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STMicroelectronics SMBJ10A-TR
- Part No.:
- SMBJ10A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ10A-TR.pdf
- Description:
- TVS DIODE 10VWM 17VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:21,287
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Product details
Overview
SMBJ10A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact) and IEC 61000-4-4 surge immunity (4 kV level 4). It features 10 V standoff voltage (VRM), 17 V clamping voltage at 37 A (10/1000 µs), 600 W peak pulse power, and 0.2 µA leakage at 25 °C - deployed on DC power rails and signal lines of industrial PLCs, telecom interfaces, and automotive body control modules.
For engineers reviewing the SMBJ10A-TR datasheet, SMBJ10A-TR pinout, SMBJ10A-TR application, or SMBJ10A-TR equivalent, this page delivers verified electrical parameters, real-world clamping behavior under 10/1000 µs transients, thermal derating curves up to 150 °C junction temperature, and direct comparison with functionally aligned TVS alternatives for overvoltage hardening of 12 V supply domains.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below 10 V reverse standoff (VRM), then avalanches sharply above 11.1 V (VBR min) to clamp transient energy into ground. Its planar junction structure enables low leakage (≤1 µA at 85 °C) and stable dynamic resistance (0.127 Ω at 10/1000 µs), critical for maintaining signal integrity during repeated ESD events.
It complies with UL497B (file E136224) for isolated loop circuit protection and meets IEC 61000-4-2 level 4 (30 kV) and IEC 61000-4-4 level 4 (4 kV), with thermal performance validated across -55 °C to +150 °C operating junction range and 260 °C soldering tolerance per J-STD-020 MSL level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 10 V - maximum continuous reverse voltage before conduction begins; sets minimum system operating margin for 12 V rail protection. |
| Breakdown Voltage (VBR) | 11.1–11.7 V at 1 mA - precise avalanche initiation threshold enabling predictable clamping onset without premature leakage. |
| Clamping Voltage (VCL) | 17 V at 37 A (10/1000 µs) - limits downstream IC stress to safe levels during 600 W surges; verified at Tj = 25 °C. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - defines maximum transient energy absorption capability before failure. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - ensures minimal standby power loss and signal distortion in always-on circuits. |
| Junction Temperature (Tj) | -55 to +150 °C - supports operation in under-hood automotive and industrial environments without thermal shutdown. |
| ESD Rating | 30 kV contact & air discharge (IEC 61000-4-2) - exceeds level 4 requirements for human-body-model robustness. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, JEDEC registered outline, IPC7531 footprint compliant. Dimensions: 3.30–3.95 mm (D) × 5.10–5.60 mm (E) × 1.90–2.45 mm (A1), weight 0.11 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference node | Tied to system ground or lowest potential reference; completes shunt path for clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VBR ≈ 1.53) | Minimizes voltage overshoot during fast transients, reducing risk of latch-up in downstream 12 V logic. |
| High junction temperature rating (150 °C) | Enables reliable operation in thermally constrained enclosures like motor drives and power supplies. |
| UL497B recognition (E136224) | Validates suitability for isolated loop protection in safety-critical industrial control systems. |
| Dynamic resistance (RD = 0.127 Ω) | Ensures consistent clamping performance across pulse durations from 10 µs to 1 ms. |
| MSL level 1 moisture sensitivity | Allows board assembly without dry-pack or baking, reducing manufacturing cost and handling complexity. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input channels exposed to relay coil flyback and ESD from operator touch panels. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between input terminal and chassis ground to clamp transients before reaching isolation amplifiers and microcontroller GPIO. Use Value: Limits voltage to ≤17 V during 37 A surges, preventing damage to 3.3 V/5 V interface ICs while maintaining <0.2 µA leakage at ambient temperature. |
Use Scenario: 12 V supply rail feeding door lock actuators, window lift motors, and interior lighting drivers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main BCM power input, positioned upstream of DC-DC converters and LDOs. Use Value: Absorbs 600 W (10/1000 µs) load-dump spikes and 4 kV IEC 61000-4-4 surges without degradation, supporting ASIL-B functional safety compliance. |
| Telecom Ethernet PHY Interface | Smart Meter Power Supply Input |
|
Use Scenario: Protection of RJ45 magnetics secondary side against lightning-induced surges and hot-plug ESD. IC Role / Device Role / Timing Role: Secondary-side TVS on 3.3 V bias rail feeding Ethernet PHY IC, coordinated with common-mode chokes. Use Value: Clamps 30 kV ESD events within 1 ns response time, preserving signal integrity on 100BASE-TX differential pairs. |
Use Scenario: AC/DC adapter output stage protecting metering SoC and RTC backup circuitry from grid transients. IC Role / Device Role / Timing Role: Final-stage transient suppressor on regulated 3.3 V or 5 V rail, after bulk filtering and before low-dropout regulator. Use Value: Maintains <1 µA leakage at 85 °C ambient, avoiding battery drain in lithium coin-cell-backed real-time clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ10CA-TR | Bidirectional variant; symmetric clamping (±17 V) vs. unidirectional (17 V only on cathode-to-anode). | Required where AC-coupled signals or bidirectional data lines (e.g., RS-485) need symmetrical surge suppression. | Select only if circuit requires equal positive/negative transient protection; otherwise SMBJ10A-TR offers lower leakage and tighter VBR tolerance. |
| 1.5SMC10A | Same VRM/VBR but in larger SMC package; higher thermal mass yields 1500 W (10/1000 µs) rating vs. 600 W. | Suitable for high-energy surge zones (e.g., mains input filters) where PCB space permits larger footprint. | Choose when peak power demand exceeds 600 W; SMBJ10A-TR is preferred for space-constrained 12 V rail point-of-load protection. |
Compared with SMBJ10CA-TR, SMBJ10A-TR provides lower leakage and optimized unidirectional clamping for DC rails; versus 1.5SMC10A, it trades peak power for 40% smaller PCB area and faster response in compact designs.
Availability
SMBJ10A-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom Ethernet PHY interfaces, and smart meter power supply inputs requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ10A-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 specializing in power management, analog, MEMS, and microcontrollers, with R&D centers across Europe, Asia, and the Americas.
The SMBJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability ESD and surge suppression in industrial automation, automotive electronics, and communications infrastructure.
FAQ
What is the maximum clamping voltage of SMBJ10A-TR under a 10/1000 µs surge?
The maximum clamping voltage is 17 V at 37 A for a 10/1000 µs waveform, measured at 25 °C junction temperature. This value increases linearly with junction temperature at 7.8 × 10⁻⁴ V/°C per the αT coefficient, reaching ~18.2 V at 150 °C.
Can SMBJ10A-TR be used in bidirectional signal lines like RS-485?
No - SMBJ10A-TR is unidirectional and conducts only when cathode voltage exceeds anode by >11.1 V. For bidirectional lines, use SMBJ10CA-TR, which clamps symmetrically at ±11.1 V and maintains identical 17 V clamping in both polarities.
How does SMBJ10A-TR compare to SMAJ10A in terms of surge handling?
SMBJ10A-TR delivers 600 W (10/1000 µs) vs. SMAJ10A's 400 W due to its larger SMB package thermal mass and lower dynamic resistance (0.127 Ω vs. ~0.2 Ω). Both share identical electrical specs, but SMBJ supports higher sustained surge duty cycles.
Is SMBJ10A-TR compliant with RoHS and REACH regulations?
Yes - it is manufactured in ST's ECOPACK2-compliant facilities, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free matte tin plating and halogen-free molding compound per IEC 61249-2-21.
SMBJ10A-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):
- 10V
- Voltage - Breakdown (Min):
- 11.1V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- Current - Peak Pulse (10/1000µs):
- 37A
- 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
SMBJ10A-TR FAQ
1.How can I place an order for SMBJ10A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ10A-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 SMBJ10A-TR reliable?
The price and inventory of SMBJ10A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ10A-TR is usually 5 days.
3.What payment methods are accepted for SMBJ10A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ10A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ10A-TR?
SMBJ10A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ10A-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 SMBJ10A-TR?
For technical support, including SMBJ10A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ10A-TR requirements.
6.How does Aetrix verify that SMBJ10A-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ10A-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 SMBJ10A-TR meets industry standards.
7.What is the process for return or replacement of SMBJ10A-TR?
All SMBJ10A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ10A-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 SMBJ10A-TR part is unused and in its original packaging.
Return procedure for SMBJ10A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ10A-TR Tags
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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