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Vishay General Semiconductor - Diodes Division SM6S40AHM3/I
- Part No.:
- SM6S40AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S40AHM3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,509
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Product details
Overview
SM6S40AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 40 V stand-off voltage (VWM), 44.2 V maximum breakdown voltage (VBR), 4600 W peak pulse power (10/1000 μs), 175 °C junction temperature, and AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM6S40AHM3/I datasheet, SM6S40AHM3/I pinout, SM6S40AHM3/I application, or SM6S40AHM3/I equivalent, this device serves as a high-reliability, high-surge-capability TVS diode optimized for automotive 12 V/24 V systems requiring ISO7637-2 compliance, low leakage (<10 μA at VWM), and robust thermal performance under sustained transients.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with junction passivation optimized for stable clamping across -55 °C to +175 °C. Its DO-218AB package features a metal heatsink anode configuration enabling low thermal resistance (RθJM = 0.45 °C/W) and high surge current handling (IPPM = 79 A at 10/1000 μs).
The device operates exclusively in unidirectional polarity, with clamping voltage VC = 58.1 V at IPPM, forward voltage VF ≤ 1.9 V at 100 A, and meets MSL Level 1 per J-STD-020 with 245 °C reflow peak. It is not for new designs; replacement guidance points to SM6S40AHM3/I within the SM6S10AHM3–SM6S43AHM3 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before conduction begins; defines system working voltage margin. |
| VBR (max) | 44.2 V - Upper limit of breakdown voltage at 5 mA test current; ensures predictable turn-on threshold under production variation. |
| VC @ IPPM | 58.1 V - Clamping voltage during 79 A 10/1000 μs surge; determines protected circuit's maximum transient exposure level. |
| PPPM (10/1000 μs) | 4600 W - Peak pulse power dissipation capability; supports high-energy automotive load dump events without failure. |
| TJ max | +175 °C - Maximum junction temperature rating; enables operation in under-hood environments and high-power density layouts. |
| ID @ VWM | <10 μA - Reverse leakage current at rated stand-off voltage; minimizes standby power loss and signal integrity impact. |
| AEC-Q101 | Qualified - Certified for automotive electronic components per stress test standard; validates reliability for vehicle deployment. |
Pinout & Package
Package: DO-218AB - Surface-mount, anode-heatsink configuration with matte tin-plated terminals, UL 94 V-0 molding compound, and JESD201 Class 2 whisker resistance. Mounting pad layout follows IPC-7351 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current entry point during clamping; thermally coupled to PCB copper pour | Serves as primary thermal path (RθJM = 0.45 °C/W); must be connected to large copper area for surge energy dissipation. |
| Cathode | Current exit point during clamping; connected to protected line | Provides low-inductance path to ground or return rail; layout requires minimal trace length to maintain clamping speed. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivated anisotropic rectifier | Enables stable VBR over temperature and lifetime; eliminates parameter drift in harsh automotive environments. |
| DO-218AB metal heatsink anode | Reduces thermal resistance by >80% vs. standard SMC packages; sustains repeated 4600 W surges without derating. |
| ISO7637-2 compliance (load dump) | Validated for 12 V/24 V automotive electrical systems; clamps 10 ms exponential transients up to 60 V without degradation. |
| MSL Level 1, 245 °C peak reflow | Supports standard lead-free assembly without moisture sensitivity concerns or pre-bake requirements. |
| Low VF (≤1.9 V @ 100 A) | Minimizes forward conduction loss during bidirectional fault conditions; reduces heat generation during high-current surges. |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting 12 V battery-fed circuits during alternator load dump events (ISO7637-2 Pulse 5a/b). IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC-DC input to clamp transients to ≤58.1 V. Use Value: Prevents overvoltage damage to downstream regulators and microcontrollers during 100 V/10 ms surges. |
Use Scenario: Safeguarding ECU main power supply against switching noise and inductive kickback from solenoids/fuel injectors. IC Role / Device Role / Timing Role: Fast-response transient suppressor on 12 V input rail upstream of LDO or buck converter. Use Value: Limits clamping time to <1 ns and holds VC ≤58.1 V, preserving MCU reset logic and analog sensor accuracy. |
| Body Control Module (BCM) Power Bus | ADAS Camera Power Interface |
Use Scenario: Securing shared 12 V distribution bus powering door modules, lighting, and HVAC actuators. IC Role / Device Role / Timing Role: High-power TVS mounted at BCM main connector to absorb coupled transients from multiple loads. Use Value: Withstands 600 A IFSM and 4600 W PPPM, enabling single-device protection for multi-node subsystems. |
Use Scenario: Protecting 12 V input of automotive camera modules exposed to vibration-induced cable transients and ESD. IC Role / Device Role / Timing Role: AEC-Q101-qualified TVS integrated into camera flex PCB near connector interface. Use Value: Delivers 175 °C TJ rating and <10 μA leakage to ensure long-term reliability in sealed, thermally constrained housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM6S43AHM3/I | Higher VWM (43 V) and VBR (47.8 V max); same DO-218AB package, 4600 W PPPM, and AEC-Q101 qualification. | Better suited for 24 V nominal systems where higher stand-off margin is required before clamping. | Select SM6S43AHM3/I when protecting 24 V rails with tighter VWM-to-VBR margin needs; verify VC = 62.7 V does not exceed downstream IC absolute max ratings. |
| SMAJ40AHE3/A | Same VWM (40 V) but lower PPPM (400 W), smaller SMA package (RθJA = 110 °C/W), and no AEC-Q101 qualification. | Limited to non-automotive, low-energy industrial or consumer applications with infrequent transients. | Choose SMAJ40AHE3/A only for cost-sensitive, non-automotive designs where 4600 W surge immunity and 175 °C operation are not required. |
Compared with SM6S40AHM3/I, SM6S43AHM3/I offers extended voltage headroom for 24 V systems while retaining identical thermal and surge performance; SMAJ40AHE3/A trades significant power handling and qualification for footprint reduction and cost-making it unsuitable for automotive load dump duty.
Availability
SM6S40AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and body control modules requiring stable component supply, AEC-Q101 compliance, and high-energy transient immunity.
Supply support for SM6S40AHM3/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 SM6SxxAHM3 series is designed specifically for automotive-grade transient voltage suppression, emphasizing high-temperature stability, ISO7637-2 compliance, and robust surge endurance in under-hood environments.
FAQ
What is the clamping voltage of the SM6S40AHM3/I at its rated peak pulse current?
The SM6S40AHM3/I has a maximum clamping voltage (VC) of 58.1 V at its peak pulse current (IPPM) of 79 A under the 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SM6S40AHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM6S40AHM3/I qualified for automotive applications?
Yes, the SM6S40AHM3/I is AEC-Q101 qualified and explicitly designed for automotive use, including load dump protection per ISO7637-2. It supports junction temperatures up to +175 °C and meets MSL Level 1 reflow requirements. The SM6S40AHM3/I carries the "H" suffix denoting AEC-Q101 qualification in its ordering code.
What package type does the SM6S40AHM3/I use, and why is it significant?
The SM6S40AHM3/I uses the DO-218AB package-a surface-mount variant with an integrated metal heatsink anode. This design delivers RθJM = 0.45 °C/W, enabling superior thermal transfer versus standard SMC or SMA packages. The SM6S40AHM3/I relies on this thermal path to sustain 4600 W surges without junction overheating.
How does the SM6S40AHM3/I differ from legacy SM6S40A devices?
The SM6S40AHM3/I replaces the non-HM3 SM6S40A with enhanced manufacturability and qualification: the "HM3" suffix indicates halogen-free, RoHS-compliant construction, AEC-Q101 qualification, and JEDEC-compliant tape-and-reel packaging (750 pcs/reel, anode toward sprocket hole). The SM6S40AHM3/I retains identical electrical specs but adds automotive-grade traceability and process control.
Can the SM6S40AHM3/I be used in 24 V automotive systems?
The SM6S40AHM3/I is rated for 40 V stand-off (VWM) and 44.2 V breakdown (VBR), making it suitable for 12 V nominal systems. For 24 V systems, Vishay recommends SM6S43AHM3/I (VWM = 43 V) to maintain adequate margin above normal operating voltage. Using SM6S40AHM3/I in 24 V applications risks premature conduction and accelerated wear.
SM6S40AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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):
- 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
SM6S40AHM3/I FAQ
1.How can I place an order for SM6S40AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S40AHM3/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 SM6S40AHM3/I reliable?
The price and inventory of SM6S40AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S40AHM3/I is usually 5 days.
3.What payment methods are accepted for SM6S40AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S40AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S40AHM3/I?
SM6S40AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S40AHM3/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 SM6S40AHM3/I?
For technical support, including SM6S40AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S40AHM3/I requirements.
6.How does Aetrix verify that SM6S40AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6S40AHM3/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 SM6S40AHM3/I meets industry standards.
7.What is the process for return or replacement of SM6S40AHM3/I?
All SM6S40AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S40AHM3/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 SM6S40AHM3/I part is unused and in its original packaging.
Return procedure for SM6S40AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S40AHM3/I Tags
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