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STMicroelectronics SMC50J28CA
- Part No.:
- SMC50J28CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J28CA.pdf
- Description:
- 5000 W, 28 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:903
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Product details
Overview
SMC50J28CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in power and signal lines. It features a 28 V standoff voltage (VRM), 45.4 V clamping voltage at 110 A (10/1000 µs), 5000 W peak pulse power, 0.2 µA max leakage at 25 °C, and operates up to 175 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMC50J28CA datasheet, SMC50J28CA pinout, SMC50J28CA application, or SMC50J28CA equivalent, key selection criteria include bidirectional clamping behavior, low dynamic resistance (36.6 mΩ), IEC 61000-4-2 ±30 kV contact/air discharge compliance, and SMC package thermal robustness for high-reliability PCB layouts.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide symmetric clamping for AC-coupled or floating signal/power rails. Its bidirectional structure enables protection without polarity sensitivity, and its low leakage (≤0.2 µA at VRM = 28 V) ensures minimal impact on high-impedance sensor interfaces.
The device achieves 5000 W (10/1000 µs) and up to 48 kW (8/20 µs) surge handling with a dynamic resistance of 36.6 mΩ - enabling fast voltage limiting during sub-microsecond transients while maintaining stable thermal performance up to Tj = 175 °C per JEDEC JESD22-A104.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 28 V - maximum continuous reverse operating voltage before clamping initiates |
| Clamping Voltage (VCL) | 45.4 V at 110 A (10/1000 µs) - limits transient voltage seen by downstream circuitry |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - sustains high-energy surges without failure under standard test waveform |
| Leakage Current (IRM) | 0.2 µA at 25 °C - negligible DC loading on sensitive analog or battery-backed circuits |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in under-hood automotive and industrial ambient environments |
| Dynamic Resistance (RD) | 36.6 mΩ - determines voltage overshoot during fast current rise (dI/dt); lower RD improves clamping fidelity |
| ESD Withstand (IEC 61000-4-2) | ±30 kV air/contact discharge - exceeds Level 4 immunity for front-panel and connector interfaces |
Pinout & Package
SMC50J28CA is housed in an industry-standard SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A). The package complies with JEDEC MO-136AC and IPC7531 footprint standards, featuring matte tin-plated leads and MSL Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Terminal 1 (cathode-bar side marked) | Connected to protected line in bidirectional configuration; no polarity bias required |
| Cathode (K) | Terminal 2 (marked with cathode bar) | Reference terminal; forms symmetrical avalanche path with Anode for ± transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating buses without polarity constraints |
| Low dynamic resistance (36.6 mΩ) | Reduces clamping voltage overshoot during fast-rising transients (e.g., lightning-induced surges) |
| 175 °C max junction temperature | Supports placement near heat-generating components (e.g., MOSFETs, inductors) in compact power designs |
| 0.2 µA leakage at 25 °C | Maintains accuracy in high-impedance sensor front-ends and low-power standby circuits |
| JEDEC-compliant SMC package | Ensures mechanical compatibility with automated assembly and thermal reliability on FR4 PCBs |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Protection |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across input rails to clamp surges before they reach upstream rectifier and bulk capacitor. Use Value: 45.4 V clamping prevents overvoltage damage to 36 V-rated input capacitors and reduces need for oversized derating. |
Use Scenario: CAN_H/CAN_L differential pair in BCM exposed to ESD events during connector mating/unmating. IC Role / Device Role / Timing Role: Dual-channel bidirectional TVS (one per line) referenced to chassis ground, suppressing ±30 kV ESD pulses per IEC 61000-4-2. Use Value: Low 36.6 mΩ RD ensures <100 ns response time and preserves CAN signal integrity up to 1 Mbps. |
| Telecom AC-DC Adapter Surge Protection | Smart Meter Communication Interface Protection |
|
Use Scenario: Secondary-side 12 V output rail of isolated AC-DC adapter subjected to fast transient bursts per IEC 61000-4-4 Level 4 (4 kV). IC Role / Device Role / Timing Role: SMC50J28CA placed between output and ground to shunt energy from coupled surges on transformer secondary winding. Use Value: 5000 W (10/1000 µs) rating handles repetitive surges without parametric shift or thermal runaway. |
Use Scenario: RS-485 interface of utility smart meter connected to external data concentrator via long outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS on both A and B lines to suppress induced lightning surges and ESD on field wiring. Use Value: 175 °C Tj rating allows reliable operation inside sealed, thermally constrained meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA (ON Semiconductor) | Same 28 V VRM and bidirectional topology, but rated for 600 W (not 5000 W); SMB package (smaller thermal mass) | Limited to low-energy ESD-only use; unsuitable for IEC 61000-4-4 or load-dump scenarios | Select only when space-constrained and surge energy ≤600 W is confirmed |
| 1.5KE28CA (Littelfuse) | Same 28 V VRM and 5000 W rating, but axial DO-201 package; higher thermal resistance (RθJA ≈ 30 °C/W vs. SMC's ~25 °C/W) | Requires through-hole mounting and larger board area; less compatible with high-density SMT layouts | Prefer for legacy through-hole designs or where manual rework access is prioritized over density |
Compared with SMBJ28CA and 1.5KE28CA, SMC50J28CA uniquely combines 5000 W surge capability, SMT-compatible SMC packaging, and 175 °C operation - making it optimal for modern high-density, high-reliability industrial and automotive power interfaces.
Availability
SMC50J28CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom adapters, and smart meter communication interfaces requiring stable component supply and full IEC 61000-4-2/4-4 compliance.
Supply support for SMC50J28CA 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 ICs for industrial, automotive, and consumer markets.
SMC50J TVS series belongs to ST's high-power transient protection product line, engineered specifically for robust ESD/surge resilience in harsh-environment power conversion and connectivity systems.
FAQ
What is the difference between SMC50J28A and SMC50J28CA?
SMC50J28A is unidirectional - it clamps only in reverse bias and requires correct polarity installation. SMC50J28CA is bidirectional, providing symmetrical clamping for both positive and negative transients without polarity dependency. This makes the 'CA' version ideal for AC-coupled or floating signal lines like CAN or RS-485.
Can SMC50J28CA be used in place of a 24 V-rated TVS?
No - SMC50J28CA has a 28 V standoff voltage (VRM), meaning it begins clamping above ~28 V. Using it to protect a 24 V system risks premature conduction during normal operation (e.g., 24 V ±10% tolerance reaches 26.4 V). A 22 V or 24 V VRM part like SMC50J22CA or SMC50J24CA is appropriate for strict 24 V rail protection.
Does SMC50J28CA meet automotive AEC-Q200 requirements?
SMC50J28CA is not AEC-Q200 qualified. While it operates up to 175 °C and meets IEC 61000-4-2/4-4, ST does not list this specific variant in its AEC-Q200 stress-tested portfolio. For automotive-grade qualification, refer to ST's Automotive TVS family (e.g., SMAJ28A-Q or SMCJ28A-Q variants).
How does junction temperature affect clamping voltage?
Clamping voltage increases with junction temperature at a coefficient αT = 10⁻⁴ /°C. At 125 °C, VCL rises ~1% above its 25 °C value (45.4 V → ~45.9 V). This positive TC ensures predictable, non-catastrophic behavior under thermal stress - critical for sustained surge duty cycles in enclosed power systems.
SMC50J28CA 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V (Max)
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 110A
- 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
SMC50J28CA FAQ
1.How can I place an order for SMC50J28CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J28CA 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 SMC50J28CA reliable?
The price and inventory of SMC50J28CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J28CA is usually 5 days.
3.What payment methods are accepted for SMC50J28CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J28CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J28CA?
SMC50J28CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J28CA 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 SMC50J28CA?
For technical support, including SMC50J28CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J28CA requirements.
6.How does Aetrix verify that SMC50J28CA is sourced from the original manufacturer or authorized distributors?
All SMC50J28CA 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 SMC50J28CA meets industry standards.
7.What is the process for return or replacement of SMC50J28CA?
All SMC50J28CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J28CA, 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 SMC50J28CA part is unused and in its original packaging.
Return procedure for SMC50J28CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J28CA Tags
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