OPA336U - 2.1V MicroPower CMOS Op Amp | Texas Instruments
MPN： OPA336U ✓ 啟用中OPA336U 概覽
An operational amplifier, or op amp, is a high-gain differential amplifier used to amplify, buffer, filter, or compare small voltage signals. The OPA336 belongs to the microPower CMOS operational-amplifier hierarchy and is optimized for low-voltage, single-supply systems. Its common-mode input range extends to the negative supply, making it suitable for systems whose signals are referenced near ground without requiring a bipolar supply.
The OPA336 family's principal advantages are low power consumption and precision input characteristics. Quiescent current is 20uA per amplifier, maximum input offset voltage is 125uV, input bias current is 1pA, and open-loop gain is 115dB. The output is rail-to-rail and swings to within 3mV of the supply with a 100kOhm load. Single, dual, and quad versions share identical specifications, allowing design flexibility when channel count changes.
OPA336U is the single-amplifier 8-SOIC ordering variant. Its CMOS input architecture supports low-bias-current measurement and avoids the comparatively high input currents associated with conventional bipolar transistor input stages. The 115dB open-loop gain provides useful DC precision, while the rail-to-rail output improves usable dynamic range in compact systems constrained to a single low-voltage supply.
Typical uses include battery-powered sensor interfaces, portable medical instruments, low-current data acquisition, electrochemical sensor conditioning, smart sensors, and low-leakage measurement circuits. Its low 20uA-per-amplifier supply demand is especially valuable when the complete amplifier must operate from a small cell or energy-harvesting supply. High-impedance sources can benefit from the 1pA input bias current specification.
Designers should verify the complete operating range of the selected OPA336 variant, including supply voltage, common-mode range, output swing, load capability, temperature range, and stability requirements. Capacitive loading and noise-gain configuration can affect output behavior, so the manufacturer datasheet and application guidance should be consulted before finalizing a high-gain or heavy-load design.
This page combines verified Texas Instruments product information, distributor availability references, package details, drop-in ordering alternatives, comparison parameters, and practical selection guidance. It is designed to help engineers identify whether OPA336U fits a low-power, single-supply precision-amplifier design and to evaluate compatible alternatives without assuming unverified specifications.
直接替換替代品，適用於 OPA336U — 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。
OPA336UA
✅ 直接替換📋 參考替代品（不在目錄中）
OPA336U/2K5
✅ 直接替換📋 參考替代品（不在目錄中）
OPA336UID
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
OPA336UIDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
OPA336AID
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
OPA336U 最大額定值與電氣特性
| Product Type | Single-supply microPower CMOS operational amplifier |
| Amplifier Count | 1 amplifier |
| Minimum Supply Voltage | 2.1 V |
| 靜態電流 | 20 uA per amplifier |
| Maximum Input Offset Voltage | 125 uV |
| Input Bias Current | 1 pA |
| Open-Loop Gain | 115 dB |
| Output Swing | Within 3 mV of the supplies at 100 kOhm load |
| 輸出類型 | Rail-to-rail |
| Common-Mode Input Range | Extends to the negative supply |
| Input Bias Current Type | CMOS |
| Supply Type | Single supply |
| 封裝 | 8-SOIC |
| 安裝類型 | Surface mount |
| Manufacturer | Texas Instruments |
OPA336U 8-soic 腳位配置指南
OPA336U（8-soic 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： OPA336U.
請參閱 資料表 以查看完整腳位配置。
典型應用
OPA336U 適用於 6 應用s: Battery-Powered Sensor Conditioning, Portable Medical Instrumentation, Low-Current Data Acquisition, Smart Sensor and IoT Interface, Precision Current and Voltage Buffering, Low-Power Industrial Monitoring.
Battery-Powered Sensor Conditioning
OPA336U fits battery-powered sensor interfaces because it operates from 2.1V and consumes 20uA of quiescent current per amplifier. Its 1pA input bias current minimizes loading on high-impedance sensing elements, while the common-mode input range extends to the negative supply for convenient ground-referenced signals. The device is placed between a sensor and an ADC or controller, where its low offset of 125uV maximum and 115dB open-loop gain support accurate amplification. The main design consideration is verifying the exact input and output ranges at the selected supply voltage and load.
推薦
Portable Medical Instrumentation
OPA336U is appropriate for portable medical-instrument signal paths where every microamp of supply current affects battery life. The amplifier's 20uA quiescent current per channel and 1pA input bias current are well suited to low-leakage electrode or biosensor interfaces, while its 125uV maximum offset supports precision DC amplification. It can provide gain or buffering ahead of an ADC in a compact single-supply design. Engineers must confirm medical qualification requirements, the applicable operating-temperature grade, and applicable regulatory standards for the finished instrument.
推薦
Low-Current Data Acquisition
OPA336U can serve as the front-end amplifier in a low-current data-acquisition channel that samples slow-changing sensor signals. Its 115dB open-loop gain and 125uV maximum input offset are useful for preserving small DC signals, while the CMOS input stage's 1pA bias current reduces errors with high-source-impedance sensors. The amplifier operates from a single supply as low as 2.1V and uses only 20uA quiescent current. Select feedback resistors and capacitors against the complete gain-bandwidth, noise, settling-time, and stability characteristics in the manufacturer datasheet.
推薦
Smart Sensor and IoT Interface
OPA336U suits smart-sensor interfaces where the sensing element, signal conditioner, and digital controller share a limited power budget. Its low 20uA supply demand preserves battery capacity, and the rail-to-rail output allows the conditioned signal to use most of a low-voltage supply's available range. The 1pA input bias current is particularly helpful when the source impedance is high. In an IoT node, the amplifier can condition a bridge, resistive, or electrochemical sensor before conversion, but the design should include protection and verify sensor-specific settling requirements.
推薦
Precision Current and Voltage Buffering
OPA336U is useful where a low-current precision amplifier must buffer a voltage or support a current-to-voltage conversion stage. Its 125uV maximum offset voltage and 115dB open-loop gain help preserve small signals, while its CMOS input stage avoids substantial bias-current error in high-impedance feedback networks. Operating from 2.1V makes it convenient for compact energy-harvested or cell-powered instrumentation. The output's quoted within-3mV swing is specified at 100kOhm, so output loading and the available output current must be checked when driving heavier downstream loads.
推薦
Low-Power Industrial Monitoring
OPA336U can condition slow industrial sensor signals in distributed monitoring systems constrained by maintenance and power budgets. Its 20uA quiescent current per amplifier reduces standby consumption, and the common-mode range reaching the negative supply simplifies interface circuits referenced to ground. The 115dB open-loop gain and 125uV maximum offset are useful for slow analog measurements, while the 8-SOIC package supports conventional surface-mount assembly. For factory use, confirm the exact temperature grade, electromagnetic environment, isolation requirements, and output drive before production release.
推薦
推薦產品摘要
工程參考資料，適用於 OPA336U — 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 | OPA336UA | OPA336U/2K5 | OPA336UID | OPA336UIDR | OPA336AID |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Amplifier Count | 1 amplifier | 1 amplifier | 1 amplifier | 1 amplifier | 1 amplifier | 1 amplifier |
| Minimum Supply Voltage | 2.1 V | 2.1 V | 2.1 V | 2.1 V | 2.1 V | 2.1 V |
| Quiescent Current | 20 uA per amplifier | 20 uA per amplifier | 20 uA per amplifier | 20 uA per amplifier | 20 uA per amplifier | 20 uA per amplifier |
| Maximum Input Offset Voltage | 125 uV | 125 uV | 125 uV | 125 uV | 125 uV | 125 uV |
| Input Bias Current | 1 pA | 1 pA | 1 pA | 1 pA | 1 pA | 1 pA |
| Open-Loop Gain | 115 dB | 115 dB | 115 dB | 115 dB | 115 dB | 115 dB |
| Output Swing at 100 kOhm Load | Within 3 mV of the supplies | Within 3 mV of the supplies | Within 3 mV of the supplies | Within 3 mV of the supplies | Within 3 mV of the supplies | Within 3 mV of the supplies |
主要差異化特點
- Very low standing current for precision amplification (對比OPA336UA)
- Low bias current supports high-impedance sensing (對比OPA336UID)
- Rail-to-rail output improves low-voltage signal range (對比OPA336U/2K5)
- Precision DC performance in a compact package (對比OPA336AID)
設計說明
Budget the amplifier's 20uA quiescent current together with its load current, bias-network consumption, ADC reference demand, and sensor current. This total current determines battery life more accurately than the op-amp specification alone. The OPA336 operates from 2.1V, but low voltage does not remove the need to check output swing, common-mode limits, and dynamic range at the actual rail voltage. Use the manufacturer's operating characteristic curves for the selected temperature and supply conditions.
Do not interpret the 3mV output-swing figure as a guarantee for every load. The Texas Instruments specification applies at 100kOhm, and heavier loads can reduce output range and change operating behavior. Also account for the 125uV maximum input offset and 115dB open-loop gain when calculating DC accuracy. For high-impedance sources, the 1pA input bias current is beneficial, but resistor thermal noise and board leakage can still become significant error sources.
Keep the op-amp's feedback components close to its pins and provide a clean, low-impedance ground reference. Route sensitive input traces away from switching nodes, high-current return paths, and digital clock lines. If the source impedance is high, use guarding or a physical ground plane around the input node to reduce leakage and surface contamination effects. Before finalizing the 8-SOIC layout, confirm every pin function and exposed thermal condition from the official package drawing because pin-level data was not supplied in the verified excerpts.
合規資訊
The supplied verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from manufacturer identity.
