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PT7C4337BWEX Equivalent & Substitute Parts
Part Overview
The PT7C4337BWEX is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by Diodes Incorporated. It features I2C/2-Wire Serial interface, alarm capability, leap year support, and square wave output in an 8-SOIC surface mount package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support.
Substiute Parts
Key Parameters
| Parameter | PT7C4337BWEX |
|---|---|
| Manufacturer | Diodes Incorporated |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year, Square Wave Output |
| Voltage Supply | 1.8V ~ 5.5V |
| Current - Timekeeping (Max) | 0.8µA @ 1.2V ~ 1.8V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the PT7C4337BWEX is determined by the following critical parameters:
Primary Substitution Criteria:
- Interface: I2C, 2-Wire Serial (mandatory match)
- Time Format: HH:MM:SS with 12/24 hour support
- Date Format: YY-MM-DD-dd
- Features: Alarm, Leap Year capability
- Operating Temperature: -40°C ~ 85°C
- RoHS3 Compliance
Secondary Considerations:
- Voltage Supply Range: 1.8V ~ 5.5V preferred for direct compatibility
- Package Type: Surface mount preferred; through-hole alternatives acceptable with PCB redesign
- Current Consumption: Lower timekeeping current preferred for battery-backed applications
- Product Status: Active status preferred for long-term availability
Substitutes are grouped into two categories: direct replacements (same manufacturer, active status) and functional equivalents (alternative manufacturers, compatible electrical specifications).
Parameter Comparison
| Parameter | PT7C4337BWEX | PT7C4337WEX | AB-RTCMC-32.768KHZ-AIGZ-S7-T | BU9873FVT-GE2 | DS1307N+ | DS1308U-33+ | DS1338U-33+T&R | DS1339BU+T | DS1339U-33+ | DS1341T+ | ISL12020MIRZ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Diodes Inc. | Diodes Inc. | Abracon LLC | Rohm Semi. | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Renesas |
| Product Status | Obsolete | Active | Active | Not For New Designs | Active | Active | Active | Active | Active | Active | Active |
| Interface | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire |
| Time Format | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS:hh (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 |
| Features | Alarm, Leap Year, Square Wave | Alarm, Leap Year, Square Wave | Alarm, Leap Year, Watchdog | Alarm, Leap Year | Leap Year, NVSRAM, Square Wave | Leap Year, NVSRAM, Square Wave | Leap Year, NVSRAM, Square Wave | Alarm, Leap Year, Square Wave, Trickle-Charger | Alarm, Leap Year, Square Wave, Trickle-Charger | Alarm, Leap Year, Square Wave | Alarm, Daylight Savings, Leap Year, SRAM |
| Voltage Supply | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1V ~ 4.4V | 1.8V ~ 5.5V | 4.5V ~ 5.5V | 3V ~ 5.5V | 3V ~ 5.5V | 1.71V ~ 5.5V | 2.97V ~ 5.5V | 1.8V ~ 5.5V | 2.7V ~ 5.5V |
| Current - Timekeeping (Max) | 0.8µA @ 1.2V ~ 1.8V | 0.8µA @ 1.3V ~ 1.8V | 0.4µA ~ 0.95µA @ 1V ~ 4.4V | 1µA ~ 1.35µA @ 3V ~ 5.5V | 200µA @ 5V | 125µA ~ 200µA @ 3V ~ 5.5V | 125µA ~ 200µA @ 3.63V ~ 5.5V | 200µA @ 1.71V ~ 5.5V | 200µA @ 5.5V | 0.5µA ~ 0.6µA @ 3V ~ 5V | 14µA ~ 15µA @ 3V ~ 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 |
| Package / Case | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-WCDFN | 8-TSSOP (0.173", 4.40mm) | 8-DIP (0.300", 7.62mm) | 8-TSSOP, 8-MSOP (0.118", 3.00mm) | 8-TSSOP, 8-MSOP (0.118", 3.00mm) | 8-TSSOP, 8-MSOP (0.118", 3.00mm) | 8-TSSOP, 8-MSOP (0.118", 3.00mm) | 8-WDFN Exposed Pad | 20-PowerLFDFN |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Through Hole | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| 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
Tier 1 - Direct Replacement (Recommended):
PT7C4337WEX is the primary substitute. Manufactured by Diodes Incorporated with active product status, it maintains identical electrical specifications, time/date formats, feature set, and 8-SOIC package footprint. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel), which does not affect circuit functionality. This part requires no PCB redesign.
Tier 2 - Functional Equivalents (Surface Mount, Active Status):
DS1341T+ offers the lowest timekeeping current (0.5µA ~ 0.6µA) with identical voltage supply range and feature compatibility. Package change from 8-SOIC to 8-WDFN requires PCB layout modification but maintains surface mount compatibility.
DS1339BU+T and DS1339U-33+ provide extended voltage supply range (1.71V ~ 2.97V minimum) with trickle-charger functionality. Both use 8-TSSOP/8-MSOP packages requiring PCB redesign.
AB-RTCMC-32.768KHZ-AIGZ-S7-T (Abracon) offers the lowest timekeeping current (0.4µA ~ 0.95µA) and extended voltage range (1V ~ 4.4V). Package is 8-WCDFN, requiring PCB layout modification.
Tier 3 - Alternative Architectures (Active Status):
DS1307N+ and DS1308U-33+ include 56B NVSRAM memory. DS1307N+ uses through-hole 8-DIP package (requires PCB redesign for surface mount applications). DS1308U-33+ uses surface mount 8-TSSOP/8-MSOP.
ISL12020MIRZ (Renesas) provides 128B SRAM, daylight savings support, and 20-pin package. Higher timekeeping current (14µA ~ 15µA) and larger footprint require significant PCB redesign.
Tier 4 - Legacy Status (Not Recommended for New Designs):
BU9873FVT-GE2 carries "Not For New Designs" status despite active inventory. Use only for legacy system maintenance where no other substitute is feasible.
Frequently Asked Questions (FAQ)
Q: Can PT7C4337WEX directly replace PT7C4337BWEX without PCB changes?
A: Yes. PT7C4337WEX is electrically and mechanically identical, with the same 8-SOIC footprint. Only packaging format differs (Cut Tape & Digi-Reel vs. Tape & Reel), which affects supply chain logistics, not circuit design.
Q: What is the key difference between PT7C4337BWEX and DS1341T+?
A: Both support I2C interface, 12/24-hour time format, and alarm/leap year features. DS1341T+ has lower timekeeping current (0.5µA ~ 0.6µA vs. 0.8µA) and uses 8-WDFN package instead of 8-SOIC, requiring PCB layout modification.
Q: Why is DS1307N+ listed as a substitute if it uses through-hole packaging?
A: DS1307N+ is functionally compatible but requires PCB redesign for surface mount applications. It is listed for reference in legacy or mixed-technology designs where through-hole components are acceptable.
Q: Does AB-RTCMC-32.768KHZ-AIGZ-S7-T require firmware changes?
A: No. The I2C interface, time/date formats, and core RTC functionality are compatible. The 8-WCDFN package requires PCB layout modification only.
Q: What is the advantage of ISL12020MIRZ over PT7C4337BWEX?
A: ISL12020MIRZ provides 128B SRAM (vs. no memory in PT7C4337BWEX) and daylight savings support. However, it uses a 20-pin package with higher timekeeping current (14µA ~ 15µA), requiring significant PCB redesign. Use only if additional memory and daylight savings features are required.
Q: Is BU9873FVT-GE2 suitable for new product designs?
A: No. BU9873FVT-GE2 carries "Not For New Designs" status. Use only for legacy system maintenance or repair where no other substitute is available.
Q: What is the minimum voltage supply for battery-backed operation?
A: PT7C4337BWEX operates at 1.8V minimum. DS1339BU+T extends this to 1.71V. AB-RTCMC-32.768KHZ-AIGZ-S7-T supports 1V minimum, offering the widest battery compatibility range.
Q: Do all substitutes support the same alarm functionality?
A: All listed substitutes support alarm capability except DS1307N+, DS1308U-33+, and DS1338U-33+T&R, which do not list alarm as a feature. Verify alarm requirements before selection.
Q: What packaging considerations apply when switching from 8-SOIC to 8-TSSOP?
A: 8-TSSOP (0.173", 4.40mm width) is slightly wider than 8-SOIC (0.154", 3.90mm width). PCB footprint, trace routing, and component spacing must be re-evaluated. Pin pitch remains compatible at 0.65mm.
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