My Inquiry
My Account
onsemi NCP4685ESQ25T1G
- Part No.:
- NCP4685ESQ25T1G
- Manufacturer:
- onsemi
- Package:
- SC-82A, SOT-343
- Datasheet:
-
NCP4685ESQ25T1G.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SC82AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,762
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
NCP4685ESQ25T1G from onsemi is a 150 mA, ultra-low-quiescent-current CMOS low-dropout linear regulator optimized for always-on applications requiring minimal standby power. It delivers a fixed 2.5 V output with ±0.8% accuracy over −40°C to +85°C, 0.34 V dropout at 150 mA (VOUT = 2.5 V), and operates from 1.70 V to 5.25 V input. It is used in battery-powered consumer electronics where supply current must remain below 1.5 µA under load.
For engineers reviewing the NCP4685ESQ25T1G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 150 mA output capability, ultra-low 1.0 µA typical quiescent current, ceramic-capacitor stability (≥0.1 µF), ±40 ppm/°C output voltage temperature coefficient, and SC-82AB package compatibility with space-constrained PCB layouts.
Technical Context
The NCP4685ESQ25T1G implements a CMOS-based LDO architecture with integrated fold-back current limiting for short-circuit protection and no enable (CE) pin-distinguishing it from the NCP4682 family. Its internal reference and error amplifier maintain tight regulation across input voltage (1.70–5.25 V) and load (1–150 mA) variations while minimizing thermal drift via ±40 ppm/°C tempco.
Unlike NCP4682 variants, this device omits chip enable and auto-discharge circuitry, resulting in lower quiescent current (1.0 µA typ.) and simplified biasing. It achieves stable operation with 0.1 µF ceramic output capacitors and exhibits 30 dB PSRR at 1 kHz, making it suitable for noise-sensitive analog and mixed-signal rails in portable equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±0.8% (ensures consistent logic-level supply for 2.5 V I/O domains) |
| Max Output Current | 150 mA continuous (supports moderate-power microcontrollers and sensors) |
| Quiescent Current | 1.0 µA typical (enables multi-year battery life in always-on IoT endpoints) |
| Dropout Voltage | 0.34 V at 150 mA (allows operation down to 2.84 V input for 2.5 V rail) |
| Input Voltage Range | 1.70 V to 5.25 V (compatible with single Li-ion, 3.3 V, and 5 V systems) |
| Tempco | ±40 ppm/°C (limits output drift to ±1.0 mV over −40°C to +85°C) |
| PSRR @ 1 kHz | 30 dB (attenuates switching noise from upstream DC-DC converters) |
Pinout & Package
Package: SC-82AB (Case 419C), 3-pin surface-mount package measuring 1.8 × 1.15 mm with 0.65 mm pitch; exposed pad connected to GND for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.70–5.25 V; requires 0.1 µF ceramic decoupling capacitor placed adjacent to pin |
| GND | Ground reference and thermal path | Primary return path; exposed pad must be soldered to PCB ground plane for thermal performance |
| VOUT | Regulated output terminal | Delivers stable 2.5 V; supports ≥0.1 µF ceramic output capacitor for loop stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0 µA typical enables >10-year battery life in coin-cell-powered devices |
| Ceramic capacitor stability | Stable with ≥0.1 µF X5R/X7R ceramics-eliminates need for larger, costlier tantalum caps |
| Fold-back current limit | 40 mA short-circuit current limits power dissipation during fault conditions |
| High output accuracy | ±0.8% over temperature ensures reliable interface timing for 2.5 V logic families |
| Low thermal resistance | RJA = 263 °C/W (SC-82AB) allows 150 mA operation up to +70°C ambient without heatsinking |
Applications
| Wireless Sensor Node Power | USB-Powered Peripherals |
|---|---|
Use Scenario: Low-power environmental sensor node powered by CR2032 coin cell, transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Primary 2.5 V LDO supplying MCU core, RF transceiver, and analog sensor interface. Use Value: 1.0 µA quiescent current extends battery life beyond 5 years; 0.34 V dropout enables full utilization of battery voltage down to 2.8 V. |
Use Scenario: USB audio adapter drawing power from USB 2.0 port (5 V), powering DAC and headphone amp ICs. IC Role / Device Role / Timing Role: Post-regulator generating clean 2.5 V reference and analog supply from noisy USB-derived 3.3 V rail. Use Value: 30 dB PSRR at 1 kHz suppresses USB switcher ripple; ±0.8% accuracy ensures consistent DAC reference voltage. |
| Smart Home Controller | Industrial Control Module |
Use Scenario: Battery-backed smart thermostat using supercapacitor backup, requiring always-on 2.5 V rail for real-time clock and memory retention. IC Role / Device Role / Timing Role: Always-on LDO maintaining RTC and SRAM voltage during main power loss. Use Value: Ultra-low IQ prevents supercapacitor discharge during extended outages; ±40 ppm/°C tempco ensures timekeeping accuracy across operating temperature range. |
Use Scenario: DIN-rail mounted PLC I/O module with isolated 24 V input, needing local 2.5 V supply for ADC reference and digital isolator biasing. IC Role / Device Role / Timing Role: Secondary LDO deriving precision 2.5 V from internally generated 3.3 V intermediate rail. Use Value: Stable regulation over 1.7–5.25 V input accommodates wide-range DC-DC output tolerances; SC-82AB footprint saves board area in dense industrial modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/TT | 250 mA output, 1.6 µA IQ, SOT-23-3 package, 0.6 V dropout at 250 mA | Higher output current but higher quiescent current; lacks SC-82AB footprint | Select when >150 mA load or SOT-23-3 layout compatibility is required |
| Torex XC6206P252MR-G | 150 mA output, 1.0 µA IQ, SOT-25 package, 0.16 V dropout at 100 mA | Lower dropout but only rated to 6 V input; no official automotive qualification | Select when lowest possible dropout is critical and input stays ≤6 V |
Compared with MCP1700T-2502E/TT and XC6206P252MR-G, the NCP4685ESQ25T1G offers the optimal balance of ultra-low IQ (1.0 µA), industry-standard SC-82AB footprint, and robust 5.25 V absolute maximum input rating-making it preferred for space-constrained, long-life battery applications demanding proven reliability.
Availability
NCP4685ESQ25T1G is available at Aetrix Electronics and suitable for wireless sensor nodes, USB-powered peripherals, and smart home controllers requiring stable component supply with guaranteed long-term availability and traceable Pb-free sourcing.
Supply support for NCP4685ESQ25T1G 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 manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP4685ESQ25T1G belongs to onsemi's ultra-low-IQ LDO family, designed specifically for always-on, battery-critical applications such as wearables, IoT edge nodes, and energy-harvesting systems where micropower operation is non-negotiable.
FAQ
What is the maximum input voltage rating for the NCP4685ESQ25T1G?
The NCP4685ESQ25T1G has an absolute maximum input voltage of 6.0 V per its datasheet Absolute Maximum Ratings table. However, the recommended operating input voltage range is 1.70 V to 5.25 V. Operation above 5.25 V is not advised for continuous use, as electrical characteristics are only guaranteed within the specified operating range.
Does the NCP4685ESQ25T1G include an enable (CE) pin?
No, the NCP4685ESQ25T1G does not include a Chip Enable (CE) pin. It is a permanently enabled LDO-unlike the NCP4682 series, which features CE functionality. This design choice contributes to its ultra-low 1.0 µA typical quiescent current and simplifies system-level control logic for always-on applications.
Can the NCP4685ESQ25T1G operate with a 0.1 µF ceramic output capacitor?
Yes, the NCP4685ESQ25T1G is explicitly characterized and guaranteed stable with a minimum 0.1 µF ceramic output capacitor (X5R or X7R dielectric), as stated in the Features section and confirmed in the Application Information. Larger values improve transient response but are not required for stability.
What is the thermal resistance (RJA) of the NCP4685ESQ25T1G in its SC-82AB package?
The thermal resistance from junction to ambient (RJA) for the NCP4685ESQ25T1G in the SC-82AB package is 263 °C/W, as specified in the Thermal Characteristics table. This value assumes standard JEDEC high-K test board conditions; actual performance improves with PCB copper area connected to the exposed GND pad.
Is the NCP4685ESQ25T1G RoHS-compliant and Pb-free?
Yes, the NCP4685ESQ25T1G is a Pb-free device, as explicitly noted in the Features section ("These are Pb−Free Devices") and confirmed in the Ordering Information table. It complies with RoHS Directive 2011/65/EU and is suitable for environmentally regulated commercial and industrial applications.
NCP4685ESQ25T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 1.5 µA
- Current - Supply (Max):
- -
- PSRR:
- 30dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-82AB
NCP4685ESQ25T1G FAQ
1.How can I place an order for NCP4685ESQ25T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4685ESQ25T1G 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 NCP4685ESQ25T1G reliable?
The price and inventory of NCP4685ESQ25T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4685ESQ25T1G is usually 5 days.
3.What payment methods are accepted for NCP4685ESQ25T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4685ESQ25T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4685ESQ25T1G?
NCP4685ESQ25T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4685ESQ25T1G 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 NCP4685ESQ25T1G?
For technical support, including NCP4685ESQ25T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4685ESQ25T1G requirements.
6.How does Aetrix verify that NCP4685ESQ25T1G is sourced from the original manufacturer or authorized distributors?
All NCP4685ESQ25T1G 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 NCP4685ESQ25T1G meets industry standards.
7.What is the process for return or replacement of NCP4685ESQ25T1G?
All NCP4685ESQ25T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4685ESQ25T1G, 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 NCP4685ESQ25T1G part is unused and in its original packaging.
Return procedure for NCP4685ESQ25T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NCP4685ESQ25T1G Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
