Microchip Technology MCP7940N-E/MS

Mfr. Part

MCP7940N-E/MS

Manufacturer

Micrel / Microchip Technology. Y-IC is a quality, reliable distributor for this brand and we will provide you with the best genuine products and responsive service.

Detailed Description

Automotive AEC‑Q100 qualified real‑time clock/calendar IC with I2C (2‑wire) interface, dual‑supply battery‑backup input, alarms, square‑wave output, and 64‑byte SRAM. Operates from 1.8V to 5.5V (main supply) with backup battery input from 1.3V to 5.5V. Small 8‑lead MSOP surface‑mount package. Wide operating temperature −40°C to +125°C. RoHS3 compliant.

Key Features

RTC clock/calendar with leap‑year compensation

Time format: 12‑hour or 24‑hour (HH:MM:SS)

Date format: YY‑MM‑DD‑dd (year, month, day, day‑of‑week)

I2C (2‑wire) serial interface, standard RTC register map

Two alarms and programmable square‑wave output (MFP pin)

64 bytes of SRAM for user data

Battery‑backup input (VBAT) with automatic switchover

Automotive AEC‑Q100 qualified series

Wide supply range: 1.8V to 5.5V (VCC), 1.3V to 5.5V (VBAT)

Low timekeeping current for long backup life (see datasheet)

Surface‑mount 8‑MSOP package, RoHS3 compliant

Key Advantages

Reliable timekeeping across power loss thanks to VBAT backup

Wide voltage and temperature ranges suit harsh automotive and industrial use

Very low backup current extends battery life

Small footprint (8‑MSOP) saves board space

Simple 2‑wire I2C control integrates easily with MCUs

On‑chip alarms and square‑wave reduce external components

AEC‑Q100 qualification supports automotive design and PPAP needs

Packaging

Type: Tube (standard shipping for small‑outline ICs)

Device package/case: 8‑MSOP (0.118 in / 3.00 mm body width); Supplier Device Package: 8‑MSOP

Mounting: Surface‑mount (SMT)

Materials: Molded epoxy package with leadframe; matte‑tin plated leads; RoHS3 lead‑free

Size/footprint: JEDEC MSOP‑8 outline (compact 3 mm body width)

Pin configuration (8 pins): SCL, SDA, VCC, GND, VBAT (backup supply), MFP (alarm/square‑wave output), X1, X2 (32.768 kHz crystal pins)

Thermal characteristics: Low‑power device; heat generation is minimal in normal use. For exact θJA/θJC and thermal limits, refer to the datasheet and your PCB layout.

Electrical properties (high‑level): VCC 1.8–5.5 V; VBAT 1.3–5.5 V; I2C interface; backup timekeeping current is very low (see datasheet). Note: the line item “1.2A @ 3.3V” appears to be a unit typo; timekeeping current is typically in the microamp range—please verify in the datasheet.

Lifecycle

Status: Active and in ongoing production within Microchip’s Automotive (AEC‑Q100) series

Discontinuation: Not near end‑of‑life based on current public information

Equivalent/Alternative models (verify pinout, features, and specifications before substitution):

- Microchip MCP7940N‑I/MS (industrial grade, similar core RTC)

- Microchip MCP79410 (RTC with integrated 1 Kbit EEPROM and unique ID)

- Microchip MCP79411 / MCP79412 (RTC variants with ID/other features)

- NXP PCF8523 (I2C RTC, 1.8–5.5 V)

- NXP PCF85063A/TP (low‑power I2C RTC)

- Maxim DS1337 / DS1338 (I2C RTCs; check voltage range)

- Maxim DS1307 (5 V only; functional alternative, not drop‑in)

- Maxim DS3231 (I2C RTC with TCXO; higher accuracy, different specs)

- Epson RX‑8010SJ (I2C RTC; check package/pinout)

If you need pin‑compatible or drop‑in alternatives, please contact our Y‑IC sales team via our website for the latest cross‑references and availability.

Key Application Areas

Automotive electronics: dashboards, body control modules, infotainment, telematics

Industrial control and logging: PLCs, data loggers, event/time stamping

IoT and smart devices: gateways, sensors, low‑power edge nodes

Utility and metering: tamper/event stamps, scheduled tasks

Consumer and office equipment: printers, copiers, set‑top boxes

Networking and communications: routers, switches, base stations

Security and access control: panels, DVR/NVR, time‑stamped records

Datasheet

Y‑IC hosts the most authoritative, up‑to‑date datasheet for MCP7940N‑E/MS on our product page. We strongly recommend downloading it here to verify electrical specs, timing, crystal selection, and thermal data before design‑in.

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