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STMicroelectronics SMCJ24CA-TR
- Part No.:
- SMCJ24CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CA-TR.pdf
- Description:
- TVS DIODE 24VWM 50VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,939
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Product details
Overview
SMCJ24CA-TR from STMicroelectronics is a bidirectional 1500 W transient voltage suppression (TVS) diode in SMC package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 24 V standoff voltage (VRM), 38.9 V clamping voltage at 40 A (10/1000 µs), ≤0.2 µA leakage at 25 °C, and operates up to 150 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMCJ24CA-TR datasheet, SMCJ24CA-TR pinout, SMCJ24CA-TR application, or SMCJ24CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low dynamic resistance (0.235 Ω), IEC 61000-4-2 ±30 kV contact/air discharge compliance, and thermal derating above 25 °C ambient.
Technical Context
This TVS diode uses planar junction technology to achieve stable breakdown characteristics and low leakage across temperature. Its bidirectional configuration enables symmetric clamping on AC-coupled or floating lines without polarity constraints.
The device supports dual pulse standards: 1500 W peak power under 10/1000 µs waveform and up to 10 kW under 8/20 µs lightning surge conditions. Thermal performance is validated per JEDEC JESD22-A104 with Tj max = 150 °C and MSL level 1 rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 24 V - maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR min) | 26.7 V at 1 mA - guaranteed minimum voltage at which avalanche conduction initiates |
| Clamping Voltage (VCL) | 38.9 V at 40 A (10/1000 µs) - peak voltage seen by protected circuit during surge |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - energy-handling capability for standard surge waveforms |
| Leakage Current (IRM) | ≤0.2 µA at VRM and 25 °C - minimal parasitic loading on sensitive analog or low-power circuits |
| Junction Temperature Range | –55 °C to +150 °C - enables deployment in under-hood automotive and industrial environments |
| ESD Rating | ±30 kV air/contact discharge (IEC 61000-4-2 Level 4) - exceeds industrial immunity requirements |
Pinout & Package
SMCJ24CA-TR is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A). The bidirectional structure means both terminals are symmetrical - no polarity marking required for functional operation, though physical orientation follows JEDEC-standard SMC outline (L = 5.55–6.25 mm, E = 7.75–8.15 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current entry point (positive surge) | Conducts when voltage at A exceeds K by ≥VBR; forms one half of bidirectional clamp path |
| Cathode (K) | Transient current entry point (negative surge) | Conducts when voltage at K exceeds A by ≥VBR; completes symmetrical clamping function |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating buses without external polarity management |
| Low dynamic resistance (RD) | 0.235 Ω - minimizes clamping voltage rise under high-current surges (e.g., 8/20 µs lightning events) |
| High-temperature reliability | Rated for 150 °C junction operation with <0.2 µA leakage at 25 °C and <1000 nA at 125 °C (Fig. 9) |
| UL94 V0 epoxy housing | Ensures flame-retardant PCB mounting in safety-critical industrial and transportation systems |
| JEDEC-compliant SMC footprint | Supports automated placement and reflow per IPC/JEDEC J-STD-020 MSL level 1 (no floor life limitation) |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input rail in programmable logic controller (PLC) power stage exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter input to limit transient voltage to ≤40 V. Use Value: Prevents damage to downstream regulators and microcontrollers during 100 V/10 ms load dump events per ISO 7637-2 Pulse 5a. |
Use Scenario: LIN bus line in door module subjected to ESD events during assembly and field service. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN transceiver pins and chassis ground to shunt fast ESD pulses. Use Value: Maintains LIN signal integrity by clamping ±30 kV ESD spikes within 1 ns while adding <10 pF capacitance at 0 V bias. |
| Telecom DC Feeder Protection | Renewable Energy Inverter DC Link |
|
Use Scenario: –48 V telecom power feed line vulnerable to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional TVS connected between –48 V rail and return, absorbing 8/20 µs surges up to 10 kW. Use Value: Limits voltage excursion to <60 V during 5 kA surge, preserving isolation barriers and monitoring ICs. |
Use Scenario: DC link capacitor bank in solar inverter exposed to grid-switching transients and capacitor bank ringing. IC Role / Device Role / Timing Role: Parallel-mounted TVS across DC+ and DC– to suppress repetitive 10/1000 µs switching spikes. Use Value: Extends electrolytic capacitor lifetime by reducing RMS voltage stress during 1500 W surge events at 10 kHz repetition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA-TR | Lower PPP (600 W vs. 1500 W); same VRM/VBR but higher VCL (43.5 V @ 27.3 A) | Restricted to lower-energy surges; unsuitable for load dump or lightning-level threats | Select only if space-constrained SMB footprint is mandatory and surge energy remains <600 W. |
| 1.5KE24CA | Through-hole DO-201 package; identical electrical specs but 1.5 kW rating and higher thermal mass | Requires manual or wave soldering; better long-term thermal stability in high-ambient environments | Choose for legacy designs or where board-level mechanical robustness outweighs SMT automation benefits. |
Compared with SMBJ24CA-TR and 1.5KE24CA, SMCJ24CA-TR delivers optimal balance of high surge capacity (1500 W), SMT manufacturability, and compact SMC footprint - making it preferred for modern industrial and automotive power electronics where PCB real estate and automated assembly are critical.
Availability
SMCJ24CA-TR is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, telecom DC feeder protection, and renewable energy inverter DC link applications requiring stable component supply and full IEC 61000-4-2/4-4 compliance.
Supply support for SMCJ24CA-TR 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 automotive-grade ICs with strong focus on industrial and automotive reliability.
SMCJxxCA series belongs to ST's high-power TVS portfolio, engineered specifically for robust transient suppression in harsh-environment DC power systems where bidirectional clamping, low leakage, and high-temperature operation are mandatory.
FAQ
What is the difference between SMCJ24A-TR and SMCJ24CA-TR?
SMCJ24A-TR is unidirectional - it clamps only positive surges relative to ground and requires correct polarity installation. SMCJ24CA-TR is bidirectional, providing symmetrical clamping for both positive and negative transients without polarity dependency, making it ideal for AC-coupled or floating signal lines like LIN or RS-485.
Does SMCJ24CA-TR require heatsinking for 1500 W surge handling?
No external heatsink is required for single-event surge handling, as energy dissipation occurs in microseconds. However, thermal design must follow ST's recommended SMC footprint (Figure 14) with ≥3.14 cm² copper area per lead to maintain Rth(j-a) ≤100 °C/W and prevent cumulative junction temperature exceedance during repetitive surges.
Can SMCJ24CA-TR be used in place of a 24 V Zener diode for overvoltage protection?
No - while both regulate voltage, Zener diodes are intended for continuous regulation and lack surge-rated construction. SMCJ24CA-TR is optimized for nanosecond-to-microsecond transient clamping, not steady-state voltage reference; using it as a Zener risks premature failure under DC bias near VRM due to thermal runaway.
What is the typical junction capacitance of SMCJ24CA-TR at 0 V bias?
Per Figure 8 in DS1284 Rev 11, junction capacitance is approximately 200 pF at 0 V bias and 1 MHz test frequency. This value decreases rapidly with increasing reverse bias - e.g., ~40 pF at 12 V - enabling use in moderate-speed data lines without signal distortion.
SMCJ24CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 200A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC (DO-214AB)
SMCJ24CA-TR FAQ
1.How can I place an order for SMCJ24CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CA-TR 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 SMCJ24CA-TR reliable?
The price and inventory of SMCJ24CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24CA-TR is usually 5 days.
3.What payment methods are accepted for SMCJ24CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CA-TR?
SMCJ24CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CA-TR 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 SMCJ24CA-TR?
For technical support, including SMCJ24CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CA-TR requirements.
6.How does Aetrix verify that SMCJ24CA-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ24CA-TR 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 SMCJ24CA-TR meets industry standards.
7.What is the process for return or replacement of SMCJ24CA-TR?
All SMCJ24CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CA-TR, 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 SMCJ24CA-TR part is unused and in its original packaging.
Return procedure for SMCJ24CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ24CA-TR Tags
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