MCP7940N-I/MS Microchip Undefined or Miscellaneous (Small Outline Packages) In Stock

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

MCP7940N-I/MS is a low-power I2C real-time clock/calendar with 64 bytes of SRAM, battery switchover, and alarm outputs, housed in an 8-pin MSOP package. It operates from 1.8 V to 5.5 V at up to 400 kHz, making it ideal for embedded systems requiring accurate timekeeping with minimal board space.

ACTIVEUndefined or MiscellaneousVerified Jun 2026

Package / Visual Reference

MCP7940N-I/MSSmall Outline Packages

Quick Facts

Manufacturer: Microchip
Package: Small Outline Packages
Pin Count: 8
Lifecycle: ACTIVE
Datasheet: MCP7940N-I/MS Datasheet PDF
Category: Undefined or Miscellaneous
Price: From $0.7750(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/MS?

I2C interface up to 400 kHz for easy integration
Operating voltage 1.8 V to 5.5 V wide range
64 bytes battery-backed SRAM for user data retention
Two alarm outputs with configurable interrupt modes
Battery switchover circuitry for uninterrupted timekeeping
8-pin MSOP package for compact PCB layouts

What is MCP7940N-I/MS used for?

The MCP7940N-I/MS is widely used in industrial and consumer equipment where accurate timekeeping is critical, such as data loggers, smart meters, and HVAC controllers. Its I2C interface and low-voltage operation make it suitable for microcontroller-based systems with tight power budgets. The device also fits into portable medical instruments and IoT gateways that require reliable clock and calendar functions with minimal power draw.

What are the specifications of MCP7940N-I/MS?

Manufacturer Package Code	MSOP-8
Factory Lead Time	12Weeks
YTEOL	13
Clock Frequency-Max	0.032MHz
Information Access Method	SERIAL(I2C)
Interrupt Capability	Y
JESD-30 Code	S-PDSO-G8
JESD-609 Code	e3
On Chip Data RAM Width	8
Package Body Material	PLASTIC/EPOXY
Package Equivalence Code	SOP8,.19
Package Shape	SQUARE
Package Style	SMALL OUTLINE
Qualification Status	Not Qualified
RAM (words)	64
Screening Level	TS 16949
Supply Current-Max	0.4mA
Supply Voltage-Max	5.5V
Supply Voltage-Min	1.8V
Supply Voltage-Nom	2.5V
Surface Mount	YES
Technology	CMOS
Temperature Grade	INDUSTRIAL
Terminal Finish	Matte Tin (Sn)
Terminal Form	GULL WING
Terminal Pitch	0.65mm
Terminal Position	DUAL
Time-Min	SECONDS
Volatile	YES
uPs/uCs/Peripheral ICs Type	TIMER, REAL TIME CLOCK
## MCP7940N-I/MS Alternates Showing results	Image
Package	Small Outline 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/MS datasheet?

MCP7940N-I/MS Datasheet Download

Official datasheet from Microchip

What are equivalent replacements for MCP7940N-I/MS?

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

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MCP79400-I/SNMicrochip Technology Inc

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MCP79402-I/SNMicrochip Technology Inc

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Frequently Asked Questions

What is the operating voltage range of the MCP7940N-I/MS and how does it affect battery backup design?

The MCP7940N-I/MS operates from 1.8 V to 5.5 V, and its internal battery switchover circuit automatically switches to a backup supply when the main power drops below the switchover voltage threshold, ensuring the 64-byte SRAM and clock registers retain data without interruption.

How fast is the I2C bus supported by MCP7940N-I/MS for real-time communication?

The MCP7940N-I/MS supports I2C clock speeds up to 400 kHz in Fast mode, enabling rapid read/write cycles for timekeeping registers and the 64-byte SRAM within a standard 8-pin MSOP footprint.

Which embedded applications benefit most from the MCP7940N-I/MS alarm output feature?

Industrial data loggers, smart energy meters, and HVAC schedulers benefit from the MCP7940N-I/MS dual alarm outputs, which can trigger interrupts at specific calendar times or repeating intervals, reducing host CPU polling overhead in systems running at 3.3 V or 5 V.

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Reference Price (USD)

From $0.7750

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Qty.	Unit Price	Ext. Price
1+	$0.8682	$0.87
25+	$0.8260	$20.65
1500+	$0.7950	$1192.50
2000+	$0.7900	$1580.00
2500+	$0.7750	$1937.50

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Unit price: $0.8682 · Total: $0.87

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Lead Time3-7 business days

MOQFrom 1 piece

ShippingDHL / FedEx / UPS

OriginChina (Authorized)

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MCP7940N-I/MS Microchip Undefined or Miscellaneous (Small Outline Packages) In Stock

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

What is MCP7940N-I/MS used for?

What are the specifications of MCP7940N-I/MS?

Compliance & Regulatory

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

What are equivalent replacements for MCP7940N-I/MS?

Frequently Asked Questions

What is the operating voltage range of the MCP7940N-I/MS and how does it affect battery backup design?

How fast is the I2C bus supported by MCP7940N-I/MS for real-time communication?

Which embedded applications benefit most from the MCP7940N-I/MS alarm output feature?

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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