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ICM7555CBAZ-T

CMOS 555 timer, 1.5-16V, 100uA Iq, SOT-23-5, 500kHz, 1% accuracy

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Manufacturer Part：

ICM7555CBAZ-T

Package：

SOT-23-5 (2.9 x 1.6 x 1.1 mm)

Description

Product Overview

The ICM7555CBAZ-T from Renesas (formerly Intersil) is a CMOS version of the classic 555 timer in a SOT-23-5 package. Unlike the bipolar NE555, the CMOS ICM7555 operates from 1.5V to 16V with only 100uA typical supply current, making it ideal for battery-powered applications. The -T suffix indicates tape-and-reel packaging.

Key Specifications

Supply Voltage	1.5V ~ 16V
Supply Current	100 uA (typ)
Max Oscillation Frequency	500 kHz (typ)
Timing Accuracy	1% (typ)
Output Current (source)	1 mA (typ)
Output Current (sink)	3.2 mA (typ)
Trigger Voltage	1/3 VCC
Threshold Voltage	2/3 VCC
Package	SOT-23-5 (2.9 x 1.6 x 1.1 mm)
Operating Temperature	-40C to +85C

Features

CMOS construction draws only 100uA supply current versus 3mA for bipolar NE555
Wide 1.5V to 16V operating range for battery-powered and low-voltage systems
SOT-23-5 package for minimal board footprint
1% timing accuracy for precision delay and oscillation
Directly interchangeable with bipolar 555 in most circuits

Applications

Battery-powered timing and delay circuits
Low-frequency oscillator for watchdog and clock generation
Pulse-width modulation for LED dimming
Power-on reset and debounce timing

Product Introduction:ICM7555CBAZ-T Product Introduction

The Renesas ICM7555CBAZ-T is a CMOS implementation of the industry-standard 555 timer in a tiny SOT-23-5 surface-mount package. The CMOS construction reduces supply current from the 3mA typical of the bipolar NE555 to just 100uA, enabling operation from low-voltage battery sources. The wide 1.5V to 16V supply range covers single-cell alkaline through 12V systems. Despite the lower output drive capability (1mA source, 3.2mA sink) compared to the bipolar 555, the ICM7555 is directly interchangeable in most timing circuits that drive high-impedance loads such as CMOS logic inputs, MOSFET gates, and LED indicators. The SOT-23-5 package is ideal for space-constrained designs where the 8-pin DIP or SOIC NE555 would be too large.

Working Principle:ICM7555CBAZ-T Working Principle

The ICM7555 uses CMOS comparators and output stage instead of bipolar, reducing supply current from mA to uA range. In monostable (one-shot) mode, a trigger pulse starts the timing interval by charging the external capacitor through the external resistor. The output returns low when the capacitor voltage reaches 2/3 of VCC. In astable (free-running) mode, the capacitor charges and discharges between 1/3 and 2/3 VCC, producing a continuous square wave output whose frequency and duty cycle are set by two external resistors and one capacitor. The CMOS output stage provides rail-to-rail output swing.

Pin Description:ICM7555CBAZ-T Pin Definition and Functions

Pin	Name	Type	Function
1	GND	Power	Ground
2	TRIGGER	Input	Trigger input (active low)
3	OUTPUT	Output	Timer output
4	RESET	Input	Reset input (active low, tie to VCC)
5	CONTROL	Analog	Control voltage (bypass with 0.01uF)