Texas Instruments LM3722IM5X-3.08/NOPB

Overview

LM3722IM5X-3.08/NOPB from Texas Instruments is a precision 3.08 V active-low microprocessor reset supervisor IC in SOT-23-5 package, monitoring 3.3 V supply rails with ±1.5% threshold accuracy over −40°C to +85°C, 190 ms reset timeout, and guaranteed RESET validity down to VCC ≥1 V - used in embedded controllers and portable instrumentation for reliable power-on initialization.

For engineers reviewing the LM3722IM5X-3.08/NOPB datasheet, LM3722IM5X-3.08/NOPB pinout, LM3722IM5X-3.08/NOPB application, or LM3722IM5X-3.08/NOPB equivalent, key selection criteria include reset threshold tolerance (±1.5%), industrial temperature range, open-drain compatibility (not applicable - push-pull), manual reset debouncing, and low 6 µA supply current for battery-sensitive designs.

Technical Context

The LM3722IM5X-3.08/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 (typical 190 ms) active-low reset pulse after VCC rises above 3.08 V or MR is released. It uses internal 22 kΩ pull-up on MR and asserts RESET until both VCC exceeds threshold and timeout expires.

Its architecture provides immunity to short VCC transients (<40 µs at 125 mV under threshold) and guarantees valid output down to VCC = 1 V, with no external components required for basic operation - supporting robust reset generation in noisy or brownout-prone 3.3 V systems.

Key Specifications

Pinout & Package

LM3722IM5X-3.08/NOPB is housed in a 5-pin SOT-23 (DBV) package with gull-wing leads, 1.27 mm pitch, and thermal pad not connected internally. The device substrate connects to Pin 2 (GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3722IM5X-3.08/NOPB, TPS3808G30DBVR offers superior accuracy and lower supply current but requires external biasing for its open-drain output, while MAX809SEUR+T sacrifices MR support and threshold precision for minimal footprint - making LM3722IM5X-3.08/NOPB optimal for cost-sensitive industrial designs needing integrated MR and proven 3.3 V rail supervision.

Availability

LM3722IM5X-3.08/NOPB is available at Aetrix Electronics and suitable for industrial controllers, portable data loggers, medical handheld diagnostics, and smart energy meters requiring stable component supply across extended production lifecycles.

Supply support for LM3722IM5X-3.08/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 technologies, with decades of experience in power management and supervisory ICs.

The LM3722IM5X-3.08/NOPB belongs to TI's microprocessor supervisory circuit family, designed specifically for reliable power-on reset, brownout protection, and manual reset integration in resource-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of LM3722IM5X-3.08/NOPB and how tightly is it specified?

The LM3722IM5X-3.08/NOPB has a factory-programmed reset threshold of 3.08 V, specified with ±1.5% tolerance over the full industrial temperature range (−40°C to +85°C). This corresponds to a 3.00 V to 3.15 V window at 25°C and maintains tight tracking across temperature, enabling accurate supervision of 3.3 V rails without external calibration. The LM3722IM5X-3.08/NOPB achieves this using a trimmed 1.225 V internal reference and precision comparator design.

Does LM3722IM5X-3.08/NOPB support manual reset, and how is the MR pin interfaced?

Yes, LM3722IM5X-3.08/NOPB includes a fully debounced Manual Reset (MR) input on Pin 4, featuring an internal 22 kΩ pull-up to VCC. To assert reset, MR must be pulled below 0.25×VCC for >100 ns; release triggers a 190 ms reset pulse. No external components are needed for basic pushbutton use - simply connect a momentary switch between MR and GND. The LM3722IM5X-3.08/NOPB also tolerates MR glitches <100 ns.

What is the RESET output type of LM3722IM5X-3.08/NOPB, and what load can it drive?

The LM3722IM5X-3.08/NOPB features an active-low push-pull RESET output (Pin 3) capable of sinking up to 3.2 mA while maintaining VOL ≤0.4 V. It directly interfaces with standard CMOS and TTL inputs without external pull-up resistors. Unlike the LM3724 variant, the LM3722IM5X-3.08/NOPB does not require an external pull-up, simplifying design and reducing component count. Its push-pull structure ensures fast, low-impedance transitions critical for timing-sensitive processors.

Can LM3722IM5X-3.08/NOPB operate reliably during deep brownout conditions?

Yes, LM3722IM5X-3.08/NOPB guarantees valid RESET output functionality down to VCC = 1.0 V, per its Electrical Characteristics table. Below 1 V, the output may not sink rated current, but the part continues asserting RESET until VCC recovers above 3.08 V and the 190 ms timeout completes. This behavior ensures deterministic reset hold during severe brownouts - a key requirement for systems like smart meters or industrial sensors where power instability is common. The LM3722IM5X-3.08/NOPB's design explicitly targets such scenarios.

What package and environmental compliance does LM3722IM5X-3.08/NOPB have?

LM3722IM5X-3.08/NOPB is supplied in a RoHS-compliant, lead-free SOT-23-5 (DBV) package with green finish (no Sb/Br), JEDEC Level-1 moisture sensitivity, and 100% matte tin (CuSn) lead finish. It meets industrial temperature requirements (−40°C to +85°C) and is qualified per TI's production standards. The "NOPB" suffix confirms Pb-free construction, and "IM5X" denotes tape-and-reel packaging (3000 units per reel). The LM3722IM5X-3.08/NOPB carries TI's standard limited warranty and is not intended for automotive or military applications unless separately qualified.