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Vishay General Semiconductor - Diodes Division SMB8J17CAHM3/I
- Part No.:
- SMB8J17CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J17CAHM3/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,249
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Product details
Overview
SMB8J17CAHM3/I 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 I/O protection.
For engineers reviewing the SMB8J17CAHM3/I datasheet, SMB8J17CAHM3/I pinout, SMB8J17CAHM3/I application, or SMB8J17CAHM3/I equivalent, this device delivers verified bidirectional clamping performance with MSL Level 1 moisture sensitivity, 150 °C max junction temperature, and J-STD-002-compliant matte tin terminations - critical for automotive-grade board-level ESD and load-dump immunity design.
Technical Context
This TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown threshold (18.9–20.9 V), it avalanches rapidly (<1 ns response) to divert surge energy away from downstream ICs. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints.
Thermal design relies on low RθJL = 20 °C/W (junction-to-lead) and RθJA = 72 °C/W (junction-to-ambient), requiring minimum 5.0 mm × 5.0 mm copper pads per terminal per Vishay's layout recommendation. The glass-passivated junction ensures stable leakage (<1.0 µA at 17 V) and long-term reliability under repetitive surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating 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 range at 1 mA test current; ensures consistent turn-on across production lots. |
| IPPM | 29.0 A - Peak surge current it safely clamps under standardized 10/1000 µs waveform; supports ISO 7637-2 Pulse 1 & 2a compliance. |
| VC | ≤27.6 V - Clamping voltage at IPPM; limits stress on protected ICs (e.g., CAN transceivers rated to 36 V abs max). |
| PPPM | 800 W - Peak pulse power dissipation capability; enables robust protection against lightning-induced surges per IEC 61000-4-5. |
| TJ max | +150 °C - Maximum junction temperature rating; supports under-hood automotive placement with no derating up to 125 °C ambient. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling, HTRB, and ESD testing per stress test plan. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Surge current path | Identical terminals; bidirectional conduction allows placement without orientation check during automated assembly. |
| Case (body) | Thermal and mechanical interface | Plastic body with UL 94 V-0 rating; requires 5.0 mm × 5.0 mm copper pad per lead for thermal dissipation and mechanical anchoring. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC, differential, or floating signal lines (e.g., RS-485, CAN FD) without external polarity management. |
| AEC-Q101 qualification | Validated for automotive electronics including engine control modules, ADAS sensors, and infotainment I/O protection. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive OEM environmental requirements and JEDEC JESD201 Class 2 whisker resistance. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 8.7 V) versus competing 17 V TVS devices, reducing voltage overshoot on protected nodes. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT processes without baking or special handling prior to assembly. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to load dump and ISO 16750-2 transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping surges before they reach MCU ADC inputs or LIN transceivers. Use Value: Maintains signal integrity by limiting voltage excursions to ≤27.6 V during 29 A surges, preventing latch-up or permanent damage to 5 V or 3.3 V sensor signal chains. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring subject to inductive switching spikes and EFT bursts. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each input line, working in concert with series current-limiting resistors and optocouplers. Use Value: Withstands repeated 800 W surges without degradation, enabling >100,000 surge cycles per IEC 61000-4-4 compliance testing. |
| Automotive Body Control Module | Consumer Appliance Motor Drive Inputs |
Use Scenario: Input protection for BCM door lock actuators, window lift motors, and lighting drivers subjected to battery reverse connection and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across motor driver enable lines and feedback sensing paths to absorb both positive and negative polarity surges. Use Value: AEC-Q101 qualification ensures operation across −40 °C to +125 °C ambient, with no parameter shift after thermal cycling or humidity exposure. |
Use Scenario: Surge suppression on microcontroller GPIO lines driving small BLDC fans or solenoids in smart home appliances. IC Role / Device Role / Timing Role: Low-capacitance (typ. <50 pF) shunt protector minimizing signal distortion on 10 kHz PWM control lines. Use Value: Clamps 10/1000 µs surges to ≤27.6 V while adding <0.5 pF parasitic capacitance - preserving rise/fall time integrity on 3.3 V logic signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J17CAHE3/I | Same electrical specs but RoHS-compliant (non-halogen-free); lacks JESD201 Class 2 whisker resistance. | Suitable for commercial/industrial designs where halogen-free requirement is not mandated. | Select HE3/I if cost sensitivity outweighs automotive environmental compliance needs. |
| SMAJ17CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), unqualified for AEC-Q101. | Limited to low-energy consumer applications; cannot meet automotive surge immunity requirements. | Choose only for space-constrained non-automotive PCBs where 800 W surge capacity is unnecessary. |
Compared with SMB8J17CAHM3/I, the HE3/I variant offers identical clamping and surge ratings but omits halogen-free certification, while SMAJ17CA sacrifices 50 % peak power handling and automotive qualification - making SMB8J17CAHM3/I the sole option meeting full AEC-Q101 + 800 W + halogen-free requirements in SMB footprint.
Availability
SMB8J17CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and body control module surge immunity requiring stable component supply across extended product lifecycles.
Supply support for SMB8J17CAHM3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMB8JxxCA series targets automotive-grade transient suppression, engineered specifically for AEC-Q101 compliance, high-power density packaging, and robust performance in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of SMB8J17CAHM3/I at its rated peak pulse current?
The SMB8J17CAHM3/I clamps to a maximum of 27.6 V when subjected to its rated 29.0 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured and guaranteed per Vishay Document 88422, ensuring predictable overvoltage limiting for downstream 3.3 V or 5 V ICs protected by SMB8J17CAHM3/I.
Is SMB8J17CAHM3/I suitable for bidirectional signal line protection such as RS-485 or CAN bus?
Yes, SMB8J17CAHM3/I is explicitly designed as a bidirectional TVS diode, making it appropriate for protecting balanced differential interfaces like RS-485 and CAN bus. Its symmetrical breakdown (18.9–20.9 V in both directions) and low clamping voltage (≤27.6 V) ensure equal surge suppression on both signal lines without polarity concerns - a key requirement for SMB8J17CAHM3/I in automotive and industrial communication systems.
Does SMB8J17CAHM3/I require special PCB layout considerations?
Yes - Vishay specifies minimum 5.0 mm × 5.0 mm copper pads per terminal to achieve rated thermal performance and surge capability. Using smaller pads reduces IPPM derating and risks thermal runaway during repeated surges. The SMB8J17CAHM3/I datasheet (Fig. 2) provides exact pad dimensions and copper weight recommendations to maintain RθJA = 72 °C/W and ensure reliable operation at 150 °C junction temperature.
What does the "HM3" suffix indicate in SMB8J17CAHM3/I?
The "HM3" suffix in SMB8J17CAHM3/I denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance - required for automotive OEM compliance. It also confirms AEC-Q101 qualification and packaging in 13-inch tape-and-reel (I-code). This distinguishes SMB8J17CAHM3/I from E3/M3 variants and ensures full environmental and reliability alignment with Tier 1 automotive supply chain mandates.
Can SMB8J17CAHM3/I replace SMBJ17CA in an existing design?
No - SMBJ17CA is a 600 W unidirectional device in SMB package, whereas SMB8J17CAHM3/I is an 800 W bidirectional part. Their polarity, surge rating, and clamping behavior differ fundamentally. Substituting SMB8J17CAHM3/I for SMBJ17CA would require verifying circuit symmetry, revising layout for bidirectional placement, and revalidating surge immunity - SMB8J17CAHM3/I is not a drop-in replacement for SMBJ17CA.
SMB8J17CAHM3/I 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:
- 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/I FAQ
1.How can I place an order for SMB8J17CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J17CAHM3/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 SMB8J17CAHM3/I reliable?
The price and inventory of SMB8J17CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J17CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J17CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J17CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J17CAHM3/I?
SMB8J17CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J17CAHM3/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 SMB8J17CAHM3/I?
For technical support, including SMB8J17CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J17CAHM3/I requirements.
6.How does Aetrix verify that SMB8J17CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J17CAHM3/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 SMB8J17CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J17CAHM3/I?
All SMB8J17CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J17CAHM3/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 SMB8J17CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J17CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J17CAHM3/I Tags
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