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Vishay General Semiconductor - Diodes Division SM8S17CAHM3/I
- Part No.:
- SM8S17CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S17CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,070
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Product details
Overview
SM8S17CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 17 V standoff voltage (VWM), 18.9–20.9 V breakdown voltage (VBR), 27.6 V clamping voltage at 239 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). Rated for TJ = 175 °C and AEC-Q101 qualified, it operates in DO-218AC package for high-reliability engine control and powertrain modules.
For engineers reviewing the SM8S17CAHM3/I datasheet, SM8S17CAHM3/I pinout, SM8S17CAHM3/I application, or SM8S17CAHM3/I equivalent, key selection criteria include clamping performance under ISO 7637-2 load dump pulses, thermal resistance (RθJA = 55 °C/W), bidirectional surge handling up to 239 A, and compatibility with halogen-free, lead-free PCB assembly per JESD 201 Class 2 whisker test.
Technical Context
This TVS diode uses silicon avalanche junction technology to provide fast-response overvoltage clamping during automotive transients such as load dump and inductive switching spikes. Its bidirectional structure enables symmetrical clamping without polarity sensitivity, eliminating need for cathode band marking.
Designed for direct mounting on FR4 PCBs with standard footprint per IPC 7351, it achieves low thermal resistance to heatsink (RθJM = 0.35 °C/W) via metal heatsink terminal (Lead 2), enabling sustained 8.0 W power dissipation at TA = 25 °C and full derating up to TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.0 V - Maximum reverse stand-off voltage before conduction; defines operating window for protected circuitry |
| VBR (min/max) | 18.9 V / 20.9 V - Breakdown occurs within this range at 5 mA test current; ensures consistent turn-on threshold |
| VC @ IPPM | 27.6 V at 239 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capability; supports ISO 7637-2 Pulse 5a load dump immunity |
| TJ max | +175 °C - Maximum junction temperature rating; enables use in under-hood automotive environments |
| Leakage @ VWM | 10 μA at 25 °C - Low reverse leakage preserves battery drain budget in always-on vehicle systems |
| Package | DO-218AC - Surface-mount package with metal heatsink terminal (Lead 2); optimized for thermal transfer and high-current surge routing |
Pinout & Package
DO-218AC package features two terminals: Lead 1 (anode/cathode indeterminate due to bidirectionality) and Lead 2 (metal heatsink pad). The device has no polarity marking; both terminals function identically in surge conduction path. Thermal performance relies on soldering Lead 2 to a large copper pour acting as heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode/Cathode (bidirectional) | Primary surge current path terminal; symmetric conduction enables placement without orientation check |
| Lead 2 | Metal Heatsink Terminal | Low-thermal-resistance path to PCB copper; must be connected to ≥100 mm² thermal pad for rated RθJM = 0.35 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental regulations and JESD 201 Class 2 whisker resistance for long-term solder joint integrity |
| ISO 7637-2 & ISO 16750-2 compliance | Tested to withstand load dump (Pulse 5a) and supply voltage variation transients common in 12 V vehicle electrical systems |
| MSL Level 1 (245 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements |
| Bidirectional operation | Eliminates polarity-dependent layout constraints and reduces BOM count in differential or AC-coupled protection schemes |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of engine ECU against alternator load dump surges up to 35 V for 400 ms. IC Role / Device Role / Timing Role: Primary clamping device placed directly at power entry point before DC/DC converter input. Use Value: Limits voltage to ≤27.6 V during 239 A transient, preventing damage to downstream LDOs and microcontrollers rated for 30 V absolute maximum. |
Use Scenario: Shields high-speed CAN FD transceivers from coupled transients induced by nearby solenoid switching in door modules. IC Role / Device Role / Timing Role: Common-mode TVS across CANH/CANL lines, leveraging bidirectional symmetry for signal integrity preservation. Use Value: Clamps common-mode spikes within 1 ns response time while maintaining <10 μA leakage at 12 V, avoiding bus bias disruption. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Secures 5 V/3.3 V imaging sensor power rails in rear-view cameras exposed to ignition noise and jump-start events. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary DC/DC filter, targeting residual fast transients missed by bulk capacitance. Use Value: Delivers 27.6 V clamping at 239 A with <1 ns response, ensuring sensor ICs remain within safe operating area during 10/1000 μs spikes. |
Use Scenario: Protects gate drivers and current sense amplifiers in EPS motor control boards subjected to inductive kickback from 3-phase BLDC commutation. IC Role / Device Role / Timing Role: High-power TVS across motor phase-to-ground paths, using DO-218AC metal heatsink for thermal management. Use Value: Handles repetitive 5000 W (10/10,000 μs) surges without degradation, supporting >100,000-cycle EPS durability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CA | Lower PPPM (400 W vs. 6600 W); SMA package (RθJA = 110 °C/W); VBR = 18.9–20.9 V same | Not suitable for load dump; limited to low-energy ESD and inductive spikes in non-automotive consumer gear | Select only for cost-sensitive, low-surge industrial controls where ISO 7637-2 compliance is not required |
| TPSMD17CA | Same DO-218AC package; identical VWM/VBR/VC specs; lower TJ max (150 °C vs. 175 °C); not AEC-Q101 qualified | Lacks automotive qualification and high-temperature endurance; unsuitable for under-hood deployment | Acceptable for commercial-temperature automotive infotainment or ADAS subsystems outside engine bay |
Compared with SMAJ17CA and TPSMD17CA, the SM8S17CAHM3/I uniquely combines 6600 W surge capacity, AEC-Q101 qualification, and 175 °C operation-making it the only option validated for front-end 12 V power protection in engine control units and EPS systems requiring full ISO 7637-2 Pulse 5a immunity.
Availability
SM8S17CAHM3/I is available at Aetrix Electronics and suitable for automotive power electronics, engine control units, and body control modules requiring stable component supply with guaranteed AEC-Q101 compliance and long-lifecycle support.
Supply support for SM8S17CAHM3/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 is engineered specifically for automotive-grade transient suppression, emphasizing high-temperature stability, ISO-standard surge immunity, and robust packaging for under-hood deployment.
FAQ
What is the clamping voltage of SM8S17CAHM3/I at its rated peak pulse current?
The SM8S17CAHM3/I exhibits a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current (IPPM) of 239 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 transients. Maintaining VC below downstream IC absolute maximum ratings is critical for system-level surge survivability.
Is SM8S17CAHM3/I suitable for protecting CAN FD interfaces?
Yes, SM8S17CAHM3/I is suitable for CAN FD interface protection when applied differentially across CANH–CANL or common-mode across both lines to ground. Its bidirectional nature preserves signal symmetry, 27.6 V clamping avoids violating CAN FD transceiver common-mode range (±30 V), and sub-nanosecond response prevents data corruption. However, ensure layout minimizes parasitic inductance to maintain clamping speed, and verify total capacitance does not exceed transceiver specification (typically <100 pF).
Does SM8S17CAHM3/I require a heatsink on the PCB?
SM8S17CAHM3/I requires a dedicated thermal pad connected to Lead 2 (metal heatsink terminal) on the PCB-this functions as its integral heatsink. Per JEDEC 51-14, achieving the specified RθJM = 0.35 °C/W demands ≥100 mm² of 2 oz. copper connected directly to Lead 2. Without this, thermal resistance rises sharply, limiting continuous power dissipation and risking junction overheating during repetitive surges or elevated ambient temperatures.
What automotive standards does SM8S17CAHM3/I meet?
SM8S17CAHM3/I meets ISO 7637-2 (Pulse 5a load dump) and ISO 16750-2 (supply voltage transients) when tested per defined conditions in the Vishay datasheet. It is also AEC-Q101 qualified for stress tests including HTGB, H3TRB, and temperature cycling. Compliance is verified per test plan in Doc. #98229, with no derating needed for standard 12 V automotive applications operating up to TJ = 175 °C.
How does the HM3 suffix affect SM8S17CAHM3/I's manufacturing compliance?
The HM3 suffix on SM8S17CAHM3/I denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 201 Class 2 whisker resistance. "H" confirms AEC-Q101 qualification, "M3" specifies material compliance, and "/I" indicates 13-inch tape-and-reel packaging with anode orientation toward sprocket hole. This suffix ensures full alignment with automotive Tier 1 sourcing requirements and lead-free assembly processes.
SM8S17CAHM3/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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 239A
- 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
SM8S17CAHM3/I FAQ
1.How can I place an order for SM8S17CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S17CAHM3/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 SM8S17CAHM3/I reliable?
The price and inventory of SM8S17CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S17CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S17CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S17CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S17CAHM3/I?
SM8S17CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S17CAHM3/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 SM8S17CAHM3/I?
For technical support, including SM8S17CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S17CAHM3/I requirements.
6.How does Aetrix verify that SM8S17CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S17CAHM3/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 SM8S17CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S17CAHM3/I?
All SM8S17CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S17CAHM3/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 SM8S17CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S17CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S17CAHM3/I Tags
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DESD3V3E1BL-7B
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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