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Vishay General Semiconductor - Diodes Division SMBJ8.5CA-E3/52
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- Part No.:
- SMBJ8.5CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CA-E3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,530
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Product details
Overview
SMBJ8.5CA-E3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in 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, and clamps to ≤14.4 V at 41.7 A peak pulse current (IPPM) under 10/1000 μs waveform - protecting MOSFETs, ICs, and sensor interfaces in industrial and telecom systems.
For engineers reviewing the SMBJ8.5CA-E3/52 datasheet, SMBJ8.5CA-E3/52 pinout, SMBJ8.5CA-E3/52 application, or SMBJ8.5CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, 600 W peak pulse power rating, low clamping ratio (VC/VBR ≈ 1.45), and RoHS-compliant commercial-grade packaging with MSL Level 1 moisture sensitivity.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling suppression of positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced surges.
The SMBJ8.5CA-E3/52 is rated for 600 W peak pulse power (10/1000 μs), derated linearly above 25 °C ambient per Fig. 2, and maintains operation across -55 °C to +150 °C junction temperature range. Thermal resistance (RθJA = 100 °C/W) reflects standard PCB pad layout (0.2" × 0.2" copper per terminal), not enhanced heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 9.44–10.4 V at IT = 1 mA - guaranteed avalanche onset range; ensures reliable triggering during overvoltage events |
| VC (Clamping Voltage) | ≤14.4 V at IPPM = 41.7 A - peak voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components |
| PPPM (Peak Pulse Power) | 600 W - maximum transient energy absorption capability under standardized 10/1000 μs waveform; defines surge robustness class |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - minimal DC loading on signal/power line during normal operation; preserves signal integrity and power efficiency |
| TJ max. | +150 °C - maximum junction temperature; enables use in high-ambient environments such as industrial motor drives or outdoor telecom enclosures |
| Package | SMB (DO-214AA) - surface-mount outline with 0.205" × 0.130" footprint; compatible with automated placement and reflow soldering per J-STD-020 MSL Level 1 |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional configuration - terminals are electrically symmetric with no anode/cathode designation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient Input / Line Side | Connects to unprotected signal or power line subject to ESD, inductive switching, or lightning surges |
| Terminal 2 | Transient Return / Ground or Reference Side | Connects to local ground plane or reference node; completes clamping path during bidirectional overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN, USB D+/D− |
| 600 W peak pulse power | Meets IEC 61000-4-5 Level 3 (1 kV surge) requirements when applied with proper PCB layout and trace impedance |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift due to humidity or thermal cycling in harsh environments |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile compatibility - no baking required prior to assembly |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU and China RoHS II; contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE |
Applications
| Industrial Motor Control | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback signal lines in variable-frequency drives exposed to inductive kickback from contactors and solenoids. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across isolated gate drive transformer secondary or analog sensor output traces. Use Value: Limits transient voltage to ≤14.4 V, preventing latch-up or oxide breakdown in 3.3 V/5 V microcontrollers and isolated amplifiers. |
Use Scenario: Surge protection on LIN bus or analog pressure/temperature sensor outputs in engine control modules. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on sensor harness entry point, upstream of ESD diode arrays and filtering RC networks. Use Value: Absorbs 600 W pulses without degradation, maintaining signal fidelity while meeting ISO 7637-2 Pulse 1/2a immunity requirements. |
| Telecom Power Feeds | Consumer USB-C Port Protection |
|
Use Scenario: Secondary-side overvoltage clamping on -48 V DC power distribution rails feeding remote radio units and baseband processors. IC Role / Device Role / Timing Role: Fast-response shunt protector parallel to bulk capacitance, triggered within nanoseconds of surge onset. Use Value: Clamps 10/1000 μs surges to <14.4 V, safeguarding 12 V and 3.3 V LDO regulators and PMICs downstream of DC/DC converters. |
Use Scenario: Bidirectional transient suppression on USB-C CC and SBU lines susceptible to hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: First-line defense against ±15 kV contact ESD (IEC 61000-4-2) on low-capacitance data paths. Use Value: Delivers sub-1 ns response with <1.0 μA leakage at 8.5 V, preserving signal integrity while meeting USB-IF compliance thresholds. |
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-M3/52 | Halogen-free variant with identical electrical specs and SMB package; same VWM, VBR, VC, and PPPM ratings | Required where halogen-free material compliance (e.g., IEC 61249-2-21) is mandated in aerospace or green procurement programs | Select when environmental compliance mandates absence of brominated flame retardants - no design or layout changes needed |
| SMCJ8.5CA-E3/52 | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; higher thermal mass yields RθJA = 50 °C/W vs. 100 °C/W | Better suited for high-repetition-rate surges or elevated ambient temperatures (>85 °C) where SMB thermal limits are exceeded | Choose when sustained surge duty cycle or board-level thermal constraints require lower junction-to-ambient resistance |
Compared with SMBJ8.5CA-E3/52, the M3 variant offers identical protection performance with halogen-free construction, while the SMCJ8.5CA-E3/52 provides superior thermal handling in thermally demanding layouts - neither is pin-compatible due to differing package footprints, requiring PCB revision for substitution.
Availability
SMBJ8.5CA-E3/52 is available at Aetrix Electronics and suitable for industrial motor control, automotive sensor interface, telecom power feeds, and consumer USB-C port protection requiring stable component supply and full RoHS compliance.
Supply support for SMBJ8.5CA-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, precision, and application-specific optimization.
The SMBJ series targets cost-sensitive, high-volume transient suppression needs in consumer, industrial, and telecom equipment - optimized for automated assembly, low-profile PCBs, and robust surge immunity without external biasing.
FAQ
What does the "CA" suffix indicate in SMBJ8.5CA-E3/52?
The "CA" suffix denotes a bidirectional configuration: SMBJ8.5CA-E3/52 conducts and clamps symmetrically for both positive and negative transients, unlike unidirectional variants (e.g., SMBJ8.5A) that only protect one polarity. This makes SMBJ8.5CA-E3/52 ideal for AC-coupled lines, differential buses, or floating references where polarity is undefined or alternating.
Is SMBJ8.5CA-E3/52 suitable for IEC 61000-4-2 ESD protection?
SMBJ8.5CA-E3/52 is rated for fast transient suppression but is not optimized for direct IEC 61000-4-2 contact ESD (±8 kV/±15 kV). Its 10/1000 μs response suits surge events (IEC 61000-4-5), while dedicated low-capacitance ESD arrays are recommended upstream for ESD. SMBJ8.5CA-E3/52 serves best as secondary protection after initial ESD clamping.
What is the maximum operating temperature for SMBJ8.5CA-E3/52?
The SMBJ8.5CA-E3/52 has a maximum junction temperature (TJ max.) of +150 °C and operates from -55 °C to +150 °C. At ambient temperatures above 25 °C, its peak pulse power must be derated per Figure 2 in the datasheet - for example, at TA = 85 °C, PPPM drops to approximately 300 W due to thermal limitations.
Does SMBJ8.5CA-E3/52 require a heatsink for standard operation?
No heatsink is required for SMBJ8.5CA-E3/52 under typical single-pulse conditions. Its RθJA = 100 °C/W assumes mounting on 0.2" × 0.2" copper pads per terminal - sufficient for 600 W pulses with 0.01% duty cycle. Continuous power dissipation is limited to 5.0 W, so sustained surges demand careful thermal design or derating, not added heatsinking.
How does the clamping voltage VC of SMBJ8.5CA-E3/52 compare to its breakdown voltage VBR?
For SMBJ8.5CA-E3/52, VBR ranges from 9.44 V to 10.4 V at 1 mA, while VC is specified as ≤14.4 V at 41.7 A (10/1000 μs). This yields a clamping ratio (VC/VBR) of ~1.38–1.53, indicating efficient voltage limiting with minimal overshoot - critical for protecting 12 V or lower logic supplies without overstressing downstream ICs.
SMBJ8.5CA-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):
- 41.7A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ8.5CA-E3/52 FAQ
1.How can I place an order for SMBJ8.5CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CA-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 SMBJ8.5CA-E3/52 reliable?
The price and inventory of SMBJ8.5CA-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 SMBJ8.5CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CA-E3/52?
SMBJ8.5CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CA-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 SMBJ8.5CA-E3/52?
For technical support, including SMBJ8.5CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ8.5CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CA-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 SMBJ8.5CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CA-E3/52?
All SMBJ8.5CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CA-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 SMBJ8.5CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CA-E3/52 Tags
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