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STMicroelectronics SMC50J24A
- Part No.:
- SMC50J24A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J24A.pdf
- Description:
- 5000 W, 24 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,480
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Product details
Overview
SMC50J24A from STMicroelectronics is a unidirectional 24 V standoff voltage TVS diode in SMC package, designed for IEC 61000-4-2 ESD (±30 kV air/contact) and IEC 61000-4-4 surge (4 kV level 4) protection of DC power rails and signal lines. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 38.9 V @ 129 A, and operates up to 175 °C junction temperature - ideal for industrial power supplies and automotive body electronics.
For engineers reviewing the SMC50J24A datasheet, SMC50J24A pinout, SMC50J24A application, or SMC50J24A equivalent, this page provides verified electrical parameters, JEDEC-compliant SMC package details, real-world clamping behavior under 8/20 µs surges, and validated alternatives for high-reliability overvoltage protection design.
Technical Context
The SMC50J24A uses planar silicon avalanche technology to achieve low leakage (0.2 µA @ 25 °C) and stable breakdown at 26.7–29.5 V (min–max VBR), with dynamic resistance of 27.0 mΩ enabling precise clamping during fast transients. Its thermal design supports continuous operation at Tj = 175 °C, critical for enclosed power converters.
It complies with IEC 61000-4-2 (±30 kV), IEC 61000-4-4 (4 kV level 4), and MIL-STD-883 Method 3015, making it suitable for front-end protection where low capacitance (<100 pF typical) and high surge robustness are jointly required - unlike polymer-based or MOV solutions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 24 V - maximum continuous reverse working voltage before conduction begins. |
| Breakdown Voltage (VBR) | 26.7–29.5 V @ 1 mA - ensures reliable triggering above nominal rail while avoiding false trips. |
| Clamping Voltage (VCL) | 38.9 V @ 129 A (10/1000 µs) - limits downstream voltage stress during surge events. |
| Peak Pulse Power | 5000 W (10/1000 µs) - sustains high-energy transients without failure in industrial environments. |
| Leakage Current | 0.2 µA @ 24 V, 25 °C - minimizes standby power loss in battery-backed or energy-sensitive systems. |
| Junction Temperature Range | −55 to +175 °C - enables deployment in under-hood automotive or high-ambient industrial enclosures. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact & air) - exceeds level 4 immunity for human-body-model discharge events. |
Pinout & Package
SMC50J24A is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with matte tin-plated leads, compatible with IPC-7531 footprint and reflow profiles per J-STD-020 MSL level 1. The device has two terminals: anode and cathode, marked by a cathode bar on the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lower-potential node; defines current path during reverse-biased surge clamping. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V rail); carries full surge current into anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Planar avalanche structure | Enables tight VBR tolerance (±5%) and stable clamping across temperature (αT = 10−4/°C). |
| Low dynamic resistance | 27.0 mΩ - reduces VCL rise under high-current pulses, improving system-level surge margin. |
| High-temperature operation | Rated to 175 °C Tj - eliminates derating in thermally constrained PCB layouts near power components. |
| JEDEC-registered SMC outline | Ensures mechanical compatibility with automated placement and standard reflow profiles (peak 240–245 °C). |
| UL94 V0 flammability rating | Confirms non-propagating flame behavior in enclosure-integrated designs meeting safety standards. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against field-induced surges and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground to clamp transients before reaching optocoupler or MCU GPIO. Use Value: Clamps 129 A surges to ≤38.9 V, preserving input circuit integrity without sacrificing response time (<1 ns). |
Use Scenario: Safeguarding LIN bus power supply lines and sensor inputs in vehicle door modules exposed to load dump and ESD. IC Role / Device Role / Timing Role: Front-end transient suppressor on 12–24 V supply rail feeding microcontroller and CAN/LIN transceivers. Use Value: Withstands 175 °C ambient and ±30 kV ESD, ensuring reliability in under-dash thermal environments. |
| Telecom Power Feeds | Medical Equipment DC Rails |
|
Use Scenario: Overvoltage protection on −48 V telecom power distribution boards subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (paired with polarity reversal) on primary DC feed lines. Use Value: 5000 W 10/1000 µs rating handles multi-kA induced surges while maintaining <0.2 µA leakage for low-noise monitoring circuits. |
Use Scenario: Protecting isolated 24 V auxiliary rails powering analog front-ends and patient-monitoring sensors. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated DC output to prevent transient coupling into sensitive analog signal chains. Use Value: Low capacitance (<100 pF) avoids signal distortion; UL94 V0 compliance supports Class II medical enclosure requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A (STMicroelectronics) | Same VRWM (24 V), but lower PPP = 600 W (SMB package); higher VCL = 38.9 V @ 15.4 A. | Limited to lower-energy surges; unsuitable for 5000 W IEC 61000-4-4 applications. | Select only when space constraints prohibit SMC and surge energy is ≤600 W. |
| 1.5KE24A (ON Semiconductor) | Higher VCL = 38.7 V @ 129 A, but axial DO-201 package; no MSL level 1 rating; 175 °C Tj not guaranteed. | Not suitable for automated SMT assembly; lacks IEC 61000-4-2 certification data. | Use only in legacy through-hole designs where rework tolerance outweighs surge consistency. |
Compared with SMBJ24A and 1.5KE24A, SMC50J24A uniquely combines 5000 W surge capability, SMT-compatible JEDEC SMC packaging, MSL level 1 handling, and full IEC 61000-4-2/4-4 validation - making it the only drop-in solution for high-reliability, high-volume industrial SMT production.
Availability
SMC50J24A is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, telecom power feeds, and medical equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMC50J24A 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 analog, power, and discrete components for industrial, automotive, and consumer markets.
The SMC50J series belongs to ST's high-power TVS diode product line, engineered specifically for robust front-end overvoltage protection in harsh electromagnetic environments where reliability, temperature stability, and standardized packaging are mandatory.
FAQ
What is the maximum clamping voltage of SMC50J24A under a 10/1000 µs surge?
The maximum clamping voltage is 38.9 V at 129 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases slightly with junction temperature due to the positive temperature coefficient (αT = 10−4/°C), reaching ~40.5 V at 125 °C.
Can SMC50J24A be used in bidirectional protection circuits?
No - SMC50J24A is unidirectional and must be used with correct polarity (cathode toward protected line). For bidirectional protection, use the pin-compatible SMC50J24CA variant, which features symmetrical breakdown in both directions and identical clamping performance.
Does SMC50J24A meet automotive AEC-Q200 requirements?
SMC50J24A is not AEC-Q200 qualified. While it operates up to 175 °C and passes IEC 61000-4-2/4-4, it lacks the extended temperature cycling, vibration, and humidity testing required for automotive qualification. ST offers AEC-Q200 variants in the SMAJ/SMBJ families for such applications.
What is the recommended PCB footprint for SMC50J24A?
The recommended footprint follows IPC-7531 and JEDEC MO-213, with pad dimensions of 5.11 mm × 1.54 mm (length × width) and 3.14 mm center-to-center spacing. Copper area under each lead should exceed 2 cm² to maintain Rth(j-a) ≤ 100 °C/W and sustain 175 °C operation.
SMC50J24A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC50J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V (Max)
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 129A
- 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
SMC50J24A FAQ
1.How can I place an order for SMC50J24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J24A 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 SMC50J24A reliable?
The price and inventory of SMC50J24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J24A is usually 5 days.
3.What payment methods are accepted for SMC50J24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J24A?
SMC50J24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J24A 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 SMC50J24A?
For technical support, including SMC50J24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J24A requirements.
6.How does Aetrix verify that SMC50J24A is sourced from the original manufacturer or authorized distributors?
All SMC50J24A 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 SMC50J24A meets industry standards.
7.What is the process for return or replacement of SMC50J24A?
All SMC50J24A units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J24A, 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 SMC50J24A part is unused and in its original packaging.
Return procedure for SMC50J24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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