The Maxim DS1340C-3# is a serial real-time clock/calendar in a 16-pin SOIC package, communicating over an I²C (2-wire) interface. It tracks time in 24-hour HH:MM:SS format and calendar in YY-MM-DD-dd, with automatic leap-year correction. The part includes a trickle-charger for a backup battery, so the clock keeps running through a main-power loss. With a 2.7 V to 5.5 V supply range and industrial temperature rating (-40°C to 85°C), it fits embedded systems that need accurate timekeeping across power cycles — utility meters, industrial controllers, security panels, and data loggers.
DS1340C-3# RTC Clock/Calendar, I²C, 16-SOIC, Industrial Temp
MPNDS1340C-3#
End of Life
Maxim DS1340C-3#, Clock/Calendar RTC, I²C 2-Wire Serial, YY-MM-DD-dd / HH:MM:SS (24 hr), 2.7V-5.5V, 1.3V-3.7V battery backup, -40°C~85°C, 16-SOIC, Tube.
$7.45Ref. price · indicative, final on quote
Packaging16-SOIC (0.295", 7.50mm Width)
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type | Clock/Calendar |
| Mounting | Surface Mount |
| Voltage | 2.7V ~ 5.5V |
| Voltage - supply, battery | 1.3V ~ 3.7V |
| Current - timekeeping | 125µA @ 3.3V |
| Interface | I²C, 2-Wire Serial |
| Operating temperature | -40°C ~ 85°C |
| Package | Tube |
| Features | Leap Year, Trickle-Charger |
| Date format | YY-MM-DD-dd |
| Time format | HH:MM:SS (24 hr) |
| Case | 16-SOIC (0.295\", 7.50mm Width) |
Product details
Frequently asked questions
Does DS1340C-3# support a backup battery?
Yes. It has a dedicated battery-supply pin (1.3 V to 3.7 V) and an integrated trickle-charger, so a 3 V lithium coin cell or rechargeable backup can keep the clock running during main-power loss.
Is DS1340C-3# pin compatible with DS1337?
The DS1337 is a different pinout and feature set — it lacks the trickle-charger and uses a different package option. They are not drop-in replacements. If you need a pin-compatible RTC with trickle-charge, stay with the DS1340C-3# or its direct siblings in the same package.
What is the price of DS1340C-3#?
Pricing depends on quantity and current market conditions. Submit an RFQ for a live quote — the spot price is confirmed at quote time, not listed here.
What is DS1340C-3#'s listed type on this component line?
The device type is Clock/Calendar — a serial real-time clock with full time-of-day and date tracking.