LM2902DRG4 - Quad 26V 1.2MHz Op Amp | Texas Instruments
MPN： LM2902DRG4 ✓ 啟用中LM2902DRG4 概覽
An operational amplifier is an analog integrated circuit that uses differential feedback to amplify the difference between two input voltages. The LM2902 belongs to the operational-amplifier hierarchy, where it combines transistor-level input and output stages with internal compensation. Each of its four channels can perform amplification, buffering, comparison, summation, differential sensing, or active-filter functions without requiring a separate amplifier for every signal path.
The device provides a 1.2 MHz gain-bandwidth product and a 2 mV input-offset specification, making it suitable for moderate-bandwidth precision applications. The 26 V supply capability also supports higher-voltage industrial interfaces than low-voltage rail-to-rail amplifiers. Texas Instruments specifies an operating temperature range from -40°C to 125°C, allowing operation across demanding commercial and industrial environments.
The four amplifiers share one package while retaining independent input and output pins, allowing one IC to implement several analog functions. Their typical design role is to operate with feedback networks that establish closed-loop gain and filtering. Because the device is not rail-to-rail by specification, input and output common-mode limits must be checked against the selected supply voltage and signal range before layout release.
Typical uses include transducer signal conditioning, low-frequency active filters, sensor amplifiers, industrial control loops, comparator-style threshold circuits, and audio or communications interface stages. The SOIC package also simplifies inspection and rework on through-hole industrial boards while providing a familiar 14-pin land pattern.
For a new design, verify the input and output common-mode range, output-current capability, load impedance, and supply operating limits at the intended signal amplitude. Stable feedback and proper decoupling remain important even when the application is a unity-gain buffer, so use the manufacturer pin-description table when assigning PCB tracks.
This page organizes the LM2902DRG4 specifications, verified manufacturer references, same-package alternatives, application guidance, and comparison points. It also highlights the practical checks needed to determine whether a candidate replacement is truly pin-compatible rather than merely functionally similar.
直接替換替代品，適用於 LM2902DRG4 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM2902DRG4 （相同外形與佔位） — 差異在於 Amplifier Type, Input Offset Voltage, Package.
LM2902KDR
✅ 直接替換📋 參考替代品（不在目錄中）
LM2902KDRE4
✅ 直接替換📋 參考替代品（不在目錄中）
LM2902B
✅ 直接替換📋 參考替代品（不在目錄中）
LM324BAIDR
✅ 直接替換聯絡詢價
查看資料表 →LM2902DRG4 最大額定值與電氣特性
| Number of Amplifier Channels | 4 channels |
| Maximum Supply Voltage | 26 V |
| Gain-Bandwidth Product | 1.2 MHz |
| Input Offset Voltage | 2 mV |
| Minimum Common-Mode Rejection Ratio | 50 dB |
| Typical Supply Current | 0.8 mA |
| Single-Supply Maximum Voltage | 26 V |
| Dual-Supply Maximum Voltage | +13 V |
| Minimum Operating Temperature | -40°C |
| Maximum Operating Temperature | 125°C |
| 封裝 | SOIC-14 (D) |
| 腳位數 | 14 pins |
| 安裝類型 | Surface mount |
| Amplifier Type | General-purpose operational amplifier |
LM2902DRG4 soic-14 (d) 腳位配置指南
LM2902DRG4（soic-14 (d) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM2902DRG4.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM2902DRG4 適用於 6 應用s: Industrial Sensor Signal Conditioning, Active Audio and Control Filtering, Precision Threshold Detection, Data Acquisition Front Ends, Communication Interface Conditioning, Portable and Battery-Powered Instruments.
Industrial Sensor Signal Conditioning
The LM2902DRG4 is suitable for conditioning low-frequency industrial sensor signals because its four channels can amplify several inputs without using separate amplifier packages. The 2 mV input-offset specification and 50 dB minimum common-mode rejection ratio help preserve weak sensor information, while the 1.2 MHz gain-bandwidth product supports moderate closed-loop bandwidth. Use one channel for the sensor input, another for gain or filtering, and confirm that the sensor output remains inside the amplifier's common-mode range. A 26 V maximum supply also permits operation from industrial rails when the overall design otherwise remains within the device's electrical limits.
推薦
Active Audio and Control Filtering
The LM2902DRG4 can implement active low-pass, high-pass, or band-pass stages where the required bandwidth is well below its 1.2 MHz gain-bandwidth product. Four independently fed-back channels allow a compact implementation of cascaded or parallel filters, which is useful in audio, communications-interface, and industrial control equipment. The 0.8 mA typical supply-current figure helps limit power demand in multi-channel systems. Component tolerances and the op-amp's finite gain-bandwidth should be included in filter calculations, while the output must remain within the device's load and swing capabilities.
推薦
Precision Threshold Detection
The LM2902DRG4 can serve as a threshold amplifier or comparator-like stage in control and instrumentation systems, with two channels handling reference conditioning and two handling the sensed signals. Its 2 mV input-offset specification defines the baseline accuracy around which the threshold decision is made, and the 50 dB minimum common-mode rejection ratio reduces differential interference. Operation remains limited by input and output common-mode ranges, so the threshold reference must be designed around the selected supply voltage. A pullback or pull-up arrangement at the output may also be needed when the next stage requires a logic-compatible voltage.
推薦
Data Acquisition Front Ends
The LM2902DRG4 is appropriate for buffering and amplifying moderate-bandwidth signals at the input of a data-acquisition system. Four channels can handle separate sensor lines, while the 1.2 MHz gain-bandwidth product provides useful margin below the bandwidth of many low-speed measurement systems. The 26 V maximum supply capability supports interface designs operating above conventional low-voltage analog rails, provided the signal and output levels remain compliant. Layout should minimize input-node capacitance and use a stable reference return because excessive loading or ground offset can directly affect acquisition accuracy.
推薦
Communication Interface Conditioning
The LM2902DRG4 can provide gain, level conditioning, and impedance buffering in low-speed communication interface circuits. Its four-channel organization is useful for differential receiver stages, transmit-driver support circuits, and threshold-recovery functions. The 1.2 MHz gain-bandwidth product is appropriate for many baseband and control signals rather than high-speed data links, and the 2 mV offset specification helps maintain a predictable transition point. Designers should verify common-mode limits against the line voltage, use short feedback paths, and avoid driving capacitive loads that could cause instability.
推薦
Portable and Battery-Powered Instruments
The LM2902DRG4 can serve low-frequency instrumentation in portable equipment when its supply and common-mode requirements fit the available battery-derived rail. The typical 0.8 mA supply-current specification supports low system overhead, while four amplifiers reduce the package count compared with four single-channel devices. Because the maximum supply rating is 26 V, the device is particularly useful in industrial or instrument designs with a protected higher-voltage rail rather than in the lowest-power portable systems. A regulator should provide local decoupling, and unused channels should be configured according to the manufacturer guidance.
推薦
工程參考資料，適用於 LM2902DRG4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM2902KDR | LM2902KDRE4 | LM2902B | LM324B |
|---|---|---|---|---|---|
| Package | SOIC-14 (D) | SOIC-14 (D) | SOIC-14 (D) | SOIC-14 (D) | SOIC-14 (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Manufacturer Drop-In Relationship | LM2902 family | Identified as a similar 14-pin SOIC device | Identified as a similar 14-pin SOIC device | Manufacturer states LM2902B can drop in for LM2902 versions | Manufacturer states LM324B can drop in for LM2902 versions |
主要差異化特點
- Four general-purpose amplifiers in one 14-pin package (對比LM2902KDR)
- Manufacturer-supported family replacement path (對比LM2902B)
- Broader supply capability through the related family (對比LM324B)
設計說明
Verify the actual rail voltage and signal levels against the 26 V maximum supply specification before energizing the board. The LM2902 is not described as rail-to-rail, so input common-mode and output-swing limits can restrict operation even when the supply itself is valid. Place the device's supply-decoupling capacitor close to the package and keep sensitive feedback and reference traces away from switching-current paths.
Assign PCB connections from the manufacturer pin-description table rather than inferring channel order from the SOIC outline. Keep each op-amp's feedback components close to its output and inverting-input pins, and avoid routing high-current or digital signals beneath the analog package. A solid ground plane and short ground returns reduce offset and common-mode errors in multi-channel sensor-conditioning circuits.
Do not treat the 1.2 MHz gain-bandwidth product as the usable closed-loop bandwidth for every gain setting. Higher closed-loop noise gain reduces bandwidth and phase margin, while large capacitive loads can cause oscillation. Confirm stability using the manufacturer's stability and output-capacitance guidance, and avoid leaving an amplifier channel's inputs floating.
For low-level sensor inputs, keep the input node physically small and protect it from leakage, contamination, and nearby switching nodes. Input-bias-current effects become more important with high source impedances even when the 2 mV offset specification is suitable. Use guarding or a differential input arrangement where offset drift and bias-current error could obscure the measured signal.
合規資訊
The cited manufacturer and distributor pages do not explicitly state the requested compliance statuses for LM2902DRG4. Confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status using the current Texas Instruments product documentation before release.
