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Vishay General Semiconductor - Diodes Division SM5S11CAHM3/I
- Part No.:
- SM5S11CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S11CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S11CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 12.2 V minimum breakdown voltage (VBR), 11.0 V standoff voltage (VWM), 18.2 V maximum clamping voltage (VC) at 150 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). Its DO-218AC package supports high-reliability automotive applications operating up to 175 °C junction temperature.
For engineers reviewing the SM5S11CAHM3/I datasheet, SM5S11CAHM3/I pinout, SM5S11CAHM3/I application, or SM5S11CAHM3/I equivalent, this device delivers AEC-Q101 qualification, ISO 7637-2/16750-2 compliance, low leakage (<10 µA at VWM), and MSL Level 1 moisture sensitivity - critical for under-hood electronics design and production validation.
Technical Context
This TVS diode operates as a bidirectional clamping device with no polarity marking, leveraging silicon avalanche structure to limit transient overvoltages across sensitive circuit nodes. Its thermal resistance RθJA is 65 °C/W on FR4 PCB, and RθJM is 0.45 °C/W, enabling efficient heat transfer to the metal heatsink lead.
The SM5S11CAHM3/I is rated for 5 W steady-state power dissipation and supports surge waveforms per IEC 61000-4-5, ISO 7637-2 Pulse 5a/b (load dump), and ISO 16750-2. It maintains stable clamping performance from -55 °C to +175 °C, with leakage current ≤10 µA at VWM and ≤250 µA at TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 12.2 V - ensures reliable triggering above system nominal voltage (e.g., 12 V automotive), preventing false clamping during normal operation |
| VWM | 11.0 V - maximum continuous reverse voltage before significant leakage; compatible with 12 V battery systems including cold-crank margins |
| VC @ IPPM | 18.2 V at 150 A (10/1000 µs) - defines worst-case voltage seen by protected ICs during load dump transients |
| PPPM (10/1000 µs) | 3600 W - enables robust suppression of high-energy automotive load dump events without failure |
| TJ max | +175 °C - supports under-hood placement in engine control units and body control modules without derating |
| Leakage @ VWM | <10 µA at 25 °C - minimizes standby power loss in always-on vehicle networks (e.g., CAN, LIN) |
| AEC-Q101 | Qualified - meets stress test requirements for automotive-grade reliability (HTOL, TC, HTRB, etc.) |
Pinout & Package
Package: DO-218AC - surface-mount, bidirectional, metal heatsink lead (Lead 2) for enhanced thermal performance; matte tin-plated terminals compliant with J-STD-002 and JESD 22-B102; halogen-free, RoHS-compliant, and MSL Level 1 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode / Cathode (bidirectional) | No polarity marking required; symmetrical conduction path for positive/negative transients |
| Lead 2 / Metal Heatsink | Thermal & Electrical Return Path | Primary heat dissipation path to PCB copper; electrically connected to cathode side in unidirectional variants, but functionally common terminal in bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Eliminates need for polarity awareness during placement; protects against both positive and negative transients in 12 V/24 V systems |
| 175 °C junction rating | Enables direct mounting near heat sources (e.g., alternators, power converters) without external thermal derating |
| ISO 7637-2 & ISO 16750-2 compliance | Validated for automotive load dump (Pulse 5a/b) and supply voltage variation tests - reduces system-level validation effort |
| Low leakage & high surge capability | <10 µA at VWM, 3600 W (10/1000 µs) - balances low quiescent current with high transient energy handling |
| DO-218AC with metal heatsink | RθJM = 0.45 °C/W - provides superior thermal coupling vs. standard SMC/SMA packages, improving long-term reliability |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Suppresses 120 V/100 ms load dump transients generated when vehicle alternator disconnects under high battery charge conditions. IC Role / Device Role: Primary clamping element placed at ECU power input rail (BATT+), upstream of DC/DC converters and microcontrollers. Use Value: Limits rail voltage to ≤18.2 V during transients, preventing damage to 20 V-rated power management ICs and ensuring uninterrupted MCU operation. |
Use Scenario: Protects analog sensor inputs (e.g., MAP, TPS) and CAN transceiver power rails from coupled transients in engine bay wiring harnesses. IC Role / Device Role: Localized TVS at subsystem power entry point, decoupled from main BATT+ rail via ferrite bead or small inductor. Use Value: Maintains signal integrity by clamping coupled spikes to <20 V while adding <10 pF capacitance - negligible impact on 1 MHz sensor bandwidth. |
| Body Control Module (BCM) Power Rail | Start-Stop System Battery Interface |
Use Scenario: Shields BCM microcontroller I/O and power rails from switching noise and relay-induced transients in lighting, door lock, and HVAC circuits. IC Role / Device Role: Bidirectional TVS on 12 V supply input, paired with ceramic bulk capacitor for fast transient response. Use Value: Withstands repeated 3000 W surges per ISO 16750-2 Annex D, supporting 15-year vehicle lifecycle without degradation. |
Use Scenario: Guards start-stop system battery monitoring ICs and charge control MOSFET gates during cranking-induced voltage sags and rebounds. IC Role / Device Role: Clamping device on battery sense line and auxiliary 12 V rail feeding intelligent battery sensors. Use Value: Operates reliably at -40 °C to +175 °C ambient, meeting ASAM MCD-2 MC requirements for battery management accuracy under thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11CA | Lower PPPM (400 W), SMA package, RθJA ≈ 100 °C/W, not AEC-Q101 qualified | Limited to non-automotive industrial or consumer applications with lower surge energy requirements | Select only for cost-sensitive, non-automotive designs where 3600 W surge immunity is unnecessary |
| TPSMD11CA | Same DO-218AC package, 3600 W rating, but higher VC = 19.5 V at 150 A and wider VBR tolerance (±10 %) | Acceptable for less voltage-sensitive loads where 1.3 V higher clamping is tolerable | Prefer when tighter VBR tolerance (±5 %) and lower VC are required - SM5S11CAHM3/I offers superior precision clamping |
Compared with SMAJ11CA and TPSMD11CA, the SM5S11CAHM3/I delivers AEC-Q101 qualification, tighter ±5 % VBR tolerance, lower 18.2 V clamping voltage, and proven thermal performance in under-hood environments - making it the optimal choice for production automotive ECUs requiring long-term reliability.
Availability
SM5S11CAHM3/I is available at Aetrix Electronics and suitable for automotive load dump protection, engine control unit (ECU) input protection, and body control module (BCM) power rail stabilization requiring stable component supply across multi-year vehicle production cycles.
Supply support for SM5S11CAHM3/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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM5S series belongs to Vishay's PAR® (Protection Against Transients) TVS family, engineered specifically for high-energy automotive surge suppression with AEC-Q101 qualification, extended temperature operation, and DO-218AC thermal optimization.
FAQ
What is the clamping voltage of SM5S11CAHM3/I at its rated peak pulse current?
The SM5S11CAHM3/I has a maximum clamping voltage (VC) of 18.2 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 circuitry during transient events. The SM5S11CAHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +175 °C), ensuring consistent protection in demanding automotive environments.
Is SM5S11CAHM3/I suitable for use in AEC-Q101-compliant automotive designs?
Yes, SM5S11CAHM3/I is explicitly AEC-Q101 qualified, as confirmed in Vishay's ordering information table and product documentation. It undergoes rigorous stress testing including high-temperature operating life (HTOL), temperature cycling (TC), and highly accelerated stress testing (HAST) to meet automotive reliability standards. The SM5S11CAHM3/I is intended for safety-critical and mission-critical automotive applications such as engine control, battery management, and ADAS power domains.
What package type does SM5S11CAHM3/I use, and why is it preferred for automotive TVS applications?
SM5S11CAHM3/I uses the DO-218AC package - a surface-mount variant featuring an exposed metal heatsink lead (Lead 2) that provides direct thermal conduction to the PCB. This design achieves RθJM = 0.45 °C/W, significantly better than standard SMC or SMA packages. The DO-218AC also meets MSL Level 1 and supports reflow up to 245 °C peak, making SM5S11CAHM3/I ideal for high-power, high-reliability automotive surge protection where thermal management is critical.
How does SM5S11CAHM3/I compare to unidirectional TVS diodes in automotive applications?
SM5S11CAHM3/I is bidirectional, meaning it clamps both positive- and negative-going transients symmetrically without requiring polarity orientation during placement. This simplifies layout and eliminates risk of incorrect installation in 12 V systems subject to reverse battery connection or inductive kickback. Unidirectional TVS diodes require strict anode/cathode alignment and cannot suppress negative transients - making SM5S11CAHM3/I the preferred solution for general-purpose automotive power rail protection.
Does SM5S11CAHM3/I meet ISO 7637-2 and ISO 16750-2 surge test requirements?
Yes, SM5S11CAHM3/I is specified to meet both ISO 7637-2 (Pulse 5a/b for load dump) and ISO 16750-2 (electrical load conditions) surge test standards. Its 3600 W peak pulse power rating and 18.2 V clamping voltage ensure compliance with the most stringent automotive transient immunity requirements. Test validation is performed per manufacturer-defined conditions and documented in Vishay's application notes and qualification reports for the SM5S family.
SM5S11CAHM3/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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 198A
- 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
SM5S11CAHM3/I FAQ
1.How can I place an order for SM5S11CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S11CAHM3/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 SM5S11CAHM3/I reliable?
The price and inventory of SM5S11CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S11CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S11CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S11CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S11CAHM3/I?
SM5S11CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S11CAHM3/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 SM5S11CAHM3/I?
For technical support, including SM5S11CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S11CAHM3/I requirements.
6.How does Aetrix verify that SM5S11CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S11CAHM3/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 SM5S11CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S11CAHM3/I?
All SM5S11CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S11CAHM3/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 SM5S11CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S11CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S11CAHM3/I Tags
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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