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Vishay General Semiconductor - Diodes Division SM8S43AHM3/I
- Part No.:
- SM8S43AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S43AHM3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,935
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Product details
Overview
SM8S43AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 43 V stand-off voltage (VWM), 52.8 V maximum breakdown voltage (VBR), 6600 W peak pulse power (10/1000 μs), 95.1 A peak pulse current, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM8S43AHM3/I datasheet, SM8S43AHM3/I pinout, SM8S43AHM3/I application, or SM8S43AHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where ISO 7637-2 compliance, TJ = 175 °C operation, and low leakage (<10 μA at VWM) are critical design requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping performance across -55 °C to +175 °C junction temperature. Its DO-218AB package integrates a metal heatsink anode for low thermal resistance (RθJM = 0.35 °C/W) and high surge robustness.
The device operates exclusively in unidirectional mode with a typical clamping voltage of 69.4 V at 95.1 A (10/1000 μs), enabling effective suppression of load dump transients up to 35 V peak while maintaining <1.8 V forward voltage at 100 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; sets system overvoltage trip threshold for 24 V automotive rails. |
| VBR (min–max) | 47.8–52.8 V - Breakdown voltage range at 5 mA test current; ensures predictable turn-on margin above VWM for reliable transient response. |
| VC @ IPPM | 69.4 V - Clamping voltage at 95.1 A peak pulse current (10/1000 μs); defines worst-case protected rail voltage during surge events. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capacity; supports full ISO 7637-2 load dump waveform energy without failure. |
| ID @ VWM | <10 μA - Reverse leakage at rated stand-off voltage; minimizes quiescent power loss and avoids false triggering in low-power monitoring circuits. |
| TJ max. | +175 °C - Maximum junction temperature rating; enables direct mounting on engine control unit (ECU) power stages without derating. |
| Package | DO-218AB - Surface-mount package with integral metal heatsink anode; provides mechanical robustness and low RθJM (0.35 °C/W) for high-power dissipation. |
Pinout & Package
DO-218AB package with two terminals: anode (metal heatsink base) and cathode (molded top lead). The heatsink serves as the anode connection and must be thermally coupled to PCB copper for optimal power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Base) | Positive DC rail connection / thermal path | Primary current path during clamping; also functions as low-impedance thermal interface to PCB copper pour or heatsink. |
| Cathode (Top Lead) | Transient return path / clamping node | Connected to protected line (e.g., battery feed); carries full surge current during transient events and defines clamping reference. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD47; required for under-hood deployment. |
| Junction passivation | Optimized anisotropic rectifier structure delivers stable VBR drift <0.093 %/°C and low leakage at high temperature (≤10 μA at TJ = 175 °C). |
| MSL Level 1 | Rated for reflow up to 245 °C peak; compatible with standard SMT assembly without moisture sensitivity concerns or baking requirements. |
| ISO 7637-2 compliant | Validated against Pulse 5a/b load dump waveforms; clamps transients up to 35 V peak with ≤69.4 V rail excursion at full 95.1 A surge. |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protection of 24 V supply input against alternator load dump transients during battery disconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC/DC converter input. Use Value: Limits rail voltage to ≤69.4 V during 35 V, 100 ms load dump pulses, preventing damage to downstream PMICs and microcontrollers. |
Use Scenario: Surge suppression on LIN bus power rail exposed to inductive switching noise from door lock actuators. IC Role / Device Role / Timing Role: Standoff protector on 12 V auxiliary supply feeding LIN transceivers and sensor interfaces. Use Value: Maintains <10 μA leakage at 12 V, avoiding bus bias shift while clamping 10/1000 μs spikes to ≤69.4 V with no degradation after 1000 surges. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
|
Use Scenario: Input protection for image sensor power supply subjected to ignition-induced transients in front-end camera housings. IC Role / Device Role / Timing Role: Primary TVS on 5 V or 12 V imaging subsystem rail, mounted adjacent to connector entry point. Use Value: Withstands repeated 10/1000 μs surges up to 95.1 A while operating continuously at TJ = 125 °C ambient, ensuring long-term reliability in sealed enclosures. |
Use Scenario: Protection of motor driver gate supply against back-EMF spikes generated during EPS motor commutation. IC Role / Device Role / Timing Role: Clamp on 12 V gate drive rail upstream of high-side MOSFET drivers. Use Value: Delivers 6600 W peak pulse power handling and 175 °C junction rating, enabling compact placement near power stage without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S43AHM3 | Same electrical specs and DO-218AB package; differs only in packaging - tape-and-reel vs. bulk (I suffix denotes 750-piece reel). | No functional difference; identical use in automated SMT lines requiring reel-fed placement. | Select SM8S43AHM3/I when volume production requires standardized 13" plastic tape delivery with anode orientation toward sprocket hole. |
| SM8S45AHM3/I | Higher VWM (45 V) and VBR (49.9–55.2 V); same 6600 W PPPM, 69.4 V VC, and DO-218AB package. | Better suited for 36 V or dual-battery systems; may over-clamp in 24 V designs due to higher turn-on threshold. | Choose SM8S43AHM3/I over SM8S45AHM3/I when protecting nominal 24 V rails where precise 43 V standoff is required to avoid false triggering. |
Compared with SM8S43AHM3/I, SM8S43AHM3 offers identical performance in reel format, while SM8S45AHM3/I shifts the clamping window upward-making SM8S43AHM3/I the optimal choice for validated 24 V load dump protection with minimal design margin overhead.
Availability
SM8S43AHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, body control modules, ADAS camera power inputs, and electric power steering systems requiring stable component supply under AEC-Q101 compliance and high-temperature operation.
Supply support for SM8S43AHM3/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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM8SxxA family was engineered specifically for automotive load dump and ISO 7637-2 transient suppression, emphasizing AEC-Q101 qualification, 175 °C operation, and DO-218AB thermal performance.
FAQ
What is the clamping voltage of SM8S43AHM3/I at its rated peak pulse current?
The SM8S43AHM3/I has a maximum clamping voltage (VC) of 69.4 V at its rated peak pulse current (IPPM) of 95.1 A under the 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on the protected circuit during a full-rated surge event. The SM8S43AHM3/I maintains this clamping performance across its full operating temperature range.
Is SM8S43AHM3/I suitable for 24 V automotive systems?
Yes, SM8S43AHM3/I is explicitly designed for 24 V automotive systems. Its 43 V stand-off voltage (VWM) provides appropriate margin above nominal 24 V rails while remaining below the 35 V peak of ISO 7637-2 Pulse 5 load dump transients. The SM8S43AHM3/I's AEC-Q101 qualification, 175 °C junction rating, and DO-218AB thermal performance confirm its suitability for under-hood deployment.
Does SM8S43AHM3/I meet ISO 7637-2 requirements?
Yes, SM8S43AHM3/I meets ISO 7637-2 surge specification for automotive applications, specifically validated against Pulse 5a and 5b load dump waveforms. Its 6600 W peak pulse power rating and 69.4 V clamping voltage ensure compliance when properly mounted with adequate PCB copper for thermal management. The SM8S43AHM3/I datasheet confirms this capability in its primary characteristics table.
What is the thermal resistance from junction to mount for SM8S43AHM3/I?
The SM8S43AHM3/I has a typical thermal resistance from junction to mount (RθJM) of 0.35 °C/W, measured using the Transient Dual Interface Method (JEDEC® 51-14). This low value is enabled by its DO-218AB package with integral metal heatsink anode, allowing efficient heat transfer to the PCB copper pour or external heatsink. This parameter directly supports its 8 W steady-state power dissipation capability.
How does the "I" suffix in SM8S43AHM3/I affect its specifications?
The "I" suffix in SM8S43AHM3/I indicates packaging: it denotes a 750-piece 13-inch plastic tape-and-reel delivery format with anode oriented toward the sprocket hole. All electrical, thermal, and reliability specifications-including VWM = 43 V, VBR = 47.8–52.8 V, and AEC-Q101 qualification-are identical to SM8S43AHM3. The SM8S43AHM3/I is functionally interchangeable with SM8S43AHM3 in circuit design.
SM8S43AHM3/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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 95.1A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S43AHM3/I FAQ
1.How can I place an order for SM8S43AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S43AHM3/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 SM8S43AHM3/I reliable?
The price and inventory of SM8S43AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S43AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S43AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S43AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S43AHM3/I?
SM8S43AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S43AHM3/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 SM8S43AHM3/I?
For technical support, including SM8S43AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S43AHM3/I requirements.
6.How does Aetrix verify that SM8S43AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S43AHM3/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 SM8S43AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S43AHM3/I?
All SM8S43AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S43AHM3/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 SM8S43AHM3/I part is unused and in its original packaging.
Return procedure for SM8S43AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S43AHM3/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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