STMicroelectronics LM2902Q4T

Overview

LM2902Q4T from STMicroelectronics is a quad low-power operational amplifier IC designed for automotive and industrial control systems, featuring 1.3 MHz gain bandwidth, 100 dB large-signal voltage gain, and rail-to-rail input common-mode range extending to the negative rail. It operates from single supplies (3 V to 30 V) or dual supplies (±1.5 V to ±15 V), with 375 µA per amplifier supply current and 20 nA input bias current - enabling precision signal conditioning in battery-powered sensor interfaces.

For engineers reviewing the LM2902Q4T datasheet, LM2902Q4T pinout, LM2902Q4T application, or LM2902Q4T equivalent, key selection criteria include its QFN16 3×3 wettable flank package, −40 °C to +125 °C automotive-grade temperature range, input offset voltage ≤7 mV (typ), output short-circuit robustness, and compatibility with single-supply AC/DC amplifiers, instrumentation front-ends, and active filters.

Technical Context

The LM2902Q4T integrates four independent internally compensated op amps using PNP-input transistor pairs, enabling input common-mode voltage down to the negative rail (VCC−). Its architecture supports stable unity-gain operation and delivers 0.4 V/µs slew rate with 1.3 MHz GBP under 30 V supply.

It features rail-to-rail output swing capability (e.g., VOL ≤20 mV at RL = 10 kΩ, VCC+ = 5 V), 120 dB channel separation at 1–20 kHz, and ESD protection rated at 370 V HBM - critical for noise-immune analog signal chains in harsh automotive environments.

Key Specifications

Pinout & Package

LM2902Q4T uses a 16-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with wettable flanks for automated optical solder-joint inspection. The exposed thermal pad is electrically connected to VCC− and enhances thermal dissipation (R_thJC = 14 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2902DT, LM2902Q4T offers superior thermal performance and manufacturability for automotive production; versus TSV914IQ4T, it trades bandwidth and offset for lower power and proven ruggedness in harsh environments - making it optimal for cost-constrained, thermally demanding sensor signal chains.

Availability

LM2902Q4T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC analog I/O modules, and ADAS sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM2902Q4T 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, designing and manufacturing microcontrollers, power management ICs, analog components, and automotive-grade semiconductors.

The LM2902 product line delivers low-power, high-reliability quad op amps optimized for automotive and industrial applications where extended temperature operation, ESD robustness, and supply flexibility are mandatory.

FAQ

What is the maximum supply voltage for LM2902Q4T?

The absolute maximum supply voltage is 32 V across VCC+ and VCC− terminals. For reliable operation, ST specifies 3 V to 30 V for single-supply use and ±1.5 V to ±15 V for dual-supply configurations. Exceeding 30 V risks permanent damage due to internal junction breakdown, especially under transient conditions.

Does LM2902Q4T support rail-to-rail output swing?

Yes - LM2902Q4T delivers rail-to-rail output voltage swing: VOH ≥26 V and VOL ≤20 mV (at RL = 10 kΩ, VCC+ = 30 V, Tamb = 25 °C). Output cannot reach exact rails under heavy load (e.g., RL = 2 kΩ yields VOL ≈ 5 mV), but remains within 20 mV of rails under typical conditions.

How is the exposed thermal pad on the QFN16 package used?

The exposed pad on LM2902Q4T's QFN16 3×3 wettable flank package must be soldered to a PCB copper pour connected to VCC−. This connection provides both thermal conduction (R_thJC = 14 °C/W) and electrical grounding for the substrate, improving stability and reducing thermal resistance by >65% versus non-connected pads.

Can LM2902Q4T drive capacitive loads directly?

LM2902Q4T is not unity-gain stable with capacitive loads >100 pF without external compensation. Datasheet Figure 8 shows pulse response degradation above 100 pF; for >1 nF loads (e.g., long cables), a series resistor (≥100 Ω) between output and capacitance is required to maintain phase margin and prevent oscillation.