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

Microchip Technology MCP1703AT-2502E/MB

Name: MCP1703AT-2502E/MB
Brand: Microchip Technology
SKU: MCP1703AT-2502E/MB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP1703AT-2502E/MB

Manufacturer:: Microchip Technology

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

Package:: TO-243AA

Datasheet:: MCP1703AT-2502E/MB.pdf

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

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Product details

Overview

MCP1703AT-2502E/MB from Microchip Technology is a 2.5V fixed-output, 250 mA low-dropout (LDO) linear voltage regulator in SOT-23A package, featuring 2.0 µA typical quiescent current, 625 mV typical dropout at 250 mA (V_OUT = 2.8V), ±0.4% output voltage tolerance at +25°C, and stable operation with 1.0 µF ceramic output capacitance. It powers microcontrollers and sensors in battery-powered smoke detectors and CO₂ detectors.

For engineers reviewing the MCP1703AT-2502E/MB datasheet, MCP1703AT-2502E/MB pinout, MCP1703AT-2502E/MB application, or MCP1703AT-2502E/MB equivalent, key selection criteria include ultra-low I_Q, guaranteed 250 mA output at 2.5V, thermal shutdown at 150°C, input range of 2.7V–16.0V, and compatibility with 1 µF–22 µF ceramic output capacitors.

Technical Context

The MCP1703AT-2502E/MB uses a P-channel PMOS pass transistor architecture enabling low dropout and minimal ground current during regulation. Its internal error amplifier compares a fraction of V_OUT against a precision bandgap reference to control pass device conduction.

It integrates overcurrent limiting that cycles off/on under short-circuit conditions and thermal shutdown triggered at 150°C junction temperature with automatic recovery at ~130°C. Line regulation is ±0.1%/V and load regulation is ±1.0% across 1–250 mA for 2.5V output.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±0.4% at +25°C; ±3% over –40°C to +125°C junction range
Max Output Current	250 mA continuous for V_OUT ≥ 2.5V; supports full-rated load without derating at room temperature
Dropout Voltage	625 mV typical @ 250 mA (V_OUT = 2.8V); enables operation from two alkaline cells (3.0V) or single Li-ion (3.6V)
Quiescent Current	2.0 µA typical; extends battery life in always-on sensor nodes and alarm circuits
Input Voltage Range	2.7V to 16.0V; compatible with 2–6 alkaline cells, 9V batteries, and 1–2 Li-ion cells
Stability Capacitance	Stable with 1.0 µF to 22 µF ceramic output capacitor; eliminates need for tantalum or electrolytic types
Thermal Protection	Shuts down at 150°C junction temperature; recovers autonomously at ~130°C

Pinout & Package

SOT-23A 3-pin surface-mount package with exposed thermal pad (EP) internally connected to GND; footprint matches JEDEC TO-236AB standard.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 3)	Unregulated input supply	Connects to source of P-MOS pass transistor; requires ≥1 µF ceramic input capacitor for stability
GND (Pin 2)	Regulator ground reference	Reference node for output regulation; carries only 2.0 µA bias current-not load return path
VOUT (Pin 1)	Regulated output voltage	Delivers up to 250 mA at 2.5V; place 1 µF ceramic capacitor physically adjacent to minimize ESR-induced instability

Key Features

Feature	Design Value
Ultra-low quiescent current	2.0 µA typical enables >10-year battery life in low-duty-cycle IoT sensors
Fast startup time	600 µs output rise time prevents overshoot during power-up sequencing
Low-noise regulation	1 µV/√Hz output noise at 1 kHz supports precision analog front-ends
Robust protection suite	Integrated short-circuit limiting and thermal shutdown prevent field failures in unattended devices
A/D-friendly output	2.5V nominal output aligns with common ADC reference voltages (e.g., 2.5V internal refs)

Applications

Smoke Detector Power Supply	CO₂ Sensor Biasing
Use Scenario: Powers MCU, optical chamber, and buzzer in standalone residential smoke alarms operating from 9V alkaline battery. IC Role / Device Role / Timing Role: Primary 2.5V rail generator; supplies logic core and analog signal chain with stable, low-noise voltage. Use Value: 2.0 µA I_Q extends shelf life and operational runtime beyond 5 years; 625 mV dropout ensures regulation until battery drops to 3.125V.	Use Scenario: Provides clean 2.5V bias for NDIR CO₂ sensor amplifier and ADC in portable air quality monitors. IC Role / Device Role / Timing Role: Precision analog voltage source; referenced by 12-bit ADC for gas concentration calculation. Use Value: ±0.4% output tolerance minimizes calibration drift; 1 µV/√Hz noise avoids SNR degradation in weak-signal detection.
Smart Battery Pack Monitor	Microcontroller Core Supply
Use Scenario: Supplies 2.5V to fuel gauge IC and protection circuitry inside rechargeable Li-ion battery packs. IC Role / Device Role / Timing Role: Always-on LDO for battery management system (BMS) monitoring functions. Use Value: Operates down to 2.7V input-supports full discharge monitoring until cell voltage reaches 2.7V cutoff.	Use Scenario: Delivers regulated 2.5V to ARM Cortex-M0+ MCU in solar-powered environmental data loggers. IC Role / Device Role / Timing Role: Main logic supply; powers CPU, flash, and peripherals during active sampling bursts. Use Value: Stable 1 µF–22 µF ceramic capacitor compatibility simplifies layout; thermal shutdown prevents damage during solar peak-load transients.

Smoke Detector Power Supply

CO₂ Sensor Biasing

Use Scenario: Powers MCU, optical chamber, and buzzer in standalone residential smoke alarms operating from 9V alkaline battery.

IC Role / Device Role / Timing Role: Primary 2.5V rail generator; supplies logic core and analog signal chain with stable, low-noise voltage.

Use Value: 2.0 µA I_Q extends shelf life and operational runtime beyond 5 years; 625 mV dropout ensures regulation until battery drops to 3.125V.

Use Scenario: Provides clean 2.5V bias for NDIR CO₂ sensor amplifier and ADC in portable air quality monitors.

IC Role / Device Role / Timing Role: Precision analog voltage source; referenced by 12-bit ADC for gas concentration calculation.

Use Value: ±0.4% output tolerance minimizes calibration drift; 1 µV/√Hz noise avoids SNR degradation in weak-signal detection.

Smart Battery Pack Monitor

Microcontroller Core Supply

Use Scenario: Supplies 2.5V to fuel gauge IC and protection circuitry inside rechargeable Li-ion battery packs.

IC Role / Device Role / Timing Role: Always-on LDO for battery management system (BMS) monitoring functions.

Use Value: Operates down to 2.7V input-supports full discharge monitoring until cell voltage reaches 2.7V cutoff.

Use Scenario: Delivers regulated 2.5V to ARM Cortex-M0+ MCU in solar-powered environmental data loggers.

IC Role / Device Role / Timing Role: Main logic supply; powers CPU, flash, and peripherals during active sampling bursts.

Use Value: Stable 1 µF–22 µF ceramic capacitor compatibility simplifies layout; thermal shutdown prevents damage during solar peak-load transients.

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	Same electrical specs; differs only in tape-and-reel packaging (no functional difference)	No impact on circuit design or performance; identical pinout and thermal behavior	Select when requiring reel-based automated assembly; same BOM item for most production lines
Torex XC6206P252MR-G	250 mA rated, but 3.0 µA I_Q; 700 mV dropout @ 250 mA; no thermal shutdown	Lacks overtemperature protection; less suitable for sealed enclosures or high-ambient environments	Consider only where ambient temperature stays < 60°C and thermal margin is verified

Compared with MCP1703T-2502E/MB, the MCP1703AT-2502E/MB offers identical regulation performance but is supplied in cut-tape format for prototyping and low-volume builds; versus XC6206P252MR-G, it delivers lower quiescent current, tighter output tolerance, and integrated thermal safety-critical for unattended battery systems.

Availability

MCP1703AT-2502E/MB is available at Aetrix Electronics and suitable for battery-powered alarm circuits, smoke detectors, and CO₂ detectors requiring stable component supply with long-term lifecycle assurance.

Supply support for MCP1703AT-2502E/MB 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

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and Flash-IP solutions, headquartered in Chandler, Arizona.

The MCP1703A product line was designed specifically for ultra-low-power, high-accuracy voltage regulation in space-constrained, battery-operated systems-emphasizing micropower efficiency, wide input range, and robust protection.

FAQ

What is the maximum continuous output current for MCP1703AT-2502E/MB at 2.5V?

The MCP1703AT-2502E/MB delivers 250 mA continuously at 2.5V output when input voltage meets minimum requirements (VIN ≥ VOUT + VDROPOUT). At 250 mA and VOUT = 2.8V, typical dropout is 625 mV-so VIN must be ≥ 3.425V. Derating applies only below 2.5V outputs; this part is rated fully at 250 mA.

Does MCP1703AT-2502E/MB require an external bypass capacitor?

Yes, MCP1703AT-2502E/MB requires a minimum 1.0 µF ceramic output capacitor placed adjacent to the VOUT pin for small-signal stability. Input capacitance of ≥1.0 µF ceramic is also recommended. The device remains stable across 1–22 µF ceramic values-no ESR constraints apply.

What protection features are integrated into MCP1703AT-2502E/MB?

MCP1703AT-2502E/MB integrates short-circuit current limiting and thermal shutdown. Under overload, it cycles on/off to limit average power; at 150°C junction temperature, it shuts down and resumes operation once cooled to ~130°C. No external components are needed to enable these protections.

Can MCP1703AT-2502E/MB operate from a single Li-ion cell?

Yes, MCP1703AT-2502E/MB operates from 2.7V to 16.0V input, making it compatible with a single Li-ion cell (2.7V–4.2V). At end-of-discharge (2.7V), it maintains regulation as long as VOUT + VDROPOUT ≤ VIN-verified at 2.5V output with 625 mV typical dropout, requiring VIN ≥ 3.125V for full 250 mA load.

What is the output voltage tolerance specification for MCP1703AT-2502E/MB over temperature?

MCP1703AT-2502E/MB has ±0.4% typical output voltage tolerance at +25°C and ±3% maximum over the full –40°C to +125°C junction temperature range. This tight initial tolerance reduces system-level calibration burden, especially in precision sensor interfaces where 2.5V serves as ADC reference.

MCP1703AT-2502E/MB Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

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):: 16V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.1V @ 250mA

Current - Output:: 250mA

Current - Quiescent (Iq):: 5 µA

Current - Supply (Max):: -

PSRR:: 35dB (100Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature, Short Circuit

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

MCP1703AT-2502E/MB FAQ

1.How can I place an order for MCP1703AT-2502E/MB through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP1703AT-2502E/MB 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 MCP1703AT-2502E/MB reliable?

The price and inventory of MCP1703AT-2502E/MB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1703AT-2502E/MB is usually 5 days.

3.What payment methods are accepted for MCP1703AT-2502E/MB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1703AT-2502E/MB transactions.

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MCP1703AT-2502E/MB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP1703AT-2502E/MB 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 MCP1703AT-2502E/MB?

For technical support, including MCP1703AT-2502E/MB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1703AT-2502E/MB requirements.

6.How does Aetrix verify that MCP1703AT-2502E/MB is sourced from the original manufacturer or authorized distributors?

All MCP1703AT-2502E/MB 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 MCP1703AT-2502E/MB meets industry standards.

7.What is the process for return or replacement of MCP1703AT-2502E/MB?

All MCP1703AT-2502E/MB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1703AT-2502E/MB, 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 MCP1703AT-2502E/MB part is unused and in its original packaging.

Return procedure for MCP1703AT-2502E/MB:

1.Submit a request within 90 days.

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

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