My Inquiry
My Account
STMicroelectronics SMC50J33CA
- Part No.:
- SMC50J33CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J33CA.pdf
- Description:
- 5000 W, 33 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:700
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMC50J33CA 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 53.3 V (max) under 94 A IPP, and operates up to 175 °C junction temperature - ideal for industrial motor drives and telecom power interfaces requiring robust IEC 61000-4-2/4-4 compliance.
For engineers reviewing the SMC50J33CA datasheet, SMC50J33CA pinout, SMC50J33CA application, or SMC50J33CA equivalent, this device is selected for high-reliability DC bus protection where low leakage (0.2 µA @ 25 °C), tight VBR tolerance (36.7–40.5 V), and JEDEC-registered SMC package compatibility with automated assembly are critical design requirements.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide symmetric clamping in both directions, enabling protection of balanced differential lines (e.g., RS-485, CAN FD) without polarity constraints. Its dynamic resistance of 10.0 mΩ ensures minimal voltage overshoot during fast 8/20 μs surges up to 136 A.
The device meets IEC 61000-4-2 level 4 (±30 kV air/contact discharge) and IEC 61000-4-4 level 4 (4 kV), with thermal stability maintained across –55 °C to +175 °C operating range and MSL level 1 moisture sensitivity rating for unlimited floor life.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 5000 W - sustains repeated lightning-surge transients on 24–48 V DC power buses without degradation |
| Stand-off Voltage (VRM) | 33 V - blocks normal system voltage while triggering above 36.7 V breakdown threshold |
| Clamping Voltage (VCL) | 53.3 V max @ 94 A - limits downstream IC stress to safe levels during 10/1000 μs surge events |
| Leakage Current | 0.2 µA @ 25 °C - negligible standby power loss in battery-backed or energy-sensitive circuits |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in under-hood automotive, industrial PLC, and outdoor telecom enclosures |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact/air discharge - exceeds level 4 for direct human-body ESD immunity on exposed ports |
| Package | SMC (DO-214AB) - JEDEC-registered surface-mount outline compatible with IPC-7531 footprint and reflow profiles |
Pinout & Package
SMC50J33CA uses the standard SMC (DO-214AB) package: 2-terminal, bidirectional, non-polarized device with cathode bar marking on one end. The package measures 7.75–8.15 mm × 5.55–6.25 mm × 2.45 mm max height and features matte tin-plated leads for RoHS-compliant soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (marked with bar) | Surge current path terminal | Bidirectional conduction - either terminal serves as input/output; cathode bar indicates polarity reference only for unidirectional variants (not functional in CA type) |
| Case / Body | Thermal and mechanical interface | Exposed copper pad area provides primary heat dissipation path to PCB copper; requires minimum 3.14 cm² copper per lead per Figure 12 |
Key Features
| Feature | Design Value |
|---|---|
| High surge capability | 5000 W (10/1000 μs) and up to 48 kW (8/20 μs) enables single-device protection against lightning-induced surges in AC/DC adapters and PoE injectors |
| Low dynamic resistance | 10.0 mΩ - minimizes clamping voltage rise under high di/dt, critical for protecting fast-switching MOSFET gates and gate drivers |
| Wide operating temperature | –55 °C to +175 °C - eliminates derating in high-ambient environments such as industrial inverters and railway control units |
| Low leakage current | 0.2 µA @ 25 °C - preserves battery life in always-on IoT sensors and avoids false triggering in high-impedance analog front-ends |
| JEDEC-registered SMC package | Standardized mechanical dimensions and thermal profile - ensures drop-in replacement and consistent reflow yield across manufacturing sites |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of 48 V DC bus against load-dump transients and inductive kickback from H-bridge switching. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across input capacitor to limit voltage excursion during 100 ns–1 ms overvoltage events. Use Value: Prevents damage to upstream DC-DC controllers and downstream gate drivers by clamping to ≤53.3 V at 94 A, maintaining system uptime in factory automation systems. |
Use Scenario: Input-stage surge protection for 48 V telecom rectifiers subjected to lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Primary TVS device in parallel with bulk input capacitor, absorbing 4 kV IEC 61000-4-4 ring-wave transients. Use Value: Enables compliance with GR-1089-CORE Level 4 requirements while sustaining 5000 W peak power without thermal runaway at 175 °C ambient. |
| Automotive Body Control Modules | RS-485 Data Lines |
|
Use Scenario: Protection of LIN/CAN power domains in BCMs exposed to ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Secondary-level clamp after LC filter, handling residual energy not suppressed by front-end ferrites and capacitors. Use Value: Survives 175 °C junction temperature during engine-bay operation and maintains <0.2 µA leakage to avoid battery drain over 10-year vehicle lifetime. |
Use Scenario: Common-mode surge suppression on full-duplex RS-485 transceivers in building automation networks. IC Role / Device Role / Timing Role: Bidirectional TVS connected between A/B lines and ground, providing symmetrical clamping without signal inversion. Use Value: Ensures ±30 kV ESD immunity per IEC 61000-4-2 while adding <10 pF capacitance - no data rate degradation up to 25 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA (STMicroelectronics) | Lower peak power: 600 W (10/1000 μs); same VRM/VBR but higher VCL (64.3 V @ 9.3 A) | Suitable for lower-energy signal-line protection only; insufficient for 48 V DC bus surge handling | Select when space-constrained SMB package is required and surge energy remains below 600 W |
| 1.5KE33CA (ON Semiconductor) | Higher leakage: 5 µA @ 25 °C; larger DO-201 package; lower Tj max: 150 °C | Limited to commercial-temperature applications; incompatible with high-ambient industrial designs | Choose only for cost-sensitive legacy designs where 150 °C max junction temperature is acceptable |
Compared with SMBJ33CA and 1.5KE33CA, SMC50J33CA uniquely combines 5000 W surge rating, 175 °C operation, and 0.2 µA leakage in a compact SMC package - making it the sole option for high-reliability 48 V industrial power rail protection where thermal margin and long-term stability are non-negotiable.
Availability
SMC50J33CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and RS-485 data line protection requiring stable component supply across extended product lifecycles.
Supply support for SMC50J33CA 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 microcontrollers for industrial, automotive, and consumer markets.
The SMC50J series belongs to ST's high-power TVS portfolio, engineered specifically for robust overvoltage protection in harsh-environment power conversion and communication infrastructure applications.
FAQ
What is the maximum clamping voltage for SMC50J33CA under a 10/1000 μs surge?
The maximum clamping voltage (VCL) is 53.3 V at 94 A peak pulse current for a 10/1000 μs waveform, measured at 25 °C ambient. This value increases with junction temperature at a coefficient of 10⁻⁴/°C, reaching approximately 55.1 V at 125 °C junction temperature per the αT derating formula in DS13845.
Is SMC50J33CA compatible with lead-free reflow soldering processes?
Yes - SMC50J33CA is rated for lead-free reflow with a peak temperature of 240–245 °C for 60 seconds (max 90 s), matching IPC/JEDEC J-STD-020 MSL level 1 requirements. Its matte tin-plated leads ensure reliable wetting and void-free joints on FR4 PCBs with 70 µm copper thickness.
How does the bidirectional configuration affect circuit layout versus unidirectional TVS diodes?
SMC50J33CA has no polarity requirement: either terminal may connect to line or ground, simplifying layout for differential or floating systems like RS-485. Unlike unidirectional types (e.g., SMC50J33A), it does not require cathode orientation toward the protected rail, eliminating routing constraints and reducing BOM complexity in dual-rail designs.
Can SMC50J33CA be used in parallel to increase surge current handling?
No - ST does not recommend paralleling SMC50J33CA devices due to mismatch in dynamic resistance (RD = 10.0 mΩ) and VBR tolerance (±5%), which causes uneven current sharing and potential thermal runaway. For higher current needs, select a higher-rated part such as SMC50J40CA (VCL = 64.5 V @ 78 A) instead.
SMC50J33CA 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):
- 33V (Max)
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 94A
- 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
SMC50J33CA FAQ
1.How can I place an order for SMC50J33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J33CA 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 SMC50J33CA reliable?
The price and inventory of SMC50J33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J33CA is usually 5 days.
3.What payment methods are accepted for SMC50J33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J33CA?
SMC50J33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J33CA 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 SMC50J33CA?
For technical support, including SMC50J33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J33CA requirements.
6.How does Aetrix verify that SMC50J33CA is sourced from the original manufacturer or authorized distributors?
All SMC50J33CA 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 SMC50J33CA meets industry standards.
7.What is the process for return or replacement of SMC50J33CA?
All SMC50J33CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J33CA, 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 SMC50J33CA part is unused and in its original packaging.
Return procedure for SMC50J33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J33CA Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
