OPA2107AU - Dual 4.5MHz Precision DifET Op Amp | Texas Instruments
部品番号: OPA2107AU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $12.28 | $12.28 |
| 10 | $11.55 | $115.50 |
| 100 | $10.82 | $1,082.00 |
| 500 | $10.09 | $5,045.00 |
| 1,000 | $9.36 | $9,360.00 |
OPA2107AU 概要
An operational amplifier is a high-gain DC-coupled voltage amplifier with differential inputs and a single-ended output, forming the foundational building block of the analog signal chain hierarchy: op amp -> amplifier IC -> analog front end -> signal conditioning system. Precision FET-input op amps like the OPA2107 combine JFET input stages with laser-trimmed thin-film resistors to achieve very low input bias current without sacrificing DC accuracy, a combination bipolar-input devices cannot match for high-impedance sources.
Key features include very low noise at 10 kHz, low offset voltage of 1 mV maximum, low offset drift of 10 µV/°C maximum, and fast settling to 0.01%, while remaining unity-gain stable. The 40 mA per-channel output drive and 80 dB open-loop gain make it suitable for driving ADC inputs and cables directly.
The DifET dielectrically isolated process isolates each transistor, reducing junction capacitance and enabling the high slew rate and fast settling that conventional JFET processes cannot deliver. Input bias current of only a few picoamperes allows megohm-level source impedances with minimal DC error, and the dual-channel integration halves board space versus two singles while improving thermal tracking between channels.
Typical applications include data acquisition front ends, DAC output buffers, optoelectronic receivers (photodiode transimpedance amplifiers), and high-impedance sensor conditioning such as pH probes and piezoelectric accelerometers.
Design consideration: preserve DC accuracy by guarding the high-impedance input node on the PCB and keeping feedback resistor values moderate, since the 10 pA bias current through 1 MΩ already contributes 10 µV of error.
This page synthesizes distributor pricing, pin-compatible alternatives, and practical design guidance not found in the manufacturer datasheet alone.
ドロップイン代替品: OPA2107AU — 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: OPA2107AU （同一形状・フットプリント） — 相違点: Package, Slew Rate, Supply Voltage Range, Amplifier Type, Gain-Bandwidth Product.
クイック比較ツール — 並列比較する代替部品を選択:
OPA2134UA/2K5
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$1.45 / 個
データシートを見る →OPA2132UA
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
OPA2277UA
✅ ドロップイン✓ 在庫あり
$2.95 / 個
データシートを見る →TL072CD
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LF353DT
✅ ドロップイン📋 参考代替品（カタログ未掲載）
OPA2107AU 最大定格＆電気的特性
| Amplifier Channels | 2 (Dual) |
| Gain Bandwidth Product | 4.5 MHz |
| Slew Rate | 18 V/us |
| Supply Voltage Range | +-4.5 V to +-18 V (9 V to 36 V total) |
| Input Bias Current | 10 pA max (4 pA typical) |
| Input Offset Voltage | 1 mV max |
| Offset Voltage Drift | 10 uV/C max |
| Output Current Per Channel | 40 mA |
| Open Loop Gain | 80 dB |
| Settling Time | Fast settling to 0.01% |
| Stability | Unity-gain stable |
| Input Type | DifET (FET) input |
| パッケージ | 8-SOIC (0.154 in, 3.90 mm width), 8 pins |
| 実装タイプ | Surface Mount |
| Product Type | Precision DifET Operational Amplifier |
| Classification | Operational Amplifiers (General Purpose) |
OPA2107AU ピン構成
| ピン 1 | OUT A — Channel A output |
| ピン 2 | -IN A — Channel A inverting input |
| ピン 3 | +IN A — Channel A non-inverting input |
| ピン 4 | V- — Negative supply |
| ピン 5 | +IN B — Channel B non-inverting input |
| ピン 6 | -IN B — Channel B inverting input |
| ピン 7 | OUT B — Channel B output |
| ピン 8 | V+ — Positive supply |
主な用途
OPA2107AU の用途: 6 件s: Data Acquisition Front Ends, DAC Output Amplifiers, Optoelectronics / Photodiode Amplifiers, High-Impedance Sensor Conditioning, Precision Analog Instrumentation, Active Filters and Signal Conditioning.
Data Acquisition Front Ends
The OPA2107AU fits data acquisition front ends because its 4 pA typical input bias current preserves accuracy with high-impedance sensor sources while the 4.5 MHz bandwidth and 18 V/µs slew rate keep the amplifier transparent for multiplexed ADC inputs. TI lists data acquisition as a primary application for this DifET device. In a typical channel, the op amp buffers or gains a sensor signal ahead of a successive-approximation ADC; the fast settling to 0.01% is critical when the mux switches channels and the amplifier must re-settle within an ADC acquisition window. The trade-off versus a precision bipolar part is the 1 mV max offset, which system calibration removes. Use ±15 V supplies to maximize signal headroom ahead of lower-voltage ADCs.
おすすめ
DAC Output Amplifiers
The OPA2107AU is explicitly recommended by TI for DAC output amplifier duty. Current-output DACs require a transimpedance or difference amplifier with fast settling and low bias current at the summing node; the OPA2107AU's 10 pA max input current keeps DAC linearity errors negligible, while 18 V/µs slew rate and fast settling to 0.01% track full-scale output steps without long tails. Operating from ±15 V, it can swing output signals well beyond 5 V rails, useful for audio and instrumentation DACs. The design consideration is noise-to-signal: verify that the op amp's noise at 10 kHz is below the DAC's LSB noise floor for the target resolution. A small feedback capacitor across the transimpedance resistor stabilizes the node against DAC output capacitance.
おすすめ
Optoelectronics / Photodiode Amplifiers
For photodiode receivers, the OPA2107AU's picoampere input bias current is the decisive parameter: with a 1 MΩ transimpedance resistor, 4 pA typical bias contributes only about 4 µV of output error, negligible versus the photodiode signal. TI lists optoelectronics as a target application. The 4.5 MHz gain-bandwidth supports megahertz-class receiver bandwidths with transimpedance gains in the tens of kilo-ohms; the unity-gain-stable DifET design plus a small feedback capacitor (chosen from the photodiode capacitance) guarantees stable transimpedance operation. Because photodiode capacitance reduces phase margin, use the datasheet stability curves when selecting feedback values. Shield and guard the input node to control leakage and EMI pickup in sensitive optical links.
おすすめ
High-Impedance Sensor Conditioning
TI explicitly lists high-impedance sensors among OPA2107 applications. Sensors such as pH electrodes, piezoelectric accelerometers, and pyroelectric detectors present source impedances from megohms to gigaohms; a bipolar-input amplifier would draw microampere bias currents and destroy the measurement, whereas the OPA2107AU's 10 pA max bias keeps error current in the picoampere domain. The 1 mV max offset and 10 µV/°C max drift preserve DC accuracy across industrial temperature excursions. Layout is the dominant error source in practice: guard rings driven by the input follower, PTFE standoffs, and clean flux removal are recommended. Expect input protection diode leakage to dominate if input voltage clamps conduct, so keep inputs within the supply rails at all times.
おすすめ
Precision Analog Instrumentation
In bench and rack instrumentation, the OPA2107AU serves as a precision gain stage where both DC accuracy and bandwidth matter. The laser-trimmed 1 mV max offset and 10 µV/°C drift hold calibration between service intervals, while 4.5 MHz bandwidth preserves signal fidelity in measurement paths up to hundreds of kilohertz with meaningful closed-loop gain. The dual-channel integration in one SOIC-8 halves board area versus two single op amps and gives better channel-to-channel thermal tracking for matched-gain stages such as differential output drivers. Running at ±15 V maximizes dynamic range for 10 V-class measurement signals. For noise-critical front ends, evaluate the device noise at 10 kHz against the system noise budget before finalizing gain distribution.
おすすめ
Active Filters and Signal Conditioning
The OPA2107AU performs well in active filter implementations, including Sallen-Key and multiple-feedback topologies, because its 4.5 MHz gain-bandwidth is roughly 100x a 40 kHz corner frequency, keeping Q and passband gain close to ideal. The unity-gain-stable DifET design tolerates the unity-gain follower configuration used in Sallen-Key stages, and the picoampere bias current permits large-value resistors (1 MΩ class), enabling low-frequency filters with practical capacitor values. Output current of 40 mA per channel drives the next stage or a modest load without additional buffering. Mind the offset: in MFB high-pass topologies the offset is gained up, so budget the 1 mV max offset times noise gain in low-frequency output-level calculations.
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: OPA2107AU — 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 | OPA2134UA | OPA2132UA | OPA2277UA | TL072CD | LF353DT |
|---|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics |
| Gain Bandwidth | 4.5 MHz | 8 MHz | 8 MHz | ~1 MHz | ~3 MHz | 4 MHz |
| Slew Rate | 18 V/us | 20 V/us | 20 V/us | 0.8 V/us | 13 V/us | 13 V/us |
| Input Bias Current | 10 pA max (4 pA typ) | FET input, pA-class | FET input, pA-class | Bipolar-class, higher | JFET, pA-class | JFET, pA-class |
| Offset Voltage | 1 mV max | wider (audio grade) | comparable precision | much lower (uV-class) | several mV | several mV |
主な差別化要因
- DifET process delivers speed with precision （vs TL072CD)
- Faster than precision bipolar alternatives （vs OPA2277UA)
- True dual-channel integration with same-die variants across packages （vs LF353DT)
設計ノート
Guard the high-impedance input node to realize the OPA2107AU's 10 pA bias advantage. Board leakage from flux residue and moisture typically exceeds picoampere levels: surround the +IN/-IN traces with a guard ring driven by the low-impedance follower node or ground-referenced guard, and clean no-clean flux thoroughly. Use 1% or better resistors in the feedback network, and keep feedback resistor values below a few megohms so resistor thermal noise and bias-current error stay within budget.
The 4.5 MHz gain-bandwidth requires supply bypassing that works at high frequency: place a 100 nF ceramic capacitor within 5 mm of each supply pin (pins 4 and 8) plus a 10 uF bulk capacitor per supply rail. Long uncompensated feedback paths or high photodiode/stray capacitance at the inverting node can erode phase margin; add a small feedback capacitor (2-10 pF) in transimpedance configurations to guarantee stable settling to 0.01%.
Do not treat the OPA2107AU as a single-supply, rail-to-rail op amp: it is specified for ±4.5 V to ±18 V dual supplies and its inputs do not approach the negative rail. In single-supply systems, bias inputs above ground with an appropriate virtual ground. Also avoid substituting a generic JFET part (TL072, LF353) in precision paths without revalidating offset and drift - their offsets are several millivolts versus the OPA2107's 1 mV max, a 3-10x accuracy loss.
コンプライアンス情報
Compliance status not stated in the provided verified data; consult the TI product page for current RoHS/REACH declarations.
