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DS3232SN#T&R Equivalent & Substitute Parts
Part Overview
The DS3232SN#T&R is a Real Time Clock (RTC) IC with integrated clock/calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This 20-SOIC surface mount device operates across a wide supply voltage range of 2.3V to 5.5V and includes features such as alarm capability, leap year compensation, square wave output, and 236 bytes of SRAM. The device maintains active product status with 10,400 units in current inventory.
Substitute parts are necessary when design requirements demand alternative package configurations, reduced power consumption, different memory architectures, or specific manufacturer certifications. The following equivalent components maintain functional compatibility through I2C/2-Wire Serial interface standardization while offering variations in physical packaging, power characteristics, and integrated features.
Substiute Parts
Key Parameters
| Parameter | DS3232SN#T&R |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Interface | I2C, 2-Wire Serial |
| Voltage - Supply | 2.3V ~ 5.5V |
| Voltage - Supply, Battery | 2.3V ~ 5.5V |
| Current - Timekeeping (Max) | 120µA ~ 160µA @ 3.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Memory Size | 236B |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal |
| RoHS Status | ROHS3 Compliant |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution compatibility is determined by the following critical parameters:
Interface Compatibility: All substitute parts maintain I2C/2-Wire Serial communication protocol, ensuring software and firmware compatibility without modification.
Operating Temperature Range: All candidates support the -40°C to 85°C industrial temperature range, maintaining functional equivalence across thermal conditions.
Supply Voltage Overlap: Substitute parts must support overlapping voltage ranges within the 2.3V to 5.5V envelope or provide battery-backed operation within compatible voltage windows.
Time/Date Format Support: All substitutes maintain HH:MM:SS and YY-MM-DD-dd format capability, with variations in 12/24-hour mode support.
RoHS3 Compliance: All substitute parts maintain ROHS3 compliance status, meeting environmental and regulatory requirements.
Package Variations: Substitutes are grouped by physical package type (8-SOIC, 8-TSSOP, 8-TDFN, 8-MSOP, 28-SOIC), which determines PCB layout compatibility and thermal characteristics.
Memory Architecture: Substitute parts vary in total memory capacity (56B to 1Kb) and SRAM/NVSRAM implementation, affecting data storage capability.
Parameter Comparison
| Part Number | Manufacturer | Package | Supply Voltage | Battery Voltage | Timekeeping Current | Memory Size | Time Format | Features | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| DS3232SN#T&R | Analog Devices/Maxim | 20-SOIC (7.50mm) | 2.3V ~ 5.5V | 2.3V ~ 5.5V | 120µA ~ 160µA @ 3.3V ~ 5.5V | 236B | HH:MM:SS (12/24 hr) | Alarm, Leap Year, Square Wave, SRAM, TCXO/Crystal | ROHS3 |
| ISL12008IB8Z-T | Renesas Electronics | 8-SOIC (3.90mm) | 2.7V ~ 5.5V | 1.8V ~ 5.5V | 4µA ~ 6µA @ 3V ~ 5V | — | HH:MM:SS:hh (24 hr) | Alarm, Leap Year | ROHS3 |
| ISL12058IBZ | Renesas Electronics | 8-SOIC (3.90mm) | 1.8V ~ 3.6V | — | 0.65µA @ 1.8V | — | HH:MM:SS (12/24 hr) | Alarm, Leap Year | ROHS3 |
| M41ST87WMX6TR | STMicroelectronics | 28-SOIC (7.50mm) | 2.7V ~ 3.6V | 2.5V ~ 3.6V | 0.5mA @ 2.7V ~ 3.6V | 128B | HH:MM:SS:hh (24 hr) | Alarm, Leap Year, NVSRAM, Square Wave, Supervisor, Watchdog | ROHS3 |
| M41T56M6F | STMicroelectronics | 8-SOIC (3.90mm) | 4.5V ~ 5.5V | 2.5V ~ 4.6V | 100µA (Typ) @ 4.5V ~ 5.5V | 56B | HH:MM:SS (24 hr) | Leap Year, NVSRAM | ROHS3 |
| MCP7940M-I/SN | Microchip Technology | 8-SOIC (3.90mm) | 1.8V ~ 5.5V | — | 1µA @ 5.5V | 64B | HH:MM:SS (12/24 hr) | Alarm, Leap Year, Square Wave, SRAM | ROHS3 |
| MCP7940M-I/ST | Microchip Technology | 8-TSSOP (4.40mm) | 1.8V ~ 5.5V | — | 1µA @ 5.5V | 64B | HH:MM:SS (12/24 hr) | Alarm, Leap Year, Square Wave, SRAM | ROHS3 |
| MCP7940NT-I/MNY | Microchip Technology | 8-WFDFN Exposed Pad | 1.8V ~ 5.5V | 1.3V ~ 5.5V | 1.2µA @ 3.3V | 64B | HH:MM:SS (12/24 hr) | Alarm, Leap Year, Square Wave, SRAM | ROHS3 |
| MCP79410-I/MS | Microchip Technology | 8-MSOP (3.00mm) | 1.8V ~ 5.5V | 1.3V ~ 5.5V | 1.2µA @ 3.3V | 64B, 1Kb | HH:MM:SS (12/24 hr) | Alarm, Leap Year, Square Wave, SRAM, Unique ID | ROHS3 |
| MCP79410-I/SN | Microchip Technology | 8-SOIC (3.90mm) | 1.8V ~ 5.5V | 1.3V ~ 5.5V | 1.2µA @ 3.3V | 64B, 1Kb | HH:MM:SS (12/24 hr) | Alarm, Leap Year, Square Wave, SRAM, Unique ID | ROHS3 |
Engineering Selection Recommendations
For Direct Package Compatibility (20-SOIC): No substitute maintains the 20-SOIC package form factor. The M41ST87WMX6TR provides the closest package footprint at 28-SOIC with identical 7.50mm width, though this requires PCB layout modification.
For Compact Form Factor Designs: The 8-SOIC, 8-TSSOP, 8-TDFN, and 8-MSOP packages reduce board space requirements. ISL12008IB8Z-T, MCP7940M-I/SN, MCP7940M-I/ST, MCP7940NT-I/MNY, MCP79410-I/MS, and MCP79410-I/SN all provide 8-pin configurations with I2C interface compatibility.
For Extended Supply Voltage Range: MCP7940 series (MCP7940M-I/SN, MCP7940M-I/ST, MCP7940NT-I/MNY) and MCP79410 series support 1.8V to 5.5V supply range, exceeding the DS3232SN#T&R lower limit of 2.3V.
For Ultra-Low Power Operation: ISL12058IBZ delivers 0.65µA timekeeping current at 1.8V, significantly lower than the DS3232SN#T&R specification of 120µA–160µA. This device operates within 1.8V to 3.6V range and is suitable for battery-powered applications with extended runtime requirements.
For Automotive Applications: MCP7940NT-I/MNY carries AEC-Q100 qualification and automotive grade designation, meeting automotive reliability standards.
For Enhanced Feature Set: M41ST87WMX6TR integrates supervisor and watchdog timer functions beyond basic RTC capability, with 128B NVSRAM memory. MCP79410 series includes unique ID functionality and expanded 1Kb memory capacity.
For Regulatory Compliance: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the DS3232SN#T&R environmental certifications.
Frequently Asked Questions (FAQ)
Q: Can I directly replace DS3232SN#T&R with an 8-SOIC package substitute without PCB modification?
A: No. The DS3232SN#T&R uses a 20-SOIC package with 20 pins. All 8-pin substitutes require PCB layout redesign. Pin assignments differ between packages, and not all DS3232SN#T&R pins have functional equivalents in smaller packages. Verify pinout compatibility and feature requirements before design migration.
Q: Which substitute offers the lowest power consumption?
A: ISL12058IBZ delivers 0.65µA timekeeping current at 1.8V, the lowest among all listed substitutes. However, this device operates only within 1.8V to 3.6V supply range and lacks battery backup voltage specification. For applications requiring extended supply voltage range with low power, MCP7940 and MCP79410 series offer 1µA to 1.2µA timekeeping current across 1.8V to 5.5V operation.
Q: Are all substitutes I2C compatible with DS3232SN#T&R firmware?
A: All substitutes use I2C/2-Wire Serial interface protocol. However, register maps, command structures, and feature implementations differ between manufacturers. Firmware modifications are required to accommodate manufacturer-specific register definitions and operational sequences. Direct code compatibility is not guaranteed.
Q: What is the difference between SRAM and NVSRAM in these RTC devices?
A: SRAM (Static RAM) loses data during power loss unless battery-backed. NVSRAM (Non-Volatile Static RAM) retains data through power cycles without battery backup. DS3232SN#T&R uses battery-backed SRAM. M41ST87WMX6TR uses NVSRAM, providing data retention without continuous battery power. Select based on data persistence requirements during power interruption.
Q: Can I use MCP79410-I/SN as a drop-in replacement for DS3232SN#T&R?
A: No. MCP79410-I/SN uses 8-SOIC package versus DS3232SN#T&R's 20-SOIC. Pin count, pinout, and feature set differ significantly. This requires complete PCB redesign and firmware rewrite. However, both devices support I2C interface, 12/24-hour time format, and alarm functionality, making functional migration possible with engineering effort.
Q: Which substitute is best for battery-backed operation?
A: MCP7940NT-I/MNY supports battery voltage range of 1.3V to 5.5V with 1.2µA timekeeping current at 3.3V, providing extended battery life. ISL12008IB8Z-T supports battery voltage from 1.8V to 5.5V with 4µA to 6µA current. Both are suitable for battery-backed applications. MCP79410 series also supports 1.3V to 5.5V battery range.
Q: Does package size affect I2C communication reliability?
A: I2C communication protocol remains identical across all package types. However, smaller packages (8-SOIC, 8-TSSOP, 8-TDFN, 8-MSOP) may present different PCB layout constraints affecting trace routing, impedance matching, and noise immunity. Larger packages (20-SOIC, 28-SOIC) provide more pins for power distribution and ground connections, potentially improving signal integrity in high-noise environments.
Q: Are there temperature rating differences between substitutes?
A: All listed substitutes maintain -40°C to 85°C operating temperature range, matching DS3232SN#T&R specifications. No temperature rating advantages exist among the substitute options.
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