0 μA leakage at 40 V, preserving sensor accuracy while surviving repeated 10/1000 μs surges. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Guards 48 V PoE-powered switch ports against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary clamping device on input stage, coordinated with upstream fuse and common-mode chokes. Use Value: Delivers 3000 W pulse handling with RθJL = 18.3 °C/W, enabling compact heatsinkless designs in space-constrained enclosures. |
Use Scenario: Protects gate drivers and half-bridge MOSFETs in washing machine motor inverters from inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS across DC bus rails, absorbing energy from motor winding collapse. Use Value: Withstands 200 A surge (8.3 ms) and operates reliably at TJ = 185 °C inside sealed motor control housings. |
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 (40 V), lower PPPM (400 W), SMC package, AEC-Q101 qualified, HE3 suffix (RoHS + AEC-Q101) | Limited to lower-energy transients (e.g., ESD, IEC 61000-4-2); not suitable for load-dump or ISO 7637-2 | Select when cost sensitivity outweighs surge energy requirement and system-level testing confirms 400 W sufficiency. |
| SMCJ40AHE3_A/H | Same VWM (40 V), higher PPPM (3000 W), identical SMC package, AEC-Q101 qualified, HE3 suffix | Higher clamping voltage (69.4 V vs. 64.5 V) increases stress on downstream components; same thermal performance | Choose only if board layout allows tighter voltage margin or if existing SMCJ40AHE3_A/H inventory exists and clamping headroom is acceptable. |
Compared with SMAJ40AHE3_A/H and SMCJ40AHE3_A/H, the 3KASMC40AHM3_B/I delivers superior clamping efficiency (64.5 V vs. 69.4 V) and halogen-free construction, making it preferred for next-generation automotive and industrial designs requiring both high surge immunity and strict material compliance.
Availability
3KASMC40AHM3_B/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, telecom DC power input protection, and consumer appliance motor drive protection requiring stable component supply and long-term lifecycle support.
Supply support for 3KASMC40AHM3_B/I 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, high-temperature operation, and automotive qualification.
The 3KASMCxxA family is engineered for high-energy transient suppression in harsh environments, targeting AEC-Q101-compliant automotive subsystems and industrial equipment where thermal stability and surge robustness are critical.
FAQ
What is the clamping voltage of the 3KASMC40AHM3_B/I at its rated peak pulse current?
The 3KASMC40AHM3_B/I has a maximum clamping voltage (VC) of 64.5 V at 46.5 A peak pulse current (IPPM), measured using a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table on page 2 of Vishay document 88480 and defines the upper voltage limit imposed on protected circuits during surge events. The 3KASMC40AHM3_B/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC40AHM3_B/I qualified to AEC-Q101, and what does the HM3 suffix indicate?
Yes, the 3KASMC40AHM3_B/I is AEC-Q101 qualified, as confirmed in the Mechanical Data section of Vishay document 88480. The HM3 suffix denotes halogen-free, RoHS-compliant construction and compliance with JESD201 Class 2 whisker testing - distinguishing it from HE3 variants which are RoHS-compliant and AEC-Q101 qualified but not halogen-free.
What is the thermal resistance from junction to leads (RθJL) for the 3KASMC40AHM3_B/I, and why does it matter?
The 3KASMC40AHM3_B/I has a typical thermal resistance of 18.3 °C/W from junction to leads (RθJL), per Thermal Characteristics table on page 2 of Vishay document 88480. This parameter directly impacts power dissipation capability in real-world PCB layouts: lower RθJL enables higher sustained power handling without external heatsinking, especially critical in confined automotive and industrial enclosures where airflow is limited.
How does the 3KASMC40AHM3_B/I differ from the 3KASMC40AHE3_B/I variant?
The 3KASMC40AHM3_B/I and 3KASMC40AHE3_B/I share identical electrical specifications and SMC packaging, but differ in material composition: HM3 indicates halogen-free molding compound and RoHS compliance, whereas HE3 indicates RoHS compliance without halogen-free assurance. Both are AEC-Q101 qualified and use matte tin-plated leads meeting J-STD-002 and JESD 22-B102.
What is the maximum reverse leakage current of the 3KASMC40AHM3_B/I at elevated temperature?
At TJ = 150 °C, the 3KASMC40AHM3_B/I exhibits a maximum reverse leakage current (ID) of 20 μA at VWM = 40 V, as specified in the Electrical Characteristics table on page 2 of Vishay document 88480. This elevated-temperature leakage remains well below thresholds that would compromise low-power sensor or standby circuits, supporting reliable operation in under-hood and industrial environments.
3KASMC40AHM3_B/I 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/I FAQ
1.How can I place an order for 3KASMC40AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHM3_B/I 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/I reliable?
The price and inventory of 3KASMC40AHM3_B/I 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/I is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHM3_B/I?
3KASMC40AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHM3_B/I 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/I?
For technical support, including 3KASMC40AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHM3_B/I requirements.
6.How does Aetrix verify that 3KASMC40AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHM3_B/I 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/I meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHM3_B/I?
All 3KASMC40AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHM3_B/I, 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/I part is unused and in its original packaging.
Return procedure for 3KASMC40AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC40AHM3_B/I Tags
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