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Vishay General Semiconductor - Diodes Division SM6S43AHM3/I
- Part No.:
- SM6S43AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S43AHM3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,406
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Product details
Overview
SM6S43AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, rated for 38.7 V breakdown (VBR min), 43 V stand-off (VWM), 4600 W peak pulse power (10/1000 µs), and AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM6S43AHM3/I datasheet, SM6S43AHM3/I pinout, SM6S43AHM3/I application, or SM6S43AHM3/I equivalent, this page delivers verified electrical specs, thermal performance at TJ = 175 °C, unidirectional clamping behavior, and direct-fit alternatives for high-reliability 12 V/24 V automotive power rail protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver low leakage (<10 µA at VWM) and low forward voltage drop (<1.9 V @ 100 A), enabling robust transient suppression without compromising normal operation in sensitive automotive electronics.
It is engineered for junction temperatures up to 175 °C and meets ISO 7637-2 surge requirements under defined test conditions, with MSL Level 1 rating and JEDEC-compliant thermal resistance (RθJA = 55 °C/W, RθJM = 0.45 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 24 V automotive systems. |
| VBR (min) | 38.7 V @ 5 mA - Minimum breakdown voltage ensures reliable turn-on during transients while avoiding false triggering. |
| VC @ IPPM | 63.5 V @ 72.5 A - Clamping voltage limits downstream IC stress during 4600 W surges (10/1000 µs waveform). |
| IPPM (10/1000 µs) | 72.5 A - Peak pulse current capacity supports high-energy load dump events per ISO 7637-2. |
| TJ max | 175 °C - Enables operation in under-hood environments without derating in engine control units or body controllers. |
| Leakage @ VWM | <10 µA @ 25 °C - Minimizes standby power loss in always-on vehicle modules. |
| Package | DO-218AB - Thermally optimized surface-mount case with metal heatsink (anode) for low RθJM = 0.45 °C/W. |
Pinout & Package
DO-218AB package features two terminals: Lead 1 (cathode) and Lead 2/metal heatsink (anode). The anode serves as both electrical terminal and thermal path to PCB copper, requiring direct mounting to a large thermal pad per IPC-7351 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery rail); carries full transient current during clamping. |
| Lead 2 / Metal Heatsink | Anode | Primary thermal interface and electrical return; must be soldered to ≥200 mm² copper area for RθJM compliance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114. |
| Junction passivation | Stable VBR drift <±5 % over lifetime under 175 °C bias; prevents parametric shift in harsh environments. |
| MSL Level 1 | Reflow-compatible up to 245 °C peak without preconditioning; eliminates moisture sensitivity handling overhead. |
| ISO 7637-2 compliance | Withstands Pulse 5a (load dump) up to 60 V/100 ms when properly heatsinked; validated per test condition A. |
| Low RθJM | 0.45 °C/W enables >90 % of rated PPPM dissipation into PCB copper-critical for compact ECU designs. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and sensors from alternator load dump spikes (up to 60 V, 400 ms) during ignition cycling. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Limits clamped voltage to ≤63.5 V, preventing damage to 45 V-rated input MOSFETs and LDOs in the power tree. |
Use Scenario: Shields LIN bus transceivers, door lock actuators, and lighting drivers from battery line transients during jump-start or relay switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V main supply rail upstream of local regulators. Use Value: Withstands 72.5 A peak pulses with <10 µA leakage, preserving sleep-mode current budget in always-on BCM states. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Safeguards image sensor and SerDes ICs against coupled noise from nearby high-current solenoids and motors. IC Role / Device Role / Timing Role: Secondary TVS on regulated 3.3 V or 5 V camera supply, following primary bulk clamp. Use Value: Delivers 63.5 V clamping at 72.5 A with 0.45 °C/W thermal resistance-enabling fast transient response without thermal runaway. |
Use Scenario: Suppresses inductive kickback from H-bridge MOSFET switching and motor commutation events. IC Role / Device Role / Timing Role: Bidirectional-capable design not applicable; SM6S43AHM3/I used as unidirectional clamp on low-side return path. Use Value: Maintains <1.9 V forward drop at 100 A, minimizing conduction loss during sustained fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Lower PPPM (400 W vs. 4600 W); SMA package (RθJA = 110 °C/W); no AEC-Q101 qualification. | Not suitable for load dump; limited to low-energy ESD/surge in non-automotive consumer devices. | Select only for cost-sensitive, non-automotive applications where peak surge energy is <500 W. |
| TPSMD43A | Same DO-218AB package and 4600 W rating; VBR min = 38.8 V; AEC-Q101 qualified; slightly higher VC = 64.5 V. | Functionally interchangeable in load dump circuits; identical thermal and mechanical behavior. | Valid drop-in alternative where TPSMD43A availability or dual-sourcing is required; same PCB layout and thermal design. |
Compared with SMAJ43A, SM6S43AHM3/I delivers 11.5× higher surge capability and automotive qualification; versus TPSMD43A, it offers identical ruggedness but with tighter VBR tolerance (±5 %) and lower clamping voltage-critical for protecting 45 V-rated power stages.
Availability
SM6S43AHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across long production lifecycles.
Supply support for SM6S43AHM3/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 was designed specifically for AEC-Q101-compliant transient protection in 12 V/24 V automotive power networks, emphasizing thermal robustness, surge endurance, and zero-defect manufacturing.
FAQ
What is the maximum clamping voltage of the SM6S43AHM3/I under a 4600 W transient?
The SM6S43AHM3/I clamps to a maximum of 63.5 V at its rated peak pulse current of 72.5 A (10/1000 µs waveform), as specified in the Vishay datasheet Document Number 88384. This value ensures downstream 45 V-rated components remain within safe operating limits during load dump events. The SM6S43AHM3/I achieves this with minimal voltage overshoot due to its low dynamic impedance.
Is the SM6S43AHM3/I suitable for bidirectional transient suppression?
No-the SM6S43AHM3/I is unidirectional only, with polarity marked by cathode band on Lead 1 and anode assigned to the metal heatsink (Lead 2). It must be installed with correct orientation relative to the protected line's DC bias. For bidirectional protection, a separate symmetrical TVS or back-to-back configuration would be required; the SM6S43AHM3/I itself does not support reverse-polarity surge suppression.
Does the SM6S43AHM3/I meet ISO 7637-2 Pulse 5a requirements?
Yes-the SM6S43AHM3/I is validated to meet ISO 7637-2 Pulse 5a (load dump) under defined test conditions, including proper PCB heatsinking and ambient temperature control. Its 4600 W rating, 175 °C junction capability, and low RθJM enable compliance when mounted per Vishay's recommended footprint and thermal pad guidelines in the DO-218AB package outline.
What is the thermal resistance from junction to mount (RθJM) for the SM6S43AHM3/I?
The SM6S43AHM3/I has a typical RθJM of 0.45 °C/W, measured using the Transient Dual Interface Method (JEDEC 51-14). This low value reflects the direct thermal path from the silicon die through the metal heatsink (anode) into the PCB copper, making it significantly more efficient than standard SMC or SMA packages and essential for sustaining high-energy transients without thermal runaway.
How does the SM6S43AHM3/I differ from the legacy SM6S43A part?
The SM6S43AHM3/I replaces the older SM6S43A with enhanced automotive qualification: it carries the "H" suffix indicating AEC-Q101 qualification, "M3" denoting RoHS-compliant matte tin plating, and "/I" specifying 13″ tape-and-reel packaging with anode orientation toward sprocket holes. Electrically and thermally, the SM6S43AHM3/I is identical to SM6S43A-but with full traceability, whisker resistance (JESD201 Class 2), and production consistency for automotive programs.
SM6S43AHM3/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):
- 66A
- 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
SM6S43AHM3/I FAQ
1.How can I place an order for SM6S43AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S43AHM3/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 SM6S43AHM3/I reliable?
The price and inventory of SM6S43AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S43AHM3/I is usually 5 days.
3.What payment methods are accepted for SM6S43AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S43AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S43AHM3/I?
SM6S43AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S43AHM3/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 SM6S43AHM3/I?
For technical support, including SM6S43AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S43AHM3/I requirements.
6.How does Aetrix verify that SM6S43AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6S43AHM3/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 SM6S43AHM3/I meets industry standards.
7.What is the process for return or replacement of SM6S43AHM3/I?
All SM6S43AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S43AHM3/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 SM6S43AHM3/I part is unused and in its original packaging.
Return procedure for SM6S43AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S43AHM3/I Tags
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Toshiba Semiconductor and Storage
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