AB1805 · AM1805 → RV-1805-C3
Cross-reference / replacement · Abracon · Ambiq → Micro Crystal
- Interface:
- I²C (400 kHz)
- Time-keeping Current:
- ~60 nA typ
- Crystal:
- Integrated 32.768 kHz
- Features:
- Alarm, timer, WDT, trickle charge
Compatibility & sourcing notes
AB1805, AM1805, and RV-1805-C3 are all built on the same Ambiq AM18x5 ultra-low-power RTC core with an identical register map and I²C/SPI command set (one driver serves all three), so firmware ports unchanged. They are not a pin/footprint drop-in, however: the RV-1805-C3 uses Micro Crystal’s own small module package versus Abracon/Ambiq’s 16-VFQFN, so a re-layout is required. Note: the RV-1805-C3 is NRND — for new designs consider the RV-3028-C7.
Registers and interface are similar and firmware largely ports, but the package/pinout differs — re-layout and validate in your design.
Frequently asked questions
Can RV-1805-C3 replace the AB1805 · AM1805? ▾
AB1805, AM1805, and RV-1805-C3 are all built on the same Ambiq AM18x5 ultra-low-power RTC core with an identical register map and I²C/SPI command set (one driver serves all three), so firmware ports unchanged. They are not a pin/footprint drop-in, however: the RV-1805-C3 uses Micro Crystal’s own small module package versus Abracon/Ambiq’s 16-VFQFN, so a re-layout is required. Note: the RV-1805-C3 is NRND — for new designs consider the RV-3028-C7.
What should I check when replacing the AB1805 · AM1805? ▾
Registers and interface are similar and firmware largely ports, but the package/pinout differs — re-layout and validate in your design.
Is the RV-1805-C3 in stock, and can I get a quote? ▾
JLink Technology is an authorized distributor and supplies RV-1805-C3 with stock, pricing, and lead time. Click "Request a Quote" with your quantity and we reply within one business day.