OPA627AU - 16MHz Precision DIFET Op Amp, 55V/us | TI
부품 번호: OPA627AU ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $17 | $17.00 |
| 10 | $15.9 | $159.00 |
| 100 | $14.5 | $1,450.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $12.1 | $12,100.00 |
OPA627AU 개요
A precision operational amplifier is a type of high-accuracy voltage amplifier within the broader amplifier IC family of analog semiconductors. Precision op amps combine low input offset voltage, low drift, and low bias current so that signal-chain accuracy is preserved over time and temperature, and they sit upstream of ADCs, filters, and output drivers in instrumentation, audio, and measurement systems.
The OPA627AU differentiates itself with very low input bias current of 5pA maximum, enabled by the DIFET junction-isolated FET input process, fast settling to 0.01% in 550ns, and a low maximum offset voltage of 100uV. Unity-gain stability distinguishes it from its sibling OPA637, which is stable only at gain of 5 or greater.
Architecturally, the DIFET process uses dielectric isolation to shrink junction capacitances, allowing the unusual combination of FET-input precision (picoampere bias current) with high-speed dynamics normally associated with bipolar op amps. The result is a single-amplifier solution that historically replaced discrete FET-input hybrid designs in precision signal paths.
Typical applications include professional and high-end audiophile audio preamplifiers and I/V converters for DACs, precision photodiode transimpedance amplifiers where 5pA bias current minimizes offset error, and test-and-measurement front ends requiring fast 55V/us slewing with microvolt-level accuracy.
For design, note the offset trim pins on the SOIC-8 footprint and ensure supply decoupling close to pins 4 and 7; the -25C minimum operating temperature is narrower than many precision op amps, so verify ambient range compliance.
This page synthesizes distributor pricing, drop-in alternatives, cross-references, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: OPA627AU — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: OPA627AU (동일 폼 팩터 및 풋프린트) — 차이점: Package, Slew Rate, Supply Voltage Range, Amplifier Type, Stability.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OPA627BP
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$21.3 / 개
데이터시트 보기 →OPA627AU/2K5
✅ 드롭인✓ 재고 있음
$10.5 / 개
데이터시트 보기 →OPA637AU
✅ 드롭인✓ 재고 있음
$35.86 / 개
데이터시트 보기 →OPA637BP
✅ 드롭인✓ 재고 있음
$11.8 / 개
데이터시트 보기 →OPA627AU 최대 정격 & 전기적 특성
| Amplifier Type | Precision High-Speed DIFET Operational Amplifier |
| Number of Channels | 1 |
| Slew Rate | 55 V/us |
| Gain Bandwidth Product | 16 MHz |
| Input Offset Voltage (Max) | 100 uV |
| Offset Voltage Drift (Max) | 0.8 uV/C |
| Input Bias Current (Max) | 5 pA |
| Settling Time (0.01%) | 550 ns |
| 출력 유형 | Rail-to-rail: No |
| 동작 온도 범위 | -25C to +85C |
| 패키지 | 8-SOIC (D), 3.90mm Width |
| 실장 유형 | Surface Mount |
| Unity-Gain Stable | Yes |
OPA627AU 핀 구성
| 핀 1 | OFFSET TRIM A — Offset null trim connection (per datasheet) |
| 핀 2 | -IN — Inverting input |
| 핀 3 | +IN — Non-inverting input |
| 핀 4 | V- — Negative supply |
| 핀 5 | NC — Not connected (per datasheet) |
| 핀 6 | OUT — Amplifier output |
| 핀 7 | V+ — Positive supply |
| 핀 8 | OFFSET TRIM B — Offset null trim connection (per datasheet) |
일반적인 애플리케이션
OPA627AU 적합 용도: 6 애플리케이션s: High-End Audio Preamplifier / DAC I/V Conversion, Photodiode Transimpedance Amplification, Precision Data Acquisition Front End, Test and Measurement Instrumentation, Active Filter and Signal Conditioning, Precision Reference and DAC Output Buffering.
High-End Audio Preamplifier / DAC I/V Conversion
The OPA627AU is a favorite in professional and audiophile audio signal paths because its 16MHz gain bandwidth and 55V/us slew rate far exceed audio-band requirements, while its 100uV max offset and FET-input 5pA bias current prevent DC offsets and source loading at volume-control networks or DAC current outputs. Used as the I/V converter after a current-output DAC or as a gain stage between preamp sections, it adds no audible slew limiting. Because it is a single op amp, stereo channels use two devices or a dual-to-mono adapter; the -25C to +85C range is ample for indoor electronics. unlike bipolar-input audio op amps, its picoampere inputs keep click/pop offsets minimal at power-up.
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Photodiode Transimpedance Amplification
The 5pA maximum input bias current of the OPA627AU directly minimizes the dominant error term in precision photodiode receivers: with a 1Mohm feedback resistor, bias-current-induced offset is only about 5uV, and with 100Mohm it stays near 500uV, orders of magnitude better than bipolar-input alternatives. The 16MHz bandwidth supports fast photodiode signals, and the 550ns settling to 0.01% allows multiplexed optical channels to be read quickly. The inverting input (pin 2) connects to the photodiode anode/cathode with the feedback resistor and parallel capacitor setting transimpedance gain and stability; the FET input also keeps photodiode dark-current measurement free of gate-leakage error across the industrial temperature span.
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Precision Data Acquisition Front End
In multiplexed data-acquisition systems, each channel must settle accurately within a few microseconds after the mux switches. The OPA627AU settles to 0.01% in 550ns, giving ample margin ahead of a successive-approximation or sigma-delta ADC, while 0.8uV/C maximum offset drift keeps calibration valid across the -25C to +85C span. The 100uV max offset supports direct digitization of small sensor signals without excessive gain error. Placed as a unity-gain buffer in front of the ADC, its FET inputs present negligible load to high-impedance sensors such as pH probes, piezoelectric accelerometers, and bridge circuits, and the 55V/us slew rate tolerates fast input transients without slewing distortion.
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Test and Measurement Instrumentation
Bench instruments, precision references buffers, and sensor conditioners benefit from the OPA627AU's combination of DC precision and AC speed. Its 16MHz bandwidth lets a measurement front end handle fast edges without extra stages, while 100uV max offset supports millivolt-level measurements with 0.1% class accuracy. In an instrumentation amplifier's second stage, the 55V/us slew rate preserves pulse fidelity, and 5pA input bias avoids corrupting high-impedance probe inputs. Designers should verify the -25C minimum ambient if the instrument must meet full -40C industrial ratings, and use the offset trim pins (1 and 8) to null residual system offset in the final calibration step of the instrument production flow.
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Active Filter and Signal Conditioning
The OPA627AU excels in multiple-feedback and Sallen-Key active filters that need both high Q stability and low DC offset at the output. A 16MHz gain bandwidth keeps the actual pole frequencies close to calculated values even for cutoffs in the hundreds of kilohertz, and 55V/us slewing prevents distortion of large-signal filter inputs. The FET-input 5pA bias current means large-value resistors (up to megaohms) can set low filter cutoff frequencies without meaningful input-error current, enabling RC time constants that avoid bulky capacitors. Designers should keep feedback capacitance small and verify phase margin at the chosen noise gain since this is a high-speed amplifier in a precision role.
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Precision Reference and DAC Output Buffering
Voltage references and DAC outputs need a buffer that neither adds offset noise nor degrades load regulation. The OPA627AU's 100uV max offset is a negligible fraction of a 2.5V or 5V reference, its FET inputs draw 5pA so reference-divider loading is essentially zero, and 0.8uV/C drift keeps buffer contribution to reference tempco negligible. The 16MHz bandwidth and 55V/us slew rate let it track DAC code transitions without slew-limited glitches when driving an ADC reference pin through a short trace. Place a small series resistor and local decoupling at the output to isolate capacitive loads, since high-speed op amps can ring with directly connected ceramic capacitance.
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추천 제품 요약
엔지니어링 참조 데이터: OPA627AU — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OPA627BP | OPA627AU/2K5 | OPA637AU | OPA637BP |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain Bandwidth | 16 MHz | 16 MHz | 16 MHz | 80 MHz | 80 MHz |
| Slew Rate | 55 V/us | 55 V/us | 55 V/us | 135 V/us | 135 V/us |
| Unity-Gain Stable | Yes | Yes | Yes | No (stable at gain >= 5) | No (stable at gain >= 5) |
| Input Bias Current (Max) | 5 pA | 5 pA | 5 pA | 5 pA | 5 pA |
주요 차별점
- Unity-gain stability at full 16MHz bandwidth (vs OPA637AU)
- Extremely low input bias current of 5pA max (vs OPA637AU)
- Precision grade option without redesign (vs OPA627BP)
설계 노트
Place a 0.1uF ceramic decoupling capacitor directly at pin 7 (V+) and pin 4 (V-) to ground return, within 2-3mm of each pin, plus bulk 4.7-10uF local storage. As a 16MHz amplifier, the OPA627AU will oscillate with long inductive supply traces. Keep the feedback path short, and for transimpedance use keep the photodiode trace to pin 2 as short as possible to reduce stray capacitance that erodes phase margin.
Do not substitute the pin-compatible OPA637AU into gain-of-1 or gain-of-2 circuits - it is stable only at closed-loop gains of 5 or greater and will oscillate. Also verify the operating environment stays above -25C; this is narrower than the -40C floor of many precision op amps. When using the offset trim pins (1 and 8), follow the datasheet trim network values rather than generic op amp null circuits.
The FET-input stage means input bias current error is negligible, but input capacitance still matters: in transimpedance designs, an estimated feedback capacitor chosen from Cf = sqrt(Cin/(2*pi*Rf*GBW/2)) style stability criteria keeps 16MHz bandwidth usable. Estimated rule-of-thumb: for Rf = 1Mohm and total input capacitance of 10pF, a feedback capacitor on the order of a few picofarads yields a well-damped 45-60 degree phase margin; verify with the manufacturer datasheet stability curves.
규정 준수 정보
Compliance data not present in the provided web data. Verify RoHS/lead-free status via the TI product page at ti.com/product/OPA627, since some OPA627 builds are legacy non-RoHS.
