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Vishay General Semiconductor - Diodes Division SM6S40ATHE3/I
- Part No.:
- SM6S40ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S40ATHE3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,612
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Product details
Overview
SM6S40ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AC package, rated for 40 V stand-off voltage (VWM), 46.8 V nominal breakdown voltage (VBR), 64.5 V maximum clamping voltage (VC) at 150 A peak pulse current, and 3600 W peak pulse power (10/1000 μs). It operates from −55 °C to +175 °C and is AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM6S40ATHE3/I datasheet, SM6S40ATHE3/I pinout, SM6S40ATHE3/I application, or SM6S40ATHE3/I equivalent, key selection criteria include its 175 °C junction rating, low leakage (<10 μA at VWM), 1.0 °C/W thermal resistance (RθJC), and compliance with ISO7637-2 surge testing - critical for high-reliability automotive power rail protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping performance under repetitive surge stress. Its unidirectional polarity and heatsink-as-anode configuration enable direct mounting to chassis ground for efficient thermal dissipation in high-power transients.
The device is characterized for 10/1000 μs and 10/10 000 μs waveforms, with derated power capability above 25 °C case temperature per its defined thermal resistance (RθJC = 1.0 °C/W) and power derating curve. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (nom) | 46.8 V at 5 mA - Verified breakdown threshold ensuring predictable turn-on during transients |
| VC @ IPPM | 64.5 V at 150 A - Clamped voltage limiting downstream IC stress during 10/1000 μs surge |
| PPPM (10/1000 μs) | 3600 W - Peak surge energy handling capacity for automotive load dump events |
| TJ max | +175 °C - Enables placement near hot engine control units without derating |
| RθJC | 1.0 °C/W - Confirmed thermal path efficiency supports direct heatsink mounting |
| Polarity | Unidirectional - Anode connected to heatsink; cathode as signal terminal |
Pinout & Package
Package: DO-218AC - Surface-mount, thermally enhanced case with metal heatsink (anode) and molded cathode lead. Meets UL 94 V-0, RoHS-compliant, and JESD201 Class 2 whisker tested.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Common reference and thermal path | Must be soldered to large copper area or chassis for RθJC = 1.0 °C/W performance |
| Cathode (Lead 1) | Transient voltage sensing and clamping node | Connected to protected line (e.g., 12 V battery rail); conducts surge current to anode |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR drift <±5% over lifetime and 175 °C operation without degradation |
| AEC-Q101 qualification | Validated reliability for automotive powertrain and body electronics per stress test requirements |
| ISO7637-2 compliance | Guaranteed suppression of load dump pulses (Pulse 5a) up to 35 V, 100 ms duration |
| Low leakage ID ≤10 μA @ VWM | Minimizes standby power loss in always-on vehicle modules (e.g., CAN gateway, telematics) |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 245 °C peak without moisture-induced failure |
Applications
| Engine Control Unit (ECU) Power Protection | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Protects 12 V supply input of engine control units against alternator load dump surges up to 35 V, 100 ms. IC Role / Device Role / Timing Role: Unidirectional TVS clamps transient overvoltage before it reaches MCU power regulators and CAN transceivers. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V LDOs and microcontrollers during cold-crank and battery-disconnect events. |
Use Scenario: Shields infotainment head unit power input from switching noise and load dump in shared vehicle battery circuits. IC Role / Device Role / Timing Role: Fast-response clamping element placed upstream of DC/DC converters and audio amplifiers. Use Value: Maintains system uptime by limiting voltage excursions to <65 V, preserving display backlight drivers and USB-C PD controllers. |
| Body Control Module (BCM) Input Protection | ADAS Camera Power Interface |
Use Scenario: Secures BCM LIN bus and sensor power inputs against inductive kickback from door lock actuators and relay coils. IC Role / Device Role / Timing Role: Standoff-mode protector absorbing repetitive 100–500 A, 10/1000 μs spikes without degradation. Use Value: Extends field life beyond 15 years by maintaining <1 μA leakage at 40 V after 1000 surge cycles. |
Use Scenario: Safeguards 12 V input of surround-view camera modules exposed to vibration-induced arcing and ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp on camera PCB, mounted directly to metal shield for lowest possible RθJC. Use Value: Ensures uninterrupted video stream by clamping transients within 1 ns, avoiding pixel corruption or frame drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM6S40AHM3/I | Same electrical specs; HM3 suffix indicates halogen-free molding compound and tighter VBR tolerance (±5% vs ±10%) | Preferred for new designs targeting IPC-4101E/701B-compliant PCBs and stricter environmental compliance | Select HM3 when halogen-free requirement or tighter VBR binning is mandated by OEM specification |
| SMAJ40AHE3/A | Lower PPPM (400 W), smaller SMA package (RθJC = 40 °C/W), same VWM/VBR but higher VC (64.5 V → 64.8 V) | Suitable for space-constrained consumer-grade modules where 3600 W surge margin is not required | Choose SMAJ40AHE3/A only for non-automotive applications with lower surge exposure and no 175 °C ambient requirement |
Compared with SM6S40ATHE3/I, SM6S40AHM3/I offers identical protection performance with enhanced material compliance, while SMAJ40AHE3/A trades surge robustness and thermal capability for footprint reduction - making SM6S40ATHE3/I the optimal choice for under-hood automotive systems requiring full load dump immunity and long-term thermal stability.
Availability
SM6S40ATHE3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power interfaces requiring stable component supply across extended temperature ranges and high-surge environments.
Supply support for SM6S40ATHE3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM6SxxATHE3/I series belongs to Vishay's PAR® (Planar Avalanche Rectifier) TVS platform, engineered specifically for automotive-grade transient suppression with emphasis on thermal robustness, AEC-Q101 validation, and ISO7637-2 compliance.
FAQ
What is the maximum clamping voltage of SM6S40ATHE3/I at its rated peak pulse current?
The SM6S40ATHE3/I has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated 150 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures protected downstream circuitry remains below destructive voltage thresholds during automotive load dump events. The SM6S40ATHE3/I maintains this clamping performance with minimal variation due to its passivated junction design.
Is SM6S40ATHE3/I qualified for automotive applications?
Yes, SM6S40ATHE3/I is AEC-Q101 qualified and explicitly designed for automotive use, including under-hood environments. Its 175 °C maximum junction temperature, ISO7637-2 surge compliance, MSL Level 1 rating, and JESD201 Class 2 whisker-tested leads confirm suitability for engine control units, body control modules, and ADAS systems. The HE3 suffix denotes RoHS compliance and AEC-Q101 qualification - both verified in Vishay's official documentation for SM6S40ATHE3/I.
What does the "HE3" suffix mean in SM6S40ATHE3/I?
The "HE3" suffix in SM6S40ATHE3/I indicates RoHS-compliant construction, AEC-Q101 qualification, matte tin-plated leads compliant with J-STD-002 and JESD22-B102, and passing JESD201 Class 2 whisker testing. It also confirms the device is supplied in 13-inch plastic tape-and-reel packaging with anode orientation toward sprocket holes. This suffix is standardized across Vishay's automotive-qualified DO-218AC TVS portfolio, including SM6S40ATHE3/I.
Can SM6S40ATHE3/I replace SM5S40AT in existing designs?
SM6S40ATHE3/I is not a direct replacement for SM5S40AT due to differences in package (DO-218AC vs. DO-214AB), thermal resistance (1.0 °C/W vs. ~5.5 °C/W), and surge rating (3600 W vs. 3000 W). While both share 40 V VWM and similar VBR, the SM6S40ATHE3/I requires different PCB layout - especially for heatsink attachment - and delivers superior thermal performance. Migration requires validation of mechanical fit, thermal interface, and clamping behavior under actual load dump conditions.
What is the thermal resistance junction-to-case (RθJC) for SM6S40ATHE3/I?
The SM6S40ATHE3/I has a typical thermal resistance of 1.0 °C/W from junction to case (RθJC), measured under specified test conditions with the anode (heatsink) properly mounted to a large copper area. This low value enables effective heat extraction during high-energy transients and supports sustained operation at 175 °C junction temperature. The RθJC value is confirmed in Vishay's official datasheet for SM6S40ATHE3/I and is critical for thermal design of automotive power rails.
SM6S40ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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):
- 71A
- Power - Peak Pulse:
- 4600W (4.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AC
SM6S40ATHE3/I FAQ
1.How can I place an order for SM6S40ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S40ATHE3/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 SM6S40ATHE3/I reliable?
The price and inventory of SM6S40ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S40ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM6S40ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S40ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S40ATHE3/I?
SM6S40ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S40ATHE3/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 SM6S40ATHE3/I?
For technical support, including SM6S40ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S40ATHE3/I requirements.
6.How does Aetrix verify that SM6S40ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM6S40ATHE3/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 SM6S40ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM6S40ATHE3/I?
All SM6S40ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S40ATHE3/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 SM6S40ATHE3/I part is unused and in its original packaging.
Return procedure for SM6S40ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S40ATHE3/I Tags
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Diodes Incorporated
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