STMicroelectronics LM2904WHD

Overview

LM2904WHD from STMicroelectronics is a dual, low-power, rail-to-rail input operational amplifier designed for automotive and industrial control systems. It features 100 dB DC gain, 1.1 MHz unity-gain bandwidth (temperature compensated), 500 µA supply current per amplifier, 20 nA input bias current, and operates from 3 V to 30 V single supply with input common-mode range extending to ground and output swing to 0 V.

For engineers reviewing the LM2904WHD datasheet, LM2904WHD pinout, LM2904WHD application, or LM2904WHD equivalent, key selection considerations include its AEC-Q100-qualified MiniSO8 package, -40°C to +150°C operating temperature, input offset voltage ≤7 mV (typ), ESD robustness (2 kV HBM), and compatibility with 5 V logic-supply interfacing in transducer signal conditioning.

Technical Context

This dual op-amp integrates internal frequency compensation and rail-to-rail input operation, enabling stable unity-gain configurations without external components. Its input stage accepts common-mode voltages down to ground and up to VCC – 1.5 V, while the output delivers 0 V to VCC – 1.5 V swing under 2 kΩ load.

The device uses a bipolar input stage with temperature-compensated biasing, achieving 2 nA max input offset current and 7 µV/°C max input offset voltage drift. Supply current remains stable across 3–30 V supply range and over full temperature range, supporting reliable operation in harsh automotive environments.

Key Specifications

Pinout & Package

LM2904WHD is supplied in MiniSO8 package (3.0 × 4.9 mm, 0.65 mm pitch), optimized for space-constrained automotive modules. Pin assignments are identical to SO8 but with reduced footprint and higher thermal resistance (R_thJA = 190°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 LM2904BIDR and TSV912IST, LM2904WHD uniquely combines AEC-Q100 Grade 0 qualification, 150°C operation, and 500 µA/amp consumption-making it the only option qualified for engine compartment deployment with ultra-low power constraints.

Availability

LM2904WHD is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC analog input modules, and battery management systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LM2904WHD 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 discrete technologies with vertical manufacturing capability.

LM2904WHD belongs to ST's automotive-qualified precision analog portfolio, engineered specifically for signal conditioning in harsh-environment control systems where reliability, temperature resilience, and ESD robustness are non-negotiable.

FAQ

Is LM2904WHD pin-compatible with standard LM2904 variants?

Yes - LM2904WHD uses the standard MiniSO8 pinout matching SO8 (1–8 numbering), with identical terminal functions: OUT1, IN1–, IN1+, GND, IN2+, IN2–, OUT2, VCC+. This allows drop-in replacement in layouts designed for SO8-packaged LM2904 derivatives, provided board land patterns accommodate MiniSO8 dimensions (3.0 × 4.9 mm vs. SO8's 4.9 × 6.0 mm).

What is the maximum capacitive load LM2904WHD can drive stably?

LM2904WHD is stable with up to 100 pF capacitive load in unity-gain configuration, as verified in Figure 5 (large-signal frequency response) and Figure 6 (pulse response). Driving >100 pF requires series isolation resistor (≥100 Ω) between output and load to maintain phase margin above 45°, especially in high-gain configurations where bandwidth reduction increases susceptibility to ringing.

Does LM2904WHD support rail-to-rail output swing?

No - LM2904WHD provides rail-to-rail *input* common-mode range (including ground), but output swing is limited to 0 V to VCC – 1.5 V under 2 kΩ load (per Table 4). At light loads (<100 µA), output can reach within ~100 mV of VCC, but full rail-to-rail output requires devices like TSV912 or TSX912, which use complementary output stages.

How does the input bias current direction affect circuit design?

LM2904WHD's input bias current flows *out* of both inputs (per datasheet note 2), meaning it subtracts from source current. For high-impedance sensors (e.g., photodiodes in photovoltaic mode), this creates a negative offset. To cancel it, match source impedance at IN+ and IN–, or use a feedback resistor ≤10 kΩ to dominate bias current error - ensuring offset stays below 200 µV in typical 5 V systems.