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STMicroelectronics SMBJ6.5A-TR
- Part No.:
- SMBJ6.5A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ6.5A-TR.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,992
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Product details
Overview
SMBJ6.5A-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 a 6.5 V standoff voltage (VRM), 11.2 V clamping voltage at 56 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 I/O protection.
For engineers reviewing the SMBJ6.5A-TR datasheet, SMBJ6.5A-TR pinout, SMBJ6.5A-TR application, or SMBJ6.5A-TR equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, leakage current at elevated temperature, UL497B recognition for isolated loop circuits, and thermal derating above 25 °C ambient.
Technical Context
This TVS diode uses planar silicon junction technology to achieve low leakage (≤0.2 μA at 25 °C) and stable breakdown characteristics across temperature. Its unidirectional configuration provides forward conduction path during overvoltage events while blocking reverse current under normal operation.
The device complies with IEC 61000-4-2 (±30 kV air/contact discharge) and IEC 61000-4-4 (4 kV level 4), with dynamic resistance of 0.058 Ω enabling fast response (<1 ns) and precise clamping. UL497B recognition (file E136224) confirms suitability for isolated loop circuit protection in safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 6.5 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum margin above nominal rail voltage. |
| Breakdown Voltage (VBR min) | 7.20 V at 10 mA - Guaranteed minimum avalanche initiation voltage; ensures reliable triggering before protected IC exceeds absolute max rating. |
| Clamping Voltage (VCL) | 11.2 V at 56 A (10/1000 µs) - Peak voltage seen by downstream circuit during worst-case surge; defines safe headroom for 12 V systems. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained transient energy absorption capability at 25 °C; derates to 350 W at 150 °C junction temperature. |
| Leakage Current (IRM) | ≤0.2 μA at 25 °C, ≤1 μA at 85 °C - Minimal parasitic loading on high-impedance sensor or reference circuits; critical for battery-powered nodes. |
| Junction Temperature Range | −55 °C to +150 °C - Enables deployment in under-hood automotive or industrial SMPS environments without thermal shutdown risk. |
| UL Recognition | UL497B (E136224) - Certified for use as isolated loop circuit protector; satisfies regulatory requirements for functional safety interfaces. |
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) | Surge current sink node | Connected to protected line; conducts transient energy to ground when voltage exceeds VBR; polarity-sensitive for unidirectional operation. |
| Anode | Reference/ground return | Tied to system ground or low-impedance return path; completes clamping loop; must maintain low-inductance layout for effective ESD suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VBR ≈ 1.56) | Minimizes overvoltage stress on downstream MOSFETs or microcontrollers during 8/20 µs lightning surges. |
| High-temperature leakage stability | 1 μA max at 85 °C enables reliable long-term operation in thermally constrained enclosures without false triggering. |
| UL497B certified isolation rating | Validates use in telecom/data line interfaces where galvanic isolation integrity must be maintained during surge events. |
| Planar junction construction | Delivers consistent VBR tolerance (±5%) and low dynamic resistance (0.058 Ω), ensuring repeatable clamping performance across production lots. |
| JEDEC-registered SMB outline | Ensures mechanical compatibility with automated pick-and-place equipment and standard reflow profiles (peak 240–245 °C). |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module I/O |
|---|---|
|
Use Scenario: 12 V DC input rail exposed to load dump and jump-start transients in programmable logic controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp positive-going surges before they reach upstream DC-DC controller. Use Value: Clamps to 11.2 V at 56 A, protecting 16 V-rated buck controller ICs while maintaining <0.2 μA standby leakage to preserve low-power sleep mode. |
Use Scenario: LIN bus transceiver pins subjected to ESD events during vehicle assembly and service operations. IC Role / Device Role / Timing Role: Standoff-limited TVS on LIN data line, leveraging 6.5 V VRM to avoid interfering with 12 V supply while suppressing ±30 kV contact discharges. Use Value: Sub-1 ns response time and 0.058 Ω dynamic resistance limit voltage overshoot to within transceiver's 40 V abs-max spec during IEC 61000-4-2 testing. |
| Telecom Isolated Data Line Protection | Medical Sensor Interface Protection |
|
Use Scenario: RS-485 interface in remote monitoring units powered via isolated DC-DC converters with floating grounds. IC Role / Device Role / Timing Role: UL497B-recognized TVS on isolated side of data line to protect transceiver without compromising galvanic isolation barrier integrity. Use Value: E136224 certification validates compliance with isolated loop safety requirements, eliminating need for additional creepage/clearance analysis. |
Use Scenario: Analog front-end of portable ECG monitor connected to patient electrodes susceptible to electrostatic discharge. IC Role / Device Role / Timing Role: Low-leakage TVS on amplifier input stage to suppress ESD without degrading DC offset accuracy or common-mode rejection. Use Value: 0.2 μA max leakage at 25 °C prevents input bias current errors in high-gain, low-noise instrumentation amplifiers used in sub-mV signal conditioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.5CA-TR | Bidirectional version with symmetric ±6.5 V standoff; same VCL (11.2 V) and PPP (600 W) ratings. | Required for AC-coupled or differential signal lines (e.g., CAN, RS-485) where both polarities must be clamped. | Select only if bidirectional protection is needed; unidirectional SMBJ6.5A-TR offers lower leakage and simpler grounding in DC rail applications. |
| SMBJ6.0A-TR | Lower VRM (6.0 V); slightly lower VCL (10.3 V at 61 A); tighter VBR range (6.70–7.05 V). | Better suited for 5 V systems with narrow margin between rail and IC abs-max (e.g., USB PHY protection). | Choose when protecting 5 V logic; SMBJ6.5A-TR is preferred for 12 V rails where higher VRM avoids false triggering during ripple or startup overshoot. |
Compared with SMBJ6.5CA-TR, SMBJ6.5A-TR delivers lower leakage and simplified layout for DC rails; versus SMBJ6.0A-TR, it provides greater margin against 12 V rail transients while maintaining identical package and thermal performance.
Availability
SMBJ6.5A-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom isolated data interfaces, and medical sensor front-ends requiring stable component supply and full traceability.
Supply support for SMBJ6.5A-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 robust ESD and surge immunity in harsh electromagnetic environments - targeting reliability-critical applications where failure modes must be predictable and fail-safe.
FAQ
What is the maximum allowable junction temperature for SMBJ6.5A-TR during surge events?
The absolute maximum operating junction temperature is +150 °C. At this temperature, the device maintains 350 W peak pulse power capability (10/1000 µs), verified per Figure 3 in DS1283 Rev 14. Thermal design must ensure junction temperature remains below this limit during repetitive surge conditions using recommended PCB copper area per Figure 12.
Does SMBJ6.5A-TR meet IEC 61000-4-2 level 4 for ESD immunity?
Yes - it exceeds IEC 61000-4-2 level 4 with ±30 kV air discharge and ±30 kV contact discharge performance, confirmed in Table 1 and Section 1.1 of DS1283. This rating applies at 25 °C ambient with standard test setup (C = 150 pF, R = 330 Ω), and is validated by ST's internal qualification testing.
How does the dynamic resistance (RD) of 0.058 Ω affect clamping performance?
A dynamic resistance of 0.058 Ω means voltage rise across the TVS increases by ~0.058 V per ampere of surge current beyond the rated IPP. This low RD ensures tight clamping control - for example, at 50 A surge, VCL rises only ~2.9 V above the 11.2 V baseline, keeping protected circuits well within safe operating limits.
Is SMBJ6.5A-TR compatible with lead-free reflow soldering processes?
Yes - it is qualified for lead-free reflow per JEDEC J-STD-020 MSL Level 1, with peak temperature tolerance up to 245 °C (see Figure 22). The matte tin-plated leads meet JESD 22-B102 E3 and MIL-STD-750 Method 2026, ensuring reliable wetting and intermetallic formation without voiding or dewetting.
SMBJ6.5A-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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.2V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 56A
- 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
SMBJ6.5A-TR FAQ
1.How can I place an order for SMBJ6.5A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ6.5A-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 SMBJ6.5A-TR reliable?
The price and inventory of SMBJ6.5A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ6.5A-TR is usually 5 days.
3.What payment methods are accepted for SMBJ6.5A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ6.5A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ6.5A-TR?
SMBJ6.5A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ6.5A-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 SMBJ6.5A-TR?
For technical support, including SMBJ6.5A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ6.5A-TR requirements.
6.How does Aetrix verify that SMBJ6.5A-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ6.5A-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 SMBJ6.5A-TR meets industry standards.
7.What is the process for return or replacement of SMBJ6.5A-TR?
All SMBJ6.5A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ6.5A-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 SMBJ6.5A-TR part is unused and in its original packaging.
Return procedure for SMBJ6.5A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ6.5A-TR Tags
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