Texas Instruments SM72240MFE-4.63/NOPB

Overview

SM72240MFE-4.63/NOPB from Texas Instruments is a precision 5-pin microprocessor reset supervisor IC designed for renewable energy systems. It monitors +5V supply rails with a factory-programmed 4.63V reset threshold, delivers a minimum 100 ms active-low open-drain RESET pulse (190 ms typical), operates across −40°C to +125°C, and draws only 6 µA typical supply current. It is used in solar inverter control units to ensure reliable microprocessor initialization during brownout and power-up events.

For engineers reviewing the SM72240MFE-4.63/NOPB datasheet, SM72240MFE-4.63/NOPB pinout, SM72240MFE-4.63/NOPB application, or SM72240MFE-4.63/NOPB equivalent, key selection criteria include reset threshold accuracy (±0.09 V), guaranteed reset timeout over temperature, MR input debouncing, low-voltage RESET validity down to VCC ≥ 1 V, and SOT-23 (DBV) package compatibility with high-density PCB layouts.

Technical Context

The SM72240MFE-4.63/NOPB integrates a precision bandgap reference (1.225 V), dual comparators (reset and manual reset), and a one-shot timer to generate deterministic reset timing. Its reset assertion logic responds to both VCC falling below 4.63 V and MR pin pull-down events, with independent propagation delays (2 µs MR-to-RESET, 20 µs VCC-to-RESET).

It features built-in immunity to short VCC transients (e.g., ≤40 µs at 125 mV underdrive) and includes an internal 22 kΩ MR pull-up resistor. The open-drain RESET output supports flexible voltage-level interfacing via external pull-up and remains functional down to VCC = 1 V - critical for fail-safe operation in unregulated solar harvesters.

Key Specifications

Pinout & Package

The SM72240MFE-4.63/NOPB is housed in a 5-pin SOT-23 (DBV) package with 1.45 mm max height, compatible with standard pick-and-place and reflow processes. Pin 1 is marked by an index area on the top surface; orientation follows JEDEC MO-178 with quadrant Q3 feed direction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811TEUS+T and TPS3808G33DBVR, the SM72240MFE-4.63/NOPB uniquely combines renewable-energy-grade temperature range, ultra-low 6 µA supply current, factory-programmed 4.63 V threshold, and integrated MR pull-up - making it optimal for space-constrained, high-reliability solar electronics where component count and thermal margin are critical.

Availability

SM72240MFE-4.63/NOPB is available at Aetrix Electronics and suitable for solar inverter control units, smart energy meters, and industrial PV monitoring nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SM72240MFE-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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability industrial ICs.

The SM72240 product line is part of TI's SolarMagic portfolio, engineered specifically for photovoltaic system monitoring and control - emphasizing precision voltage supervision, wide-temperature operation, and low-power design for renewable energy infrastructure.

FAQ

What is the exact reset threshold voltage of the SM72240MFE-4.63/NOPB?

The SM72240MFE-4.63/NOPB has a factory-programmed reset threshold of 4.63 V, with a guaranteed tolerance of ±0.09 V (4.54 V to 4.72 V) across the full operating temperature range of −40°C to +125°C. This value is laser-trimmed during production and does not require external calibration. The SM72240MFE-4.63/NOPB is explicitly rated for monitoring nominal 5 V supplies, and its threshold corresponds to 90.8–94.4% of that rail.

Does the SM72240MFE-4.63/NOPB support manual reset functionality?

Yes, the SM72240MFE-4.63/NOPB includes a dedicated Manual Reset (MR) input on Pin 4. It is internally pulled up with a 22 kΩ resistor and accepts active-low logic signals. Pulling MR below 0.8 V for more than 100 ns initiates a full reset cycle, holding RESET low for 190 ms (typical) after MR returns high. No external debounce circuitry is needed, and the MR pin may be left floating if unused.

What package type and pin configuration does the SM72240MFE-4.63/NOPB use?

The SM72240MFE-4.63/NOPB uses a 5-pin SOT-23 package (JEDEC MO-178, TI package code DBV), with 1.45 mm maximum height and Q3 quadrant orientation for tape-and-reel feeding. Pinout is: Pin 1 = GND, Pin 2 = GND, Pin 3 = RESET (open-drain), Pin 4 = MR, Pin 5 = VCC. Both ground pins must be connected to the system ground plane for optimal thermal and noise performance.

Can the SM72240MFE-4.63/NOPB operate reliably at high ambient temperatures?

Yes, the SM72240MFE-4.63/NOPB is fully specified from −40°C to +125°C ambient temperature, with all electrical parameters - including reset threshold, timeout, and supply current - guaranteed across this range. Its design includes thermal protection and stable bandgap reference performance, making it suitable for under-hood automotive solar controllers or rooftop-mounted PV electronics without derating.

Is the RESET output of the SM72240MFE-4.63/NOPB compatible with 3.3 V microcontrollers?

Yes, the RESET output is an active-low open-drain driver, allowing direct interface with 3.3 V logic systems. An external pull-up resistor (typically 10–100 kΩ) should connect RESET to the target MCU's I/O supply (e.g., 3.3 V). The SM72240MFE-4.63/NOPB guarantees VOL ≤ 0.4 V at 3.2 mA sink current and remains functional for VCC ≥ 1 V - ensuring interoperability even during partial power collapse.