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Vishay General Semiconductor - Diodes Division SMBJ8.5CAHE3/5B
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- Part No.:
- SMBJ8.5CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CAHE3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,037
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Product details
Overview
SMBJ8.5CAHE3/5B from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamps to ≤14.4 V at 41.7 A peak surge current - deployed in sensor interface protection and industrial I/O circuits.
For engineers reviewing the SMBJ8.5CAHE3/5B datasheet, SMBJ8.5CAHE3/5B pinout, SMBJ8.5CAHE3/5B application, or SMBJ8.5CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compliance with UL 497B for telecom and automotive electronics protection.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the 10/1000 μs waveform rating reflects real-world lightning and inductive-switching surge immunity.
The device is rated for TJ = –55 °C to +150 °C operation and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its 20 °C/W junction-to-lead thermal resistance supports localized heat dissipation during repetitive surges when mounted on recommended 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - guaranteed breakdown threshold for reliable transient detection |
| VC @ IPPM | 14.4 V at 41.7 A - clamped voltage during 600 W surge, defining worst-case stress on downstream ICs |
| PPPM | 600 W (10/1000 μs) - standardized surge energy handling capacity for IEC 61000-4-5 level 3/4 compliance |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves signal integrity in high-impedance sensor or analog front-end paths |
| TJ max | +150 °C - enables use in under-hood automotive or industrial environments with elevated ambient temperatures |
| Package | SMB (DO-214AA) - industry-standard SMD outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; symmetrical with cathode in bidirectional mode |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive transients; functionally identical to anode due to bidirectional design |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity concerns |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics requiring reliability under thermal cycling and vibration |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges (e.g., 1 kV/500 A) without degradation when properly mounted |
| UL 497B recognized | Approved for telecom line protection per Underwriters Laboratories standard QVGQ2, supporting certified system-level safety compliance |
| MSL Level 1 | Zero floor life limitation - can be stored indefinitely at ≤30 °C/60% RH and assembled using standard 260 °C reflow profiles |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensors from ESD and load-dump induced transients in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor input terminals to clamp ±15 kV ESD and 100 V inductive spikes before they reach precision ADC or op-amp front ends. Use Value: Prevents latch-up or permanent damage to analog signal conditioning ICs while maintaining <1.0 μA leakage to avoid loop-current error. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs against battery reverse connection and alternator load dump in door module ECUs. IC Role / Device Role / Timing Role: Placed at LIN physical layer inputs to limit transient voltage to <14.4 V, ensuring transceiver remains within absolute maximum ratings during 12 V system faults. Use Value: Enables compliance with ISO 7637-2 Pulse 1/2a/5a test requirements without additional series impedance or filtering. |
| Telecom Line Protection | Consumer USB Port ESD Clamp |
|
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges in outdoor access points. IC Role / Device Role / Timing Role: Mounted across secondary-side transformer windings to absorb common-mode surges up to 600 W, coordinated with gas discharge tubes on primary side. Use Value: Achieves UL 497B recognition for telecom safety certification while limiting let-through voltage to protect 3.3 V PHY ICs. |
Use Scenario: Adding secondary-level ESD protection to USB 2.0 data lines (D+/D−) in portable speakers and smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed adjacent to USB connector to shunt ±8 kV contact ESD per IEC 61000-4-2 without signal distortion. Use Value: Maintains signal integrity with <10 pF typical junction capacitance at zero bias, avoiding USB 2.0 eye diagram degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated by OEM environmental policy | Direct substitution if halogen-free bill-of-materials is required; same thermal and clamping performance |
| SMAJ8.5CAHE3/5B | Lower 400 W PPPM rating; SMA (DO-214AC) package with smaller 4.5 mm × 2.7 mm footprint and higher RθJA (140 °C/W) | Used where board space is constrained but surge energy demand is lower (e.g., non-automotive consumer ports) | Not drop-in: requires layout change due to different pad dimensions and reduced surge margin; verify thermal derating |
Compared with SMBJ8.5CAHE3/5B, the M3/5B alternative offers identical protection performance with halogen-free construction, while the SMAJ8.5CAHE3/5B trades 33 % lower surge power and higher thermal resistance for 40 % smaller PCB area - making it suitable only for less demanding transient environments.
Availability
SMBJ8.5CAHE3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom line protection, and consumer USB port ESD protection requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ8.5CAHE3/5B 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, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 validation and UL safety recognition are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ8.5CAHE3/5B?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ8.5CAHE3/5B provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SMBJ8.5A), it has no cathode band marking and functions identically in either polarity - essential for protecting AC-coupled lines like RS-485 or transformer-isolated interfaces without polarity constraints.
Is SMBJ8.5CAHE3/5B qualified for automotive use?
Yes, SMBJ8.5CAHE3/5B is AEC-Q101 qualified, as confirmed by Vishay's ordering code "HE3" suffix and documentation note "(1) AEC-Q101 qualified". This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock - validating its suitability for under-hood and chassis-mounted automotive ECUs such as body control modules and lighting drivers.
What is the maximum clamping voltage of SMBJ8.5CAHE3/5B under surge conditions?
The maximum clamping voltage (VC) of SMBJ8.5CAHE3/5B is 14.4 V, measured at its peak pulse current (IPPM) of 41.7 A under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a 600 W transient event and is critical for ensuring downstream ICs remain within their absolute maximum ratings.
How does SMBJ8.5CAHE3/5B differ from unidirectional SMBJ8.5AHE3/5B?
SMBJ8.5CAHE3/5B is bidirectional with symmetrical VBR and VC in both directions, while SMBJ8.5AHE3/5B is unidirectional with a marked cathode band and conducts only in reverse bias. The CA version supports AC signal protection without polarity awareness; the A version requires correct orientation and offers slightly lower leakage (0.5 μA vs. 1.0 μA) but cannot handle negative transients without external circuitry.
What PCB layout guidance applies to SMBJ8.5CAHE3/5B for optimal thermal performance?
For optimal thermal performance, SMBJ8.5CAHE3/5B must be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal, as specified in Vishay's datasheet note "(2) Mounted on 0.2\" x 0.2\" (5.0 mm x 5.0 mm) copper pads". This pad size ensures the stated RθJA of 100 °C/W and prevents thermal runaway during repetitive surges; smaller pads increase junction temperature and reduce surge endurance.
SMBJ8.5CAHE3/5B 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ8.5CAHE3/5B FAQ
1.How can I place an order for SMBJ8.5CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CAHE3/5B 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 SMBJ8.5CAHE3/5B reliable?
The price and inventory of SMBJ8.5CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CAHE3/5B?
SMBJ8.5CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CAHE3/5B 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 SMBJ8.5CAHE3/5B?
For technical support, including SMBJ8.5CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CAHE3/5B requirements.
6.How does Aetrix verify that SMBJ8.5CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CAHE3/5B 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 SMBJ8.5CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CAHE3/5B?
All SMBJ8.5CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CAHE3/5B, 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 SMBJ8.5CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.5CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CAHE3/5B Tags
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