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Vishay General Semiconductor - Diodes Division SM8S17AHE3_A/I
- Part No.:
- SM8S17AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S17AHE3_A/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
SM8S17AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, designed for automotive load dump protection with 17.0 V stand-off voltage (VWM), 19.9 V nominal breakdown voltage (VBR), and 6600 W peak pulse power (10/1000 μs). It operates from −55 °C to +175 °C and is AEC-Q101 qualified.
For engineers reviewing the SM8S17AHE3_A/I datasheet, SM8S17AHE3_A/I pinout, SM8S17AHE3_A/I application, or SM8S17AHE3_A/I equivalent, this device is selected for high-reliability 12 V automotive power rail protection where low leakage (<10 μA at VWM), low clamping voltage (27.6 V at IPPM), and robust surge handling (239 A IPPM) are critical.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for junction stability at TJ = 175 °C, enabling sustained operation in under-hood automotive environments. Its unidirectional polarity and heatsink-anode configuration support direct mounting to thermal planes for efficient heat dissipation.
The device meets ISO 7637-2 surge requirements for automotive load dump transients and complies with MSL Level 1 (245 °C reflow peak). Thermal resistance is specified as RθJM = 0.35 °C/W (junction-to-mount) and RθJA = 55 °C/W (junction-to-ambient on FR4).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (nom) | 19.9 V at 5 mA - precise breakdown threshold ensuring predictable turn-on during transients |
| VC @ IPPM | 27.6 V at 239 A - clamping voltage limits downstream IC stress during 10/1000 μs surges |
| PPPM (10/1000 μs) | 6600 W - peak transient energy absorption capability for severe load dump events |
| ID @ VWM | <10 μA at 25 °C - minimal leakage preserves battery life in always-on vehicle modules |
| TJ max | +175 °C - enables placement near high-temperature engine control units without derating |
| IFSM | 700 A - surge current rating for 8.3 ms half-sine wave, supporting ignition coil switching |
Pinout & Package
Package: DO-218AB - thermally enhanced surface-mount case with metal heatsink terminal (anode) and molded cathode lead; meets UL 94 V-0, RoHS-compliant, JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Positive terminal / thermal interface | Must be soldered to copper pour or heatsink for RθJM = 0.35 °C/W performance |
| Cathode (Lead 1) | Transient current return path | Connected to protected line (e.g., battery rail); carries full surge current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR over 1000+ thermal cycles at 175 °C |
| AEC-Q101 qualification | Validated for automotive use including HTOL, temperature cycling, and HAST per stress test conditions |
| Low forward voltage drop | VF ≤ 1.8 V at 100 A (300 μs pulse) minimizes conduction loss during bidirectional surge events |
| MSL Level 1 rating | Compatible with standard 245 °C Pb-free reflow profiles without preconditioning |
| ISO 7637-2 compliance | Validated for Pulse 5a (load dump) up to 35 V, 400 ms duration with 10 Ω source impedance |
Applications
| Engine Control Unit (ECU) Power Protection | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller power inputs from 35 V/400 ms load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamps excess voltage within 1 ns, limiting rail excursion to ≤27.6 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies downstream of DC/DC converters. | Use Scenario: Shields LIN bus transceivers and EEPROMs from coupled transients induced by power window motor switching. IC Role / Device Role / Timing Role: Fast-response clamp absorbs 6600 W surges while maintaining <10 μA leakage during sleep mode. Use Value: Enables BCM to meet ISO 11898-2 EMC immunity requirements without additional filtering. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Safeguards image sensor and SerDes ICs against battery line spikes during cold-crank and jump-start events. IC Role / Device Role / Timing Role: Stand-off voltage of 17.0 V allows normal 12 V system operation while clamping >20 V transients. Use Value: Eliminates need for secondary overvoltage protection stages, reducing BOM count and PCB area. | Use Scenario: Protects gate drivers and current sense amplifiers from inductive kickback when EPS motor commutates. IC Role / Device Role / Timing Role: 700 A IFSM rating handles repetitive 8.3 ms half-sine surges from motor phase switching. Use Value: Extends functional safety lifetime beyond 15-year vehicle service life under thermal cycling 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 |
|---|---|---|---|
| SM8S17AHM3_A/I | Same electrical specs; HM3 suffix indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified with updated material content | No change in circuit function or layout; identical DO-218AB footprint and thermal behavior | Preferred for new designs due to active status and updated environmental compliance |
| SMAJ17A | Lower PPPM (400 W vs. 6600 W), smaller SMA package (RθJA = 110 °C/W), no AEC-Q101 qualification | Limited to non-automotive or low-energy transient environments; unsuitable for load dump | Only acceptable for cost-sensitive consumer applications with sub-100 A surge exposure |
Compared with SM8S17AHE3_A/I, SM8S17AHM3_A/I offers identical protection performance with updated environmental compliance and active design status, while SMAJ17A provides only baseline surge suppression in a less robust package-making it inadequate for automotive-grade reliability requirements.
Availability
SM8S17AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU power protection, body control module battery rail hardening, and ADAS camera supply stabilization requiring stable component supply across long production lifecycles.
Supply support for SM8S17AHE3_A/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 automotive, industrial, and computing applications.
The SM8SxxA family is engineered specifically for high-energy automotive load dump protection, delivering industry-leading 6600 W surge capability in the DO-218AB package to replace legacy SMC/SMB solutions with superior thermal performance.
FAQ
What is the maximum clamping voltage of the SM8S17AHE3_A/I at its rated peak pulse current?
The SM8S17AHE3_A/I has a maximum clamping voltage (VC) of 27.6 V when subjected to its peak pulse current (IPPM) of 239 A under the standard 10/1000 μs waveform. This value is measured at TA = 25 °C and ensures downstream components remain within safe operating voltage limits during severe transients such as automotive load dump events. The SM8S17AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is the SM8S17AHE3_A/I suitable for new automotive designs despite the "Not For New Designs" notice in Vishay documentation?
No-the "Not For New Designs" notice applies to the entire SM8S10A–SM8S43A HE3 series, including SM8S17AHE3_A/I. Vishay explicitly recommends SM8S17AHM3_A/I as the alternative for new designs. While SM8S17AHE3_A/I remains available and functional, it is not recommended for newly initiated projects due to material and qualification updates embodied in the HM3 suffix variant. Engineers should specify SM8S17AHM3_A/I for all new automotive schematics.
How does the DO-218AB package of the SM8S17AHE3_A/I improve thermal performance compared to standard SMC packages?
The DO-218AB package of the SM8S17AHE3_A/I features an integrated metal heatsink terminal (anode) that reduces thermal resistance to RθJM = 0.35 °C/W-over 3× lower than typical SMC packages. This allows the SM8S17AHE3_A/I to sustain 6600 W surges without exceeding TJ = 175 °C when mounted to a 1-in² copper pad. Standard SMC packages lack this direct thermal path, resulting in higher junction temperatures and premature failure under repeated load dump stress.
Does the SM8S17AHE3_A/I meet ISO 7637-2 Pulse 5a requirements out-of-the-box?
Yes-the SM8S17AHE3_A/I is validated to meet ISO 7637-2 Pulse 5a (load dump) requirements when used with appropriate board layout: minimum 1-in² 2-oz copper connected to the anode heatsink, and series impedance ≤10 Ω. Test data confirms clamping below 35 V for 400 ms duration at 175 °C junction temperature. No external components are required to satisfy the standard, though system-level validation is still mandatory per OEM test plans.
What is the leakage current specification for the SM8S17AHE3_A/I at elevated temperature?
At TJ = 175 °C and VWM = 17.0 V, the SM8S17AHE3_A/I exhibits a maximum reverse leakage current (ID) of 10 μA. This is confirmed in the Electrical Characteristics table and is critical for low-power automotive modules in sleep mode, where cumulative leakage across multiple protection devices could otherwise drain the battery. The SM8S17AHE3_A/I's low high-temperature leakage supports >10-year vehicle service life without parasitic discharge concerns.
SM8S17AHE3_A/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:
- 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-218AB
SM8S17AHE3_A/I FAQ
1.How can I place an order for SM8S17AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S17AHE3_A/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 SM8S17AHE3_A/I reliable?
The price and inventory of SM8S17AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S17AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM8S17AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S17AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S17AHE3_A/I?
SM8S17AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S17AHE3_A/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 SM8S17AHE3_A/I?
For technical support, including SM8S17AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S17AHE3_A/I requirements.
6.How does Aetrix verify that SM8S17AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM8S17AHE3_A/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 SM8S17AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM8S17AHE3_A/I?
All SM8S17AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S17AHE3_A/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 SM8S17AHE3_A/I part is unused and in its original packaging.
Return procedure for SM8S17AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S17AHE3_A/I Tags
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