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STMicroelectronics SMBJ26A-TR
- Part No.:
- SMBJ26A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26A-TR.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:10,801
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Product details
Overview
SMBJ26A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for primary-level surge protection on DC power rails and signal lines. It features a 26 V standoff voltage (VRM), 42.1 V clamping voltage at 14.9 A (10/1000 µs), 600 W peak pulse power rating, and operates up to 150 °C junction temperature-deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMBJ26A-TR datasheet, SMBJ26A-TR pinout, SMBJ26A-TR application, or SMBJ26A-TR equivalent, key selection criteria include clamping performance under IEC 61000-4-4 level 4 (4 kV), low leakage (<0.2 µA at 25 °C), UL497B recognition (E136224), and SMB package thermal resistance (Rth(j-a) ≈ 120 °C/W on FR4 with recommended footprint).
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low dynamic resistance (0.683 Ω at 10/1000 µs), enabling precise voltage clamping during fast transients such as ESD (±30 kV contact/air per IEC 61000-4-2) and inductive switching surges. Its unidirectional configuration provides asymmetrical protection optimized for DC-biased lines.
The device complies with UL497B as an isolated loop circuit protector and meets J-STD-020 MSL Level 1, IPC7531 footprint, and JEDEC registered SMB outline-ensuring compatibility with automated SMT assembly and long-term reliability in high-temperature environments (Tj up to 150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 26 V - Maximum continuous reverse operating voltage before conduction begins. |
| Breakdown Voltage (VBR) | 28.9–30.4 V at 1 mA - Confirmed avalanche onset range ensuring predictable turn-on margin. |
| Clamping Voltage (VCL) | 42.1 V at 14.9 A (10/1000 µs) - Limits downstream IC voltage stress during surge events. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustains short-duration energy surges without failure in standard test conditions. |
| Leakage Current (IRM) | 0.2 µA max at 25 °C - Minimizes standby power loss in battery-backed or low-power systems. |
| Junction Temperature Range | −55 to +150 °C - Supports operation in under-hood automotive and industrial ambient environments. |
| Dynamic Resistance (RD) | 0.683 Ω - Low impedance during clamping improves voltage regulation and reduces overshoot. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, single-diode configuration with cathode band marking. Dimensions: 3.30–3.95 mm length × 5.10–5.60 mm width × 2.45 mm height (JEDEC MO-136AC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path / ground reference | Connected to system ground or low-side return; defines unidirectional conduction direction. |
| Cathode | Protected line input / surge entry point | Connected to the line being protected (e.g., 24 V rail); conducts when voltage exceeds VRM. |
Key Features
| Feature | Design Value |
|---|---|
| UL497B Recognition | Approved as isolated loop circuit protector (File E136224) - Enables use in telecom and industrial safety-critical circuits without additional certification burden. |
| ESD Robustness | ±30 kV air/contact discharge (IEC 61000-4-2 level 4) - Protects microcontroller I/O and sensor interfaces against human-body-model discharges. |
| High-Temperature Stability | Rated for Tj = 150 °C with <10 ppm/°C tempco (αT = 9.7 × 10−4/°C) - Maintains clamping accuracy across extended thermal cycles. |
| Low-Leakage Planar Construction | 0.2 µA IR at 25 °C - Reduces quiescent current draw in always-on monitoring circuits and extends battery life. |
| Solderability & Reliability | Matt tin-plated leads, J-STD-002/JESD22-B102 E3 compliant - Ensures consistent reflow wetting and mitigates whisker growth in long-life deployments. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Line Clamp |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter input filter. Use Value: Clamps 42.1 V at 14.9 A to prevent MOSFET gate oxide rupture and bulk capacitor overvoltage during ISO 7637-2 pulse 5a events. | Use Scenario: CAN_H/CAN_L bus lines in BCM subjected to ESD and battery reversal transients. IC Role / Device Role / Timing Role: Unidirectional TVS on CAN_H line referenced to chassis ground; paired with SMBJ26CA on differential pair. Use Value: Limits voltage excursion to ≤42.1 V within 1 ns response time, preserving CAN transceiver common-mode range and preventing bus lockup. |
| Smart Meter AC/DC Auxiliary Supply | Factory Automation Sensor Interface Protection |
Use Scenario: Auxiliary 12 V supply derived from mains via flyback converter in utility smart meter. IC Role / Device Role / Timing Role: Secondary-side TVS protecting optocoupler input and MCU reset line from transformer-coupled surges. Use Value: Withstands 600 W (10/1000 µs) surges while maintaining <0.2 µA leakage-critical for metrology-grade low-power sleep modes. | Use Scenario: 4–20 mA current loop interface for pressure sensors in hazardous-area process controllers. IC Role / Device Role / Timing Role: Standoff-limited TVS on loop transmitter output, coordinated with intrinsically safe barrier design. Use Value: UL497B recognition ensures compliance with loop-powered instrumentation safety standards without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26A from Vishay (SMBJ26A-E3/5BT) | Identical VRM (26 V), slightly higher VCL (42.5 V @ 14.9 A), same SMB package and MSL level. | No UL497B listing; requires separate evaluation for isolated loop compliance. | Select when UL497B is not mandated and Vishay sourcing preference applies. |
| P6SMB26A from ON Semiconductor | Same VRM and VCL specs, but higher IR (1 µA @ 25 °C) and no UL497B recognition. | Lacks agency approval for telecom loop protection; limited to non-safety-critical industrial use. | Choose only for cost-sensitive designs where leakage and safety certification are secondary. |
Compared with Vishay SMBJ26A and ON Semi P6SMB26A, the STMicroelectronics SMBJ26A-TR delivers certified UL497B compliance and lower leakage-making it preferred for safety-critical isolated-loop and battery-constrained applications despite minor cost premium.
Availability
SMBJ26A-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, smart meter auxiliary supplies, and factory automation sensor interfaces requiring stable component supply and full regulatory traceability.
Supply support for SMBJ26A-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, designing and manufacturing analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The SMBJ series belongs to ST's Transient Voltage Suppressor portfolio, engineered specifically for robust, standards-compliant surge protection in harsh electromagnetic environments-targeting IEC 61000-4-2/4-4/4-5 and UL497B-certified applications.
FAQ
What is the maximum clamping voltage of SMBJ26A-TR under IEC 61000-4-4 4 kV surge conditions?
The SMBJ26A-TR clamps to 42.1 V at 14.9 A for a 10/1000 µs waveform, which corresponds to the IEC 61000-4-4 level 4 (4 kV) test condition. This value is measured at Tj = 25 °C and remains within ±5% across its full operating temperature range due to its 9.7 × 10−4/°C temperature coefficient.
Does SMBJ26A-TR require derating when mounted on a 1 oz copper PCB?
Yes-thermal resistance increases to ~120 °C/W on standard FR4 with 70 µm (2.75 oz) copper per lead. On 1 oz (35 µm) copper, Rth(j-a) rises by ~15%, reducing maximum allowable average power. Derate peak pulse power by 10% for continuous surge duty cycles exceeding 0.1 Hz at Tamb > 85 °C.
Can SMBJ26A-TR be used in bidirectional signal line protection?
No-SMBJ26A-TR is unidirectional and must be used with polarity-aware placement (cathode toward protected line). For bidirectional protection, use SMBJ26CA, which provides symmetrical clamping on both polarities and shares identical VRM, VCL, and PPP ratings.
Is the UL497B recognition applicable to both tape-and-reel and bulk packaging formats?
Yes-UL497B recognition (File E136224) applies to the device itself, not packaging format. Both SMBJ26A-TR (tape-and-reel, 2500 pcs/reel) and SMBJ26A (bulk) carry identical electrical, thermal, and safety characteristics and are covered under the same UL file number.
SMBJ26A-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:
- 1
- Bidirectional Channels:
- -
- 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
SMBJ26A-TR FAQ
1.How can I place an order for SMBJ26A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26A-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 SMBJ26A-TR reliable?
The price and inventory of SMBJ26A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26A-TR is usually 5 days.
3.What payment methods are accepted for SMBJ26A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26A-TR?
SMBJ26A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26A-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 SMBJ26A-TR?
For technical support, including SMBJ26A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26A-TR requirements.
6.How does Aetrix verify that SMBJ26A-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ26A-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 SMBJ26A-TR meets industry standards.
7.What is the process for return or replacement of SMBJ26A-TR?
All SMBJ26A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26A-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 SMBJ26A-TR part is unused and in its original packaging.
Return procedure for SMBJ26A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26A-TR Tags
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ESD9B5.0ST5G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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