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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Supply Controllers, Monitors

Semtech Corporation TS4305ASTRT

Name: TS4305ASTRT
Brand: Semtech Corporation
SKU: TS4305ASTRT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS4305ASTRT

Manufacturer:: Semtech Corporation

Category:: Power Supply Controllers, Monitors

Package:: -

Datasheet:: TS4305ASTRT.pdf

Description:: SECONDARY-SIDE CONTR., 5V DRIVE,

Quantity:: RFQ Add To RFQ list

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Inventory:1,255

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Product details

Overview

TS4305ASTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and a stable 27.6–28V clamping voltage across full temperature range (−40°C to +125°C). It is deployed in USB Type-C PD input protection where precise voltage clamping prevents damage to downstream controllers.

For engineers reviewing the TS4305ASTRT datasheet, pinout, applications, or equivalent options, this device offers superior clamping stability versus conventional TVS diodes-critical for industrial equipment, IoT interfaces, and load switch input protection under varying thermal and surge conditions.

Technical Context

The TS4305ASTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike standard TVS diodes, its clamping voltage remains nearly constant (27.6–28V) from 24A to 40A peak pulse current due to the FET's decreasing R_DS(on) under surge stress.

It operates with a 22V reverse stand-off voltage (V_RWM) and 25–27.9V breakdown (V_BR), exhibits only 20mΩ dynamic resistance, and maintains low junction capacitance (175pF at 22V/1MHz)-enabling use on high-speed bus lines without signal integrity degradation.

Key Specifications

Parameter	Value and Actual Design Meaning
Working Voltage	22V - Matches nominal USB PD bus voltage and avoids false triggering during normal operation.
Clamping Voltage	27.6–28V at 40A (8/20μs) - Remains stable across temperature and current, protecting 24V-tolerant ICs like load switches and PD controllers.
ESD Rating	±30kV contact & air (IEC 61000-4-2) - Exceeds industrial and consumer ESD immunity requirements without derating.
Peak Pulse Current	40A (8/20μs) - Meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD ports.
Junction Capacitance	175pF at 22V/1MHz - Low enough to avoid signal distortion on 100Mbps+ power bus monitoring lines.
Dynamic Resistance	20mΩ - Enables minimal voltage rise under surge, critical for maintaining clamping accuracy at high dI/dt.

Pinout & Package

TS4305ASTRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with six terminals. The compact footprint enables placement directly at USB Type-C connectors or load switch inputs with minimal PCB area.

Pin/Terminal	Circuit Role	Design Meaning
Pins 1, 2, 3	GND	Common ground return path for surge current; all three must be connected to maximize current handling and minimize parasitic inductance.
Pins 4, 5, 6	IN	Protected line input (e.g., VBUS or power rail); parallel connection ensures uniform current sharing and optimal 40A surge capability.

Key Features

Feature	Design Value
FET-based transient shunt	Replaces traditional TVS diodes with active switching-clamping voltage stays flat across 24–40A and −40°C to +125°C.
Ultra-low dynamic resistance	20mΩ ensures <1V additional drop beyond trigger threshold, enabling tighter system-level voltage margin control.
High EFT immunity	±4kV per IEC 61000-4-4 (5/50ns) - protects against repetitive fast transients in motor-driven industrial environments.
Low leakage current	≤600nA at 22V - eliminates measurable power loss in always-on battery-powered IoT nodes.

Applications

USB Type-C Power Delivery Protection	Industrial Load Switch Input Protection
Use Scenario: Protecting the VBUS line of a USB Type-C port supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Transient Diverting Suppressor placed between connector and PD controller/load switch to clamp surges before they reach sensitive silicon. Use Value: Maintains 27.6V clamping at 40A and 125°C-well below the 30V absolute maximum rating of common PD controllers-ensuring robustness across thermal extremes.	Use Scenario: Securing the input of an industrial-grade load switch (e.g., HS2950P) exposed to lightning-induced surges on remote metering or robotics power rails. IC Role / Device Role / Timing Role: Primary EOS protection element diverting surge energy to ground before it stresses the load switch's internal FET. Use Value: Prevents gate oxide damage and latch-up by limiting voltage across the switch's VIN-to-GND terminals to ≤28V during 1.2/50μs ±1kV transients.
IoT Edge Node Power Bus Protection	Notebook/Tablet DC Input Protection
Use Scenario: Safeguarding 22V-rated power management ICs in battery-backed smart sensors deployed in uncontrolled environments. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input rail, coordinated with low-capacitance TVS on data lines. Use Value: Delivers ±30kV ESD immunity and 40A surge handling while consuming only 600nA leakage-extending battery life in always-on edge devices.	Use Scenario: Protecting the 20V DC input stage of ultraportable notebooks and tablets against accidental adapter misconnection or ESD events at the barrel jack or USB-C port. IC Role / Device Role / Timing Role: Front-end transient suppressor ensuring downstream PMICs and battery chargers operate within safe voltage limits. Use Value: Stable clamping enables reliable operation even at elevated ambient temperatures (>85°C) inside thin-form-factor enclosures where thermal derating degrades TVS performance.

USB Type-C Power Delivery Protection

Industrial Load Switch Input Protection

Use Scenario: Protecting the VBUS line of a USB Type-C port supporting up to 20V/5A PD negotiation.

IC Role / Device Role / Timing Role: Transient Diverting Suppressor placed between connector and PD controller/load switch to clamp surges before they reach sensitive silicon.

Use Value: Maintains 27.6V clamping at 40A and 125°C-well below the 30V absolute maximum rating of common PD controllers-ensuring robustness across thermal extremes.

Use Scenario: Securing the input of an industrial-grade load switch (e.g., HS2950P) exposed to lightning-induced surges on remote metering or robotics power rails.

IC Role / Device Role / Timing Role: Primary EOS protection element diverting surge energy to ground before it stresses the load switch's internal FET.

Use Value: Prevents gate oxide damage and latch-up by limiting voltage across the switch's VIN-to-GND terminals to ≤28V during 1.2/50μs ±1kV transients.

IoT Edge Node Power Bus Protection

Notebook/Tablet DC Input Protection

Use Scenario: Safeguarding 22V-rated power management ICs in battery-backed smart sensors deployed in uncontrolled environments.

IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input rail, coordinated with low-capacitance TVS on data lines.

Use Value: Delivers ±30kV ESD immunity and 40A surge handling while consuming only 600nA leakage-extending battery life in always-on edge devices.

Use Scenario: Protecting the 20V DC input stage of ultraportable notebooks and tablets against accidental adapter misconnection or ESD events at the barrel jack or USB-C port.

IC Role / Device Role / Timing Role: Front-end transient suppressor ensuring downstream PMICs and battery chargers operate within safe voltage limits.

Use Value: Stable clamping enables reliable operation even at elevated ambient temperatures (>85°C) inside thin-form-factor enclosures where thermal derating degrades TVS performance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ22A	Standard unidirectional TVS diode; 33.2V clamping at 24.7A (8/20μs); higher dynamic resistance (~0.5Ω); clamping rises with temperature and current.	Limited to lower-energy surges; requires larger voltage margin for same protection level; unsuitable for high-temp industrial use.	Choose SMAJ22A only for cost-sensitive, non-temperature-critical applications where 33V clamping is acceptable.
TPD2E007DRYR	Low-capacitance (3.5pF) dual-channel ESD protector; rated for ±12kV contact ESD only; no surge rating; 22V working voltage.	Designed for high-speed data lines (e.g., USB 2.0 D+/D−), not power rails; cannot handle 40A surges or IEC 61000-4-5 waveforms.	Use TPD2E007DRYR for signal-line ESD only; pair with TS4305ASTRT for complete USB-C solution (power + data).

Compared with SMAJ22A and TPD2E007DRYR, TS4305ASTRT uniquely combines 40A surge capability, temperature-stable clamping, and 22V operating voltage in a 1.6mm × 1.6mm DFN-making it the only viable single-device solution for high-reliability 22V power rail protection in thermally demanding applications.

Availability

TS4305ASTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.

Supply support for TS4305ASTRT 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 analog and mixed-signal ICs for precision sensing, protection, and connectivity.

The TS4305ASTRT belongs to Semtech's Transient Diverting Suppressor (TDS) family-engineered to replace conventional TVS diodes with active FET-based clamping for superior surge immunity in high-voltage, high-reliability power interfaces.

FAQ

What is the clamping voltage behavior of TS4305ASTRT under varying surge currents?

The TS4305ASTRT maintains a highly stable clamping voltage of 27.6–28V across its full rated peak pulse current range (24A to 40A, 8/20μs), thanks to its FET-based architecture and sub-20mΩ dynamic resistance. Unlike TVS diodes whose clamping rises linearly with current, TS4305ASTRT's clamping remains flat due to decreasing R_DS(on) under surge stress-verified in datasheet Figure 3 and Table 2.

Can TS4305ASTRT be used on USB Type-C CC or SBU lines?

No-TS4305ASTRT is optimized for power-line protection (e.g., VBUS) and is not suitable for CC or SBU lines. Its 175pF junction capacitance would distort the 300kHz CC signaling, and its 22V working voltage exceeds the 5.5V max on those lines. For CC/SBU, Semtech recommends uClamp2411ZA-a 24V, low-capacitance ESD protector specifically designed for those signals.

How does TS4305ASTRT compare to standard TVS diodes in high-temperature operation?

At 125°C, TS4305ASTRT clamps at ~27.6V-identical to its value at 25°C-while typical 22V TVS diodes (e.g., SMAJ22A) exhibit >38V clamping at the same temperature and current due to positive temperature coefficient of V_BR and fixed dynamic resistance. This stability makes TS4305ASTRT essential for automotive-adjacent or enclosed industrial designs.

What is the recommended PCB layout for TS4305ASTRT to achieve full 40A surge rating?

To achieve the full 40A (8/20μs) rating, all three GND pins (1, 2, 3) and all three IN pins (4, 5, 6) must be connected in parallel using short, wide traces. Place TS4305ASTRT within 5mm of the protected connector, use ≥4 vias per GND pad to the ground plane, and avoid thermal relief on GND pads-per Semtech's layout guidelines in datasheet Figure 7.

Is TS4305ASTRT compliant with RoHS, REACH, and halogen-free standards?

Yes-TS4305ASTRT is Pb-free, halogen-free, and fully compliant with RoHS Directive 2011/65/EU and WEEE Directive 2012/19/EU. Its molding compound meets UL 94V-0 flammability rating, and lead finish is 100% matte tin, as confirmed in the "Mechanical Characteristics" section of the official Semtech datasheet Rev 2.5.

TS4305ASTRT Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: *

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Applications:: -

Voltage - Input:: -

Voltage - Supply:: -

Current - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

TS4305ASTRT FAQ

1.How can I place an order for TS4305ASTRT through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4305ASTRT 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 TS4305ASTRT reliable?

The price and inventory of TS4305ASTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4305ASTRT is usually 5 days.

3.What payment methods are accepted for TS4305ASTRT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4305ASTRT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4305ASTRT?

TS4305ASTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4305ASTRT 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 TS4305ASTRT?

For technical support, including TS4305ASTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4305ASTRT requirements.

6.How does Aetrix verify that TS4305ASTRT is sourced from the original manufacturer or authorized distributors?

All TS4305ASTRT 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 TS4305ASTRT meets industry standards.

7.What is the process for return or replacement of TS4305ASTRT?

All TS4305ASTRT units undergo pre-shipment inspection (PSI). If there is an issue with TS4305ASTRT, 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 TS4305ASTRT part is unused and in its original packaging.

Return procedure for TS4305ASTRT:

1.Submit a request within 90 days.

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

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