Texas Instruments LM2936DT-3.3/NOPB

Overview

LM2936DT-3.3/NOPB from Texas Instruments is an ultra-low quiescent current (≤15 μA at 100 μA load) fixed 3.3-V LDO voltage regulator in TO-252 package, featuring 50-mA output capability, 200-mV typical dropout at full load, and −40°C to 125°C operating temperature range. It delivers stable power for automotive body control modules, industrial sensor nodes, and battery-backed real-time clocks where standby current and input transient resilience are critical.

For engineers reviewing the LM2936DT-3.3/NOPB datasheet, LM2936DT-3.3/NOPB pinout, LM2936DT-3.3/NOPB application, or LM2936DT-3.3/NOPB equivalent, key selection factors include its 5.5–40-V input range, ±2% initial output tolerance, −50-V input transient protection, reverse-battery immunity, and mandatory 22-μF/300-mΩ–8-Ω ESR output capacitor requirement for stability.

Technical Context

The LM2936DT-3.3/NOPB uses a PNP pass transistor architecture enabling low dropout and inherent reverse-polarity protection without external diodes. Its internal bandgap reference and error amplifier maintain regulation across line (±3% over 5.5–40 V), load (100 μA–50 mA), and temperature (−40°C to 125°C) variations.

Thermal shutdown activates at ~160°C junction temperature and recovers autonomously after ~10°C cooldown; short-circuit current limiting caps output at 65–250 mA depending on conditions. No shutdown pin is present-this variant lacks the SD function found only in LM2936BM packages.

Key Specifications

Pinout & Package

LM2936DT-3.3/NOPB is housed in a TO-252 (NDP) surface-mount package with exposed thermal pad (Tab) connected to GND. The 3-pin configuration minimizes PCB footprint while enabling high thermal performance via soldered Tab.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO voltage regulator applications.

Compared with TPS76333QDBVRQ1 and MCP1703T-3302E/MB, the LM2936DT-3.3/NOPB uniquely balances ultra-low IQ, robust automotive-grade input protection, and TO-252 thermal performance - making it optimal for space-constrained, battery-sensitive applications where reliability under harsh electrical conditions is non-negotiable.

Availability

LM2936DT-3.3/NOPB is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and smart meter RTC subsystems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LM2936DT-3.3/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.

The LM2936 product line delivers ultra-low-quiescent-current LDOs optimized for battery-powered and automotive systems demanding high input voltage tolerance, reverse-polarity resilience, and extended temperature operation.

FAQ

What is the minimum input voltage required for LM2936DT-3.3/NOPB to regulate properly?

The LM2936DT-3.3/NOPB requires VIN ≥ VOUT + 1 V (i.e., ≥4.3 V) to enter regulation, though TI recommends VIN ≥ VOUT + 2 V (≥5.3 V) for optimal dynamic performance. Below this threshold, the output tracks the input with no regulation. This behavior is inherent to its PNP pass device architecture and is documented in Section 7.4 "Device Functional Modes" of the SNOSC48O datasheet.

Does LM2936DT-3.3/NOPB include a shutdown pin?

No, LM2936DT-3.3/NOPB does not include a shutdown (SD) pin. Shutdown functionality is exclusive to the LM2936BM SOIC-8 variant. The LM2936DT-3.3/NOPB is a 3-pin TO-252 device with IN, GND, and OUT only - it operates continuously when enabled input voltage is applied within its 5.5–40-V range.

What output capacitor is required for stable operation of LM2936DT-3.3/NOPB?

LM2936DT-3.3/NOPB requires a minimum 22-μF output capacitor with ESR between 300 mΩ and 8 Ω across the full operating temperature range. Ceramic capacitors may be used only if a series resistor (typically 500 mΩ–1 Ω) is added to meet the ESR requirement. This specification is mandatory for loop stability and is explicitly stated in Section 8.2.2.1.2 of the datasheet.

Can LM2936DT-3.3/NOPB withstand reverse battery connection?

Yes, LM2936DT-3.3/NOPB is rated for −24-V reverse polarity input per datasheet Section 1 "Features" and Section 6.5 "Electrical Characteristics". This built-in protection eliminates the need for an external series diode in automotive applications, reducing voltage drop and heat generation compared to diode-based solutions.

What is the thermal performance of LM2936DT-3.3/NOPB in its TO-252 package?

In the TO-252 (NDP) package, LM2936DT-3.3/NOPB has a junction-to-ambient thermal resistance (RθJA) of 50.5°C/W when mounted on a standard 2-layer PCB with 1-in² copper pour. With proper thermal vias under the exposed Tab, it can sustain 50 mA continuous output at 85°C ambient without entering thermal shutdown, as confirmed by thermal data in Section 6.4 of the datasheet.