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onsemi SM15T1G
- Part No.:
- SM15T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SM15T1G.pdf
- Description:
- TVS DIODE 15VWM 24VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:27,146
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Product details
Overview
SM15T1G from onsemi is a dual common-anode ESD protection diode array in SOT-23 package, designed for transient overvoltage and electrostatic discharge protection of two signal lines. It features 15 V working peak reverse voltage, 24 V clamping voltage at 1 A peak pulse current, 100 pF typical capacitance at 0 V, 300 W peak pulse power (8/20 µs), and low 1.0 µA reverse leakage. It is widely used in USB, HDMI, and serial interface protection where board space is constrained.
For engineers reviewing the SM15T1G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 1 A surge, bidirectional/unidirectional configuration flexibility in SOT-23, IEC 61000-4-2 ±26 kV contact ESD rating, thermal performance on FR-5 vs. alumina substrates, and Pb-free compliance with UL 94 V-0 flammability rating.
Technical Context
The SM15T1G implements a monolithic dual-junction silicon diode structure with shared anode (Pin 3) and separate cathodes (Pins 1 and 2), enabling independent protection of two unidirectional signal paths or combined bidirectional operation. Its design targets fast response to ESD transients (sub-nanosecond turn-on) and robust energy absorption per IEC 61000-4-5 lightning surges (12 A, 8/20 µs).
It operates within −55 °C to +150 °C junction temperature range and supports automated SMT assembly with 260 °C soldering tolerance (10 s). Thermal resistance is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate - critical for sustained surge duty cycle planning in compact industrial interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin for protected lines. |
| VC @ IPP = 1 A | 24 V - Clamping voltage during 8/20 µs surge; determines maximum voltage seen by downstream ICs during ESD event. |
| IPP Max | 10 A - Peak pulse current capability per line; sets surge handling limit per IEC 61000-4-5 Level 3 (12 A) derated for dual-line sharing. |
| C @ 0 V | 100 pF - Junction capacitance per channel; impacts high-speed signal integrity (e.g., limits usable bandwidth in USB 2.0 < 480 Mbps). |
| Ppk | 300 W - Non-repetitive peak pulse power (8/20 µs); defines single-event energy absorption capacity without failure. |
| IR @ VRWM | 1.0 µA - Reverse leakage at rated working voltage; ensures minimal standby power loss and signal loading in battery-powered systems. |
| ESD Rating | ±26 kV contact per IEC 61000-4-2 - Confirmed immunity level for direct human-body model discharge into protected pins. |
Pinout & Package
SOT-23 (TO-236) package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish. Designed for high-density automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Channel A) | Protected signal line input for first unidirectional path; connects to I/O trace requiring ESD clamp to common anode. |
| Pin 2 | Cathode (Channel B) | Protected signal line input for second independent unidirectional path; enables dual-line protection in single footprint. |
| Pin 3 | Common Anode | Shared connection point tied to system ground or reference rail; establishes common return for both clamping diodes. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel common-anode topology | Enables two independent signal lines to share one ground-referenced clamp, reducing PCB real estate by 50% vs. discrete diodes. |
| SOT-23 bidirectional/unidirectional flexibility | Same package supports either two unidirectional protections (Pins 1–3 and 2–3) or one bidirectional path (Pins 1–2), simplifying BOM consolidation. |
| 100 pF capacitance @ 0 V | Preserves signal integrity for medium-speed digital interfaces (e.g., RS-485, CAN FD up to 5 Mbps) without excessive rise-time degradation. |
| AEC-Q101 qualified (SZ-prefix variant) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress - applicable to industrial control modules requiring extended lifetime. |
| UL 94 V-0 flammability rating | Ensures self-extinguishing behavior under fault-induced overheating, meeting safety requirements for medical and office equipment enclosures. |
Applications
| USB 2.0 Data Lines (D+/D−) | HDMI TMDS Channels |
|---|---|
Use Scenario: Protecting differential USB 2.0 data pairs against ESD events during hot-plug insertion or handling in peripheral devices. IC Role / Device Role: Unidirectional transient voltage suppressor placed between each data line and chassis ground. Use Value: Limits clamped voltage to ≤24 V during ±26 kV contact discharge, preventing damage to USB transceivers while maintaining <100 pF loading for 480 Mbps signaling. | Use Scenario: Safeguarding HDMI TMDS clock and data channels from ESD in consumer AV receivers and display adapters. IC Role / Device Role: Dual-channel clamp with shared ground reference, installed per TMDS pair (clock + data) on source/sink side. Use Value: Delivers 24 V clamping at 1 A with 100 pF capacitance, preserving signal edge rates required for 1080p/60 Hz video transmission without jitter increase. |
| Industrial RS-485 Transceiver Ports | Medical Sensor Interface Lines |
Use Scenario: Shielding half-duplex RS-485 bus lines (A/B) from induced surges in factory automation networks. IC Role / Device Role: Common-anode TVS array connected between A/B lines and local ground plane near connector entry point. Use Value: Absorbs 300 W transient energy (8/20 µs), clamps to 24 V, and withstands repeated IEC 61000-4-4 EFT bursts (40 A) without degradation. | Use Scenario: Protecting analog sensor inputs (e.g., thermocouple, pressure bridge) in portable diagnostic equipment from operator ESD. IC Role / Device Role: Low-leakage (1.0 µA) unidirectional clamp on each sensor line referenced to isolated analog ground. Use Value: Prevents baseline shift or ADC saturation during ±15 kV air discharge while introducing negligible offset error due to ultra-low IR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM15T3G | Same electrical specs but supplied in 13-inch/10,000-unit tape-and-reel (vs. 7-inch/3,000-unit for SM15T1G); identical SOT-23 package and marking. | No functional difference; intended for high-volume production runs requiring larger reel quantities. | Select SM15T3G when ordering ≥10,000 units to reduce changeover frequency and optimize SMT line uptime. |
| TPD2E001DRYR | Lower clamping voltage (12 V @ 1 A), lower capacitance (11 pF), but lower peak power (200 W); dual-channel, same SOT-23 footprint. | Better suited for high-speed interfaces (e.g., USB 3.0, MIPI) where capacitance must be <15 pF; less robust for lightning-level surges. | Choose TPD2E001DRYR only if signal bandwidth >1 GHz and surge threat is limited to ESD (not EFT/lightning); verify layout grounding matches TI's recommended layout. |
Compared with SM15T1G, SM15T3G offers identical protection performance with optimized logistics for volume manufacturing, while TPD2E001DRYR trades surge robustness for ultra-low capacitance - making SM15T1G the balanced choice for industrial USB/RS-485 where 24 V clamping and 300 W pulse handling are mandatory.
Availability
SM15T1G is available at Aetrix Electronics and suitable for USB interface protection, industrial RS-485 port hardening, and medical sensor line safeguarding requiring stable component supply across long-lifecycle product programs.
Supply support for SM15T1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SM05T1G Series - including SM15T1G - is engineered specifically for board-level ESD and transient suppression in space-constrained, high-reliability electronic systems, emphasizing low capacitance, repeatable clamping, and AEC-Q101 readiness.
FAQ
What is the clamping voltage of SM15T1G at 1 A peak pulse current?
The SM15T1G has a maximum clamping voltage (VC) of 24 V when subjected to a 1 A peak pulse current with an 8/20 µs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures downstream ICs remain within safe operating voltage limits during surge events. The SM15T1G datasheet specifies this parameter under "Electrical Characteristics" with test current IT = 1.0 A.
Is SM15T1G suitable for bidirectional signal lines like RS-485?
Yes, SM15T1G can protect bidirectional lines such as RS-485 A/B differential pairs by connecting Pins 1 and 2 to the respective lines and Pin 3 to ground - forming a symmetrical clamp. Its dual common-anode architecture allows effective suppression of both positive and negative transients without polarity constraints, provided layout minimizes ground inductance to maintain clamping fidelity.
Does SM15T1G meet automotive qualification standards?
The base SM15T1G is not AEC-Q101 qualified; however, the SZSM15T1G variant - with "SZ" prefix - is fully AEC-Q101 qualified and PPAP capable. Both share identical electrical and mechanical specifications, differing only in traceability, process controls, and automotive-specific testing. For automotive applications, specify SZSM15T1G to ensure compliance.
What is the thermal resistance of SM15T1G on a standard FR-5 PCB?
SM15T1G exhibits a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on a standard FR-5 board (1.0 × 0.75 × 0.62 in.). This value governs steady-state power dissipation limits - for example, at 25 °C ambient, total power must stay below 225 mW to avoid exceeding TJmax. Derating is required above 25 °C at 1.8 mW/°C.
Can SM15T1G replace SM12T1G or SM24T1G in the same footprint?
Yes, all SMxT1G devices share identical SOT-23 package, pinout, and mechanical dimensions - enabling direct substitution based on required VRWM. SM15T1G (15 V VRWM) fits between SM12T1G (12 V) and SM24T1G (24 V). Select according to system operating voltage margin: e.g., use SM15T1G for 12 V nominal buses needing ~25% headroom, verified via VC and VBR tolerances in actual layout.
SM15T1G 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 10A (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)
SM15T1G FAQ
1.How can I place an order for SM15T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T1G 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 SM15T1G reliable?
The price and inventory of SM15T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T1G is usually 5 days.
3.What payment methods are accepted for SM15T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T1G?
SM15T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T1G 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 SM15T1G?
For technical support, including SM15T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T1G requirements.
6.How does Aetrix verify that SM15T1G is sourced from the original manufacturer or authorized distributors?
All SM15T1G 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 SM15T1G meets industry standards.
7.What is the process for return or replacement of SM15T1G?
All SM15T1G units undergo pre-shipment inspection (PSI). If there is an issue with SM15T1G, 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 SM15T1G part is unused and in its original packaging.
Return procedure for SM15T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T1G 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
-
D12V0L1B2LP-7B
Diodes Incorporated
-
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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