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STMicroelectronics SMC50J36A
- Part No.:
- SMC50J36A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J36A.pdf
- Description:
- 5000 W, 36 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,125
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Product details
Overview
SMC50J36A from STMicroelectronics is a unidirectional 36 V standoff voltage transient voltage suppressor (TVS) diode in SMC package, rated for 5000 W peak pulse power (10/1000 µs), 162 A peak pulse current, and clamping voltage of 58.1 V at 100 A - designed for IEC 61000-4-2 ESD and IEC 61000-4-4 surge protection in DC power rails and signal lines of industrial motor drives and telecom interfaces.
For engineers reviewing the SMC50J36A datasheet, SMC50J36A pinout, SMC50J36A application, or SMC50J36A equivalent, key selection criteria include its 0.2 µA max leakage at 25 °C, 175 °C max junction temperature, JEDEC-registered SMC package compatibility, and verified 30 kV contact discharge immunity per IEC 61000-4-2 Level 4.
Technical Context
The SMC50J36A employs planar silicon avalanche technology to deliver precise breakdown at 40–44.2 V (VBR min–max @ 1 mA), with dynamic resistance of 57.8 mΩ enabling low clamping voltage rise under fast transients. Its thermal design supports continuous operation up to Tj = 175 °C, validated by JESD22-B102 E3 solderability and MIL-STD-750 Method 2026 reliability testing.
It meets IEC 61000-4-4 Level 4 (4 kV) and exceeds IEC 61000-4-2 Level 4 (30 kV air/contact discharge), with junction capacitance <100 pF at 1 MHz and VR = 0 V - making it suitable for high-speed data line protection where capacitive loading must remain minimal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 36 V - maximum continuous reverse operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 40–44.2 V @ 1 mA - precise avalanche onset range ensuring predictable clamping behavior. |
| Clamping Voltage (VCL) | 58.1 V @ 100 A (10/1000 µs) - limits downstream voltage stress during surge events. |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - sustains high-energy transients without failure in industrial environments. |
| Leakage Current (IR) | 0.2 µA @ 25 °C - negligible standby power loss and signal integrity impact in battery-powered systems. |
| Junction Temperature Range | −55 to +175 °C - enables deployment in under-hood automotive ECUs and high-temperature industrial controllers. |
| ESD Withstand (IEC 61000-4-2) | 30 kV contact / 30 kV air discharge - exceeds Level 4, eliminating need for external ESD staging in front-end interfaces. |
Pinout & Package
SMC50J36A uses the JEDEC-registered SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length × 5.55–6.25 mm width × 2.45 mm height, with matte tin-plated leads and IPC-7531-compliant footprint. It features two terminals: cathode-marked anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point during forward conduction | Connected to protected line; conducts only during reverse surge when cathode is held at higher potential. |
| Cathode (bar-marked end) | Reference terminal / surge return path | Typically tied to ground or low-impedance return; defines polarity-sensitive clamping direction for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| High Surge Robustness | 5000 W (10/1000 µs) and up to 48 kW (8/20 µs) - withstands repetitive lightning-induced surges in outdoor telecom equipment. |
| Low Dynamic Resistance | 57.8 mΩ - minimizes VCL overshoot during fast-rising transients, improving system-level immunity margin. |
| High-Temperature Reliability | Rated to 175 °C junction temperature with JESD22-A108 qualification - ensures long-term stability in enclosed power converters. |
| Low Leakage Performance | 0.2 µA @ 25 °C - preserves battery life and avoids false triggering in high-impedance sensor inputs. |
| Standardized Footprint | JEDEC SMC outline with IPC-7531 compliance - enables drop-in replacement and automated assembly across production lines. |
Applications
| Industrial Motor Drives | Telecom Line Interfaces |
|---|---|
|
Use Scenario: Protection of 24–48 V DC control bus against inductive kickback and lightning-induced surges in servo amplifier PCBs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients below MOSFET gate oxide breakdown threshold. Use Value: Prevents catastrophic failure of isolated gate drivers and microcontrollers during motor stall or brake events. |
Use Scenario: Front-end surge suppression on RS-485/RS-422 differential pairs in base station remote radio units. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional device used in common-mode configuration across A/B lines to ground. Use Value: Maintains signal integrity up to 20 Mbps while surviving repeated 4 kV IEC 61000-4-4 bursts without parameter shift. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: CAN FD transceiver power rail protection in BCMs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping device on 5 V or 12 V supply input, coordinated with upstream fuse and inductor. Use Value: Limits voltage excursion to ≤60 V during 100 A surge, preserving transceiver functionality and avoiding system reset. |
Use Scenario: AC/DC auxiliary supply input protection in DIN-rail mounted meters subjected to utility grid switching transients. IC Role / Device Role / Timing Role: First-stage TVS on rectified DC bus, absorbing energy before secondary regulation and metering ICs. Use Value: Enables EN 50160 compliance by limiting 10/1000 µs surges to <65 V, preventing EEPROM corruption and RTC failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A (Bourns) | Same 36 V VRWM, but lower PPP = 600 W (SMB package); 62.5 V VCL @ 100 A. | Limited to lower-energy surges; unsuitable for 4 kV IEC 61000-4-4 Level 4 without derating. | Select only for space-constrained designs where surge threat is limited to ESD-only environments. |
| SAC305-36 (Littelfuse) | Higher PPP = 1500 W, but VCL = 69.4 V @ 100 A and Tj max = 150 °C. | Less effective clamping margin for 3.3 V/5 V logic rails; requires thermal derating above 125 °C ambient. | Prefer for cost-sensitive consumer-grade applications where 175 °C operation is not required. |
Compared with SMBJ36A and SAC305-36, SMC50J36A delivers superior surge handling (5000 W vs ≤1500 W), tighter clamping (58.1 V vs ≥62.5 V), and extended thermal capability (175 °C vs ≤150 °C), making it the optimal choice for mission-critical industrial and automotive power rail protection.
Availability
SMC50J36A is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, automotive body control modules, and smart energy meters requiring stable component supply across multi-year production cycles.
Supply support for SMC50J36A 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 industrial, automotive, and consumer markets.
The SMC50J series belongs to ST's high-power TVS portfolio, engineered specifically for robust transient suppression in harsh electromagnetic environments - emphasizing low leakage, high-temperature resilience, and standardized SMC packaging for industrial automation and infrastructure applications.
FAQ
What is the maximum clamping voltage of SMC50J36A under a 100 A 10/1000 µs surge?
The maximum clamping voltage (VCL) is 58.1 V when subjected to a 100 A, 10/1000 µs waveform at Tj = 25 °C, as specified in Table 2 of DS13845 Rev 1. This value increases linearly with junction temperature due to the αT coefficient of 10⁻⁴/°C, reaching ~61.5 V at 175 °C.
Can SMC50J36A be used in bidirectional signal line protection?
No - SMC50J36A is a unidirectional TVS diode, intended for DC power rail protection where polarity is fixed. For bidirectional signal lines like RS-485, the pin-compatible SMC50J36CA variant must be used, which features symmetrical breakdown in both directions and identical electrical ratings except for polarity marking.
Does SMC50J36A meet RoHS and REACH requirements?
Yes - SMC50J36A is manufactured in ST's ECOPACK2-compliant facilities and conforms to RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin, and halogen-free packaging is standard per ST's environmental policy documentation.
What is the recommended PCB footprint for SMC50J36A?
The recommended footprint matches JEDEC DO-214AB (SMC) standards: pad length 5.11 mm, pad width 3.14 mm, center-to-center pitch 8.19 mm, and copper area per lead ≥2.5 cm² to achieve Rth(j-a) ≤ 40 °C/W per Figure 12. Thermal vias under pads are advised for sustained high-current surge duty.
SMC50J36A 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):
- 36V (Max)
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 86A
- 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
SMC50J36A FAQ
1.How can I place an order for SMC50J36A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J36A 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 SMC50J36A reliable?
The price and inventory of SMC50J36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J36A is usually 5 days.
3.What payment methods are accepted for SMC50J36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J36A?
SMC50J36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J36A 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 SMC50J36A?
For technical support, including SMC50J36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J36A requirements.
6.How does Aetrix verify that SMC50J36A is sourced from the original manufacturer or authorized distributors?
All SMC50J36A 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 SMC50J36A meets industry standards.
7.What is the process for return or replacement of SMC50J36A?
All SMC50J36A units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J36A, 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 SMC50J36A part is unused and in its original packaging.
Return procedure for SMC50J36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J36A Tags
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