STMicroelectronics LM2904WN

Overview

LM2904WN from STMicroelectronics is a low-power dual operational amplifier designed for single-supply operation in automotive and industrial control systems. It features 100 dB DC voltage gain, 1.1 MHz unity-gain bandwidth, 500 µA per channel supply current, rail-to-rail input common-mode range (including negative rail), and output swing to within 1.5 V of VCC+. It is widely used in transducer amplifiers and DC gain blocks interfacing with +5 V logic systems.

For engineers reviewing the LM2904WN datasheet, LM2904WN pinout, LM2904WN application, or LM2904WN equivalent, key selection criteria include its automotive-grade temperature range (−40°C to +125°C), internal frequency compensation, low input bias current (20 nA), ESD protection (2 kV HBM), and compatibility with single-supply 3–30 V operation.

Technical Context

The LM2904WN integrates two independent high-gain op-amps with internal frequency compensation, enabling stable unity-gain operation without external components. Its input stage uses PNP transistors to achieve input common-mode voltage range extending to the negative rail and differential input voltage range equal to the full supply voltage.

In linear mode, it supports true single-supply operation: inputs accept signals down to ground, and outputs swing to within 20 mV of ground and up to (VCC+ − 1.5 V). The device maintains 70 dB minimum CMRR and 65 dB minimum SVR across −40°C to +125°C, with thermal resistance of 85 °C/W (DIP8 package).

Key Specifications

Pinout & Package

DIP8 (Plastic Dual In-line Package), 8-pin through-hole, ECOPACK® compliant, with 2.54 mm lead pitch and 9.02–10.16 mm body width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2904WN, LM2904DT trades automotive qualification and extended temperature for surface-mount convenience, while TSV912IDT offers superior speed and accuracy at the expense of power efficiency and thermal ruggedness - making LM2904WN optimal for cost-effective, thermally demanding, single-supply industrial and automotive signal conditioning.

Availability

LM2904WN is available at Aetrix Electronics and suitable for transducer amplification, industrial sensor interfacing, and automotive body control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM2904WN 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 industrial, automotive, and consumer markets.

The LM2904W series belongs to ST's precision analog portfolio, engineered specifically for robust, low-cost signal conditioning in harsh-environment applications where single-supply operation, thermal stability, and automotive qualification are critical.

FAQ

Is LM2904WN pin-compatible with standard LM2904 variants?

Yes, LM2904WN uses the industry-standard DIP8 pinout shared by all LM2904-family dual op-amps, including TI, ON Semiconductor, and Diodes Inc. equivalents. Pin 1 is Inverting Input B, Pin 2 is Non-inverting Input B, Pin 3 is Output B, Pin 4 is VCC−, Pin 5 is VCC+, Pin 6 is Output A, Pin 7 is Non-inverting Input A, and Pin 8 is Inverting Input A - verified per STMicroelectronics Doc ID 9893 Rev 11, Figure 1 and Table 7.

What is the maximum capacitive load the LM2904WN can drive without instability?

LM2904WN is unity-gain stable and can safely drive ≥100 pF loads, as confirmed in Figure 17 (Phase Margin vs Capacitive Load) of the datasheet. For loads exceeding 100 pF, a series resistor (≥100 Ω) between output and capacitance is recommended to maintain phase margin above 45°, especially at high temperatures or with heavy reactive loads.

Does LM2904WN support split-supply operation?

Yes, LM2904WN operates with split supplies (e.g., ±15 V) as well as single supplies. Its input common-mode range extends from VCC− to (VCC+ − 1.5 V), and differential input voltage range equals the total supply voltage. Absolute maximum ratings specify VCC = +32 V and Vid = −0.3 V to VCC + 0.3 V, confirming safe use in dual-rail configurations.

How does LM2904WN handle input overvoltage conditions?

LM2904WN includes internal ESD diodes (2 kV HBM) and input clamping behavior: if either input is driven below VCC− − 0.3 V, base-collector junctions forward-bias, limiting current to ~50 mA (per Table 1). This protects the IC but may cause temporary output saturation; recovery is immediate once input returns within −0.3 V to VCC+ + 0.3 V.