Texas Instruments LM9071SX/NOPB

Overview

LM9071SX/NOPB from Texas Instruments is a 5 V, 250 mA automotive-grade low-dropout linear voltage regulator with integrated delayed active-low reset flag. It delivers stable 5 V output across 6–26 V input, maintains ≤3% output tolerance, and features reverse-battery protection, thermal shutdown, and RFI-immune reset generation-designed for microprocessor power and supervision in engine control units and body electronics.

For engineers reviewing the LM9071SX/NOPB datasheet, LM9071SX/NOPB pinout, LM9071SX/NOPB application, or LM9071SX/NOPB equivalent, this page provides verified package mapping (TO-263/KTT), reset delay programmability via external capacitor, dropout voltage under load, automotive temperature range (−40°C to +125°C), and real-world protection behavior against load dump and reverse polarity.

Technical Context

The LM9071SX/NOPB integrates a PNP pass transistor with saturation detection to minimize quiescent current surge in dropout, enabling stable operation down to 5.5 V input while avoiding oscillation in high-inductance supply lines. Its reset circuit monitors output voltage drop of −300 mV to −500 mV relative to nominal 5 V and holds the active-low flag low for a user-programmable interval using an external capacitor.

Designed specifically for automotive FMEA-critical systems, it withstands +60 V/100 ms positive transients and −50 V/1 ms negative transients, suppresses false resets under 300 V/m radiated RF fields (2–400 MHz), and internally connects the tab and backside metal to ground-enabling direct PCB thermal coupling in TO-263 packaging.

Key Specifications

Pinout & Package

LM9071SX/NOPB is housed in a 5-lead DDPAK/TO-263 (package drawing KTT0005B) with exposed thermal tab electrically and thermally connected to GND. The tab must be soldered to a large copper pour for effective heat dissipation; θ_J-A improves from 80°C/W (no heatsink) to 32°C/W with 1.6 in² of 1-oz copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO-with-reset applications.

Compared with TLE4260G and LM2927T, the LM9071SX/NOPB uniquely combines programmable reset delay, RFI-hardened reset assertion, and integrated reverse-battery clamping-making it the preferred choice for new automotive designs requiring single-chip power integrity and supervision.

Availability

LM9071SX/NOPB is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS sensor hubs requiring stable component supply across extended automotive temperature and reliability requirements.

Supply support for LM9071SX/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 automotive ICs, with decades of qualification expertise in AEC-Q100-compliant power management.

The LM9071SX/NOPB belongs to TI's automotive LDO regulator family engineered for functional safety-critical power domains-emphasizing fault detection, transient resilience, and EMI robustness in vehicle electronic control systems.

FAQ

What is the maximum input voltage the LM9071SX/NOPB can withstand during load dump events?

The LM9071SX/NOPB is rated to withstand +60 V transients for up to 100 ms per ISO 7637-2 Pulse 5a, eliminating the need for external TVS diodes in most automotive front-end designs. This capability is built into the IC's input protection circuitry and does not require derating or external components to achieve.

Does the LM9071SX/NOPB require an external capacitor to set the reset delay time?

Yes-the LM9071SX/NOPB uses an external capacitor connected to the CDEL pin to program the reset delay interval. With a 0.1 µF capacitor, the delay ranges from 7.6 ms to 35 ms depending on process variation; larger capacitors extend the delay linearly, enabling precise alignment with system power-up timing requirements.

How does the LM9071SX/NOPB handle reverse battery connection?

When subjected to reverse battery (e.g., −15 V on IN), the LM9071SX/NOPB clamps its output to −0.8 V maximum, protecting downstream 5 V logic circuits without requiring external blocking diodes. This feature is implemented via internal protection structures and operates across the full −40°C to +125°C temperature range.

Is the thermal pad of the LM9071SX/NOPB electrically connected, and how should it be routed?

Yes-the exposed thermal tab of the LM9071SX/NOPB (TO-263/KTT package) is internally connected to GND. It must be soldered to a dedicated PCB copper pour tied to the system ground plane. Using ≥1.0 in² of 1-oz copper reduces θ_J-A from 80°C/W to 37°C/W, directly improving thermal headroom and maximum sustainable output current.

What is the minimum output capacitance required for stability of the LM9071SX/NOPB?

The LM9071SX/NOPB requires a minimum output capacitance of 10 µF with ESR < 3 Ω for guaranteed stability; Texas Instruments recommends 47 µF for optimal transient response and RFI suppression. Ceramic, tantalum, or low-ESR aluminum electrolytic capacitors meeting these specs ensure reliable regulation across temperature and load conditions.