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STMicroelectronics SM6T16A
- Part No.:
- SM6T16A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T16A.pdf
- Description:
- TVS DIODE SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,291
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Product details
Overview
SM6T16A 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 16 V standoff voltage (VRM), 21.2 V clamping voltage at 14.5 A (10/1000 µs), and 600 W peak pulse power. Used to protect MOSFET gates, USB data lines, and industrial sensor interfaces against fast transients.
For engineers reviewing the SM6T16A datasheet, SM6T16A pinout, SM6T16A application, or SM6T16A equivalent, this page delivers verified electrical parameters, real-world clamping behavior, thermal derating curves, UL497B recognition status, and direct substitution guidance - all critical for robust overvoltage protection design in automotive body electronics, PLC I/O modules, and AC-DC power supply front-ends.
Technical Context
The SM6T16A employs planar silicon junction technology optimized for low leakage (≤1 μA at 85 °C) and high junction temperature operation (Tj up to +150 °C). Its dynamic resistance of 0.193 Ω enables tight clamping during 10/1000 µs surges, while its 10.4 × 10⁻⁴/°C temperature coefficient ensures predictable VBR drift across operating range.
It meets UL497B recognition as an isolated loop circuit protector (file E136224), complies with IEC 61000-4-2 level 4 (30 kV), and supports JEDEC-standard SMB footprint with IPC7531-compliant land pattern. Solderability is certified per J-STD-002, JESD22-B102 E3, and MIL-STD-750 method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 16 V - Maximum continuous reverse working voltage before significant leakage begins; sets minimum system operating margin. |
| Breakdown Voltage (VBR) | 17.1–18.9 V at 1 mA - Confirmed avalanche onset range; defines precise triggering threshold under DC stress. |
| Clamping Voltage (VCL) | 21.2 V at 14.5 A (10/1000 µs) - Peak voltage seen by protected IC during worst-case surge; directly limits stress on downstream components. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy-handling capability at ambient; derates to 350 W at Tj = 150 °C per Figure 3. |
| Leakage Current (IRM) | 0.2 μA at 25 °C, 1 μA at 85 °C - Ultra-low reverse current preserves signal integrity in high-impedance analog/sensor paths. |
| Response Time | <1 ns - Sub-nanosecond junction response ensures protection before ESD or lightning-induced transients propagate into ICs. |
| Operating Junction Temp | −55 to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
SMB (DO-214AA) surface-mount package: 3.3–3.95 mm length, 5.1–5.6 mm width, 1.9–2.45 mm height, matte tin-plated leads compliant with J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Current Sink | Connected to protected line; conducts transient energy to ground when voltage exceeds VBR. |
| Anode | Reference Node | Tied to system ground or lower-potential rail; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| UL497B Recognition | Approved as isolated loop circuit protector (E136224); satisfies safety-critical telecom and industrial isolation requirements. |
| Low-Temperature Leakage | 0.2 μA max at 25 °C - minimizes standby power loss and avoids false triggering in battery-powered sensor nodes. |
| High-Temp Clamping Stability | VCL drift <±5% from −55 to +150 °C - maintains consistent protection margin across full automotive temperature range. |
| ESD Robustness | 30 kV contact/air discharge per IEC 61000-4-2 - exceeds level 4, enabling single-device protection for USB 2.0, RS-485, and CAN FD interfaces. |
| Thermal Derating Curve | 600 W → 350 W between 25 °C and 150 °C junction temp - enables accurate lifetime prediction in thermally constrained PCB layouts. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop transmitters from load dump and inductive switching spikes in factory automation systems. IC Role / Device Role / Timing Role: TVS diode placed across input terminals to clamp transients before they reach precision op-amps and ADCs. Use Value: 21.2 V clamping at 14.5 A prevents damage to 24 V-rated signal conditioning ICs during 100 V/500 ms load dump events. | Use Scenario: Safeguarding LIN bus transceivers and door module microcontrollers against ESD and alternator ripple in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and chassis ground to absorb 30 kV ESD pulses without disrupting 19.2 kbps signaling. Use Value: Sub-1 ns response ensures clamping occurs within first 100 ps of ESD event, preserving bus arbitration timing and preventing bit errors. |
| AC-DC Power Supply Input | PLC Digital I/O Channel |
Use Scenario: Secondary-side surge protection for 12 V auxiliary rails feeding isolated gate drivers and optocouplers in switch-mode power supplies. IC Role / Device Role / Timing Role: Placed after bridge rectifier and bulk capacitor to suppress differential-mode surges induced by nearby relay switching. Use Value: 600 W (10/1000 µs) rating handles repetitive 1 kV/2 Ω ring wave surges per IEC 61000-4-5 without degradation over 10⁵ cycles. | Use Scenario: Input protection for 24 V digital inputs on programmable logic controllers exposed to field wiring faults and electrostatic discharge. IC Role / Device Role / Timing Role: Mounted directly at terminal block to shunt transients before they enter input buffer ICs and microcontroller GPIO pins. Use Value: 16 V VRM matches standard 24 V nominal supply with 20% tolerance, ensuring no false triggering during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A | Same SMB package, but 600 W rating at 25 °C only; no UL497B recognition; higher IRM (1 μA @ 25 °C vs. 0.2 μA). | Lacks UL497B certification; not approved for isolated loop protection in telecom or safety-critical industrial systems. | Select SMAJ16A only for cost-sensitive consumer-grade designs where UL compliance is not required. |
| P6SMB16A | Identical electrical specs and UL497B file number (E136224); same 16 V VRM, 21.2 V VCL, and 600 W PPP; minor marking variation. | No functional difference; qualified to identical standards and used interchangeably in ST's own reference designs. | P6SMB16A is a second-source equivalent with identical performance and compliance - suitable for dual-sourcing strategies. |
Compared with SMAJ16A and P6SMB16A, SM6T16A offers superior low-temperature leakage (0.2 μA vs. 1 μA), guaranteed UL497B recognition for isolated circuits, and tighter VBR tolerance (17.1–18.9 V vs. ±5%), making it preferred for high-reliability industrial and automotive applications requiring long-term stability and regulatory traceability.
Availability
SM6T16A is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and AC-DC power supply input applications requiring stable component supply, long-lifecycle support, and UL-certified surge protection.
Supply support for SM6T16A 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, designing and manufacturing analog, MCU, power, and sensing solutions for automotive, industrial, and consumer markets.
The SM6T series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust ESD and surge protection in harsh environments - emphasizing low leakage, high-temperature stability, and regulatory compliance for mission-critical infrastructure.
FAQ
What is the maximum clamping voltage of SM6T16A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM6T16A is 21.2 V at 14.5 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a rate of 10.4 × 10⁻⁴/°C, reaching ~22.3 V at Tj = 125 °C per the αT coefficient in Table 2.
Does SM6T16A meet UL497B requirements for isolated loop protection?
Yes, SM6T16A is recognized to UL497B as an isolated loop circuit protector under agency file number E136224. This certification applies to both unidirectional (A) and bidirectional (CA) variants and validates its use in telecom line interface circuits and safety-isolated industrial I/O systems.
Can SM6T16A be used in bidirectional signal lines like RS-485?
No - SM6T16A is unidirectional and must be used with cathode toward the protected line and anode to ground. For bidirectional lines such as RS-485, the bidirectional variant SM6T16CA is required, which provides symmetrical clamping in both polarities without polarity constraints.
What is the recommended PCB footprint for SM6T16A?
The recommended footprint follows IPC7531 and JEDEC MO-136 standards: 5.84 mm pad length, 2.07 mm pad width, 1.62 mm solder mask opening, and 2.60 mm center-to-center spacing. Copper area under each lead should exceed 1 cm² to maintain Rth(j-a) ≤ 120 °C/W per Figure 12.
SM6T16A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- 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
SM6T16A FAQ
1.How can I place an order for SM6T16A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T16A 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 SM6T16A reliable?
The price and inventory of SM6T16A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T16A is usually 5 days.
3.What payment methods are accepted for SM6T16A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T16A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T16A?
SM6T16A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T16A 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 SM6T16A?
For technical support, including SM6T16A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T16A requirements.
6.How does Aetrix verify that SM6T16A is sourced from the original manufacturer or authorized distributors?
All SM6T16A 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 SM6T16A meets industry standards.
7.What is the process for return or replacement of SM6T16A?
All SM6T16A units undergo pre-shipment inspection (PSI). If there is an issue with SM6T16A, 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 SM6T16A part is unused and in its original packaging.
Return procedure for SM6T16A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T16A Tags
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