OPA735AIDR - Zero-Drift 1.6MHz CMOS Op Amp, 5uV | TI
부품 번호: OPA735AIDR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.18 | $21.80 |
| 100 | $1.92 | $192.00 |
| 500 | $1.68 | $840.00 |
| 1,000 | $1.45 | $1,450.00 |
| 2,500 | $1.28 | $3,200.00 |
OPA735AIDR 개요
A zero-drift operational amplifier is a precision analog amplifier that uses internal calibration (chopping or auto-zeroing) to continuously correct its input offset voltage, eliminating the 1/f noise and temperature drift that limit conventional CMOS op amps. Within the signal-chain hierarchy, zero-drift op amps belong to the precision-amplifier (or instrumentation-amplifier) category, which sits under the broader amplifier IC family and ultimately under analog signal conditioning. The OPA735's 5 uV max VOS and 0.05 uV/degC drift place it in the sub-10 uV precision tier favored for transducer front-ends.
Key differentiating specifications include 5 uV maximum input offset voltage, 0.05 uV/degC maximum offset drift, 1.6 MHz GBW, 115 dB CMRR, 1.6 mA typical quiescent current, and 50 mV rail-to-rail output headroom. The device supports both single and bipolar supplies (e.g., +5 V, +/-2.5 V, +/-5 V) and provides high-impedance CMOS inputs that draw only a few picoamperes of bias current - critical for high-impedance sensor bridges.
Architecturally, the OPA735 uses a switched-capacitor auto-zero topology that periodically samples and cancels the input offset and 1/f noise, achieving drift performance comparable to much larger chopper-stabilized modules while drawing only milliamps of quiescent current. This makes it ideal for battery-powered precision instrumentation where both accuracy and power budget matter.
Typical applications include precision weigh scales, strain-gauge bridges, thermocouple conditioning, medical instrumentation front-ends, handheld multimeter ADC drivers, and precision current-sense amplifiers. Designers also deploy the OPA735 in active filters, integrators, and reference buffers for 16- to 24-bit ADCs.
When laying out the PCB, place the 0.1 uF power-supply bypass capacitor within 2 mm of the supply pin and keep input traces short and guarded to preserve the 115 dB CMRR at high frequencies. The SOIC-8 thermal performance is adequate for the device's low dissipation; no heatsink is required.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives (including the OPA734 companion and cross-brand equivalents), and practical layout notes not found in the standalone datasheet.
드롭인 대체품: OPA735AIDR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: OPA735AIDR (동일 폼 팩터 및 풋프린트) — 차이점: Package, Number of Channels, Amplifier Type, Gain-Bandwidth Product, Input Offset Voltage (max).
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OPA735AID
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA735AIDRG4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA734AIDR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2277UA
✅ 드롭인✓ 재고 있음
$2.95 / 개
데이터시트 보기 →MCP6072T-E/SN
✅ 드롭인✓ 재고 있음
$0.72 / 개
데이터시트 보기 →MAX9100EUK+T
✅ 드롭인✓ 재고 있음
$1.95 / 개
데이터시트 보기 →OPA735AIDR 최대 정격 & 전기적 특성
| Number of Channels | 1 |
| Amplifier Type | Zero-Drift / Auto-Zero CMOS Operational Amplifier |
| Input Offset Voltage (max) | 5 uV |
| Offset Drift (max) | 0.05 uV/degC |
| Gain-Bandwidth Product | 1.6 MHz |
| CMRR | 115 dB |
| Quiescent Current (typ) | 1.6 mA |
| Supply Voltage Range (single) | 2.7 V to 12 V |
| Supply Voltage Range (bipolar) | +/-1.35 V to +/-6 V |
| Output Swing | Rail-to-Rail (within 50 mV of rails) |
| 동작 온도 | -40 C to +85 C |
| 패키지 | SOIC-8 (D) 3.90 mm |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 2 (1 year) |
| RoHS 상태 | Compliant |
| Input Type | CMOS, high-impedance |
OPA735AIDR 핀 구성
| 핀 1 | NC — Not connected (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 — Output |
| 핀 7 | V+ — Positive supply |
| 핀 8 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
OPA735AIDR 적합 용도: 7 애플리케이션s: Precision Weigh Scale Signal Conditioning, Thermocouple Cold-Junction Compensation, Handheld Multimeter ADC Driver, Medical Instrumentation Front-End, Precision Current-Sense Amplifier, Active Filter and Integrator Stage, Photodiode Transimpedance Amplifier.
Precision Weigh Scale Signal Conditioning
The OPA735AIDR is ideal for strain-gauge bridge amplification in weigh-scale front-ends. Its 5 uV max input offset and 0.05 uV/degC drift directly minimize scale zero-point error and creep over temperature, while the 115 dB CMRR rejects common-mode noise from the bridge excitation. The high-impedance CMOS inputs accept low-output-impedance bridges without loading distortion. A typical circuit places the OPA735 as the first-stage instrumentation amp (INA129) gain-of-100 block, feeding a 24-bit ADC. Compared to chopper op amps in this role, the OPA735's 1.6 MHz GBW handles fast settling for multi-conversion-per-second update rates common in shipping scales.
추천
Thermocouple Cold-Junction Compensation
The OPA735AIDR serves as a precision buffer for thermocouple cold-junction compensation in industrial temperature monitoring. The 5 uV offset translates to <0.1 C equivalent error for Type K thermocouples, and the 0.05 uV/degC drift stays below the measurement resolution of typical 16-bit ADCs across the industrial -40 C to +85 C ambient range. The rail-to-rail output swing supports single 5 V supply designs, eliminating the negative rail typically required for thermocouple conditioning. Combined with a precision reference (REF3030) and an op-amp thermocouple amplifier (OPA2188), the OPA735 enables total error budgets under 0.5 C.
추천
Handheld Multimeter ADC Driver
The OPA735AIDR drives the input of 16- to 20-bit ADCs in handheld digital multimeters. Its 1.6 MHz GBW settles quickly enough for the 4 kHz conversion rate typical of RMS multimeters, while the 5 uV max offset contributes less than 1 count at 20-bit resolution on a 5 V reference. The single-supply 2.7 V to 12 V operation supports both 3.3 V logic-level ADCs and 5 V bipolar-input ADCs without level translation. Compared to OPA2277 in this role, the OPA735's auto-zero drift cancellation eliminates the periodic recalibration that conventional precision op amps require for 0.01% accuracy DMMs.
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Medical Instrumentation Front-End
The OPA735AIDR is well-suited to the front-end of medical instrumentation including ECG, EEG, and pulse-oximeter signal chains. The 5 uV offset and 0.05 uV/degC drift maintain baseline stability over long patient-monitoring sessions, while the high input impedance (CMOS, pA-level bias) prevents loading of skin-electrode biopotential sources. The rail-to-rail output swing on a single 5 V supply enables direct connection to 24-bit medical-grade ADCs. The device's low 1.6 mA quiescent current is critical for battery-powered ambulatory monitors. FDA-cleared designs reference the OPA735 family in the documented schematics.
추천
Precision Current-Sense Amplifier
The OPA735AIDR implements high-side or low-side current-sense amplifiers in battery-management and power-monitoring applications. Its 5 uV offset translates to sub-mA current-measurement accuracy when used with a 10 mOhm shunt, and the rail-to-rail output swing supports both low-voltage (3.3 V) and high-voltage (12 V) supply rails. The 1.6 MHz GBW handles the dynamic response of switching-mode power supplies, while the 115 dB CMRR rejects switching noise injected onto the common-mode voltage. Combined with a precision reference (REF3012) and 16-bit ADC (ADS1115), the OPA735 enables coulomb-counting accuracy within 1% across the discharge curve.
추천
Active Filter and Integrator Stage
The OPA735AIDR functions as a precision active filter or integrator in 50 Hz/60 Hz line-noise rejection stages, sensor-signal conditioners, and analog computing modules. The 1.6 MHz GBW supports second-order low-pass filters with cutoffs up to 50 kHz, while the 5 uV offset and 0.05 uV/degC drift preserve DC accuracy in integrator reset circuits. The SOIC-8 single-channel package allows dense PCB layouts for multi-pole filters. Compared to TL082-class op amps, the OPA735's drift performance reduces long-time-constant integrator error to negligible levels in 10-second time-base integrators.
추천
Photodiode Transimpedance Amplifier
The OPA735AIDR operates as a transimpedance amplifier (TIA) for photodiode current measurement in optical sensors, smoke detectors, and ambient-light systems. The high-impedance CMOS inputs handle pA-level photodiode currents directly without introducing bias-current error, while the 5 uV offset and low drift enable accurate measurements down to nA-scale photocurrents. The 1.6 MHz GBW supports gain-bandwidth products adequate for 100 kHz pulse response in optical-communication receivers. Combined with a low-leakage photodiode (BPW34) and 16-bit ADC, the OPA735 enables precision light-measurement systems.
추천
추천 제품 요약
엔지니어링 참조 데이터: OPA735AIDR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OPA735AID | OPA735AIDRG4 | OPA734AIDR | OPA2277UA | MCP6072T-E/SN |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology |
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (SN) - same footprint |
| Gain-Bandwidth Product | 1.6 MHz | 1.6 MHz | 1.6 MHz | 0.7 MHz (-56%) | 1 MHz (-38%) | 1.2 MHz (-25%) |
| Input Offset Voltage (max) | 5 uV | 5 uV | 5 uV | 5 uV | 10 uV (+100%) | 150 uV (+2900%) |
| Offset Drift (max) | 0.05 uV/degC | 0.05 uV/degC | 0.05 uV/degC | 0.05 uV/degC | 0.1 uV/degC (+100%) | 1.5 uV/degC (+2900%) |
| Quiescent Current (typ) | 1.6 mA | 1.6 mA | 1.6 mA | 0.6 mA (-62%) | 1.4 mA (-12%) | 1.1 mA (-31%) |
| CMRR | 115 dB | 115 dB | 115 dB | 115 dB | 130 dB (+15 dB) | 90 dB (-25 dB) |
| Supply Voltage Range | 2.7 V to 12 V | 2.7 V to 12 V | 2.7 V to 12 V | 2.7 V to 12 V | +/-2 V to +/-18 V | 1.8 V to 5.5 V |
| Rail-to-Rail Output | Yes (within 50 mV) | Yes | Yes | Yes | No (swing to +/-13 V) | Yes (RRIO) |
주요 차별점
- Sub-10 uV zero-drift precision in SOIC-8 (vs OPA2277UA)
- Higher GBW for wider signal bandwidth (vs OPA734AIDR)
- Best-in-class CMRR for sensor bridge applications (vs MCP6072T-E/SN)
설계 노트
Place a 0.1 uF ceramic bypass capacitor within 2 mm of the V+ pin and a 1 uF to 10 uF bulk capacitor at the supply entry point. The SOIC-8 package pin layout places V- at pin 4 - do not route the negative-rail input trace under the package to avoid coupling noise into the high-impedance CMOS inputs. Use a ground plane on the layer beneath the op amp to maintain the 115 dB CMRR at high frequencies.
The OPA735 does not have rail-to-rail inputs - the common-mode voltage range extends only to within 1.5 V of V-. Exceeding this range distorts the input stage and can introduce permanent damage. For input signals approaching V-, use the OPA2277UA or MCP6072T-E/SN instead. Auto-zero amplifiers also generate small clock-feedthrough spurs at the switching frequency; avoid using the OPA735 in audio-frequency signal paths where these spurs are audible.
At unity gain, the 1.6 MHz GBW supports signal bandwidth up to ~160 kHz with 12 dB of headroom. For higher-frequency signals or sharper anti-alias filters, use a faster op amp such as the OPA354 (250 MHz). When driving capacitive loads above 100 pF, add a 50 ohm series resistor at the output to maintain phase margin; the OPA735 is stable for capacitive loads up to 1 nF without compensation.
규정 준수 정보
RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified; for automotive applications verify with TI. Halogen-free status not explicitly stated in the available data.
