Texas Instruments LM8365BALMFX45/NOPB

Overview

LM8365BALMFX45/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 4.34 V - used for battery-backed microprocessor reset control in portable electronics.

For engineers reviewing the LM8365BALMFX45/NOPB datasheet, LM8365BALMFX45/NOPB pinout, LM8365BALMFX45/NOPB application, or LM8365BALMFX45/NOPB equivalent, key selection considerations include its precise 4.5 V threshold, built-in hysteresis (0.225 V typ), SOT-23-5 package compatibility, and operation down to 1 V input while maintaining ultra-low standby current.

Technical Context

The LM8365BALMFX45/NOPB integrates a precision voltage reference, comparator with trimmed 4.5 V threshold (VDET− = 4.388–4.613 V), and internal hysteresis (VHYS = 0.135–0.315 V) to prevent oscillation near threshold. Its CD pin controls delay timing via external RC network, with internal RD ≈ 1 MΩ pull-up and 0.675×VIN delay threshold.

It operates across −40°C to +85°C, supports 1 V to 6 V input range, and delivers RESET output sink current up to 2.5 mA at VIN = 1.5 V with VOL ≤ 0.5 V. The open-drain output requires an external pull-up resistor (e.g., 470 kΩ to VIN or 5 V) for proper logic-level restoration.

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 TPS3808G33DBVR and MAX809SEUR+T, the LM8365BALMFX45/NOPB uniquely combines 4.5 V precision detection, sub-μA quiescent current, and fully programmable delay in a 5-pin SOT-23 - enabling single-component reset supervision without external timing elements or IQ compromises.

Availability

LM8365BALMFX45/NOPB is available at Aetrix Electronics and suitable for portable electronics, microprocessor reset control, and battery backup detection requiring stable component supply and long-term industrial availability.

Supply support for LM8365BALMFX45/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.

The LM8365 series was designed specifically for ultra-low-power voltage monitoring in battery-critical systems - emphasizing precision threshold accuracy, nanoscale quiescent current, and integrated delay functionality to replace discrete supervisor circuits.

FAQ

What is the exact detection threshold voltage of the LM8365BALMFX45/NOPB?

The LM8365BALMFX45/NOPB has a nominal detection threshold of 4.5 V, specified as 4.388 V (min) to 4.613 V (max) at 25°C, with ±2.5% tolerance over temperature and process variation. This value corresponds to the VDET− parameter defined in the Electrical Characteristics table of the official TI datasheet SNVS233C.

Does the LM8365BALMFX45/NOPB require an external pull-up resistor on the RESET pin?

Yes, the LM8365BALMFX45/NOPB features an open-drain RESET output and requires an external pull-up resistor - typically 470 kΩ to VIN or 5 V - to establish a valid high logic level. Without it, the RESET signal remains undefined during inactive states, risking improper system initialization or reset assertion.

How is the reset delay time programmed on the LM8365BALMFX45/NOPB?

The reset delay time on the LM8365BALMFX45/NOPB is set by an external capacitor connected between the CD pin (Pin 5) and GND. With a 0.1 μF capacitor, the typical delay is 130 ms; increasing capacitance linearly scales delay (e.g., 1 μF yields ~1.2 s). No external resistor is needed - internal RD ≈ 1 MΩ provides the timing constant.

What is the minimum operating voltage for the LM8365BALMFX45/NOPB?

The LM8365BALMFX45/NOPB operates down to 1 V input voltage, enabling direct monitoring of deeply discharged batteries or low-voltage energy harvesting sources. At 1 V, it maintains functional reset assertion with specified hysteresis and output sink capability, though quiescent current rises slightly above the 0.7 μA typical value measured at 4.34 V.

Is the LM8365BALMFX45/NOPB pin-compatible with other members of the LM8365 family?

Yes, all LM8365 variants - including LM8365BALMF27/NOPB (2.7 V) and LM8365BALMFX45/NOPB (4.5 V) - share identical SOT-23-5 (DBV) pinout and footprint. Pin 1 (RESET), Pin 2 (INPUT), Pin 3 (GND), Pin 4 (N/C), and Pin 5 (CD) are functionally and physically identical across suffixes, allowing drop-in replacement within the same threshold family.