FM1233BDS3X

Supervisors Overview

The FM1233BDS3X is a fixed-threshold power supply support circuit designed for monitoring microprocessor systems. It operates within a supply voltage range of 4.5 V to 5.5 V and features a precision temperature-compensated reference. The device provides a reset pulse when the monitored voltage falls below specific thresholds, such as 4.62 V, 4.38 V, or 4.12 V. It includes an open-drain active-low output with an internal 5 kΩ pull-up resistor. The component supports automatic restart after power failure and incorporates internal switch debounce circuitry for external pushbutton overrides. It functions reliably across an operating temperature range of -40°C to +105°C.

Supervisors Feature Summary

• Monitors system voltage and issues a reset pulse during fault conditions
• Features precision temperature-compensated voltage reference and comparator
• Includes internal switch debounce circuitry for external reset recognition
• Provides automatic restart capability following power failure events

Supervisors Applications

• Microprocessor power supply monitoring in 5V systems
• System voltage supervision for embedded controllers
• External pushbutton reset override integration

Supervisors Procurement Notes

Verify the specific threshold voltage variant required for your application, as the FM1233B series offers multiple options including 4.62 V, 4.38 V, and 4.12 V. Confirm that the SOT-23-3 package aligns with your PCB layout constraints. Ensure the open-drain output configuration matches your system's logic level requirements. Cross-reference the datasheet revision to confirm compatibility with current manufacturing standards.

Supervisors Selection Notes

Select this component when a fixed threshold supervisor is needed for 5V microprocessor systems. The internal 5 kΩ pull-up simplifies design by reducing external component count. Consider the 140 ms minimum power-on reset delay to ensure system stability during startup. The wide operating temperature range makes it suitable for industrial environments requiring reliability from -40°C to +105°C.

Supervisors Part Context

The FM1233BDS3X belongs to the Fairchild FM1233 family of supervisor circuits. These devices are engineered to provide reliable reset signals for digital systems. The 'B' suffix typically denotes specific threshold voltage characteristics within the series. The DS3X indicates the SOT-23-3 surface-mount package configuration. This family supports various applications requiring precise voltage monitoring and controlled reset timing.

Supervisors Replacement Considerations

Compatible substitutes include other 3-pin supervisor circuits with similar threshold voltages and SOT-23-3 packaging. Verify that replacement parts offer comparable power-on reset delays and open-drain output configurations. Ensure the alternative component supports the same operating temperature range and supply voltage limits.