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STMicroelectronics SMBJ13A-TR
- Part No.:
- SMBJ13A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ13A-TR.pdf
- Description:
- TVS DIODE 13VWM 21.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,961
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Product details
Overview
SMBJ13A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed to clamp ESD and surge transients on DC power rails and signal lines. It features 13 V standoff voltage (VRM), 21.5 V clamping voltage at 29 A (10/1000 µs), 600 W peak pulse power, 0.2 µA max leakage at 25 °C, and operates up to 150 °C junction temperature - used in industrial power supplies and automotive body control modules.
For engineers reviewing the SMBJ13A-TR datasheet, SMBJ13A-TR pinout, SMBJ13A-TR application, or SMBJ13A-TR equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, leakage impact on low-power sensor nodes, thermal derating above 85 °C, and UL497B recognition for isolated loop protection compliance.
Technical Context
This TVS diode uses planar silicon junction technology to achieve low leakage and stable breakdown characteristics across temperature. Its unidirectional configuration provides forward conduction path during negative transients while blocking reverse current until VBR = 14.4 V (min) is exceeded.
The device meets IEC 61000-4-2 level 4 (±30 kV contact/air discharge) and IEC 61000-4-4 level 4 (4 kV), with dynamic resistance of 0.191 Ω enabling rapid voltage clamping under fast-rising surges. Thermal impedance is optimized for FR4 PCBs with recommended 1.62 mm × 5.84 mm footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 13 V - Maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR min) | 14.4 V at 1 mA - Ensures reliable triggering before protected circuit exceeds absolute maximum ratings |
| Clamping Voltage (VCL) | 21.5 V at 29 A (10/1000 µs) - Limits transient voltage seen by downstream ICs during surge events |
| Peak Pulse Power | 600 W (10/1000 µs) - Sustains short-duration energy without failure in typical industrial surge profiles |
| Leakage Current (IRM) | 0.2 µA max at 13 V, 25 °C - Minimizes standby power loss in battery-powered or high-impedance sensing circuits |
| Junction Temperature Range | –55 °C to +150 °C - Supports operation in under-hood automotive and industrial motor drive environments |
| UL Recognition | UL497B (E136224) - Certified for use as isolated loop circuit protector in safety-critical telecom and industrial systems |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal device with matte tin-plated leads compliant with J-STD-020 MSL level 1 and IPC7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
| Anode | Reference node / ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VBR ≈ 1.5) | Minimizes overvoltage stress on protected ICs without requiring oversized voltage margins |
| High-temperature leakage stability | 1 µA max at 85 °C enables reliable operation in thermally constrained enclosures |
| Planar junction construction | Delivers consistent VBR and low capacitance (<100 pF at 0 V) for high-speed data line protection |
| UL497B certified isolation rating | Validates suitability for secondary-side surge protection in isolated DC-DC converters and PoE interfaces |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: 24 V DC input channels exposed to relay coil flyback and load dump transients. IC Role / Device Role: Primary overvoltage clamp on microcontroller GPIO and analog front-end inputs. Use Value: Clamps 1 kV/500 A transients to ≤22 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: LIN bus transceiver power rail protection against battery disconnection spikes. IC Role / Device Role: Unidirectional TVS on VCC supply line upstream of LIN transceiver IC. Use Value: Withstands 1000 V/10 A surge (ISO 7637-2 pulse 1) while maintaining <0.5 V droop on 12 V rail due to low dynamic resistance. |
| Telecom Power Feeds | Medical Sensor Signal Conditioning |
Use Scenario: 48 V PoE+ power entry point subject to lightning-induced surges on outdoor Ethernet links. IC Role / Device Role: First-stage clamping device before DC-DC converter input filter. Use Value: UL497B certification ensures compliance with isolated loop requirements for Class II telecom equipment safety standards. | Use Scenario: Low-noise analog front-end for EEG/ECG sensors powered from isolated 3.3 V LDO. IC Role / Device Role: Secondary-side transient suppressor on sensor amplifier supply rail. Use Value: 0.2 µA leakage avoids baseline drift in sub-µV resolution measurements; 150 °C rating supports sterilization cycle survivability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ13CA-TR | Bidirectional version; symmetric clamping (±21.5 V); higher capacitance (~120 pF) | Required for AC-coupled or bidirectional signal lines (e.g., RS-485, CAN) | Select only if protecting differential or alternating polarity signals; not drop-in for unidirectional DC rails |
| SMAJ13A-TR | Lower power rating (400 W vs. 600 W); larger VCL (23.2 V at 22 A); same SMB footprint | Suitable for less severe surge environments (IEC 61000-4-4 level 3) | Acceptable where space-constrained but surge threat is limited; verify clamping margin against protected IC's absolute max rating |
Compared with SMBJ13CA-TR and SMAJ13A-TR, SMBJ13A-TR delivers superior single-polarity surge handling for DC power rails, tighter clamping, and UL497B certification - making it preferred for industrial and automotive isolated-loop protection where unidirectional transients dominate.
Availability
SMBJ13A-TR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and telecom power feeds requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ13A-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 intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The SMBJ series belongs to ST's Transient Voltage Suppressor portfolio, engineered specifically for robust, low-leakage, high-temperature surge protection in safety-critical power and signal interfaces.
FAQ
What is the maximum surge current SMBJ13A-TR can handle without failure?
SMBJ13A-TR withstands up to 29 A (10/1000 µs waveform) at 21.5 V clamping voltage per datasheet Table 2. For 8/20 µs transients, it handles 147 A at 27.2 V. Derating applies above 85 °C ambient; Figure 3 shows 350 W capability at Tj = 150 °C.
Does SMBJ13A-TR meet automotive AEC-Q200 requirements?
No - SMBJ13A-TR is not AEC-Q200 qualified. It is rated for industrial and telecom applications with Tj = –55 °C to +150 °C, but lacks the stress testing, lot traceability, and failure analysis reporting required for automotive qualification. For AEC-Q200-compliant alternatives, consider ST's Automotive-grade SMxJ series.
Can SMBJ13A-TR be used on bidirectional data lines like RS-485?
No - SMBJ13A-TR is unidirectional and will conduct continuously if reverse-biased beyond its 13 V standoff. For RS-485, CAN, or other bidirectional interfaces, use SMBJ13CA-TR, which provides symmetrical ±13 V standoff and ±21.5 V clamping in both polarities.
How does the UL497B recognition impact system-level safety certification?
UL497B recognition (file E136224) confirms SMBJ13A-TR meets isolation barrier requirements for secondary circuits in telecom and industrial equipment. This reduces test burden during end-product UL/CSA certification by validating the device's ability to protect isolated loops from hazardous primary-side transients.
SMBJ13A-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):
- 13V
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 21.5V
- Current - Peak Pulse (10/1000µs):
- 29A
- 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
SMBJ13A-TR FAQ
1.How can I place an order for SMBJ13A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ13A-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 SMBJ13A-TR reliable?
The price and inventory of SMBJ13A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ13A-TR is usually 5 days.
3.What payment methods are accepted for SMBJ13A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ13A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ13A-TR?
SMBJ13A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ13A-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 SMBJ13A-TR?
For technical support, including SMBJ13A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ13A-TR requirements.
6.How does Aetrix verify that SMBJ13A-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ13A-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 SMBJ13A-TR meets industry standards.
7.What is the process for return or replacement of SMBJ13A-TR?
All SMBJ13A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ13A-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 SMBJ13A-TR part is unused and in its original packaging.
Return procedure for SMBJ13A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ13A-TR Tags
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