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Vishay General Semiconductor - Diodes Division SM8S11CAHM3/I
- Part No.:
- SM8S11CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S11CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM8S11CAHM3/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 (min) to 13.5 V (max) breakdown voltage (VBR), 11.0 V stand-off voltage (VWM), and clamps transients up to 18.2 V at 150 A peak pulse current (IPPM) under 10/1000 µs waveform - enabling robust protection of 12 V automotive electronics against ISO 7637-2 and ISO 16750-2 surges.
For engineers reviewing the SM8S11CAHM3/I datasheet, SM8S11CAHM3/I pinout, SM8S11CAHM3/I application, or SM8S11CAHM3/I equivalent, this device is evaluated for high-reliability 12 V power rail protection in engine control units, body control modules, and ADAS sensors where AEC-Q101 qualification, TJ = 175 °C operation, and DO-218AC thermal performance are critical selection criteria.
Technical Context
This TVS diode operates as a voltage-clamping overvoltage protection device across power rails, triggered when reverse voltage exceeds its specified VBR. Its bidirectional architecture enables symmetrical clamping without polarity sensitivity, eliminating cathode band marking and simplifying PCB layout in DC systems subject to bipolar transients.
Engineered for automotive-grade reliability, the SM8S11CAHM3/I delivers 6600 W peak pulse power (10/1000 µs), 5000 W (10/10,000 µs), and maintains low leakage (<10 µA at VWM, <15 µA at TJ = 175 °C) while sustaining junction temperatures up to +175 °C - validated per AEC-Q101 and MSL Level 1 (245 °C reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min–max) | 12.2 V to 13.5 V - ensures reliable triggering above nominal 12 V rail while accommodating manufacturing tolerance |
| VWM | 11.0 V - maximum continuous reverse voltage before leakage rises significantly; compatible with 12 V system nominal range |
| VC @ IPPM | 18.2 V at 150 A - clamping voltage limits downstream IC stress during load dump events (ISO 7637-2 Pulse 5a) |
| PPPM (10/1000 µs) | 6600 W - sustains high-energy transients typical of alternator load dump without failure |
| TJ max | +175 °C - supports under-hood placement in modern automotive ECUs without derating |
| Leakage @ VWM, 25 °C | <10 µA - minimizes quiescent power loss in always-on vehicle networks (e.g., CAN standby) |
| Package | DO-218AC - thermally optimized surface-mount case with metal heatsink terminal for low RθJM = 0.35 °C/W |
Pinout & Package
DO-218AC package with two terminals: Lead 1 (anode/cathode indeterminate due to bidirectionality) and Lead 2 / Metal Heatsink (common thermal path). No polarity marking; symmetric construction enables orientation-agnostic placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode/Cathode (bidirectional) | Electrically interchangeable terminal; connects to protected line or ground depending on circuit topology |
| Lead 2 / Metal Heatsink | Thermal & Electrical Return | Primary heat dissipation path to PCB copper; electrically common to both terminals in clamping state |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity, and mechanical shock per JESD22 standards |
| MSL Level 1 (245 °C) | Compatible with standard lead-free reflow profiles without popcorn or delamination risk |
| RoHS-compliant, halogen-free (M3) | Meets global environmental regulations and eliminates corrosive halogen emissions during soldering or field failure |
| Low RθJM = 0.35 °C/W | Enables efficient heat transfer from junction to PCB heatsink pad, supporting sustained surge duty cycles |
| Bidirectional, no cathode band | Eliminates orientation errors during automated placement and reduces BOM complexity vs. unidirectional variants |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Supply Rail |
|---|---|
Use Scenario: Protects ECU 12 V input against alternator load dump surges (ISO 7637-2 Pulse 5a) and inductive switching spikes from fuel injectors or solenoids. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to limit transient amplitude before LDOs or microcontrollers. Use Value: Clamps to 18.2 V at 150 A, preventing damage to downstream 3.3 V/5 V logic and ensuring ASIL-B functional safety compliance. |
Use Scenario: Shields BCM power supply from battery disconnection/reconnection transients and relay coil flyback in lighting and door lock circuits. IC Role / Device Role / Timing Role: Primary overvoltage suppression element mounted adjacent to fuse box interface, operating continuously at ambient up to +105 °C. Use Value: Maintains <10 µA leakage at 11 V and survives 175 °C junction temperature, enabling compact, sealed-module designs. |
| ADAS Camera Power Interface | Infotainment Head Unit DC-DC Input |
Use Scenario: Guards front-facing camera module power line against ESD and load dump in ADAS domain controllers exposed to harsh under-hood environments. IC Role / Device Role / Timing Role: Fast-response clamping device placed upstream of buck converter, activated within nanoseconds of overvoltage onset. Use Value: Delivers 6600 W peak power handling with minimal capacitance, avoiding signal integrity degradation on high-speed video links. |
Use Scenario: Secures infotainment head unit main 12 V input against jump-start surges and battery polarity reversal protection circuit interactions. IC Role / Device Role / Timing Role: Bidirectional TVS used in conjunction with reverse-polarity MOSFETs to absorb energy during fault conditions without polarity dependency. Use Value: Eliminates need for separate anode/cathode routing; DO-218AC metal heatsink enables direct thermal coupling to chassis ground plane. |
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), DO-214AC package, RθJA = 95 °C/W vs. 55 °C/W | Suitable only for low-energy transients (e.g., ESD); not rated for ISO 7637-2 load dump | Select SMAJ11CA only for cost-sensitive non-automotive applications with <500 W surge requirements. |
| TPSMD11CA | Same VBR/VWM, but lower IPPM (100 A) and VC (19.5 V); AEC-Q101 qualified, DO-218AC | Marginally higher clamping voltage reduces protection margin for sensitive 5 V peripherals | TPSMD11CA is viable where board space allows identical footprint but system-level testing confirms 19.5 V clamping is acceptable. |
Compared with SMAJ11CA and TPSMD11CA, the SM8S11CAHM3/I provides 16.5× higher peak pulse power and superior thermal resistance - making it the only option among the three qualified for full automotive load dump protection per ISO 7637-2.
Availability
SM8S11CAHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera systems requiring stable component supply with AEC-Q101 traceability and long-term production continuity.
Supply support for SM8S11CAHM3/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 SM8SxxCA family was engineered specifically for automotive-grade transient suppression, emphasizing high-temperature stability (TJ = 175 °C), ISO 7637-2 compliance, and DO-218AC thermal performance in under-hood environments.
FAQ
What is the maximum clamping voltage of the SM8S11CAHM3/I at its rated peak pulse current?
The SM8S11CAHM3/I has a maximum clamping voltage (VC) of 18.2 V at its rated peak pulse current of 150 A under the 10/1000 µs waveform. This value is measured per Figure 4 in the Vishay datasheet (Doc. #98229) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring compatibility with 24 V tolerant or 5 V logic interfaces downstream of the SM8S11CAHM3/I.
Is the SM8S11CAHM3/I suitable for 24 V automotive systems?
No - the SM8S11CAHM3/I is specified for 12 V nominal systems, with a 11.0 V stand-off voltage (VWM) and 12.2–13.5 V breakdown range. For 24 V systems, Vishay specifies higher-voltage variants such as SM8S24CA (VWM = 24.0 V) or SM8S26CA. Using SM8S11CAHM3/I on a 24 V rail would cause continuous conduction and thermal failure due to exceeding VWM by >100 %.
Does the SM8S11CAHM3/I require a heatsink on the PCB?
The SM8S11CAHM3/I uses a DO-218AC package with an integrated metal heatsink terminal (Lead 2), which must be connected to a minimum 100 mm² copper pour per Vishay's recommended pad layout. This PCB copper acts as the primary heatsink - no external heatsink is needed. The low junction-to-mount thermal resistance (RθJM = 0.35 °C/W) relies entirely on proper PCB thermal design, not component-level heatsinking.
How does the HM3 suffix impact the SM8S11CAHM3/I's compliance profile?
"HM3" denotes halogen-free, RoHS-compliant construction with matte tin-plated leads and JESD201 Class 2 whisker resistance. It also signifies AEC-Q101 qualification (H) and material compliance per Vishay Doc. #99912. This suffix distinguishes SM8S11CAHM3/I from non-automotive variants (e.g., SM8S11CAHE3) and ensures suitability for automotive production where regulatory and reliability requirements are mandatory.
Can the SM8S11CAHM3/I replace a unidirectional TVS in an existing design?
Yes - the SM8S11CAHM3/I is bidirectional and can replace unidirectional TVS diodes in DC applications where polarity is fixed, provided layout accommodates its DO-218AC footprint and thermal pad. However, its symmetrical clamping means it will conduct on both positive and negative transients, unlike unidirectional devices that only clamp in one direction - verify system behavior during negative-going surges before substitution.
SM8S11CAHM3/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):
- 363A
- 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
SM8S11CAHM3/I FAQ
1.How can I place an order for SM8S11CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S11CAHM3/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 SM8S11CAHM3/I reliable?
The price and inventory of SM8S11CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S11CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S11CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S11CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S11CAHM3/I?
SM8S11CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S11CAHM3/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 SM8S11CAHM3/I?
For technical support, including SM8S11CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S11CAHM3/I requirements.
6.How does Aetrix verify that SM8S11CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S11CAHM3/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 SM8S11CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S11CAHM3/I?
All SM8S11CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S11CAHM3/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 SM8S11CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S11CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S11CAHM3/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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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