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Equivalent & Substitute Parts for 1337GDVGI8
Part Overview
The 1337GDVGI8 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Renesas Electronics Corporation. This device integrates I2C/2-Wire Serial interface capability with alarm, leap year, and square wave output features in an 8-MSOP surface mount package. The part is currently in active production status with 700 units in stock.
Substitute parts are necessary when the 1337GDVGI8 becomes unavailable, reaches end-of-life, or when design requirements necessitate alternative packaging, supply voltage ranges, or feature sets while maintaining core RTC clock/calendar functionality.
Substiute Parts
Key Parameters
| Parameter | 1337GDVGI8 Specification |
|---|---|
| Manufacturer | Renesas Electronics Corporation |
| Category | Clock/Timing |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Voltage - Supply | 1.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year, Square Wave Output |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the 1337GDVGI8 is determined by the following criteria:
Primary Compatibility Parameters:
- Interface type: I2C, 2-Wire Serial (mandatory match)
- Time format: HH:MM:SS with 12/24 hour capability (mandatory match)
- Date format: YY-MM-DD-dd (mandatory match)
- Operating temperature range: -40°C ~ 85°C (mandatory match)
- Supply voltage overlap: Minimum 1.8V support required
- Mounting type: Surface Mount (mandatory match)
- RoHS compliance: ROHS3 Compliant (mandatory match)
Secondary Compatibility Parameters:
- Package form factor: 8-pin configurations (8-MSOP, 8-TSSOP, 8-SOIC acceptable)
- Features: Alarm and Leap Year support (core requirements)
- Current consumption in timekeeping mode
Substitute parts are grouped into two categories: direct pin-compatible replacements in 8-MSOP/8-TSSOP packages, and functional equivalents in 8-SOIC packages that require PCB layout modification but maintain electrical compatibility.
Parameter Comparison
| Part Number | Manufacturer | Package | Supply Voltage | Interface | Time Format | Date Format | Operating Temp | Features | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| 1337GDVGI8 | Renesas | 8-MSOP (0.118", 3.00mm) | 1.8V ~ 5.5V | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave | Active |
| BU9873FVT-GE2 | Rohm Semiconductor | 8-TSSOP (0.173", 4.40mm) | 1.8V ~ 5.5V | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year | Not For New Designs |
| DS1339BU+T | Analog Devices Inc./Maxim | 8-MSOP (0.118", 3.00mm) | 1.71V ~ 5.5V | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave, Trickle-Charger | Active |
| DS1340U-33+ | Analog Devices Inc./Maxim | 8-MSOP (0.118", 3.00mm) | 2.97V ~ 5.5V | I2C, 2-Wire | HH:MM:SS (24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Leap Year, Trickle-Charger | Active |
| M41T80M6F | STMicroelectronics | 8-SOIC (0.154", 3.90mm) | 2V ~ 5.5V | I2C, 2-Wire | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave | Active |
| M41T81M6F | STMicroelectronics | 8-SOIC (0.154", 3.90mm) | 2V ~ 5.5V | I2C, 2-Wire | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, Square Wave, Watchdog Timer | Active |
| M41T82RM6F | STMicroelectronics | 8-SOIC (0.154", 3.90mm) | 2.7V ~ 5.5V | I2C, 2-Wire | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, SRAM, Watchdog Timer | Active |
| M41T82ZM6F | STMicroelectronics | 8-SOIC (0.154", 3.90mm) | 2.38V ~ 5.5V | I2C, 2-Wire | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Alarm, Leap Year, SRAM, Watchdog Timer | Active |
| DS1338C-3# | Analog Devices Inc./Maxim | 16-SOIC (0.295", 7.50mm) | 2.7V ~ 5.5V | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Leap Year, NVSRAM, Square Wave | Active |
| DS1338Z-18+ | Analog Devices Inc./Maxim | 8-SOIC (0.154", 3.90mm) | 1.71V ~ 5.5V | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Leap Year, NVSRAM, Square Wave | Active |
| DS1338Z-3+ | Analog Devices Inc./Maxim | 8-SOIC (0.154", 3.90mm) | 2.7V ~ 5.5V | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | -40°C ~ 85°C | Leap Year, NVSRAM, Square Wave | Active |
Engineering Selection Recommendations
Direct Pin-Compatible Replacements (8-MSOP Package):
DS1339BU+T is the primary substitute for the 1337GDVGI8. Both devices share identical 8-MSOP packaging (0.118", 3.00mm width), enabling direct PCB footprint compatibility without layout modification. The DS1339BU+T maintains all core functional requirements: I2C interface, 12/24-hour time format, YY-MM-DD-dd date format, -40°C to 85°C operating range, and alarm/leap year features. The supply voltage range (1.71V ~ 5.5V) encompasses the 1337GDVGI8 specification (1.8V ~ 5.5V). Product status is Active with 16,931 units in stock. RoHS3 compliance and REACH unaffected status match the original part.
DS1340U-33+ provides an alternative 8-MSOP solution with Active product status and 1,446 units available. However, this part operates in 24-hour time format only (no 12-hour option) and has a higher minimum supply voltage (2.97V vs. 1.8V), making it suitable only for applications that do not require 12-hour format or operate above 2.97V.
Functional Equivalents (8-SOIC Package):
M41T80M6F, M41T81M6F, M41T82RM6F, and M41T82ZM6F are STMicroelectronics RTC devices in 8-SOIC packaging (0.154", 3.90mm width). These parts require PCB layout modification due to different pin pitch and package geometry but maintain electrical compatibility through I2C interface, time/date format alignment, and -40°C to 85°C operating range. All four variants are in Active product status with inventory availability ranging from 1,506 to 15,989 units.
M41T80M6F operates at 2V ~ 5.5V supply voltage and includes alarm, leap year, and square wave output features. M41T81M6F adds watchdog timer functionality. M41T82RM6F and M41T82ZM6F include SRAM memory (7B) and watchdog timer, with M41T82ZM6F supporting a lower minimum supply voltage (2.38V).
DS1338Z-18+ and DS1338Z-3+ are Analog Devices 8-SOIC alternatives with 56B NVSRAM, leap year, and square wave output. DS1338Z-18+ supports 1.71V ~ 5.5V supply voltage, matching the 1337GDVGI8 low-voltage requirement. DS1338Z-3+ operates at 2.7V ~ 5.5V. Both maintain 12/24-hour time format and YY-MM-DD-dd date format.
DS1338C-3# is a 16-SOIC package variant with 56B NVSRAM. This part requires significant PCB redesign due to 16-pin configuration and is recommended only when additional memory capacity is required.
Not Recommended for New Designs:
BU9873FVT-GE2 (Rohm Semiconductor) carries "Not For New Designs" product status despite meeting core electrical specifications. This designation indicates the manufacturer is discontinuing the product line. Use only for legacy system maintenance or when existing inventory is available.
Frequently Asked Questions (FAQ)
Q: Can DS1340U-33+ replace 1337GDVGI8 in all applications?
A: No. DS1340U-33+ operates in 24-hour time format only and does not support 12-hour format. Additionally, its minimum supply voltage is 2.97V, which exceeds the 1337GDVGI8 specification of 1.8V. Use DS1340U-33+ only in applications that operate above 2.97V and do not require 12-hour time format capability.
Q: What is the difference between 8-MSOP and 8-SOIC packages?
A: 8-MSOP (0.118" width) and 8-SOIC (0.154" width) are both 8-pin surface mount packages but have different pin pitch and body dimensions. 8-MSOP is more compact. Direct footprint substitution is not possible between these packages; PCB layout modification is required for 8-SOIC alternatives.
Q: Do all substitute parts support I2C interface?
A: Yes. All listed substitute parts use I2C/2-Wire Serial interface, maintaining software compatibility with the 1337GDVGI8 at the protocol level. However, verify device-specific I2C address and register map compatibility with your firmware implementation.
Q: Which substitute offers the lowest supply voltage operation?
A: DS1338Z-18+ supports 1.71V ~ 5.5V supply voltage, providing the lowest minimum voltage among substitutes. This part is suitable for ultra-low-power applications requiring operation below 2V.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 Compliant status and REACH Unaffected designation, matching the environmental compliance profile of the 1337GDVGI8.
Q: What is the inventory status of recommended substitutes?
A: DS1339BU+T has the highest availability with 16,931 units in stock. M41T80M6F offers 15,989 units. DS1338Z-18+ provides 50,200 units, the largest inventory among all substitutes. Verify current stock levels with your distributor before design commitment.
Q: Can M41T82RM6F or M41T82ZM6F be used if additional SRAM is needed?
A: Yes. Both M41T82RM6F and M41T82ZM6F include 7B SRAM memory, providing non-volatile storage beyond the 1337GDVGI8 capability. These parts are suitable for applications requiring on-chip data retention. Verify firmware compatibility with the M41T82 register map.
Q: What is the significance of "Trickle-Charger" feature in DS1339BU+T?
A: The trickle-charger feature enables slow charging of a backup battery through an internal resistor network. This is beneficial for maintaining RTC operation during power loss. The 1337GDVGI8 does not specify this feature; verify if your application requires battery backup capability.
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