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Vishay General Semiconductor - Diodes Division SMB8J8.5CA-E3/52
- Part No.:
- SMB8J8.5CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CA-E3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,675
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Product details
Overview
SMB8J8.5CA-E3/52 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 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 40 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 SMB8J8.5CA-E3/52 datasheet, SMB8J8.5CA-E3/52 pinout, SMB8J8.5CA-E3/52 application, or SMB8J8.5CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps to transients per ANSI/IEEE C62.35 standards. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping under repetitive 800 W surges.
Designed for bidirectional operation, SMB8J8.5CA-E3/52 exhibits symmetrical reverse/forward characteristics with no polarity marking, supports -55 °C to +150 °C junction temperature range, and meets MSL Level 1 (260 °C reflow peak), making it suitable for under-hood automotive modules and harsh-environment industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before significant leakage; sets safe margin below system supply rails |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - tight breakdown window ensures predictable turn-on across temperature and lot variation |
| VC @ IPPM | 14.4 V at 40 A - clamping voltage limits downstream IC stress during 10/1000 µs surge events |
| PPPM | 800 W - peak power handling capacity defines survivability against ISO 7637-2 Pulse 1/2/5a/b threats |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - enables deployment in engine control units and motor drive feedback paths |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional, unmarked case with no polarity indicator. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002/JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bidirectional structure allows identical clamping in both directions; no cathode band marking required |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; thermal resistance RθJA = 72 °C/W on 5.0 mm × 5.0 mm Cu pads |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term VBR stability and reduced parameter drift over 15-year automotive service life |
| MSL Level 1 rating | Enables single-pass reflow without moisture-induced popcorning; no bake preconditioning required |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V/5 V logic and CAN transceivers |
| AEC-Q101 qualification | Validates robustness for automotive applications including powertrain, body electronics, and ADAS sensors |
| RoHS-compliant matte tin leads | Supports lead-free assembly while maintaining solder joint reliability and whisker resistance (JESD 201 Class 2) |
Applications
| Automotive Sensor Protection | Industrial Digital I/O |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed directly at connector entry point, diverting surge energy to ground before reaching ASIC input pins. Use Value: Prevents latch-up and gate oxide damage in 5 V-tolerant sensor interfaces while maintaining <1 µA leakage at 8.5 V operating bias. | Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring exposed to relay coil kickback and ESD events. IC Role / Device Role / Timing Role: Bidirectional voltage limiter installed between signal line and chassis ground, absorbing ±1 kV EFT bursts per IEC 61000-4-4. Use Value: Enables reliable operation without external series impedance, preserving signal edge rate and reducing BOM count versus RC+TVS solutions. |
| USB Port ESD Protection | Motor Drive Feedback Line Protection |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in infotainment head units, supplementing internal transceiver clamps. IC Role / Device Role / Timing Role: Low-capacitance (CJ ≈ 200 pF at 0 V) bidirectional TVS placed adjacent to connector to suppress ±15 kV contact discharge (IEC 61000-4-2). Use Value: Clamps transients to <14.4 V within picoseconds, preventing data corruption and PHY latch-up without degrading 480 Mbps signal integrity. | Use Scenario: Shielding encoder quadrature signals (A/B/Z) and Hall-effect feedback lines in BLDC motor drives from commutation noise and back-EMF coupling. IC Role / Device Role / Timing Role: Fast-response shunt protector mounted at PCB edge near motor connector, limiting induced surges to safe levels for microcontroller GPIO inputs. Use Value: Maintains position accuracy by avoiding false edge detection during 800 W surge events, supported by stable VBR across -40 °C to +125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-E3/52 | Same VWM/VBR/VC specs but rated for 600 W PPPM (vs. 800 W); lower IPPM (30 A vs. 40 A) | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); not recommended for ISO 7637-2 Pulse 5a | Select SMB8J8.5CA-E3/52 when protecting high-surge-risk nodes like battery-connected sensors or motor feedback lines |
| SMCJ8.5CA-E3/52 | Same electrical specs but in larger SMC (DO-214AB) package; higher thermal mass (RθJA = 35 °C/W vs. 72 °C/W) | Better sustained power handling; requires larger PCB area and may not fit space-constrained automotive modules | Choose SMCJ8.5CA-E3/52 only if board layout permits 7.1 mm × 6.2 mm footprint and thermal derating below 125 °C is critical |
Compared with SMBJ8.5CA-E3/52 and SMCJ8.5CA-E3/52, SMB8J8.5CA-E3/52 delivers optimal balance of high 800 W surge capacity, compact SMB footprint, and AEC-Q101 compliance - making it the preferred choice for space-limited, high-reliability automotive and industrial signal-line protection where 40 A peak surge immunity is required.
Availability
SMB8J8.5CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB port hardening, and motor drive feedback protection requiring stable component supply and full traceability.
Supply support for SMB8J8.5CA-E3/52 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8J series is part of Vishay's TRANSZORB® TVS platform engineered specifically for high-power-density, AEC-Q101-qualified transient suppression in automotive and industrial environments where compact size and repeatable clamping performance are essential.
FAQ
What is the clamping voltage of SMB8J8.5CA-E3/52 at its rated peak pulse current?
The SMB8J8.5CA-E3/52 has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated 40 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures downstream circuitry remains within safe overvoltage limits during surge events. The SMB8J8.5CA-E3/52 maintains this clamping performance across its full operating temperature range.
Is SMB8J8.5CA-E3/52 qualified for automotive applications?
Yes, SMB8J8.5CA-E3/52 is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including engine control, body electronics, and ADAS sensor modules. The qualification covers stress tests such as high-temperature reverse bias, temperature cycling, and ESD robustness. As an AEC-Q101 device, SMB8J8.5CA-E3/52 meets the reliability requirements for under-hood and cabin-mounted applications where long-term stability and failure-free operation are mandatory.
What is the standoff voltage (VWM) and why is it important for SMB8J8.5CA-E3/52?
The standoff voltage (VWM) of SMB8J8.5CA-E3/52 is 8.5 V - the maximum DC or continuous reverse working voltage the device can withstand without entering avalanche conduction. This parameter establishes the design margin between normal system operation and transient activation, ensuring minimal leakage (<1.0 µA) during steady-state conditions. For SMB8J8.5CA-E3/52, VWM = 8.5 V allows safe integration into 9–12 V automotive signal paths and 24 V industrial I/O lines with appropriate derating.
Does SMB8J8.5CA-E3/52 have polarity markings, and how is it mounted?
No, SMB8J8.5CA-E3/52 is a bidirectional TVS diode and carries no polarity marking - its symmetrical construction enables identical clamping behavior in both directions. It is mounted in the SMB (DO-214AA) package using standard SMT reflow processes, with recommended pad layout per Vishay specification: 5.0 mm × 5.0 mm copper pads per terminal. The device is MSL Level 1 compliant, supporting peak reflow temperatures up to 260 °C without preconditioning.
How does SMB8J8.5CA-E3/52 compare to unidirectional TVS diodes like SMB10J8.5A-E3/52?
SMB8J8.5CA-E3/52 is bidirectional with symmetrical clamping, whereas SMB10J8.5A-E3/52 is unidirectional and requires correct orientation relative to circuit polarity. SMB8J8.5CA-E3/52 offers 800 W PPPM and 40 A IPPM, while SMB10J8.5A-E3/52 provides 1000 W PPPM and 69.4 A IPPM but only in one direction. The SMB8J8.5CA-E3/52 is preferred for AC-coupled or differential signal lines (e.g., LIN, RS-485, encoder A/B), while SMB10J8.5A-E3/52 suits DC power rail protection where polarity is fixed and higher single-direction surge capacity is needed.
SMB8J8.5CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 55.6A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J8.5CA-E3/52 FAQ
1.How can I place an order for SMB8J8.5CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CA-E3/52 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 SMB8J8.5CA-E3/52 reliable?
The price and inventory of SMB8J8.5CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J8.5CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CA-E3/52?
SMB8J8.5CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CA-E3/52 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 SMB8J8.5CA-E3/52?
For technical support, including SMB8J8.5CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J8.5CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CA-E3/52 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 SMB8J8.5CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CA-E3/52?
All SMB8J8.5CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CA-E3/52, 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 SMB8J8.5CA-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J8.5CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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