LM2904MX - Dual 26V 700kHz Operational Amplifier | TI
Référence : LM2904MX ✓ ActifLM2904MX Présentation
An operational amplifier is a high-gain analog building block used to amplify voltage differences, buffer inputs, perform comparisons, drive external loads, and implement active filters. Within the broader semiconductor hierarchy, the LM2904MX belongs to the operational-amplifier family, which falls under analog ICs and signal-conditioning semiconductors. Unlike precision or rail-to-rail amplifiers, the LM2904 is intended primarily for conventional supply-based operation and general-purpose applications.
The principal features of the LM2904MX include two amplifier channels, an 8-SOIC package, a 700 kHz gain-bandwidth product, and operation from a single supply as high as 26 V. The device is internally frequency compensated, which allows operation at unity gain without an external compensation network. A typical slew rate is 0.3 V/us, making the amplifier appropriate for low-frequency analog processing rather than high-speed signal conditioning. The dual configuration also provides cost and board-area efficiency when a design needs two independent amplifier functions.
Each channel can support feedback-based amplifier configurations such as non-inverting amplifiers, inverting amplifiers, voltage followers, summing circuits, and active filters. The LM2904MX is useful when signals must be conditioned with external resistors or capacitors and the application does not require the very low offset, low noise, high speed, or rail-to-rail input and output behavior associated with more specialized amplifier families. Its wide supply-voltage capability also permits operation from industrial-style elevated rails, subject to the device ratings.
Typical applications include industrial control and instrumentation, sensor signal conditioning, power-supply feedback monitoring, audio and communications interface circuits, active filtering, and general-purpose analog buffers. In a 24 V industrial system, the 26 V maximum supply rating leaves little margin for transient overshoot, so input protection and rail clamping should be considered. The dual channels can serve separate signal paths, but designers should not assume that the two amplifiers share an output or that short-circuit protection makes unlimited current available.
Design attention should focus on the input common-mode range, output swing, output-current capability, stability with the intended load, and the power dissipation created by the supply-to-output voltage difference. Place the device close to feedback and bypass components, use a local supply bypass capacitor, and route high-impedance input nodes with minimal parasitic capacitance. Verify operation across supply voltage, temperature, output load, and source resistance because these conditions affect common-mode range, output swing, and amplifier stability.
This page combines manufacturer specifications, package details, drop-in alternatives, application guidance, and design checks to support component selection and PCB implementation. It also highlights the distinctions between the LM2904MX and commonly encountered LM2904 order codes so engineers can confirm electrical behavior, package compatibility, and assembly requirements before approving a replacement.
Alternatives de remplacement direct pour LM2904MX — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LM2904MX (même facteur de forme et même empreinte) — différant par Amplifier Type, Package.
LM2904MX/NOPB
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM2904DR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM2904M/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM2904MX Valeurs maximales et caractéristiques électriques
| Amplifier Type | General-purpose operational amplifier |
| Number of Circuits | 2 circuits |
| Number of Amplifiers | 2 independent amplifiers |
| Supply Voltage Maximum | 26 V |
| Single-Supply Operating Range | 3 V to 32 V |
| Gain-Bandwidth Product | 700 kHz |
| Slew Rate | 0.3 V/us |
| Large DC Voltage Gain | 100 dB |
| Compensation | Internally frequency compensated |
| Boîtier | 8-SOIC |
| Package Width | 3.90 mm |
| Package Body Width | 0.154 |
| Type de montage | Surface Mount |
| Packaging | Tape and Reel (TR) |
Guide de configuration des broches du LM2904MX 0.154
Configuration des broches du LM2904MX (boîtier 0.154). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour LM2904MX.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
LM2904MX convient pour 6 applications: Industrial Sensor Signal Conditioning, Power-Supply Feedback Monitoring, Active Audio and Communications Filtering, Transducer and Bridge Amplifier Front Ends, Control-System Error and Drive Amplifiers, Data Acquisition and Instrumentation Buffering.
Industrial Sensor Signal Conditioning
The LM2904MX fits low-frequency industrial sensor conditioning because its two independent channels can support active gain, filtering, or buffering functions around sensor outputs. Its 700 kHz gain-bandwidth product provides useful bandwidth for many pressure, temperature, and position-sensing interfaces, while the typical 0.3 V/us slew rate is adequate for moderate-amplitude signals. The internally compensated architecture simplifies unity-gain voltage followers. In a 24 V installation, engineers should account for supply transients, verify the input common-mode range at the actual signal level, and confirm that the output remains within the amplifier swing. The two channels must be treated as independent and each output must remain within its current and stability limits.
Recommandé
Power-Supply Feedback Monitoring
The LM2904MX can monitor and condition a power-supply feedback node using one channel as a buffered reference follower and the second channel for error amplification or comparator-related functions. Its single-supply capability and 26 V class device rating suit elevated industrial rails, while internal frequency compensation avoids an external nulling network. The design must keep the monitored node inside the common-mode input range and provide a stable reference for the error amplifier. Because power-supply ripple can contain fast transients, layout should keep feedback traces short, bypass the supply pins locally, and avoid routing high-current switching paths beneath the analog input. Thermal dissipation also matters when the amplifier output sits well below the supply voltage.
Recommandé
Active Audio and Communications Filtering
The LM2904MX is suitable for low-frequency audio or communications filtering where two channels can implement independent first- or second-order active stages. Its 700 kHz gain-bandwidth product provides margin for filters whose corner frequencies are well below the amplifier bandwidth, and the internally compensated design reduces the need for external compensation. Gain and noise remain dependent on the feedback resistors and source impedance, so component tolerances determine channel matching and cutoff accuracy. Keep the filter in its linear operating region, confirm output-current requirements for the next stage, and avoid driving long capacitive cable loads directly. For higher-bandwidth filters, rail-to-rail precision amplifiers may provide better dynamic range and common-mode flexibility.
Recommandé
Transducer and Bridge Amplifier Front Ends
The LM2904MX can serve as a general-purpose front-end amplifier for resistive transducers and bridge-based sensors when the required bandwidth and common-mode range are compatible. The dual-channel arrangement can amplify the bridge output and buffer a reference or temperature signal in the same package. Its 700 kHz gain-bandwidth product supports many low-frequency measurement paths, while the 0.3 V/us slew rate helps preserve low-frequency transient response. Engineers should verify excitation-heating errors, sensor output impedance, and amplifier input bias effects because resistor-network noise and offset can dominate. Keep sensitive input traces short, provide adequate supply bypassing, and select precision resistors when gain accuracy or common-mode rejection is more important than cost.
Recommandé
Control-System Error and Drive Amplifiers
The LM2904MX is useful in slower control loops where one channel forms a voltage-amplifying error path and the other buffers a command or feedback signal. Its internal frequency compensation allows conventional closed-loop configurations, and the two-channel package reduces component count in dual-loop or multi-axis systems. Closed-loop bandwidth should be kept substantially below the 700 kHz gain-bandwidth product, with additional phase-margin analysis required for highly capacitive loads or complex plant models. For 24 V actuator-control systems, verify output-current capacity, saturation recovery, common-mode range, and power dissipation. Faster or more precise loops may benefit from rail-to-rail amplifiers with wider output swing and shorter settling behavior.
Recommandé
Data Acquisition and Instrumentation Buffering
The LM2904MX can buffer medium-impedance sensor sources before an ADC or perform intermediate gain and filtering in laboratory and industrial instrumentation. A 700 kHz gain-bandwidth product supports moderate-bandwidth signals, while the dual-channel configuration allows simultaneous handling of a measurement and reference channel. The amplifier should be selected only when its input bias current, offset, noise, and common-mode range suit the source impedance. Place the device near the source or ADC, keep input nodes short, and avoid adding capacitance between a high-impedance input and ground. Use local supply bypassing and compare the output drive against the ADC sampling network. For high-resolution measurement, a dedicated low-noise amplifier may produce better results than a general-purpose device.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM2904MX — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM2904MX/NOPB | LM2904DR | LM2904M/NOPB |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Amplifier Type | General-purpose operational amplifier | General-purpose operational amplifier | General-purpose operational amplifier | General-purpose operational amplifier |
| Number of Circuits | 2 circuits | 2 circuits | 2 circuits | 2 circuits |
| Compensation | Internally frequency compensated | Internally frequency compensated | Internally frequency compensated | Internally frequency compensated |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
Principaux différenciateurs
- Two independent general-purpose amplifiers in one package (vs LM2904MX/NOPB)
- Defined 700 kHz gain-bandwidth product for the LM2904 family (vs LM2904DR)
- Typical 0.3 V/us slew rate suits general low-frequency analog signals (vs LM2904M/NOPB)
Notes de conception
Estimated: amplifier power dissipation is approximately P = (VIN - VOUT) × ILOAD. For example, 24 V supply, 5 V output, and 20 mA load produce about 380 mW. The 8-SOIC package therefore needs adequate copper and airflow when operating continuously at elevated supply voltage. Confirm the operating ambient temperature, package thermal resistance, output-current limit, and maximum junction rating in the manufacturer documentation before approving the layout.
Place the supply bypass capacitor and amplifier output components close to their associated pins. Keep feedback resistors and high-impedance input paths short to reduce parasitic capacitance and susceptibility to injected noise. For stable operation, use the manufacturer's recommended source and load conditions, avoid long capacitive output traces, and add an isolation resistor when driving an ADC, cable, or other capacitive input that could upset loop stability.
Do not assume that the full 3 V to 32 V family description permits operation at 32 V for the LM2904MX; the TI product page identifies the LM2904 as a 26 V device. Also verify input common-mode range and output swing at the selected supply voltage, since a valid supply voltage alone does not place every input or output level inside the linear operating region. Use a resistor divider and protection clamp when sensing a higher-voltage node.
Separate sensitive analog inputs from supply-current paths and switching nodes. Place a local bypass capacitor at the amplifier supply pins, provide a low-impedance ground return, and keep both channels away from heat sources and regulators that generate high-frequency ripple. If the device monitors a feedback node in a switching power supply, use differential routing where practical and verify the common-mode transient margin, not only the nominal voltage.
Informations de conformité
The LM2904MX/NOPB suffix suggests a distinct environmental ordering option, but no explicit LM2904MX RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 statements were established. Use the manufacturer product page and current order-code documentation for compliance decisions.
