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STMicroelectronics SMC50J48A
- Part No.:
- SMC50J48A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J48A.pdf
- Description:
- 5000 W, 48 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:752
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Product details
Overview
SMC50J48A from STMicroelectronics is a unidirectional 48 V standoff voltage transient voltage suppressor (TVS) diode in SMC package, rated for 5000 W peak pulse power (10/1000 µs), 286 A peak pulse current, and 77.4 V clamping voltage at 100 A - designed to protect DC power rails and I/O lines in industrial power supplies and telecom infrastructure against IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 EFT (4 kV).
For engineers reviewing the SMC50J48A datasheet, SMC50J48A pinout, SMC50J48A application, or SMC50J48A equivalent, this device is selected for high-reliability surge protection where low leakage (0.2 µA @ 25 °C), high junction temperature operation (up to +175 °C), and JEDEC-compliant SMC footprint compatibility are critical design requirements.
Technical Context
The SMC50J48A employs planar silicon avalanche technology to deliver precise breakdown behavior with tight VBR tolerance (53.2–58.8 V at IBR = 1 mA) and low dynamic resistance (92.8 mΩ), enabling fast response (<1 ns) to transients while maintaining stable clamping under repeated stress. Its unidirectional configuration supports anode-grounded protection topologies common in positive-rail DC systems.
Thermal performance is optimized for high-power surges: maximum junction temperature reaches +175 °C, and thermal impedance (Zth(j-a)) drops below 100 °C/W on standard FR4 with recommended copper area, supporting robust long-term reliability in thermally constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 48 V - maximum continuous reverse operating voltage before significant leakage begins; sets upper limit for protected line voltage. |
| Breakdown Voltage (VBR) | 53.2–58.8 V @ 1 mA - defines precise avalanche onset; enables accurate margining against system overvoltage thresholds. |
| Clamping Voltage (VCL) | 77.4 V @ 100 A (10/1000 µs) - maximum voltage seen by downstream circuit during worst-case surge; determines required IC withstand rating. |
| Peak Pulse Power (PPP) | 5000 W @ 10/1000 µs - sustains high-energy transients without failure; validated per IEC 61000-4-4 Level 4. |
| Leakage Current (IR) | 0.2 µA @ 25 °C - negligible standby power loss; critical for battery-backed or ultra-low-power sensor nodes. |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in harsh environments including industrial motor drives and outdoor telecom cabinets. |
| Package | SMC (DO-214AB) - JEDEC-registered surface-mount outline with 7.75–8.15 mm body width; compatible with IPC-7531 footprint and automated assembly. |
Pinout & Package
SMC50J48A uses the standard SMC (DO-214AB) package: a two-terminal surface-mount device with cathode marked by a band. The package features matte tin-plated leads, JEDEC-compliant mechanical dimensions (E = 7.75–8.15 mm, D = 5.55–6.25 mm), and is rated MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Reference node for unidirectional clamping | Connected to ground or low-side return path; establishes polarity-sensitive protection direction. |
| Cathode (banded end) | Protected line connection | Connected to the line being protected (e.g., +48 V rail); conducts surge current to ground when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV air/contact discharge - exceeds Level 4, eliminating need for external ESD staging in front-end interfaces. |
| Low dynamic resistance | 92.8 mΩ - minimizes clamping voltage rise under high-current surges, improving protection margin for downstream ICs. |
| High-temperature operation | Rated to +175 °C junction - enables placement near heat sources (e.g., MOSFETs, inductors) without derating. |
| JEDEC-compliant SMC footprint | Validated IPC-7531 layout - ensures manufacturability across global CMMS and eliminates rework due to land pattern mismatch. |
| UL94 V0 flammability rating | Self-extinguishing epoxy body - satisfies safety requirements for enclosed industrial and telecom equipment. |
Applications
| Industrial DC Power Supplies | Telecom 48 V Backup Systems |
|---|---|
|
Use Scenario: Protection of primary-side 48 V input rails in DIN-rail mounted AC/DC converters exposed to lightning-induced surges on building wiring. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between +48 V and chassis ground, responding within <1 ns to divert >200 A transients. Use Value: Prevents damage to upstream rectifier bridges and downstream PMICs by limiting transient voltage to ≤77.4 V during 10/1000 µs events. |
Use Scenario: Surge suppression on battery backup inputs of 48 V telecom shelf controllers, subject to hot-swap transients and EFT bursts. IC Role / Device Role / Timing Role: Standoff-rated TVS connected directly at battery connector, absorbing repetitive 4 kV EFT pulses per IEC 61000-4-4. Use Value: Maintains system uptime by preventing latch-up or gate oxide rupture in load-switch MOSFETs during field-deployed maintenance operations. |
| Motor Drive Control Boards | Outdoor IoT Gateway Power Inputs |
|
Use Scenario: Protection of isolated 24–48 V auxiliary supply feeding encoder interfaces and Hall-effect sensors in variable-frequency drives. IC Role / Device Role / Timing Role: Low-leakage (0.2 µA) TVS placed at DC/DC converter input, minimizing standby current impact on control logic. Use Value: Ensures functional safety compliance (IEC 61800-5-1) by sustaining surge immunity across full temperature range (−40 °C to +85 °C ambient). |
Use Scenario: Front-end protection for solar-charged 48 V battery inputs in cellular-connected environmental monitoring gateways deployed in coastal zones. IC Role / Device Role / Timing Role: High-Tj (175 °C) TVS mounted adjacent to input fuse, surviving sustained ambient temperatures up to +70 °C. Use Value: Eliminates field returns due to salt-humidity-induced leakage degradation, verified by JESD22-B102 E3 solderability testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A (Bourns) | Same 48 V VRWM, but lower PPP = 600 W (10/1000 µs); SMB package (smaller footprint, higher thermal resistance). | Limited to lower-energy surges; unsuitable for IEC 61000-4-4 Level 4 or telecom lightning standards. | Select only if space-constrained and surge energy is confirmed ≤600 W. |
| 1.5KE48A (Littelfuse) | Same 48 V rating, PPP = 1500 W, axial DO-201 package; higher leakage (5 µA) and lower Tj(max) = 150 °C. | Requires through-hole assembly; not suitable for high-density SMT boards or extended-temperature industrial use. | Choose only for legacy through-hole designs where re-layout is prohibited. |
Compared with SMBJ48A and 1.5KE48A, SMC50J48A delivers 8.3× higher surge power handling, 25× lower leakage, and 25 °C higher junction temperature capability - making it the sole option for compact, high-reliability 48 V rail protection in modern industrial and telecom platforms.
Availability
SMC50J48A is available at Aetrix Electronics and suitable for industrial DC power supplies, telecom 48 V backup systems, and motor drive control boards requiring stable component supply, long-lifecycle support, and traceable sourcing for safety-critical deployments.
Supply support for SMC50J48A 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 analog ICs for automotive, industrial, and consumer markets.
The SMC50J TVS series targets high-reliability surge protection in industrial automation and telecom infrastructure, emphasizing planar technology for low leakage, high Tj, and JEDEC-standardized SMC packaging for seamless integration into automated manufacturing.
FAQ
What is the maximum clamping voltage of SMC50J48A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 77.4 V at 100 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature per the αT coefficient (10.3 × 10−4/°C), reaching ~82.5 V at Tj = 125 °C.
Is SMC50J48A suitable for bidirectional signal line protection?
No - SMC50J48A is unidirectional (A suffix), intended for single-polarity DC rail protection. For bidirectional applications such as RS-485 or USB data lines, the SMC50J48CA variant must be used, which provides symmetrical clamping in both directions.
Does SMC50J48A meet RoHS and REACH requirements?
Yes - SMC50J48A is manufactured in ST's ECOPACK2-compliant facilities and meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with no SVHC substances above threshold levels. Full compliance documentation is available via ST's quality portal.
What is the recommended PCB footprint for SMC50J48A?
The recommended footprint follows IPC-7531 and JEDEC MO-136AA, with pad dimensions of 5.11 mm × 1.54 mm (length × width), 8.19 mm center-to-center spacing, and 3.14 mm overall pad-to-pad clearance. Thermal relief vias under pads improve heat dissipation during surge events.
SMC50J48A 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):
- 48V (Max)
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 65A
- 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
SMC50J48A FAQ
1.How can I place an order for SMC50J48A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J48A 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 SMC50J48A reliable?
The price and inventory of SMC50J48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J48A is usually 5 days.
3.What payment methods are accepted for SMC50J48A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J48A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J48A?
SMC50J48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J48A 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 SMC50J48A?
For technical support, including SMC50J48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J48A requirements.
6.How does Aetrix verify that SMC50J48A is sourced from the original manufacturer or authorized distributors?
All SMC50J48A 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 SMC50J48A meets industry standards.
7.What is the process for return or replacement of SMC50J48A?
All SMC50J48A units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J48A, 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 SMC50J48A part is unused and in its original packaging.
Return procedure for SMC50J48A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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