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Vishay General Semiconductor - Diodes Division SM8S43AHE3_A/I
- Part No.:
- SM8S43AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S43AHE3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,192
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Product details
Overview
SM8S43AHE3_A/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), 50.3 V nominal breakdown voltage (VBR), 69.4 V clamping voltage at 95.1 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). Its DO-218AB package supports AEC-Q101 qualification and 175 °C junction operation.
For engineers reviewing the SM8S43AHE3_A/I datasheet, SM8S43AHE3_A/I pinout, SM8S43AHE3_A/I application, or SM8S43AHE3_A/I equivalent, key selection criteria include unidirectional polarity, ISO7637-2 compliance, low leakage (<10 μA at VWM), high surge robustness (700 A IFSM), and thermal resistance of 0.35 °C/W junction-to-mount - critical for under-hood automotive electronics.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and reliability in harsh environments. Its unidirectional configuration with anode-connected heatsink enables efficient thermal dissipation during load dump transients, and its 175 °C maximum junction temperature ensures sustained operation in engine compartment applications.
The device meets MSL Level 1 per J-STD-020 (245 °C peak reflow), uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and passes JESD 201 Class 2 whisker testing. Its DO-218AB package provides UL 94 V-0 flammability rating and is specifically engineered for high-energy transient suppression without degradation under repeated stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines system bus voltage compatibility. |
| VBR (nom) | 50.3 V - Breakdown voltage at 5 mA test current; ensures reliable triggering above normal operating range. |
| VC @ IPPM | 69.4 V - Clamping voltage at 95.1 A (10/1000 μs); limits downstream voltage stress during surge events. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling; supports severe ISO7637-2 load dump waveforms. |
| TJ max | +175 °C - Enables placement near heat sources in automotive ECUs without derating. |
| RθJM | 0.35 °C/W - Low junction-to-mount thermal resistance; allows direct heatsink mounting for sustained power dissipation. |
| ID @ VWM | <10 μA - Ultra-low reverse leakage at rated stand-off voltage; preserves battery drain budgets in always-on systems. |
Pinout & Package
Package: DO-218AB - Surface-mount, anode-heatsink configuration with UL 94 V-0 molding compound and matte tin-plated terminals. Mounting pad layout follows IPC 7351 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current entry point during clamping | Electrically and thermally connected to metal heatsink tab; must be soldered to large copper area for thermal management. |
| Cathode | Current exit point during clamping | Standard cathode terminal; connects to protected line (e.g., 12 V rail); polarity-critical for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| 175 °C junction rating | Enables deployment in high-ambient zones (e.g., engine control units) without thermal shutdown or parameter drift. |
| ISO7637-2 compliance | Guarantees survivability against standardized automotive load dump transients up to 100 V/10 ms exponential waveform. |
| Low VF = 1.8 V @ 100 A | Minimizes forward conduction loss during high-current surges, reducing self-heating and improving energy absorption margin. |
| MSL Level 1 | Allows single-pass reflow at 245 °C peak without moisture-induced failure - eliminates baking requirement in SMT lines. |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protects microcontroller power inputs from alternator load dump spikes during battery disconnect events in gasoline/diesel engines. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and LDO input; activates within nanoseconds to limit voltage to 69.4 V. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V regulators and MCU I/Os by absorbing up to 6600 W transient energy without degradation. | Use Scenario: Shields CAN transceivers and LIN drivers on 12 V supply rails from switching noise and relay-induced transients in door modules and lighting controllers. IC Role / Device Role / Timing Role: Standoff protector on main power input; blocks >43 V transients while maintaining <10 μA leakage during sleep mode. Use Value: Ensures zero-current draw in vehicle-off state and guarantees immunity to 10/1000 μs surges exceeding 1000 Vpk in EMC testing. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Safeguards image sensor and ISP power domains in front/rear-view cameras exposed to under-hood thermal and electrical stress. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V camera module input; coordinates with secondary ceramic capacitors for sub-100 ns response. Use Value: Maintains signal integrity and prevents pixel corruption during cold-crank and jump-start events due to stable 50.3 V VBR tolerance (±5 %). | Use Scenario: Protects gate drivers and current-sense amplifiers in EPS motor control boards subjected to inductive kickback from 3-phase BLDC windings. IC Role / Device Role / Timing Role: High-energy TVS on high-side supply rail; clamps 700 A IFSM-rated surges without bond wire fusing. Use Value: Eliminates need for redundant TVS devices by sustaining single-pulse 6600 W dissipation - reduces BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S43AHM3 | Same electrical specs and DO-218AB package; HM3 suffix indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified variant with identical thermal performance. | No functional difference; intended as direct replacement for HE3-series in new designs requiring updated material compliance. | Select SM8S43AHM3 for new designs where halogen-free materials and latest revision compliance are mandatory. |
| SMAJ43A | Lower PPPM (400 W vs. 6600 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), and no AEC-Q101 qualification. | Limited to non-automotive, low-energy applications; unsuitable for load dump or under-hood use due to thermal and surge limitations. | Use SMAJ43A only in cost-sensitive consumer or industrial applications with <100 W surge requirements and ambient <125 °C. |
Compared with SM8S43AHM3, the SM8S43AHE3_A/I offers identical protection performance but differs in material compliance (E3 = non-halogen-free); versus SMAJ43A, it delivers 16.5× higher surge power, 3× lower thermal resistance, and full automotive qualification - making it irreplaceable for safety-critical vehicle systems.
Availability
SM8S43AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, and electric power steering systems requiring stable component supply across extended product lifecycles.
Supply support for SM8S43AHE3_A/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 SM8SxxA family is engineered specifically for automotive load dump and ISO7637-2 transient suppression, emphasizing high-temperature operation, AEC-Q101 validation, and robust surge handling in under-hood environments.
FAQ
What is the clamping voltage of the SM8S43AHE3_A/I at its rated peak pulse current?
The SM8S43AHE3_A/I has a maximum clamping voltage (VC) of 69.4 V when subjected to its specified peak pulse current of 95.1 A under the 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number 88387, page 2) and defines the upper voltage limit imposed on protected circuitry during surge events. The SM8S43AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is the SM8S43AHE3_A/I suitable for new automotive designs despite the "Not For New Designs" note?
The "Not For New Designs" notice applies to the entire SM8SxxA series and refers to Vishay's recommendation to adopt the newer SM8SxxAHM3 family for future projects. However, the SM8S43AHE3_A/I remains fully available, AEC-Q101 qualified, and functionally identical to its HM3 counterpart - making it acceptable for new designs where legacy material compliance (E3 suffix) or existing qualification data are required. The SM8S43AHE3_A/I continues to meet all published specifications.
How does the DO-218AB package of the SM8S43AHE3_A/I improve thermal performance over standard SMA packages?
The DO-218AB package of the SM8S43AHE3_A/I integrates a metal heatsink tab directly connected to the anode, achieving a junction-to-mount thermal resistance (RθJM) of just 0.35 °C/W - over three times better than typical SMA packages (~110 °C/W). This enables effective heat transfer to the PCB copper pour or external heatsink, allowing the SM8S43AHE3_A/I to sustain high-energy transients without thermal runaway. The design is validated per JEDEC 51-14 TDIM methodology.
Does the SM8S43AHE3_A/I meet ISO7637-2 requirements out-of-the-box?
Yes, the SM8S43AHE3_A/I is explicitly rated to meet ISO7637-2 surge test requirements, as confirmed in the Vishay datasheet (page 1, FEATURES section). Its 6600 W peak pulse power rating (10/1000 μs) and 5200 W rating (10/10,000 μs) align with the standard's Pulse 5a (load dump) severity levels. System-level compliance requires proper PCB layout - including short traces, low-inductance grounding, and adequate copper area - but the SM8S43AHE3_A/I itself satisfies the core device-level requirements.
What is the maximum reverse leakage current of the SM8S43AHE3_A/I at 43 V and 175 °C?
At 43 V reverse stand-off voltage (VWM) and 175 °C junction temperature, the SM8S43AHE3_A/I exhibits a maximum reverse leakage current (ID) of 10 μA, as specified in the Electrical Characteristics table (page 2 of datasheet 88387). This ultra-low leakage ensures minimal quiescent current draw in always-on automotive modules - critical for meeting OEM battery drain budgets. The SM8S43AHE3_A/I maintains this performance across its full temperature range without degradation.
SM8S43AHE3_A/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:
- 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-218AB
SM8S43AHE3_A/I FAQ
1.How can I place an order for SM8S43AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S43AHE3_A/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 SM8S43AHE3_A/I reliable?
The price and inventory of SM8S43AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S43AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM8S43AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S43AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S43AHE3_A/I?
SM8S43AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S43AHE3_A/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 SM8S43AHE3_A/I?
For technical support, including SM8S43AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S43AHE3_A/I requirements.
6.How does Aetrix verify that SM8S43AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM8S43AHE3_A/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 SM8S43AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM8S43AHE3_A/I?
All SM8S43AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S43AHE3_A/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 SM8S43AHE3_A/I part is unused and in its original packaging.
Return procedure for SM8S43AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S43AHE3_A/I Tags
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