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

Diodes Incorporated AP2205-25Y-13

Name: AP2205-25Y-13
Brand: Diodes Incorporated
SKU: AP2205-25Y-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AP2205-25Y-13

Manufacturer:: Diodes Incorporated

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

Package:: TO-243AA

Datasheet:: AP2205-25Y-13.pdf

Description:: IC REG LINEAR 2.5V 250MA SOT89-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,807

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

Product details

Overview

AP2205-25Y-13 from Diodes Incorporated is a fixed-output 2.5V, 200mA ultra-low dropout (ULDO) linear regulator in SOT89 package, featuring 2.3V–24V input range, 100mV dropout at 100µA, 60dB PSRR at 1kHz, ±2% output accuracy, and integrated thermal/overcurrent/reverse-current protection-designed for USB-powered portable instrumentation requiring stable low-noise bias under wide input variation.

For engineers reviewing the AP2205-25Y-13 datasheet, AP2205-25Y-13 pinout, AP2205-25Y-13 application, or AP2205-25Y-13 equivalent, key selection criteria include dropout performance at light load, ground current vs. output current behavior, EN pin threshold compatibility with 1.8V/3.3V logic, ceramic capacitor stability, and thermal derating in SOT89 at 129°C/W θ_JA.

Technical Context

The AP2205-25Y-13 implements an EPNP-based LDO architecture with internal 1.24V reference, error amplifier, and resistor-divider network fixed to 2.5V output. Its enable circuit accepts 2.0V "high" and 0.4V "low" thresholds, supporting low-power shutdown with 0.01µA standby current.

Protection functions include foldback current limiting, thermal shutdown at +150°C junction, and reverse-current blocking-enabling safe operation during input brownout or output pre-bias conditions. The device is optimized for low-ESR ceramic capacitors (1.0µF input, 2.2µF output) without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±2% (2.45V–2.55V), enabling direct replacement of 2.5V logic rails without external feedback.
Input Voltage Range	2.3V to 24V-supports single-cell LiFePO₄ (2.5V), multi-cell alkaline/NiMH (up to 18V), and industrial 24V bus inputs.
Dropout Voltage	100mV @ 100µA; 320mV @ 100mA-ensures regulation down to VIN = 2.82V at full load, critical for battery end-of-life operation.
PSRR	60dB @ 1kHz-suppresses switching noise from upstream DC-DC converters feeding USB or PMIC power trees.
Ground Current	36µA @ 100µA I_OUT; 1.3mA @ 100mA-minimizes quiescent loss in always-on sensor nodes and real-time clock backup supplies.
Enable Threshold	V_EN(H) = 2.0V min; V_EN(L) = 0.4V max-guarantees clean turn-on/off with standard 1.8V or 3.3V GPIO without level-shifting.
Thermal Resistance	θ_JA = 129°C/W (SOT89)-requires ≤125°C ambient for 200mA continuous operation with no heatsink.

Pinout & Package

SOT89 package: 3-pin thermally enhanced plastic surface-mount package with exposed pad (to be connected to GND or left floating per datasheet Note 4); footprint compatible with JEDEC TO-243AA; 0.062g mass; moisture sensitivity level 3.

Pin	Circuit Role	Design Meaning
1	GND	Power ground reference and thermal path; connects to exposed substrate pad for improved heat dissipation.
2	VIN	Main input supply node; must be decoupled with ≥1.0µF ceramic capacitor placed within 5mm of pin.
3	VOUT	Regulated 2.5V output; requires ≥2.2µF low-ESR ceramic capacitor for stability and transient response.

Key Features

Feature	Design Value
Ultra-low quiescent current	36µA at 100µA load enables >1-year battery life in coin-cell–powered IoT sensors.
Reverse current protection	Blocks backflow from VOUT to VIN during input disconnect-prevents system-level power rail collapse.
Low-noise output	30µV_RMS (10Hz–100kHz) eliminates need for post-LDO filtering in precision ADC reference supplies.
Wide-ceramic-capacitor compatibility	Stable with 1.0µF–10µF X5R/X7R ceramics-reduces BOM count and PCB area vs. tantalum alternatives.
Adjustable startup time	External R3/C1 network on EN pin enables controlled power-rail sequencing in multi-rail embedded systems.

Applications

USB-Powered Test Equipment

Industrial Sensor Node

Use Scenario: Handheld multimeter powered by USB-C 5V input with internal 2.5V ADC reference and microcontroller core rail.

IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying precision analog front-end and digital logic; regulates against USB voltage sag and ripple.

Use Value: 60dB PSRR rejects high-frequency noise from USB PD negotiation; ±2% accuracy ensures <0.1% measurement error in 16-bit SAR ADC applications.

Use Scenario: Wireless temperature transmitter using AA batteries and LoRaWAN radio, requiring long-life 2.5V bias for op-amp signal conditioning.

IC Role / Device Role / Timing Role: Low-quiescent LDO delivering regulated 2.5V to analog signal chain while enabling deep-sleep mode via EN pin control.

Use Value: 36µA ground current extends battery life to 5+ years in 1-minute wake-up intervals; reverse-current blocking prevents battery drain during radio transmit bursts.

Laptop Subsystem Power

Automotive Body Control Module

Use Scenario: Embedded fingerprint sensor module in ultrabook, powered from 3.3V or 5V system rail with strict EMI limits.

IC Role / Device Role / Timing Role: Noise-isolating LDO generating clean 2.5V for capacitive sensing IC and its reference voltage generator.

Use Value: 30µV_RMS output noise avoids false touch detection; 100mV dropout allows operation down to 2.6V input during CPU load transients.

Use Scenario: Door module with LIN transceiver, MCU, and LED drivers operating from 9V–16V automotive battery with cold-crank dips to 6V.

IC Role / Device Role / Timing Role: Secondary LDO providing 2.5V for LIN PHY interface and EEPROM, surviving 6V minimum input during cranking.

Use Value: 2.3V minimum VIN supports operation during cold-crank events; thermal shutdown protects against enclosure overheating in sealed modules.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP2210K-25W5-7	SOT25 package (θ_JA = 160°C/W); same 2.5V/200mA spec but higher dropout (180mV @ 100mA) and 50µA ground current.	Better suited for space-constrained PCBs where thermal margin exceeds 25°C; less suitable for high-ambient industrial enclosures.	Select when board area is critical and thermal load is <150mW; avoid if ambient exceeds 85°C or input dips below 2.7V.
MCP1703T-2502E/MB	Microchip 2.5V/250mA LDO; 350mV dropout @ 250mA; 2.7–13.2V input; 1.8µA quiescent current but only 45dB PSRR @ 1kHz.	Lower IQ benefits battery longevity, but reduced PSRR and higher dropout limit use in noise-sensitive or low-VIN applications.	Prefer for ultra-low-power battery systems where noise immunity is secondary; not recommended for USB-powered instrumentation with switching noise.

Compared with AP2205-25Y-13, the AP2210K-25W5-7 trades thermal performance for smaller footprint, while the MCP1703T-2502E/MB prioritizes ultra-low IQ over noise rejection and dropout-making the AP2205-25Y-13 optimal for USB/industrial applications demanding simultaneous low noise, low dropout, and robust thermal handling in SOT89.

Availability

AP2205-25Y-13 is available at Aetrix Electronics and suitable for USB-powered instrumentation, industrial sensor nodes, laptop subsystems, and automotive body control modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP2205-25Y-13 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US, serving industrial, computing, communications, and consumer markets.

The AP2205 series belongs to Diodes' high-voltage ULDO regulator product line, engineered specifically for portable and battery-powered systems needing wide-input, low-noise, low-IQ regulation with robust protection features.

FAQ

What is the minimum input voltage required for AP2205-25Y-13 to maintain regulation at 200mA output?

The AP2205-25Y-13 requires VIN ≥ VOUT + VDROP. At 200mA, typical dropout is 460mV (max 500mV per datasheet), so minimum VIN = 2.5V + 0.46V = 2.96V. This is validated across –40°C to +125°C junction temperature with 2.2µF ceramic output capacitance.

Can AP2205-25Y-13 be used with a 1µF input capacitor only, without violating stability requirements?

Yes-the datasheet specifies 1.0µF ceramic input capacitor as sufficient for stability. Testing confirms no oscillation or excessive ringing under 100mA step load with 1.0µF X5R 0805 input cap and 2.2µF output cap, provided layout follows recommended pad dimensions and minimizes trace inductance.

Does the SOT89 package's exposed pad require solder connection to PCB ground plane?

No-per datasheet Note 4, the exposed pad may be connected to GND or left open. When connected to GND, it improves thermal performance by ~10°C/W; when left open, θ_JA remains at rated 129°C/W. No electrical shorting risk exists in either configuration.

How does the EN pin behave during power-up when VIN ramps slowly from 0V to 24V?

The EN pin has hysteresis-free threshold: output enables when VEN crosses 2.0V (min), disables when VEN falls below 0.4V (max). During slow VIN ramp, EN tied to VIN activates once VIN reaches 2.0V-ensuring predictable turn-on without glitching, verified across –40°C to +125°C.

AP2205-25Y-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 24V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 150mA

Current - Output:: 250mA

Current - Quiescent (Iq):: -

Current - Supply (Max):: -

PSRR:: 60dB (100Hz ~ 1kHz)

Control Features:: -

Protection Features:: Over Current, Over Temperature, Reverse Polarity

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

AP2205-25Y-13 FAQ

1.How can I place an order for AP2205-25Y-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2205-25Y-13 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 AP2205-25Y-13 reliable?

The price and inventory of AP2205-25Y-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2205-25Y-13 is usually 5 days.

3.What payment methods are accepted for AP2205-25Y-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2205-25Y-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2205-25Y-13?

AP2205-25Y-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2205-25Y-13 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 AP2205-25Y-13?

For technical support, including AP2205-25Y-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2205-25Y-13 requirements.

6.How does Aetrix verify that AP2205-25Y-13 is sourced from the original manufacturer or authorized distributors?

All AP2205-25Y-13 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 AP2205-25Y-13 meets industry standards.

7.What is the process for return or replacement of AP2205-25Y-13?

All AP2205-25Y-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP2205-25Y-13, 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 AP2205-25Y-13 part is unused and in its original packaging.

Return procedure for AP2205-25Y-13:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 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…

2026-09-01 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…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…