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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > Mixed Technology

Semtech Corporation STF203-15.TCT

Name: STF203-15.TCT
Brand: Semtech Corporation
SKU: STF203-15.TCT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STF203-15.TCT

Manufacturer:: Semtech Corporation

Category:: Mixed Technology

Package:: 6-TSSOP, SC-88, SOT-363

Datasheet:: STF203-15.TCT.pdf

Description:: TVS DEVICE MIXED SC-70-6

Quantity:: RFQ Add To RFQ list

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Inventory:8,656

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Product details

Overview

STF203-15.TCT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.

For engineers reviewing the STF203-15.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for flat voltage response, DFN-6 package layout constraints, and compatibility with 22V bus systems requiring robust surge immunity per IEC 61000-4-5.

Technical Context

The STF203-15.TCT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and turns on the shunt path to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-from 24A to 40A peak pulse current due to decreasing R_DS(on) under surge conditions.

It operates across –40°C to +125°C, with stable clamping performance verified over temperature and rated for 1120W peak pulse power. The device is optimized for unsymmetrical line protection, supporting ±1kV (1.2/50μs, R_S = 42Ω) surge compliance and ±4kV EFT immunity per IEC 61000-4-4.

Key Specifications

Parameter	Value and Actual Design Meaning
Working Voltage	22V - defines maximum continuous DC operating voltage of protected line without leakage or conduction.
Clamping Voltage	27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, R_S = 2Ω) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge.
Peak Pulse Current	40A (8/20μs) - supports industrial-level lightning/surge immunity per IEC 61000-4-5 Level 3/4.
Dynamic Resistance	20mΩ - enables flat clamping response; reduces voltage rise ΔV = I_PP × R_DYN under increasing surge current.
Junction Capacitance	175pF at 22V, 1MHz - low enough for VBus protection without signal integrity impact; not suitable for high-speed data lines.
ESD Withstand	±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements for connector-facing protection.
Operating Temp	–40°C to +125°C - enables deployment in extended-temperature industrial and automotive edge applications.

Pinout & Package

STF203-15.TCT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. All six terminals are surface-mount; thermal dissipation occurs through copper traces-not an exposed thermal pad.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	GND	Common ground return path for surge current; all three must be connected with low-inductance routing to maximize 40A capability.
4, 5, 6	IN	Protected line input (e.g., VBus); pins are internally paralleled-must be shorted externally for full surge rating.

Key Features

Feature	Design Value
Constant-clamp architecture	Clamping voltage varies ≤0.5V from 24A to 40A-enables predictable protection margin without over-spec'ing IPP.
FET-based shunt topology	Replaces junction-limited TVS with low-R_DS(on) switching; eliminates thermal runaway risk at elevated ambient temperatures.
Temperature-stable clamping	Clamps at ~27.5V across –40°C to +125°C-avoids derating or guardbanding required with conventional TVS devices.
High-energy surge handling	1120W peak pulse power rating supports repeated 40A surges without parameter shift or degradation.
Low-leakage protection	600nA max reverse leakage at 22V-minimizes standby power loss in battery-powered IoT and portable equipment.

Applications

USB Type-C Power Delivery Bus Protection	Industrial Load Switch Input Protection
Use Scenario: Protecting 20–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller/load switch; responds within nanoseconds to divert transients. Use Value: Maintains clamping at 27.5–28V across full temperature range-prevents overvoltage damage to 24V-tolerant PD controllers without thermal derating.	Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient clamp limiting voltage seen by internal FET gate oxide and overvoltage protection circuitry. Use Value: Keeps clamping voltage below 30V-ensures load switch remains within absolute maximum ratings during ±1kV surge events.
IoT Device Power Rail Protection	Notebook/Tablet Main Power Input
Use Scenario: Securing 12–22V DC input rails in battery-backed smart sensors and edge gateways subjected to field ESD and coupling noise. IC Role / Device Role / Timing Role: Standalone transient suppressor on main power entry point; coordinates with upstream fuse and downstream LDOs. Use Value: 175pF capacitance avoids interference with PMIC sequencing; ±30kV ESD rating covers handheld handling and docking events.	Use Scenario: Protecting 19–20V adapter-input rails in ultrabooks and 2-in-1 tablets where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Compact, low-profile clamp mounted adjacent to DC jack to minimize trace inductance before system power management ICs. Use Value: 1.6mm × 1.6mm footprint saves >50% board area vs. SOD-323 TVS solutions while delivering superior clamping consistency.

USB Type-C Power Delivery Bus Protection

Industrial Load Switch Input Protection

Use Scenario: Protecting 20–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to ESD and lightning-induced surges.

IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller/load switch; responds within nanoseconds to divert transients.

Use Value: Maintains clamping at 27.5–28V across full temperature range-prevents overvoltage damage to 24V-tolerant PD controllers without thermal derating.

Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems.

IC Role / Device Role / Timing Role: Front-end transient clamp limiting voltage seen by internal FET gate oxide and overvoltage protection circuitry.

Use Value: Keeps clamping voltage below 30V-ensures load switch remains within absolute maximum ratings during ±1kV surge events.

IoT Device Power Rail Protection

Notebook/Tablet Main Power Input

Use Scenario: Securing 12–22V DC input rails in battery-backed smart sensors and edge gateways subjected to field ESD and coupling noise.

IC Role / Device Role / Timing Role: Standalone transient suppressor on main power entry point; coordinates with upstream fuse and downstream LDOs.

Use Value: 175pF capacitance avoids interference with PMIC sequencing; ±30kV ESD rating covers handheld handling and docking events.

Use Scenario: Protecting 19–20V adapter-input rails in ultrabooks and 2-in-1 tablets where space and thermal headroom are constrained.

IC Role / Device Role / Timing Role: Compact, low-profile clamp mounted adjacent to DC jack to minimize trace inductance before system power management ICs.

Use Value: 1.6mm × 1.6mm footprint saves >50% board area vs. SOD-323 TVS solutions while delivering superior clamping consistency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDS2211P	Identical electrical specs, same DFN-6 package, identical marking and reel packaging; STF203-15.TCT is Semtech's alternate part number for TDS2211P.	No functional difference; used interchangeably in BOMs and layouts.	Select STF203-15.TCT when sourcing from distributors listing this variant; no design or layout changes required.
uClamp2411ZA	24V working voltage, lower 20A IPP rating, higher 33V clamping at 20A, smaller 0.6mm × 0.6mm DFN-2 package, 0.25pF capacitance.	Targeted at CC/SBU lines-not suitable for VBus or power rail protection due to lower surge rating and higher clamping.	Use uClamp2411ZA only for low-capacitance, low-energy signal-line protection; not a substitute for STF203-15.TCT in power rail roles.

Compared with TDS2211P, STF203-15.TCT is a direct form-fit-function equivalent with identical specifications and package; compared with uClamp2411ZA, it delivers 2× peak current handling and 5V lower clamping-making it the sole viable option for 22V power rail EOS protection.

Availability

STF203-15.TCT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT device power inputs requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for STF203-15.TCT 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

Semtech Corporation is a U.S.-based fabless semiconductor company specializing in high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity.

The STF203-15.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability power rail protection where flat clamping, temperature stability, and high surge endurance are critical.

FAQ

What is the exact package type and dimensions of STF203-15.TCT?

STF203-15.TCT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper terminals but no thermal pad. Pin 1 is marked by a laser dot; pins 1–3 are GND, and pins 4–6 are the protected input node. The land pattern follows Semtech's recommended 0.30mm pad width and 0.50mm pitch layout.

Does STF203-15.TCT meet IEC 61000-4-5 surge immunity standards?

Yes, STF203-15.TCT is rated for ±1kV (1.2/50μs voltage waveform, R_S = 42Ω, C_S = 0.5μF) on unsymmetrical lines and supports 40A (8/20μs) peak pulse current-meeting IEC 61000-4-5 Level 3 and Level 4 requirements for industrial environments. Its 27.5–28V clamping ensures protected ICs stay within safe operating limits.

How does STF203-15.TCT differ from standard TVS diodes in clamping behavior?

Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (V_C = V_BR + I_PP × R_DYN), STF203-15.TCT uses a triggered FET shunt that maintains near-constant clamping-27.5–28V from 24A to 40A-due to decreasing R_DS(on). This eliminates thermal derating and provides predictable protection margins across temperature and current.

Can STF203-15.TCT be used on high-speed data lines like USB SuperSpeed?

No, STF203-15.TCT is not suitable for USB SuperSpeed (TX/RX), DisplayPort, or HDMI data lines. Its 175pF junction capacitance would severely degrade signal integrity. For those lines, Semtech recommends ultra-low-capacitance devices like RClamp3371ZC (<0.25pF); STF203-15.TCT is strictly intended for VBus, CC, SBU, or power rail protection.

Is STF203-15.TCT RoHS and REACH compliant?

Yes, STF203-15.TCT is Pb-free, halogen-free, and fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Its molding compound meets UL 94V-0 flammability rating, and lead finish is 100% matte tin.

STF203-15.TCT Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Package/Case:: 6-TSSOP, SC-88, SOT-363

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Clamping:: -

Technology:: Mixed Technology

Number of Circuits:: 4

Applications:: General Purpose

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-6

STF203-15.TCT FAQ

1.How can I place an order for STF203-15.TCT through Aetrix?

Please submit a Request for Quotation (RFQ) for STF203-15.TCT 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 STF203-15.TCT reliable?

The price and inventory of STF203-15.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF203-15.TCT is usually 5 days.

3.What payment methods are accepted for STF203-15.TCT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF203-15.TCT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STF203-15.TCT?

STF203-15.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STF203-15.TCT 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 STF203-15.TCT?

For technical support, including STF203-15.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF203-15.TCT requirements.

6.How does Aetrix verify that STF203-15.TCT is sourced from the original manufacturer or authorized distributors?

All STF203-15.TCT 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 STF203-15.TCT meets industry standards.

7.What is the process for return or replacement of STF203-15.TCT?

All STF203-15.TCT units undergo pre-shipment inspection (PSI). If there is an issue with STF203-15.TCT, 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 STF203-15.TCT part is unused and in its original packaging.

Return procedure for STF203-15.TCT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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