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Vishay General Semiconductor - Diodes Division 3KASMC40AHM3_A/I
- Part No.:
- 3KASMC40AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,177
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Product details
Overview
3KASMC40AHM3_A/I 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 rail and sensor line protection.
For engineers reviewing the 3KASMC40AHM3_A/I datasheet, 3KASMC40AHM3_A/I pinout, 3KASMC40AHM3_A/I application, or 3KASMC40AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, TJ = 185 °C maximum junction temperature, MSL Level 1 rating, 18.3 °C/W junction-to-lead thermal resistance, and uni-directional polarity with cathode band marking.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under high-temperature operation up to 185 °C and withstand repetitive surge stress per IEC 61000-4-5. Its low incremental surge resistance and fast response time ensure effective suppression of transients induced by inductive load switching.
The device operates exclusively in uni-directional mode, with VF = 3.5 V at 100 A forward surge and RθJA = 77.5 °C/W (typical). It meets JESD201 Class 2 whisker test requirements and UL 94 V-0 flammability standard for the molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum reverse operating voltage before clamping begins; defines safe DC/AC bias limit for protected circuit. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM for robust transient detection. |
| VC @ IPPM | 64.5 V - Clamping voltage at 46.5 A peak pulse; determines maximum voltage seen by downstream ICs during surge event. |
| PPPM | 3000 W (10/1000 µs) - Peak pulse power handling capacity; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 threats. |
| TJ max. | 185 °C - Enables use in under-hood automotive environments and high-power industrial control without derating penalties. |
| Polarity | Uni-directional - Requires correct orientation in series with positive supply rail; blocks reverse leakage below VWM, conducts only during overvoltage. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 mm × 6.60 mm footprint and 3.20 mm height; supports automated placement and reflow. |
Pinout & Package
DO-214AB (SMC) package with two terminals: anode and cathode. Cathode identified by molded band on body. Designed for PCB mounting using minimum recommended pad layout per datasheet Figure 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input reference node for uni-directional clamping | Connected to protected line (e.g., +12 V rail); forms forward path during negative transients when used in reverse-biased configuration. |
| Cathode | Clamping output / surge return path | Connected to ground or lower-potential reference; sinks surge current into ground plane during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Junction passivation optimized design | Reduces leakage drift and improves long-term stability at TJ = 150–185 °C - critical for extended-life modules in harsh environments. |
| MSL Level 1, peak reflow 260 °C | Enables single-pass lead-free reflow assembly without moisture-induced damage - eliminates pre-bake requirement for high-volume SMT lines. |
| Low RθJL = 18.3 °C/W | Supports efficient heat transfer from junction to PCB copper pads - enables higher sustained surge duty cycles without thermal runaway. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation material - satisfies flame-retardancy requirements for automotive and industrial safety certifications. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Uni-directional TVS placed between power input and ground to clamp surges above 40 V. Use Value: Limits voltage excursion to ≤64.5 V during 3000 W pulses, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface to shunt fast transients before reaching ADC front-end. Use Value: With 1.0 μA IR at VWM and fast response, it avoids signal distortion while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding PoE-powered equipment inputs from lightning-induced surges on outdoor Ethernet cables. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input rail upstream of DC/DC converter. Use Value: Handles 46.5 A peak current at 64.5 V clamping, meeting IEC 61000-4-5 4 kV/2 Ω combination wave requirements. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Parallel-mounted across motor terminals to absorb energy from L·di/dt spikes during commutation. Use Value: 3000 W pulse rating and 200 A IFSM enable repeated suppression of >100 mJ transients without degradation. |
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 | Same DO-214AC (SMA) package but lower PPPM (400 W), lower IPPM (12.3 A), and VBR = 44.4–49.1 V - not AEC-Q101 qualified. | Limited to consumer/industrial grade; unsuitable for automotive under-hood use due to TJ max = 150 °C and no AEC-Q101 validation. | Select SMAJ40A only for cost-sensitive non-automotive designs where 400 W surge capability suffices. |
| SMCJ40A | Same DO-214AB (SMC) package, same VBR/VC specs, same 3000 W rating, but rated for TJ = 175 °C and AEC-Q101 compliant - minor thermal margin reduction vs. 3KASMC40AHM3_A/I. | Valid for most automotive applications, though 3KASMC40AHM3_A/I's 185 °C rating offers extended margin for high-ambient zones like power inverters. | Choose SMCJ40A when full 185 °C capability is not required and legacy qualification alignment is preferred. |
Compared with SMAJ40A and SMCJ40A, the 3KASMC40AHM3_A/I delivers superior high-temperature endurance (185 °C), tighter process control via PAR® architecture, and verified performance under extended AEC-Q101 stress conditions - making it optimal for next-generation automotive power systems demanding zero field failure.
Availability
3KASMC40AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power system integration requiring stable component supply, long lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for 3KASMC40AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 3KASMCxxA family was engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing elevated junction temperature operation, AEC-Q101 compliance, and robust surge handling in compact SMC packages.
FAQ
What is the clamping voltage of the 3KASMC40AHM3_A/I at its rated peak pulse current?
The 3KASMC40AHM3_A/I has a maximum clamping voltage VC of 64.5 V at its rated peak pulse current IPPM of 46.5 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The 3KASMC40AHM3_A/I maintains this clamping performance across its full operating temperature range up to TJ = 185 °C.
Is the 3KASMC40AHM3_A/I suitable for automotive applications?
Yes, the 3KASMC40AHM3_A/I is AEC-Q101 qualified and rated for TJ = 185 °C, making it suitable for under-hood automotive applications including engine control units, ADAS camera modules, and body control modules. Its DO-214AB package, MSL Level 1 rating, and passivated junction structure meet stringent automotive reliability and manufacturability requirements - all validated per the official Vishay qualification report for the 3KASMCxxA series.
What does the "HM3_A/I" suffix indicate in 3KASMC40AHM3_A/I?
The "HM3" denotes RoHS-compliant, AEC-Q101-qualified DO-214AB packaging with matte tin-plated leads and JESD201 Class 2 whisker resistance. The "_A/I" suffix specifies tape-and-reel packaging: "I" indicates 3500-unit reels on 13-inch diameter carriers, while "A" is the revision code per Vishay's internal documentation. This matches ordering code 3KASMC40AHM3_A/I in the official Vishay Document Number 89962.
How does the thermal performance of the 3KASMC40AHM3_A/I compare to standard SMC TVS diodes?
The 3KASMC40AHM3_A/I features a typical junction-to-lead thermal resistance RθJL of 18.3 °C/W - significantly lower than many legacy SMC TVS devices (often >25 °C/W). This enables more efficient heat dissipation into PCB copper, supporting higher surge repetition rates and extended operation at TJ = 150–185 °C. Its RθJA of 77.5 °C/W is measured on the minimum recommended pad layout per datasheet Figure 4.
Does the 3KASMC40AHM3_A/I have bidirectional capability?
No, the 3KASMC40AHM3_A/I is strictly unidirectional, as confirmed in the Vishay datasheet section "FEATURES" and "PRIMARY CHARACTERISTICS". It must be oriented with cathode toward ground to protect positive rails. For bidirectional protection, Vishay offers separate part numbers such as 3KASMC40CA; the 3KASMC40AHM3_A/I does not support symmetrical clamping or AC line protection without external circuitry.
3KASMC40AHM3_A/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:
- 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/I FAQ
1.How can I place an order for 3KASMC40AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHM3_A/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_A/I reliable?
The price and inventory of 3KASMC40AHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHM3_A/I?
3KASMC40AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHM3_A/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_A/I?
For technical support, including 3KASMC40AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHM3_A/I requirements.
6.How does Aetrix verify that 3KASMC40AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHM3_A/I?
All 3KASMC40AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for 3KASMC40AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC40AHM3_A/I Tags
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