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Vishay General Semiconductor - Diodes Division SM8S43CAHM3/I
- Part No.:
- SM8S43CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S43CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
SM8S43CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), 6600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for TJ = 175 °C operation in harsh environments.
For engineers reviewing the SM8S43CAHM3/I datasheet, SM8S43CAHM3/I pinout, SM8S43CAHM3/I application, or SM8S43CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where ISO 7637-2 surge immunity, low leakage (<10 μA at VWM), and DO-218AC thermal performance are critical design requirements.
Technical Context
This TVS diode operates as a clamping device across power rails to limit transient overvoltages induced by inductive switching or load dump events. Its bidirectional structure enables symmetrical clamping without polarity dependency, and its DO-218AC package provides low thermal resistance (RθJM = 0.35 °C/W) for efficient heat transfer to the PCB metal heatsink.
The SM8S43CAHM3/I delivers 95.1 A peak pulse current (IPPM) at 69.4 V maximum clamping voltage (VC) under 10/1000 μs waveform, meeting ISO 16750-2 test conditions for automotive electronics. Its MSL Level 1 rating and matte tin-plated terminals ensure robust solderability and long-term reliability in reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43.0 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system operating margin for 12 V/24 V automotive rails. |
| VBR (min/max) | 47.8 V / 52.8 V - Breakdown occurs within this range at 5 mA test current; ensures predictable turn-on timing during transients. |
| VC @ IPPM | 69.4 V - Clamping voltage at 95.1 A peak pulse; defines worst-case overvoltage seen by downstream ICs during ISO 7637-2 Pulse 5a. |
| PPPM (10/1000 μs) | 6600 W - Peak surge energy handling capability; supports high-energy load dump events without failure. |
| TJ max | 175 °C - Junction temperature rating enabling use in engine bay and powertrain modules without derating. |
| Leakage @ VWM | <10 μA at 25 °C - Minimal standby power loss and negligible impact on low-power sensor circuits. |
| Package | DO-218AC - Surface-mount package with integrated metal heatsink terminal; enables direct thermal coupling to PCB copper pour. |
Pinout & Package
DO-218AC package: two-terminal SMD device with exposed metal cathode pad (Lead 2) serving as primary thermal path and electrical connection; Lead 1 is anode-side terminal. No polarity marking required due to bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode-side terminal | Connects to protected line (e.g., battery rail); forms one side of bidirectional clamping path. |
| Lead 2 / Metal Heatsink | Cathode-side terminal & thermal interface | Primary current return path and main thermal conduction path to PCB copper; must be soldered to ≥100 mm² copper area for RθJM = 0.35 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD47; supports PPAP documentation. |
| ISO 7637-2 & ISO 16750-2 compliance | Passes Pulse 5a (load dump) testing up to 35 V superimposed on 14 V system; verified clamping performance under standardized surge profiles. |
| DO-218AC thermal performance | RθJM = 0.35 °C/W enables >8 W steady-state dissipation when mounted on ≥2 oz. FR4 with full heatsink pad; reduces need for external heatsinking. |
| Halogen-free, RoHS-compliant, MSL Level 1 | Meets automotive environmental standards and supports lead-free reflow (245 °C peak); eliminates whisker risk per JESD201 Class 2. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Interface |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and analog sensors from 12 V battery rail transients during alternator load dump. IC Role / Device Role: Primary clamping TVS placed directly at ECU input connector before bulk capacitance. Use Value: Limits clamped voltage to ≤69.4 V during 35 V/100 ms load dump event, preventing damage to 75 V-rated DC-DC converters and LDOs. |
Use Scenario: Shields BCM power supply from jump-start surges and relay coil flyback in lighting and door module circuits. IC Role / Device Role: Bidirectional overvoltage clamp on fused 12 V distribution line feeding multiple submodules. Use Value: Withstands ≥5000 cycles of 25 V/100 ms pulses while maintaining <10 μA leakage, ensuring long-term stability in always-on functions. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Safeguards image sensor and ISP power inputs against ignition-induced transients in front-facing camera modules. IC Role / Device Role: Secondary protection stage after upstream fuse and common-mode choke; placed adjacent to camera SoC. Use Value: Low junction capacitance (<100 pF at 43 V) avoids signal integrity degradation on high-speed MIPI interfaces powered from same rail. |
Use Scenario: Protects gate drivers and current sense amplifiers from inductive kickback during EPS motor commutation. IC Role / Device Role: High-energy clamping element across 24 V motor supply bus, thermally anchored to chassis ground plane. Use Value: 6600 W peak power rating handles repetitive 10/1000 μs surges up to 95.1 A without parametric shift, supporting ASIL-B functional safety goals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CA | Lower PPPM (400 W vs. 6600 W); DO-214AC package; RθJA = 110 °C/W vs. 55 °C/W. | Not suitable for load dump; limited to low-energy ESD and inductive spikes in non-automotive consumer systems. | Select SMAJ43CA only for cost-sensitive, low-surge applications where PCB space is constrained and thermal mass is minimal. |
| TPSMA6L43A | Unidirectional; lower VC (69.4 V same), but IPPM = 72.5 A; no AEC-Q101 qualification; RθJA = 85 °C/W. | Lacks bidirectional symmetry and automotive qualification; requires external polarity management in DC systems. | Choose TPSMA6L43A only for industrial 24 V DC supplies where unidirectional protection suffices and AEC-Q101 is not mandated. |
Compared with SMAJ43CA and TPSMA6L43A, the SM8S43CAHM3/I uniquely combines AEC-Q101 qualification, 6600 W surge capacity, bidirectional operation, and DO-218AC thermal performance-making it the only viable option for automotive load dump protection in ECUs, BCMs, and EPS systems requiring sustained 175 °C operation.
Availability
SM8S43CAHM3/I is available at Aetrix Electronics and suitable for automotive power rail protection, engine control unit (ECU) input conditioning, and body control module (BCM) battery interface applications requiring stable component supply across multi-year production programs.
Supply support for SM8S43CAHM3/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 SM8S series is part of Vishay's PAR® TVS platform engineered specifically for automotive-grade transient suppression-designed to meet ISO 7637-2 load dump and ISO 16750-2 surge requirements in under-hood and powertrain environments.
FAQ
What is the clamping voltage of the SM8S43CAHM3/I under standard surge conditions?
The SM8S43CAHM3/I has a maximum clamping voltage (VC) of 69.4 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 95.1 A. This value is measured per Figure 4 in the official Vishay datasheet (Doc. #98229) and defines the upper voltage limit imposed on protected circuitry during ISO 7637-2 Pulse 5a load dump events. The SM8S43CAHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM8S43CAHM3/I suitable for 24 V automotive systems?
Yes, the SM8S43CAHM3/I is explicitly designed for both 12 V and 24 V automotive systems. Its 43 V stand-off voltage (VWM) provides adequate margin above nominal 24 V rail voltages while allowing reliable clamping during load dump transients up to 35 V. The device's AEC-Q101 qualification, 175 °C junction rating, and ISO 7637-2 compliance confirm its suitability for under-hood and powertrain applications where the SM8S43CAHM3/I is deployed.
Does the SM8S43CAHM3/I require a heatsink on the PCB?
The SM8S43CAHM3/I does not require an external heatsink but mandates proper PCB thermal design: its DO-218AC package relies on soldering Lead 2 (metal heatsink terminal) to a minimum 100 mm² copper area on inner or outer layers to achieve the specified RθJM = 0.35 °C/W. Without this copper pour, thermal resistance degrades significantly, limiting power handling. The SM8S43CAHM3/I's thermal performance is optimized for direct PCB conduction-not ambient-air cooling.
How does the HM3 suffix affect the SM8S43CAHM3/I specification?
"HM3" denotes halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD201 Class 2 for whisker resistance and AEC-Q101 for automotive reliability. It confirms the SM8S43CAHM3/I meets material sustainability and long-term plating integrity requirements-distinct from non-HM3 variants that may lack these qualifications. The "I" suffix indicates packaging in 13″ tape-and-reel with anode orientation toward sprocket holes.
Can the SM8S43CAHM3/I replace older SM8S43A parts in existing designs?
The SM8S43CAHM3/I is a direct replacement for legacy SM8S43A variants in terms of electrical parameters and DO-218AC mechanical fit, but adds AEC-Q101 qualification, halogen-free materials, and enhanced thermal performance. Designers may retain the same footprint and layout; however, validation per ISO 7637-2 and thermal testing under worst-case ambient conditions is recommended before full deployment of the SM8S43CAHM3/I.
SM8S43CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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-218AB
SM8S43CAHM3/I FAQ
1.How can I place an order for SM8S43CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S43CAHM3/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 SM8S43CAHM3/I reliable?
The price and inventory of SM8S43CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S43CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S43CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S43CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S43CAHM3/I?
SM8S43CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S43CAHM3/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 SM8S43CAHM3/I?
For technical support, including SM8S43CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S43CAHM3/I requirements.
6.How does Aetrix verify that SM8S43CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S43CAHM3/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 SM8S43CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S43CAHM3/I?
All SM8S43CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S43CAHM3/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 SM8S43CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S43CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S43CAHM3/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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