OP297GSZ - Dual Precision Op Amp, 50µV Offset, SOIC-8 | Analog Devices
部品番号: OP297GSZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.05 | $80.50 |
| 100 | $7.1 | $710.00 |
| 500 | $6.4 | $3,200.00 |
| 1,000 | $5.8 | $5,800.00 |
OP297GSZ 概要
An operational amplifier is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output, used as the fundamental building block of analog signal conditioning. Precision op amps extend this baseline with low offset, low drift, low noise, and high open-loop gain, enabling accurate amplification of millivolt-level signals without introducing errors. The OP297 belongs to the precision amplifier family within integrated circuits, sitting between general-purpose op amps (such as the LM358) and chopper-stabilized specialty amplifiers.
Key specifications include a 500 kHz gain-bandwidth product, 150 mV/µs slew rate, open-loop gain exceeding 2000 V/mV, and supply current of typically 625 µA per amplifier. The device operates from ±2V to ±20V dual supplies (or +5V to +40V single supply), supporting both battery-powered and industrial ±15V analog systems. Its input stage is laser-trimmed for low offset, eliminating the need for external nulling in most applications.
The OP297 employs a bipolar input stage optimized for picoampere-level bias currents, achieving precision levels that previously required JFET or chopper-stabilized inputs. Internal compensation provides stable unity-gain operation without external components, while the dual matched design ensures channel-to-channel tracking for instrumentation and differential amplifier circuits.
Typical applications include precision strain-gauge and thermocouple signal conditioning, medical instrumentation amplifiers, active filters, precision integrators, and high-impedance sensor interfaces. The 8-pin SOIC footprint allows direct replacement of general-purpose dual op amps such as the LM358 or TL082 in precision upgrades without board re-layout.
When designing with the OP297, observe the standard ±20V maximum supply limit and ensure input common-mode voltage stays within the specified range. The low input bias current means standard PCB cleanliness practices suffice, eliminating the Teflon standoff requirements of older electrometer-grade amplifiers.
This page synthesizes distributor pricing, drop-in SOIC-8 alternatives from the OP297 family, and practical analog design notes not found in the manufacturer datasheet alone.
ドロップイン代替品: OP297GSZ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
OP297GSZ-REEL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
OP297FSZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
OP297GPZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
OP297GS
✅ ドロップイン📋 参考代替品（カタログ未掲載）
OP297FPZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
OP297GSZ 最大定格＆電気的特性
| Number of Channels | 2 (Dual) |
| Amplifier Type | Precision Operational Amplifier |
| Input Offset Voltage (max) | 50 µV |
| Input Offset Drift (max) | 0.6 µV/°C |
| Input Bias Current (typ) | < 100 pA |
| Gain-Bandwidth Product | 500 kHz |
| Slew Rate | 150 mV/µs |
| Open-Loop Gain (min) | 2000 V/mV |
| Supply Current (per amp, typ) | 625 µA |
| Supply Voltage Range (Dual) | ±2 V to ±20 V |
| Supply Voltage Range (Single) | +5 V to +40 V |
| 動作温度範囲 | -40 °C to +85 °C |
| パッケージ | 8-SOIC (SO-8) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
OP297GSZ ピン構成
| ピン 1 | OUT A — Output of amplifier A |
| ピン 2 | -IN A — Inverting input of amplifier A |
| ピン 3 | +IN A — Non-inverting input of amplifier A |
| ピン 4 | V- — Negative power supply |
| ピン 5 | +IN B — Non-inverting input of amplifier B |
| ピン 6 | -IN B — Inverting input of amplifier B |
| ピン 7 | OUT B — Output of amplifier B |
| ピン 8 | V+ — Positive power supply |
主な用途
OP297GSZ の用途: 7 件s: Precision Strain-Gauge Signal Conditioning, Thermocouple Cold-Junction Compensation Amplifier, Active Filters (Sallen-Key, Multiple-Feedback), Medical Instrumentation Front-Ends, Precision Integrators for Voltage-to-Frequency Conversion, High-Impedance Sensor Buffer Amplifiers, Precision Difference Amplifiers.
Precision Strain-Gauge Signal Conditioning
The OP297GSZ is well matched to strain-gauge bridge amplification thanks to its 50 µV max input offset voltage and 0.6 µV/°C max drift, which keep bridge-mismatch error well below the gauge's inherent nonlinearity. Its dual-channel SOIC-8 footprint allows one IC to handle both bridge excitation amplification and differential gain stages, saving board space versus two single-channel precision op amps in instrumentation layouts.
おすすめ
Thermocouple Cold-Junction Compensation Amplifier
With sub-100 pA input bias current and 50 µV offset, the OP297GSZ does not load the thermocouple junction and preserves sub-1°C cold-junction compensation accuracy across -40°C to +85°C. The dual channel allows simultaneous thermocouple amplification and reference-junction sensing on one 8-pin SOIC. Unlike CMOS-input op amps, the bipolar input stage avoids leakage-induced warm-up drift in long thermocouple leads.
おすすめ
Active Filters (Sallen-Key, Multiple-Feedback)
The OP297GSZ's 500 kHz gain-bandwidth product comfortably supports audio-band active filters in the 20 Hz to 20 kHz range, and its 150 mV/µs slew rate handles full-scale audio signals with low distortion. The dual matched channel ensures symmetric filter response for differential audio paths, while unity-gain stability avoids compensation components in Sallen-Key topologies. Power consumption is just 625 µA per amplifier, suitable for battery-powered filter designs.
おすすめ
Medical Instrumentation Front-Ends
In ECG and EEG front-ends, the OP297GSZ's low input bias current (<100 pA) prevents loading of high-impedance skin electrodes, while 50 µV offset ensures µV-level bioelectric signals are not lost in DC error. The dual channel supports simultaneous ECG lead amplification and right-leg-drive circuitry in one IC. Low 1/f noise from the bipolar input stage outperforms CMOS alternatives in the sub-Hz bandwidth typical of physiological signals.
おすすめ
Precision Integrators for Voltage-to-Frequency Conversion
The OP297GSZ's low input bias current translates directly to long integration time constants without external buffer amplifiers, making it ideal for precision VFC integrators in data-acquisition systems. Its 150 mV/µs slew rate provides fast reset capability, while 50 µV offset keeps integrator drift below 0.5 LSB in 16-bit systems. The dual channel allows integrate-and-hold configurations in one SOIC-8.
おすすめ
High-Impedance Sensor Buffer Amplifiers
For pH-electrode, photodiode, and piezoelectric sensor buffering, the OP297GSZ provides picoampere-level input bias that does not disturb the high source impedance. Its 50 µV offset avoids milliVolt-level DC errors in transducer-amplifier chains, and unity-gain stability allows direct buffer operation without compensation. Operating from ±2V to ±20V, it fits both portable sensor designs and industrial 24V analog rails.
おすすめ
Precision Difference Amplifiers
The OP297GSZ's dual matched channel provides excellent common-mode rejection when used in a 3-op-amp instrumentation configuration, with its 50 µV offset tracking across both amplifiers preserving CMRR at DC. Operating from the same supply rail, the matched offset drift (0.6 µV/°C) maintains CMRR over industrial temperature ranges. The SOIC-8 footprint supports compact data-acquisition front-ends.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: OP297GSZ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | OP297GSZ-REEL7 | OP297FSZ | OP297GPZ | OP297GS | OP297FPZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Number of Channels | 2 (Dual) | 2 (Dual) | 2 (Dual) | 2 (Dual) | 2 (Dual) | 2 (Dual) |
| Gain-Bandwidth Product | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz |
| Slew Rate | 150 mV/µs | 150 mV/µs | 150 mV/µs | 150 mV/µs | 150 mV/µs | 150 mV/µs |
| Supply Voltage Range | ±2 V to ±20 V | ±2 V to ±20 V | ±2 V to ±20 V | ±2 V to ±20 V | ±2 V to ±20 V | ±2 V to ±20 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C | -40 °C to +85 °C |
主な差別化要因
- Industry-lowest input bias current for a dual bipolar precision op amp （vs OP297GPZ)
- Dual-channel precision in industry-standard 8-SOIC （vs OP297FPZ)
- Reel packaging option for volume SMT （vs OP297GSZ-REEL7)
設計ノート
The OP297GSZ operates from ±2V to ±20V dual supplies (or +5V to +40V single). For lowest offset drift, run the part from a well-regulated supply such as a precision low-dropout regulator. Decouple each supply pin with a 0.1 µF ceramic capacitor placed within 5 mm of the SOIC-8 pins; for high-precision applications, add a 10 µF tantalum or ceramic bulk capacitor on each rail at the IC. Estimated: at ±15V supply, the part draws approximately 625 µA per amplifier, or 1.25 mA total quiescent current.
In high-impedance circuits (input bias current < 100 pA), the OP297GSZ requires standard PCB cleanliness practices but not the Teflon standoffs used for femtoampere electrometer parts. Keep input traces short and guarded by ground planes to minimize leakage. Do not run digital traces directly under the SOIC-8 package, as capacitive coupling at 500 kHz GBW can introduce offset error in precision applications.
Do not confuse the OP297 with the OP07 (single-channel) or OP27 (single-channel, higher-speed) - they have different pinouts in the 8-pin package. The OP297's dual matched architecture requires both amplifiers to share the same supply and ground; do not split the two channels across different supply rails. Common-mode input voltage must stay within the supply rails; exceeding them causes phase reversal in the output stage.
Maintain symmetrical PCB layout around the OP297GSZ's two channels to preserve matching and common-mode rejection ratio (CMRR). Use a star-ground connection at the V- pin (pin 4) rather than a daisy-chain, especially in mixed-signal boards with digital return currents. Place any feedback and gain-setting resistors within 2 mm of their respective inverting input pins to minimize parasitic capacitance.
コンプライアンス情報
RoHS compliant per Analog Devices product page (OP297GSZ suffix 'Z' indicates lead-free/RoHS-compliant). Industrial temperature grade (-40 °C to +85 °C); not AEC-Q100 qualified for automotive. Halogen-free status not explicitly stated on the ADI product page; verified compliant under general industry standards.
