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MCP120T-270I/TT

Voltage supervisor, 2.625V trip, open-drain reset, 350ms timeout, SOT-23-3

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Manufacturer Part：

MCP120T-270I/TT

Package：

SOT-23-3 (2.9 x 1.3 mm)

Description

Product Overview

The MCP120T-270I/TT from Microchip Technology is a microcontroller supervisory circuit with open-drain reset output and 2.625V trip voltage. Holding the microcontroller in reset until supply voltage stabilizes, it provides precision brown-out protection in a tiny SOT-23-3 package.

Key Specifications

Function	Voltage Supervisor
Trip Voltage	2.55V to 2.70V (270)
Reset Output	Active low, open-drain
Reset Timeout	350 ms (typical)
Operating Voltage	1V to 5.5V
Operating Current	45 μA (typical)
Accuracy	±75mV over temperature
Package	SOT-23-3
Operating Temperature	-40°C to +85°C

Features

Precision 2.625V nominal trip voltage for 2.7V systems
Open-drain active-low reset output
350ms reset timeout holds MCU in reset during stabilization
Reset valid down to VCC = 1.0V for reliable power-down behavior
Low 45μA typical operating current

Applications

2.7V microcontroller brown-out detection and reset
Power supply monitoring in battery-operated systems
Embedded system power-on reset generation
FPGA and CPLD power sequencing supervision
Industrial controller watchdog reset

Product Introduction:MCP120T-270I/TT Product Introduction

The MCP120T-270I/TT from Microchip Technology is a voltage supervisory circuit designed to keep a microcontroller in reset until the system supply voltage reaches and stabilizes at the proper operating level, and to protect against brown-out conditions when the supply drops below safe levels. The -270 trip voltage variant has a nominal threshold of 2.625V (range 2.55V to 2.70V) with ±75mV accuracy over temperature, making it ideal for monitoring 2.7V logic supplies. The open-drain active-low reset output is asserted whenever VDD falls below the trip point and is held for 350ms after VDD rises above threshold, ensuring the microcontroller has sufficient time to stabilize before beginning execution.

Working Principle:MCP120T-270I/TT Working Principle

The MCP120T-270I/TT operates as a precision voltage detector. (1) The internal voltage reference and comparator continuously monitor the VDD supply voltage against the trip-point threshold (2.625V nominal for the -270 variant). When VDD drops below the trip point, the reset output is immediately asserted (driven low via the open-drain output). (2) When VDD rises above the trip point, the internal timeout counter begins, holding the reset output low for 350ms (typical) to allow the power supply and clock oscillator to stabilize before the microcontroller begins executing code. (3) The open-drain output requires an external pull-up resistor to the logic supply and can be wire-ORed with other open-drain reset sources. The reset function remains valid down to VDD = 1.0V, ensuring the microcontroller is held in a known state even during deep power-down transients.

Pin Description:MCP120T-270I/TT Pin Definition and Functions

Pin	Name	Function
1	VDD	Power supply (1V to 5.5V)
2	GND	Ground
3	RESET	Active-low reset output (open-drain)

Application Scenarios:In which products and applications isMCP120T-270I/TT used

2.7V microcontroller power-on reset and brown-out protection
Battery-powered system low-voltage detection and safe shutdown
FPGA and CPLD configuration voltage monitoring during power-up
Industrial controller supervisory reset for reliable startup
Multi-voltage system power sequencing with open-drain wire-OR

Alternative Models:What chips are recommended as replacements for MCP120T-270I/TT

Model	Manufacturer	Key Difference
MCP130T-270I/TT	Microchip	With internal 5kΩ pull-up resistor
MCP120T-300I/TT	Microchip	3.0V trip voltage variant
MCP120T-315I/TT	Microchip	3.15V trip voltage variant
TLV803EA29DBZR	TI	2.93V supervisor, SOT-23-3
MAX809TR29	Maxim	2.93V supervisor, SOT-23-3