STMicroelectronics LM2904Q2T

Overview

LM2904Q2T from STMicroelectronics is a dual, low-power operational amplifier optimized for automotive and industrial control systems. It features 100 dB large-signal voltage gain, 1.1 MHz unity-gain bandwidth (temperature compensated), 20 nA input bias current, rail-to-rail input common-mode range including negative rail, and output swing from 0 V to (V_CC+ − 1.5 V). It operates from a single 3–30 V supply and is qualified per AEC-Q100 Grade 1 (−40 °C to +125 °C).

For engineers reviewing the LM2904Q2T datasheet, LM2904Q2T pinout, LM2904Q2T application, or LM2904Q2T equivalent, key selection criteria include input offset voltage drift (7–30 µV/°C), supply current independence from V_CC, ESD robustness (2 kV HBM), wettable flank DFN8 package suitability for automated optical inspection (AOI), and compatibility with 5 V logic-supply interfacing in transducer signal conditioning.

Technical Context

This dual op-amp uses PNP-input transistor pairs enabling input common-mode voltage down to the negative rail and differential input range equal to full supply voltage. Internal frequency compensation ensures stable unity-gain operation without external components across temperature and load variations.

It delivers 40 mA short-circuit output current (sourcing/sinking), supports rail-to-ground output swing in single-supply mode, and maintains CMRR ≥60 dB and PSRR ≥65 dB over −40 °C to +125 °C - critical for precision sensor front-ends and motor control feedback loops where supply noise and common-mode interference are present.

Key Specifications

Pinout & Package

LM2904Q2T is housed in a 2 × 2 mm DFN8 package with wettable flanks (JEDEC MO-229, variant WD8), designed for AOI-compatible solder joint inspection and enhanced thermal performance (R_thJA = 57 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-power op-amp applications.

Compared with LM2904DT, LM2904Q2T provides superior manufacturability via wettable flanks and higher ESD resilience for automotive assembly; versus TSB572IDT, it trades bandwidth and quiescent current for wide-supply operation and proven thermal ruggedness in under-hood environments.

Availability

LM2904Q2T is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, and battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM2904Q2T 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities and AEC-Q100-compliant qualification processes.

LM2904Q2T belongs to ST's automotive-qualified precision op-amp portfolio, engineered specifically for signal conditioning in harsh-environment electronic control units where reliability, thermal stability, and ESD immunity are non-negotiable.

FAQ

What is the maximum allowable supply voltage for LM2904Q2T?

The absolute maximum supply voltage is 32 V (±16 V dual supply equivalent), but recommended operating range is 3 V to 30 V. Operation above 30 V risks exceeding junction temperature limits under load, especially with >10 mA output current or ambient temperatures >85 °C - refer to R_thJA = 57 °C/W and derating curves in DS0508 Rev 21, page 4.

Does LM2904Q2T support rail-to-rail output swing?

No - LM2904Q2T provides output swing from 0 V to (V_CC+ − 1.5 V) under load. At light loads (RL ≥ 10 kΩ), VOL can reach 5 mV and VOH up to 28 V (at V_CC+ = 30 V), but full rail-to-rail output requires dedicated RRIO op-amps like TSX922IYDT. This limitation is inherent to its bipolar PNP-input architecture.

Can LM2904Q2T drive capacitive loads directly?

Stable operation is guaranteed for capacitive loads ≤100 pF per datasheet Figure 20 (phase margin >45° at 15 V supply). For larger loads (e.g., >500 pF cables or ADC input capacitance), an isolation resistor (≥100 Ω) must be placed in series with the output to prevent peaking or oscillation - verified in application note AN2867.

Is the exposed thermal pad on LM2904Q2T electrically connected?

No - the exposed pad on the DFN8 2x2 wettable flank package is electrically isolated and intended solely for thermal conduction. ST recommends connecting it to V_CC− (ground) via minimum 4 thermal vias (0.3 mm diameter) to optimize R_thJA and ensure junction temperature stays below 150 °C at 125 °C ambient and full output load.