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STMicroelectronics SMBJ24CA-TR
- Part No.:
- SMBJ24CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24CA-TR.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:18,018
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Product details
Overview
SMBJ24CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for robust ESD and surge protection on signal/power lines in industrial, automotive, and telecom interfaces. It delivers 600 W peak pulse power (10/1000 µs), clamps transients to 38.9 V at 16 A, operates up to 150 °C junction temperature, and exhibits ≤0.2 µA leakage at 25 °C - enabling reliable protection in high-reliability SMPS and Ethernet PHY circuits.
For engineers reviewing the SMBJ24CA-TR datasheet, SMBJ24CA-TR pinout, SMBJ24CA-TR application, or SMBJ24CA-TR equivalent, key selection criteria include bidirectional clamping voltage (VCL = 38.9 V @ 16 A), low dynamic resistance (RD = 0.587 Ω), IEC 61000-4-2 level 4 compliance (30 kV air/contact discharge), and UL497B recognition for isolated loop circuit protection.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior and low leakage across temperature (≤1 µA at 85 °C). Its bidirectional architecture enables symmetric clamping on AC-coupled or differential lines without polarity constraints.
The device meets IEC 61000-4-4 level 4 (4 kV) and exceeds IEC 61000-4-2 level 4 (30 kV contact/air discharge), with a fast response time (<1 ns) and thermal stability up to Tj = 150 °C - critical for sustained surge handling in compact, thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 600 W - sustains repeated 16 A surges without degradation in standard PCB layout |
| Clamping Voltage VCL | 38.9 V @ 16 A - limits downstream IC stress below 40 V during 8/20 µs transients |
| Breakdown Voltage VBR | 26.7–28.1 V @ 1 mA - ensures reliable triggering before system-level damage thresholds |
| Leakage Current IR | ≤0.2 µA @ 24 V, 25 °C - minimizes standby power loss in battery-backed or low-power sensor nodes |
| Operating Junction Temp | −55 to +150 °C - supports deployment in under-hood automotive or industrial ambient environments |
| Dynamic Resistance RD | 0.587 Ω - reduces clamping overshoot and improves energy absorption linearity |
| ESD Withstand (IEC 61000-4-2) | 30 kV air / 30 kV contact - exceeds level 4 for direct human interaction points |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads per J-STD-002/E3, MSL Level 1, IPC7531-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Common terminal for bidirectional clamping | Internally connected to both P-N junctions; serves as reference node for symmetrical transient suppression |
| Anode | Common terminal for bidirectional clamping | Electrically identical to cathode in bidirectional configuration; no polarity dependency in circuit placement |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Enables use on AC-coupled lines (e.g., RS-485, CAN FD) without orientation constraints |
| UL497B recognition (E136224) | Validates suitability for isolated loop circuit protection in safety-critical industrial systems |
| Low dynamic resistance (0.587 Ω) | Reduces clamping voltage rise under high di/dt, improving protection margin for 3.3 V/5 V logic |
| High-temperature reliability (Tj = 150 °C) | Supports operation in thermally dense power supply modules and motor drive control boards |
| J-STD-020 MSL Level 1 | Allows unlimited floor life and reflow without baking, simplifying SMT production logistics |
Applications
| Industrial Ethernet PHY Protection | Automotive LIN Bus Interface |
|---|---|
|
Use Scenario: Protecting RJ45 magnetics and PHY ICs against ESD and lightning-induced surges in factory automation gateways. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pairs (TX+/TX−, RX+/RX−) to clamp common-mode transients before they reach the PHY. Use Value: Clamps 30 kV ESD events to <40 V while maintaining <0.2 µA leakage - preserving signal integrity and minimizing false triggers in 100BASE-TX links. |
Use Scenario: Safeguarding LIN transceivers in body control modules exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Placed between LIN bus line and ground to suppress ±40 V transients induced by inductive switching in 12 V vehicle networks. Use Value: Limits clamping voltage to 38.9 V at 16 A, ensuring transceiver survival during ISO 7637-2 Pulse 1/2a events without latch-up or parametric shift. |
| Telecom DSL Line Interface | SMPS Secondary-Side Output Protection |
|
Use Scenario: Shielding ADSL/VDSL line drivers and filters from induced surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Mounted across line-to-line and line-to-ground to absorb longitudinal and transverse mode surges per ITU-T K.21. Use Value: Delivers 600 W (10/1000 µs) pulse handling with <1 ns response - preventing damage to precision op-amps and hybrid transformers. |
Use Scenario: Protecting secondary-side synchronous rectifiers and feedback optocouplers in 65–100 W AC/DC adapters. IC Role / Device Role / Timing Role: Connected from output rail to ground to clamp flyback spikes and cross-regulation overshoot during load transients. Use Value: Maintains ≤0.2 µA leakage at 25 °C and ≤1 µA at 85 °C - avoiding efficiency loss and thermal drift in high-density, convection-cooled designs. |
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 from Vishay (SMBJ24CA-E3/5BT) | Vishay version has identical VBR (26.7–28.1 V), but higher max VCL (39.4 V @ 16 A) and RD = 0.62 Ω | Slightly higher clamping increases risk of overvoltage stress on 3.3 V logic; suitable where margin >0.5 V exists | Select when dual-sourcing required and layout allows minor clamping voltage increase |
| P6SMB24CA from ON Semiconductor | Same SMB package and VBR, but lower PPP (600 W), higher VCL (40.2 V @ 16 A), and RD = 0.75 Ω | Reduced clamping performance may compromise protection for 24 V systems operating near 36 V absolute max | Prefer only if ST stock is constrained and system VMAX ≥ 42 V |
Compared with Vishay SMBJ24CA-E3/5BT and ON Semi P6SMB24CA, the ST SMBJ24CA-TR offers the lowest clamping voltage (38.9 V) and dynamic resistance (0.587 Ω), delivering tighter protection margins for 24 V industrial controllers and faster transient recovery in high-frequency switching environments.
Availability
SMBJ24CA-TR is available at Aetrix Electronics and suitable for industrial Ethernet PHY protection, automotive LIN bus interface, and SMPS secondary-side output protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ24CA-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 microcontroller technologies for industrial, automotive, and consumer markets.
The SMBJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability, high-temperature ESD/surge suppression in space-constrained, thermally demanding applications such as industrial gateways and automotive ECUs.
FAQ
What is the maximum clamping voltage of SMBJ24CA-TR under a 16 A 8/20 µs surge?
The maximum clamping voltage (VCL) is 38.9 V at 16 A for an 8/20 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature per αT = 9.6 × 10−4/°C, reaching ~41.2 V at Tj = 125 °C. The device maintains this clamping performance without degradation across its full operating temperature range.
Does SMBJ24CA-TR meet automotive AEC-Q200 requirements?
No - SMBJ24CA-TR is not AEC-Q200 qualified. It is rated for industrial and commercial applications with Tj = −55 to +150 °C and complies with UL497B, IEC 61000-4-2/4-4, and J-STD-020 MSL Level 1. For automotive-grade TVS diodes, ST offers the SMAJ24CA-Q and SMCJ24CA-Q series, which undergo full AEC-Q200 stress testing.
Can SMBJ24CA-TR be used in unidirectional configurations?
No - SMBJ24CA-TR is strictly bidirectional. Its marking "BBJ" and CA suffix denote symmetrical breakdown behavior. For unidirectional protection, use SMBJ24A-TR (marked "BUJ"), which provides asymmetric clamping with cathode-anode polarity and different VBR/VCL characteristics.
What is the recommended PCB footprint for SMBJ24CA-TR?
The recommended IPC7531-compliant footprint has pad dimensions of 1.62 mm × 2.60 mm (0.064″ × 0.102″) with 5.84 mm (0.230″) center-to-center spacing. Copper area under each lead should be ≥2.5 cm² to maintain Rth(j-a) ≤ 120 °C/W and ensure 600 W pulse capability per JEDEC JESD22-A114.
SMBJ24CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, 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:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 16A
- Power - Peak Pulse:
- 600W
- 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:
- SMB
SMBJ24CA-TR FAQ
1.How can I place an order for SMBJ24CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24CA-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 SMBJ24CA-TR reliable?
The price and inventory of SMBJ24CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ24CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24CA-TR?
SMBJ24CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24CA-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 SMBJ24CA-TR?
For technical support, including SMBJ24CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24CA-TR requirements.
6.How does Aetrix verify that SMBJ24CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ24CA-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 SMBJ24CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ24CA-TR?
All SMBJ24CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24CA-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 SMBJ24CA-TR part is unused and in its original packaging.
Return procedure for SMBJ24CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24CA-TR Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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