Texas Instruments LM3723IM5-4.63

Overview

LM3723IM5-4.63 from Texas Instruments is a precision active-high microprocessor reset supervisor IC in SOT-23-5 package, monitoring 5V supply rails with 4.63V ±9mV threshold, guaranteeing RESET assertion for ≥100ms after VCC rises above threshold, and supporting manual reset via MR pin - used in embedded controllers and industrial microprocessor systems requiring reliable power-on initialization.

For engineers reviewing the LM3723IM5-4.63 datasheet, LM3723IM5-4.63 pinout, LM3723IM5-4.63 application, or LM3723IM5-4.63 equivalent, key selection considerations include reset polarity (active-high), guaranteed operation down to VCC ≥1V, low 6µA supply current, temperature-stable 30ppm/°C tempco, and compatibility with MAX811/812-based designs.

Technical Context

The LM3723IM5-4.63 implements a precision bandgap reference (1.225V) feeding a comparator that triggers reset when VCC falls below 4.63V, with internal one-shot timer enforcing ≥100ms minimum reset pulse width (190ms typical). Its MR input includes 22kΩ internal pull-up and 100ns glitch immunity.

It features push-pull active-high RESET output with VOH ≥0.8VCC at ISOURCE = 500µA and VOL ≤0.4V at ISINK = 3.2mA, fully specified over −40°C to +85°C industrial temperature range, and supports valid reset signaling even as VCC drops to 1V.

Key Specifications

Pinout & Package

SOT-23-5 package (DBV drawing), 2.9mm × 1.6mm footprint, 1.0mm max height, RoHS-compliant green finish (CU SN), moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with MAX811SEUS+T and TPS3808G33DBVR, the LM3723IM5-4.63 delivers matched 4.63V threshold and active-high push-pull drive in identical SOT-23-5 packaging - enabling drop-in replacement in legacy 5V µP systems without layout or firmware changes.

Availability

LM3723IM5-4.63 is available at Aetrix Electronics and suitable for industrial controllers, medical instrumentation, and automotive body electronics requiring stable component supply and long-term lifecycle support.

Supply support for LM3723IM5-4.63 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 leader delivering analog, embedded processing, and connectivity solutions with broad industrial, automotive, and communications reach.

The LM3723IM5-4.63 belongs to TI's precision voltage supervisor product line, engineered specifically for reliable microprocessor reset generation in cost-sensitive, space-constrained embedded systems operating across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of the LM3723IM5-4.63 and how is it specified?

The LM3723IM5-4.63 has a factory-programmed reset threshold of 4.63V, with guaranteed limits of 4.54V (min) to 4.72V (max) over the full −40°C to +85°C industrial temperature range. This 4.63V value is optimized for monitoring 5V nominal supplies within a 90.8–94.4% tolerance window, and its 30ppm/°C temperature coefficient ensures minimal drift across operating conditions. The LM3723IM5-4.63 datasheet specifies this parameter under Electrical Characteristics with boldface min/max values for the industrial grade.

Does the LM3723IM5-4.63 support operation at low supply voltages, and what is the minimum valid VCC?

Yes, the LM3723IM5-4.63 guarantees valid RESET output functionality down to VCC ≥1V, meaning the active-high RESET signal remains within defined logic thresholds (VOH ≥0.8VCC, VOL ≤0.4V) even as the supply sags deeply. Below 1V, output behavior is not characterized. This feature ensures deterministic reset assertion during severe brownout conditions where other supervisors may fail. The LM3723IM5-4.63 achieves this using a robust internal reference and low-voltage comparator design.

What is the function of the MR pin on the LM3723IM5-4.63 and how should it be interfaced?

The MR (Manual Reset) pin on the LM3723IM5-4.63 is an active-low input with 22kΩ internal pull-up to VCC. Pulling MR below 0.25VCC for >10µs initiates a reset pulse lasting ≥100ms (190ms typical). It is fully debounced and immune to glitches ≤100ns. For pushbutton use, connect one side to MR and the other to GND; no external pull-up is needed. The LM3723IM5-4.63 datasheet confirms MR propagation delay is 2µs and minimum pulse width is 10µs.

How does the LM3723IM5-4.63 differ from the LM3722 and LM3724 variants in the same family?

The LM3723IM5-4.63 differs from LM3722IM5-4.63 and LM3724IM5-4.63 solely in reset output configuration: LM3723IM5-4.63 provides active-high push-pull RESET, LM3722IM5-4.63 provides active-low push-pull RESET, and LM3724IM5-4.63 provides active-low open-drain RESET. All share identical 4.63V threshold, 100ms min timeout, 6µA supply current, and SOT-23-5 package. Pinout is identical across all three; only pin 3 function differs - confirmed in TI's SNVS154E datasheet Pin Descriptions table.

Is the LM3723IM5-4.63 compatible with MAX811/812-based designs, and what modifications are needed?

Yes, the LM3723IM5-4.63 is explicitly designed as a functional and pin-compatible alternative to MAX811/812 supervisors for 4.63V threshold applications. No PCB changes are required: same SOT-23-5 footprint, identical pinout (GND/GND/RESET/MR/VCC), and matching electrical specs including reset timeout and supply current. The only difference is output polarity - LM3723IM5-4.63 is active-high versus MAX811's active-low - so firmware or downstream logic must accommodate the inverted signal. TI confirms this compatibility in the "Compatible with MAX811/812 Applications" feature list.