LM2904AS-13 - Dual Precision Op Amp | Diodes Inc.
MPN: LM2904AS-13 ✓ ActiveLM2904AS-13 Overview
An operational amplifier is a high-gain analog signal-conditioning IC used to amplify voltage differences, buffer sensor outputs, implement active filters, and serve as the input stage of control and measurement systems. In the broader semiconductor hierarchy, the LM2904 belongs to the amplifier IC family, specifically low-power general-purpose operational amplifiers designed for single or dual supply operation.
The two-channel configuration lets one package support independent signal paths while reducing board area and the number of required components. A 100 dB open-loop gain supports accurate amplification of small signals, while the 1.1 MHz gain-bandwidth product provides useful bandwidth for common low-frequency and moderate-frequency analog tasks. The stated 20 nA input bias current is particularly relevant when the source impedance is high.
The 3 V to 36 V supply span permits operation from conventional single-supply rails through higher industrial supply voltages. Its specified 1 mV input offset supports applications where input-referred error must be controlled relative to the signal level. The -40°C to +125°C characterization provides a broad temperature range for industrial equipment, instrumentation, automotive-adjacent circuitry, and other systems requiring stable operation over extended environmental conditions.
Typical uses include transducer-signal conditioning, active audio and control paths, low-frequency filter stages, sensor amplification, and general dual-amplifier circuits. The SO-8 package is suitable for conventional surface-mount assembly, and the manufacturer states that the LM2904/LM2902 family uses green mold compound as standard.
When laying out a circuit, keep input and feedback paths short, provide stable bypassing close to the supply pins, and confirm common-mode and output-swing limits at the selected supply voltage and load. Decoupling capacitors should be placed using standard op-amp layout practice to minimize parasitic feedback and unstable operation.
This product page combines the manufacturer specification summary, distributor identification, lifecycle-relevant sourcing information, and practical application guidance. It also documents the verified limits of the available drop-in comparison set so engineers can distinguish confirmed same-footprint choices from related LM2904-family devices that require package or qualification review.
Drop-in alternatives for LM2904AS-13 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesLM2904AS-13 Maximum Ratings & Electrical Characteristics
| Amplifier Type | Dual operational amplifier |
| Number of Channels | 2 channels |
| Supply Voltage Range | 3 V to 36 V |
| Open-Loop Gain | 100 dB |
| Gain-Bandwidth Product | 1.1 MHz |
| Input Bias Current | 20 nA |
| Input Offset Voltage | 1 mV |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-SO |
| Pin Count | 8 pins |
| Mounting Type | Surface mount |
| Mold Compound | Green mold compound |
LM2904AS-13 8-so Pin Configuration Guide
Pin configuration for LM2904AS-13 (8-so package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LM2904AS-13.
Refer to the datasheet for full pin configuration.
Typical Applications
LM2904AS-13 is suitable for 6 applications: Industrial Sensor Signal Conditioning, Precision Buffering and Level Conditioning, Active Low-Frequency Filters, Process Control Loop Amplification, Audio and Instrumentation Signal Paths, Power Supply Feedback and Monitoring.
Industrial Sensor Signal Conditioning
The LM2904AS-13 fits two-channel industrial sensor conditioning when the source signals require modest amplification before conversion or control. Its two amplifiers occupy one 8-SO package, while the stated 100 dB open-loop gain supports accurate recovery of low-level analog voltages. The 20 nA input bias current limits reference-induced error when working with relatively high-impedance sensors, and the 1 mV input offset establishes a useful baseline for bridge, buffer, and amplifier stages. Its 3 V to 36 V supply range supports both compact low-voltage electronics and higher-voltage industrial systems. Keep sensor inputs away from switching nodes, use short feedback paths, and confirm the input common-mode and output-swing limits against the chosen supply voltage.
Recommended
Precision Buffering and Level Conditioning
The LM2904AS-13 is suitable for buffering sensor or divider outputs where loading must not distort the source signal. Two independent channels in the 8-SO package can handle separate analog signals, and the 100 dB open-loop gain helps preserve signal integrity at low frequencies. Its 20 nA input bias current is important when the preceding network has a high output impedance, while the 1 mV input offset sets the error floor for close-to-unity-gain voltage-following configurations. The 3 V to 36 V operating span provides flexibility across compact control boards and industrial instrumentation. Place the input directly at the relevant channel pins, keep the feedback loop compact, and bypass the supply pins locally to avoid converting supply noise or board-current transients into output errors.
Recommended
Active Low-Frequency Filters
The LM2904AS-13 can implement first- and second-order active filter stages when signal bandwidth remains within its 1.1 MHz gain-bandwidth product. Two channels in one 8-SO package are useful for cascaded low-pass, high-pass, or band-pass sections, and the 100 dB open-loop gain provides loop gain for accurate inverting and non-inverting responses. Its 1 mV input offset and 20 nA input bias current should be considered when setting the smallest signal levels and resistor impedances. The broad 3 V to 36 V supply range supports filter cards operating from low-voltage logic rails through industrial analog systems. Select resistor and capacitor values for the intended corner frequency, keep the feedback network close to the device, and ensure the stage remains stable with the chosen gain and capacitive loading.
Recommended
Process Control Loop Amplification
The LM2904AS-13 is applicable in process-control front ends where a controller requires amplified error or feedback signals. Its two channels can support a measurement amplifier and controller-interface stage within one 8-SO package. The 100 dB open-loop gain is useful around unity-gain or moderate-gain closed-loop operation, and the 1.1 MHz bandwidth supports the dynamics of many slow industrial control loops. A 3 V to 36 V supply range allows use in compact electronic controllers as well as higher-voltage instrumentation, with characterization from -40°C to +125°C supporting extended-temperature designs. Check the common-mode range for the selected feedback topology, provide stable compensation for capacitive loads, and route high-energy actuator or switching circuitry away from the precision amplifier inputs to prevent coupled noise from obscuring the control signal.
Recommended
Audio and Instrumentation Signal Paths
The LM2904AS-13 can handle low-frequency audio or instrumentation paths that do not require the bandwidth of a high-speed precision amplifier. The dual-channel 8-SO package provides a compact implementation for input stages, active equalizer sections, or cross-coupled analog circuits. Its 1.1 MHz gain-bandwidth product covers many human-audio-bandwidth and general measurement applications, while the 100 dB open-loop gain supports accurate closed-loop amplification. The input offset of 1 mV and bias current of 20 nA influence the minimum useful signal level, particularly with high source impedances. Its 3 V to 36 V supply range allows operation from low-voltage portable-equipment rails to higher-voltage analog systems. Use stable feedback components, minimize trace length around the amplifier, and place supply bypass capacitors adjacent to the device.
Recommended
Power Supply Feedback and Monitoring
The LM2904AS-13 can compare a scaled supply voltage against a reference and amplify the difference for monitoring or fault detection. Two amplifier channels allow separate sensing and conditioning functions in an 8-SO package, while the 100 dB open-loop gain is helpful when high loop gain is required around a regulator stage. Its 3 V to 36 V supply span permits connection to systems operating above conventional 5 V and 12 V rails, although the signal at each input must remain within the device's common-mode limits. The 1 mV input offset and 20 nA input bias current define practical limits for detecting small supply deviations. Keep the high-voltage or switching node outside the sensitive feedback trace, use high-value divider resistors only after checking bias-current error, and follow the manufacturer's recommended bypass and layout practices.
Recommended
Recommended Products Summary
Engineering reference data for LM2904AS-13 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Diodes Incorporated |
| Package | 8-SO |
| Amplifier Configuration | Dual |
| Supply Voltage Range | 3 V to 36 V |
| Open-Loop Gain | 100 dB |
| Gain-Bandwidth Product | 1.1 MHz |
| Input Bias Current | 20 nA |
| Input Offset Voltage | 1 mV |
| Operating Temperature Range | -40°C to +125°C |
Key Differentiators
- Combines two amplifier channels in one compact package (vs LM2904P3)
- Supports a broad supply-voltage operating span (vs LM2904PW)
- Combines precision gain with practical low-frequency bandwidth (vs LM2904AS-13)
Design Notes
Place the input, output, and feedback connections close to the corresponding LM2904AS-13 pins, and route the two channels to minimize shared-impedance coupling. Keep the feedback loop compact and avoid routing it beneath or parallel to high-current switching paths. Connect local supply bypass capacitance directly to the supply pins according to the manufacturer layout recommendations. These practices reduce parasitic feedback, ground-current errors, and switching-noise pickup, which are especially important when the 1 mV input offset and 20 nA input bias current define the usable precision of the signal path.
Do not assume that the 3 V to 36 V supply rating means the amplifier can accept inputs across that complete range. Check the common-mode input range and output-swing limits in the Diodes Incorporated LM2904/LM2902 datasheet for the actual supply voltage. Likewise, verify the maximum input differential voltage before applying large transient differences. For precision measurements, include the 1 mV input offset in the error budget and select feedback resistor values so their thermal noise and generated current do not make the 20 nA input bias current the dominant error.
Use the 1.1 MHz gain-bandwidth product to select a feedback network that preserves stability at the required signal frequency. Avoid excessive capacitive loading directly on the amplifier output, particularly in unity-gain voltage followers, because it can introduce oscillation. If the application requires driving a long cable, capacitive load, or ADC input, use isolation resistors, a suitable compensation capacitor, or an additional buffer stage. Validate the complete layout with the intended source impedance, load, supply decoupling, and temperature range rather than testing only an isolated amplifier circuit.
Compliance Information
The manufacturer states that the LM2904/LM2902 family uses green mold compound as standard, but no specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was identified for this exact order code.