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1338D-31DVGI8
Renesas Electronics Corporation
1338D-31 REAL TIME CLOCK
2265 Pcs New Original In Stock
Real Time Clock (RTC) IC Clock/Calendar 56B I2C 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
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5.0 / 5.0
- (65 Ratings)
1338D-31DVGI8
Product Overview
11206436
DiGi Electronics Part Number
1338D-31DVGI8-DGManufacturer
Renesas Electronics Corporation
1338D-31DVGI8
Description
1338D-31 REAL TIME CLOCKInventory
2265 Pcs New Original In Stock
Real Time Clock (RTC) IC Clock/Calendar 56B I2C 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Quantity
Minimum 1
Minimum 1
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1338D-31DVGI8 Technical Specifications
Category
Clock/Timing, Real Time Clocks
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Type
Clock/Calendar
Features
Leap Year, RAM, Square Wave Output
Memory Size
56B
Time Format
HH:MM:SS (12/24 hr)
Date Format
YY-MM-DD-dd
Interface
I2C
Voltage - Supply
3.3V ~ 5.5V
Voltage - Supply, Battery
1.3V ~ 3.7V
Current - Timekeeping (Max)
2µA @ 3.63V
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package
8-TSSOP
Datasheet & Documents
HTML Datasheet
1338D-31DVGI8-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
800-1338D-31DVGI8TR
Standard Package
2,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Toller Service, der auch bei besonderen Anliegen stets professionell reagiert.
Dec 02, 2025
Ich bin begeistert von der schnellen Verfügbarkeit der Produkte bei DiGi Electronics. Das Lager ist immer gut bestückt, was den Einkauf extrem bequem macht.
Dec 02, 2025
Der Support nach dem Verkauf war sehr hilfreich, ich erhielt zügige Unterstützung bei technischen Problemen.
Dec 02, 2025
Their commitment to excellence in both product quality and delivery timeliness is admirable.
Dec 02, 2025
DiGi Electronics consistently provides competitive prices, making it easier to expand my collection without overspending.
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Frequently Asked Questions (FAQ)
Can the 1338D-31DVGI8 real-time clock maintain accurate timekeeping during a power outage, and what battery backup considerations should I account for in my design?
Yes, the 1338D-31DVGI8 supports battery-backed operation with a supply voltage range of 1.3V to 3.7V for the VBAT pin, allowing it to maintain time and calendar data during main power loss. However, ensure your backup battery (e.g., a 3V coin cell like CR2032) is connected directly to VBAT with minimal trace resistance and no series diodes that could drop voltage below 1.3V under load. Also, avoid placing high-capacitance loads on VBAT, as inrush current during power-up can stress the battery. Use a low-leakage Schottky diode or ideal diode controller on VCC if isolating main and backup power to prevent backfeeding.
How does the 1338D-31DVGI8 compare to the DS3231MZ+ for precision timing in industrial applications, and when should I choose one over the other?
The 1338D-31DVGI8 is a cost-effective RTC with ±5 ppm typical accuracy over -40°C to 85°C, suitable for general-purpose applications, while the DS3231MZ+ integrates a temperature-compensated crystal oscillator (TCXO) for ±2 ppm accuracy, making it better for high-precision timing. Choose the 1338D-31DVGI8 when power consumption and BOM cost are critical and ±5 ppm drift is acceptable (e.g., consumer electronics). Opt for the DS3231MZ+ in mission-critical systems like smart meters or data loggers where long-term time accuracy is paramount, despite its higher cost and slightly larger footprint.
What are the risks of using the 1338D-31DVGI8 in a high-humidity environment, and how does its MSL 3 rating affect PCB assembly and storage?
The 1338D-31DVGI8 has an MSL 3 (Moisture Sensitivity Level 3) rating, meaning it can be exposed to ambient conditions for up to 168 hours after dry packaging is opened before reflow soldering. In high-humidity environments, prolonged exposure beyond this window can cause moisture absorption, leading to 'popcorning' during reflow. To mitigate risk, store unused parts in a dry cabinet (<10% RH) and bake them at 125°C for 24 hours if exposed longer than 168 hours. Additionally, ensure conformal coating is applied in final assembly if the end product operates in humid or condensing conditions to protect the 8-TSSOP package from corrosion.
Can I replace a PCF8563T in an existing design with the 1338D-31DVGI8 without firmware changes, and what integration challenges might arise?
While both the 1338D-31DVGI8 and PCF8563T are I2C-based RTCs, direct replacement is not recommended without firmware validation. The 1338D-31DVGI8 uses a different register map, time format (supports both 12/24-hour modes natively), and includes additional features like a square wave output and 56 bytes of RAM—none of which are pin- or register-compatible with the PCF8563T. You’ll need to update your I2C driver to handle new register addresses and initialization sequences. Also, verify interrupt polarity and timing, as the alarm and timer functions differ in implementation, which could affect wake-up logic in low-power systems.
What design precautions should I take when routing the I2C lines to the 1338D-31DVGI8 in a noisy industrial environment to ensure reliable communication?
In electrically noisy environments, improper I2C routing to the 1338D-31DVGI8 can lead to communication errors or missed interrupts. Use short, symmetric traces for SDA and SCL with controlled impedance if possible, and route them away from high-speed digital lines or power converters. Include pull-up resistors (typically 4.7kΩ for 3.3V systems) close to the 1338D-31DVGI8, and consider using I2C buffers or isolators (e.g., PCA9517) if the bus extends beyond 1 meter or crosses ground domains. Additionally, enable clock stretching in your host controller if using low-power modes, as the 1338D-31DVGI8 may briefly hold SCL low during time updates to prevent data corruption.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
1338D-31DVGI8 CAD Models
Renesas Electronics Corporation 1338D-31DVGI8 PCB symbols & footprints
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