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Vishay General Semiconductor - Diodes Division SM5S43ATHE3/I
- Part No.:
- SM5S43ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S43ATHE3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,437
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Product details
Overview
SM5S43ATHE3/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), 69.4 V clamping voltage at 150 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and operates up to TJ = 175 °C.
For engineers reviewing the SM5S43ATHE3/I datasheet, SM5S43ATHE3/I pinout, SM5S43ATHE3/I application, or SM5S43ATHE3/I equivalent, this device serves as a high-reliability, AEC-Q101-qualified TVS for 12 V/24 V automotive power rail surge suppression under ISO7637-2 conditions with DO-218AC package thermal performance.
Technical Context
The SM5S43ATHE3/I uses passivated anisotropic rectifier technology optimized for junction stability at TJ = 175 °C, enabling sustained operation in under-hood automotive environments. Its unidirectional polarity configures the metal heatsink as the anode, supporting direct thermal coupling to PCB copper planes.
It delivers 3600 W peak pulse power with 10/1000 μs waveform and maintains low leakage (<10 μA at VWM = 43 V, TA = 25 °C; <15 μA at TJ = 175 °C), ensuring minimal standby power loss in always-on vehicle modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; sets system overvoltage trip threshold for 24 V nominal automotive rails. |
| VBR (max) | 52.8 V - Upper limit of breakdown voltage at 5 mA test current; defines worst-case turn-on point under temperature variation. |
| VC @ IPPM | 69.4 V - Clamping voltage at 150 A peak pulse current (10/1000 μs); determines maximum voltage seen by protected downstream ICs. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling capability; supports robust load dump immunity per ISO7637-2 Pulse 5a. |
| TJ max. | 175 °C - Maximum junction temperature rating; enables placement near heat sources without derating in engine control units. |
| RθJC | 1.0 °C/W - Junction-to-case thermal resistance; allows accurate thermal design when mounted on ≥1 in² 2 oz copper with thermal vias. |
| Polarity | Unidirectional - Anode connected to heatsink; requires correct orientation during layout to avoid reverse-bias failure during transients. |
Pinout & Package
Package: DO-218AC - Surface-mount, thermally enhanced case with metal heatsink (anode terminal) and molded body meeting UL 94 V-0. Dimensions: 16.0 mm × 9.3 mm × 3.0 mm (L × W × H), anode lead oriented toward sprocket hole in 13″ tape.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink) | High-current return path and thermal interface | Must be soldered to large copper pour or thermal pad; electrically connects to system ground or battery negative in unidirectional configuration. |
| Cathode (Lead 1) | Transient voltage sensing and clamping node | Connected to protected line (e.g., alternator output); conducts surge current to anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable VBR drift <0.093 %/°C and low leakage at 175 °C, critical for long-life automotive modules. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock - required for powertrain and body control units. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 245 °C peak, eliminating bake requirements in standard SMT assembly lines. |
| ISO7637-2 compliance | Meets Pulse 5a (load dump) requirements up to 35 V test voltage with external impedance, enabling direct integration into alternator protection circuits. |
| Low forward voltage drop | VF ≤ 2.0 V at 100 A (8.3 ms half-sine) minimizes conduction loss during high-current surges, reducing thermal stress on adjacent components. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) CAN Bus Power Rail |
|---|---|
Use Scenario: Protects ECU main 12 V supply against alternator load dump transients during battery disconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS clamps voltage spikes to ≤69.4 V within nanoseconds, shielding microcontroller power domains and analog sensors. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V LDOs and MCU I/Os by limiting transient energy via 3600 W peak power dissipation. | Use Scenario: Shields BCM's 5 V or 3.3 V CAN transceiver power rail from coupled surges on shared vehicle battery lines. IC Role / Device Role / Timing Role: Fast-response TVS placed upstream of local regulators, absorbing coupled transients before they propagate to isolated CAN PHY circuitry. Use Value: Maintains CAN bus communication integrity during ignition cycling by suppressing sub-100 ns edge transients with <10 μA leakage at 43 V. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Supply | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Guards image sensor and ISP power inputs in front-facing ADAS cameras exposed to under-hood thermal and electrical stress. IC Role / Device Role / Timing Role: High-temperature-stable TVS operating continuously at TJ = 150 °C, clamping surges without parameter shift. Use Value: Ensures uninterrupted video capture during cold-crank and load dump by maintaining VBR stability across -55 °C to +175 °C. | Use Scenario: Protects gate drivers and current sense amplifiers in EPS motor control inverters from inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional suppressor placed across H-bridge high-side driver supply, diverting flyback energy to chassis ground. Use Value: Enables reliable 500 A surge current handling (IFSM) without degradation, supporting repeated motor stall events in steering assist cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S43AHM3 | Same electrical specs, but HM3 suffix indicates halogen-free molding compound and enhanced moisture sensitivity level (MSL 1) with improved whisker resistance (JESD 201 Class 2). | Preferred for new designs targeting RoHS+halogen-free compliance and extended storage in humid environments. | Select SM5S43AHM3 for new designs; SM5S43ATHE3/I remains valid for legacy production and repair where HE3-specified parts are mandated. |
| SMAJ43A | Lower PPPM (400 W vs. 3600 W), smaller SMA package (RθJC = 40 °C/W vs. 1.0 °C/W), no AEC-Q101 qualification. | Suitable only for low-energy transients in non-automotive industrial controls; cannot replace SM5S43ATHE3/I in load dump scenarios. | Use SMAJ43A only in cost-sensitive, non-automotive applications with <500 W surge requirements and ambient TJ <125 °C. |
Compared with SM5S43AHM3, the SM5S43ATHE3/I offers identical electrical performance but lacks halogen-free certification and updated whisker testing; compared with SMAJ43A, it provides 9× higher surge power, 40× better thermal resistance, and full AEC-Q101 qualification - making it irreplaceable for automotive load dump protection.
Availability
SM5S43ATHE3/I is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, body control module surge suppression, and electric power steering systems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SM5S43ATHE3/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 and automotive-grade solutions.
The SM5SxxAT family was engineered specifically for under-hood automotive transient suppression, combining DO-218AC thermal efficiency with AEC-Q101 validation to meet ISO7637-2 load dump requirements in modern 12 V/24 V vehicle architectures.
FAQ
Is SM5S43ATHE3/I qualified for automotive applications?
Yes, SM5S43ATHE3/I is AEC-Q101 qualified and rated for TJ = 175 °C operation, making it suitable for engine control units, body control modules, and other automotive systems requiring validated reliability. The HE3 suffix confirms RoHS compliance and JESD 201 Class 2 whisker resistance, fulfilling key automotive manufacturing requirements.
What is the clamping voltage of SM5S43ATHE3/I at rated surge current?
The SM5S43ATHE3/I has a maximum clamping voltage (VC) of 69.4 V at 150 A peak pulse current with a 10/1000 μs waveform. This value ensures downstream 5 V or 3.3 V regulators and microcontrollers remain within safe operating limits during ISO7637-2 load dump events.
Can SM5S43ATHE3/I replace SM5S43AHM3 in existing designs?
SM5S43ATHE3/I shares identical electrical specifications and DO-218AC mechanical dimensions with SM5S43AHM3, but differs in material content: HE3 uses standard RoHS-compliant molding compound, while HM3 adds halogen-free formulation and enhanced whisker resistance. No PCB changes are needed, though HM3 is preferred for new designs.
What is the thermal resistance of SM5S43ATHE3/I, and how does it affect layout?
SM5S43ATHE3/I has a typical junction-to-case thermal resistance (RθJC) of 1.0 °C/W. To maintain TJ ≤ 175 °C under 3600 W surge, the anode (metal heatsink) must be soldered to ≥1 in² of 2 oz copper with ≥6 thermal vias - enabling effective heat spreading during repetitive transient events.
Does SM5S43ATHE3/I meet ISO7637-2 requirements?
Yes, SM5S43ATHE3/I meets ISO7637-2 surge specification for Pulse 5a (load dump) when used with appropriate series impedance. Its 3600 W peak pulse power and 175 °C junction rating allow it to absorb standardized 35 V/100 ms exponential waveforms common in 12 V automotive systems.
SM5S43ATHE3/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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 52A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
SM5S43ATHE3/I FAQ
1.How can I place an order for SM5S43ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S43ATHE3/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 SM5S43ATHE3/I reliable?
The price and inventory of SM5S43ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S43ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM5S43ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S43ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S43ATHE3/I?
SM5S43ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S43ATHE3/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 SM5S43ATHE3/I?
For technical support, including SM5S43ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S43ATHE3/I requirements.
6.How does Aetrix verify that SM5S43ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM5S43ATHE3/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 SM5S43ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM5S43ATHE3/I?
All SM5S43ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S43ATHE3/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 SM5S43ATHE3/I part is unused and in its original packaging.
Return procedure for SM5S43ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S43ATHE3/I Tags
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