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Vishay General Semiconductor - Diodes Division SMB8J17CAHE3/52
- Part No.:
- SMB8J17CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J17CAHE3/52.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,876
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Product details
Overview
SMB8J17CAHE3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 17 V standoff voltage (VWM), 27.6 V clamping voltage (VC) at 29.0 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J17CAHE3/52 datasheet, SMB8J17CAHE3/52 pinout, SMB8J17CAHE3/52 application, or SMB8J17CAHE3/52 equivalent, this device is selected for AEC-Q101-qualified bidirectional surge suppression where low clamping ratio, fast response (<1 ns), and MSL Level 1 reflow compatibility are required in space-constrained PCB layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under transient overvoltage exceeding its breakdown threshold (18.9–20.9 V), it avalanches to divert surge current away from downstream circuitry. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints.
Thermal design relies on low junction-to-lead thermal resistance (RθJL = 20 °C/W) and optimized copper pad layout (0.2" × 0.2") to sustain repetitive surges. The glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and long-term reliability across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V automotive or 15 V industrial rails. |
| VBR (min/max) | 18.9 V / 20.9 V - breakdown occurs within this band at 1 mA test current; ensures predictable turn-on timing across temperature and lot variation. |
| VC @ IPPM | 27.6 V - clamping voltage measured at 29.0 A peak pulse current; limits voltage seen by protected IC to <28 V during worst-case 10/1000 µs surge. |
| PPPM | 800 W - peak pulse power handling per 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IR @ VWM | <1.0 µA - ultra-low reverse leakage at rated standoff voltage; avoids signal distortion or battery drain in always-on sensor circuits. |
| TJ max | +150 °C - maximum junction temperature rating; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMB (DO-214AA) - surface-mount package with 2.2 mm height and 3.94 mm length; compatible with automated pick-and-place and IR reflow (260 °C peak). |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package: no polarity marking; symmetrical terminals function identically as anode/cathode depending on transient polarity. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode or Cathode (bidirectional) | Either terminal conducts during positive or negative transients; no fixed polarity - used interchangeably across differential or AC signal paths. |
| Terminal 2 | Anode or Cathode (bidirectional) | Paired terminal completing the bidirectional path; symmetric layout eliminates orientation dependency during assembly. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment - meets stress testing for temperature cycling, humidity, and mechanical shock. |
| MSL Level 1 (260 °C) | Supports lead-free reflow without popcorn cracking or delamination; eliminates pre-bake requirements and simplifies SMT line integration. |
| Glass-passivated junction | Ensures stable electrical parameters over time and temperature; prevents parameter drift due to moisture ingress or surface contamination. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage exposure during clamping - critical for protecting 3.3 V or 5 V logic interfaces adjacent to 12 V supply domains. |
| 800 W peak pulse power | Handles repeated IEC 61000-4-5 surges up to 4 kV (line-earth) without degradation when mounted on specified copper area. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting CAN FD or LIN bus transceivers from load dump and ESD events in vehicle body control modules. IC Role / Device Role / Timing Role: Shunt clamping element placed between signal line and ground, responding within <1 ns to transients exceeding 17 V. Use Value: Maintains signal integrity during 12 V rail disturbances while meeting ISO 16750-2 pulse 5a/b and ISO 7637-3 test requirements. |
Use Scenario: Safeguarding analog input channels of PLC analog I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across differential pair (e.g., 4–20 mA loop or RS-485), limiting common-mode transients. Use Value: Prevents ADC saturation and op-amp latch-up during 1 kV/500 A surge events per IEC 61000-4-5, preserving measurement accuracy. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
|
Use Scenario: Secondary-side surge suppression on 5 V/9 V USB-C PD adapter outputs subject to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Fast-acting shunt TVS placed after DC-DC converter output filter, clamping overshoot from regulator instability or load switching. Use Value: Limits output voltage excursion to ≤28 V during 10/1000 µs transients, preventing damage to connected mobile devices. |
Use Scenario: Primary protection for Ethernet PHY interface (10/100BASE-TX) on telecom access equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamp across transformer-coupled pairs, absorbing common-mode energy before reaching magnetics and PHY IC. Use Value: Enables compliance with GR-1089-CORE Level 3 (10/700 µs, 4 kV) while maintaining <1 pF junction capacitance to avoid signal attenuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17CAHE3/52 | Same VWM (17 V), VC (27.6 V), and SMB package; rated for 1000 W unidirectional PPPM but only 800 W bidirectional - identical clamping performance for AC signals. | Unidirectional variant requires polarity-aware placement; unsuitable for true AC or differential lines without external biasing. | Select SMB8J17CAHE3/52 when bidirectional symmetry is mandatory; choose SMBJ17CAHE3/52 only if circuit topology enforces fixed polarity and higher unidirectional power margin is needed. |
| SMCJ17CAHE3/52 | Same VWM and VC, but in larger SMC (DO-214AB) package with 1500 W bidirectional PPPM and lower RθJA (35 °C/W vs. 72 °C/W). | Requires 30% more board area; better suited for high-repetition-rate surges or elevated ambient temperatures (>85 °C). | Choose SMB8J17CAHE3/52 for space-constrained designs with moderate surge duty cycle; upgrade to SMCJ17CAHE3/52 only when thermal derating or >1000 W capability is required. |
Compared with SMBJ17CAHE3/52 and SMCJ17CAHE3/52, SMB8J17CAHE3/52 delivers optimal balance of AEC-Q101 qualification, bidirectional symmetry, and compact SMB footprint - making it the preferred choice for automotive and industrial PCBs where layout density and polarity-agnostic protection are prioritized over absolute peak power headroom.
Availability
SMB8J17CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer power adapter outputs, and telecom line card protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J17CAHE3/52 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 reliability, power efficiency, and automotive-grade qualification.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J17CAHE3/52 and how does it protect downstream ICs?
The SMB8J17CAHE3/52 clamps to 27.6 V at its rated 29.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This limits the maximum voltage imposed on protected circuitry during surge events, ensuring sensitive components like microcontrollers or transceivers remain below their absolute maximum ratings. The low clamping ratio (VC/VBR ≈ 1.46) reflects efficient energy diversion without excessive overvoltage - a key factor in maintaining system-level EMC robustness. SMB8J17CAHE3/52 achieves this via a precisely doped, glass-passivated silicon junction that avalanches predictably above 18.9 V.
Is SMB8J17CAHE3/52 suitable for automotive applications and what qualifications does it hold?
Yes, SMB8J17CAHE3/52 is explicitly AEC-Q101 qualified, as indicated by the "HE3" suffix in its ordering code. It has passed stress tests including temperature cycling, high-temperature reverse bias, and mechanical shock - validating its suitability for under-hood and cabin-mounted automotive systems such as ADAS cameras, body control modules, and infotainment interfaces. The device operates reliably from -55 °C to +150 °C and maintains low leakage (<1.0 µA) across that range, supporting long-term functionality in thermally demanding environments. SMB8J17CAHE3/52 is manufactured and tested to meet automotive-grade quality and traceability standards.
How does the SMB8J17CAHE3/52 differ from unidirectional TVS diodes like SMBJ17CAHE3/52?
SMB8J17CAHE3/52 is bidirectional, meaning it provides symmetrical clamping for both positive and negative transients without polarity dependence - ideal for AC-coupled lines, differential buses (e.g., CAN, RS-485), or circuits where voltage polarity may reverse. In contrast, SMBJ17CAHE3/52 is unidirectional and requires correct cathode/anode orientation; it offers higher peak pulse power (1000 W vs. 800 W) but cannot protect against reverse-polarity surges without additional components. SMB8J17CAHE3/52 eliminates layout ambiguity and reduces BOM count in bidirectional protection schemes.
What PCB layout practices are required to achieve the rated 800 W performance of SMB8J17CAHE3/52?
To sustain the full 800 W peak pulse power rating, SMB8J17CAHE3/52 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet Figure 2 and thermal characterization. These pads act as heat sinks to manage transient thermal energy and prevent junction overheating. Traces should be short and wide (≥20 mil), and ground planes should be solid beneath the device. Avoid thermal relief spokes on pads, and ensure solder mask defined (SMD) stencil apertures match the SMB outline. Failure to follow this layout results in premature thermal failure or derated IPPM.
Does SMB8J17CAHE3/52 have any special handling or assembly requirements?
SMB8J17CAHE3/52 is rated MSL Level 1 per J-STD-020, meaning it can withstand peak reflow temperatures up to 260 °C without pre-baking - simplifying SMT line integration. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability, and it passes JESD 201 Class 2 whisker testing. No special storage or dry pack requirements apply. However, because it is a glass-passivated device, avoid mechanical stress on the package body during handling or board flexure, and confirm stencil thickness (typically 125 µm) and paste volume to ensure reliable solder joint formation without voiding.
SMB8J17CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 29A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J17CAHE3/52 FAQ
1.How can I place an order for SMB8J17CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J17CAHE3/52 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 SMB8J17CAHE3/52 reliable?
The price and inventory of SMB8J17CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J17CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J17CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J17CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J17CAHE3/52?
SMB8J17CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J17CAHE3/52 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 SMB8J17CAHE3/52?
For technical support, including SMB8J17CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J17CAHE3/52 requirements.
6.How does Aetrix verify that SMB8J17CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J17CAHE3/52 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 SMB8J17CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J17CAHE3/52?
All SMB8J17CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J17CAHE3/52, 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 SMB8J17CAHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J17CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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