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STMicroelectronics SMBJ6.5CA-TR
- Part No.:
- SMBJ6.5CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ6.5CA-TR.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:21,684
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Product details
Overview
SMBJ6.5CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMB package, designed to clamp ESD and surge transients on signal/power lines. It features 6.5 V standoff voltage (VRM), 11.2 V clamping voltage at 56 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 - deployed in industrial I/O protection and Ethernet PHY interfaces.
For engineers reviewing the SMBJ6.5CA-TR datasheet, SMBJ6.5CA-TR pinout, SMBJ6.5CA-TR application, or SMBJ6.5CA-TR equivalent, key selection criteria include bidirectional clamping capability, low-leakage performance at elevated temperature, UL497B recognition for isolated loop circuits, and compatibility with IPC7531 footprint and JEDEC SMB outline.
Technical Context
This device implements a planar silicon avalanche structure optimized for fast response (<1 ns) and stable clamping under repetitive 8/20 µs and 10/1000 µs surges. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints.
Thermal design leverages low dynamic resistance (0.058 Ω at 10/1000 µs) and high thermal impedance tolerance (Zth(j-a) ≤ 100 °C/W on standard FR4), supporting reliable operation at Tj = 150 °C with up to 350 W derated pulse power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 6.5 V - Maximum continuous reverse working voltage before clamping initiates; defines minimum system operating margin. |
| Breakdown Voltage (VBR min) | 7.20 V at 10 mA - Guaranteed avalanche onset threshold; ensures predictable turn-on during transients. |
| Clamping Voltage (VCL) | 11.2 V at 56 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines IC survival margin. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained transient energy handling capacity at 25 °C ambient; derates to 350 W at Tj = 150 °C. |
| Leakage Current (IRM) | 0.2 µA max at VRM and 25 °C - Negligible DC loading on high-impedance signal paths; critical for sensor and precision analog inputs. |
| Junction Temperature Range | –55 °C to +150 °C - Enables deployment in harsh environments including motor drives, outdoor telecom, and automotive under-hood modules. |
| ESD Robustness | ±30 kV contact & air discharge per IEC 61000-4-2 level 4 - Exceeds industrial immunity requirements without external shielding. |
Pinout & Package
Package: SMB (DO-214AA), JEDEC registered outline, 3.3–3.95 mm width × 5.1–5.6 mm length × 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 conduction | Identifies physical orientation; both terminals are symmetrical and interchangeable in bidirectional configuration. |
| Anode (Opposite Band) | Common terminal for bidirectional conduction | No functional polarity distinction; used identically to cathode for AC or differential line protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, RS-485, CAN, or USB D+/D− lines without polarity concerns. |
| UL497B recognition (E136224) | Validated for use as isolated loop circuit protector in safety-critical industrial control systems. |
| Low dynamic resistance (0.058 Ω) | Minimizes voltage overshoot during fast-rising transients, improving protection margin for 3.3 V and 5 V logic. |
| High-temperature reliability (Tj = 150 °C) | Supports uninterrupted operation in sealed enclosures or near heat-generating components like MOSFETs or SMPS transformers. |
| IPC7531-compliant footprint | Ensures mechanical compatibility with automated PCB assembly and thermal relief design for reflow soldering. |
Applications
| Industrial PLC I/O Protection | RS-485 Transceiver Protection |
|---|---|
|
Use Scenario: 24 V DC digital input modules exposed to field-wiring induced surges and ESD events during maintenance. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to shunt transients before reaching optocoupler or MCU GPIO. Use Value: Clamps 1 kV/500 A surge (IEC 61000-4-5) to <12 V, preserving 3.3 V logic-level interface integrity and eliminating need for series current-limiting resistors. |
Use Scenario: Half-duplex RS-485 bus nodes in factory automation networks subject to cable coupling and ground potential differences. IC Role / Device Role / Timing Role: TVS connected between A/B differential lines and ground to suppress common-mode transients while maintaining signal integrity. Use Value: Sub-1 ns response prevents data corruption during 8/20 µs lightning-induced surges; low capacitance (<100 pF at 0 V) avoids signal edge degradation at 10 Mbps. |
| Industrial Ethernet PHY Interface | Smart Sensor Signal Conditioning |
|
Use Scenario: 10/100BASE-TX magnetics interface where Ethernet pairs are routed near noisy motor drives or switching power supplies. IC Role / Device Role / Timing Role: Bidirectional TVS placed across each twisted pair (MDI/MDI-X) to clamp differential and common-mode surges independently. Use Value: Maintains <1.5 dB insertion loss up to 100 MHz due to low parasitic capacitance; UL497B listing supports compliance with IEC 61850 substation communication standards. |
Use Scenario: 4–20 mA current-loop sensors in oil & gas field instrumentation exposed to lightning-induced ground rise. IC Role / Device Role / Timing Role: TVS installed across loop terminals to divert surge energy away from precision DAC/ADC front-end and HART modem. Use Value: 0.2 µA leakage at 25 °C prevents measurement drift; 150 °C rating allows mounting directly on sensor housing without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.5CA from Vishay (SMCJ6.5CA) | Same SMB package and 6.5 V VRM, but higher clamping voltage (12.3 V at 50 A) and lower PPP (400 W). | Limited suitability for 3.3 V systems due to higher VCL; acceptable for 5 V or 12 V rails with wider margin. | Select when cost sensitivity outweighs clamping performance; verify VCL margin against downstream IC absolute maximum ratings. |
| P6SMB6.5CA from ON Semiconductor | Identical VRM and VCL (11.2 V), but rated for only 400 W PPP and lacks UL497B recognition. | Not approved for isolated loop protection per UL497B; requires additional certification effort in safety-critical designs. | Preferable only for non-safety-certified consumer equipment where agency approval is not required. |
Compared with SMBJ6.5CA-TR, the Vishay alternative trades clamping performance for cost, while the ON Semiconductor part omits critical safety certification - making the STMicroelectronics device uniquely suited for industrial control systems requiring both low-VCL robustness and UL-listed isolation compliance.
Availability
SMBJ6.5CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, RS-485 transceiver hardening, and Ethernet PHY interface surge suppression requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ6.5CA-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 product line, engineered specifically for high-reliability industrial and telecom infrastructure applications demanding low-leakage, high-temperature stability, and regulatory compliance.
FAQ
What is the difference between SMBJ6.5A and SMBJ6.5CA?
The "A" suffix denotes unidirectional TVS diodes, which conduct only in reverse bias and require correct polarity installation. The "CA" suffix indicates bidirectional devices with symmetrical clamping in both polarities - essential for protecting AC-coupled or differential signal lines like RS-485 or Ethernet without polarity constraints.
Does SMBJ6.5CA-TR meet IEC 61000-4-2 level 4 ESD requirements?
Yes - it exceeds IEC 61000-4-2 level 4 with ±30 kV air and contact discharge ratings. This performance is validated per test conditions C = 150 pF and R = 330 Ω, and confirmed in ST's DS1283 datasheet Rev 14, Table 1 and Figure 5.
Can SMBJ6.5CA-TR be used in place of a unidirectional TVS in a DC power rail?
Yes, but with reduced efficiency: bidirectional devices exhibit slightly higher leakage and clamping voltage than equivalent unidirectional types. For pure DC rails, SMBJ6.5A offers tighter VCL (10.3 V vs. 11.2 V) and lower IRM - however, SMBJ6.5CA remains functionally safe if VCL margin permits.
What is the recommended PCB footprint for SMBJ6.5CA-TR?
ST specifies an IPC7531-compliant footprint: 2.60 mm pad length × 1.62 mm pad width, 5.84 mm center-to-center spacing, with 2.07 mm solder mask opening. This layout ensures optimal thermal dissipation and mechanical reliability during reflow, as detailed in Figure 14 of DS1283 Rev 14.
SMBJ6.5CA-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):
- 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
SMBJ6.5CA-TR FAQ
1.How can I place an order for SMBJ6.5CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ6.5CA-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 SMBJ6.5CA-TR reliable?
The price and inventory of SMBJ6.5CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ6.5CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ6.5CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ6.5CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ6.5CA-TR?
SMBJ6.5CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ6.5CA-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 SMBJ6.5CA-TR?
For technical support, including SMBJ6.5CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ6.5CA-TR requirements.
6.How does Aetrix verify that SMBJ6.5CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ6.5CA-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 SMBJ6.5CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ6.5CA-TR?
All SMBJ6.5CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ6.5CA-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 SMBJ6.5CA-TR part is unused and in its original packaging.
Return procedure for SMBJ6.5CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ6.5CA-TR Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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