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STMicroelectronics SMBJ26CA-TR
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- Part No.:
- SMBJ26CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26CA-TR.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:11,640
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Product details
Overview
SMBJ26CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMB package, designed for IEC 61000-4-2 ESD and IEC 61000-4-4 surge protection of signal/power lines. It features 26 V standoff voltage (VRM), 42.1 V clamping voltage at 14.9 A (10/1000 µs), 600 W peak pulse power, 0.2 µA max leakage at 25 °C, and 150 °C junction temperature rating - deployed in industrial PLC I/O modules, telecom line interfaces, and automotive body control units.
For engineers reviewing the SMBJ26CA-TR datasheet, SMBJ26CA-TR pinout, SMBJ26CA-TR application, or SMBJ26CA-TR equivalent, key selection criteria include bidirectional clamping symmetry, low dynamic resistance (0.683 Ω), UL497B recognition (E136224), IEC 61000-4-2 level 4 compliance (30 kV contact/air), and SMB footprint compatibility with IPC7531.
Technical Context
This bidirectional TVS operates as a voltage-clamped shunt protector across differential or single-ended lines. Its planar junction structure enables stable leakage performance up to 150 °C and fast response (<1 ns) to transients, with symmetrical breakdown in both polarities - critical for protecting RS-485, CAN FD, and Ethernet PHY interfaces against induced surges and ESD.
Clamping behavior is defined by VCL = 42.1 V at IPP = 14.9 A (10/1000 µs), with dynamic resistance RD = 0.683 Ω and temperature coefficient αT = 9.7 × 10−4/°C. It meets MIL-STD-883 method 3015 and IEC 61000-4-5 surge immunity requirements when used with appropriate series impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 26 V - Maximum continuous reverse operating voltage before conduction begins |
| Clamping Voltage (VCL) | 42.1 V at 14.9 A (10/1000 µs) - Peak voltage seen by protected circuit during surge |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained surge energy handling at Tj = 25 °C |
| Leakage Current (IRM) | 0.2 µA max at 26 V, 25 °C - Minimal loading on high-impedance signal paths |
| Junction Temperature (Tj) | −55 to +150 °C - Enables operation in under-hood automotive or industrial ambient environments |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact & air) - Full Level 4 immunity without external shielding |
| UL Recognition | UL497B, File E136224 - Certified for isolated loop circuit protection in safety-critical systems |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, JEDEC-registered outline, 3.3–3.95 mm width × 5.1–5.6 mm length × 1.9–2.45 mm height, matte tin-plated leads compliant with J-STD-020 MSL level 1 and JESD 22-B102 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Common terminal for bidirectional clamping | Identifies polarity reference; in bidirectional devices, both terminals are functionally symmetric but marked for orientation consistency |
| Anode | Common terminal for bidirectional clamping | Electrically identical to cathode in CA-type; forms symmetrical avalanche path for ± transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Matched VBR and VCL in both directions ensures consistent protection on AC-coupled or differential lines like RS-485 |
| Low dynamic resistance | 0.683 Ω minimizes voltage overshoot during fast-rising transients (e.g., lightning-induced surges) |
| High-temperature reliability | Rated for 150 °C Tj with <0.2 µA leakage at 25 °C and <1 µA at 85 °C supports long-term stability in sealed enclosures |
| UL497B certification | Recognized as isolated loop circuit protector (File E136224) - eliminates need for additional safety review in industrial safety systems |
| IEC 61000-4-2 Level 4 compliance | Withstands 30 kV contact and air discharge without degradation - suitable for unshielded field-deployed equipment |
Applications
| Industrial PLC Analog I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop inputs from load dump and ESD in factory-floor PLC racks exposed to welding equipment and motor drives. IC Role / Device Role / Timing Role: Shunt clamping device placed directly at connector entry point, limiting transient voltage to ≤42.1 V before reaching precision ADC front-end. Use Value: Prevents latch-up and parametric drift in instrumentation amplifiers by maintaining sub-45 V stress during 1 kV/µs surges per IEC 61000-4-4. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in BCMs subjected to ISO 7637-2 pulse 1/2a/5a and ESD events during service access. IC Role / Device Role / Timing Role: Bidirectional TVS placed across LIN data pair (LIN_H/L), clamping both positive and negative transients symmetrically. Use Value: Ensures >100,000 mating cycles without degradation due to low leakage and robust planar junction design. |
| Telecom DSL Line Interface | Medical Patient Monitoring Port |
Use Scenario: Guarding ADSL/VDSL line drivers and receivers against lightning-induced surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: Primary surge suppressor in hybrid protection circuit (with gas discharge tube and series impedance), absorbing first 600 W of energy. Use Value: Clamps to 42.1 V within <1 ns, preventing damage to 3.3 V or 5 V PHY ICs while maintaining signal integrity up to 30 MHz. | Use Scenario: Protecting ECG/SpO₂ analog front-ends connected to reusable patient cables prone to static discharge during clinical handling. IC Role / Device Role / Timing Role: Low-leakage (0.2 µA) bidirectional clamp placed at connector PCB entry, preserving DC accuracy of microvolt-level biopotential signals. Use Value: Meets IEC 60601-1-2 ESD immunity without adding noise or offset error to sensitive amplifier stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA from Vishay (SMCJ26CA) | Same VRM (26 V), slightly higher VCL (43.5 V @ 14.5 A), 600 W rating, SMB package | Marginally higher clamping increases stress on downstream ICs; requires revalidation of worst-case voltage margin | Select only if existing Vishay qualification exists and clamping margin permits |
| P6SMB26CA from ON Semiconductor | Identical VRM (26 V), same VCL (42.1 V), 600 W, SMB package, but rated for 175 °C Tj max | Higher thermal capability allows tighter layout in thermally constrained medical enclosures | Prefer for designs requiring extended high-temperature derating or legacy ON BOM alignment |
Compared with SMBJ26CA-TR, the Vishay alternative trades marginally higher clamping for identical form factor, while the ON Semiconductor variant offers extended junction temperature range (175 °C vs. 150 °C) at no cost to surge performance - enabling more compact thermal design in sealed medical or automotive modules.
Availability
SMBJ26CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom DSL line interfaces, and medical patient monitoring ports requiring stable component supply and full IEC/UL compliance.
Supply support for SMBJ26CA-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, delivering silicon solutions for smart driving, power management, sensing, connectivity, and microcontrollers.
The SMBJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability industrial, automotive, and medical applications where low leakage, bidirectional symmetry, and certified safety compliance are mandatory design requirements.
FAQ
What is the difference between SMBJ26CA and SMBJ26A?
SMBJ26CA is bidirectional - it clamps symmetrically for both positive and negative transients, making it ideal for AC-coupled or differential signal lines like RS-485 or LIN. SMBJ26A is unidirectional and conducts only in one direction, requiring correct polarity placement and typically used on DC power rails or single-ended signals with known polarity. Their marking codes (BBK vs. BUK) and internal junction structures differ accordingly.
Does SMBJ26CA-TR meet automotive AEC-Q200 requirements?
No - SMBJ26CA-TR is not AEC-Q200 qualified. It is rated for industrial and commercial temperature ranges (−55 to +150 °C) and carries UL497B and IEC 61000-4-2/4-4 certifications, but lacks the stress testing, failure analysis, and qualification documentation required for automotive-grade components. For AEC-Q200-compliant alternatives, consider ST's Automotive TVS family (e.g., SMAJ26CA-Q).
Can SMBJ26CA-TR be used in parallel to increase surge current handling?
No - paralleling TVS diodes like SMBJ26CA-TR is not recommended due to mismatched dynamic resistance and avalanche turn-on characteristics, which cause uneven current sharing and potential thermal runaway. To handle higher surge currents, select a higher-power device (e.g., 1500 W SMCJ26CA) or implement staged protection with GDT + TVS architecture instead.
What is the significance of the "-TR" suffix in SMBJ26CA-TR?
The "-TR" suffix indicates tape-and-reel packaging: 2500 units per 13-inch reel, conforming to EIA-481 standards. This format supports automated SMT assembly, includes leader/trailer sections for machine indexing, and ensures moisture-sensitive level 1 handling per J-STD-020 - eliminating bake requirements prior to reflow soldering.
SMBJ26CA-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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 14.9A
- 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
SMBJ26CA-TR FAQ
1.How can I place an order for SMBJ26CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26CA-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 SMBJ26CA-TR reliable?
The price and inventory of SMBJ26CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ26CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26CA-TR?
SMBJ26CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26CA-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 SMBJ26CA-TR?
For technical support, including SMBJ26CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26CA-TR requirements.
6.How does Aetrix verify that SMBJ26CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ26CA-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 SMBJ26CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ26CA-TR?
All SMBJ26CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26CA-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 SMBJ26CA-TR part is unused and in its original packaging.
Return procedure for SMBJ26CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26CA-TR Tags
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