Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi FAN2502S315X

Name: FAN2502S315X
Brand: onsemi
SKU: FAN2502S315X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: FAN2502S315X

Manufacturer:: onsemi

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

Package:: SC-74A, SOT-753

Datasheet:: FAN2502S315X.pdf

Description:: IC REG LIN 3.15V 150MA SOT23-5

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,373

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

FAN2502S315X from Fairchild Semiconductor is a 3.15 V fixed-output CMOS low-dropout (LDO) voltage regulator in SOT-23-5 package, delivering up to 150 mA output current with 150 mV dropout at full load, 25 µA ground current, and enable/shutdown control - designed for power management in portable battery-powered systems.

For engineers reviewing the FAN2502S315X datasheet, pinout, applications, or equivalent options, key selection criteria include fixed 3.15 V output, ultra-low quiescent current, thermal protection, bypass-capacitor–enabled noise reduction, and compatibility with ceramic, tantalum, or electrolytic output capacitors across wide ESR ranges.

Technical Context

The FAN2502S315X uses a P-channel MOSFET series pass element with ~1 Ω on-resistance, enabling low dropout performance superior to bipolar LDOs. Its CMOS error amplifier features low input bias current and references an internal 1.32 V bandgap, ensuring stable regulation without external resistor networks for fixed-voltage variants.

Pin 4 is configured as BYP (bypass), accepting a 470 pF capacitor to reduce output noise; loop stability is maintained across 10 mΩ–10 Ω ESR output capacitors, eliminating strict capacitor type dependencies common in legacy LDOs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.15 V ±2% - ensures precise rail generation for 3.3 V–tolerant logic or analog subsystems.
Dropout Voltage	150 mV at 150 mA - enables operation down to VIN = 3.3 V while maintaining regulation.
Ground Current	25 µA at 150 mA - minimizes battery drain in always-on portable applications.
Enable Threshold	V_IL ≤ 0.4 V, V_IH ≥ 2.0 V - supports direct interfacing with 1.8 V/3.3 V logic without level shifting.
Thermal Shutdown	150 °C junction limit - autonomously disables output during overload to prevent permanent damage.
Noise Performance	<7 µV/√Hz (10 Hz–1 kHz) with 10 µF C_OUT + 0.01 µF C_BYP - meets low-noise requirements for RF front-ends and precision ADCs.
PSRR	43 dB at 120 Hz - suppresses ripple from switching DC/DC stages feeding the LDO input.

Pinout & Package

SOT-23-5 surface-mount package (JEDEC SC-74A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, with exposed pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1 - VIN	Power Input	Accepts 2.7–6.5 V supply; requires ≥2.2 µF input capacitor near pin for transient immunity.
2 - GND	Power Ground	Reference node for all internal circuitry; must connect to local quiet ground plane with minimal trace inductance.
3 - EN	Digital Enable	Active-high logic input; drives output into <1 µA shutdown state when pulled ≤0.4 V.
4 - BYP	Bypass Terminal	High-impedance node for 470 pF–10 nF capacitor to shunt high-frequency noise from internal reference.
5 - VOUT	Regulated Output	Delivers 3.15 V ±2% at up to 150 mA; requires ≥1 µF output capacitor for loop stability.

Key Features

Feature	Design Value
Ultra-low ground current	25 µA at 150 mA load - extends battery life in standby mode of handheld devices.
Wide ESR capacitor tolerance	Stable with 10 mΩ–10 Ω output capacitor ESR - eliminates need for expensive low-ESR ceramics.
Integrated thermal protection	Auto-shutdown at 150 °C junction temperature - prevents thermal runaway during sustained overload.
Low-noise bypass architecture	470 pF BYP capacitor reduces broadband output noise by >10× vs. non-bypassed configuration.
CMOS process technology	Zero input bias current at ADJ/BYP pins - avoids voltage divider loading errors in precision applications.

Applications

Cellular Phone Baseband	Portable Camera Image Sensor
Use Scenario: Powering baseband processor core voltage rail in GSM/TDMA handsets with tight battery voltage headroom. IC Role / Device Role / Timing Role: Primary 3.15 V LDO supplying digital baseband IC requiring stable, low-noise, low-quiescent-current regulation. Use Value: 150 mV dropout allows operation down to 3.3 V battery voltage, extending usable runtime per charge cycle.	Use Scenario: Supplying analog front-end and image signal processor in compact digital cameras. IC Role / Device Role / Timing Role: Fixed-output LDO delivering clean 3.15 V to CCD/CMOS sensor analog blocks and ISP cores. Use Value: Bypass pin support enables sub-7 µV/√Hz noise floor, preserving dynamic range and SNR in high-resolution imaging.
Laptop Subsystem Rail	Wireless Headset Audio Codec
Use Scenario: Generating auxiliary 3.15 V rail for USB controller or touchpad interface in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO providing isolated, low-ripple power to peripheral controllers with enable control. Use Value: Enable pin allows synchronized power gating with system sleep states, reducing idle current to <1 µA.	Use Scenario: Powering stereo audio codec and Bluetooth radio in battery-operated wireless headsets. IC Role / Device Role / Timing Role: Low-noise, low-I_Q regulator for analog audio path and RF transceiver biasing. Use Value: 25 µA ground current at full load minimizes battery depletion during continuous playback or call duration.

Cellular Phone Baseband

Portable Camera Image Sensor

Use Scenario: Powering baseband processor core voltage rail in GSM/TDMA handsets with tight battery voltage headroom.

IC Role / Device Role / Timing Role: Primary 3.15 V LDO supplying digital baseband IC requiring stable, low-noise, low-quiescent-current regulation.

Use Value: 150 mV dropout allows operation down to 3.3 V battery voltage, extending usable runtime per charge cycle.

Use Scenario: Supplying analog front-end and image signal processor in compact digital cameras.

IC Role / Device Role / Timing Role: Fixed-output LDO delivering clean 3.15 V to CCD/CMOS sensor analog blocks and ISP cores.

Use Value: Bypass pin support enables sub-7 µV/√Hz noise floor, preserving dynamic range and SNR in high-resolution imaging.

Laptop Subsystem Rail

Wireless Headset Audio Codec

Use Scenario: Generating auxiliary 3.15 V rail for USB controller or touchpad interface in ultraportable notebooks.

IC Role / Device Role / Timing Role: Secondary LDO providing isolated, low-ripple power to peripheral controllers with enable control.

Use Value: Enable pin allows synchronized power gating with system sleep states, reducing idle current to <1 µA.

Use Scenario: Powering stereo audio codec and Bluetooth radio in battery-operated wireless headsets.

IC Role / Device Role / Timing Role: Low-noise, low-I_Q regulator for analog audio path and RF transceiver biasing.

Use Value: 25 µA ground current at full load minimizes battery depletion during continuous playback or call duration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-315I/TT	300 mA output rating, 1.6 µA quiescent current, no BYP pin - uses different noise-reduction method.	Lacks dedicated bypass terminal; requires external RC filter for equivalent noise performance.	Select when higher output current headroom is needed and board space permits discrete filtering.
TLC7733IPK	3.3 V nominal output (not 3.15 V), includes reset flag output, 120 µA I_Q, SO-8 package.	Provides power-good monitoring but higher ground current and larger footprint.	Select when system-level power sequencing or fault reporting is required over ultra-low-noise operation.

Compared with MCP1700T-315I/TT and TLC7733IPK, the FAN2502S315X uniquely combines 3.15 V precision, integrated BYP noise suppression, and 25 µA I_Q in SOT-23-5 - making it optimal for space-constrained, noise-sensitive, battery-critical portable designs where exact voltage matching and minimal layout overhead matter.

Availability

FAN2502S315X is available at Aetrix Electronics and suitable for cellular phones, portable cameras, and laptop subsystems requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant packaging.

Supply support for FAN2502S315X 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

Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer, acquired by ON Semiconductor in 2016; known for high-performance, cost-optimized power management solutions.

The FAN2502/03 family was engineered specifically for GSM/TDMA handsets and portable computing - prioritizing micropower operation, low dropout, thermal robustness, and compact SOT-23-5 integration.

FAQ

What is the output voltage tolerance of the FAN2502S315X?

The FAN2502S315X delivers a fixed 3.15 V output with ±2% accuracy across operating temperature (−40 °C to +125 °C) and line/load conditions, as specified in the Electrical Characteristics table under ∆V_O. This tolerance ensures reliable operation for 3.3 V I/O interfaces and analog circuits requiring tight voltage rails. The FAN2502S315X achieves this via a trimmed 1.32 V internal bandgap reference and precision feedback network.

Does the FAN2502S315X require an external bypass capacitor?

Yes - the FAN2502S315X has a dedicated BYP pin (Pin 4) optimized for connecting a 470 pF capacitor to ground, which significantly reduces output noise (to <7 µV/√Hz in 10 Hz–1 kHz band). While the device remains functional without it, omitting the bypass capacitor degrades noise performance and may affect SNR in sensitive analog or RF applications powered by the FAN2502S315X.

Can the FAN2502S315X be used with ceramic output capacitors?

Yes - the FAN2502S315X is explicitly designed to maintain loop stability with ceramic, tantalum, or aluminum electrolytic output capacitors having ESR values from 10 mΩ to 10 Ω. A minimum 1 µF ceramic capacitor is recommended for optimal transient response and noise rejection. This wide ESR tolerance eliminates capacitor selection constraints common in older LDOs and simplifies BOM consolidation for the FAN2502S315X.

What is the maximum input voltage for the FAN2502S315X?

The absolute maximum input voltage for the FAN2502S315X is 7 V, but the recommended operating range is 2.7 V to 6.5 V. Exceeding 6.5 V risks exceeding thermal limits under load due to increased power dissipation (P_D = (V_IN − V_OUT) × I_OUT + V_IN × I_GND). Within spec, the FAN2502S315X maintains regulation and thermal protection integrity across its full input range.

How does the enable function behave on the FAN2502S315X?

The EN pin (Pin 3) of the FAN2502S315X is active-high: applying ≥2.0 V enables the output, while ≤0.4 V forces shutdown with ground current reduced to <1 µA. Floating the EN pin causes erratic operation; it must be tied to VIN or a controlled logic signal. This feature allows precise power sequencing and battery conservation in portable systems using the FAN2502S315X.

FAN2502S315X Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6.5V

Voltage - Output (Min/Fixed):: 3.15V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.18V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: -

PSRR:: 43dB (120Hz)

Control Features:: Enable

Protection Features:: Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

FAN2502S315X FAQ

1.How can I place an order for FAN2502S315X through Aetrix?

Please submit a Request for Quotation (RFQ) for FAN2502S315X 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 FAN2502S315X reliable?

The price and inventory of FAN2502S315X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN2502S315X is usually 5 days.

3.What payment methods are accepted for FAN2502S315X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN2502S315X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FAN2502S315X?

FAN2502S315X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FAN2502S315X 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 FAN2502S315X?

For technical support, including FAN2502S315X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN2502S315X requirements.

6.How does Aetrix verify that FAN2502S315X is sourced from the original manufacturer or authorized distributors?

All FAN2502S315X 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 FAN2502S315X meets industry standards.

7.What is the process for return or replacement of FAN2502S315X?

All FAN2502S315X units undergo pre-shipment inspection (PSI). If there is an issue with FAN2502S315X, 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 FAN2502S315X part is unused and in its original packaging.

Return procedure for FAN2502S315X:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

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, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

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.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

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.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

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…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

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…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

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…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

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 …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

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…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

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…