Texas Instruments LM3722IM5X-4.63/NOPB

Overview

LM3722IM5X-4.63/NOPB from Texas Instruments is a precision 5-pin SOT-23 microprocessor reset supervisor IC with active-low push-pull RESET output, factory-trimmed 4.63 V reset threshold (±1.5% over −40°C to +85°C), 190 ms typical reset timeout, guaranteed RESET validity down to VCC ≥1 V, and 6 µA typical supply current. It monitors 5 V supply rails in embedded controllers and portable systems requiring reliable power-on/brown-out reset assertion.

For engineers reviewing the LM3722IM5X-4.63/NOPB datasheet, LM3722IM5X-4.63/NOPB pinout, LM3722IM5X-4.63/NOPB application, or LM3722IM5X-4.63/NOPB equivalent, key selection factors include its industrial temperature range (−40°C to +85°C), SOT-23-5 package compatibility, manual reset (MR) input with internal 22 kΩ pull-up, and immunity to sub-100 ns MR glitches.

Technical Context

The LM3722IM5X-4.63/NOPB integrates a precision voltage reference (1.225 V), dual comparators (reset and manual reset), and a one-shot timer to generate a minimum 100 ms (190 ms typical) active-low RESET pulse after VCC rises above 4.63 V or MR deasserts. Its internal architecture ensures reset assertion during power-up, brown-out, and manual reset events without external timing components.

It features built-in power supply transient immunity: negative-going VCC transients ≤125 mV below threshold and ≤40 µs duration do not trigger false resets. The MR input is fully debounced with 10 µs minimum pulse width requirement and 2 µs propagation delay to RESET assertion.

Key Specifications

Pinout & Package

LM3722IM5X-4.63/NOPB uses the industry-standard SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.15 mm body, gull-wing leads, RoHS-compliant green finish (Pb-free, no Sb/Br), moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811TEUS+T, LM3722IM5X-4.63/NOPB delivers 50 ms longer typical reset pulse-critical for modern low-voltage MCUs with extended internal clock stabilization-and lower supply current. Against TPS3808G33DBVR, it offers factory-trimmed accuracy without external components, reducing design risk and test complexity for 5 V rail supervision.

Availability

LM3722IM5X-4.63/NOPB is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, embedded gateways, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LM3722IM5X-4.63/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 leader specializing in analog, embedded processing, and digital signal processing technologies, with decades of experience in power management and system supervision ICs.

The LM3722 series belongs to TI's precision voltage supervisor product line, designed specifically for reliable microprocessor reset generation in cost-sensitive, space-constrained industrial and portable applications where accuracy, low power, and temperature stability are essential.

FAQ

What is the exact reset threshold voltage of LM3722IM5X-4.63/NOPB and how stable is it over temperature?

The LM3722IM5X-4.63/NOPB has a factory-trimmed reset threshold of 4.63 V with ±1.5% tolerance over the full industrial temperature range (−40°C to +85°C). Its temperature coefficient is 30 ppm/°C, meaning threshold drift is limited to ±0.014 V across the operating range-ensuring consistent 5 V rail supervision without recalibration.

Does LM3722IM5X-4.63/NOPB require external components to function as a complete reset circuit?

No, LM3722IM5X-4.63/NOPB operates as a fully self-contained reset supervisor. It requires only VCC, GND, and optional MR pull-down; no external capacitors or resistors are needed for basic reset functionality. The internal 22 kΩ MR pull-up and precision reference eliminate typical external BOM items found in discrete reset solutions.

Can LM3722IM5X-4.63/NOPB drive a microcontroller reset pin directly without additional buffering?

Yes, LM3722IM5X-4.63/NOPB features an active-low push-pull RESET output capable of sinking 3.2 mA at VTH min, sufficient to directly drive standard CMOS microcontroller reset inputs (e.g., STM32, PIC, NXP Kinetis). No external transistor or buffer is required unless driving multiple loads or long traces exceeding 100 pF capacitance.

How does the manual reset (MR) input of LM3722IM5X-4.63/NOPB behave during power-up?

The MR input of LM3722IM5X-4.63/NOPB is internally pulled up to VCC via a 22 kΩ resistor, ensuring it defaults high at power-up. Pulling MR low for >10 µs asserts RESET; release triggers the 190 ms timeout. Glitches <100 ns are rejected, preventing false resets from switch bounce or noise during initial power sequencing.

Is LM3722IM5X-4.63/NOPB compatible with systems where VCC may drop below 1 V during brown-out?

LM3722IM5X-4.63/NOPB guarantees RESET output validity only for VCC ≥1 V. Below 1 V, the output cannot sink rated current. To maintain defined logic state, TI recommends adding a 100 kΩ pull-down resistor from RESET to GND-this ensures predictable low-level signaling even during deep brown-out or backup battery transitions.