BU4838G-TR

Supervisors Overview

The BU4838G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for supervisory circuit applications. It features a fixed under-voltage detection threshold of 3.8 V with a precision of ±1%. The device operates within a supply voltage range of 0.7 V to 7 V and supports an open-drain output type. It functions without manual reset or watchdog timer capabilities. The component is housed in an SSOP-5 package and maintains low power consumption, with a typical operating current of 550 nA and static current of 500 nA at Vdet=4.8V. It is rated for industrial temperatures from -40°C to +125°C.

Supervisors Feature Summary

• CMOS technology ensures low power consumption suitable for battery-operated systems.
• Fixed 3.8 V threshold provides precise monitoring for standard logic supply rails.
• Open-drain output allows flexible interfacing with various digital logic families.

Supervisors Applications

• Microprocessor system reset circuits
• Portable electronic device power management
• Battery-powered equipment supervision

Supervisors Procurement Notes

Verify the NRND (Not Recommended for New Designs) status before procurement, as this indicates the component is being phased out. Confirm that existing inventory meets long-term support requirements. Ensure the SSOP-5 package footprint matches the design layout. Check RoHS compliance documentation for specific regional regulatory needs. Validate that the fixed 3.8 V threshold aligns with the target application's voltage specifications.

Supervisors Selection Notes

Select this component when a fixed 3.8 V detection point is required for single-input voltage monitoring. The open-drain output is suitable for systems needing wired-OR connections or level shifting. Consider the low standby current for energy-efficient designs. Verify that the absence of a watchdog timer does not conflict with system safety requirements. Ensure the operating temperature range covers the intended environmental conditions.

Supervisors Part Context

The BU4838G-TR belongs to the BU4838G series of standard voltage detectors from ROHM. It shares functional similarities with other members like the BU4836G and BU4839G, differing primarily in their fixed detection thresholds. This specific variant targets applications requiring a 3.8 V trip point. It is part of ROHM's broader portfolio of PMIC supervisory circuits designed for compact SMD packages.

Supervisors Replacement Considerations

The BD5238G-1 is listed as a similar level replacement with comparable specifications. Verify pinout compatibility and electrical parameters before substitution. Note that the BU4838F is a discontinued predecessor with different packaging.