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PT7C4337BUEX Equivalent & Substitute Parts
Part Overview
The PT7C4337BUEX is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Diodes Incorporated. This device operates as a 2-Wire Serial I2C interface component in an 8-TSSOP package and provides timekeeping with alarm, leap year, and square wave output capabilities. The product is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and new production requirements.
Substiute Parts
Key Parameters
| Parameter | PT7C4337BUEX |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Interface | I2C, 2-Wire Serial |
| Voltage - Supply | 1.8V ~ 5.5V |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year, Square Wave Output |
| Operating Temperature | -40°C ~ 85°C |
| Current - Timekeeping (Max) | 0.8µA @ 1.2V ~ 1.8V |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the PT7C4337BUEX is determined by the following critical parameters:
Primary Compatibility Criteria:
- Interface type: I2C, 2-Wire Serial
- Time format: HH:MM:SS (12/24 hr)
- Date format: YY-MM-DD-dd
- Operating temperature range: -40°C ~ 85°C
- RoHS3 compliance
Package Compatibility: The original part uses 8-TSSOP (8-MSOP) packaging. Substitutes may use alternative 8-pin packages (8-SOIC, 8-uMAX) provided the pinout and electrical characteristics remain compatible with I2C operation.
Voltage Supply Range: The PT7C4337BUEX operates from 1.8V to 5.5V. Substitute parts must support overlapping or equivalent voltage ranges to ensure system compatibility.
Feature Set: Core features (Alarm, Leap Year, Square Wave Output) must be present in substitute parts. Additional features such as SRAM, Trickle-Charger, or Watchdog Timer do not disqualify a part but represent enhanced functionality.
Parameter Comparison
| Part Number | Manufacturer | Package | Interface | Voltage Supply | Time Format | Date Format | Operating Temp | Features | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| PT7C4337BUEX | Diodes Inc. | 8-TSSOP | I2C, 2-Wire | 1.8V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave | Obsolete |
| 1339-31DVGI8 | Renesas Electronics | 8-TSSOP | I2C, 2-Wire | 3.3V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave, Trickle-Charger | Active |
| DS1339AU+T | Analog Devices/Maxim | 8-TSSOP | I2C, 2-Wire | 1.71V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave, Trickle-Charger | Active |
| BU9873F-GTE2 | Rohm Semiconductor | 8-SOIC | I2C, 2-Wire | 1.8V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year | Not For New Designs |
| DS1307Z+ | Analog Devices/Maxim | 8-SOIC | I2C, 2-Wire | 4.5V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | 0°C ~ 70°C | Leap Year, NVSRAM, Square Wave | Active |
| DS1337C# | Analog Devices/Maxim | 16-SOIC | I2C, 2-Wire | 1.8V ~ 5.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave | Active |
| DS3232MZ+TRL | Analog Devices/Maxim | 8-SOIC | I2C, 2-Wire | 2.3V ~ 4.5V | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave, SRAM | Active |
| M41ST87WMX6TR | STMicroelectronics | 28-SOIC | I2C, 2-Wire | 2.7V ~ 3.6V | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, NVSRAM, Square Wave, Supervisor, Watchdog | Active |
| AB-RTCMC-32.768KHZ-IBO5-S3-T | Abracon LLC | Module | I2C, 2-Wire | 1.5V ~ 3.6V | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Square Wave, SRAM, Trickle Charge, Watchdog | Not For New Designs |
Engineering Selection Recommendations
Direct Pin-Compatible Substitutes (8-TSSOP Package):
The DS1339AU+T and 1339-31DVGI8 are the closest functional equivalents to the PT7C4337BUEX. Both maintain the 8-TSSOP package form factor, support the full voltage range overlap (1.71V ~ 5.5V and 3.3V ~ 5.5V respectively), and provide identical time/date formats with required alarm and leap year functionality. Both parts are in active production status with ROHS3 compliance.
Alternative Package Substitutes (8-SOIC):
The BU9873F-GTE2 and DS3232MZ+TRL offer functional equivalence with different packaging. The BU9873F-GTE2 matches the voltage range (1.8V ~ 5.5V) and feature set but is marked "Not For New Designs." The DS3232MZ+TRL is actively produced but operates within a narrower voltage range (2.3V ~ 4.5V) and includes additional SRAM memory.
Larger Package Alternatives:
The DS1337C# (16-SOIC) and M41ST87WMX6TR (28-SOIC) provide full functional compatibility with identical time/date formats and operating temperature ranges. These parts are suitable for applications where PCB space permits larger packages. The M41ST87WMX6TR includes enhanced features (NVSRAM, Supervisor, Watchdog Timer) but operates within a narrower voltage range (2.7V ~ 3.6V).
Product Status Consideration:
For new designs and long-term production, prioritize parts with "Active" product status: DS1339AU+T, 1339-31DVGI8, DS1307Z+, DS1337C#, DS3232MZ+TRL, and M41ST87WMX6TR. Avoid parts marked "Not For New Designs" unless legacy system support is required.
Frequently Asked Questions (FAQ)
Q: Can I directly replace PT7C4337BUEX with DS1339AU+T without PCB modifications?
A: The DS1339AU+T uses the same 8-TSSOP package and I2C interface. Pinout compatibility must be verified against the specific datasheet, as pin assignments may differ between manufacturers. Electrical characteristics (voltage supply, current consumption) are compatible.
Q: What is the key difference between 8-TSSOP and 8-SOIC packages?
A: Both are 8-pin surface mount packages but differ in physical dimensions and thermal characteristics. 8-TSSOP (0.118" width) is narrower than 8-SOIC (0.173" width). PCB footprints are not interchangeable without layout redesign.
Q: Why does DS1307Z+ have a narrower operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C)?
A: The DS1307Z+ is specified for 0°C ~ 70°C operation. Applications requiring -40°C ~ 85°C operation must select alternatives such as DS1339AU+T, DS1337C#, or DS3232MZ+TRL.
Q: Is the 1339-31DVGI8 suitable for applications requiring 1.8V operation?
A: No. The 1339-31DVGI8 operates from 3.3V ~ 5.5V. For 1.8V operation, select DS1339AU+T (1.71V ~ 5.5V) or BU9873F-GTE2 (1.8V ~ 5.5V).
Q: What does "Not For New Designs" mean for BU9873F-GTE2 and AB-RTCMC-32.768KHZ-IBO5-S3-T?
A: This designation indicates the manufacturer is not recommending these parts for new product development. They may have limited availability or planned discontinuation. Use only for legacy system maintenance or when no active alternatives meet specific requirements.
Q: Can I use M41ST87WMX6TR as a drop-in replacement?
A: The M41ST87WMX6TR is functionally compatible but uses a 28-SOIC package instead of 8-TSSOP, requiring PCB redesign. It operates within 2.7V ~ 3.6V, which may not cover the full 1.8V ~ 5.5V range of the original part.
Q: What is the significance of ROHS3 compliance for all listed parts?
A: ROHS3 compliance confirms all parts meet Restriction of Hazardous Substances regulations. All listed substitutes maintain this compliance, ensuring regulatory compatibility with the original PT7C4337BUEX.
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