OPA4140AIPW - Quad 11MHz JFET Precision Op Amp | Texas Instruments
부품 번호: OPA4140AIPW ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $9.2 | $9.20 |
| 10 | $8.28 | $82.80 |
| 100 | $7.1 | $710.00 |
| 500 | $6.05 | $3,025.00 |
| 1,000 | $5.2 | $5,200.00 |
OPA4140AIPW 개요
A JFET-input operational amplifier is a class of analog amplifier that uses junction field-effect transistors at the input stage to deliver very high input impedance (giga-ohm range) and exceptionally low input bias current. JFET op amps sit within the broader hierarchy of operational amplifiers -> linear amplifiers -> analog ICs -> semiconductor devices. Compared to bipolar-input op amps, JFET inputs avoid the picoamp-to-nanoamp bias currents of BJT inputs and excel in high-impedance sensor interfaces, transimpedance amplifiers, and precision integrators.
Key features include rail-to-rail swing that allows designers to maximize dynamic range on low-voltage single supplies (down to 4.5 V), an input common-mode range that includes the negative supply (V-), and a quiescent current of approximately 1.8 mA per channel. The combination of 5.1 nV/√Hz noise and 1 µV/°C drift positions this part as a premium choice for instrumentation where temperature stability and source-impedance robustness matter.
Typical applications include precision analog front-ends for industrial sensors, audio preamplifiers and DAC output buffers, photodiode transimpedance stages, medical instrumentation signal conditioning, and active filters in test-and-measurement equipment. The 36-V absolute-maximum supply also permits ±18 V dual-rail designs in professional audio and industrial process control.
When designing with the OPA4140AIPW, choose feedback resistors between 2 kΩ and 100 kΩ to minimize Johnson noise contribution and bias-current offset error. Use 0.1 µF ceramic bypass capacitors within 5 mm of each supply pin to suppress oscillation in high-gain configurations.
This page synthesizes verified distributor pricing, drop-in same-package and cross-brand alternatives, and practical design guidance not available from any single distributor listing or datasheet abstract.
드롭인 대체품: OPA4140AIPW — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: OPA4140AIPW (동일 폼 팩터 및 풋프린트) — 차이점: Amplifier Type, Package, Slew Rate, MSL Level, Number of Channels.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OPA4140AIPWR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA4140AIPW-Q1
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2140AIPW
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2277UA
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$2.95 / 개
데이터시트 보기 →OPA4140AIPW 최대 정격 & 전기적 특성
| Number of Channels | 4 (quad) |
| Amplifier Type | JFET-input precision operational amplifier |
| Gain Bandwidth Product | 11 MHz |
| Slew Rate | 20 V/µs |
| Input Offset Voltage (max) | 120 µV |
| Input Offset Drift (max) | 1 µV/°C |
| Input Bias Current (max) | 10 pA |
| Voltage Noise Density | 5.1 nV/√Hz |
| Supply Voltage Range (single) | 4.5 V to 36 V |
| Supply Voltage Range (dual) | ±2.25 V to ±18 V |
| Quiescent Current (per channel, typ) | 1.8 mA |
| Output Swing | Rail-to-rail |
| Common-Mode Input Range | Includes V- (negative rail) |
| 동작 온도 범위 | -40 °C to +125 °C |
| 패키지 | 14-TSSOP (PW), 4.40 mm body width |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 2 (1 year floor life) |
| RoHS 상태 | Compliant |
| Lead-Free | Yes |
OPA4140AIPW 핀 구성
| 핀 1 | OUT_A — Channel A output |
| 핀 2 | IN-_A — Channel A inverting input |
| 핀 3 | IN+_A — Channel A non-inverting input |
| 핀 4 | V+ — Positive supply voltage |
| 핀 5 | IN+_B — Channel B non-inverting input |
| 핀 6 | IN-_B — Channel B inverting input |
| 핀 7 | OUT_B — Channel B output |
| 핀 8 | OUT_C — Channel C output |
| 핀 9 | IN-_C — Channel C inverting input |
| 핀 10 | IN+_C — Channel C non-inverting input |
| 핀 11 | V- — Negative supply voltage |
| 핀 12 | IN+_D — Channel D non-inverting input |
| 핀 13 | IN-_D — Channel D inverting input |
| 핀 14 | OUT_D — Channel D output |
일반적인 애플리케이션
OPA4140AIPW 적합 용도: 7 애플리케이션s: Precision Instrumentation Amplifier Front-End, Audio DAC Output I/V Converter, Photodiode Transimpedance Amplifier, Active Filter and Equalizer Stage, Medical Instrumentation Signal Conditioning, Industrial Process Control Analog Input, Test and Measurement Equipment Front-End.
Precision Instrumentation Amplifier Front-End
The OPA4140AIPW is ideal for precision instrumentation front-ends thanks to its 120 µV maximum input offset voltage, 1 µV/°C maximum offset drift, and 5.1 nV/√Hz voltage noise density. In a three-op-amp instrumentation topology, three of the four channels provide the INA function while the fourth is reserved for gain, filtering, or post-amplification - eliminating the need for a second op amp IC on the board. The JFET input stage delivers 10 pA maximum bias current, which prevents bias-current-induced error in high-impedance strain-gauge and bridge-sensor interfaces where source impedances exceed 10 kΩ. The 11 MHz GBW preserves closed-loop gain accuracy above 100 kHz, suitable for vibration and acoustic-sensor signal chains where bandwidth extends into the ultrasonic region. Quiescent current of 1.8 mA per channel keeps total consumption around 7 mA, acceptable for portable instrumentation. The 4.5 V to 36 V supply range covers both ±15 V industrial analog rails and 5 V single-supply sensor designs.
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Audio DAC Output I/V Converter
The OPA4140AIPW excels in audio DAC current-to-voltage (I/V) converter service because its 5.1 nV/√Hz spectral noise floor preserves dynamic range above 110 dB when paired with modern 24-bit DACs. With the OPAx140 family featuring rail-to-rail output, the I/V stage can swing within 200 mV of either supply rail, maximizing headroom on ±15 V audio rails or ±5 V portable supplies. Two of the four channels can implement balanced differential I/V for a stereo DAC, while the remaining two channels handle DC servo or headphone buffer functions - reducing board area and BOM cost. The 20 V/µs slew rate ensures clean transient response on music peaks, while low 1/f noise corner avoids low-frequency hum artifacts. JFET inputs eliminate the bias-current-induced offset that would otherwise drift the I/V converter's DC operating point over temperature. According to the OPAx140 datasheet, total harmonic distortion plus noise (THDN) remains below 0.0007 % in audio band.
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Photodiode Transimpedance Amplifier
Photodiode transimpedance amplifiers (TIAs) require low input bias current, low voltage noise, and adequate bandwidth - all three delivered by the OPA4140AIPW. The 10 pA maximum input bias current minimizes dark-current integration error in precision optical measurements where photodiode currents are in the nanoampere range. The 5.1 nV/√Hz voltage noise combined with 11 MHz GBW supports feedback resistors from 100 kΩ to 10 MΩ with stable closed-loop bandwidth exceeding 100 kHz. Using one channel as the TIA, the second as a bias-voltage buffer, and the third as a gain stage, the quad channel count reduces PCB footprint. The JFET input stage also exhibits lower current noise than BJT alternatives, which becomes critical when TIA feedback resistors exceed 1 MΩ. The 36 V absolute-maximum supply allows high-voltage photodiode biasing for avalanche photodiodes in LiDAR receivers.
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Active Filter and Equalizer Stage
The OPA4140AIPW's 11 MHz gain-bandwidth product and 20 V/µs slew rate make it ideal for active low-pass, high-pass, and band-pass filter stages operating in the audio band up to 200 kHz. A Sallen-Key topology using two of the four channels delivers 2nd-order Butterworth response with unity-gain stability, while the third and fourth channels implement additional stages for higher-order filters. The 120 µV offset minimizes DC error at the filter output, important when filtering DC-coupled signals from sensors. Low voltage noise preserves signal-to-noise ratio through cascaded filter stages, where each op amp's self-noise would otherwise accumulate. The 4.5 V to 36 V supply range accommodates both 5 V and ±15 V analog filter designs in industrial process control. According to the OPAx140 datasheet, the unity-gain stable output stage is unconditionally stable with capacitive loads up to 1 nF.
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Medical Instrumentation Signal Conditioning
The OPA4140AIPW is well-suited to medical instrumentation signal chains including ECG front-ends, EEG amplifiers, and patient-monitoring sensor interfaces. The 10 pA maximum input bias current prevents the input bias from saturating high-impedance biopotential electrodes that connect the patient to the amplifier. Combined with 120 µV maximum input offset and 1 µV/°C drift, the part supports ECG amplifiers operating at high gain where DC drift would otherwise obscure low-frequency cardiac signals. The 5.1 nV/√Hz noise preserves signal integrity for low-amplitude EEG channels, while the 11 MHz bandwidth handles high-frequency components of evoked-potential waveforms. The 36 V supply tolerance also protects against defibrillator-induced overvoltages when current-limiting resistors and clamping diodes are added externally. Per TI datasheet, the JFET input provides inherent ESD robustness.
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Industrial Process Control Analog Input
The OPA4140AIPW serves reliably in industrial 4-20 mA loop receivers, RTD and thermocouple amplifiers, and PLC analog input modules where wide supply tolerance and high noise immunity are mandatory. The 4.5 V to 36 V single-supply range accommodates 24 V industrial bus power, while ±18 V dual-supply operation supports legacy process-control instrumentation. With four channels per package, a single OPA4140AIPW handles four analog input channels, reducing PCB area by up to 75 % compared with single-channel op amp solutions. The 5.1 nV/√Hz noise floor preserves 16-bit ADC resolution in 0-10 V input modules, and 11 MHz GBW supports multiplexed input stages settling within 1 µs. Operating temperature range of -40 °C to +125 °C covers both outdoor and cabinet-mounted installations. The OPAx140 datasheet confirms 5 kV HBM ESD tolerance on the input pins, robust for industrial EMI environments.
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Test and Measurement Equipment Front-End
The OPA4140AIPW delivers the precision and bandwidth required for oscilloscope front-ends, data-acquisition system input buffers, and bench multimeter analog signal conditioning. Its 11 MHz GBW preserves 100 kHz sine-wave fidelity at unity gain, while 5.1 nV/√Hz voltage noise floor extends dynamic range beyond 100 dB when used in oscilloscope vertical preamplifiers. The JFET input stage with 10 pA bias current supports direct coupling to high-impedance probes without external bias-current compensation circuits. Quad channel count lets a single OPA4140AIPW service four oscilloscope input channels, halving the analog-front-end IC count. The 36 V supply range allows direct sensing of ±15 V signals without input dividers, simplifying the signal path. Per TI datasheet, low input capacitance minimizes probe-loading artifacts in high-impedance measurements.
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추천 제품 요약
엔지니어링 참조 데이터: OPA4140AIPW — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OPA4140AIPWR | OPA4140AIPW-Q1 | OPA2140AIPW |
|---|---|---|---|---|
| Package | 14-TSSOP (PW) | 14-TSSOP (PW) - same | 14-TSSOP (PW) - same | 14-TSSOP (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Channels | 4 | 4 | 4 | 2 |
| Gain Bandwidth Product | 11 MHz | 11 MHz | 11 MHz | 11 MHz |
| Input Offset Voltage (max) | 120 µV | 120 µV | 120 µV | 120 µV |
| Voltage Noise Density | 5.1 nV/√Hz | 5.1 nV/√Hz | 5.1 nV/√Hz | 5.1 nV/√Hz |
| Automotive Grade (AEC-Q100) | No | No | Yes | No |
| Packaging Format | Tube | Tape & Reel | Tube or Reel | Tube |
주요 차별점
- Quad-channel density in TSSOP-14 (vs OPA2140 dual-channel version)
- Automotive grade option available in same footprint (vs OPA4140AIPWR (commercial grade))
- JFET input stage eliminates bias-current-induced error (vs Bipolar-input op amps)
설계 노트
The OPA4140AIPW draws approximately 1.8 mA quiescent current per channel, totaling 7.2 mA for all four channels at ±15 V. Place a 0.1 µF X7R ceramic bypass capacitor within 5 mm of each supply pin, plus a 10 µF bulk tantalum or ceramic capacitor at the board supply entry point. The 36 V absolute maximum supply rating means that inductive load transients on ±18 V rails can exceed ratings - add a TVS diode such as SMAJ33CA across the supply pins if driving motors or relays.
The 14-TSSOP package has a theta_JA of approximately 110 °C/W. At maximum quiescent current (1.8 mA × 4 = 7.2 mA) on ±18 V supplies, total power dissipation is 0.26 W, yielding a junction temperature rise of about 29 °C above ambient - well within the 150 °C maximum. The plastic TSSOP body, however, is not designed for heatsink attachment, so for sustained high-output-current conditions (>10 mA per channel) into low-impedance loads, plan copper pour area on the PCB to spread heat.
Place input traces short and direct to minimize leakage and stray capacitance. For high-impedance (>100 kΩ source impedance) applications, guard the input traces with a driven ground ring to prevent leakage-induced offset errors. Keep output traces away from input traces to avoid coupling. Use a continuous ground plane on layer 2 directly beneath the op amp to provide a low-impedance return path. Mount bypass capacitors on the same layer as the IC with vias to the ground plane placed close to the capacitor ground pads.
Do not exceed the 36 V absolute maximum supply voltage, including power-on and load-dump transients. Do not drive the input beyond the supply rails by more than 0.5 V - the OPAx140 family includes input ESD diodes that will conduct and cause error or damage. Do not assume the JFET input tolerates input currents; while bias current is only 10 pA, ESD events can inject microamp-level currents. Always include an input current-limiting resistor (10 kΩ typical) on each input when connecting to external connectors.
The 5.1 nV/√Hz voltage noise density combined with the 11 MHz bandwidth means that feedback resistor values above 100 kΩ become the dominant noise contributor. Choose feedback resistors between 2 kΩ and 47 kΩ for best noise performance in low-gain stages. For transimpedance amplifiers, the feedback resistor noise is the limiting factor and cannot be reduced - consider using multiple parallel resistors to reduce Johnson noise. The unity-gain bandwidth of 11 MHz means that capacitive loads above 1 nF may cause peaking - add a small series resistor (10-50 Ω) at the output to isolate capacitive loads.
규정 준수 정보
RoHS and REACH compliant per TI product information. Standard OPA4140AIPW is not AEC-Q100 qualified; choose OPA4140AIPW-Q1 for automotive-qualified versions. Lead-free and halogen-free per TI datasheet.
