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Vishay General Semiconductor - Diodes Division SMBJ8.5CA/54
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- Part No.:
- SMBJ8.5CA/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CA/54.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,262
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Product details
Overview
SMBJ8.5CA/54 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, 14.4 V maximum clamping voltage (VC) at 41.7 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ8.5CA/54 datasheet, SMBJ8.5CA/54 pinout, SMBJ8.5CA/54 application, or SMBJ8.5CA/54 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped surge protector using an avalanche junction. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity concerns. The glass-passivated chip junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
Thermal performance is defined by RθJA = 100 °C/W and RθJL = 20 °C/W, with derating required above TA = 25 °C per Figure 2. It meets UL 497B recognition (QVGQ2) and supports AEC-Q101 qualification when ordered with HE3/HM3 suffixes - though SMBJ8.5CA/54 itself is commercial-grade (E3/M3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during transients. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamping voltage under 10/1000 µs surge; limits downstream device stress to ≤14.4 V. |
| PPPM | 600 W - Peak pulse power handling capacity; supports repetitive surges at 0.01 % duty cycle. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - Maximum junction temperature rating enables operation in high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount 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. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per datasheet Fig. 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Acts as cathode during positive transients; accepts surge current from either polarity direction. |
| Cathode | Transient current entry (bidirectional) | Acts as anode during negative transients; completes low-impedance path to ground or rail during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs-critical for 3.3 V or 5 V logic interfaces. |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow at 260 °C peak without baking-reduces manufacturing overhead. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage across temperature and lifetime cycling. |
| UL 497B recognized (QVGQ2) | Validates suitability for telecom and industrial surge protection systems requiring safety certification. |
Applications
| Industrial Motor Control Inputs | Automotive Sensor Signal Lines |
|---|---|
Use Scenario: Protection of PLC digital input modules against inductive kickback from solenoid or relay coils. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground to clamp ±1 kV transients. Use Value: Prevents latch-up or gate oxide damage in input buffer ICs while maintaining <1 µA leakage at 8.5 V nominal bus voltage. |
Use Scenario: ESD and load-dump suppression on LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control units. IC Role / Device Role / Timing Role: Standoff-rated clamping device co-located with connector to shunt fast transients before reaching ASIC front-end. Use Value: 14.4 V clamping ensures downstream 12 V tolerant receivers remain within safe operating area during ISO 7637-2 Pulse 1/2a events. |
| Telecom Line Interface Cards | Consumer USB-C Port Protection |
Use Scenario: Secondary protection on Ethernet PHY or xDSL line drivers exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response TVS in parallel with primary GDT or polymer PTC to limit let-through voltage. Use Value: Sub-15 V clamping prevents damage to 2.5 V/3.3 V PHY transceivers while sustaining 600 W pulses per IEEE C62.41. |
Use Scenario: Bidirectional overvoltage guard on USB-C CC and VCONN lines susceptible to hot-plug transients and miswiring. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor placed directly at port connector to minimize stub length. Use Value: 8.5 V VWM aligns with USB-C specification's 5 V ±10 % tolerance; 14.4 V VC avoids false triggering of VBUS detection logic. |
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 electrical specs; differs only in packaging (7" tape/reel, 750 pcs) and RoHS compliance code (E3 vs /54's unspecified base code). | No functional difference; suitable for same PCB layouts and thermal designs. | Select SMBJ8.5CA/54 for standard distribution quantities; choose SMBJ8.5CA-E3/52 when traceability to Vishay's commercial-grade E3 material categorization is required. |
| SAC8.5CA | Same VWM (8.5 V), but lower PPPM (400 W), higher VC (15.0 V), and SMA package (smaller footprint, higher RθJA). | Less robust for high-energy surges; better suited for space-constrained consumer boards where 400 W suffices. | Use SAC8.5CA only if board area is critical and surge threat level is limited to IEC 61000-4-2 ESD (±8 kV contact), not full lightning surges. |
Compared with SMBJ8.5CA/54, SMBJ8.5CA-E3/52 offers identical protection performance with documented RoHS compliance, while SAC8.5CA trades pulse power and thermal margin for smaller size-making SMBJ8.5CA/54 the preferred choice for industrial-grade surge resilience.
Availability
SMBJ8.5CA/54 is available at Aetrix Electronics and suitable for industrial motor control inputs, automotive sensor signal lines, telecom line interface cards, and consumer USB-C port protection requiring stable component supply and repeatable surge performance.
Supply support for SMBJ8.5CA/54 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 and application-specific validation.
The SMBJ series was engineered for high-reliability transient suppression in harsh environments, targeting industrial automation, automotive subsystems, and infrastructure communications where consistent clamping and long-term stability are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ8.5CA/54 under a 10/1000 µs surge?
The SMBJ8.5CA/54 has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream circuitry.
Is SMBJ8.5CA/54 unidirectional or bidirectional?
SMBJ8.5CA/54 is a bidirectional Transient Voltage Suppressor, as indicated by the "CA" suffix per Vishay's naming convention. It provides symmetrical clamping for both positive and negative transients, with no polarity marking on the SMB package-making it ideal for AC-coupled or differential signal protection without orientation constraints.
Does SMBJ8.5CA/54 meet automotive qualification standards?
SMBJ8.5CA/54 is a commercial-grade part and is not AEC-Q101 qualified. However, Vishay offers AEC-Q101 variants under ordering codes such as SMBJ8.5CAHE3_B/H (HE3 suffix), which share identical electrical specs but add automotive-grade process controls and testing. SMBJ8.5CA/54 itself is intended for industrial and telecom use.
What is the thermal resistance from junction to ambient for SMBJ8.5CA/54?
The typical thermal resistance from junction to ambient (RθJA) for SMBJ8.5CA/54 is 100 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). This value assumes still air conditions and is used to calculate junction temperature rise under steady-state power dissipation or repetitive surge conditions.
Can SMBJ8.5CA/54 be used in place of SMBJ8.5A?
No-SMBJ8.5CA/54 and SMBJ8.5A are functionally distinct: the former is bidirectional (CA), the latter unidirectional (A). Substituting SMBJ8.5CA/54 for SMBJ8.5A would eliminate polarity-dependent forward conduction behavior and may compromise protection in DC-biased circuits. Always match suffix type (A vs CA) to system topology requirements.
SMBJ8.5CA/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- 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/54 FAQ
1.How can I place an order for SMBJ8.5CA/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CA/54 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/54 reliable?
The price and inventory of SMBJ8.5CA/54 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/54 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CA/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CA/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CA/54?
SMBJ8.5CA/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CA/54 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/54?
For technical support, including SMBJ8.5CA/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CA/54 requirements.
6.How does Aetrix verify that SMBJ8.5CA/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CA/54 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/54 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CA/54?
All SMBJ8.5CA/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CA/54, 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/54 part is unused and in its original packaging.
Return procedure for SMBJ8.5CA/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CA/54 Tags
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