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Vishay General Semiconductor - Diodes Division SMB8J17CAHM3_A/H
- Part No.:
- SMB8J17CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J17CAHM3_A/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,934
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Product details
Overview
SMB8J17CAHM3_A/H 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), 29.0 A peak pulse current (IPPM) under 10/1000 µs waveform, and clamps transients to ≤27.6 V at rated surge. It is AEC-Q101 qualified and halogen-free, targeting automotive sensor interfaces and industrial control I/O protection.
For engineers reviewing the SMB8J17CAHM3_A/H datasheet, SMB8J17CAHM3_A/H pinout, SMB8J17CAHM3_A/H application, or SMB8J17CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, 800 W peak pulse power rating, AEC-Q101 qualification status, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device during ESD or lightning-induced surges, leveraging an avalanche breakdown mechanism with glass-passivated junction. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity concerns.
It delivers 800 W peak pulse power (10/1000 µs), exhibits low clamping ratio (VC/VWM ≈ 1.62), and maintains <1.0 µA reverse leakage at 17 V - critical for low-power sensor front-ends. Thermal resistance is 72 °C/W (junction-to-ambient) on standard PCB pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 18.9 V / 20.9 V - breakdown occurs within this range at 1 mA test current, ensuring predictable turn-on |
| VC @ IPPM | ≤27.6 V - clamped voltage during 29.0 A surge, limiting downstream IC stress |
| PPPM | 800 W - peak transient energy absorption capacity per 10/1000 µs pulse |
| IPPM | 29.0 A - maximum non-repetitive surge current it safely diverts |
| TJ max. | +150 °C - maximum junction temperature, supporting under-hood automotive use |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads. Case meets UL 94 V-0; polarity unmarked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient return path | Provides symmetrical conduction in both directions; no cathode band marking required |
| Cathode (unmarked end) | Transient return path | Electrically identical to anode due to bidirectional construction; terminals interchangeable |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity constraints |
| AEC-Q101 qualification | Validates robustness for automotive applications including engine control, ADAS sensors, and body electronics |
| Low clamping voltage (27.6 V) | Reduces voltage overshoot across protected ICs, improving system-level surge immunity margin |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental compliance requirements and supports green manufacturing |
| MSL Level 1 (260 °C peak) | Enables standard reflow soldering without moisture sensitivity handling |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point. Use Value: Limits transient voltage to ≤27.6 V, preventing damage to 3.3 V/5 V sensor signal conditioning ICs while maintaining signal integrity. | Use Scenario: Safeguarding digital input modules against induced surges from relay coil switching and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels before optocoupler or MCU GPIO. Use Value: Absorbs 800 W surges without degradation, enabling reliable operation in harsh electromagnetic environments per IEC 61000-4-5. |
| Consumer USB Port Protection | Telecom Line Interface |
Use Scenario: Shielding USB 2.0 data lines (D+/D−) from ESD events and cable discharge in portable devices. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed adjacent to USB connector. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) while adding minimal signal distortion due to symmetric response. | Use Scenario: Protecting Ethernet PHY or DSL line drivers from lightning-induced surges on twisted-pair telecom interfaces. IC Role / Device Role / Timing Role: First-stage surge limiter on balanced line pairs before isolation transformer. Use Value: Handles 29.0 A peak surge current with fast <1 ns response, preserving signal fidelity in high-speed data links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J17CAHE3_A/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred for commercial-automotive hybrids where halogen content is not restricted | Select when halogen-free requirement is waived and cost optimization is prioritized |
| SMAJ17CA | Lower power rating (400 W), smaller SMA package, higher RθJA (110 °C/W) | Suitable for space-constrained consumer designs with lower surge exposure | Choose only if 800 W rating is unnecessary and board area is critical |
Compared with SMB8J17CAHM3_A/H, the HE3 variant offers identical performance without halogen-free compliance, while SMAJ17CA trades power handling and thermal performance for footprint reduction - making SMB8J17CAHM3_A/H optimal for demanding automotive and industrial surge environments.
Availability
SMB8J17CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor systems, industrial PLC I/O modules, and telecom line interface designs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMB8J17CAHM3_A/H 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 and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional surge suppression in automotive and industrial environments where AEC-Q101 compliance and consistent clamping are mandatory.
FAQ
What is the clamping voltage of SMB8J17CAHM3_A/H at its rated peak pulse current?
The SMB8J17CAHM3_A/H clamps to a maximum of 27.6 V when subjected to its rated 29.0 A peak pulse current (10/1000 µs waveform). This value is measured under standardized test conditions and ensures downstream circuitry remains below safe voltage thresholds during surge events. The clamping performance is guaranteed across the full operating temperature range of −55 °C to +150 °C.
Is SMB8J17CAHM3_A/H suitable for automotive applications?
Yes, SMB8J17CAHM3_A/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials. Its construction includes glass-passivated junctions and MSL Level 1 moisture sensitivity, enabling direct integration into automotive ECUs, ADAS sensor nodes, and body control modules. The SMB8J17CAHM3_A/H meets stringent reliability requirements for under-hood and cabin-mounted electronics.
How does the bidirectional design of SMB8J17CAHM3_A/H affect its placement on the PCB?
The SMB8J17CAHM3_A/H has no polarity marking and functions identically in either orientation, simplifying layout and eliminating risk of reverse installation. This symmetry allows placement across differential pairs (e.g., RS-485, CAN) or AC-coupled signals without directional constraints. Its DO-214AA outline fits standard SMB footprints, and no silkscreen polarity indicator is needed.
What is the maximum reverse leakage current for SMB8J17CAHM3_A/H at its standoff voltage?
At the 17 V standoff voltage (VWM), SMB8J17CAHM3_A/H exhibits a maximum reverse leakage current of 1.0 µA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and minimizes standby power loss in battery-operated systems. Leakage remains below 5.0 µA up to +85 °C per specification.
Can SMB8J17CAHM3_A/H replace unidirectional TVS diodes in existing designs?
No - SMB8J17CAHM3_A/H is strictly bidirectional and must not be substituted for unidirectional TVS diodes (e.g., SMB10J17A) without circuit review. Unidirectional parts conduct forward during positive transients only, whereas SMB8J17CAHM3_A/H clamps in both polarities. Replacing one with the other may cause unintended conduction or fail to protect DC-biased lines correctly.
SMB8J17CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J17CAHM3_A/H FAQ
1.How can I place an order for SMB8J17CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J17CAHM3_A/H 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 SMB8J17CAHM3_A/H reliable?
The price and inventory of SMB8J17CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J17CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J17CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J17CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J17CAHM3_A/H?
SMB8J17CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J17CAHM3_A/H 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 SMB8J17CAHM3_A/H?
For technical support, including SMB8J17CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J17CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J17CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J17CAHM3_A/H 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 SMB8J17CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J17CAHM3_A/H?
All SMB8J17CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J17CAHM3_A/H, 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 SMB8J17CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMB8J17CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J17CAHM3_A/H Tags
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Diodes Incorporated
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