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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi NCP694DSAN25T1G

Name: NCP694DSAN25T1G
Brand: onsemi
SKU: NCP694DSAN25T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP694DSAN25T1G

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 6-VQFN Exposed Pad

Datasheet:: NCP694DSAN25T1G.pdf

Description:: IC REG LINEAR 2.5V 1A 6HSON

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Product details

Overview

NCP694DSAN25T1G from onsemi is a 2.5 V fixed-output, 1 A CMOS low-dropout linear voltage regulator in HSON-6 package, featuring ultra-low standby current (≤1.0 µA), −3 mV load regulation at 1 A, and integrated auto-discharge function for rapid output discharge during shutdown. It serves as a precision power supply for battery-powered portable electronics requiring stable low-voltage rails.

For engineers reviewing the NCP694DSAN25T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1 A (0.32 V), thermal shutdown (150°C), enable threshold (0.4 V logic low), PSRR (70 dB @ 1 kHz), and compatibility with ceramic output capacitors ≥4.7 µF.

Technical Context

The NCP694DSAN25T1G uses a PMOS pass transistor architecture enabling ultra-low dropout and fast transient response. Its internal circuit includes a precision 1.0 V reference, error amplifier, current-limit protection (250 mA short-circuit), and thermal shutdown with 30°C hysteresis.

This D-version device integrates an auto-discharge transistor activated during CE-driven standby mode, ensuring rapid V_OUT discharge to prevent system latch-up or residual bias in portable applications. The HSON-6 package provides dual V_OUT pins (pins 1 & 2) for enhanced current handling and reduced PCB trace resistance.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5 V ±3% (0.075 V tolerance), stable over −40°C to +85°C ambient
Max Output Current	1 A continuous - supports high-current microcontrollers and RF modules without external heatsinking
Dropout Voltage	0.32 V at 1 A - enables operation from 2.82 V input, critical for single-cell Li-ion or Li-poly systems
Load Regulation	−3 mV from 1 mA to 1 A - ensures <±0.12% output deviation under full dynamic load swing
PSRR	70 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input
Standby Current	≤1.0 µA at V_IN = 6.0 V - extends battery life in deep-sleep modes of IoT sensors and wearables
Enable Threshold	V_TH,LOW ≤ 0.4 V - compatible with 1.8 V/3.3 V GPIOs for reliable logic-controlled shutdown

Pinout & Package

HSON-6 package (Case 506AE): 2.9 mm × 3.0 mm × 0.9 mm body, exposed thermal pad, Pb-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1	V_OUT	Main regulated output terminal - paralleled with Pin 2 to share 1 A load current and reduce IR drop
2	V_OUT	Secondary regulated output terminal - mandatory connection for full 1 A capability and thermal derating compliance
3	ADJ / NC	No connection for fixed-output NCP694DSAN25T1G - left floating or grounded per layout best practice
4	GND	Power ground reference - must connect directly to exposed thermal pad for optimal junction temperature control
5	CE	Active-high enable input - pulled low disables regulator and activates auto-discharge; tied to V_IN if unused
6	V_IN	Input supply (1.4–6.0 V) - requires local 4.7 µF ceramic decoupling within 2 mm of pin

Key Features

Feature	Design Value
Auto-discharge function	Integrated NMOS switch discharges V_OUT to GND in <100 µs upon CE deactivation - prevents back-powering of upstream circuits
Ultra-low dropout	0.10 V dropout at 300 mA and 0.32 V at 1 A for 2.5 V output - maximizes usable battery voltage range
Thermal protection	150°C junction shutdown with 30°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design
High PSRR	70 dB @ 1 kHz and >50 dB up to 100 kHz - maintains clean 2.5 V rail for analog sensors and ADC references
Ceramic capacitor compatible	Stable with ≥4.7 µF X5R/X7R MLCCs - eliminates need for bulky tantalum, reduces board area and cost

Applications

Portable Medical Sensors	Wearable Fitness Trackers
Use Scenario: Continuous glucose monitor (CGM) using low-power Bluetooth LE SoC and analog front-end ICs. IC Role / Device Role / Timing Role: Primary 2.5 V supply for op-amps, ADCs, and BLE radio transceivers during active sensing and transmission cycles. Use Value: Ultra-low standby current (<1 µA) extends coin-cell battery life beyond 6 months; 0.32 V dropout enables operation down to 2.82 V, capturing >95% of Li-MnO₂ cell capacity.	Use Scenario: Optical heart-rate sensor module with photodiode array, LED drivers, and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Stable 2.5 V bias for precision current sources and analog signal chain, synchronized to MCU sleep/wake states via CE pin. Use Value: Auto-discharge ensures rapid V_OUT collapse when MCU enters deep sleep, eliminating leakage paths that degrade sleep current below 5 µA.
Industrial Handheld Scanners	Smart Home Doorbell Cameras
Use Scenario: Rugged barcode scanner powered by 3.7 V Li-ion battery, operating across −20°C to +60°C ambient. IC Role / Device Role / Timing Role: Regulated 2.5 V rail for image sensor interface, laser driver control logic, and USB PHY. Use Value: −3 mV load regulation ensures consistent exposure timing and pixel gain calibration across full 1 A pulsed laser current load.	Use Scenario: Battery-powered video doorbell with motion-triggered wake-up, Wi-Fi SoC, and IR LEDs. IC Role / Device Role / Timing Role: Always-on 2.5 V supply for PIR sensor, wake-up controller, and RTC - enabled only during motion detection window. Use Value: CE-controlled standby reduces quiescent draw to ≤1 µA between motion events, enabling >1-year battery life on two AA cells.

Portable Medical Sensors

Wearable Fitness Trackers

Use Scenario: Continuous glucose monitor (CGM) using low-power Bluetooth LE SoC and analog front-end ICs.

IC Role / Device Role / Timing Role: Primary 2.5 V supply for op-amps, ADCs, and BLE radio transceivers during active sensing and transmission cycles.

Use Value: Ultra-low standby current (<1 µA) extends coin-cell battery life beyond 6 months; 0.32 V dropout enables operation down to 2.82 V, capturing >95% of Li-MnO₂ cell capacity.

Use Scenario: Optical heart-rate sensor module with photodiode array, LED drivers, and ARM Cortex-M0+ MCU.

IC Role / Device Role / Timing Role: Stable 2.5 V bias for precision current sources and analog signal chain, synchronized to MCU sleep/wake states via CE pin.

Use Value: Auto-discharge ensures rapid V_OUT collapse when MCU enters deep sleep, eliminating leakage paths that degrade sleep current below 5 µA.

Industrial Handheld Scanners

Smart Home Doorbell Cameras

Use Scenario: Rugged barcode scanner powered by 3.7 V Li-ion battery, operating across −20°C to +60°C ambient.

IC Role / Device Role / Timing Role: Regulated 2.5 V rail for image sensor interface, laser driver control logic, and USB PHY.

Use Value: −3 mV load regulation ensures consistent exposure timing and pixel gain calibration across full 1 A pulsed laser current load.

Use Scenario: Battery-powered video doorbell with motion-triggered wake-up, Wi-Fi SoC, and IR LEDs.

IC Role / Device Role / Timing Role: Always-on 2.5 V supply for PIR sensor, wake-up controller, and RTC - enabled only during motion detection window.

Use Value: CE-controlled standby reduces quiescent draw to ≤1 µA between motion events, enabling >1-year battery life on two AA cells.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-2502E/MB	0.6 µA typical quiescent current vs. 1.0 µA max for NCP694DSAN25T1G; no auto-discharge; SOT-23-5 package	Lacks rapid V_OUT discharge - unsuitable where back-powering must be avoided during shutdown	Select when lowest possible I_Q dominates over discharge speed and thermal performance is less constrained
Torex XC6219B251MR-G	250 mA max output vs. 1 A; 1.0 µA I_Q; same HSON-6 footprint but single V_OUT pin	Insufficient current for high-power RF or imaging subsystems; no dual-V_OUT current sharing	Choose only for space-constrained, sub-250 mA loads where pin count and thermal margin are secondary

Compared with MCP1703T-2502E/MB and XC6219B251MR-G, the NCP694DSAN25T1G uniquely delivers 1 A output with integrated auto-discharge and dual-V_OUT routing in HSON-6 - making it the only option for compact, high-current, rapidly shutting-down portable systems.

Availability

NCP694DSAN25T1G is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial handheld scanners, smart home doorbell cameras, and battery-powered instrumentation requiring stable component supply with guaranteed long-term manufacturability.

Supply support for NCP694DSAN25T1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and portable electronics.

The NCP694DSAN25T1G belongs to the NCP694 series of super-low-dropout LDOs designed specifically for high-current, battery-critical portable applications demanding ultra-low I_Q, fast enable/disable, and robust thermal protection.

FAQ

What is the maximum input voltage rating for the NCP694DSAN25T1G?

The NCP694DSAN25T1G has an absolute maximum input voltage (V_IN) of 6.5 V. Operation above 6.0 V is not recommended for long-term reliability. The device is rated for continuous operation from 1.4 V to 6.0 V input, making it ideal for single-cell Li-ion (up to 4.2 V) and multi-cell alkaline/NiMH systems. Exceeding 6.5 V risks permanent damage to the internal PMOS pass transistor and reference circuitry.

Does the NCP694DSAN25T1G require an external output capacitor, and what type is recommended?

Yes, the NCP694DSAN25T1G requires a minimum 4.7 µF output capacitor for stability. Ceramic X5R or X7R MLCCs are explicitly recommended and fully supported - no ESR requirements apply. Tantalum capacitors may be used but require careful ESR selection to avoid oscillation. The dual V_OUT pins (1 & 2) must both connect to the same output node, and the capacitor should be placed within 2 mm of either pin for optimal transient response.

How does the auto-discharge function operate in the NCP694DSAN25T1G?

The NCP694DSAN25T1G's auto-discharge function activates automatically when the CE pin is driven low, turning on an internal NMOS transistor between V_OUT and GND. This discharges the output capacitance rapidly - typically within 100 µs - preventing back-powering of upstream circuitry or unintended wake-up of downstream ICs. The feature is exclusive to "D" version devices like NCP694DSAN25T1G and is disabled in "H" versions.

What is the thermal performance of the NCP694DSAN25T1G in its HSON-6 package?

The NCP694DSAN25T1G in HSON-6 has a junction-to-ambient thermal resistance (R_JA) of 111°C/W under standard test conditions (1 oz copper, 100 mm² spread area). With a maximum junction temperature of 150°C and 85°C ambient, the device supports up to ~585 mW continuous power dissipation (ΔT = 65°C ÷ 111°C/W). For 1 A output at 2.5 V with 1.0 V dropout (1.0 W dissipation), a thermally enhanced PCB layout with the exposed pad soldered to ≥200 mm² internal ground plane is required.

Can the NCP694DSAN25T1G be used with a 1.8 V enable signal?

Yes, the NCP694DSAN25T1G is fully compatible with 1.8 V GPIOs. Its CE pin has a logic-low threshold (V_TH,LOW) of ≤0.4 V and logic-high threshold (V_TH,HIGH) of ≥1.0 V, providing >1.4 V noise margin against 1.8 V logic. When CE is pulled to 1.8 V, the device operates normally; when pulled to 0 V or ≤0.4 V, it enters standby with auto-discharge enabled. No level-shifting circuitry is needed.

NCP694DSAN25T1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 6-VQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.32V @ 1A (Typ)

Current - Output:: 1A

Current - Quiescent (Iq):: 100 µA

Current - Supply (Max):: -

PSRR:: 70dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-HSON (2.9x3)

NCP694DSAN25T1G FAQ

1.How can I place an order for NCP694DSAN25T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP694DSAN25T1G 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 NCP694DSAN25T1G reliable?

The price and inventory of NCP694DSAN25T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP694DSAN25T1G is usually 5 days.

3.What payment methods are accepted for NCP694DSAN25T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP694DSAN25T1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP694DSAN25T1G?

NCP694DSAN25T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP694DSAN25T1G 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 NCP694DSAN25T1G?

For technical support, including NCP694DSAN25T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP694DSAN25T1G requirements.

6.How does Aetrix verify that NCP694DSAN25T1G is sourced from the original manufacturer or authorized distributors?

All NCP694DSAN25T1G 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 NCP694DSAN25T1G meets industry standards.

7.What is the process for return or replacement of NCP694DSAN25T1G?

All NCP694DSAN25T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP694DSAN25T1G, 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 NCP694DSAN25T1G part is unused and in its original packaging.

Return procedure for NCP694DSAN25T1G:

1.Submit a request within 90 days.

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

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