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Vishay General Semiconductor - Diodes Division 3KASMC40AHE3_A/I
- Part No.:
- 3KASMC40AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHE3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
3KASMC40AHE3_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), 185 °C maximum junction temperature, and AEC-Q101 qualified for automotive power line protection.
For engineers reviewing the 3KASMC40AHE3_A/I datasheet, 3KASMC40AHE3_A/I pinout, 3KASMC40AHE3_A/I application, or 3KASMC40AHE3_A/I equivalent, this page delivers verified electrical specs, thermal derating behavior, clamping performance at 46.5 A IPPM, RoHS-compliant packaging, and automotive-grade reliability validation per JESD22-B102 and MSL Level 1.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability up to TJ = 185 °C and low incremental surge resistance. Its unidirectional polarity and 64.5 V clamping voltage at 46.5 A IPPM enable robust overvoltage protection on DC power rails subject to inductive switching transients.
The device operates with 1.0 µA max reverse leakage at 40 V VWM and 1.0 µA at TJ = 150 °C, ensuring minimal standby current impact. Thermal resistance is 77.5 °C/W (junction-to-ambient) and 18.3 °C/W (junction-to-leads), supporting reliable power dissipation under sustained surge conditions when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V automotive systems. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 64.5 V at 46.5 A - Clamping voltage limits downstream IC stress during 3000 W surge events; critical for MOSFET gate and MCU I/O protection. |
| PPPM | 3000 W (10/1000 µs) - Peak pulse power rating validated per ANSI/IEEE C62.35; supports ISO 7637-2 Pulse 1 & 2a compliance testing. |
| TJ max. | 185 °C - Enables operation in under-hood automotive environments and industrial motor drive control units without thermal shutdown. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive discrete semiconductors including HTRB, HTGB, and temperature cycling. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.305–0.320 inch body length; compatible with automated pick-and-place and reflow profiles up to 260 °C peak. |
Pinout & Package
DO-214AB (SMC) package with cathode indicated by molded band; two-terminal device with anode and cathode leads suitable for PCB mounting using minimum recommended pad layout per datasheet Figure 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node; completes clamping path during positive transients on cathode side. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., battery feed); conducts surge current to ground when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage across 150 °C junction temperature. |
| MSL Level 1 rating | Moisture sensitivity level compliant per J-STD-020; allows unlimited floor life and standard reflow without baking. |
| Matte tin plating | Leads meet J-STD-002 solderability and JESD22-B102 whisker resistance Class 2, enabling long-term interconnect reliability. |
| Uni-directional polarity | Prevents reverse-bias conduction during normal operation while delivering full 3000 W clamping on positive surges only. |
| UL 94 V-0 molding | Flame-retardant encapsulant meets safety standards for automotive and industrial end equipment enclosures. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protection of 48 V battery-fed ECUs against load dump and alternator ripple in ADAS domain controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp transients above 40 V. Use Value: 64.5 V clamping at 46.5 A prevents damage to buck converter ICs rated for 65 V absolute maximum input. |
Use Scenario: Guarding gate driver supply lines in 3-phase inverter modules exposed to IGBT switching noise. IC Role / Device Role / Timing Role: TVS shunts inductive kickback from high-side gate resistors during fast turn-off events. Use Value: 185 °C junction rating sustains operation near heatsink-mounted power stages without derating loss. |
| Telecom DC Power Feeds | Consumer Appliance Mainboard Rails |
Use Scenario: Safeguarding PoE-powered switch ASICs from Ethernet cable-induced surges and lightning-induced coupling. IC Role / Device Role / Timing Role: Primary protection stage on 54 V DC input before secondary TVS and ESD arrays. Use Value: 3000 W peak power rating absorbs multiple 10/1000 µs surges per IEC 61000-4-5 Level 4 testing. |
Use Scenario: Securing microcontroller VDD lines in washing machine mainboards subjected to relay coil back-EMF. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to MCU power pins to limit voltage overshoot during pump motor commutation. Use Value: 1.0 µA leakage at 40 V avoids measurable battery drain in always-on standby modes. |
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), same DO-214AC (SMA) package, VBR 44.4–49.1 V, VC = 64.5 V at 6.2 A | Insufficient for 3000 W ISO 7637-2 Pulse 5a; limited to low-energy signal-line protection | Select 3KASMC40AHE3_A/I where automotive load-dump immunity or high-reliability industrial surge handling is required. |
| SMCJ40A | Same DO-214AB (SMC) package, identical VWM/VBR/VC ratings, but rated for 1500 W PPPM and TJ = 175 °C | Lacks AEC-Q101 qualification and 185 °C capability; not approved for under-hood deployment | Choose 3KASMC40AHE3_A/I when AEC-Q101 compliance and extended temperature margin are mandatory design requirements. |
Compared with SMAJ40A and SMCJ40A, the 3KASMC40AHE3_A/I delivers 2× higher peak pulse power, full AEC-Q101 qualification, and 10 °C higher junction temperature tolerance-enabling single-device compliance with stringent automotive EMC and reliability standards without parallel stacking or thermal derating.
Availability
3KASMC40AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial motor drives, telecom power feeds, and consumer appliance mainboards requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 3KASMC40AHE3_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, rectifiers, TVS devices, and optoelectronics with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC series was engineered specifically for demanding automotive and industrial power-line protection, combining PAR® technology, AEC-Q101 qualification, and 185 °C operation to replace legacy TVS solutions in next-generation electrified systems.
FAQ
What is the clamping voltage of the 3KASMC40AHE3_A/I at its rated peak pulse current?
The 3KASMC40AHE3_A/I has a maximum clamping voltage (VC) of 64.5 V at 46.5 A peak pulse current (IPPM), measured with a 10/1000 µs waveform. This value is specified in the Electrical Characteristics table on page 2 of Vishay document 89962 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The 3KASMC40AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC40AHE3_A/I suitable for automotive under-hood applications?
Yes, the 3KASMC40AHE3_A/I is explicitly qualified to AEC-Q101 and rated for TJ(max) = 185 °C, making it suitable for under-hood automotive applications such as engine control modules, transmission control units, and ADAS power supplies. Its passivated anisotropic rectifier structure and MSL Level 1 moisture rating further ensure reliability in high-vibration, high-temperature environments where the 3KASMC40AHE3_A/I is deployed.
What does the "_A/I" suffix indicate in 3KASMC40AHE3_A/I?
The "_A/I" suffix in 3KASMC40AHE3_A/I denotes the packaging configuration: "A" indicates the base part is qualified to AEC-Q101, and "I" specifies 13-inch diameter plastic tape and reel delivery with a base quantity of 3500 units. This matches the ordering information shown in Table 3 of Vishay document 89962, confirming the 3KASMC40AHE3_A/I is supplied in industry-standard high-volume packaging for automated assembly.
Does the 3KASMC40AHE3_A/I have bidirectional polarity?
No, the 3KASMC40AHE3_A/I is unidirectional only, as confirmed in the FEATURES section of the datasheet: "Available in uni-directional polarity only." It conducts surge current from cathode to anode during positive transients above VBR and blocks reverse current up to -40 V VWM. For bidirectional protection, a separate device such as the 3KASMC40CA would be required-not the 3KASMC40AHE3_A/I.
What is the thermal resistance of the 3KASMC40AHE3_A/I, and how does it affect layout?
The 3KASMC40AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W and junction-to-leads (RθJL) of 18.3 °C/W, per the THERMAL CHARACTERISTICS table. These values assume mounting per the recommended pad layout in the datasheet; reducing copper area or omitting thermal vias increases RθJA, potentially limiting surge duty cycle. Proper layout ensures the 3KASMC40AHE3_A/I sustains repeated 3000 W pulses without exceeding 185 °C junction temperature.
3KASMC40AHE3_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)
3KASMC40AHE3_A/I FAQ
1.How can I place an order for 3KASMC40AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHE3_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 3KASMC40AHE3_A/I reliable?
The price and inventory of 3KASMC40AHE3_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 3KASMC40AHE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHE3_A/I?
3KASMC40AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHE3_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 3KASMC40AHE3_A/I?
For technical support, including 3KASMC40AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHE3_A/I requirements.
6.How does Aetrix verify that 3KASMC40AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHE3_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 3KASMC40AHE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHE3_A/I?
All 3KASMC40AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHE3_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 3KASMC40AHE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC40AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC40AHE3_A/I Tags
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