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STMicroelectronics SMC50J23CA
- Part No.:
- SMC50J23CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J23CA.pdf
- Description:
- Linear IC's
- Quantity:
- Payment:
- Shipping:
Inventory:7,778
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Product details
Overview
SMC50J23CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in power rails and signal lines. It delivers 5000 W peak pulse power (10/1000 μs), clamps at 37.8 V (max) under 135 A surge current, and operates up to 175 °C junction temperature - enabling robust protection in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMC50J23CA datasheet, SMC50J23CA pinout, SMC50J23CA application, or SMC50J23CA equivalent, key selection criteria include its 23 V standoff voltage, bidirectional polarity, low 0.2 µA leakage at 25 °C, JEDEC-registered SMC package, and compliance with IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 Level 4 (4 kV).
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide fast response (<1 ns) to electrostatic discharge and repetitive surges. Its bidirectional configuration enables symmetric clamping on AC-coupled or floating lines without polarity dependency.
The device features a dynamic resistance of 9.6 mΩ at 8/20 μs, enabling low clamping voltage rise under high-current transients, and exhibits stable VBR drift (αT = 10⁻⁴ /°C) across its −55 °C to +175 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 23 V - maximum continuous reverse working voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 25.7–28.4 V at 1 mA - ensures reliable triggering above normal operating rail |
| Clamping Voltage (VCL) | 37.8 V max at 135 A (10/1000 μs) - limits downstream voltage stress during surge events |
| Peak Pulse Power | 5000 W (10/1000 μs); up to 784 W at 8/20 μs - defines energy-handling capability per waveform |
| Leakage Current (IR) | 0.2 µA at 23 V and 25 °C - minimizes standby power loss in battery-backed or low-power systems |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive, industrial SMPS, and outdoor equipment |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 immunity requirements |
Pinout & Package
SMC50J23CA is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and thermal reliability on FR4 PCBs. The package measures 5.55–6.25 mm × 7.75–8.15 mm × 2.45 mm max height and supports IPC-7531 footprint recommendations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode-bar side) | Transient return path (bidirectional) | Identified by cathode bar marking; serves as common reference for symmetrical clamping |
| Cathode (opposite side) | Transient return path (bidirectional) | Electrically identical to anode in bidirectional configuration; no polarity sensitivity |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection on AC, differential, or floating lines without external polarity management |
| Low dynamic resistance (9.6 mΩ) | Reduces clamping voltage overshoot during fast-rising 8/20 μs surges, improving system margin |
| High-temperature operation (Tj ≤ 175 °C) | Supports placement near heat sources (e.g., MOSFETs, inductors) in compact power designs |
| JEDEC-compliant SMC outline | Ensures mechanical compatibility with standard pick-and-place equipment and reflow profiles |
| UL94 V-0 flammability rating | Meets safety requirements for enclosed industrial and consumer end-equipment enclosures |
Applications
| Industrial Motor Drives | Telecom DC Power Distribution |
|---|---|
|
Use Scenario: Protection of 24 V DC input rails against load-dump transients and relay-switching spikes in PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surge energy before reaching DC-DC converters. Use Value: 37.8 V clamping ensures downstream 24 V-rated regulators remain within absolute maximum ratings during 135 A surges. |
Use Scenario: Input-stage surge suppression on −48 V telecom power feeds exposed to lightning-induced surges in central office equipment. IC Role / Device Role / Timing Role: Primary overvoltage clamp on feed line, coordinated with upstream fuses and secondary filtering. Use Value: 5000 W (10/1000 μs) rating handles long-duration surges typical in telecom infrastructure grounding scenarios. |
| Automotive Body Control Units | Industrial Ethernet PHY Interfaces |
|
Use Scenario: CAN FD and LIN bus line protection in BCMs subjected to ISO 7637-2 pulse 1/2a/3a and ESD events. IC Role / Device Role / Timing Role: Secondary-level TVS after common-mode chokes, providing low-leakage, high-temp clamping on data lines. Use Value: 0.2 µA leakage preserves signal integrity and reduces quiescent current in always-on vehicle networks. |
Use Scenario: Surge protection on RJ45 magnetics secondary side in PoE-powered industrial switches operating in factory environments. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground clamp on isolated 10/100/1000BASE-T differential pairs. Use Value: Bidirectional symmetry ensures equal clamping on both polarities of differential signals without skew or imbalance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ23CA (STMicroelectronics) | Lower peak power: 600 W (10/1000 μs); same VRWM, VCL, and bidirectional topology | Suitable only for lower-energy threats (e.g., board-level ESD), not line surges | Select when space constraints require SMB package and surge threat level is limited to IEC 61000-4-2 only |
| SAC23CA (Littelfuse) | Same 23 V VRWM, but higher VCL (42.1 V @ 135 A) and lower Tj max (150 °C) | Marginally lower clamping performance; reduced thermal headroom in high-ambient designs | Acceptable where legacy Littelfuse sourcing is preferred and 4.3 V higher clamping is tolerable |
Compared with SMBJ23CA and SAC23CA, SMC50J23CA provides superior energy handling (5000 W vs. 600 W or ~3000 W), tighter clamping (37.8 V vs. 42.1 V), and extended junction temperature capability (+175 °C), making it optimal for high-reliability industrial and automotive power rail protection.
Availability
SMC50J23CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom DC power distribution, automotive body control units, and industrial Ethernet PHY interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMC50J23CA 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, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The SMC50J series belongs to ST's high-power TVS portfolio, engineered specifically for robust front-end surge protection in harsh-environment power conversion and communication systems where reliability under repeated overstress is critical.
FAQ
What is the difference between SMC50J23A and SMC50J23CA?
SMC50J23A is unidirectional (anode-cathode polarity), intended for DC rail protection where surge direction is known; SMC50J23CA is bidirectional, with symmetrical clamping for AC, differential, or floating lines. Both share identical VRWM, VCL, and power ratings, but differ in marking (cathode bar present on unidirectional only) and circuit placement flexibility.
Can SMC50J23CA be used in parallel for higher surge current handling?
No - ST does not recommend paralleling discrete TVS diodes due to mismatched VBR and dynamic resistance, which causes uneven current sharing and potential thermal runaway. For higher current, select a single higher-rated device (e.g., SMC50J33CA) or use a dedicated multi-channel TVS array.
What is the recommended PCB footprint for SMC50J23CA?
The official ST-recommended footprint is 5.11 mm × 8.19 mm pad length with 3.14 mm center-to-center spacing, matching IPC-7531 Class B for SMC packages. Copper area under each lead should exceed 1 cm² per side to maintain Rth(j-a) ≤ 100 °C/W and sustain 175 °C junction temperature during surge events.
Does SMC50J23CA meet AEC-Q200 for automotive use?
SMC50J23CA is not AEC-Q200 qualified; however, its −55 °C to +175 °C operating range, robust surge ratings, and JEDEC MSL Level 1 packaging make it widely deployed in non-safety-critical automotive applications (e.g., body electronics, infotainment power rails) where qualification is customer-defined rather than mandated.
SMC50J23CA 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):
- 23V (Max)
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.8V
- Current - Peak Pulse (10/1000µs):
- 135A
- 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
SMC50J23CA FAQ
1.How can I place an order for SMC50J23CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J23CA 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 SMC50J23CA reliable?
The price and inventory of SMC50J23CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J23CA is usually 5 days.
3.What payment methods are accepted for SMC50J23CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J23CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J23CA?
SMC50J23CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J23CA 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 SMC50J23CA?
For technical support, including SMC50J23CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J23CA requirements.
6.How does Aetrix verify that SMC50J23CA is sourced from the original manufacturer or authorized distributors?
All SMC50J23CA 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 SMC50J23CA meets industry standards.
7.What is the process for return or replacement of SMC50J23CA?
All SMC50J23CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J23CA, 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 SMC50J23CA part is unused and in its original packaging.
Return procedure for SMC50J23CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J23CA Tags
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