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S-35390A: The Low-Power Timekeeper That Just Works

The S-35390A from ABLIC is a real-time clock (RTC) chip that takes power saving seriously. With standby currents in the nanoamp range, it’s built for long-haul battery-powered devices. Perfect for IoT sensors, portable loggers, or smart meters—basically anything that needs to keep time without draining the battery.

It runs over I²C, works across a wide 2.4V to 5.5V range, and handles industrial-grade temps from -40°C to 85°C. Stable, compatible, and quietly reliable.

Its biggest strength? Ultra-low power consumption. This chip just sips power, ticks away in the background, and doesn’t demand attention. Set it up once, and it quietly keeps time for years.

Functional Block Diagram of S-35390A RTC

Alternative Options

If S-35390A is out of stock or you’re comparing options, here are a few solid alternatives:

BQ32000 – From TI, similar function, has power-switching support, slightly higher power use

PCF8523 – From NXP, with more alarm/timer features, a bit more complex

PT7C4337 – Well-balanced in features and cost, easy drop-in replacement

AM1805 – Packed with extras like watchdog and voltage monitor

M41T00M6F – A classic from ST, stable and compatible

All are capable RTCs, and the best choice depends on your exact needs. But for ultra-low power, the S-35390A is tough to beat.

Where It Fits Best

S-35390A is a great fit for:

  • Battery-powered sensors and data loggers
  • Industrial meters and remote monitoring systems
  • Smart utility meters and wearables
  • Any low-maintenance device that needs to keep time quietly and reliably

It’s especially handy when you want your device to just work—without needing to babysit the RTC or worry about power consumption.

Final Thoughts

The S-35390A doesn’t try to impress with flashy features. It sticks to what matters: keeping time accurately, with minimal power draw, and staying rock solid in tough conditions. It’s the kind of chip you install and forget—because it just does its job.

If your project values power efficiency and reliability, this one definitely earns a spot on your parts list.

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