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STMicroelectronics M48T37Y-70MH1F — DC-DC Power Modules

M48T37Y-70MH1F Timekeeper RTC, Parallel, 44-SOH, Active

MPNM48T37Y-70MH1F
End of Life

STMicroelectronics Timekeeper® M48T37Y-70MH1F, Clock/Calendar RTC, Parallel interface, YY-MM-DD-dd date, HH:MM:SS (24 hr) time, 4.5V~5.5V supply, 0°C~70°C, 44-SOH package, requires SNAPHAT.

$21.11Ref. price · indicative, final on quote
STMicroelectronics M48T37Y-70MH1F datasheet (PDF)
Packaging44-BSOP (0.337", 8.56mm Width) requires SNAPHAT
RoHSROHS3 Compliant
SeriesTimekeeper®
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

M48T37Y-70MH1F specifications
ParameterValue
TypeClock/Calendar
SeriesTimekeeper®
MountingSurface Mount
Voltage4.5V ~ 5.5V
Current - timekeeping3mA @ 4.5V ~ 5.5V
InterfaceParallel
Operating temperature0°C ~ 70°C
PackageTape & Reel (TR); Cut Tape (CT)
FeaturesAlarm, Leap Year, Watchdog Timer
Date formatYY-MM-DD-dd
Time formatHH:MM:SS (24 hr)
Case44-BSOP (0.337\", 8.56mm Width) requires SNAPHAT

Product details

The STMicroelectronics M48T37Y-70MH1F is a Timekeeper® real-time clock/calendar with a parallel interface, delivering timekeeping in YY-MM-DD-dd date and HH:MM:SS (24 hr) format.

Package reality — the SNAPHAT requirement

This part is supplied in a surface-mount package that requires a SNAPHAT battery holder (sold separately). The SNAPHAT snaps onto the top of the SOIC-like body and contains the lithium cell that keeps the clock running when main power is off.

Timekeeping current and supply planning

Timekeeping current is 3 mA maximum at 4.5 V to 5.5 V.

Frequently asked questions

Does M48T37Y-70MH1F require a SNAPHAT battery?

Yes. The 44-BSOP package is designed to accept a SNAPHAT battery holder (sold separately) that contains the lithium backup cell. Without the SNAPHAT, the RTC loses timekeeping when main power is removed.

What is the closest pin-compatible alternative to M48T37Y-70MH1F?

Within the Timekeeper family, other 44-SOH RTCs with the same parallel interface and SNAPHAT footprint exist, but STMicroelectronics does not list a direct pin-compatible second source from another manufacturer. Verify register compatibility against your specific firmware before substituting.