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Vishay General Semiconductor - Diodes Division 3KASMC40AHE3/9AT
- Part No.:
- 3KASMC40AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHE3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,298
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Product details
Overview
3KASMC40AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount 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 line and sensor signal protection under AEC-Q101 qualification.
For engineers reviewing the 3KASMC40AHE3/9AT datasheet, 3KASMC40AHE3/9AT pinout, 3KASMC40AHE3/9AT application, or 3KASMC40AHE3/9AT equivalent, this page delivers verified electrical specs, thermal resistance (RθJA = 77.5 °C/W), junction temperature capability up to +185 °C, MSL Level 1 reflow compatibility, and real-world clamping behavior for high-reliability transient suppression design.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional polarity enables precise reverse-biased clamping on DC power rails and signal lines where forward conduction must be avoided during normal operation.
The device delivers 3000 W peak pulse power handling with 10/1000 µs waveform compliance and maintains clamping performance across -65 °C to +185 °C operating junction range. It meets AEC-Q101 stress testing requirements and achieves J-STD-020 MSL Level 1 rating with 260 °C peak reflow profile.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse voltage before clamping begins; sets safe operating margin for 36 V nominal automotive systems. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown threshold ensures predictable turn-on during transients without premature conduction. |
| PPPM | 3000 W (10/1000 µs) - Sustains high-energy surges common in load-dump and ISO 7637-2 Pulse 5a events. |
| IPPM | 46.5 A - Peak clamping current corresponding to 64.5 V clamping voltage; defines worst-case voltage seen by protected IC. |
| VC @ IPPM | 64.5 V - Clamped voltage level at full surge current; critical for ensuring downstream component overvoltage immunity. |
| TJ max. | +185 °C - Enables reliable operation in under-hood automotive environments and high-power industrial enclosures. |
| RθJA | 77.5 °C/W - Thermal resistance from junction to ambient; informs heatsinking needs when operating near PD = 6.0 W limit. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or lower-potential node; defines clamping path for positive transients on cathode side. |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., 12 V rail or sensor output); conducts only during overvoltage events above VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TCT, and ESD testing - required for engine control, ADAS, and body electronics. |
| Junction passivation | Stable leakage (<1 μA at VWM) and consistent VBR over lifetime, even at TJ = 150 °C. |
| MSL Level 1 | Supports standard SMT reflow without baking; compatible with 260 °C peak profile per J-STD-020. |
| Low Rsurge | Minimizes voltage overshoot during fast transients (e.g., ISO 10605 ESD), improving system-level immunity. |
| High TJ capability | Enables placement near heat sources (e.g., power MOSFETs, DC/DC converters) without derating penalties. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V/24 V battery-fed ECUs and lighting modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and ground, absorbing >3000 W surge energy within microseconds. Use Value: Prevents damage to PMICs and microcontrollers by limiting voltage to ≤64.5 V during 100 V/100 ms pulses. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors in motor drives and factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair or single-ended output to ground. Use Value: Maintains signal integrity while clamping ESD (±15 kV contact) and inductive switching spikes below IC absolute maximum ratings. |
| Telecom DC Power Input Protection | Computer Peripheral Port Protection |
|
Use Scenario: Safeguarding 48 V PoE-powered switches and base station RF modules against lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS on DC input stage, coordinated with upstream fuse and secondary filtering. Use Value: Withstands repeated 3000 W surges without degradation, supporting long-term field deployment in outdoor infrastructure. |
Use Scenario: Hardening USB, HDMI, or DisplayPort power pins against hot-plug and ESD events in docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS or auxiliary power lines, selected for fast response (<1 ns) and low leakage. Use Value: Ensures <1 μA leakage at 40 V, avoiding false power detection while delivering sub-65 V clamping during ±8 kV HBM events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Same DO-214AC (SMA) package; lower PPPM = 400 W; VC = 64.5 V at IPPM = 6.2 A - not suitable for load-dump. | Limited to low-energy ESD and signal-line use; cannot replace 3KASMC40AHE3/9AT in power-rail roles. | Select only for space-constrained PCBs where 3000 W surge capacity is unnecessary. |
| SMCJ40A | Same DO-214AB (SMC) package; identical VWM/VBR/VC; PPPM = 1500 W - half the surge capacity of 3KASMC40AHE3/9AT. | Acceptable for non-automotive industrial applications with lower surge severity (e.g., IEC 61000-4-5 Level 3). | Use where cost sensitivity outweighs need for AEC-Q101 or full 3000 W margin; verify thermal derating at TJ > 125 °C. |
Compared with SMAJ40A and SMCJ40A, the 3KASMC40AHE3/9AT provides double the peak pulse power of SMCJ40A and nearly eight times that of SMAJ40A - enabling robust protection in automotive load-dump and heavy-industrial scenarios where sustained 3000 W dissipation and +185 °C operation are mandatory.
Availability
3KASMC40AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power inputs, and computer peripheral ports requiring stable component supply with AEC-Q101 assurance and high-temperature resilience.
Supply support for 3KASMC40AHE3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, thermal performance, and automotive qualification.
The 3KASMC series was developed specifically for high-energy transient suppression in harsh-environment applications - targeting AEC-Q101-compliant automotive power systems and industrial equipment exposed to repetitive surge stress.
FAQ
What is the clamping voltage of the 3KASMC40AHE3/9AT at its rated peak pulse current?
The 3KASMC40AHE3/9AT exhibits a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 46.5 A under 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 3KASMC40AHE3/9AT maintains this clamping performance across its full operating temperature range.
Is the 3KASMC40AHE3/9AT qualified for automotive applications?
Yes, the 3KASMC40AHE3/9AT is AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, and ESD per JESD22-A114. It is approved for use in automotive powertrain, chassis, and body electronics where transient immunity and long-term reliability at elevated junction temperatures (+185 °C) are required. The 3KASMC40AHE3/9AT carries HM3 suffix indicating RoHS compliance and AEC-Q101 qualification.
What package type does the 3KASMC40AHE3/9AT use, and what are its key mechanical features?
The 3KASMC40AHE3/9AT uses the DO-214AB (SMC) surface-mount package, with dimensions of 7.11 mm × 6.22 mm × 2.62 mm (L × W × H). Key mechanical features include matte tin-plated leads compliant with J-STD-002 and JESD22-B102, UL 94 V-0 molding compound, cathode identification via color band, and MSL Level 1 rating for 260 °C reflow. The 3KASMC40AHE3/9AT's pad layout follows Vishay-recommended minimum solder mask defined in Document 89962.
How does the 3KASMC40AHE3/9AT compare to standard SMAJ or SMCJ series TVS diodes?
The 3KASMC40AHE3/9AT delivers 3000 W peak pulse power - double that of SMCJ40A (1500 W) and nearly eight times that of SMAJ40A (400 W). It also supports higher junction temperature (+185 °C vs. +150 °C for most SMCJ parts) and is explicitly AEC-Q101 qualified. While SMAJ40A uses DO-214AC and SMCJ40A uses DO-214AB, the 3KASMC40AHE3/9AT shares the same DO-214AB footprint but adds enhanced surge endurance and automotive validation. The 3KASMC40AHE3/9AT is not a drop-in replacement due to its higher power rating and thermal capability.
What is the maximum reverse leakage current of the 3KASMC40AHE3/9AT at its stand-off voltage?
The 3KASMC40AHE3/9AT specifies a maximum reverse leakage current (IR) of 1.0 µA at VWM = 40 V and TA = 25 °C. At elevated temperature (TJ = 150 °C), leakage remains ≤20 µA - confirming stable blocking behavior under high-temperature bias conditions. This low leakage ensures minimal power loss and avoids interference with sensitive monitoring circuits. The 3KASMC40AHE3/9AT's leakage performance is validated per test conditions in Vishay Document 89962.
3KASMC40AHE3/9AT 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)
3KASMC40AHE3/9AT FAQ
1.How can I place an order for 3KASMC40AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHE3/9AT 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 3KASMC40AHE3/9AT reliable?
The price and inventory of 3KASMC40AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC40AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHE3/9AT?
3KASMC40AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHE3/9AT 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 3KASMC40AHE3/9AT?
For technical support, including 3KASMC40AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHE3/9AT requirements.
6.How does Aetrix verify that 3KASMC40AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHE3/9AT 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 3KASMC40AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHE3/9AT?
All 3KASMC40AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHE3/9AT, 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 3KASMC40AHE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC40AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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