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Vishay General Semiconductor - Diodes Division SM8S17AHM3/I
- Part No.:
- SM8S17AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S17AHM3/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,202
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Product details
Overview
SM8S17AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 17 V stand-off voltage (VWM), 19.9 V minimum breakdown voltage (VBR), and 6600 W peak pulse power (10/1000 μs). It delivers AEC-Q101 qualification, 175 °C junction temperature capability, and low leakage (<10 μA at VWM), targeting automotive load dump protection.
For engineers reviewing the SM8S17AHM3/I datasheet, SM8S17AHM3/I pinout, SM8S17AHM3/I application, or SM8S17AHM3/I equivalent, this page provides verified electrical parameters, thermal resistance (RθJM = 0.35 °C/W), clamping behavior (VC = 27.6 V at IPPM), polarity configuration (anode-heatsink), and direct alternative part guidance aligned with Vishay's official replacement notice.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and surge robustness. Its unidirectional structure enables asymmetric clamping-low forward voltage drop (≤1.8 V at 100 A) and precise reverse standoff-making it suitable for DC bus protection where polarity is fixed and reverse conduction must be blocked.
Designed to meet ISO7637-2 load dump waveforms, the SM8S17AHM3/I sustains 700 A peak forward surge current (IFSM, 8.3 ms half-sine) and exhibits a positive temperature coefficient of VBR (αT = 0.082 %/°C), ensuring predictable voltage shift across its -55 °C to +175 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; defines system DC bus rating compatibility. |
| VBR (min) | 18.9 V - Minimum breakdown voltage at 5 mA test current; ensures reliable triggering above normal transients. |
| VC @ IPPM | 27.6 V - Clamping voltage at 239 A (10/1000 μs); limits downstream voltage stress during surge events. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling; supports high-energy automotive load dump surges per ISO7637-2. |
| TJ max | +175 °C - Maximum junction temperature; enables under-hood deployment without derating in engine control units. |
| RθJM | 0.35 °C/W - Junction-to-mount thermal resistance; confirms efficient heat transfer to heatsink or PCB copper pour. |
| ID @ VWM | <10 μA - Reverse leakage at 17 V; minimizes standby power loss in always-on vehicle modules. |
Pinout & Package
Package: DO-218AB - molded surface-mount case with integral metal heatsink; anode terminal connected to heatsink tab; cathode on lead 1; meets UL 94 V-0 and JESD201 Class 2 whisker requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (cathode) | Clamping output node | Connected to protected line (e.g., 12 V rail); conducts surge current to anode/heatsink when V > VBR. |
| Metal heatsink (anode) | Return path / thermal interface | Electrically and thermally tied to system ground; requires direct solder connection to large copper area for RθJM = 0.35 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; required for powertrain and body control modules. |
| Junction passivation | Stable VBR over lifetime and humidity exposure; eliminates parameter drift in high-humidity under-hood environments. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60 % RH; no baking required prior to reflow, simplifying SMT assembly. |
| Low VF (≤1.8 V) | Minimizes conduction loss during forward surge events (e.g., reverse battery connection), reducing I²R heating in clamp path. |
| ISO7637-2 compliance | Validated against Pulse 5a (load dump) waveform; guarantees protection margin for 12 V automotive systems. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Power Rail |
|---|---|
Use Scenario: Protects 12 V supply input of engine ECU against alternator load dump surges up to 35 V for 400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS clamps excess energy to ground via heatsink while maintaining nominal 12 V operation. Use Value: Withstands 6600 W peak pulse and 700 A IFSM, preventing latch-up or damage to upstream DC/DC converters and microcontrollers. | Use Scenario: Shields 12 V power feeding isolated CAN transceivers in BCM against ignition-induced transients and jump-start spikes. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed between fuse and LDO input, limiting voltage seen by CAN PHY power domain. Use Value: 27.6 V clamping voltage ensures downstream LDO remains within absolute maximum ratings during 10/1000 μs surges. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Safeguards 12 V input of rear-view camera module mounted near exhaust or engine bay. IC Role / Device Role / Timing Role: Primary overvoltage protection device on main power rail, coordinated with ceramic capacitors for fast transient suppression. Use Value: 175 °C TJ max and RθJM = 0.35 °C/W enable stable operation at ambient temperatures exceeding 125 °C. | Use Scenario: Guards high-current 12 V supply to EPS motor driver ICs against inductive kickback from H-bridge switching. IC Role / Device Role / Timing Role: High-surge-capability TVS placed at power entry point, diverting energy away from gate drivers and current sense amplifiers. Use Value: 239 A IPPM rating handles repetitive switching surges without degradation, supporting ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S17AHM3 | No /I suffix; standard tape-and-reel packaging without moisture sensitivity labeling. | Same electrical specs and AEC-Q101 qualification; differs only in packaging compliance documentation. | Select SM8S17AHM3/I when MSL Level 1 traceability and RoHS-compliant labeling per J-STD-020 are contractually required. |
| SM8S18AHM3/I | Higher VWM (18 V) and VBR (20.0–22.1 V); 29.2 V clamping voltage at 226 A IPPM. | Better margin for 13.5 V nominal systems; slightly reduced surge current capacity vs. SM8S17AHM3/I. | Choose SM8S18AHM3/I if system nominal voltage varies up to 13.5 V and tighter clamping margin is acceptable. |
Compared with SM8S17AHM3/I, SM8S17AHM3 offers identical protection performance with simplified packaging compliance, while SM8S18AHM3/I trades 1 V higher standoff for lower clamping current-enabling design flexibility in 12 V/13.5 V hybrid architectures without changing PCB layout.
Availability
SM8S17AHM3/I is available at Aetrix Electronics and suitable for automotive power electronics, engine control units, and ADAS camera modules requiring stable component supply, AEC-Q101 compliance, and high-temperature surge resilience.
Supply support for SM8S17AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on automotive, industrial, and computing applications.
The SM8S series is engineered specifically for high-energy transient suppression in automotive 12 V systems, addressing ISO7637-2 load dump and inductive switching events with robust thermal and reliability performance.
FAQ
What is the clamping voltage of the SM8S17AHM3/I at its rated peak pulse current?
The SM8S17AHM3/I has a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current of 239 A under the 10/1000 μs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events. The SM8S17AHM3/I maintains this clamping performance across its full operating temperature range due to its controlled VBR temperature coefficient.
Is the SM8S17AHM3/I suitable for use in automotive under-hood applications?
Yes, the SM8S17AHM3/I is explicitly designed for under-hood deployment: it is AEC-Q101 qualified, rated for TJ = -55 °C to +175 °C, and validated per ISO7637-2 Pulse 5a (load dump). Its DO-218AB package features a metal heatsink directly bonded to the anode, enabling low RθJM (0.35 °C/W) for effective thermal coupling to chassis or PCB copper, making SM8S17AHM3/I appropriate for engine control units and transmission control modules.
Does the SM8S17AHM3/I have bidirectional or unidirectional polarity?
The SM8S17AHM3/I is unidirectional only, with polarity marked by anode connection to the metal heatsink and cathode on lead 1. This configuration blocks reverse current flow below VWM (17 V) and clamps only positive transients-ideal for protecting DC power rails where polarity is fixed. Vishay specifies no bidirectional variant in the SM8S10A–SM8S43A family; SM8S17AHM3/I must be oriented correctly in-circuit to avoid failure.
What is the meaning of the "/I" suffix in SM8S17AHM3/I?
The "/I" suffix in SM8S17AHM3/I denotes compliance with J-STD-020 moisture sensitivity level (MSL) Level 1, confirmed by packaging documentation and labeling. It indicates unlimited floor life at ≤30 °C/60 % RH and eliminates pre-reflow baking requirements. The core electrical and thermal specifications of SM8S17AHM3/I are identical to SM8S17AHM3; the /I designation reflects traceable process control and packaging verification-not a parametric change.
How does the SM8S17AHM3/I compare to older SM8S17A in terms of qualification and reliability?
The SM8S17AHM3/I replaces the legacy SM8S17A with enhanced manufacturing controls: it carries the "H" (AEC-Q101 qualified) and "E3" (RoHS-compliant, halogen-free, Pb-free) suffixes, whereas SM8S17A lacks formal AEC-Q101 certification. SM8S17AHM3/I also features improved junction passivation and MSL Level 1 compliance-critical for modern automotive SMT lines. Vishay explicitly lists SM8S17AHM3/I as the recommended alternative for new designs requiring guaranteed automotive reliability.
SM8S17AHM3/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):
- 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-218AC
SM8S17AHM3/I FAQ
1.How can I place an order for SM8S17AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S17AHM3/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 SM8S17AHM3/I reliable?
The price and inventory of SM8S17AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S17AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S17AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S17AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S17AHM3/I?
SM8S17AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S17AHM3/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 SM8S17AHM3/I?
For technical support, including SM8S17AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S17AHM3/I requirements.
6.How does Aetrix verify that SM8S17AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S17AHM3/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 SM8S17AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S17AHM3/I?
All SM8S17AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S17AHM3/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 SM8S17AHM3/I part is unused and in its original packaging.
Return procedure for SM8S17AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S17AHM3/I Tags
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