My Inquiry
My Account
STMicroelectronics SMC50J70CA
- Part No.:
- SMC50J70CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J70CA.pdf
- Description:
- Linear IC's
- Quantity:
- Payment:
- Shipping:
Inventory:4,380
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMC50J70CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 113 V (max) under 42 A IPP, and maintains low leakage (0.2 µA at 25 °C) up to 175 °C junction temperature - deployed in industrial PLC I/O modules, telecom power supplies, and automotive body control units.
For engineers reviewing the SMC50J70CA datasheet, SMC50J70CA pinout, SMC50J70CA application, or SMC50J70CA equivalent, key selection criteria include its 70 V standoff voltage, bidirectional polarity, SMC package thermal robustness, and compliance with IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 level 4 (4 kV).
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide fast response (<1 ns) to electrostatic discharge and repetitive surges. Its bidirectional configuration enables symmetrical clamping on AC-coupled or floating lines without polarity dependency.
Thermal design is enabled by a JEDEC-registered SMC package with 175 °C max operating junction temperature and low thermal resistance (Rth(j-a) ≈ 100 °C/W on standard FR4 footprint). Dynamic resistance (RD) is 174 mΩ at 8/20 µs, ensuring stable clamping across pulse durations from 10 µs to 10 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 70 V - maximum continuous reverse working voltage before leakage exceeds 1 µA; defines safe operating margin for 48–60 V DC systems. |
| Breakdown Voltage (VBR) | 77.9–86.1 V at 1 mA - tight tolerance ensures predictable turn-on during overvoltage events without premature conduction. |
| Clamping Voltage (VCL) | 113 V max at 42 A (10/1000 µs) - limits downstream voltage stress to protect 100 V-rated MOSFETs and controllers. |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs); up to 640 kW (8/20 µs) - sustains high-energy lightning-induced surges per IEC 61000-4-5. |
| Leakage Current (IR) | 0.2 µA at 25 °C and VRWM - negligible loading on high-impedance sensor bias networks or battery-backed circuits. |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive, industrial motor drives, and outdoor telecom enclosures. |
| ESD Robustness | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4, eliminating need for external ESD staging in USB, RS-485, and CAN FD interfaces. |
Pinout & Package
The SMC50J70CA is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with matte tin-plated leads, compatible with IPC-7531 footprints and reflow profiles per J-STD-020 MSL Level 1. Thermal performance is optimized using 3.14 mm × 5.11 mm copper pads per lead on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode-bar side) | Transient current sink (negative half-cycle) | Provides low-impedance path to ground during negative transients; marked with cathode bar for polarity identification. |
| Cathode (non-bar side) | Transient current sink (positive half-cycle) | Serves as return path for positive surges; symmetric structure enables identical clamping in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating differential buses (e.g., RS-485, CAN, Ethernet PHY) without polarity constraints. |
| 175 °C junction rating | Supports sustained operation in high-ambient environments (e.g., engine control units, solar inverters) without derating or forced cooling. |
| Low dynamic resistance (174 mΩ) | Minimizes VCL rise under high-current surges, preserving voltage margin for downstream 100 V logic and gate drivers. |
| JEDEC-registered SMC outline | Ensures mechanical compatibility with automated pick-and-place equipment and standard reflow profiles (peak 240–245 °C). |
| UL94 V0 flammability rating | Meets safety requirements for enclosed industrial and medical power supplies where flame propagation must be suppressed. |
Applications
| Industrial PLC I/O Protection | Telecom DC Power Input |
|---|---|
|
Use Scenario: Protecting 24 V/48 V digital input channels against induced surges from relay switching and nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between field-side terminal and isolation barrier, absorbing >5 kV ring-wave transients. Use Value: Prevents latch-up or destruction of optocouplers and microcontroller GPIOs while maintaining <0.2 µA standby leakage. |
Use Scenario: Safeguarding primary-side DC-DC converter inputs in 48 V telecom rectifiers exposed to long cable runs and AC line coupling. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of bulk capacitors and active front-end controllers. Use Value: Clamps 4 kV IEC 61000-4-4 bursts to ≤113 V, enabling use of cost-optimized 150 V MOSFETs instead of 200 V devices. |
| Automotive Body Control Module | Smart Meter Power Supply |
|
Use Scenario: Shielding LIN bus transceivers and power window motor drivers from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on 12 V supply rail, responding within <1 ns to 100 V/100 A pulses. Use Value: Survives repeated 175 °C junction temperature excursions during under-hood operation without parametric drift. |
Use Scenario: Protecting metering IC power rails from surges entering via AC mains or RF communication antennas. IC Role / Device Role / Timing Role: Secondary-level protector after MOV-based primary suppression, handling residual fast-rising ESD events. Use Value: Delivers ±30 kV ESD immunity per IEC 61000-4-2 without degrading metrology accuracy due to sub-nA leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA (STMicroelectronics) | Lower PPP = 600 W (10/1000 µs); same VRWM, VCL, and SMC-equivalent SMB package. | Suitable for lower-energy signal-line protection (e.g., USB, HDMI), not main DC rail surge suppression. | Select when space-constrained layouts require smaller SMB footprint and surge energy stays below 600 W. |
| 1.5KE70CA (ON Semiconductor) | Higher VCL = 121 V at 41.3 A; axial DO-201 package; 1.5 kW PPP; no 175 °C rating. | Limited to through-hole mounting and ambient temperatures ≤150 °C; less suitable for high-density automotive PCBs. | Choose only for legacy through-hole designs where rework tolerance and axial form factor outweigh thermal and power advantages. |
Compared with SMBJ70CA and 1.5KE70CA, SMC50J70CA uniquely combines 5 kW surge capability, 175 °C operation, and surface-mount SMC packaging - making it optimal for next-generation industrial and automotive power rail protection where thermal density and reliability are critical.
Availability
SMC50J70CA is available at Aetrix Electronics and suitable for industrial PLC I/O modules, telecom DC power inputs, and automotive body control units requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMC50J70CA 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 TVS series targets high-reliability DC power and interface protection, engineered specifically for applications demanding ultra-low leakage, high-temperature resilience, and certified ESD/surge immunity without compromising board space.
FAQ
What is the maximum clamping voltage of SMC50J70CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 113 V at 42 A peak pulse current for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases linearly with junction temperature at 10.5 × 10−4/°C, reaching ~122 V at 175 °C - a critical design parameter for selecting downstream voltage ratings.
Is SMC50J70CA unidirectional or bidirectional, and how is polarity identified?
SMC50J70CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. Polarity is indicated by a cathode bar marking on the package - the bar side is the anode for negative surges and the non-bar side is the cathode for positive surges, but both terminals conduct equally during overvoltage events.
Does SMC50J70CA meet automotive AEC-Q200 requirements?
No - SMC50J70CA is not AEC-Q200 qualified. While it operates up to 175 °C and meets IEC 61000-4-2/4-4, it lacks the stress testing (e.g., temperature cycling, humidity bias, mechanical shock) required for automotive qualification. For AEC-Q200-compliant alternatives, consider ST's Automotive-grade SMAJ70CA or similar qualified variants.
Can SMC50J70CA replace SMCJ70CA in existing designs?
Yes - SMC50J70CA is a direct functional and pin-compatible upgrade to SMCJ70CA, offering higher peak pulse power (5000 W vs. 1500 W), lower dynamic resistance (174 mΩ vs. ~300 mΩ), and extended temperature range (175 °C vs. 150 °C). No layout changes are needed, but verify thermal relief pad sizing supports the higher energy dissipation.
SMC50J70CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC50J
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V (Max)
- Voltage - Breakdown (Min):
- 77.9V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 42A
- 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
SMC50J70CA FAQ
1.How can I place an order for SMC50J70CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J70CA 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 SMC50J70CA reliable?
The price and inventory of SMC50J70CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J70CA is usually 5 days.
3.What payment methods are accepted for SMC50J70CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J70CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J70CA?
SMC50J70CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J70CA 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 SMC50J70CA?
For technical support, including SMC50J70CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J70CA requirements.
6.How does Aetrix verify that SMC50J70CA is sourced from the original manufacturer or authorized distributors?
All SMC50J70CA 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 SMC50J70CA meets industry standards.
7.What is the process for return or replacement of SMC50J70CA?
All SMC50J70CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J70CA, 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 SMC50J70CA part is unused and in its original packaging.
Return procedure for SMC50J70CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J70CA 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…
