OP470GSZ - 5nV/√Hz Quad Op-Amp, 16-SOIC | Analog Devices
部品番号: OP470GSZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $14.26 | $14.26 |
| 10 | $12.82 | $128.20 |
| 100 | $11.05 | $1,105.00 |
| 500 | $9.78 | $4,890.00 |
| 1,000 | $8.94 | $8,940.00 |
OP470GSZ 概要
An operational amplifier is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output, used as a building block in nearly every analog signal chain. The OP470 belongs to the precision op-amp sub-category (hypernym hierarchy: operational amplifier → amplifier IC → analog IC → semiconductor device), characterized by ultra-low noise, low offset voltage, and high open-loop gain. It is produced on a bipolar process that yields the combination of very low input-referred voltage noise, low input bias current, and high DC accuracy required for instrumentation applications.
Key features include a maximum input offset voltage of 0.4 mV (typical 0.1 mV), an offset voltage drift of 2 µV/°C maximum, an open-loop gain of 1000 V/mV minimum, and a common-mode rejection ratio (CMRR) of 110 dB minimum. The quad topology, low quiescent current per amplifier, and absence of crossover distortion support use in low-noise audio, active filter, and multi-channel instrumentation designs that demand channel-to-channel matching.
The OP470 architecture uses laser-trimmed thin-film resistors and a thermally balanced layout to minimize offset and drift. Its low noise density and high gain make it suitable for amplifying low-level transducer signals, while the 6 MHz GBW comfortably handles audio-bandwidth and modest servo-loop applications. The output stage is class A/AB and swings within approximately 2 V of each rail on heavy loads, preserving headroom in ±15 V systems.
Typical applications include professional audio mixing consoles and microphone preamplifiers, precision multi-channel data-acquisition front ends, active filters and equalizers, medical instrumentation such as ECG and patient-monitoring analog front ends, and industrial process-control signal conditioning where four matched low-noise channels reduce circuit complexity. Industrial sensor signal conditioning and strain-gauge amplification also benefit from the quad precision topology.
When designing with this part, bias-current-cancellation paths must be considered at the inputs because the OP470 is a bipolar device. Source impedances above a few tens of kilo-ohms can introduce offset errors that exceed the datasheet spec unless cancellation is added. Decouple each supply pin with a 0.1 µF ceramic plus a bulk tantalum/electrolytic capacitor placed as close to the package as possible.
This page synthesizes distributor pricing, drop-in cross-references, and practical design notes for the OP470GSZ, extending the manufacturer datasheet with selection guidance and comparisons not found at a single OEM source.
ドロップイン代替品: OP470GSZ — 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。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: OP470GSZ （同一形状・フットプリント） — 相違点: Amplifier Type, Input Voltage Noise Density, Operating Temperature Range, Packaging.
クイック比較ツール — 並列比較する代替部品を選択:
OP471GSZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
OP470GSZ-REEL
✅ ドロップイン✓ 在庫あり
$10.1 / 個
データシートを見る →OP470GPZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
OP470GSZ 最大定格＆電気的特性
| Manufacturer | Analog Devices |
| Amplifier Type | General Purpose / Precision |
| Number of Circuits | 4 (Quad) |
| Gain Bandwidth Product | 6 MHz |
| Slew Rate | 2 V/µs |
| Input Offset Voltage (Max) | 0.4 mV |
| Offset Voltage Drift (Max) | 2 µV/°C |
| Input Voltage Noise Density | 5 nV/√Hz (max @ 1 kHz) |
| Open-Loop Gain (Min) | 1000 V/mV (1,000,000 V/V) |
| CMRR (Min) | 110 dB |
| Supply Voltage Range (Dual) | ±4.5 V to ±18 V |
| 動作温度範囲 | -40°C to +85°C |
| パッケージ / ケース | 16-SOIC (0.295 inch / 7.50 mm body) |
| 実装タイプ | Surface Mount |
| Packaging | Tube (GSZ suffix) |
| RoHS ステータス | Compliant |
OP470GSZ ピン構成
| ピン 1 | OUTA — Amplifier A output |
| ピン 2 | -INA — Amplifier A inverting input |
| ピン 3 | +INA — Amplifier A non-inverting input |
| ピン 4 | V+ — Positive supply |
| ピン 5 | +INB — Amplifier B non-inverting input |
| ピン 6 | -INB — Amplifier B inverting input |
| ピン 7 | OUTB — Amplifier B output |
| ピン 8 | OUTC — Amplifier C output |
| ピン 9 | -INC — Amplifier C inverting input |
| ピン 10 | +INC — Amplifier C non-inverting input |
| ピン 11 | V- — Negative supply |
| ピン 12 | +IND — Amplifier D non-inverting input |
| ピン 13 | -IND — Amplifier D inverting input |
| ピン 14 | OUTD — Amplifier D output |
| ピン 15 | NC — Not connected (per datasheet) |
| ピン 16 | NC — Not connected (per datasheet) |
主な用途
OP470GSZ の用途: 6 件s: Professional Audio Microphone Preamplifier, Multi-Channel Strain-Gauge Signal Conditioning, Active Audio Filter and Equalizer Stages, Medical Instrumentation Front-End, Industrial Process-Control Signal Conditioning, Precision Multi-Channel Data Acquisition Front End.
Professional Audio Microphone Preamplifier
The OP470GSZ suits studio microphone preamplifiers because each of its four channels delivers 5 nV/√Hz maximum voltage noise at 1 kHz and CMRR of at least 110 dB, ensuring the signal-to-noise ratio is set by the microphone element rather than the front-end electronics. Per the OP470 datasheet, the bipolar input stage draws modest bias current that flows through 1 kΩ source impedances without introducing measurable offset, which is essential for balanced XLR inputs. The 6 MHz GBW comfortably covers the 20 Hz-20 kHz audio band with phase margin above 60° even at unity gain, and the four matched channels on one die hold channel-to-channel gain matching within 1 dB across a stereo or surround bus. A typical design uses the OP470 in an inverting 40 dB mic topology with a 1 kΩ gain set resistor and a 22 kΩ feedback resistor, delivering EIN below -128 dBu when paired with a 200 Ω microphone.
おすすめ
Multi-Channel Strain-Gauge Signal Conditioning
The OP470GSZ fits four-channel load-cell and strain-gauge signal-conditioning boards where low offset (0.4 mV maximum) and low drift (2 µV/°C) keep the bridge excitation accuracy across industrial temperature swings. The datasheet specifies 1000 V/mV minimum open-loop gain, supporting 1 mV/V full-scale bridge outputs amplified to ±10 V without measurable linearity error. Sharing one silicon die means the four channels track each other in offset over temperature, which is critical for differential bridge measurements where common-mode drift across channels would otherwise corrupt the reading. A typical conditioning stage uses one OP470GSZ to amplify two half-bridge load cells and two quarter-bridge sensors, each in an instrumentation-style topology with the OP470 acting as the difference amplifier; the bipolar input stage bias current (~tens of nA) flows through the bridge legs and must be accounted for in calibration.
おすすめ
Active Audio Filter and Equalizer Stages
The OP470GSZ works as the active element in multi-band audio equalizers and active crossovers because four channels per IC enable a stereo 2-way crossover plus the high-pass and low-pass make-up stages all on one device. The 6 MHz GBW extends well above the 20 kHz audio cutoff so filter Q and damping remain accurate across the band, and the 2 V/µs slew rate is more than sufficient for line-level signals at full audio bandwidth. Low distortion and the absence of crossover artifacts (typical bipolar output stage) preserve audio transparency. A typical two-way stereo crossover uses each OP470GSZ channel as a Sallen-Key second-order filter: one section rolls off the tweeter above 3 kHz, a second rolls off the woofer below 3 kHz, while a third channel serves as the tweeter level make-up buffer and the fourth as the woofer buffer.
おすすめ
Medical Instrumentation Front-End
The OP470GSZ is appropriate for medical ECG, patient-monitoring, and bio-potential analog front-ends where 5 nV/√Hz maximum voltage noise floor preserves the micro-volt cardiac signals above the amplifier's own noise contribution. The datasheet's 0.4 mV maximum input offset voltage keeps DC baseline drift low enough that small mV-amplitude ECG features remain visible after AC coupling, and the 110 dB CMRR rejects 50/60 Hz mains interference on the patient cable. Four channels on one die simplify multi-lead ECG boards: lead I, lead II, lead III, and a reference/RL drive can each occupy one OP470GSZ channel. Designers should add input-protection resistors (typically 10 kΩ) and AC-couple with 10 µF film capacitors to handle defibrillator pulses; the IC survives the standard IEC 60601-1 patient-protection tests when combined with external gas-discharge or TVS protection.
おすすめ
Industrial Process-Control Signal Conditioning
The OP470GSZ handles 4-20 mA current-loop receivers, RTD excitation buffers, and thermocouple cold-junction compensation in industrial process-control boards. Its ±4.5 V to ±18 V supply range covers the 24 V industrial rail after regulation, and the 1000 V/mV minimum open-loop gain holds gain accuracy over temperature and supply variation. The four matched channels keep multi-point temperature scans (for example, eight thermocouples read through two OP470GSZs and a mux) with predictable channel-to-channel gain error. A typical thermocouple front-end uses two OP470GSZs: one to amplify the thermocouple via a precision INA, and one to condition the cold-junction sensor signal before ADC entry. The bipolar input stage is robust against the input over-voltage transients seen in industrial plants when paired with external TVS protection at the field wiring terminals.
おすすめ
Precision Multi-Channel Data Acquisition Front End
The OP470GSZ is well matched to precision multi-channel data-acquisition boards front-ending successive-approximation ADCs at 16 to 18 bits. With 0.4 mV maximum input offset and 2 µV/°C drift, the amplifier errors contribute less than 1 LSB at 16 bits for ±10 V input ranges, and four matched channels per IC simplify multiplexer layouts. The datasheet's 5 nV/√Hz maximum noise density, integrated over the closed-loop bandwidth, keeps total input-referred noise well below the ADC's quantization noise. A typical SAR-ADC front-end uses one OP470GSZ as four unity-gain buffers driving a 4:1 analog multiplexer, with each channel preceded by an RC anti-aliasing filter. Designers should verify the OP470's input bias current contribution to MUX on-resistance and add a low-leakage JFET buffer ahead of very-high-impedance sensor sources.
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: OP470GSZ — 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 | OP471GSZ | OP470GSZ-REEL | OP470GPZ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-SOIC wide-body (0.295 inch) | 16-SOIC wide-body (0.295 inch) - same | 16-SOIC wide-body (0.295 inch) - same | 14-PDIP - through-hole, different footprint |
| Slew Rate | 2 V/µs | 8 V/µs | 2 V/µs | 2 V/µs |
| Gain Bandwidth Product | 6 MHz | 6.5 MHz (typical) | 6 MHz | 6 MHz |
| Input Voltage Noise Density (max @ 1 kHz) | 5 nV/√Hz | 6 nV/√Hz | 5 nV/√Hz | 5 nV/√Hz |
| Input Offset Voltage (max) | 0.4 mV | 0.4 mV | 0.4 mV | 0.4 mV |
| CMRR (min) | 110 dB | 110 dB | 110 dB | 110 dB |
| Supply Voltage Range (dual) | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V |
| Packaging Format | Tube (GSZ) | Tube | Tape and Reel | Tube (PDIP) |
主な差別化要因
- Four matched channels on one die for tight channel-to-channel tracking （vs OP471GSZ)
- Lower noise floor at equal slew rate （vs General-purpose quad op-amps such as LM148)
- 16-SOIC wide-body package for surface-mount designs （vs OP470GPZ 14-pin PDIP)
設計ノート
Decouple each supply pin of the OP470GSZ with a 0.1 µF X7R ceramic placed within 2 mm of the package, in parallel with a 10 µF tantalum or electrolytic bulk cap. The OP470 draws up to roughly 11 mA total quiescent current (estimated: 2.75 mA per amplifier × 4 channels); choosing the bulk capacitor so its impedance at 100 kHz falls below the regulator's output impedance avoids noise coupling through the supply rail into all four channels simultaneously. A ferrite bead on the supply trace between the regulator and the OP470GSZ adds 20-30 dB of PSRR at the troublesome 1-10 MHz range, where the internal supply rejection begins to roll off.
The OP470GSZ dissipates up to approximately 500 mW (estimated: ~11 mA × 36 V worst case plus output stage losses) in a 16-SOIC wide-body package rated at ~100 °C/W θJA on a 4-layer JEDEC board. In a ±18 V dual-supply audio preamp with 600 Ω line-driving load, the dissipation can rise to ~700 mW, requiring 100 mm² of top-side copper pour or a 2 mm² thermal via array to the bottom layer. Keep the OP470GSZ away from heat-generating elements (regulators, output stages, transformers) so bias current drift stays within the 2 µV/°C specification rather than degrading on the local thermal gradient.
Lay out the four channels symmetrically so channel-to-channel offset and gain mismatch track equally. Keep input traces short and guarded: place a ground trace between adjacent amplifier inputs and route the -IN traces above the ground plane to minimize capacitive coupling that would form a stray feedback path. Avoid routing input traces over digital signals on adjacent layers; even 5 mV of digital coupling through 1 pF of stray capacitance can break the 110 dB CMRR claim at high frequencies. Place a 5 mm² copper pour tied to V- immediately under the package to give the power stage a low-impedance return.
The bipolar input stage of the OP470 draws tens of nA of input bias current - do not use it directly with source impedances above ~50 kΩ without bias-current cancellation resistors. Selecting a feedback resistor value above 100 kΩ also degrades noise performance; noise gain grows with the resistor ratio and the OP470's 5 nV/√Hz floor can rise by 2-3×. Capacitive loads above 50 pF on the output can cause peaking or oscillation; isolate them with a 50 Ω series resistor or by placing the feedback capacitor across the upper feedback resistor for unity-gain buffers.
コンプライアンス情報
The trailing Z in OP470GSZ denotes RoHS lead-free (Pb-free) packaging per Analog Devices ordering information. Reach declaration available via ADI product page. AEC-Q100 not applicable - this is an industrial/consumer-grade operational amplifier; for automotive qualified low-noise quad op amps see ADI's automotive-grade portfolio. Conflict-mineral statement issued by ADI through corporate compliance program.
