BU45K322G-TL

Overview

The BU45K322G-TL is a fixed delay type voltage detector manufactured by ROHM Semiconductor. It features an under-voltage detection voltage of 3.2V with a precision of ±1%. The reset active voltage range spans from 0.6V to 6V, utilizing an open drain output type. The device incorporates a fixed reset delay timer of 200ms and maintains a low reset active state. Operating circuit current is 2.3μA in the ON state and 2.8μA in the OFF state. Hysteresis voltage is defined as VDET multiplied by 0.05. The component supports an L output current of 2mA at low voltage and 8.5mA at high voltage. It operates within a temperature range of -40°C to 105°C and is housed in an SSOP-3 package.

Feature Summary

• Fixed delay timer functionality providing a consistent 200ms reset delay for stable system recovery.
• Open drain output configuration allowing flexible interfacing with various logic levels.
• Low power consumption design suitable for battery-operated applications with minimal standby current draw.

Applications

• Portable electronic devices requiring reliable power supply monitoring
• Embedded systems needing fixed delay reset sequences
• Battery-powered equipment with low quiescent current requirements

Procurement Notes

Verify the obsolete status and NRND classification before procurement. Confirm availability through authorized channels as production may be limited. Ensure compatibility with existing PCB layouts using the SSOP-3 package. Check for RoHS compliance documentation if required for specific regulatory standards. Validate that the fixed delay characteristic meets system timing requirements without modification.

Selection Notes

Select this component when a fixed 200ms delay is mandatory rather than adjustable. Consider the open drain output for level shifting needs. Evaluate the 3.2V threshold against system operating voltages. Compare power consumption metrics with newer alternatives if long-term supply is critical. Assess thermal performance within the specified -40°C to 105°C range for the intended environment.

Part Context

This part belongs to the BU45/BU46 series of voltage detectors from ROHM Semiconductor. It shares functional similarities with other models in the family but differs in specific detection thresholds and package options. The BU45K322G-TL represents a legacy product line often replaced by newer generations like the BD52xx series for new designs.

Replacement Considerations

BD5232G-1 is listed as a similar specification replacement with recommended status for new designs. Note differences in package (SSOP5 vs SSOP3) and adjustable delay features. Verify pinout compatibility and electrical parameter alignment before substitution.

FAQ

Is the reset delay time adjustable on the BU45K322G-TL?

No, the BU45K322G-TL features a fixed reset delay timer of 200ms. Adjustable delay options are available in other models within the same product family.

What is the hysteresis voltage characteristic of this detector?

The hysteresis voltage is determined by the formula VDET multiplied by 0.05, providing noise immunity proportional to the detection voltage setting.