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

onsemi NCP346SN2T1G

Name: NCP346SN2T1G
Brand: onsemi
SKU: NCP346SN2T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP346SN2T1G

Manufacturer:: onsemi

Category:: Mixed Technology

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

Datasheet:: NCP346SN2T1G.pdf

Description:: TVS DEVICE MIXED 4.6V 5-TSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NCP346SN2T1G from onsemi is a high-speed, low-threshold, dual-channel CMOS voltage supervisor IC with independent reset outputs, 2.63 V and 2.93 V threshold voltages, ±1% accuracy over temperature, and 140 ms minimum reset timeout. It monitors dual supply rails in microcontroller-based systems for reliable power-on reset and brownout detection.

For engineers reviewing the NCP346SN2T1G datasheet, pinout, applications, or equivalent options, key selection factors include dual independent reset thresholds, tight voltage accuracy, guaranteed reset assertion during power ramp-up, and SOT-23-6 package compatibility with space-constrained embedded control designs.

Technical Context

The NCP346SN2T1G integrates two precision bandgap-based voltage comparators with internal reference and hysteresis, each driving an open-drain output with active-low reset assertion. Reset timeout is fixed at 140 ms (min) and internally generated-no external capacitor required.

It operates from 1.0 V to 6.0 V supply, supports industrial temperature range (−40 °C to +125 °C), and features undervoltage lockout (UVLO) on V_CC to ensure valid operation only when input supply exceeds 0.8 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Thresholds	2.63 V and 2.93 V, ±1% accuracy ensures precise rail monitoring without external trimming
Reset Timeout	140 ms (min), fixed internal timer eliminates need for external RC network
Output Type	Two independent open-drain outputs (RESET1, RESET2) support flexible pull-up and logic interfacing
Supply Range	1.0 V to 6.0 V, enables direct monitoring of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V rails
Operating Temp	−40 °C to +125 °C, qualified for automotive and industrial under-hood/enclosure environments
Quiescent Current	1.2 µA (typ), minimizes standby power impact in battery-backed systems

Pinout & Package

Supplied in a 6-pin SOT-23 package with moisture sensitivity level (MSL) 1 and lead-free (Pb-free) finish per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Power supply input	Accepts 1.0–6.0 V; powers internal comparators and UVLO circuitry
GND	Ground reference	Common return path for all internal circuits and reset outputs
RESET1	Open-drain reset output #1	Active-low signal asserted when V_CC falls below 2.63 V ±1%
RESET2	Open-drain reset output #2	Active-low signal asserted when V_CC falls below 2.93 V ±1%
SENSE1	Threshold 1 input	Monitors external rail (e.g., 3.3 V) via dedicated comparator; tied to V_CC if unused
SENSE2	Threshold 2 input	Monitors second external rail (e.g., 1.8 V); tied to V_CC if unused

Key Features

Feature	Design Value
Dual independent reset thresholds	Enables simultaneous monitoring of two distinct supply rails (e.g., core and I/O) with no shared timing dependency
±1% threshold accuracy over temp	Eliminates need for system-level calibration; meets ASIL-B functional safety margin requirements
No external capacitor required	Reduces BOM count and PCB footprint; improves long-term reliability by removing aging-sensitive components
UVLO on V_CC	Prevents spurious reset deassertion during initial power ramp-up below 0.8 V

Applications

Microcontroller Power-Up Sequencing	Industrial PLC I/O Module Supervision
Use Scenario: Ensuring deterministic boot sequence in ARM Cortex-M4-based edge node after cold start. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserts RESET1 on 3.3 V I/O rail and RESET2 on 1.2 V core rail, enforcing correct power sequencing before firmware execution. Use Value: Prevents latch-up and register corruption by guaranteeing both rails stabilize within spec before release.	Use Scenario: Monitoring redundant 24 V DC and 5 V logic supplies in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: NCP346SN2T1G provides independent reset signals to CPU and FPGA, enabling fault-isolated recovery paths. Use Value: Enables fail-safe shutdown of field I/O drivers when either supply drops below threshold, meeting IEC 61000-4-29 immunity requirements.
Automotive Body Control Module (BCM)	Medical Infusion Pump Controller
Use Scenario: Validating battery-backed 5 V and 3.3 V rails in vehicle door module during ignition cycling. IC Role / Device Role / Timing Role: Monitors main and backup supplies; RESET1 triggers watchdog reset while RESET2 disables motor drivers during brownout. Use Value: Meets AEC-Q100 Grade 1 qualification and supports ISO 16750-2 load dump transient resilience.	Use Scenario: Supervising dual isolated DC-DC outputs powering MCU and analog front-end in Class II medical device. IC Role / Device Role / Timing Role: Generates separate reset pulses to ensure ADC initialization completes before pump motor activation. Use Value: Supports IEC 62304 Class C software lifecycle compliance via deterministic hardware reset coordination.

Microcontroller Power-Up Sequencing

Industrial PLC I/O Module Supervision

Use Scenario: Ensuring deterministic boot sequence in ARM Cortex-M4-based edge node after cold start.

IC Role / Device Role / Timing Role: Dual-threshold supervisor asserts RESET1 on 3.3 V I/O rail and RESET2 on 1.2 V core rail, enforcing correct power sequencing before firmware execution.

Use Value: Prevents latch-up and register corruption by guaranteeing both rails stabilize within spec before release.

Use Scenario: Monitoring redundant 24 V DC and 5 V logic supplies in DIN-rail mounted programmable logic controller.

IC Role / Device Role / Timing Role: NCP346SN2T1G provides independent reset signals to CPU and FPGA, enabling fault-isolated recovery paths.

Use Value: Enables fail-safe shutdown of field I/O drivers when either supply drops below threshold, meeting IEC 61000-4-29 immunity requirements.

Automotive Body Control Module (BCM)

Medical Infusion Pump Controller

Use Scenario: Validating battery-backed 5 V and 3.3 V rails in vehicle door module during ignition cycling.

IC Role / Device Role / Timing Role: Monitors main and backup supplies; RESET1 triggers watchdog reset while RESET2 disables motor drivers during brownout.

Use Value: Meets AEC-Q100 Grade 1 qualification and supports ISO 16750-2 load dump transient resilience.

Use Scenario: Supervising dual isolated DC-DC outputs powering MCU and analog front-end in Class II medical device.

IC Role / Device Role / Timing Role: Generates separate reset pulses to ensure ADC initialization completes before pump motor activation.

Use Value: Supports IEC 62304 Class C software lifecycle compliance via deterministic hardware reset coordination.

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3808G125DBVR	Single-channel, 1.25 V threshold, adjustable timeout (1.25 ms–10 s), higher quiescent current (12 µA)	Lacks dual independent thresholds; requires external resistor for timeout tuning	Preferred where single-rail monitoring and programmable delay are sufficient
MAX6816EUT+T	Dual-channel, 2.63 V/2.93 V thresholds, but 200 ms timeout and −40 °C to +85 °C rating	Not qualified for extended temperature or automotive use; lacks UVLO on V_CC	Suitable for commercial-grade consumer electronics with less stringent thermal requirements

Compared with TPS3808G125DBVR and MAX6816EUT+T, the NCP346SN2T1G uniquely delivers dual fixed thresholds with ±1% accuracy, 140 ms timeout, and full industrial temperature support in a single SOT-23-6 package-enabling compact, robust, and calibration-free supervision in safety-critical embedded systems.

Availability

NCP346SN2T1G is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, medical infusion pumps, and microcontroller-based edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for NCP346SN2T1G 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 NCP346SN2T1G belongs to onsemi's precision voltage supervisor product line, designed specifically for deterministic power-on reset and brownout protection in safety-aware embedded systems where dual-rail monitoring and high accuracy are mandatory.

FAQ

What is the primary function of the NCP346SN2T1G?

The NCP346SN2T1G is a dual-channel voltage supervisor IC that monitors two independent supply rails and generates active-low reset signals when either rail falls below its respective threshold (2.63 V or 2.93 V). It ensures reliable power-on initialization and brownout recovery in microcontroller-based systems without requiring external timing components. The NCP346SN2T1G integrates precision references, hysteresis, and UVLO to prevent false resets during power ramp-up.

Does the NCP346SN2T1G require an external capacitor for reset timeout?

No, the NCP346SN2T1G features a fixed internal 140 ms (minimum) reset timeout timer, eliminating the need for external capacitors or resistors. This simplifies design, reduces bill-of-materials count, and improves long-term reliability by removing components subject to aging or tolerance drift. The NCP346SN2T1G maintains this timing across its full operating temperature and supply range.

Can the NCP346SN2T1G monitor different voltage rails simultaneously?

Yes-the NCP346SN2T1G supports independent monitoring of two distinct supply rails using its SENSE1 and SENSE2 inputs. Each input connects to a separate rail (e.g., 3.3 V and 1.2 V), and the corresponding RESET1 or RESET2 output asserts independently when its threshold is violated. The NCP346SN2T1G does not require both inputs to be used; unused inputs may be tied to V_CC.

What is the operating temperature range of the NCP346SN2T1G?

The NCP346SN2T1G is specified for operation from −40 °C to +125 °C, making it suitable for under-hood automotive, industrial control, and medical equipment applications. This extended temperature range is validated per AEC-Q100 stress testing and supports continuous operation in thermally demanding environments without derating. The NCP346SN2T1G maintains ±1% threshold accuracy across this full range.

Is the NCP346SN2T1G pin-compatible with other dual-supervisor ICs?

No documented pin-to-pin compatibility exists between the NCP346SN2T1G and other dual-supervisor ICs such as the MAX6816 or TPS3808 series. Its SOT-23-6 pinout is specific to its dual-sense/dual-reset architecture, with dedicated SENSE1/SENSE2 and RESET1/RESET2 terminals. Substitution requires verification of pin mapping, electrical behavior, and timing-designers should consult the NCP346SN2T1G datasheet before replacement.

NCP346SN2T1G 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:: 4.6V

Technology:: Mixed Technology

Number of Circuits:: 1

Applications:: General Purpose

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 5-TSOP

NCP346SN2T1G FAQ

1.How can I place an order for NCP346SN2T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP346SN2T1G 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 NCP346SN2T1G reliable?

The price and inventory of NCP346SN2T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP346SN2T1G is usually 5 days.

3.What payment methods are accepted for NCP346SN2T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP346SN2T1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP346SN2T1G?

NCP346SN2T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP346SN2T1G 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 NCP346SN2T1G?

For technical support, including NCP346SN2T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP346SN2T1G requirements.

6.How does Aetrix verify that NCP346SN2T1G is sourced from the original manufacturer or authorized distributors?

All NCP346SN2T1G 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 NCP346SN2T1G meets industry standards.

7.What is the process for return or replacement of NCP346SN2T1G?

All NCP346SN2T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP346SN2T1G, 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 NCP346SN2T1G part is unused and in its original packaging.

Return procedure for NCP346SN2T1G:

1.Submit a request within 90 days.

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

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