Texas Instruments LM8365BALMF45/NOPB

Overview

LM8365BALMF45/NOPB from Texas Instruments is a micropower undervoltage-sensing circuit with active-low open-drain reset output, 4.5 V detection threshold (±2.5%), programmable delay via external capacitor (130 ms typical with 0.1 μF), and 0.7 μA quiescent current at VIN = 4.34 V. It monitors supply rails in battery-powered microprocessor systems to prevent erratic operation during brownout.

For engineers reviewing the LM8365BALMF45/NOPB datasheet, LM8365BALMF45/NOPB pinout, LM8365BALMF45/NOPB application, or LM8365BALMF45/NOPB equivalent, key selection considerations include threshold accuracy over temperature (±100 ppm/°C), built-in hysteresis (0.225 V typical), CD pin internal pull-up resistance (1 MΩ typical), guaranteed operation down to 1 V input, and SOT-23-5 package compatibility with space-constrained portable designs.

Technical Context

The LM8365BALMF45/NOPB integrates a precision voltage reference, comparator with trimmed 4.5 V threshold (VDET−), and hysteresis (VHYS = 0.225 V typical) to prevent oscillation near trip point. Its functional block includes an internal N-channel MOSFET for rapid CD pin discharge on undervoltage and a 1 MΩ pull-up resistor (RD) to charge the external capacitor during recovery.

Reset assertion occurs when VIN falls below 4.388 V (min) and releases only after VIN exceeds VDET+ = VDET− + VHYS and the CD capacitor charges to 0.675 × VIN. Propagation delay tD2 (low-to-high) is defined with 470 kΩ pull-up to VIN and 10 pF load, enabling predictable timing control without external logic.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, 1.45 mm max height, JEDEC MO-178 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar undervoltage-sensing applications.

Compared with TLV803SDBZR and MAX809SEUR+T, the LM8365BALMF45/NOPB uniquely combines 4.5 V precision threshold, ultra-low 0.7 μA current, and user-adjustable delay-enabling optimized trade-offs between battery life, timing margin, and PCB area in portable systems.

Availability

LM8365BALMF45/NOPB is available at Aetrix Electronics and suitable for portable electronics, microprocessor reset control, and battery backup detection requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for LM8365BALMF45/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability ICs for industrial, automotive, and personal electronics.

The LM8365BALMF45/NOPB belongs to TI's supervisor IC product line, designed specifically for ultra-low-power voltage monitoring in battery-critical applications where extended runtime and precise brownout protection are mandatory.

FAQ

What is the exact detection threshold voltage of the LM8365BALMF45/NOPB?

The LM8365BALMF45/NOPB has a nominal detection threshold of 4.5 V, with a guaranteed range of 4.388 V to 4.613 V at 25°C (±2.5%). This threshold applies to the falling edge of VIN (high-to-low transition), and the device incorporates 0.225 V typical hysteresis to ensure stable release above VDET+ = VDET− + VHYS.

How does the CD pin function in the LM8365BALMF45/NOPB?

The CD pin on the LM8365BALMF45/NOPB serves as the delay capacitor terminal. During undervoltage, an internal N-channel MOSFET discharges the external capacitor to 0 V. Upon recovery, the capacitor charges through a 1 MΩ internal resistor (RD) until it reaches 0.675 × VIN, at which point the RESET output returns high. This mechanism implements the programmable delay without external components.

Can the LM8365BALMF45/NOPB operate from a 1.8 V supply?

Yes, the LM8365BALMF45/NOPB operates across an input voltage range of 1 V to 6 V. At 1.8 V, it maintains full functionality-including accurate 4.5 V threshold detection relative to VIN, hysteresis, and CD pin timing-though the RESET output will be limited to sinking current into a pull-up referenced to VIN rather than a higher rail.

What is the recommended pull-up resistor value for the RESET output of the LM8365BALMF45/NOPB?

Texas Instruments specifies timing parameters (e.g., tD2) using a 470 kΩ pull-up resistor to VIN. While other values may be used, 470 kΩ balances speed (lower resistance) and quiescent current (higher resistance). For 3.3 V systems, 100 kΩ to 1 MΩ is typical; ensure sink current capability (≥1 mA at VOL = 0.5 V) is met per the LM8365BALMF45/NOPB electrical characteristics table.

Is the LM8365BALMF45/NOPB pin-compatible with the MC33465 series?

Yes, the LM8365BALMF45/NOPB is explicitly documented as pin-for-pin compatible with the MC33465 family. Both use SOT-23-5 packaging with identical pin 1 (RESET), pin 2 (INPUT), pin 3 (GND), pin 4 (N/C), and pin 5 (CD) assignments, enabling direct replacement in existing MC33465 layouts without PCB modification.