MCP7940N-I/P Microchip Integrated Circuit (Dual-In-Line Packages) In Stock

Name: MCP7940N-I/P
Brand: Microchip
SKU: MCP7940N-I/P
Availability: InStock

MCP7940N-I/P is an I2C real-time clock and calendar IC with 64-byte SRAM from Microchip in an 8-pin PDIP package. It uses a 32.768 kHz crystal and communicates over I2C serial interface with interrupt output support. Available Pb-free in stock worldwide for datalogging, appliance, and embedded timekeeping designs.

ACTIVEIntegrated CircuitVerified Jun 2026

Package / Visual Reference

MCP7940N-I/PDual-In-Line Packages

Quick Facts

Manufacturer: Microchip
Package: Dual-In-Line Packages
Pin Count: 8
Lifecycle: ACTIVE
Datasheet: MCP7940N-I/P Datasheet PDF
Category: Integrated Circuit
Price: From $0.7400(MOQ 1)
Temp Range: -40.0°C to 85.0°C
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of MCP7940N-I/P?

I2C serial interface at up to 400 kHz (Fast-mode) for direct connection to microcontrollers without additional logic, supporting multi-device bus sharing
64 bytes of battery-backed SRAM for storing calibration constants or event logs while the main supply is off
14-year YTEOL commitment and 8-week factory lead time supporting long-lifecycle industrial and appliance programs in familiar 8-pin PDIP package

What is MCP7940N-I/P used for?

MCP7940N-I/P provides accurate timekeeping in embedded systems such as data loggers, industrial controllers, and home appliances that require a real-time clock with calendar and alarm capability. Its 64-byte SRAM allows small parameter tables or event records to persist through power cycling when backed by a coin cell. The 8-pin PDIP package enables rapid prototyping and through-hole assembly for low-volume production runs or development boards.

What are the specifications of MCP7940N-I/P?

Manufacturer Package Code	PDIP-8
Factory Lead Time	8Weeks
YTEOL	14
Clock Frequency-Max	0.032MHz
Information Access Method	SERIAL(I2C)
Interrupt Capability	Y
JESD-30 Code	R-PDIP-T8
JESD-609 Code	e3
On Chip Data RAM Width	8
Package Body Material	PLASTIC/EPOXY
Package Equivalence Code	DIP8,.3
Package Shape	RECTANGULAR
Package Style	IN-LINE
Qualification Status	Not Qualified
RAM (words)	64
Screening Level	AEC-Q100
Supply Current-Max	0.4mA
Supply Voltage-Max	5.5V
Supply Voltage-Min	1.8V
Supply Voltage-Nom	2.5V
Surface Mount	NO
Technology	CMOS
Temperature Grade	INDUSTRIAL
Terminal Finish	Matte Tin (Sn)
Terminal Form	THROUGH-HOLE
Terminal Pitch	2.54mm
Terminal Position	DUAL
Time-Min	SECONDS
Volatile	YES
uPs/uCs/Peripheral ICs Type	TIMER, REAL TIME CLOCK
Package	Dual-In-Line Packages

Compliance & Regulatory

RoHS Status	Compliant
Lead-Free	Yes (Pb-Free)
ECCN	EAR99
HTS Code	8542.39.00.01
Country of Origin	Thailand

Where can I find the MCP7940N-I/P datasheet?

MCP7940N-I/P Datasheet Download

Official datasheet from Microchip

What are equivalent replacements for MCP7940N-I/P?

Compatible alternatives and drop-in replacements for MCP7940N-I/P:

MCP7940M-I/PMicrochip Technology Inc

RTCC with SRAM (no battery backing)

View Part →

Compare all alternatives & request quotes →

Frequently Asked Questions

What serial interface does MCP7940N-I/P use, and at what maximum clock frequency can it communicate?

MCP7940N-I/P communicates over I2C at a maximum clock frequency of 400 kHz (Fast-mode I2C), compatible with most 3.3 V and 5 V microcontrollers including AVR, PIC, and ARM Cortex-M families. The 2-wire I2C interface requires only SCL and SDA lines plus pull-up resistors, minimizing the number of GPIO pins consumed by the RTC in pin-limited embedded designs.

How much on-chip RAM does MCP7940N-I/P include, and what data can be stored there during power loss?

MCP7940N-I/P includes 64 bytes of general-purpose SRAM with 8-bit data width. When a backup battery is connected, this SRAM retains its contents through main supply failures, allowing storage of small configuration tables, calibration offsets, or the last 16 timestamped event records in 4-byte entries. This eliminates a separate external EEPROM for many low-data-volume logging applications.

For a 14-year lifecycle industrial timer using MCP7940N-I/P, what crystal frequency is required externally?

MCP7940N-I/P requires an external 32.768 kHz crystal oscillator connected to its XTAL1 and XTAL2 pins for timekeeping. A standard 32.768 kHz tuning-fork crystal with 7 pF load capacitance and plus or minus 20 ppm accuracy is sufficient for most calendar applications, yielding a timekeeping error of less than 1 minute per month. The 14-year YTEOL rating ensures the IC remains available in production throughout a long industrial product program.

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AvailabilityIn Stock

Reference Price (USD)

From $0.7400

Buy from 1pc · Factory-direct pricing

Qty.	Unit Price	Ext. Price
1+	$0.9100	$0.91
50+	$0.8620	$43.10
69+	$0.8325	$57.44
100+	$0.8100	$81.00
1000+	$0.7700	$770.00
5000+	$0.7400	$3700.00

pcs

Unit price: $0.9100 · Total: $0.91

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Lead Time3-7 business days

MOQFrom 1 piece

ShippingDHL / FedEx / UPS

OriginChina (Authorized)

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MCP7940N-I/P Microchip Integrated Circuit (Dual-In-Line Packages) In Stock

What are the key features of MCP7940N-I/P?

What is MCP7940N-I/P used for?

What are the specifications of MCP7940N-I/P?

Compliance & Regulatory

Where can I find the MCP7940N-I/P datasheet?

What are equivalent replacements for MCP7940N-I/P?

Frequently Asked Questions

What serial interface does MCP7940N-I/P use, and at what maximum clock frequency can it communicate?

How much on-chip RAM does MCP7940N-I/P include, and what data can be stored there during power loss?

For a 14-year lifecycle industrial timer using MCP7940N-I/P, what crystal frequency is required externally?

Related Guides

CSD87313DMS Synchronous Buck Power Stage Design Guide

STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection

C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC

STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security

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About Microchip

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