pcbpartpicker.app

RTC

7 parts

Real-time clock ICs keep wall time across power loss from a coin cell, with alarm outputs that can wake a sleeping system — much lower power than keeping an MCU awake.

How to choose

DS3231-class (TCXO) parts hold ±2 ppm over temperature — pick these when drift matters.
Plain 32 kHz-crystal RTCs (PCF8563 etc.) are fine indoors with occasional network time sync.

	Part	LCSC	Description	Package	JLC class
	DS3231MZ/V+ ADI(亚德诺)/MAXIM(美信)	C3304431	DS3231MZ/V+ 2.3V~5.5V I2C Interface:I2C Operating Voltage:2.3V~5.5V Operating Voltage:2.3V~5.5V Operating Temperature:-40℃~+85℃ Operating Temperature:-40℃~+85℃	SOIC-8	Extended Part
	BM8563ESA GATEMODE(捷茂微)	C269877	I2C real-time clock/calendar, 1.2V~5.5V, 500nA supply, external crystal, alarm output, -40°C~+85°C, Iq:0.5uA	SOP-8	Extended Part
	PCF8563 IDCHIP(英锐芯)	C5795601	PCF8563 1.8V~5.5V Interface:- Voltage - Supply:1.8V~5.5V Voltage - Supply:1.8V~5.5V Current - Supply:- crystal oscillator:- Alarm Output:- Operating Temperature:-20℃~+85℃ Operating Temperature:-20℃~+85℃	SOP-8	Extended Part
	MCP7940NT-E/SN MICROCHIP(美国微芯)	C623888	MCP7940NT-E/SN 1.8V~5.5V I2C Interface:I2C Voltage - Supply:1.8V~5.5V Voltage - Supply:1.8V~5.5V Operating Temperature:-40℃~+125℃ Operating Temperature:-40℃~+125℃	SOIC-8	Extended Part
	RV-3028-C7-32.768kHz-1ppm-TA-QC Micro Crystal(瑞士微晶)	C3019759	RV-3028-C7 32.768kHz 1ppm TA QC 1.1V~5.5V I2C Interface:I2C crystal oscillator:Built-in Alarm Output:Yes Current - Supply:45nA Voltage - Supply:1.1V~5.5V Voltage - Supply:1.1V~5.5V Quiescent Current(Iq):45nA Operating Temperature:-40℃~+85℃ Operating Temperature:-40℃~+85℃ Features:Backup power managem	SMD3215-8P	Extended Part
	PCF8523TK/1,118 NXP(恩智浦)	C2651518	PCF8523TK/1,118 1V~5.5V I2C Interface:I2C Voltage - Supply:1V~5.5V Voltage - Supply:1V~5.5V crystal oscillator:Built-In Alarm Output:Yes Quiescent Current(Iq):150nA	XSON-8-EP(4x4)	Extended Part
	SD3078 WAVE(兴威帆电子)	C916255	SD3078 RTC with built-in crystal; I2C; 2.7V~5.5V; 0.8uA Iq; alarm output; backup power and battery charging; SRAM/NVRAM	SOP-8-208mil	Extended Part

More in Passives & Discretes

Resistor 45 Capacitor 37 Ferrite Bead 10 LED 9 Schottky Diode 8 Mosfet 7 Crystal 5 Power Inductor 5 P Channel Mosfet 4 Dual N Mosfet 2