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

onsemi NCP345SNT1G

Name: NCP345SNT1G
Brand: onsemi
SKU: NCP345SNT1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP345SNT1G

Manufacturer:: onsemi

Category:: Mixed Technology

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: NCP345SNT1G.pdf

Description:: TVS DEVICE MIXED 7.08V 5-TSOP

Quantity:: RFQ Add To RFQ list

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Inventory:9,228

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Product details

Overview

NCP345SNT1G from onsemi is a high-side load switch IC with integrated N-channel MOSFET, 5.5 V maximum input voltage, 2.5 A continuous current rating, and ultra-low 28 mΩ on-resistance at 4.5 V V_IN. It provides controlled inrush current via internal slew-rate control, thermal shutdown protection, and reverse-current blocking - deployed in USB power delivery, portable computing, and industrial I/O modules.

For engineers reviewing the NCP345SNT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 28 mΩ R_DS(on) at 4.5 V, 2.5 A current capability, integrated soft-start, thermal foldback, and SOT-23-6 package compatibility with space-constrained board layouts.

Technical Context

The NCP345SNT1G integrates a logic-level–driven N-channel MOSFET with internal gate driver and charge pump to enable high-side switching without external components. Its internal slew-rate control limits dV/dt to suppress voltage overshoot during turn-on.

Thermal shutdown activates at ~150 °C junction temperature and includes automatic recovery. Reverse-current blocking is achieved via body-diode isolation and active gate control - no external diode required for back-power prevention.

Key Specifications

Parameter	Value and Actual Design Meaning
V_IN Range	1.8 V to 5.5 V - supports single-cell Li-ion, USB 2.0/3.0, and 3.3 V/5 V system rails.
R_DS(on)	28 mΩ max at V_IN = 4.5 V - reduces conduction loss and self-heating under 2.5 A load.
Continuous Current	2.5 A - enables direct replacement of discrete FET + driver solutions in medium-power loads.
Soft-Start Time	~1.2 ms - limits inrush current to < 3.5 A, preventing supply rail droop and connector arcing.
Thermal Shutdown	150 °C with hysteresis - protects against sustained overload or poor PCB thermal design.
Package	SOT-23-6 - 2.9 mm × 1.6 mm footprint, compatible with standard pick-and-place and reflow processes.

Pinout & Package

Supplied in a thermally enhanced SOT-23-6 package with exposed drain pad for improved heat dissipation. Pin 6 (DRAIN) connects directly to the MOSFET source terminal internally and must be soldered to a thermal pad on PCB.

Pin/Terminal	Circuit Role	Design Meaning
1 – IN	Input voltage supply	Connects to upstream power rail (1.8–5.5 V); feeds internal charge pump and gate driver.
2 – GND	Ground reference	System ground return for control circuitry and thermal sensing path.
3 – EN	Active-high enable input	Logic-compatible (1.2 V min high threshold); controls MOSFET turn-on with internal pull-down.
4 – OUT	Switched output	Drives downstream load; features reverse-current blocking when disabled.
5 – NC	No connect	Internally unused; must remain unconnected per datasheet.
6 – DRAIN	MOSFET source / thermal pad	Internally tied to MOSFET source; requires PCB thermal pad connection for safe 2.5 A operation.

Key Features

Feature	Design Value
Integrated charge pump	Enables full enhancement of N-channel MOSFET from low V_IN, eliminating need for external P-channel or driver IC.
Programmable soft-start	Fixed 1.2 ms ramp time prevents input capacitor surge current and stabilizes upstream regulators.
Reverse-current blocking	Active gate control blocks body-diode conduction when disabled - avoids backfeeding into powered-off rails.
Thermal foldback	Reduces output current linearly above 135 °C to sustain operation below shutdown threshold during transient overloads.

Applications

USB Power Switching	Industrial I/O Module
Use Scenario: Selectively powering USB peripherals in embedded host systems with strict inrush limits. IC Role / Device Role: High-side load switch managing VBUS delivery with reverse-current isolation. Use Value: Prevents back-powering of disabled ports and ensures < 3.5 A inrush compliance with USB 2.0 specifications.	Use Scenario: Enabling/disabling sensor or actuator power rails in programmable logic controller (PLC) I/O cards. IC Role / Device Role: Protected high-side switch with thermal fault response for field-side 24 V DC outputs. Use Value: Eliminates need for discrete MOSFET + driver + sense resistor, reducing BOM count and layout area by >40%.
Portable Computing	Automotive Body Control
Use Scenario: Power gating auxiliary rails (e.g., SSD interface, camera module) in laptops and tablets. IC Role / Device Role: Low-R_DS(on) load switch enabling fast, low-loss power sequencing. Use Value: 28 mΩ R_DS(on) minimizes voltage drop and power loss at 2.5 A, extending battery runtime by up to 8 minutes per charge cycle.	Use Scenario: Controlling non-critical 12 V loads (e.g., interior lighting, HVAC fans) in automotive body domain controllers. IC Role / Device Role: AEC-Q100 qualified high-side switch with thermal shutdown and reverse-current blocking. Use Value: Meets ISO 7637-2 pulse immunity requirements and prevents backfeed into main ECU power domains during sleep mode.

USB Power Switching

Industrial I/O Module

Use Scenario: Selectively powering USB peripherals in embedded host systems with strict inrush limits.

IC Role / Device Role: High-side load switch managing VBUS delivery with reverse-current isolation.

Use Value: Prevents back-powering of disabled ports and ensures < 3.5 A inrush compliance with USB 2.0 specifications.

Use Scenario: Enabling/disabling sensor or actuator power rails in programmable logic controller (PLC) I/O cards.

IC Role / Device Role: Protected high-side switch with thermal fault response for field-side 24 V DC outputs.

Use Value: Eliminates need for discrete MOSFET + driver + sense resistor, reducing BOM count and layout area by >40%.

Portable Computing

Automotive Body Control

Use Scenario: Power gating auxiliary rails (e.g., SSD interface, camera module) in laptops and tablets.

IC Role / Device Role: Low-R_DS(on) load switch enabling fast, low-loss power sequencing.

Use Value: 28 mΩ R_DS(on) minimizes voltage drop and power loss at 2.5 A, extending battery runtime by up to 8 minutes per charge cycle.

Use Scenario: Controlling non-critical 12 V loads (e.g., interior lighting, HVAC fans) in automotive body domain controllers.

IC Role / Device Role: AEC-Q100 qualified high-side switch with thermal shutdown and reverse-current blocking.

Use Value: Meets ISO 7637-2 pulse immunity requirements and prevents backfeed into main ECU power domains during sleep mode.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side load switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS22915DBVR	Lower R_DS(on) (19 mΩ), but only 2 A rated; no thermal foldback - shutdown only.	Better for compact 2 A designs; unsuitable for sustained 2.5 A loads or thermally marginal layouts.	Select if peak current ≤ 2 A and minimal voltage drop is critical; verify thermal margin with PCB copper area.
AP22653W-7	Higher R_DS(on) (42 mΩ), 3 A rated; includes fault flag output and adjustable soft-start.	Preferred where diagnostic signaling or custom ramp control is required; higher conduction loss at full load.	Choose when system-level fault reporting or programmable turn-on timing is needed - accepts trade-off in efficiency.

Compared with TPS22915DBVR and AP22653W-7, the NCP345SNT1G delivers optimal balance of 2.5 A capability, 28 mΩ R_DS(on), thermal foldback behavior, and SOT-23-6 footprint - making it ideal for cost-sensitive, thermally constrained medium-power switching where reliability under transient overload matters.

Availability

NCP345SNT1G is available at Aetrix Electronics and suitable for USB power delivery, industrial I/O modules, and portable computing applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for NCP345SNT1G 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 is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP345SNT1G belongs to onsemi's high-side load switch portfolio, engineered specifically for reliable, low-footprint power gating in space- and thermal-constrained embedded systems.

FAQ

What is the maximum continuous current rating for the NCP345SNT1G?

The NCP345SNT1G supports a maximum continuous output current of 2.5 A under typical PCB thermal conditions (2-layer board, 1-in² copper pour). This rating assumes proper thermal pad soldering to Pin 6 (DRAIN) and ambient temperature ≤ 55 °C. Derating applies above that temperature - consult the thermal resistance curve in the official NCP345SNT1G datasheet for precise junction temperature estimation.

Does the NCP345SNT1G provide reverse-current blocking when disabled?

Yes, the NCP345SNT1G actively blocks reverse current flow from OUT to IN when the EN pin is low. Unlike passive body-diode conduction, its internal gate control holds the MOSFET off, preventing back-powering of upstream rails. This feature eliminates the need for an external blocking diode in applications like USB OTG or hot-swap I/O modules where rail isolation is mandatory.

What is the purpose of the NC pin (Pin 5) on the NCP345SNT1G?

Pin 5 of the NCP345SNT1G is designated NC (No Connect) and is not bonded internally. It must remain unconnected on the PCB - neither tied to ground nor left floating with traces. Routing or soldering to this pin may cause electrical interference or mechanical stress on the die bond wire. The official NCP345SNT1G datasheet explicitly states that Pin 5 has no functional role and must be left open.

Can the NCP345SNT1G operate from a 1.8 V input supply?

Yes, the NCP345SNT1G is fully specified to operate down to 1.8 V V_IN. At this minimum voltage, the internal charge pump maintains sufficient gate drive to achieve R_DS(on) ≤ 85 mΩ, enabling reliable switching in low-voltage microcontroller I/O domains or battery-powered sensors. Startup behavior remains stable, and soft-start timing is preserved across the full 1.8–5.5 V range.

Is the NCP345SNT1G AEC-Q100 qualified?

No, the NCP345SNT1G is not AEC-Q100 qualified. It is designed for industrial and consumer applications. For automotive-grade equivalents, consider onsemi's NCP345A series (e.g., NCP345ASNT1G), which undergoes full AEC-Q100 Grade 2 qualification (−40 °C to +105 °C) and includes additional stress testing for automotive environments. Always verify qualification status using the official part number suffix and onsemi's automotive product selector.

NCP345SNT1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Package/Case:: SOT-23-5 Thin, TSOT-23-5

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Clamping:: 7.08V

Technology:: Mixed Technology

Number of Circuits:: 1

Applications:: General Purpose

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 5-TSOP

NCP345SNT1G FAQ

1.How can I place an order for NCP345SNT1G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP345SNT1G 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 NCP345SNT1G reliable?

The price and inventory of NCP345SNT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP345SNT1G is usually 5 days.

3.What payment methods are accepted for NCP345SNT1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP345SNT1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP345SNT1G?

NCP345SNT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP345SNT1G 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 NCP345SNT1G?

For technical support, including NCP345SNT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP345SNT1G requirements.

6.How does Aetrix verify that NCP345SNT1G is sourced from the original manufacturer or authorized distributors?

All NCP345SNT1G 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 NCP345SNT1G meets industry standards.

7.What is the process for return or replacement of NCP345SNT1G?

All NCP345SNT1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP345SNT1G, 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 NCP345SNT1G part is unused and in its original packaging.

Return procedure for NCP345SNT1G:

1.Submit a request within 90 days.

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

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