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Vishay General Semiconductor - Diodes Division SM5S43CAHM3/I
- Part No.:
- SM5S43CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S43CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S43CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 43.0 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), 69.4 V maximum clamping voltage (VC) at 150 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). Rated for TJ = −55 °C to +175 °C and AEC-Q101 qualified, it operates in DO-218AC package with halogen-free, RoHS-compliant construction.
For engineers reviewing the SM5S43CAHM3/I datasheet, SM5S43CAHM3/I pinout, SM5S43CAHM3/I application, or SM5S43CAHM3/I equivalent, key selection criteria include clamping performance under ISO 7637-2 load dump transients, thermal stability at 175 °C junction temperature, bidirectional surge handling capability, and compatibility with automotive-grade PCB assembly per JESD 201 Class 2 whisker testing.
Technical Context
This TVS diode employs a silicon avalanche structure optimized for high-energy transient suppression in 12 V and 24 V automotive electrical systems. Its DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.45 °C/W) and supports high surge currents without degradation under repeated load dump events.
The device meets ISO 7637-2 (pulse 5a) and ISO 16750-2 surge requirements when applied with appropriate layout and trace impedance. Bidirectional polarity eliminates cathode band marking, simplifying board placement while maintaining symmetrical clamping behavior for both positive and negative transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43.0 V - reverse stand-off voltage; defines maximum continuous operating voltage before significant leakage begins |
| VBR min/max | 47.8 V / 52.8 V - breakdown voltage range at 5 mA test current; ensures consistent turn-on across production lots |
| VC @ IPPM | 69.4 V at 150 A (10/1000 µs) - clamping voltage limiting downstream circuit stress during worst-case surge |
| PPPM (10/1000 µs) | 3600 W - peak pulse power handling capacity; enables robust protection against automotive load dump spikes |
| TJ max | +175 °C - maximum junction temperature rating; supports operation in engine bay and powertrain environments |
| Package | DO-218AC - surface-mount package with integrated metal heatsink terminal for enhanced thermal dissipation |
| AEC-Q101 | Qualified - certified for automotive electronic components per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
SM5S43CAHM3/I uses the DO-218AC package: a surface-mount, bidirectional TVS diode with two terminals - Terminal 1 (anode-side lead) and Terminal 2 (metal heatsink/cathode-side thermal pad). The package has no polarity marking; bidirectional operation means either terminal may serve as anode or cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode-side lead | Solderable matte tin-plated lead; connects to PCB trace; forms one side of the avalanche junction |
| Terminal 2 | Metal heatsink / cathode-side thermal pad | Large-area metal pad for thermal conduction to PCB copper; serves as second terminal and primary heat path (RθJM = 0.45 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or dual-polarity DC lines without orientation constraints |
| 175 °C junction rating | Supports under-hood deployment in modern automotive ECUs where ambient temperatures exceed 125 °C |
| ISO 7637-2 compliance | Validated for Pulse 5a (load dump) up to 35 V superimposed on 14 V system, enabling direct integration into power supply inputs |
| MSL Level 1 | Allows unlimited floor life and reflow at 245 °C peak, compatible with standard SMT assembly processes |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, critical for long-term reliability in automotive applications |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting 12 V supply rail from alternator load dump transients during battery disconnection. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC/DC converters and microcontroller power regulators. Use Value: Limits input voltage to ≤69.4 V during 35 V/150 A load dump event, preventing damage to downstream LDOs and MCU power domains. |
Use Scenario: Safeguarding ECU main power input against ISO 16750-2 jump-start and cranking surges. IC Role / Device Role / Timing Role: Fast-response shunt protector responding within nanoseconds to suppress >200 V spikes. Use Value: Maintains <15 μA leakage at 43 V, minimizing quiescent current impact on always-on ECU circuits. |
| ADAS Camera Power Interface | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Shielding MIPI or FPD-Link III camera power lines from coupled transients induced by nearby solenoid switching. IC Role / Device Role / Timing Role: Localized TVS adjacent to connector entry point to minimize inductive loop area. Use Value: 69.4 V clamping ensures image sensor and serializer ICs remain within absolute maximum ratings during 10/1000 µs surges. |
Use Scenario: Protecting H-bridge gate driver supplies from inductive kickback during motor phase commutation. IC Role / Device Role / Timing Role: High-power transient absorber mounted directly on motor driver PCB near power input terminals. Use Value: 3600 W peak power rating sustains multiple 10/1000 µs surges without parametric shift or thermal runaway. |
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. 3600 W); SMA package (RθJA ≈ 110 °C/W vs. 65 °C/W); same VWM/VBR range | Not suitable for load dump; limited to low-energy ESD and inductive switching transients | Select SMAJ43CA only for non-automotive, low-surge industrial I/O protection where space is constrained |
| TPSMD43CA | Same DO-218AC package and 3600 W rating; tighter VBR tolerance (±3.5 % vs. ±5 %); higher VC (71.4 V) | Acceptable for load dump but requires margin check on downstream component abs max ratings due to higher clamping | Choose TPSMD43CA when tighter breakdown consistency is required and clamping voltage margin allows 71.4 V |
Compared with SMAJ43CA and TPSMD43CA, SM5S43CAHM3/I delivers optimal balance of high-energy surge capability, automotive qualification, and thermal performance in the DO-218AC footprint-making it the preferred choice for load dump protection where both energy handling and long-term reliability are critical.
Availability
SM5S43CAHM3/I is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, ADAS camera interfaces, and electric power steering systems requiring stable component supply across extended product lifecycles.
Supply support for SM5S43CAHM3/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, MOSFETs, and protection devices engineered for high reliability and harsh-environment operation.
The SM5SxxCA family is designed specifically for automotive-grade transient suppression, emphasizing AEC-Q101 qualification, 175 °C operation, and compliance with ISO 7637-2 and ISO 16750-2 standards.
FAQ
What is the clamping voltage of SM5S43CAHM3/I at its rated peak pulse current?
The SM5S43CAHM3/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 is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The clamping performance is guaranteed across the full operating temperature range and is integral to meeting ISO 7637-2 load dump requirements.
Is SM5S43CAHM3/I suitable for 24 V automotive systems?
Yes, SM5S43CAHM3/I is suitable for 24 V automotive systems. Its 43.0 V stand-off voltage provides adequate margin above nominal 24 V rail (typically up to 28 V during charging), while its 69.4 V clamping voltage remains within safe limits for most 24 V-rated downstream components. It is explicitly validated for ISO 7637-2 and ISO 16750-2 compliance in both 12 V and 24 V architectures.
Does SM5S43CAHM3/I require a heatsink on the PCB?
No external heatsink is required for SM5S43CAHM3/I, as its DO-218AC package incorporates a metal heatsink terminal (Terminal 2) that must be soldered to a minimum 100 mm² copper pour on the PCB. This internal thermal path achieves RθJM = 0.45 °C/W, enabling full 3600 W surge capability without auxiliary cooling. Standard FR-4 layout per IPC-7351 is sufficient.
What does the "HM3" suffix indicate in SM5S43CAHM3/I?
The "HM3" suffix in SM5S43CAHM3/I denotes three critical qualifications: H = AEC-Q101 qualified, M3 = halogen-free, RoHS-compliant, and Pb-free termination. The "I" indicates packaging in 13-inch plastic tape and reel with anode oriented toward sprocket holes. This suffix confirms full automotive-grade material and process compliance per Vishay's ordering nomenclature.
How does SM5S43CAHM3/I differ from SM5S43A (unidirectional)?
SM5S43CAHM3/I is bidirectional (CA), while SM5S43A is unidirectional (A). The CA version suppresses transients of either polarity and has no cathode band; the A version protects only against positive surges relative to ground and requires correct orientation. Clamping characteristics, power rating, and package are identical-but circuit topology and layout rules differ significantly between the two variants.
SM5S43CAHM3/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):
- 51.9A
- 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-218AB
SM5S43CAHM3/I FAQ
1.How can I place an order for SM5S43CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S43CAHM3/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 SM5S43CAHM3/I reliable?
The price and inventory of SM5S43CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S43CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S43CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S43CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S43CAHM3/I?
SM5S43CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S43CAHM3/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 SM5S43CAHM3/I?
For technical support, including SM5S43CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S43CAHM3/I requirements.
6.How does Aetrix verify that SM5S43CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S43CAHM3/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 SM5S43CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S43CAHM3/I?
All SM5S43CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S43CAHM3/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 SM5S43CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S43CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S43CAHM3/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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