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onsemi SM05T1G
- Part No.:
- SM05T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SM05T1G.pdf
- Description:
- TVS DIODE 5VWM 9.8VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:47,245
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM05T1G from onsemi is a dual common-anode ESD protection diode array in SOT-23 package, rated for 5.0 V working peak reverse voltage, 300 W peak pulse power (8/20 µs), and ±15 kV air/±26 kV contact ESD immunity. It protects two I/O lines simultaneously in space-constrained interfaces such as USB, keyboard, or microprocessor bus lines.
For engineers reviewing the SM05T1G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (9.8 V @ 1 A), low leakage (10 µA @ 5 V), dual-cathode configuration, and UL 94 V-0 flammability rating - all critical for high-density transient suppression in industrial and computing systems.
Technical Context
The SM05T1G implements a monolithic dual-junction silicon structure with shared anode (Pin 3) and separate cathodes (Pins 1 and 2), enabling independent unidirectional protection of two signal paths. Its design supports either two discrete unidirectional channels or a single bidirectional configuration via external routing.
It meets IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (lightning surge) standards with verified 12 A surge current capability and 225 pF typical capacitance at 0 V bias - optimized for data-line integrity in sub-10 MHz digital interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage | 5.0 V - defines maximum continuous DC or AC RMS voltage before conduction begins on each channel |
| Clamping Voltage @ 1 A | 9.8 V - maximum voltage seen by protected circuit during 8/20 µs surge event at 1 A peak |
| Peak Pulse Power | 300 W - transient energy handling capacity per channel under standardized 8/20 µs waveform |
| ESD Withstand (IEC 61000-4-2) | ±15 kV air / ±26 kV contact - ensures robustness against human-body-model electrostatic discharge events |
| Reverse Leakage Current | 10 µA @ VRWM - minimal signal loading and power loss during normal operation |
| Capacitance @ 0 V | 225 pF - limits high-frequency signal distortion on protected lines up to ~10 MHz bandwidth |
| Package | SOT-23 (Case 318, Style 12) - surface-mount footprint measuring 2.90 × 1.30 × 1.00 mm for high-density PCB layout |
Pinout & Package
SOT-23 package (Case 318, Style 12) with void-free thermosetting plastic case, corrosion-resistant finish, and Pb-free construction. Rated for 260°C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Channel A) | Protected line input for first unidirectional ESD path; connects to I/O trace requiring clamping to GND |
| Pin 2 | Cathode (Channel B) | Protected line input for second independent unidirectional ESD path; enables dual-line protection in one footprint |
| Pin 3 | Anode (Common) | Shared return node tied to system ground or local reference plane; establishes common clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel common-anode topology | Enables simultaneous protection of two signal lines without inter-channel coupling or shared cathode routing constraints |
| UL 94 V-0 flammability rating | Confirms self-extinguishing behavior under flame exposure - required for safety-certified industrial and medical enclosures |
| Low clamping voltage (9.8 V) | Ensures downstream ICs (e.g., 5 V logic, USB transceivers) remain within absolute maximum ratings during surge events |
| Pb-free and RoHS-compliant construction | Meets global environmental compliance mandates and eliminates lead contamination risk in reflow and end-of-life processing |
| Optimized for automated board assembly | Standardized SOT-23 pitch (1.90 mm) and coplanarity support high-yield pick-and-place and reflow soldering |
Applications
| USB 2.0 Interface Protection | Industrial Keypad ESD Shielding |
|---|---|
Use Scenario: Protecting D+ and D− differential pair in embedded USB host/device ports against ESD events during plug/unplug cycles. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and PHY, with common anode grounded. Use Value: Clamps transients to ≤9.8 V while adding only 225 pF capacitance - preserves signal integrity up to 480 Mbps without impedance discontinuity. | Use Scenario: Guarding matrix-scanned keypad rows/columns in factory HMIs exposed to operator touch-induced ESD. IC Role / Device Role / Timing Role: Dual-line protector where Pins 1 and 2 connect to adjacent scan lines, Pin 3 to chassis ground. Use Value: Eliminates need for two discrete diodes, saving 1.5 mm² PCB area and reducing BOM count in space-limited front-panel designs. |
| Microcontroller GPIO Bus Protection | Printer Parallel Port Surge Suppression |
Use Scenario: Safeguarding multiple MCU GPIO pins (e.g., UART TX/RX, SPI MOSI/MISO) sharing common ground in compact IoT edge nodes. IC Role / Device Role / Timing Role: Common-anode TVS array providing coordinated clamping across two I/Os referenced to same GND net. Use Value: Prevents latch-up or gate oxide damage during field ESD events while maintaining <10 µA standby leakage for battery-powered operation. | Use Scenario: Hardening legacy Centronics-style parallel port signals (STROBE, ACK, BUSY) in office printers subjected to cable-discharge events. IC Role / Device Role / Timing Role: Dual-channel suppressor installed at connector entry point, with cathodes on signal lines and anode on chassis ground. Use Value: Withstands 12 A lightning-surge pulses per IEC 61000-4-5, preventing interface lockup or firmware corruption during power-line disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | Lower capacitance (12 pF), lower clamping (7.5 V @ 1 A), but 150 W peak power rating | Better suited for high-speed USB 3.0 or HDMI; insufficient for 12 A lightning surge per IEC 61000-4-5 | Select when signal bandwidth >50 MHz dominates over surge robustness requirements |
| SMAJ5.0A | Single-channel, DO-214AC package, higher clamping (11.2 V @ 12.5 A), 400 W rating | Requires two devices for dual-line protection; larger footprint (4.5 × 3.2 mm vs. 2.9 × 1.3 mm) | Choose when higher surge margin is needed and board area is not constrained |
Compared with TPD2E001DRYR and SMAJ5.0A, the SM05T1G uniquely balances dual-line integration, 300 W surge capability, and SOT-23 miniaturization - making it optimal for cost-sensitive, space-limited 5 V digital interfaces requiring full IEC 61000-4-x compliance.
Availability
SM05T1G is available at Aetrix Electronics and suitable for USB interface protection, industrial keypad shielding, microcontroller GPIO bus hardening, and printer parallel port surge suppression requiring stable component supply and long-term production continuity.
Supply support for SM05T1G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SM05T1G belongs to onsemi's transient voltage suppression diode family designed specifically for board-level ESD and surge protection in high-density digital systems - emphasizing low capacitance, precise clamping, and compact packaging.
FAQ
What is the exact pin configuration of the SM05T1G?
The SM05T1G uses SOT-23 package Style 12: Pin 1 is Cathode (Channel A), Pin 2 is Cathode (Channel B), and Pin 3 is the Common Anode. This dual-cathode/common-anode arrangement enables independent protection of two signal lines referenced to a shared ground node - confirmed in the official onsemi datasheet revision 11 (September 2024) and mechanical outline CASE 318.
Does the SM05T1G meet AEC-Q101 qualification?
No - the SM05T1G is not AEC-Q101 qualified. Only the SZ-prefix variants (e.g., SZSM05T1G) carry AEC-Q101 qualification and PPAP capability per the onsemi datasheet. The SM05T1G is intended for commercial and industrial applications, not automotive-grade deployment.
What is the clamping voltage of the SM05T1G at 1 A surge current?
The SM05T1G has a maximum clamping voltage of 9.8 V at 1 A peak pulse current (8/20 µs waveform), as specified in the Electrical Characteristics table on page 2 of the official onsemi datasheet. This value ensures protected 5 V logic circuits remain within safe operating limits during ESD and surge events.
Can the SM05T1G be used for bidirectional signal lines like RS-485?
No - the SM05T1G is a unidirectional device with common-anode architecture, designed for clamping positive transients to ground. For true bidirectional protection (e.g., RS-485), a dedicated bidirectional TVS array or back-to-back diode configuration is required; the SM05T1G does not support symmetrical clamping above and below ground.
What is the thermal resistance junction-to-ambient for the SM05T1G on FR-5 board?
The SM05T1G has a thermal resistance (RJA) of 556 °C/W when mounted on an FR-5 board (1.0 × 0.75 × 0.62 in.), with total power dissipation derated above 25°C at 1.8 mW/°C. This value is critical for estimating temperature rise during repetitive surge events and is documented in the Maximum Ratings table on page 2 of the onsemi SM05T1G datasheet.
SM05T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6.2V
- Voltage - Clamping (Max) @ Ipp:
- 9.8V
- Current - Peak Pulse (10/1000µs):
- 17A (8/20µs)
- Power - Peak Pulse:
- 300W
- 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:
- SOT-23-3 (TO-236)
SM05T1G FAQ
1.How can I place an order for SM05T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SM05T1G 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 SM05T1G reliable?
The price and inventory of SM05T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM05T1G is usually 5 days.
3.What payment methods are accepted for SM05T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM05T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM05T1G?
SM05T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM05T1G 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 SM05T1G?
For technical support, including SM05T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM05T1G requirements.
6.How does Aetrix verify that SM05T1G is sourced from the original manufacturer or authorized distributors?
All SM05T1G 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 SM05T1G meets industry standards.
7.What is the process for return or replacement of SM05T1G?
All SM05T1G units undergo pre-shipment inspection (PSI). If there is an issue with SM05T1G, 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 SM05T1G part is unused and in its original packaging.
Return procedure for SM05T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM05T1G 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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Toshiba Semiconductor and Storage
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Diodes Incorporated
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