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

Microchip Technology MCP1703T-1802E/MC

Name: MCP1703T-1802E/MC
Brand: Microchip Technology
SKU: MCP1703T-1802E/MC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP1703T-1802E/MC

Manufacturer:: Microchip Technology

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

Package:: 8-VFDFN Exposed Pad

Datasheet:: MCP1703T-1802E/MC.pdf

Description:: IC REG LINEAR 1.8V 200MA 8DFN

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Product details

Overview

MCP1703T-1802E/MC from Microchip Technology is a CMOS low-dropout (LDO) linear voltage regulator delivering 250 mA output current at 1.8 V with 2.0 µA typical quiescent current, 625 mV typical dropout voltage @ 250 mA (V_OUT = 2.8 V), ±0.4% output voltage tolerance at +25°C, and stable operation with 1.0–22 µF ceramic output capacitance - deployed in battery-powered smoke detectors, CO₂ sensors, and microcontroller power rails.

For engineers reviewing the MCP1703T-1802E/MC datasheet, MCP1703T-1802E/MC pinout, MCP1703T-1802E/MC application, or MCP1703T-1802E/MC equivalent, key selection criteria include ultra-low I_Q, input range (2.7–16.0 V), thermal shutdown behavior, SOT-23A package thermal resistance (θ_JA = 336°C/W), and compatibility with 1 µF ceramic output capacitors.

Technical Context

The MCP1703T-1802E/MC uses a P-channel PMOS pass transistor controlled by an internal error amplifier comparing feedback against a precision bandgap reference. Regulation is maintained across input voltages from 2.7 V to 16.0 V and load currents up to 250 mA for 1.8 V output, with dropout defined as the VIN–VOUT differential causing 2% output deviation.

Protection circuitry includes overcurrent limiting (400 mA short-circuit current) and thermal shutdown triggered at +150°C junction temperature, with automatic recovery at ~+130°C. Output stability is guaranteed with 1.0–22 µF X7R ceramic capacitors and ESR ≤ 2.0 Ω, supporting low-noise (8 µV/√Hz @ 1 kHz) and high PSRR (44 dB @ 100 Hz) performance.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.8 V nominal, ±0.4% tolerance at +25°C - ensures accurate biasing of 1.8 V logic and analog circuits without calibration.
Quiescent Current	2.0 µA typical - enables multi-year battery life in always-on sensor nodes drawing <100 µA average current.
Dropout Voltage	625 mV typical @ 250 mA (V_OUT = 2.8 V); for 1.8 V output, dropout remains ≤750 mV - supports regulation from two alkaline cells (3.0 V fresh) down to end-of-life (~2.7 V).
Input Voltage Range	2.7 V to 16.0 V - accommodates 2–6 alkaline cells, single/dual Li-ion, and 9 V batteries without external pre-regulation.
Max Output Current	250 mA continuous for V_OUT ≥ 2.5 V; 200 mA for V_OUT < 2.5 V - sufficient for MCU cores, RF transceivers, and analog front-ends in portable instrumentation.
Thermal Protection	Shuts down at +150°C junction temperature, restarts at ~+130°C - prevents permanent damage during sustained overload or poor PCB heatsinking.
Output Capacitance	Stable with 1.0–22 µF ceramic (X7R) - eliminates need for tantalum or electrolytic caps, reducing BOM cost and board area.

Pinout & Package

Package: SOT-23A (3-pin, JEDEC MO-178AA), footprint-compatible with industry-standard SOT-23 packages; thermal pad absent - thermal performance governed by θ_JA = 336°C/W on 4-layer FR-4 board.

Pin	Circuit Role	Design Meaning
1	VIN	Unregulated input supply; requires low-impedance source (≤10 Ω) and ≥1 µF ceramic decoupling close to pin for stability.
2	GND	Regulator ground reference; carries only 2.0 µA bias current - minimal trace width needed, but must be low-impedance path to load return.
3	VOUT	Regulated 1.8 V output; supplies full load current - place 1 µF ceramic capacitor within 2 mm of this pin for optimal transient response.

Key Features

Feature	Design Value
Ultra-low quiescent current	2.0 µA typical enables >10-year battery life in 20 µA average-load applications like wireless smoke alarms.
Low-ESR ceramic capacitor support	Stable with 1–22 µF X7R ceramics - avoids costly tantalum caps and simplifies layout with no ESR tuning required.
Integrated protection	Overcurrent limit (400 mA short-circuit) and thermal shutdown (+150°C) eliminate need for external fault management circuitry.
Precision output tolerance	±0.4% at +25°C and ±3% over –40°C to +125°C - reduces system-level calibration burden in industrial sensor modules.
High PSRR at low frequency	44 dB @ 100 Hz - suppresses ripple from switching converters or noisy battery sources feeding downstream ADCs or RF ICs.

Applications

Smoke Detector Power	CO₂ Sensor Bias
Use Scenario: Standby-powered optical smoke chamber with periodic self-test pulses and wireless alert transmission. IC Role / Device Role / Timing Role: Primary 1.8 V rail for MCU, IR LED driver, and RF transceiver; regulates from 3.0 V alkaline stack. Use Value: 2.0 µA I_Q extends 9 V battery life beyond 5 years; 625 mV dropout allows operation until cell voltage drops to 2.42 V.	Use Scenario: NDIR-based CO₂ monitor operating continuously in HVAC ducts with wide ambient temperature swing. IC Role / Device Role / Timing Role: Precision 1.8 V reference for thermopile amplifier and ADC; rejects line noise from shared 12 V supply. Use Value: ±0.4% initial tolerance and 50 ppm/°C TCV_OUT minimize gas concentration measurement drift across –25°C to +60°C.
Smart Battery Pack Monitor	Industrial Data Logger
Use Scenario: Fuel-gauge IC and protection circuitry inside Li-ion pack housing, powered from cell stack via step-down converter. IC Role / Device Role / Timing Role: Clean 1.8 V supply for coulomb counter and SMBus interface; rejects switching noise from buck converter. Use Value: 44 dB PSRR at 100 Hz attenuates 100 mV_pk-pk ripple to <2 mV_pk-pk, preventing communication errors on SMBus lines.	Use Scenario: Solar-charged remote environmental logger sampling temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: Main 1.8 V domain regulator for ultra-low-power MCU and flash memory; operates from 3.6–14 V solar input. Use Value: 2.7–16.0 V input range accepts variable solar panel output; 1 µF ceramic stability reduces bill-of-materials count and failure modes.

Smoke Detector Power

CO₂ Sensor Bias

Use Scenario: Standby-powered optical smoke chamber with periodic self-test pulses and wireless alert transmission.

IC Role / Device Role / Timing Role: Primary 1.8 V rail for MCU, IR LED driver, and RF transceiver; regulates from 3.0 V alkaline stack.

Use Value: 2.0 µA I_Q extends 9 V battery life beyond 5 years; 625 mV dropout allows operation until cell voltage drops to 2.42 V.

Use Scenario: NDIR-based CO₂ monitor operating continuously in HVAC ducts with wide ambient temperature swing.

IC Role / Device Role / Timing Role: Precision 1.8 V reference for thermopile amplifier and ADC; rejects line noise from shared 12 V supply.

Use Value: ±0.4% initial tolerance and 50 ppm/°C TCV_OUT minimize gas concentration measurement drift across –25°C to +60°C.

Smart Battery Pack Monitor

Industrial Data Logger

Use Scenario: Fuel-gauge IC and protection circuitry inside Li-ion pack housing, powered from cell stack via step-down converter.

IC Role / Device Role / Timing Role: Clean 1.8 V supply for coulomb counter and SMBus interface; rejects switching noise from buck converter.

Use Value: 44 dB PSRR at 100 Hz attenuates 100 mV_pk-pk ripple to <2 mV_pk-pk, preventing communication errors on SMBus lines.

Use Scenario: Solar-charged remote environmental logger sampling temperature/humidity every 10 minutes.

IC Role / Device Role / Timing Role: Main 1.8 V domain regulator for ultra-low-power MCU and flash memory; operates from 3.6–14 V solar input.

Use Value: 2.7–16.0 V input range accepts variable solar panel output; 1 µF ceramic stability reduces bill-of-materials count and failure modes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P182MR-G	1.8 V, 250 mA, 1.0 µA I_Q, SOT-23-3, but only rated to 6.0 V input - lacks 16 V capability and thermal shutdown.	Suitable for low-voltage systems (≤6 V) where lowest possible I_Q is critical; not viable for 9 V battery or multi-cell alkaline inputs.	Select when input never exceeds 6 V and sub-2 µA I_Q justifies reduced protection and voltage range.
ON Semiconductor NCP170AMX180TCG	1.8 V, 250 mA, 500 nA I_Q, SOT-23-3, 6 V max input, no thermal shutdown - superior I_Q but narrower voltage and safety scope.	Optimized for energy-harvesting or coin-cell applications with strict <1 µA budget; cannot replace MCP1703T-1802E/MC in 9 V or Li-ion systems.	Choose only for ultra-low-power designs with ≤6 V input and no thermal stress risk; verify absence of thermal protection aligns with system safety requirements.

Compared with XC6206P182MR-G and NCP170AMX180TCG, the MCP1703T-1802E/MC uniquely balances 16 V input tolerance, integrated thermal shutdown, and 2.0 µA I_Q - making it the sole option among these three for robust, wide-input, battery-backed industrial sensing without compromising longevity.

Availability

MCP1703T-1802E/MC is available at Aetrix Electronics and suitable for battery-powered smoke detectors, CO₂ sensors, and microcontroller power rails requiring stable component supply across extended production lifecycles.

Supply support for MCP1703T-1802E/MC 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with broad automotive, industrial, and consumer design-in support.

The MCP1703 product line delivers micropower LDO regulators optimized for battery longevity and wide-input operation in safety-critical and portable instrumentation - targeting applications where quiescent current, dropout, and reliability outweigh raw speed or integration.

FAQ

What is the maximum input voltage rating for the MCP1703T-1802E/MC?

The MCP1703T-1802E/MC has an absolute maximum input voltage rating of +18 V, with a recommended operating range of 2.7 V to 16.0 V. Exceeding 18 V risks permanent damage per Absolute Maximum Ratings. The device maintains regulation across its full 2.7–16.0 V operating window, enabling use with 9 V alkaline batteries and multi-cell Li-ion stacks without external clamping.

Does the MCP1703T-1802E/MC require an external capacitor on the VOUT pin?

Yes, the MCP1703T-1802E/MC requires a minimum 1.0 µF ceramic (X7R) output capacitor placed within 2 mm of the VOUT pin for small-signal stability. The datasheet confirms stability with 1–22 µF ceramic capacitors and ESR up to 2.0 Ω. Omitting this capacitor causes oscillation and unregulated output, regardless of load current.

What is the thermal shutdown behavior of the MCP1703T-1802E/MC?

The MCP1703T-1802E/MC activates thermal shutdown at +150°C junction temperature and automatically recovers when junction temperature falls to approximately +130°C. This hysteresis prevents rapid cycling during overload. The SOT-23A package's θ_JA = 336°C/W means even modest power dissipation (e.g., 150 mW) raises junction temperature significantly above ambient - PCB copper area directly impacts trip point timing.

Can the MCP1703T-1802E/MC be used as a precision voltage reference?

Yes, the MCP1703T-1802E/MC is explicitly qualified for voltage reference use: its ±0.4% output tolerance at +25°C, 50 ppm/°C temperature coefficient, and low 8 µV/√Hz noise make it suitable for ratio-metric ADC references in microcontroller-based sensors. Application Note AN765 confirms its use in calibrated bridge sensor interfaces where initial offset is trimmed in production.

Is the MCP1703T-1802E/MC pin-compatible with other SOT-23-3 LDOs?

No - while the MCP1703T-1802E/MC uses the standard SOT-23A outline, its pinout (VIN–GND–VOUT) differs from common alternatives like the LM1117 (VIN–VOUT–GND) and AP2112 (VIN–GND–VOUT). Physical fit does not guarantee functional compatibility; PCB layout must match the specific VIN/GND/VOUT assignment shown in DS22049F Figure 3-1.

MCP1703T-1802E/MC Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-VFDFN Exposed Pad

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):: 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 200mA

Current - Quiescent (Iq):: 5 µA

Current - Supply (Max):: -

PSRR:: 44dB (100Hz)

Control Features:: -

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

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN (2x3)

MCP1703T-1802E/MC FAQ

1.How can I place an order for MCP1703T-1802E/MC through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP1703T-1802E/MC 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 MCP1703T-1802E/MC reliable?

The price and inventory of MCP1703T-1802E/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1703T-1802E/MC is usually 5 days.

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MCP1703T-1802E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP1703T-1802E/MC 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 MCP1703T-1802E/MC?

For technical support, including MCP1703T-1802E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1703T-1802E/MC requirements.

6.How does Aetrix verify that MCP1703T-1802E/MC is sourced from the original manufacturer or authorized distributors?

All MCP1703T-1802E/MC 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 MCP1703T-1802E/MC meets industry standards.

7.What is the process for return or replacement of MCP1703T-1802E/MC?

All MCP1703T-1802E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1703T-1802E/MC, 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 MCP1703T-1802E/MC part is unused and in its original packaging.

Return procedure for MCP1703T-1802E/MC:

1.Submit a request within 90 days.

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

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