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STMicroelectronics SM6T10A
- Part No.:
- SM6T10A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T10A.pdf
- Description:
- TVS DIODE 8.55VWM 14.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:33,675
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Product details
Overview
SM6T10A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed for IEC 61000-4-2 ESD protection and IEC 61000-4-4 surge suppression on signal/power lines. It features 10 V breakdown voltage (VBR min = 8.55 V), 14.5 V clamping voltage (VCL) at 41 A peak pulse current, 600 W peak pulse power (10/1000 µs), and operates up to 150 °C junction temperature - deployed in industrial sensor interfaces and DC power rail protection.
For engineers reviewing the SM6T10A datasheet, SM6T10A pinout, SM6T10A application, or SM6T10A equivalent, this page delivers verified electrical parameters, SMB package layout, real-world clamping behavior under 8/20 µs and 10/1000 µs transients, low-leakage performance at elevated temperature, and direct alternatives with documented VBR, VCL, and IPP differences.
Technical Context
The SM6T10A uses planar silicon avalanche technology to achieve precise reverse breakdown at 8.55–10.5 V (25 °C), with temperature coefficient αT = 7.3 × 10−4/°C. Its dynamic resistance RD = 0.098 Ω enables tight clamping during fast transients.
It meets UL497B recognition (E136224) as an isolated loop circuit protector and exceeds IEC 61000-4-2 Level 4 (±30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (4 kV). Leakage remains ≤1 μA at 85 °C and rated stand-off voltage (VRM = 10 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 8.55 V at 1 mA - ensures reliable turn-on before downstream IC damage threshold |
| VCL @ IPP = 41 A | 14.5 V (10/1000 µs) - limits protected line voltage to safe level during surge |
| IPP (max) | 41 A (10/1000 µs), 215 A (8/20 µs) - defines maximum transient energy it can absorb without failure |
| RD | 0.098 Ω - low dynamic resistance minimizes VCL rise under high-current surges |
| IR @ VRM | 1 μA at 85 °C - ultra-low leakage preserves signal integrity in high-impedance circuits |
| Tj max | 150 °C - supports operation in thermally constrained industrial enclosures and SMPS |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with IPC7531-compliant footprint |
Pinout & Package
SMB (DO-214AA) package: 2-terminal surface-mount device with cathode band marking; dimensions per JEDEC MS-012 (A1 = 1.90–2.45 mm, D = 3.30–3.95 mm, E = 5.10–5.60 mm); matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; carries full surge current during clamping |
| Cathode | Protected line input | Connected to signal/power line being safeguarded; avalanche conduction begins here when VRM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 Level 4 compliance | ±30 kV contact/air discharge - eliminates need for external ESD staging in industrial HMI designs |
| UL497B recognition | Agency file E136224 - qualifies for use in telecom and process control loop-powered systems requiring certified isolation |
| Low Tj-dependent leakage | ≤1 μA at 85 °C and VRM - maintains accuracy in precision analog front-ends over full operating range |
| High-power capability at Tj = 150 °C | 350 W (10/1000 µs) - sustains surge immunity in hot-running power supplies and motor drives |
| Fast response time | <1 ns - reacts before most microcontroller I/O pins enter destructive latch-up |
Applications
| Industrial Sensor Interface | DC Power Rail Protection |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop transmitters against field-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS placed between loop+ and ground to clamp induced transients before reaching op-amp input stage. Use Value: Clamps 41 A surges to ≤14.5 V, preserving 24 V loop headroom while meeting IEC 61000-4-4 Level 4 immunity requirements. | Use Scenario: Safeguarding 12 V DC input rails of PLC I/O modules exposed to relay coil kickback and lightning-induced coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across rail-to-ground to shunt inductive spikes before LDO or MCU power pins. Use Value: Absorbs 600 W (10/1000 µs) pulses without degradation, enabling robust operation in electrically noisy plant environments. |
| Automotive Body Control Module | Smart Meter Communication Port |
Use Scenario: ESD protection on LIN bus lines in BCMs subjected to assembly-line handling and service technician contact. IC Role / Device Role / Timing Role: TVS placed inline with LIN transceiver RX/TX pins to suppress ±30 kV discharges per IEC 61000-4-2. Use Value: Sub-1 ns response prevents data corruption during human-body-model events, maintaining LIN protocol timing integrity. | Use Scenario: Surge hardening of RS-485 ports in utility smart meters installed in outdoor meter boxes. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (with series resistor) guarding differential pair against 4 kV ring-wave transients. Use Value: Withstands repeated 8/20 µs surges up to 215 A while maintaining <15 V differential clamping - critical for RS-485 receiver survival. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ10A | VBR min = 8.5 V, VCL = 15.4 V @ 38.8 A, RD = 0.12 Ω - slightly higher clamping and lower IPP | Lower peak power rating (400 W vs. 600 W) - less suitable for high-energy inductive switching events | Prefer SM6T10A where >400 W surge margin or UL497B certification is required |
| P6SMB10A | VBR min = 8.55 V, VCL = 14.5 V @ 41.2 A, RD = 0.095 Ω - near-identical clamping but no UL497B listing | Lacks UL497B recognition - not approved for isolated loop protection in safety-critical instrumentation | Select SM6T10A when regulatory compliance for loop-powered systems is mandatory |
Compared with SMAJ10A and P6SMB10A, SM6T10A offers superior 600 W surge rating, UL497B certification for loop isolation, and tighter thermal stability - making it preferred for industrial control and certified measurement equipment where reliability and compliance are non-negotiable.
Availability
SM6T10A is available at Aetrix Electronics and suitable for industrial sensor interfaces, DC power rail protection, automotive body control modules, and smart meter communication ports requiring stable component supply and long-term lifecycle support.
Supply support for SM6T10A 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 automotive, industrial, and power discrete solutions with emphasis on reliability and environmental compliance.
The SM6T series belongs to ST's transient protection portfolio, engineered specifically for high-reliability industrial and telecom applications demanding low-leakage, high-temperature operation, and regulatory-certified surge immunity.
FAQ
What is the maximum clamping voltage of SM6T10A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 14.5 V at 41 A peak pulse current for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature per αT = 7.3 × 10−4/°C, reaching ~15.2 V at Tj = 125 °C.
Does SM6T10A meet UL497B requirements for isolated loop protection?
Yes - SM6T10A is recognized by Underwriters Laboratories to UL497B as an isolated loop circuit protector under agency file number E136224, covering both unidirectional and bidirectional variants in the SM6TxxA/CA family.
How does leakage current change with temperature?
At VRM = 10 V, leakage current is ≤0.2 μA at 25 °C and rises to ≤1 μA at 85 °C. The datasheet curve (Figure 9) shows exponential increase beyond 100 °C, remaining below 10 μA at Tj = 150 °C - confirming suitability for high-temperature SMPS designs.
Can SM6T10A be used in bidirectional configurations?
No - SM6T10A is unidirectional only. For bidirectional protection, use SM6T10CA (marked LP), which has symmetric breakdown in both polarities and identical VBR, VCL, and IPP ratings - confirmed in Table 2 and ordering code mapping.
SM6T10A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.55V
- Voltage - Breakdown (Min):
- 9.5V
- Voltage - Clamping (Max) @ Ipp:
- 14.5V
- Current - Peak Pulse (10/1000µs):
- 41A
- 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
SM6T10A FAQ
1.How can I place an order for SM6T10A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T10A 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 SM6T10A reliable?
The price and inventory of SM6T10A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T10A is usually 5 days.
3.What payment methods are accepted for SM6T10A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T10A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T10A?
SM6T10A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T10A 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 SM6T10A?
For technical support, including SM6T10A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T10A requirements.
6.How does Aetrix verify that SM6T10A is sourced from the original manufacturer or authorized distributors?
All SM6T10A 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 SM6T10A meets industry standards.
7.What is the process for return or replacement of SM6T10A?
All SM6T10A units undergo pre-shipment inspection (PSI). If there is an issue with SM6T10A, 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 SM6T10A part is unused and in its original packaging.
Return procedure for SM6T10A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T10A Tags
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