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RX-4801SA:UB PURE SN EPSON 14-SOIC (0.197, 5.00mm Width) 14 Terminations 3V Real Time Clocks Alarm market price
MCP7940MT-I/MNY Microchip Technology 8-WFDFN Exposed Pad 8 Terminations 2.5V 8 Pin MCP7940M Real Time Clocks Alarm, Leap Year, Square Wave Output, SRAM market price
M48T08-100PC1 STMicroelectronics 28-DIP Module (0.600, 15.24mm) 28 Terminations 5V 28 Pin M48T08 Real Time Clocks Leap Year, Watchdog Timer 41.889657
M41T56C64MY6F STMicroelectronics 18-SOX, 18-SOIC with Crystal (7.5mm Width) 18 Terminations 5V 18 Pin M41T56 Real Time Clocks EEPROM, Leap Year, NVSRAM 0.032MHz 4.687191
X1226V8 Xicor TSSOP 8 Terminations 5V Real Time Clocks 0.032MHz market price
MCP795W22T-I/SL Microchip Technology 14-SOIC (0.154, 3.90mm Width) 14 Terminations 5V 14 Pin MCP795W22 Real Time Clocks Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer 10MHz Min 1.8 V V Max 5.5 V V market price
X1228V14-2.7A Intersil (Renesas Electronics America) TSSOP 14 Terminations 5V 14 Pin Real Time Clocks 0.032MHz market price
M41T82SM6F STMicroelectronics 8-SOIC (0.154, 3.90mm Width) 8 Terminations 5V 8 Pin M41T82 Real Time Clocks Alarm, Leap Year, SRAM, Watchdog Timer 0.4MHz market price
DS1685E3+T Maxim Integrated - 24 Terminations 3V 24 Pin Real Time Clocks 0.032MHz market price
IDT1339C-31SRI8 Integrated Device Technology (IDT) SOIC Real Time Clocks market price
M41T83ZQA6F STMicroelectronics 16-VQFN Exposed Pad 16 Terminations 3V 16 Pin M41T83 Real Time Clocks Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 0.4MHz 4.774831
IDT1337GNLGI Integrated Device Technology (IDT) QFN Real Time Clocks market price
PT7C4337BLEX Diodes Incorporated 8-TSSOP (0.173, 4.40mm Width) Real Time Clocks Alarm, Leap Year, Square Wave Output market price
PCF2123U/5GA/1,015 NXP USA Inc. - 12 Terminations 2V Real Time Clocks 0.032MHz market price
RTC-4553A2 EPSON 14-SOIC (0.209, 5.30mm Width) Real Time Clocks Leap Year, SRAM market price
DS1338U-33+T&R/C01 Maxim Integrated UMAX Real Time Clocks market price
M48T201Y-70MH1F STMicroelectronics 44-BSOP (0.337, 8.56mm Width) requires SNAPHAT 44 Terminations 5V 44 Pin M48T201 Real Time Clocks Alarm, Leap Year, Square Wave Output, Supervisor, Watchdog Timer, Y2K 18.735645
RA-8565SA:B PURE SN EPSON 14-SOIC (0.197, 5.00mm Width) Real Time Clocks Alarm market price
RTC-62423A:3 EPSON 24-SOIC (0.311, 7.90mm Width) Real Time Clocks Leap Year market price
M48T201V-85MH1F STMicroelectronics 44-BSOP (0.337, 8.56mm Width) requires SNAPHAT 44 Terminations 3.3V 44 Pin M48T201 Real Time Clocks Alarm, Leap Year, Square Wave Output, Supervisor, Watchdog Timer, Y2K 34.276662
ISL12059IBZ Renesas Electronics America Inc. 8-SOIC (0.154, 3.90mm Width) ISL12059 Real Time Clocks Leap Year market price
X1227S8Z-2.7A Renesas Electronics America Inc. 8-SOIC (0.154, 3.90mm Width) X1227 Real Time Clocks Alarm, Leap Year, Supervisor, Watchdog Timer market price
DS1743P-100 Rochester Electronics, LLC 34-PowerCap™ Module 34 Terminations 5V 34 Pin Real Time Clocks Leap Year, NVSRAM, Y2K 0.032MHz market price
BQ3285EDSSTR Texas Instruments SSOP 24 Terminations 5V 24 Pin Real Time Clocks 0.032MHz market price
DS1384FP-12+ Maxim Integrated 44-QFP 44 Terminations 5V 44 Pin DS1384 Real Time Clocks Alarm, Leap Year, Square Wave Output, Watchdog Timer 0.032MHz market price
Someone has searched this part IC Chips and others have searched some relevant parts as the following:
RX-4801SA:UB PURE SN
：
EPSON
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14-SOIC (0.197, 5.00mm Width)
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NO
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14 Terminations 3V Real Time Clocks Alarm
MCP7940MT-I/MNY
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Microchip Technology
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8-WFDFN Exposed Pad
：
NO
：
8 Terminations 2.5V 8 Pin MCP7940M Real Time Clocks Alarm, Leap Year, Square Wave Output, SRAM
M48T08-100PC1
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STMicroelectronics
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28-DIP Module (0.600, 15.24mm)
：
NO
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28 Terminations 5V 28 Pin M48T08 Real Time Clocks Leap Year, Watchdog Timer
M41T56C64MY6F
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STMicroelectronics
：
18-SOX, 18-SOIC with Crystal (7.5mm Width)
：
NO
：
18 Terminations 5V 18 Pin M41T56 Real Time Clocks EEPROM, Leap Year, NVSRAM 0.032MHz
X1226V8
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Xicor
：
TSSOP
：
NO
：
8 Terminations 5V Real Time Clocks 0.032MHz
MCP795W22T-I/SL
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Microchip Technology
：
14-SOIC (0.154, 3.90mm Width)
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NO
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14 Terminations 5V 14 Pin MCP795W22 Real Time Clocks Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer 10MHz Min 1.8 V V Max 5.5 V V
X1228V14-2.7A
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Intersil (Renesas Electronics America)
：
TSSOP
：
NO
：
14 Terminations 5V 14 Pin Real Time Clocks 0.032MHz
M41T82SM6F
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STMicroelectronics
：
8-SOIC (0.154, 3.90mm Width)
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NO
：
8 Terminations 5V 8 Pin M41T82 Real Time Clocks Alarm, Leap Year, SRAM, Watchdog Timer 0.4MHz
DS1685E3+T
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Maxim Integrated
：
-
：
NO
：
24 Terminations 3V 24 Pin Real Time Clocks 0.032MHz
IDT1339C-31SRI8
：
Integrated Device Technology (IDT)
：
SOIC
：
NO
：
Real Time Clocks
M41T83ZQA6F
：
STMicroelectronics
：
16-VQFN Exposed Pad
：
NO
：
16 Terminations 3V 16 Pin M41T83 Real Time Clocks Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 0.4MHz
IDT1337GNLGI
：
Integrated Device Technology (IDT)
：
QFN
：
NO
：
Real Time Clocks
PT7C4337BLEX
：
Diodes Incorporated
：
8-TSSOP (0.173, 4.40mm Width)
：
NO
：
Real Time Clocks Alarm, Leap Year, Square Wave Output
PCF2123U/5GA/1,015
：
NXP USA Inc.
：
-
：
NO
：
12 Terminations 2V Real Time Clocks 0.032MHz
RTC-4553A2
：
EPSON
：
14-SOIC (0.209, 5.30mm Width)
：
NO
：
Real Time Clocks Leap Year, SRAM
DS1338U-33+T&R/C01
：
Maxim Integrated
：
UMAX
：
NO
：
Real Time Clocks
M48T201Y-70MH1F
：
STMicroelectronics
：
44-BSOP (0.337, 8.56mm Width) requires SNAPHAT
：
NO
：
44 Terminations 5V 44 Pin M48T201 Real Time Clocks Alarm, Leap Year, Square Wave Output, Supervisor, Watchdog Timer, Y2K
RA-8565SA:B PURE SN
：
EPSON
：
14-SOIC (0.197, 5.00mm Width)
：
NO
：
Real Time Clocks Alarm
RTC-62423A:3
：
EPSON
：
24-SOIC (0.311, 7.90mm Width)
：
NO
：
Real Time Clocks Leap Year
M48T201V-85MH1F
：
STMicroelectronics
：
44-BSOP (0.337, 8.56mm Width) requires SNAPHAT
：
NO
：
44 Terminations 3.3V 44 Pin M48T201 Real Time Clocks Alarm, Leap Year, Square Wave Output, Supervisor, Watchdog Timer, Y2K
ISL12059IBZ
：
Renesas Electronics America Inc.
：
8-SOIC (0.154, 3.90mm Width)
：
NO
：
ISL12059 Real Time Clocks Leap Year
X1227S8Z-2.7A
：
Renesas Electronics America Inc.
：
8-SOIC (0.154, 3.90mm Width)
：
NO
：
X1227 Real Time Clocks Alarm, Leap Year, Supervisor, Watchdog Timer
DS1743P-100
：
Rochester Electronics, LLC
：
34-PowerCap™ Module
：
NO
：
34 Terminations 5V 34 Pin Real Time Clocks Leap Year, NVSRAM, Y2K 0.032MHz
BQ3285EDSSTR
：
Texas Instruments
：
SSOP
：
NO
：
24 Terminations 5V 24 Pin Real Time Clocks 0.032MHz
DS1384FP-12+
：
Maxim Integrated
：
44-QFP
：
NO
：
44 Terminations 5V 44 Pin DS1384 Real Time Clocks Alarm, Leap Year, Square Wave Output, Watchdog Timer 0.032MHz

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