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STMicroelectronics SMC50J8.5CA
- Part No.:
- SMC50J8.5CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J8.5CA.pdf
- Description:
- Linear IC's
- Quantity:
- Payment:
- Shipping:
Inventory:4,250
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Product details
Overview
SMC50J8.5CA from STMicroelectronics is a bidirectional 8.5 V standoff voltage TVS diode in SMC package, rated for 5000 W peak pulse power (10/1000 μs), 14.4 V clamping voltage at 1 A IPP, and 175 °C maximum junction temperature. It provides IEC 61000-4-2 ±30 kV ESD protection and IEC 61000-4-4 level 4 surge immunity for DC power rails in industrial PLC I/O modules.
For engineers reviewing the SMC50J8.5CA datasheet, SMC50J8.5CA pinout, SMC50J8.5CA application, or SMC50J8.5CA equivalent, key selection criteria include bidirectional clamping behavior, low leakage (≤0.2 µA at 25 °C), JEDEC-compliant SMC footprint compatibility, and thermal robustness up to 175 °C junction operation.
Technical Context
This device uses planar silicon avalanche technology to deliver precise reverse standoff voltage (VRM = 8.5 V) with tight VBR tolerance (9.4–10.4 V at 1 mA), enabling reliable overvoltage clamping on sensitive analog and digital signal lines. Its dynamic resistance (RD = 4.80 mΩ) and low capacitance (<1000 pF at 1 V) support high-speed transient suppression without signal integrity degradation.
The bidirectional configuration allows symmetric clamping for AC-coupled or floating interfaces, while its MSL Level 1 rating and matte tin lead finish ensure compatibility with standard reflow profiles and long-term solder joint reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 8.5 V - Maximum continuous reverse operating voltage before breakdown begins. |
| Clamping Voltage (VCL) | 14.4 V at 1 A (10/1000 μs) - Peak voltage seen by protected circuit during surge event. |
| Peak Pulse Power | 5000 W (10/1000 μs) - Sustained surge energy handling capability under standard waveform. |
| Leakage Current (IRM) | ≤0.2 µA at 25 °C - Minimal DC loading on bias rails, critical for low-power sensor interfaces. |
| Junction Temperature Range | −55 to +175 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - Exceeds level 4 requirements for user-accessible ports. |
| Package | SMC (DO-214AB) - JEDEC-registered surface-mount outline with 7.75–8.15 mm body width and 5.55–6.25 mm length. |
Pinout & Package
SMC50J8.5CA uses the standard SMC (DO-214AB) package: two-terminal, bidirectional device with cathode bar marking on one end. The package features matte tin-plated leads, JEDEC-compliant mechanical dimensions, and IPC7531-recommended footprint (8.19 mm × 5.11 mm pad spacing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient return path for negative surges | Provides symmetrical clamping when voltage reverses polarity across terminals. |
| Cathode (bar-marked side) | Transient return path for positive surges | Enables bidirectional protection without external polarity constraints on PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Supports AC-coupled lines and floating grounds without polarity-sensitive placement. |
| Low dynamic resistance (4.80 mΩ) | Minimizes clamping voltage rise under high-current transients, preserving downstream IC survival margin. |
| MSL Level 1 moisture sensitivity | Eliminates bake requirement prior to reflow, reducing manufacturing complexity and cost. |
| 175 °C max junction temperature rating | Enables use in high-ambient environments like power supply front-ends and motor control enclosures. |
| UL94 V0 flammability compliance | Meets safety standards for enclosed industrial and medical equipment housings. |
Applications
| Industrial PLC Analog Inputs | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 0–10 V or 4–20 mA analog input channels against field-induced surges and ESD events during sensor wiring. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed directly at connector entry point before signal conditioning amplifier. Use Value: Clamps transients to ≤14.4 V while maintaining <0.2 µA leakage, preventing ADC saturation and ensuring measurement accuracy over full temperature range. |
Use Scenario: Surge protection for LIN bus transceivers and interior lighting control outputs exposed to battery load dump and jump-start conditions. IC Role / Device Role / Timing Role: Secondary-level TVS on 12 V supply rail and LIN signal line, complementing primary front-end protection. Use Value: Withstands 5000 W pulses and operates up to 175 °C, matching under-dash thermal environment without derating. |
| Telecom Remote Radio Units | Smart Meter Communication Interfaces |
|
Use Scenario: ESD and lightning-induced surge protection for RS-485/RS-422 data lines connecting baseband unit to remote RF head in outdoor cell sites. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pair, placed adjacent to connector with controlled impedance trace routing. Use Value: ±30 kV ESD rating and <1000 pF capacitance preserve signal integrity up to 10 Mbps while surviving repeated surges. |
Use Scenario: Protection of HPLC (HomePlug AV) and NB-IoT modem interfaces in electricity meters subjected to utility grid switching transients. IC Role / Device Role / Timing Role: Primary clamping device on AC/DC converter output and communication PHY power rails. Use Value: 8.5 V VRM aligns with 9 V auxiliary supply rails; low leakage avoids meter calibration drift over 15-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA | Same VRM and bidirectional topology, but SMB package (smaller footprint, lower 600 W Ppp rating) | Limited to sub-1 kV surge environments; unsuitable for IEC 61000-4-4 level 4 deployments | Select only where board space is constrained and surge threat level is ≤1 kV (10/1000 μs). |
| 1.5KE8.5CA | Through-hole DO-201 package, identical electrical specs, higher 1500 W Ppp rating but no JEDEC SMC footprint | Requires manual assembly or wave soldering; incompatible with automated SMT lines | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMBJ8.5CA and 1.5KE8.5CA, SMC50J8.5CA uniquely delivers 5000 W surge capability in an SMT-compatible JEDEC SMC package with MSL Level 1 and 175 °C operation-enabling high-reliability automated production for industrial and automotive applications.
Availability
SMC50J8.5CA is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, telecom remote radio units, and smart meter communication interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMC50J8.5CA 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and protection components for industrial, automotive, and consumer markets.
SMC50J TVS series belongs to ST's high-power transient protection product line, engineered specifically for robust surge immunity in harsh-environment electronics where reliability, thermal resilience, and standardized SMT manufacturability are mandatory.
FAQ
What is the difference between SMC50J8.5A and SMC50J8.5CA?
SMC50J8.5A is unidirectional (anode-cathode polarity), intended for DC-biased lines where surge direction is known; SMC50J8.5CA is bidirectional (symmetrical clamping), used on AC-coupled, floating, or dual-polarity signal paths. Both share identical VRM, VCL, and power ratings, but differ in marking (EAP vs. EAP with cathode bar) and internal structure.
Does SMC50J8.5CA meet IEC 61000-4-5 requirements?
No-SMC50J8.5CA is rated for IEC 61000-4-4 (electrical fast transients) and IEC 61000-4-2 (ESD), not IEC 61000-4-5 (lightning surge). Its 5000 W rating applies to 10/1000 μs waveform, whereas IEC 61000-4-5 requires 1.2/50 μs open-circuit voltage and 8/20 μs current waveforms; higher-energy devices like SMAJ or SM8S series are needed for full 4-5 compliance.
Can SMC50J8.5CA be used in parallel for higher surge current handling?
Not recommended without derating analysis-minor VBR mismatches between units cause current imbalance, leading to premature failure of the lower-breakdown device. ST does not specify parallel operation in DS13845. For >1 A IPP, select a single higher-rated part such as SMC50J10CA or SMC50J12CA instead.
What is the thermal resistance (Rth j-a) of SMC50J8.5CA on standard FR4 PCB?
Per Figure 12 in DS13845, Rth j-a is 100 °C/W with 0 cm² copper area under each lead, improving to ~40 °C/W with 4.5 cm² total copper (2.25 cm² per pad). Actual value depends on PCB layout; ST recommends ≥3.14 mm² pad area per terminal and thermal vias to inner ground planes for optimal heat dissipation.
SMC50J8.5CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC50J
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V (Max)
- Voltage - Breakdown (Min):
- 9.4V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 348A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMC50J8.5CA FAQ
1.How can I place an order for SMC50J8.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J8.5CA 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 SMC50J8.5CA reliable?
The price and inventory of SMC50J8.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J8.5CA is usually 5 days.
3.What payment methods are accepted for SMC50J8.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J8.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J8.5CA?
SMC50J8.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J8.5CA 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 SMC50J8.5CA?
For technical support, including SMC50J8.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J8.5CA requirements.
6.How does Aetrix verify that SMC50J8.5CA is sourced from the original manufacturer or authorized distributors?
All SMC50J8.5CA 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 SMC50J8.5CA meets industry standards.
7.What is the process for return or replacement of SMC50J8.5CA?
All SMC50J8.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J8.5CA, 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 SMC50J8.5CA part is unused and in its original packaging.
Return procedure for SMC50J8.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J8.5CA Tags
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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