OPA171AIDRLT - 36V 3MHz Single Op Amp | Texas Instruments
料号： OPA171AIDRLT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.95 | $0.95 |
| 10 | $0.86 | $8.60 |
| 100 | $0.72 | $72.00 |
| 500 | $0.61 | $305.00 |
| 1,000 | $0.54 | $540.00 |
| 2,500 | $0.48 | $1,200.00 |
OPA171AIDRLT 概述
An operational amplifier (op amp) is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output, used as a foundational building block in analog signal chains. Op amps sit inside the broader hierarchy of linear integrated circuits (ICs) -> amplifiers -> operational amplifiers, and are commonly classified by supply range, bandwidth, power, and noise. The OPA171 is targeted at low-power, single-supply general-purpose applications where a wide supply range (up to 36V) and rail-to-rail output swing are required - it is NOT a precision or low-noise audio op amp, but rather a general-purpose workhorse for industrial and consumer designs.
Key features of the OPA171AIDRLT include 3 MHz GBW, 1.5 V/µs slew rate, 475 µA quiescent current, 36 V supply tolerance, rail-to-rail output swing, ±2 mV typical input offset voltage, and internal RF/EMI filtering on the inputs. The SOT-553 (DRL) package is a low-profile (~0.5 mm) surface-mount micropackage suitable for space-constrained PCB designs. The OPAx171 family delivers low offset, low drift, low quiescent current, and 3 MHz bandwidth simultaneously - a combination rare in this supply-voltage class.
Architecturally, the OPA171 uses a CMOS input stage that allows true rail-to-rail input common-mode range (no input phase reversal), paired with a class AB output stage capable of rail-to-rail swing. Internal EMI/RFI rejection filters on the input pins suppress high-frequency interference, simplifying compliance in industrial environments. The device is also specified over the -40°C to +125°C automotive and industrial temperature range.
Typical applications include building automation sensor conditioning, battery-powered industrial transmitters, low-side current sensing, active filters, transducer drivers, and general-purpose signal buffering in 4-20 mA loops, PLC analog input modules, and portable instrumentation. The wide supply range (2.7V-36V) makes it well-suited to 5V USB-powered systems and 24V industrial bus rails from the same part.
When designing with this op amp, observe that the input common-mode range extends to both rails but the input offset voltage degrades near the rails (CMOS input stage). Output is rail-to-rail but the output swing spec is typically within 50 mV of either rail at light loads. Decouple the supply pin with at least 0.1 µF X7R ceramic placed within 5 mm of the pin to ensure stability and PSRR performance.
This page synthesizes DigiKey/Mouser distributor pricing, drop-in SOT-553 alternatives, and PCB design notes not aggregated on the manufacturer's product page.
直接替换替代料： OPA171AIDRLT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
OPA171AIDRLR
✅ 直接替换📋 参考替代料（不在目录中）
OPA171AIDBVT
✅ 直接替换📋 参考替代料（不在目录中）
OPA171AIDRLT 最大额定值与电气特性
| Manufacturer | Texas Instruments |
| Series | OPAx171 |
| Number of Channels | 1 (Single) |
| Amplifier Type | General Purpose Operational Amplifier |
| 输出类型 | Rail-to-Rail (RRO) |
| Input Type | CMOS (Rail-to-Rail Common-Mode) |
| Gain Bandwidth Product (GBW) | 3 MHz |
| Slew Rate | 1.5 V/µs |
| Supply Voltage Range (Single Supply) | 2.7 V to 36 V |
| Supply Voltage Range (Dual Supply) | ±1.35 V to ±18 V |
| Quiescent Current (per channel) | 475 µA (typical) |
| Input Offset Voltage (VOS) | ±2 mV (typical, ±3.5 mV max at 25°C) |
| Input Bias Current | 8 pA (typical) |
| 工作温度范围 | -40°C to +125°C |
| 封装 | SOT-553 (DRL), 5-pin |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (Unlimited) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| EMI/RFI Input Filter | Internal (Yes) |
| Datasheet Document | Refer to the manufacturer datasheet (ti.com/lit/ds/symlink/opa171.pdf) |
OPA171AIDRLT 引脚配置
| 引脚 1 | OUT — Op-amp output (rail-to-rail) |
| 引脚 2 | V-/GND — Negative supply or ground for single supply |
| 引脚 3 | IN+ — Non-inverting input |
| 引脚 4 | IN- — Inverting input |
| 引脚 5 | V+ — Positive supply (2.7V to 36V) |
典型应用
OPA171AIDRLT 适用于 7 应用s: Industrial 4-20 mA Sensor Conditioning, Battery-Powered Portable Instrumentation, Building Automation and HVAC Sensor Interface, Active Filter and Signal Processing Stage, Automotive Sensor Signal Buffers, Power Supply Voltage and Current Monitor, General-Purpose Signal Amplification and Buffering.
Industrial 4-20 mA Sensor Conditioning
The OPA171AIDRLT is well-matched for industrial 4-20 mA loop-powered sensor conditioning because of its 36V single-supply tolerance and 475 µA quiescent current. In a typical loop interface the op amp buffers and amplifies the millivolt-level signal from a load cell, RTD, or pressure transducer before it drives the loop transmitter. The rail-to-rail output lets the transmitter output span nearly the full 24V loop compliance, while the low Iq keeps the total circuit budget under a few milliamps. A practical circuit uses the OPA171AIDRLT in a 3-op-amp instrumentation configuration with gain set by external resistors to scale the 0-10 mV transducer signal to a 4-20 mA current loop. The internal EMI/RFI filter on the OPA171 inputs suppresses the high-frequency noise that is common on long factory floor cable runs, which is a major reliability benefit over older op amps lacking this filtering. Per the manufacturer datasheet, the EMI rejection ratio exceeds 60 dB at 1 GHz frequencies, allowing the design to pass industrial CE/EMC tests with simpler external filtering.
推荐
Battery-Powered Portable Instrumentation
The 475 µA quiescent current and 2.7V minimum supply make the OPA171AIDRLT ideal for battery-powered portable instrumentation such as handheld multimeters, data loggers, and medical monitoring wearables. Powered from a single Li-ion cell (3.0V to 4.2V) or two AA cells, the part draws very little overhead current while providing 3 MHz of bandwidth - enough for active filters and piezoelectric transducer amplifiers. The CMOS input stage presents only 8 pA of bias current, which is critical for high-impedance sensor interfaces such as pH probes or piezo film sensors where bias current would otherwise create drift. A common configuration uses the OPA171AIDRLT as a unity-gain buffer for a high-impedance sensor, followed by a gain stage to drive the ADC. Total supply current for the two-stage signal chain is under 1 mA, extending battery runtime by 20-30 percent compared to older quad op amps. The 36V supply tolerance is a safety margin that protects the op amp from inductive kickback or battery transient over-voltage.
推荐
Building Automation and HVAC Sensor Interface
The OPA171AIDRLT suits building automation sensor interfaces - including thermistor bridges, humidity sensors, and CO2 sensor interfaces - where the supply rail is typically 24V AC or 24V DC and the op amp must tolerate common-mode transients well above 5V. The 36V supply voltage range covers the rectified 24VAC rail with margin, and the rail-to-rail output swing lets the microcontroller's ADC see the full dynamic range without leaving gain unused. In a typical circuit, the OPA171AIDRLT serves as a 1.5x gain buffer between a 10 kΩ NTC thermistor divider and a 0-3.3V ADC, producing a temperature-to-voltage response that the MCU interprets directly. The wide operating temperature range (-40°C to +125°C) of the OPA171AIDRLT matches the harsh indoor and outdoor environments common to HVAC and building automation. The SOT-553 package sits cleanly behind a 0805 passive network, allowing the entire analog signal chain to fit inside a 5 mm x 5 mm footprint - useful for thin distributed sensor nodes mounted on HVAC ducts.
推荐
Active Filter and Signal Processing Stage
The OPA171AIDRLT delivers 3 MHz of gain-bandwidth product which is well-suited for active low-pass, high-pass, and band-pass filters up to a few hundred kHz. Designers choose the OPA171AIDRLT for general-purpose Sallen-Key filters in audio band (20 Hz-20 kHz), anti-aliasing filters for ADCs, and reconstruction filters after DACs. The 1.5 V/µs slew rate handles full-scale output transitions below 4 µs, which is adequate for most multi-tone signal chains but not for ultra-low-distortion audio applications. A typical Sallen-Key filter with the OPA171AIDRLT uses 1% resistor and capacitor matching to achieve Butterworth response; the rail-to-rail output stage allows the filter to deliver signals within 50 mV of either supply, maximizing SNR. The 36V supply is useful for industrial active filters whose input may swing over 10V - a use case that 5V-only general-purpose op amps cannot handle.
推荐
Automotive Sensor Signal Buffers
The OPA171AIDRLT can serve as a sensor signal buffer in 12V automotive systems (with the qualification note that it is NOT AEC-Q100 qualified - see the OPA171-Q1 family for qualified versions). For non-safety automotive applications such as body control modules, climate-control HVAC sensors, and infotainment analog inputs, the wide supply tolerance (up to 36V) gives margin against load-dump transients up to 40V. The CMOS input with 8 pA bias current is appropriate for high-impedance Hall-effect and resistive sensor bridges. In a typical use the OPA171AIDRLT buffers the analog output of a rotary position sensor before the MCU's ADC. The internal EMI filter helps the design pass automotive CISPR 25 radiated emissions tests by suppressing the high-frequency interference that couples into sensor wiring harnesses from adjacent motor and RF sources. Designers needing AEC-Q100 qualification should choose the OPA171-Q1 family instead.
推荐
Power Supply Voltage and Current Monitor
The OPA171AIDRLT fits power-supply voltage and current monitoring circuits that supervise 12V, 24V, or 36V rails. A common configuration uses the part as a unity-gain buffer between a high-side current-sense amplifier output and the supervisor ADC, or as a low-side current-to-voltage gain stage with a 0.1 ohm shunt. The 36V supply tolerance tolerates direct connection to the system rail without the need for a separate analog supply rail, simplifying the BOM for compact systems. Designers also use the OPA171AIDRLT as a comparator-like threshold detector in supervisor circuits - though TI recommends pairing the OPA171 with a dedicated reference such as the TL431 for accurate threshold voltages. The part's 3 MHz bandwidth captures fast transient events during power-supply step changes, and the EMI input filter rejects the switching noise from adjacent DC-DC converters. Estimated total supply current of 2 op amps (one buffer, one gain stage) is around 1 mA - acceptable in always-on monitoring applications.
推荐
General-Purpose Signal Amplification and Buffering
In any general-purpose signal conditioning board the OPA171AIDRLT functions as a unity-gain buffer to isolate high-impedance sources, as a non-inverting or inverting amplifier for voltage scaling, or as a comparator with a logic reference. Its 3 MHz GBW makes it a sensible default op amp where production volume favors a single low-cost part across multiple boards; one stock-keeping part can serve one-off analog front-ends, test fixtures, and educational designs. The SOT-553 footprint is small enough that two OPA171AIDRLT chips occupy less board area than a single SOIC-8 dual op amp. The wide 2.7V to 36V supply means a single design can move between 3.3V MCU, 5V USB-powered, 12V automotive, and 24V industrial with no part substitution - a major logistical advantage for low-to-medium-volume diversified products. Per the datasheet, the input offset drifts approximately 1.5 µV/°C and is dominated by the CMOS input stage; circuits needing tighter drift should use the OPA2188 instead.
推荐
推荐产品汇总
工程参考数据： OPA171AIDRLT ——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 | OPA171AIDRLR | OPA171AIDBVT | OPA170AIDBVT |
|---|---|---|---|---|
| Package | SOT-553 (DRL), 5-pin | SOT-553 (DRL), 5-pin - same | SOT-23-5 (DBV), 5-pin - different footprint | SOT-23-5 (DBV), 5-pin - different footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channel Count | 1 (Single) | 1 (Single) | 1 (Single) | 1 (Single) |
| Supply Voltage Range | 2.7V to 36V | 2.7V to 36V | 2.7V to 36V | 2.7V to 36V |
| Gain-Bandwidth Product | 3 MHz | 3 MHz | 3 MHz | 1.2 MHz |
| Slew Rate | 1.5 V/µs | 1.5 V/µs | 1.5 V/µs | 0.5 V/µs |
| Quiescent Current | 475 µA | 475 µA | 475 µA | 110 µA |
| Output Type | Rail-to-Rail (RRO) | Rail-to-Rail (RRO) | Rail-to-Rail (RRO) | Rail-to-Rail (RRO) |
| Automotive Grade (AEC-Q100) | No (use OPA171-Q1 family) | No | No | No |
| RoHS / Lead-Free | Compliant / Yes | Compliant / Yes | Compliant / Yes | Compliant / Yes |
关键差异点
- Reel-encoding flexibility without electrical change （对比 OPA171AIDRLR)
- Higher GBW (3 MHz) versus OPA170 family (1.2 MHz) （对比 OPA170AIDBVT)
- Wider supply range up to 36V （对比 MCP6071T-E/LT (6V only))
设计说明
Estimated: at 25°C ambient with a typical 36V supply and 1 kΩ load, the OPA171AIDRLT dissipates around 17 mW when the output is at mid-supply. To maintain low-distortion operation, place a 0.1 µF X7R ceramic decoupling capacitor as close as possible to pin 5 (V+) and pin 2 (V-/GND) - within 5 mm of each pin - and pair it with a bulk 1-10 µF tantalum or polymer cap to handle transient current demands of the output stage. Low-impedance supply traces are critical because the 36V supply can deliver up to 100 mA into a low-impedance load during transients, so use 0.5 mm or wider power traces.
The SOT-553 (DRL) package has a small 1.7 mm x 1.2 mm footprint which requires careful PCB layout to avoid solder-bridging between pins during reflow. Use a land pattern that matches TI's recommended PCB footprint in the datasheet, with solder mask-defined pads for cleaner reflow results. Keep input trace lengths short to minimize EMI pickup, and route the inverting input trace (pin 4) away from the output (pin 1) to prevent parasitic feedback. The exposed thermal pad, where present, should be soldered to the board for mechanical stability.
Do not load the output below 2 kΩ at 36V - the output swing specification derates at lower load impedances and the part can exhibit distortion. Do not operate the inputs above or below the supply rail without current limiting - the CMOS input stage has input ESD diodes that conduct when VIN exceeds VCC by more than 0.3V. When using the OPA171AIDRLT as a comparator, note that the response time is limited by the 1.5 V/µs slew rate, so do not expect nanosecond comparator-speed behavior. For comparator applications use the TL331 or TLV3201 instead.
Place the 0.1 µF supply bypass capacitor within 5 mm of pin 5 and pin 2 of the SOT-553 footprint, using a wide ground trace back to the analog ground plane. For unity-gain buffer applications, a small (10-100 pF) feedback capacitor between OUT and IN- can improve phase margin when driving long cables or capacitive loads. For differential input traces, use a guard ring around the high-impedance input traces to prevent leakage currents on the PCB from contaminating the analog signal. The exposed thermal pad, if present in the layout, should be tied to analog ground for minimum noise pickup.
合规信息
RoHS compliant and lead-free per the TI product page and DigiKey listing (sku 2523382). NOT AEC-Q100 qualified - choose the OPA171-Q1 family for automotive applications. Reach compliance confirmed via manufacturer declaration. Halogen-free per TI policy. Refer to the manufacturer datasheet for full compliance documentation.
