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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

STMicroelectronics LM2904N

Name: LM2904N
Brand: STMicroelectronics
SKU: LM2904N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2904N

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: LM2904N.pdf

Description:: IC OPAMP GP 2 CIRCUIT 8MINI DIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,915

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Product details

Overview

LM2904N from STMicroelectronics is a dual, low-power 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, input common-mode range extending to the negative rail, rail-to-rail output swing (0 V to V_CC −1.5 V), and 700 µA typical supply current per amplifier at 5 V - enabling direct interfacing with 5 V logic systems without auxiliary supplies.

For engineers reviewing the LM2904N datasheet, LM2904N pinout, LM2904N application, or LM2904N equivalent, key selection considerations include input offset voltage (2–7 mV), temperature-compensated bias current (20 nA), wide 3–30 V supply range, −40 °C to +125 °C operating temperature, and compatibility with SO8, MiniSO8, TSSOP8, and DFN8 2×2 packages.

Technical Context

The LM2904N integrates two independent high-gain op-amps with internal frequency compensation, enabling stable unity-gain operation without external components. Its PNP-input stage delivers rail-inclusive common-mode input range and low input bias current (20 nA), while the output stage supports sourcing up to 40 mA and sinking ≥10 mA into 2 kΩ loads.

It operates across 3–30 V single supply with supply current essentially independent of voltage magnitude. Input offset voltage drift is 7–30 µV/°C, and large-signal voltage gain remains ≥25 V/mV over full temperature range - ensuring consistent performance in transducer amplification and DC gain blocks.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3 V to 30 V - enables direct use with 5 V logic rails and compatibility with 12 V/24 V automotive systems.
Input Offset Voltage	2–7 mV (25 °C), ≤9 mV (−40 °C to +125 °C) - determines baseline DC error in precision sensor signal conditioning.
Large-Signal Voltage Gain	50–100 V/mV (25 °C), ≥25 V/mV (full temp range) - ensures stable closed-loop gain in DC-coupled amplifiers.
Unity-Gain Bandwidth	1.1 MHz (temperature compensated) - supports audio-band and low-speed control loop applications.
Supply Current per Amplifier	0.7–1.2 mA at 5 V (25 °C); ≤2 mA at 30 V (full temp range) - enables low-power battery or energy-constrained designs.
Input Bias Current	20–150 nA (25 °C), ≤200 nA (−40 °C to +125 °C) - minimizes loading on high-impedance sources like thermistors or photodiodes.
Common-Mode Input Range	V_CC− to V_CC+ − 2 V - allows ground-referenced inputs in single-supply configurations.
Output Voltage Swing	0 V to V_CC+ − 1.5 V (RL = 2 kΩ) - supports near-rail output drive for ADC interface and comparator reference generation.

Pinout & Package

LM2904N is commonly supplied in SO8 package (order code LM2904D), with 1.27 mm lead pitch, 5.0 mm × 4.0 mm body, and standard JEDEC MS-012 outline. Pin functions are identical across SO8, MiniSO8, TSSOP8, and DFN8 variants.

Pin/Terminal	Circuit Role	Design Meaning
1	Output A	Amplifier A output; capable of sourcing 40 mA and sinking ≥10 mA into 2 kΩ load.
2	Inverting Input A	Differential input node for Amp A; accepts voltages down to V_CC− (ground in single-supply).
3	Non-Inverting Input A	Differential input node for Amp A; same common-mode range as Pin 2.
4	V_CC−	Negative supply terminal (GND in single-supply); also serves as reference for input and output stages.
5	Non-Inverting Input B	Differential input node for Amp B; electrically isolated from Amp A.
6	Inverting Input B	Differential input node for Amp B; matched offset and bias characteristics to Pins 2–3.
7	Output B	Amplifier B output; identical drive capability and voltage swing to Pin 1.
8	V_CC+	Positive supply terminal; supports 3–30 V operation with minimal supply current variation.

Key Features

Feature	Design Value
Internal frequency compensation	Enables stable unity-gain operation without external capacitors - reduces BOM count and layout sensitivity.
Rail-inclusive input common-mode range	Accepts inputs down to V_CC− (e.g., 0 V in 5 V systems), eliminating need for level-shifting in ground-referenced sensor interfaces.
Low input bias current (20 nA)	Minimizes voltage error across high-impedance feedback networks (e.g., >1 MΩ), preserving accuracy in precision integrators and filters.
Wide supply range (3–30 V)	Supports direct integration into 5 V logic, 12 V automotive, and 24 V industrial power domains without LDO pre-regulation.
Enhanced ESD protection (2000 V HBM)	Improves robustness during board handling and system-level ESD events in automotive and factory environments.
Automotive-qualified variants available	LM2904W/LM2904AW meet AEC-Q100 Grade 1 (−40 °C to +125 °C) with enhanced V_IO and ESD specs - suitable for under-hood ECUs.

Applications

Transducer Signal Conditioning

Industrial Sensor Interface

Use Scenario: Amplifying low-level mV outputs from strain gauges, RTDs, or thermocouples in PLC analog input modules.

IC Role / Device Role / Timing Role: Dual op-amp configured as instrumentation amplifier front-end and low-pass filter driver.

Use Value: Rail-to-rail input/output swing and 20 nA bias current preserve signal integrity across 0–5 V ADC input range without external biasing.

Use Scenario: Converting 4–20 mA current loop signals to 0–5 V for microcontroller ADC sampling in HVAC controllers.

IC Role / Device Role / Timing Role: Transimpedance amplifier and buffer stage with precise gain-setting resistors.

Use Value: 7 mV max input offset and 30 µV/°C drift ensure <±0.1% full-scale error over −25 °C to +70 °C ambient.

Automotive Body Control Unit

Consumer Appliance Motor Feedback

Use Scenario: Monitoring battery voltage and cabin temperature in 12 V vehicle BCMs using resistive divider and NTC networks.

IC Role / Device Role / Timing Role: Dual-channel DC gain block and comparator reference generator.

Use Value: Single 5 V supply operation eliminates need for separate analog rail; −40 °C to +125 °C rating matches under-dash thermal profile.

Use Scenario: Closed-loop speed sensing for BLDC fan motors in refrigerators using back-EMF zero-crossing detection.

IC Role / Device Role / Timing Role: High-Z differential amplifier for motor phase voltage comparison and hysteresis comparator input stage.

Use Value: Input common-mode range including ground allows direct connection to half-bridge outputs; 1.1 MHz bandwidth supports 20 kHz PWM switching harmonics.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2904DT	Same silicon die, SO8 tape-and-reel packaging (vs. tube for LM2904D/N); identical electrical specs and temperature range.	No functional difference - optimized for automated SMT assembly rather than manual prototyping.	Select LM2904DT for volume production; LM2904N implies tube-packaged SO8 variant per ST's ordering table.
LM2904WDT	AEC-Q100 qualified (Grade 1), enhanced ESD (2000 V HBM), lower input offset drift (≤2 µV/°C), and extended V_ID rating (±V_CC).	Required for automotive under-hood applications; not recommended for cost-sensitive consumer products where standard LM2904N suffices.	Choose LM2904WDT when automotive qualification, higher reliability, or tighter drift specs are mandatory.

Compared with LM2904N, LM2904DT offers identical performance in automated manufacturing contexts, while LM2904WDT adds automotive-grade robustness and improved thermal stability - making it essential for safety-critical vehicle subsystems but unnecessary for general-purpose industrial signal conditioning.

Availability

LM2904N is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC analog input modules, consumer appliance motor feedback circuits, and HVAC sensor interface designs requiring stable component supply across extended temperature ranges.

Supply support for LM2904N 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 strong European manufacturing and R&D infrastructure.

The LM2904 product line targets cost-sensitive, high-reliability analog signal conditioning in automotive and industrial environments - emphasizing wide supply range, rail-compatible inputs, and AEC-Q100-compliant variants for under-hood deployment.

FAQ

Is LM2904N suitable for single-supply 3.3 V operation?

No - LM2904N has a minimum supply voltage of 3 V, but its output swing is specified as 0 V to V_CC+ −1.5 V. At 3.3 V supply, maximum output is only ~1.8 V, limiting dynamic range. For true 3.3 V rail-to-rail operation, consider ST's TSZ121 or TLV2462, which specify output swing within 100 mV of rails.

What is the maximum capacitive load LM2904N can drive stably?

LM2904N is stable driving up to 100 pF capacitive load in unity-gain configuration, as verified in Figure 20 of DS0508. Driving >100 pF requires isolation resistor (≥100 Ω) between output and capacitance to maintain phase margin above 45° and prevent oscillation.

Does LM2904N support dual-supply ±15 V operation?

Yes - absolute maximum supply voltage is ±16 V or 32 V total, and operating conditions include V_CC+ = +15 V / V_CC− = −15 V. Electrical characteristics tables confirm performance at ±15 V, including 100 dB gain and 1.1 MHz bandwidth, making it compatible with legacy dual-rail test equipment.

How does LM2904N differ from LM2902 quad op-amp?

LM2904N contains two op-amps in one package; LM2902 contains four. Both share identical per-amplifier specifications (gain, bandwidth, offset, supply current), pin-compatible topology per channel, and same SO8 footprint. LM2902 is preferred when four channels are needed; LM2904N saves board space and power when only two are required.

LM2904N Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: General Purpose

Number of Circuits:: 2

Output Type:: -

Slew Rate:: 0.6V/µs

Gain Bandwidth Product:: 700 kHz

-3db Bandwidth:: -

Current - Input Bias:: 20 nA

Voltage - Input Offset:: 2 mV

Current - Supply:: 700µA

Current - Output / Channel:: 30 mA

Voltage - Supply Span (Min):: 3 V

Voltage - Supply Span (Max):: 30 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-Mini DIP

LM2904N FAQ

1.How can I place an order for LM2904N through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2904N on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM2904N reliable?

The price and inventory of LM2904N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2904N is usually 5 days.

3.What payment methods are accepted for LM2904N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2904N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2904N?

LM2904N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2904N order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM2904N?

For technical support, including LM2904N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2904N requirements.

6.How does Aetrix verify that LM2904N is sourced from the original manufacturer or authorized distributors?

All LM2904N products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2904N meets industry standards.

7.What is the process for return or replacement of LM2904N?

All LM2904N units undergo pre-shipment inspection (PSI). If there is an issue with LM2904N, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM2904N part is unused and in its original packaging.

Return procedure for LM2904N:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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