LM2902KNSRG4 - 26V Quad 1.2MHz Op Amp | Texas Instruments
MPN: LM2902KNSRG4 ✓ ActiveLM2902KNSRG4 Overview
An operational amplifier is an analog integrated circuit that uses high open-loop gain to amplify the difference between two input voltages. In its noninverting configuration it gains a signal applied to the positive input; in its inverting configuration it amplifies the input applied through the feedback network to the negative input. The LM2902K belongs to the hierarchy of operational amplifier, analog amplifier, linear amplifier, and semiconductor, while supporting applications from sensing and filtering to instrumentation and actuator control.
Four independent amplifiers are integrated in one 14-pin SOIC, reducing board area compared with four single-amplifier packages. Each channel is frequency compensated and can operate from a single or split supply. According to the Texas Instruments product page, the device is a quad, 26 V, 1.2 MHz operational amplifier with improved 2 kV ESD protection. The four-channel organization is useful when a system requires several similar low-frequency amplification, buffering, or differential-input functions.
The LM2902 architecture is intended for dependable, cost-conscious general-purpose analog designs rather than precision or high-speed signal chains. Its 1.2 MHz bandwidth supports moderate-frequency closed-loop operation, while the high-gain internal stages help implement common amplifier topologies. Split-supply operation is particularly useful in bipolar sensor circuits, where signals may be centered around 0 V and require both positive and negative output swing.
Typical uses include industrial sensor interfaces, transducer conditioning, loop filtering, audio preamplification, automotive signal processing, and four-channel active filtering. The device can also implement comparators in applications where the response-speed requirements are modest and the input common-mode range is adequate. Each amplifier is independent, allowing unused channels to be configured according to the manufacturer's recommended stability practices.
For PCB design, place the device to minimize noise-sensitive input routing and keep feedback traces short. Decoupling capacitors should be positioned close to the supply pins, while input and feedback paths should avoid nearby switching nodes and high-current return paths. Stable operation depends on choosing the correct feedback network and observing the input common-mode and output-swing limits for the selected supply voltage.
This page organizes the device specifications, replacement options, application guidance, and practical design notes into a concise engineering reference. It also distinguishes true package-compatible alternatives from merely functional equivalents so replacement decisions can be checked against footprint, pinout, and operating requirements.
Drop-in alternatives for LM2902KNSRG4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM2902KNSRG4 (same form factor and footprint) — differing in Automotive Qualification, Package.
LM2902KNSR
✅ Drop-In📋 Reference alternative (not in catalog)
LM2902M/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
NJM2902M
✅ Drop-In📋 Reference alternative (not in catalog)
LM224DT
✅ Drop-InContact for price
View Datasheet →LP2902MX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM2902KNSRG4 Maximum Ratings & Electrical Characteristics
| Number of Amplifiers | 4 circuits |
| Maximum Supply Voltage | 26 V |
| Gain-Bandwidth Product | 1.2 MHz |
| Improved ESD Rating | 2 kV |
| Package | 14-SO |
| Maximum Operating Temperature | 125 C |
| Automotive Qualification | AEC-Q100 qualified |
| Human Body Model ESD | <500 V per MIL-STD-883, Method 3015 |
| Machine Model ESD | 200 V at 200 pF |
| Channel Configuration | 4 independent operational amplifiers |
| Compensation | Internally frequency compensated |
| Supply Configuration | Single or split supply |
| Mounting Type | Surface mount |
LM2902KNSRG4 Pin Configuration
| Pin 1 | OUT1 — Output of amplifier 1 |
| Pin 2 | IN1- — Inverting input of amplifier 1 |
| Pin 3 | IN1+ — Noninverting input of amplifier 1 |
| Pin 4 | V+ — Positive supply terminal |
| Pin 5 | IN2+ — Noninverting input of amplifier 2 |
| Pin 6 | IN2- — Inverting input of amplifier 2 |
| Pin 7 | OUT2 — Output of amplifier 2 |
| Pin 8 | OUT3 — Output of amplifier 3 |
| Pin 9 | IN3- — Inverting input of amplifier 3 |
| Pin 10 | IN3+ — Noninverting input of amplifier 3 |
| Pin 11 | V- — Negative supply terminal or ground in single-supply operation |
| Pin 12 | IN4+ — Noninverting input of amplifier 4 |
| Pin 13 | IN4- — Inverting input of amplifier 4 |
| Pin 14 | OUT4 — Output of amplifier 4 |
Typical Applications
LM2902KNSRG4 is suitable for 6 applications: Industrial Sensor Signal Conditioning, Automotive Signal Processing, Active Audio Preamplification, Four-Channel Active Filtering, Transducer and Bridge Measurement, Data Acquisition Front End.
Industrial Sensor Signal Conditioning
The LM2902KNSRG4 is suitable for conditioning low-frequency industrial sensors because four independent 1.2 MHz amplifiers can provide differential gain, impedance buffering, and active filtering in one 14-pin SOIC. A bridge transducer or resistance-based sensor can feed a differential amplifier, while the remaining channels buffer the reference and implement low-pass stages. The 26 V maximum supply supports higher-voltage industrial interfaces, and split-supply operation allows signals around 0 V without shifting every stage to a mid-supply reference. Design checks should include the sensor excitation range, amplifier input common-mode limits, output swing, and the required amplifier stability with the actual feedback network.
Recommended
Automotive Signal Processing
The LM2902KNSRG4 fits low-frequency automotive signal-processing functions because it is AEC-Q100 qualified, supports a maximum supply voltage of 26 V, and includes improved 2 kV ESD protection. Four channels can process sensor interfaces, actuator feedback, or filtered diagnostic signals within one package. The broad supply range is useful in 12 V vehicle systems, while the four independently compensated amplifiers simplify non-inverting, inverting, and buffer stages. Designers must still confirm the exact orderable suffix, temperature grade, ESD qualification, and operating limits against the vehicle-level requirements rather than treating automotive qualification as automatic approval of the complete system.
Recommended
Active Audio Preamplification
The LM2902KNSRG4 can provide the first gain or buffer stage in a low-frequency audio preamplifier because each channel is an internally compensated operational amplifier with a 1.2 MHz gain-bandwidth product. The quad arrangement permits a stereo input stage plus monitoring or control channels in one 14-pin SOIC. Split supplies support signals centered around 0 V, while single-supply operation requires an appropriate bias reference. Audio performance depends on the selected closed-loop gain, source impedance, load, and supply voltage. Check output swing and drive capability, maintain input and feedback routing away from switching circuitry, and use the manufacturer stability guidance for capacitive loads.
Recommended
Four-Channel Active Filtering
Four independent amplifiers make the LM2902KNSRG4 practical for small active-filter and equalizer networks where separate single-amplifier packages would consume excess board area. Each 1.2 MHz amplifier can implement a first-order low-pass or high-pass stage, or a second-order section when suitable component ratios and buffering are used. The 26 V maximum supply provides flexibility for signal amplitudes and biasing, but component tolerances and amplifier gain-bandwidth limit practical filter accuracy and usable bandwidth. Validate stability, common-mode range, and output swing for the lowest supply voltage and highest channel output, while keeping high-impedance filter nodes away from noisy PCB areas.
Recommended
Transducer and Bridge Measurement
The LM2902KNSRG4 can amplify small differential signals from resistive bridges, strain gauges, and other transducers when the excitation and output levels remain inside the amplifier's input and output limits. Two channels can form a differential amplifier, while the others buffer excitation or reference nodes and perform gain shaping. The 1.2 MHz bandwidth is more than adequate for many slow sensors and helps preserve phase behavior in modest-bandwidth filters. Precision designs should verify offset voltage, bias current, noise, and common-mode behavior because those values are not established by the headline bandwidth and supply ratings. A dedicated instrumentation amplifier may be preferable when very low offset or high precision is essential.
Recommended
Data Acquisition Front End
The LM2902KNSRG4 can form the analog conditioning front end of a low-speed data-acquisition system by providing channel multiplexing through sequential amplifier use, signal amplification, and active filtering. Its four independent channels allow differential measurement, reference buffering, and auxiliary conditioning within one compact package. The 26 V supply capability accommodates higher-range sensor interfaces, and the 1.2 MHz gain-bandwidth product supports signals well above typical slow sensor bandwidths. System accuracy still depends on gain error, offset, bias current, common-mode range, and ADC input loading. Use short, guarded input traces and bypass capacitors near the supply pins to reduce errors before conversion.
Recommended
Recommended Products Summary
Engineering reference data for LM2902KNSRG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM2902KNSR | LM2902M/NOPB | NJM2902M | LM224DT | LP2902MX/NOPB |
|---|---|---|---|---|---|---|
| Package | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | New Japan Radio | Texas Instruments | Texas Instruments |
| Number of Amplifiers | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
Key Differentiators
- Four-channel integration in one 14-pin SOIC (vs LM224DT)
- Headline 1.2 MHz bandwidth and 26 V supply capability (vs LP2902MX/NOPB)
- Improved 2 kV ESD rating with AEC-Q100 qualification (vs NJM2902M)
Design Notes
Route the four noninverting inputs, four inverting inputs, and four outputs directly to their intended circuit locations, with short feedback traces and no copper or fast-switching nodes beneath sensitive inputs. Place supply bypass capacitors adjacent to pins 4 and 11, and connect their ground returns through a low-impedance path. Because the SOIC has only two supply terminals shared by four amplifiers, careful decoupling is especially important when more than one channel drives a low-impedance load.
Do not treat the 26 V maximum supply rating as the required operating supply for every amplifier function. Check the input common-mode range, output swing, and channel behavior at the lowest voltage used in the design. In single-supply operation, bias inputs and references within the allowable common-mode region; in split-supply operation, verify that negative and positive rail limits are not exceeded. Confirm that the selected feedback ratio provides stable operation at the intended noise gain.
The 14-pin SOIC has shared supply pins for all four channels, so current from simultaneously active amplifiers and the load must remain within the package and thermal limits. Keep copper area around the device adequate for heat dissipation and use local high-frequency bypass capacitors with low-ESR traces. Do not add a large capacitor directly across the package pins unless the manufacturer's stability guidance supports it; excessive supply capacitance combined with output isolation may create oscillation risk.
Compliance Information
The manufacturer product information identifies the LM2902K family as AEC-Q100 qualified for automotive applications. No explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals statement appears in the cited source material.