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

Semtech Corporation STF203-22.TCT

Name: STF203-22.TCT
Brand: Semtech Corporation
SKU: STF203-22.TCT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STF203-22.TCT

Manufacturer:: Semtech Corporation

Category:: Mixed Technology

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

Datasheet:: STF203-22.TCT.pdf

Description:: TVS DEVICE MIXED SC-70-6

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STF203-22.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 - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.

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

Technical Context

The STF203-22.TCT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant - 27.5–28V - across 24A to 40A peak pulse current and from –40°C to +125°C operating temperature.

This behavior stems from the FET's decreasing R_DS(on) under surge, yielding ultra-low dynamic resistance (20mΩ) and eliminating the linear V_C = V_BR + I_PP × R_DYN dependency seen in PN-junction TVS devices. The architecture enables reliable protection for sensitive 22V USB PD controllers and load switches without derating at elevated temperatures.

Key Specifications

Parameter	Value and Actual Design Meaning
Working Voltage	22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or conduction.
Clamping Voltage	27.5–28V at 40A (8/20μs) - ensures downstream 22V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge.
Peak Pulse Current	40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial and USB PD applications.
ESD Withstand	±30kV contact & air (IEC 61000-4-2) - provides robust handling-level ESD protection without degradation.
Dynamic Resistance	20mΩ - minimizes voltage rise under high di/dt transients, critical for fast-rising lightning surges.
Junction Capacitance	175pF at 22V, 1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces.

Pinout & Package

STF203-22.TCT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required - all six terminals are functional and must be connected for full 40A rating.

Pin/Terminal	Circuit Role	Design Meaning
Pins 1, 2, 3	GND	Common ground return path for surge current; all three must be soldered to PCB ground plane with multiple vias to minimize inductance.
Pins 4, 5, 6	IN	Protected line input (e.g., VBUS in USB Type-C); all three pins connect in parallel to same trace for lowest impedance path to device.

Key Features

Feature	Design Value
Constant-clamp architecture	Clamping voltage stays within 27.5–28V from 24A to 40A and –40°C to +125°C - eliminates thermal derating and simplifies worst-case margin analysis.
FET-based shunt topology	Replaces PN-junction TVS with surge-rated MOSFET, achieving 20mΩ R_DYN and <0.1Ω effective on-resistance - reduces overshoot vs. traditional TVS by >10V at 40A.
High-energy surge capability	Rated for 1120W peak pulse power (8/20μs) - supports repeated ±1kV/42Ω surges per IEC 61000-4-5 without parametric shift.
Low-leakage protection	600nA max reverse leakage at 22V - avoids loading of 22V rails in always-on IoT and industrial equipment.

Applications

USB Type-C Power Delivery Input Protection	Industrial Load Switch Front-End Protection
Use Scenario: Protecting 20–22V VBUS lines in USB Type-C receptacles against ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at connector, shunting surge energy to ground before it reaches USB PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents overvoltage damage to 22V-tolerant PD controllers where conventional TVS would exceed 35V at 125°C.	Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Primary EOS protection element upstream of the load switch, limiting voltage stress on internal FET gate oxide and drain-source junction. Use Value: 40A surge rating and stable clamping ensure the load switch survives repeated 1.2/50μs + 8/20μs combination wave surges without latch-up or parametric drift.
IoT Device Power Rail Protection	Storage Device 22V Bus Protection
Use Scenario: Securing 22V auxiliary power inputs in battery-backed smart sensors, edge gateways, and cellular IoT modules exposed to field ESD and induced transients. IC Role / Device Role / Timing Role: Solid-state transient suppressor replacing bulkier MOV/TVS stacks, enabling compact 1.6mm × 1.6mm footprint on space-constrained PCBs. Use Value: 175pF capacitance and ±30kV ESD rating allow direct placement on 22V supply without filtering compromise or reliability risk in unattended deployments.	Use Scenario: Protecting 22V power inputs of NVMe SSD enclosures, SAS expanders, and enterprise storage backplanes against system-level surges and connector hot-swap events. IC Role / Device Role / Timing Role: High-reliability EOS guard for storage controller power domains, ensuring uninterrupted operation during data-intensive workloads. Use Value: Stable 27.5–28V clamping prevents false resets or latch-up in 22V-tolerant PMICs and voltage supervisors during multi-kV surge events.

USB Type-C Power Delivery Input Protection

Industrial Load Switch Front-End Protection

Use Scenario: Protecting 20–22V VBUS lines in USB Type-C receptacles against ESD, lightning-induced surges, and hot-plug transients.

IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at connector, shunting surge energy to ground before it reaches USB PD controller or e-fuse.

Use Value: Maintains 27.5–28V clamping across temperature and current - prevents overvoltage damage to 22V-tolerant PD controllers where conventional TVS would exceed 35V at 125°C.

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

IC Role / Device Role / Timing Role: Primary EOS protection element upstream of the load switch, limiting voltage stress on internal FET gate oxide and drain-source junction.

Use Value: 40A surge rating and stable clamping ensure the load switch survives repeated 1.2/50μs + 8/20μs combination wave surges without latch-up or parametric drift.

IoT Device Power Rail Protection

Storage Device 22V Bus Protection

Use Scenario: Securing 22V auxiliary power inputs in battery-backed smart sensors, edge gateways, and cellular IoT modules exposed to field ESD and induced transients.

IC Role / Device Role / Timing Role: Solid-state transient suppressor replacing bulkier MOV/TVS stacks, enabling compact 1.6mm × 1.6mm footprint on space-constrained PCBs.

Use Value: 175pF capacitance and ±30kV ESD rating allow direct placement on 22V supply without filtering compromise or reliability risk in unattended deployments.

Use Scenario: Protecting 22V power inputs of NVMe SSD enclosures, SAS expanders, and enterprise storage backplanes against system-level surges and connector hot-swap events.

IC Role / Device Role / Timing Role: High-reliability EOS guard for storage controller power domains, ensuring uninterrupted operation during data-intensive workloads.

Use Value: Stable 27.5–28V clamping prevents false resets or latch-up in 22V-tolerant PMICs and voltage supervisors during multi-kV surge events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ22A	PN-junction TVS diode; 35.1V min breakdown, 37.1V max clamping at 23.3A (8/20μs); higher R_DYN, clamping rises with temperature and current.	Limited to lower-energy surges; requires derating above 85°C; unsuitable for 22V systems needing sub-30V clamping at full temperature range.	Choose SMAJ22A only if cost is primary constraint and clamping >35V at 40A is acceptable - not recommended for USB PD or industrial load switches.
TPD2S017DRBR	Integrated dual-channel TVS array; 22V working voltage, 30V clamping at 4A (8/20μs); rated for 4A only, not 40A.	Designed for low-capacitance data-line protection (e.g., USB 2.0 D+/D−); lacks power-rail surge capacity and thermal robustness.	Use TPD2S017DRBR for signal-line ESD only; STF203-22.TCT is required for 22V power rail surge handling - not interchangeable.

Compared with SMAJ22A and TPD2S017DRBR, STF203-22.TCT delivers uniquely stable 27.5–28V clamping across its full 40A/–40°C–+125°C operating envelope - making it the only option among the three qualified for 22V USB PD bus protection and industrial-grade load switch front-end hardening.

Availability

STF203-22.TCT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V IoT power rail designs requiring stable component supply with guaranteed long-term continuity.

Supply support for STF203-22.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 ICs for precision sensing, protection, and signal integrity.

The STF203-22.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in 12–36V power rail protection where stable clamping, high surge current, and temperature insensitivity are mandatory.

FAQ

What is the primary protection function of the STF203-22.TCT?

The STF203-22.TCT functions as a transient diverting suppressor that shunts high-energy electrical overstress (EOS) events - including ESD, lightning surges, and EFT - away from sensitive downstream components. It achieves this using a precision-triggered surge-rated FET, not a PN-junction diode, enabling stable 27.5–28V clamping at 40A and across –40°C to +125°C. This architecture makes STF203-22.TCT especially effective for protecting 22V USB PD buses and industrial load switch inputs.

Does the STF203-22.TCT require a thermal pad on the PCB?

No, the STF203-22.TCT does not require a thermal pad. Its DFN-6 package dissipates surge energy through the copper traces and ground vias connected to pins 1–3 (GND) and pins 4–6 (IN). The datasheet explicitly states "no thermal pad is needed" because energy is dissipated in the silicon during transient events, not continuously. Layout best practice emphasizes low-inductance grounding via multiple vias to the inner ground plane - not thermal mass under the package.

Can STF203-22.TCT be used on data lines like USB 2.0 or DisplayPort?

No, STF203-22.TCT is not suitable for high-speed data lines. With 175pF junction capacitance, it would severely degrade signal integrity on differential pairs operating above ~10Mbps. It is engineered exclusively for 22V power or low-speed I/O line protection - such as USB Type-C VBUS, load switch inputs, or 22V auxiliary rails. For data-line ESD protection, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF) alongside STF203-22.TCT in complete interface solutions.

How does STF203-22.TCT differ from standard TVS diodes in clamping behavior?

Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (V_C = V_BR + I_PP × R_DYN), STF203-22.TCT maintains near-constant clamping - 27.5–28V - from 24A to 40A and across its full temperature range. This results from its FET-based shunt architecture, where R_DS(on) decreases under surge, yielding ultra-low 20mΩ dynamic resistance. That stability prevents overvoltage failure in 22V systems where conventional TVS may exceed 35V at high temperature or current - a key differentiator for STF203-22.TCT.

Is STF203-22.TCT compliant with industry surge standards?

Yes, STF203-22.TCT is explicitly rated to meet IEC 61000-4-5 Level 4 (±1kV, 1.2/50μs voltage + 8/20μs current, R_S = 42Ω) and IEC 61000-4-2 Level 4 (±30kV contact/air) standards. Its 40A peak pulse current (8/20μs) and 1120W peak pulse power ratings are validated per these test methods. It also satisfies IEC 61000-4-4 (±4kV EFT) and is RoHS/WEEE compliant with UL 94V-0 molding compound - confirming suitability for industrial, computing, and consumer applications requiring certified surge immunity.

STF203-22.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

STF203-22.TCT FAQ

1.How can I place an order for STF203-22.TCT through Aetrix?

Please submit a Request for Quotation (RFQ) for STF203-22.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 STF203-22.TCT reliable?

The price and inventory of STF203-22.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF203-22.TCT is usually 5 days.

3.What payment methods are accepted for STF203-22.TCT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF203-22.TCT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STF203-22.TCT?

STF203-22.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STF203-22.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 STF203-22.TCT?

For technical support, including STF203-22.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF203-22.TCT requirements.

6.How does Aetrix verify that STF203-22.TCT is sourced from the original manufacturer or authorized distributors?

All STF203-22.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 STF203-22.TCT meets industry standards.

7.What is the process for return or replacement of STF203-22.TCT?

All STF203-22.TCT units undergo pre-shipment inspection (PSI). If there is an issue with STF203-22.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 STF203-22.TCT part is unused and in its original packaging.

Return procedure for STF203-22.TCT:

1.Submit a request within 90 days.

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

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