OPA234P - Low-Power Precision Dual Op Amp | Texas Instruments
料号： OPA234P ✗ 停产OPA234P 概述
An operational amplifier is a voltage-controlled differential amplifier used to amplify, buffer, filter, compare, or drive analog signals. The OPA234 belongs to the operational-amplifier hierarchy and is positioned as a low-power, precision single-supply amplifier. Its dual-channel configuration reduces component count when an application needs matched amplifier stages, while the wide supply range permits operation from low-voltage systems through conventional analog laboratory rails.
The verified manufacturer data identifies three principal advantages: a wide supply range, guaranteed performance at +2.7 V, +5 V, and ±15 V, and low quiescent current of 250 µA per amplifier. The exact offset, bandwidth, slew-rate, input-noise, common-mode-range, and output-current figures are not included in the supplied excerpts and therefore require confirmation from the manufacturer datasheet before precision sizing.
OPA234P uses the OPA234-series architecture intended for low-cost, low-voltage, and low-power applications. According to the supplied TI application material, the series combines low offset voltage, high common-mode rejection, high power-supply rejection, and a wide supply range. These characteristics make the device applicable to precision current sensing, instrumentation, sensor signal conditioning, buffering, and active filtering where low supply current and usable single-supply operation are important.
Typical applications include battery-powered instrumentation, temperature and pressure sensor interfaces, low-level analog signal conditioning, audio and communication buffers, and active filters. In each case, the OPA234P supplies two amplifier channels in one package, allowing a compact dual-stage architecture without requiring two separate amplifier packages.
Designers should verify the complete input common-mode range, output swing, input bias current, offset voltage, frequency response, and stability requirements against the exact operating supply and load. Decoupling and layout should follow the datasheet recommendations, particularly when driving capacitive loads or operating close to the output-swing limits.
This product record combines verified source details, application guidance, replacement analysis, and practical design cautions. It clearly separates confirmed specifications from unavailable parameters so engineers can review the manufacturer datasheet before making precision signal-chain decisions.
直接替换替代料： OPA234P ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
OPA234UG4
✅ 直接替换📋 参考替代料（不在目录中）
OPA234U
✅ 直接替换📋 参考替代料（不在目录中）
OPA234P 最大额定值与电气特性
| Amplifier Type | Dual precision operational amplifier |
| Number of Channels | 2 channels |
| Supply Voltage Range, Single Supply | Up to +36 V |
| Supply Voltage Range, Dual Supply | ±18 V |
| Guaranteed Performance Supplies | +2.7 V, +5 V, and ±15 V |
| 静态电流 | 250 µA per amplifier |
| 封装 | 8-PDIP |
| 安装类型 | Through-hole |
| Temperature Grade | Industrial |
| Number of Terminals | 8 terminals |
| Package Shape | Rectangular |
OPA234P rectangular 引脚配置指南
OPA234P（rectangular 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： OPA234P.
请参阅 数据手册 以查看完整引脚配置。
典型应用
OPA234P 适用于 6 应用s: Battery-Powered Sensor Interfaces, Precision Instrumentation Amplification, Temperature and Pressure Transducer Signal Conditioning, Low-Power Active Filters, Communications Line Interface Buffing, Audio and Communication Buffers.
Battery-Powered Sensor Interfaces
OPA234P fits battery-powered sensor interfaces because each precision amplifier consumes only 250 µA of quiescent current and the family supports single supplies up to +36 V. The two channels can form a complete low-power conditioning path, such as an instrumentation front end followed by an active filter or output buffer. Using one 8-PDIP package can reduce board area relative to two separate single amplifier packages. Before finalizing the circuit, verify the input bias current and common-mode range against the sensor output. A high-impedance transducer may require the amplifier's bias-current behavior to be included in the total error budget, while a sensor operating near 0 V may require a mid-supply bias network. Confirm stability, output swing, and load drive from the complete manufacturer datasheet.
推荐
Precision Instrumentation Amplification
OPA234P is appropriate for precision instrumentation front ends that require two amplifier channels and operate from +2.7 V, +5 V, or ±15 V. One channel can provide gain while the second supports filtering, buffering, or reference conditioning. The verified TI series description highlights low offset voltage, high common-mode rejection, and high power-supply rejection, all important when small sensor signals pass through long analog paths. Because the supplied excerpt does not state numerical offset, noise, or common-mode limits, engineers must use the manufacturer tables to calculate input-referred error and ensure the signal remains inside the usable common-mode range.
推荐
Temperature and Pressure Transducer Signal Conditioning
OPA234P can condition the low-level outputs of resistive temperature and pressure transducers where low power, dual-channel integration, and single-supply operation are valuable. One amplifier may amplify the bridge or sensor signal, while the second can generate a reference, filter the result, or buffer it into an ADC input. Its 250 µA-per-amplifier quiescent current is particularly helpful when the sensor platform operates from a small battery. The critical checks are bridge excitation current, input offset relative to sensor sensitivity, common-mode range, and output swing. A practical design should also include input protection and verify whether the transducer requires a dedicated low-noise reference.
推荐
Low-Power Active Filters
OPA234P suits active-filter and analog equalizer stages where two amplifier channels are needed for a Sallen-Key or multiple-feedback topology. Its specified 250 µA quiescent current per channel helps limit power consumption in battery-operated audio, communications, and test equipment. The same 8-PDIP package also simplifies through-hole assembly where SMT is not required. Filter accuracy depends on the exact gain-bandwidth product, slew rate, open-loop response, and stability behavior, none of which are quantified in the supplied search excerpts. Those parameters must be read from the datasheet before selecting component values, especially when filtering fast signals or operating at very low frequencies.
推荐
Communications Line Interface Buffing
OPA234P can provide impedance buffering and gain stages around low-speed communications equipment, particularly where low supply current and a dual-amplifier package reduce circuit complexity. The device operates from a single +2.7 V supply up to +36 V, enabling use in compact portable systems as well as higher-voltage industrial interfaces. The OPA234 family is described by TI as offering low offset, high common-mode rejection, and high power-supply rejection, which supports signal integrity in noisy environments. For actual line-rate use, verify bandwidth, slew rate, output swing, capacitive-load stability, and common-mode limits against the communications standard being implemented.
推荐
Audio and Communication Buffers
OPA234P is suitable for buffering or gain stages in audio and communications equipment that prioritizes low quiescent current over high-bandwidth performance. Two channels in one 8-PDIP package can implement stereo buffering, microphone preamplification, or balanced signal conditioning when the operating frequency is within the amplifier's verified bandwidth. The confirmed +2.7 V and +5 V guaranteed-performance points are useful for compact portable systems, while ±15 V support accommodates conventional analog equipment. Designers must confirm output swing into the intended load and noise performance for audio-quality applications. The available verified excerpt does not specify either value, so a production design should not assume the amplifier meets a particular audio-frequency response.
推荐
推荐产品汇总
工程参考数据： OPA234P ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | OPA234UG4 | OPA234U |
|---|---|---|---|
| Package | 8-PDIP | 8-PDIP - consistent according to supplied comparison | 8-PDIP - consistent according to supplied comparison |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Amplifier Configuration | Dual operational amplifier | Dual operational amplifier | Dual operational amplifier |
关键差异点
- Very low dual-channel quiescent current （对比 OPA234UG4)
- Single-supply flexibility （对比 OPA234U)
- Guaranteed low-voltage operation （对比 OPA234UG4)
- Two precision channels in one through-hole package （对比 OPA234U)
设计说明
Calculate the OPA234P supply budget from both channels: the confirmed 250 µA quiescent current per amplifier gives a base of 500 µA with both channels active. Add sensor biasing, resistor-divider current, reference consumption, ADC input leakage, and load current. Because single-supply operation is guaranteed at +2.7 V, +5 V, and ±15 V, verify the selected system's signal range against the input common-mode and output-swing limits rather than relying only on the maximum supply rating.
Place the power-supply bypass capacitor close to the supply pins and provide a low-impedance return path for both amplifier channels. Keep sensitive input traces short and away from switching-node and high-current return paths. For the 8-PDIP through-hole package, preserve the manufacturer's pin spacing and orientation, and verify pin numbering against the complete datasheet before drilling because the supplied web excerpts identify the package and pin count but do not reproduce the pin map.
Do not assume that a single-supply amplifier can process signals near ground without input and output headroom. Confirm the common-mode input range, output swing, and channel behavior near the supply rails at the intended operating voltage. Also avoid using the +36 V maximum as a design target without checking the complete absolute-maximum and electrical tables. The verified excerpts do not provide those numerical limits, making datasheet review essential before final circuit sign-off.
The OPA234 family is characterized for low offset and strong common-mode and power-supply rejection, but actual signal-chain error also depends on source impedance, bias current, noise, gain, and frequency. For high-impedance sensors, calculate the bias-current error across source resistance and include it in the input-referred error budget. For active filters, derive maximum operating frequency from the verified gain-bandwidth product and slew rate before finalizing resistor and capacitor values.
合规信息
The supplied verified excerpts do not provide component-specific environmental or automotive compliance declarations. The industrial temperature-grade designation does not by itself establish AEC-Q100 qualification.
