STMicroelectronics LM2904D

Overview

LM2904D from STMicroelectronics is a dual, low-power operational amplifier optimized for single-supply operation in automotive and industrial control systems. It delivers 100 dB DC voltage gain, 1.1 MHz unity-gain bandwidth, ±32 V differential input voltage range, rail-to-rail output swing (0 V to V_CC − 1.5 V), and operates from 3 V to 30 V supply. It is widely used in transducer signal conditioning and DC gain blocks interfacing with 5 V logic systems.

For engineers reviewing the LM2904D datasheet, LM2904D pinout, LM2904D application, or LM2904D equivalent, key selection criteria include input offset voltage (max 7 mV at 25 °C), input bias current (20 nA typ), supply current (0.7–1.2 mA per amplifier), common-mode input range extending to negative rail, and thermal robustness up to 125 °C ambient.

Technical Context

This device integrates two independent high-gain op-amps with internal frequency compensation and PNP-input stage architecture, enabling input common-mode voltage down to the negative rail (V_CC−) and differential input range equal to full supply voltage. Its design supports stable operation under varying load and temperature conditions without external compensation.

The amplifier features temperature-compensated input offset current (2 nA max) and bias current (20 nA typ), low input offset voltage drift (7–30 µV/°C), and high CMRR (70–85 dB) across 0–28.5 V common-mode range. Output stage delivers ±40 mA short-circuit current and supports direct interface with logic-level loads.

Key Specifications

Pinout & Package

LM2904D is supplied in SO8 package (standard small-outline IC, 1.27 mm pitch), with exposed pad not present. Pin functions are identical across SO8, MiniSO8, TSSOP8, and DFN8 variants per STMicroelectronics DS0508 Rev 21.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual operational amplifier applications.

Compared with LM2904D, LM2904DT offers identical performance with reel packaging for SMT efficiency, while LM2904PT reduces board area by 45% but demands careful thermal derating above 85 °C ambient due to higher R_thJA.

Availability

LM2904D is available at Aetrix Electronics and suitable for automotive cabin control, industrial 4–20 mA receivers, and smart sensor signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM2904D 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 analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The LM2904 series belongs to ST's general-purpose operational amplifier product line, engineered specifically for cost-sensitive, high-reliability single-supply applications in harsh environments such as automotive engine bays and factory automation systems.

FAQ

Is LM2904D pin-compatible with legacy LM2904 variants from other manufacturers?

Yes - LM2904D maintains industry-standard SO8 pinout (Out1, In1−, In1+, V_CC−, In2+, In2−, Out2, V_CC+) and matches the electrical behavior of TI, ON Semiconductor, and Diodes Inc. LM2904 equivalents. However, ST's version features enhanced ESD (300 V HBM) and tighter input offset voltage distribution (2–7 mV vs up to 15 mV in some legacy versions), improving accuracy in precision DC applications.

Can LM2904D operate from a 3.3 V supply?

Yes - LM2904D is fully specified from 3 V to 30 V. At 3.3 V, it delivers usable output swing (0 V to ~1.8 V), 100 dB gain, and 20 nA input bias current. However, slew rate drops to ~0.2 V/µs and GBP falls to ~0.7 MHz, making it suitable for DC and low-frequency (<10 kHz) signal conditioning but not high-speed AC coupling.

What is the maximum capacitive load LM2904D can drive without instability?

LM2904D is stable driving up to 100 pF directly, as verified in Figure 20 of DS0508 Rev 21 (phase margin >45° at 15 V supply). For loads >100 pF, a series resistor (≥100 Ω) between output and capacitor is required to maintain stability. This limitation arises from its internally compensated architecture optimized for unity-gain stability, not high-current capacitive driving.

Does LM2904D support dual-supply operation?

Yes - although optimized for single-supply use, LM2904D supports split supplies (e.g., ±15 V) within absolute maximum ratings (±16 V or 32 V total). Input common-mode range extends to V_CC−, and output swing reaches within 1.5 V of either rail. However, its PNP input stage exhibits lower input bias current in single-supply mode; dual-supply use may increase I_ib slightly due to junction biasing effects.