Product Configuration System Real Time Clock Modules - Serial (3 Wire & 4 Wire) RX4571SA : 0 B Base Model Pkg. Frequency Tolerance: RTC4574NB SON 22 PIN RTC4574NB B=5+/23PPM RX4045NB SON 22 PIN RX4045NB AA=5+/5PPM RX4045SA SOP 14 PIN RX4045SA AA=5+/5PPM RX4574LC VSOJ 12 PIN RX4574LC B=5+/23PPM RX4575LC VSOJ 12 PIN RX4575LC B=5+/23PPM RX4571LC VSOJ 12 PIN RX4571LC B=5+/23PPM RX4571NB SON 22 PIN RX4571NB B=5+/23PPM RX4571SA SOP 14 PIN RX4571SA B=5+/23PPM RX4801SA SOP 14 PIN RX4801SA UB=+/5PPM : PURE SN Tape & Reel Qty SOP Package Type Only Blank: Bulk 0: 1000 pcs. per reel 3: 250 pcs. per reel DIP Package Type Only S: 25pcs/Stick PURE SN Blank : Already RoHS Compliant Note: All LC packages are already RoHS Compliant with "PURE SN"