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Vishay General Semiconductor - Diodes Division SM8S17ATHE3/I
- Part No.:
- SM8S17ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S17ATHE3/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,997
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Product details
Overview
SM8S17ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 17 V stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 5 mA, 6600 W peak pulse power (10/1000 μs), 175 °C junction rating, and DO-218AC package with anode-heatsink polarity.
For engineers reviewing the SM8S17ATHE3/I datasheet, SM8S17ATHE3/I pinout, SM8S17ATHE3/I application, or SM8S17ATHE3/I equivalent, key selection criteria include its AEC-Q101 qualification, ISO7637-2 compliance for automotive transients, low leakage (<10 μA at VWM), and high surge capability (239 A IPPM at 10/1000 μs).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under high-temperature operation up to TJ = 175 °C. Its unidirectional configuration and heatsink-anode construction enable efficient thermal dissipation in high-power transient events such as 12 V automotive load dump.
The device meets MSL Level 1 per J-STD-020 (peak reflow 245 °C) and exhibits low forward voltage drop (VF ≤ 1.8 V at 100 A), enabling robust protection without excessive conduction loss during surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.0 V - Maximum reverse operating voltage before clamping begins; defines safe DC bias margin in 12 V automotive systems. |
| VBR (min/typ/max) | 18.9 / 19.9 / 20.9 V at 5 mA - Confirmed breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 27.6 V - Clamping voltage at 239 A peak pulse current; limits downstream IC stress during ISO7637-2 load dump. |
| PPPM (10/1000 μs) | 6600 W - Sustains high-energy surges typical of alternator load dump without failure. |
| TJ max | +175 °C - Enables placement near hot engine control units without derating concerns. |
| Leakage @ VWM | <10 μA at 25 °C - Minimizes standby power loss in always-on vehicle modules. |
| RθJC | 0.90 °C/W - Low thermal resistance supports direct mounting to metal chassis for effective heat sinking. |
Pinout & Package
Package: DO-218AC - Surface-mount, anode-heatsink configuration with matte tin-plated leads; meets UL 94 V-0, JESD 201 Class 2 whisker resistance, and RoHS compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current entry point during clamping; electrically connected to metal case | Must be soldered to large copper pour or chassis for thermal management and low-inductance path to ground. |
| Cathode (Lead 1) | Current exit point during clamping; connected to protected line | Placed in series between supply rail and sensitive electronics; provides low-impedance shunt path during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical shock per stress test requirements. |
| ISO7637-2 compliant | Withstands defined load dump waveforms (e.g., Pulse 5a) without degradation or parametric shift. |
| Junction passivation optimized | Reduces surface leakage and improves long-term stability under high-humidity and high-temperature conditions. |
| MSL Level 1 rating | Allows standard SMT reflow without pre-baking; compatible with high-volume automotive PCB assembly lines. |
| Low VF (≤1.8 V @ 100 A) | Minimizes conduction losses and self-heating during repetitive surge events, preserving clamping accuracy. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) CAN Bus Power Line |
|---|---|
Use Scenario: Protects ECU 12 V supply rail against alternator load dump transients during battery disconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and input filter capacitor; clamps voltage within 27.6 V to prevent damage to LDOs and microcontrollers. Use Value: Prevents system reset or latch-up by limiting transient overvoltage to safe levels while sustaining 6600 W surge energy. | Use Scenario: Shields BCM power domain feeding isolated CAN transceivers from coupled transients on shared vehicle battery rail. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V input to CAN power regulator; coordinates with secondary TVS on signal lines. Use Value: Ensures uninterrupted CAN communication during load dump by maintaining regulated 5 V/3.3 V supply integrity. |
| ADAS Camera Module Power Supply | Electric Power Steering (EPS) Motor Driver Board |
Use Scenario: Safeguards image sensor and ISP power rails in front-facing ADAS cameras exposed to harsh under-hood environments. IC Role / Device Role / Timing Role: First-line transient suppressor on main 12 V input; works with ceramic decoupling and ferrite beads to attenuate fast edges. Use Value: Maintains pixel integrity and prevents firmware corruption during repeated ignition cycles and load dump events. | Use Scenario: Protects gate drivers and MCU power supplies on EPS motor control boards subjected to high-current switching noise and load dump. IC Role / Device Role / Timing Role: High-energy TVS mounted directly to heatsink plane; absorbs energy before it reaches sensitive analog and digital circuitry. Use Value: Eliminates field failures caused by transient-induced gate driver latch-up or MCU brown-out resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S17AHM3 | Same electrical specs; HM3 suffix indicates halogen-free, lead-free, and enhanced moisture sensitivity level (MSL 1) packaging. | No functional difference; identical use in automotive load dump protection circuits. | Select when halogen-free compliance or updated JEDEC moisture handling is required. |
| SMAJ17A | Lower PPPM (400 W vs. 6600 W); DO-214AC package; no AEC-Q101 qualification. | Suitable only for low-energy transients (e.g., ESD, inductive spikes), not load dump. | Use only in non-automotive, low-risk applications where surge energy is below 500 W. |
Compared with SM8S17ATHE3/I, SM8S17AHM3 offers identical protection performance with updated environmental compliance, while SMAJ17A lacks the energy-handling capability and automotive qualification needed for load dump scenarios-making SM8S17ATHE3/I the only suitable choice for AEC-Q101–mandated 12 V systems.
Availability
SM8S17ATHE3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across extended production lifecycles.
Supply support for SM8S17ATHE3/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 with emphasis on reliability, thermal performance, and automotive qualification.
The SM8SxxAT family was engineered specifically for high-energy transient suppression in 12 V automotive power networks, addressing ISO7637-2 load dump and meeting AEC-Q101 stress test requirements.
FAQ
What is the maximum clamping voltage of SM8S17ATHE3/I at rated peak pulse current?
The SM8S17ATHE3/I has a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current (IPPM) of 239 A under a 10/1000 μs waveform. This value is measured at TC = 25 °C and ensures downstream components remain within safe operating voltage limits during automotive load dump events. The SM8S17ATHE3/I maintains this clamping performance across its full operating temperature range due to its 0.082 %/°C VBR temperature coefficient.
Is SM8S17ATHE3/I qualified for automotive applications?
Yes, SM8S17ATHE3/I is AEC-Q101 qualified and explicitly intended for automotive use. Its qualification covers temperature cycling, humidity testing, mechanical shock, and high-temperature operating life. The HE3 suffix denotes RoHS-compliant, whisker-resistant, and automotive-grade construction. The SM8S17ATHE3/I also meets ISO7637-2 for load dump immunity and is rated for TJ = -55 °C to +175 °C, making it suitable for under-hood deployment.
What does the "HE3" suffix mean in SM8S17ATHE3/I?
The "HE3" suffix in SM8S17ATHE3/I indicates a RoHS-compliant, AEC-Q101–qualified version with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards. It also satisfies JESD 201 Class 2 whisker resistance and is packaged in 13" plastic tape and reel (750 pcs/reel) with anode oriented toward sprocket holes. The HE3 variant is the recommended version for new designs targeting automotive reliability requirements.
Can SM8S17ATHE3/I replace SM8S17AHM3 in existing designs?
SM8S17ATHE3/I and SM8S17AHM3 share identical electrical specifications and thermal performance but differ in packaging compliance: HM3 is halogen-free and conforms to newer JEDEC moisture sensitivity requirements, while HE3 meets legacy AEC-Q101 and RoHS standards. No PCB or layout changes are required for substitution, but design validation should confirm compatibility with reflow profile and moisture handling procedures specific to HM3's MSL 1 rating.
What is the thermal resistance from junction to case for SM8S17ATHE3/I?
The SM8S17ATHE3/I has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W, measured under standard test conditions. This low value enables effective heat transfer from the silicon die to the external heatsink or PCB copper plane, supporting continuous operation at elevated ambient temperatures. Proper mounting of the anode-heatsink terminal to a thermally conductive surface is essential to realize this thermal performance in actual application.
SM8S17ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SM8S17ATHE3/I FAQ
1.How can I place an order for SM8S17ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S17ATHE3/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 SM8S17ATHE3/I reliable?
The price and inventory of SM8S17ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S17ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM8S17ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S17ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S17ATHE3/I?
SM8S17ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S17ATHE3/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 SM8S17ATHE3/I?
For technical support, including SM8S17ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S17ATHE3/I requirements.
6.How does Aetrix verify that SM8S17ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM8S17ATHE3/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 SM8S17ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM8S17ATHE3/I?
All SM8S17ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S17ATHE3/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 SM8S17ATHE3/I part is unused and in its original packaging.
Return procedure for SM8S17ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S17ATHE3/I Tags
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