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PT7C4307WEX Equivalent & Substitute Parts
Part Overview
The PT7C4307WEX is a Real Time Clock (RTC) IC Clock/Calendar with 56B memory, I2C 2-Wire Serial interface, manufactured by Diodes Incorporated in 8-SOIC packaging. This device provides timekeeping functionality with alarm capability, leap year support, NVSRAM, and square wave output. The product is currently obsolete, making equivalent substitute parts necessary for new designs, production continuity, and system upgrades where the original component is no longer available.
Substiute Parts
Key Parameters
| Parameter | PT7C4307WEX |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Type | Clock/Calendar |
| Memory Size | 56B |
| Interface | I2C, 2-Wire Serial |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Voltage - Supply | 4.5V ~ 5.5V |
| Voltage - Supply, Battery | 2V ~ 4.6V |
| Operating Temperature | -40°C ~ 85°C |
| Features | Alarm, Leap Year, NVSRAM, Square Wave Output |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the PT7C4307WEX is determined by the following critical parameters:
Primary Substitution Criteria:
- Interface: I2C, 2-Wire Serial (mandatory match)
- Time Format: HH:MM:SS (12/24 hr) (mandatory match)
- Date Format: YY-MM-DD-dd (mandatory match)
- Operating Temperature: -40°C ~ 85°C (mandatory match)
- Mounting Type: Surface Mount (mandatory match)
- RoHS Status: ROHS3 Compliant (mandatory match)
Secondary Compatibility Parameters:
- Memory Size: 56B (preferred but not absolute)
- Features: Alarm, Leap Year, Square Wave Output (core functionality)
- Voltage Supply Range: 4.5V ~ 5.5V (system dependent)
- Package Type: 8-SOIC preferred for direct PCB compatibility
Substitute parts are grouped into two categories:
Category A - Direct Package Compatibility (8-SOIC): DS1307ZN+T&R maintains the same 8-SOIC package footprint, enabling direct PCB replacement with minimal layout changes.
Category B - Functional Equivalence (Alternative Packages): DS1337U+, DS1338U-33+, DS1339AU+, DS1339U-2+T&R, DS1339U-33+, DS3231SN#, ISL12020MIRZ-T7A, ISL12026AIVZ, and ISL12058IRTZ-T provide equivalent RTC functionality with I2C interface and required time/date formats but in different packages (8-TSSOP, 8-TDFN, 16-SOIC, 20-DFN). These require PCB redesign or adapter solutions.
Parameter Comparison
| Parameter | PT7C4307WEX | DS1307ZN+T&R | DS1337U+ | DS1338U-33+ | DS1339AU+ | DS1339U-2+T&R | DS1339U-33+ | DS3231SN# | ISL12020MIRZ-T7A | ISL12026AIVZ | ISL12058IRTZ-T |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Diodes Inc. | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Renesas | Renesas | Renesas |
| Package / Case | 8-SOIC | 8-SOIC | 8-TSSOP/MSOP | 8-TSSOP/MSOP | 8-TSSOP/MSOP | 8-TSSOP/MSOP | 8-TSSOP/MSOP | 16-SOIC | 20-PowerLFDFN | 8-TSSOP | 8-WDFN |
| Type | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar |
| Memory Size | 56B | 56B | — | 56B | — | — | — | — | 128B | — | — |
| Interface | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial |
| Time Format | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 1.8V ~ 5.5V | 3V ~ 5.5V | 1.71V ~ 5.5V | 1.8V ~ 5.5V | 2.97V ~ 5.5V | 2.3V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 1.8V ~ 3.6V |
| Voltage - Supply, Battery | 2V ~ 4.6V | 2V ~ 4.6V | — | 1.3V ~ 3.7V | 1.3V ~ 3.7V | 1.3V ~ 3.7V | 1.3V ~ 3.7V | 2.3V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | — |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | Alarm, Leap Year, NVSRAM, Square Wave Output | Leap Year, NVSRAM, Square Wave Output | Alarm, Leap Year, Square Wave Output | Leap Year, NVSRAM, Square Wave Output | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Alarm, Leap Year, Square Wave Output, TCXO/Crystal | Alarm, Daylight Savings, Leap Year, SRAM | Alarm, Leap Year | Alarm, Leap Year |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
DS1307ZN+T&R is the primary substitute for direct PCB replacement. It maintains identical 8-SOIC packaging, matching voltage supply range (4.5V ~ 5.5V), battery backup range (2V ~ 4.6V), and operating temperature (-40°C ~ 85°C). Memory size is 56B with NVSRAM support. Product status is active with ROHS3 compliance. The only functional difference is the absence of alarm capability in the DS1307ZN+T&R; if alarm functionality is critical to system operation, alternative parts must be selected.
DS1337U+, DS1338U-33+, DS1339AU+, DS1339U-2+T&R, DS1339U-33+ are functionally equivalent alternatives from Analog Devices/Maxim Integrated. These devices provide I2C interface, 12/24-hour time format, and YY-MM-DD-dd date format with active product status and ROHS3 compliance. Package changes to 8-TSSOP/MSOP require PCB redesign. DS1337U+ offers extended voltage supply range (1.8V ~ 5.5V) and ultra-low timekeeping current (0.6µA @ 1.3V ~ 1.8V). DS1338U-33+ and DS1339 variants include alarm and trickle-charger features. Voltage supply ranges vary; DS1339U-33+ operates at 2.97V ~ 5.5V, requiring verification against 4.5V ~ 5.5V system requirements.
DS3231SN# provides enhanced accuracy with TCXO/Crystal feature in 16-SOIC package. Voltage supply range (2.3V ~ 5.5V) accommodates the original 4.5V ~ 5.5V requirement. Active product status and ROHS3 compliance confirmed. Package change to 16-SOIC requires significant PCB layout modification.
ISL12020MIRZ-T7A, ISL12026AIVZ, ISL12058IRTZ-T from Renesas Electronics Corporation are active alternatives with ROHS3 compliance. ISL12020MIRZ-T7A offers 128B memory (expanded from 56B) in 20-PowerLFDFN package with daylight savings feature. ISL12026AIVZ and ISL12058IRTZ-T provide compact 8-pin packages (8-TSSOP and 8-WDFN respectively) with ultra-low timekeeping current. ISL12058IRTZ-T operates at reduced voltage range (1.8V ~ 3.6V), incompatible with 4.5V ~ 5.5V supply requirement.
All substitute parts maintain ROHS3 compliance and -40°C ~ 85°C operating temperature range. Product status is active for all alternatives, ensuring long-term availability and supply chain stability.
Frequently Asked Questions (FAQ)
Q: Can DS1307ZN+T&R be used as a direct replacement for PT7C4307WEX?
A: DS1307ZN+T&R is the closest substitute with identical 8-SOIC package, matching voltage supply (4.5V ~ 5.5V), battery backup (2V ~ 4.6V), and operating temperature (-40°C ~ 85°C). Both devices support I2C interface, 56B memory with NVSRAM, and square wave output. The primary difference is that DS1307ZN+T&R does not include alarm functionality. If alarm capability is required, alternative parts must be evaluated.
Q: What is the impact of package changes when selecting substitute parts?
A: Package changes from 8-SOIC to 8-TSSOP, 8-WDFN, 16-SOIC, or 20-DFN require PCB redesign, including footprint modification, trace routing adjustments, and potential layer stack changes. Pin pitch, thermal characteristics, and board space requirements differ significantly. Direct PCB replacement is not possible without adapter solutions or complete layout revision.
Q: Are all substitute parts RoHS3 compliant?
A: Yes, all listed substitute parts are ROHS3 compliant, matching the original PT7C4307WEX compliance status. This ensures compatibility with environmental regulations and procurement standards.
Q: Which substitute part offers the lowest power consumption?
A: ISL12058IRTZ-T provides the lowest timekeeping current at 0.65µA @ 1.8V. However, this device operates at reduced voltage range (1.8V ~ 3.6V), incompatible with systems requiring 4.5V ~ 5.5V supply. For 4.5V ~ 5.5V systems, DS1337U+ offers 0.6µA @ 1.3V ~ 1.8V, and ISL12026AIVZ provides 10µA ~ 20µA @ 2.7V ~ 5.5V.
Q: Can substitute parts with different voltage supply ranges be used in 4.5V ~ 5.5V systems?
A: Substitute parts must operate within the system's supply voltage range. DS1307ZN+T&R (4.5V ~ 5.5V), DS1337U+ (1.8V ~ 5.5V), DS1338U-33+ (3V ~ 5.5V), DS1339AU+ (1.71V ~ 5.5V), DS1339U-2+T&R (1.8V ~ 5.5V), DS1339U-33+ (2.97V ~ 5.5V), DS3231SN# (2.3V ~ 5.5V), ISL12020MIRZ-T7A (2.7V ~ 5.5V), and ISL12026AIVZ (2.7V ~ 5.5V) are compatible. ISL12058IRTZ-T (1.8V ~ 3.6V) is not suitable for 4.5V ~ 5.5V systems.
Q: Do all substitute parts support 12/24-hour time format and YY-MM-DD-dd date format?
A: Yes, all listed substitute parts support HH:MM:SS (12/24 hr) time format and YY-MM-DD-dd date format, matching the original PT7C4307WEX specifications.
Q: What is the difference between NVSRAM and standard SRAM in RTC devices?
A: NVSRAM (Non-Volatile Static RAM) retains data during power loss, providing persistent storage for user data. Standard SRAM loses data when power is removed. PT7C4307WEX includes NVSRAM with 56B capacity. DS1307ZN+T&R and DS1338U-33+ also provide 56B NVSRAM. ISL12020MIRZ-T7A offers 128B SRAM. Devices without specified memory (DS1337U+, DS1339 variants, DS3231SN#, ISL12026AIVZ, ISL12058IRTZ-T) do not include user-accessible non-volatile memory.
Q: Which substitute parts include alarm functionality?
A: DS1337U+, DS1339AU+, DS1339U-2+T&R, DS1339U-33+, DS3231SN#, ISL12020MIRZ-T7A, ISL12026AIVZ, and ISL12058IRTZ-T include alarm features. DS1307ZN+T&R and DS1338U-33+ do not support alarm functionality.
Q: Are substitute parts available in tape and reel packaging for automated assembly?
A: DS1307ZN+T&R is available in Cut Tape (CT) & Digi-Reel packaging. DS1339U-2+T&R and ISL12020MIRZ-T7A are available in Tape & Reel (TR) packaging. Other parts are available in Tube packaging. Packaging selection depends on production volume and assembly process requirements.
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