Texas Instruments
OPA637AP - 80MHz Precision Difet Op Amp DIP-8 | Texas Instruments
MPN： OPA637AP ✓ 啟用中
100 uV Vdss
5 pA Id
8-PDIP Package
MOQ： 1 |
OPA637AP 概覽
The Texas Instruments OPA637AP is a precision high-speed Difet (dielectrically isolated FET) operational amplifier delivering 80 MHz unity-gain bandwidth and 135 V/us slew rate, supplied in an 8-pin PDIP package and operating from dual supplies of +/-4.5V to +/-18V.
A high-speed operational amplifier is a voltage-feedback amplifier designed to combine wide bandwidth with DC precision, sitting within the hierarchy: op-amp -> precision amplifier -> analog signal conditioning IC -> semiconductor. Where general-purpose amplifiers trade speed for accuracy, precision high-speed parts like the OPA637 preserve both, enabling high-dynamic-range analog signal chains.
Key features of the OPA637AP include a very low maximum offset voltage of 100 uV, a maximum offset drift of 0.8 uV/C, and a maximum input bias current of only 5 pA thanks to the Difet (dielectrically isolated FET) input process. The amplifier settles fast to 0.01% accuracy and is unity-gain bandwidth specified at 80 MHz. Unlike its sibling OPA627, which is unity-gain stable, the OPA637 is stable only at closed-loop gains of 5 or greater - the compensation scheme de-compensates the amplifier to achieve its higher bandwidth, which is why the 80 MHz figure exceeds the OPA627's.
The Difet process uses dielectric isolation rather than junction isolation, sharply reducing input capacitance and leakage. This yields the picoampere-class bias current and low noise typically associated with JFET-input precision amplifiers while preserving the high slew rate needed for fast pulse and wideband AC signals.
Typical applications include wideband data-acquisition front ends, fast pulse amplification in test and measurement instruments, photodiode transimpedance stages with high closed-loop gain, and active filters in precision instrumentation.
A key design consideration: because the OPA637 requires a minimum closed-loop gain of 5 for stability, do not substitute it for the unity-gain-stable OPA627 in follower configurations. Verify noise-gain margins and use good high-frequency PCB layout with short feedback paths.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
A high-speed operational amplifier is a voltage-feedback amplifier designed to combine wide bandwidth with DC precision, sitting within the hierarchy: op-amp -> precision amplifier -> analog signal conditioning IC -> semiconductor. Where general-purpose amplifiers trade speed for accuracy, precision high-speed parts like the OPA637 preserve both, enabling high-dynamic-range analog signal chains.
Key features of the OPA637AP include a very low maximum offset voltage of 100 uV, a maximum offset drift of 0.8 uV/C, and a maximum input bias current of only 5 pA thanks to the Difet (dielectrically isolated FET) input process. The amplifier settles fast to 0.01% accuracy and is unity-gain bandwidth specified at 80 MHz. Unlike its sibling OPA627, which is unity-gain stable, the OPA637 is stable only at closed-loop gains of 5 or greater - the compensation scheme de-compensates the amplifier to achieve its higher bandwidth, which is why the 80 MHz figure exceeds the OPA627's.
The Difet process uses dielectric isolation rather than junction isolation, sharply reducing input capacitance and leakage. This yields the picoampere-class bias current and low noise typically associated with JFET-input precision amplifiers while preserving the high slew rate needed for fast pulse and wideband AC signals.
Typical applications include wideband data-acquisition front ends, fast pulse amplification in test and measurement instruments, photodiode transimpedance stages with high closed-loop gain, and active filters in precision instrumentation.
A key design consideration: because the OPA637 requires a minimum closed-loop gain of 5 for stability, do not substitute it for the unity-gain-stable OPA627 in follower configurations. Verify noise-gain margins and use good high-frequency PCB layout with short feedback paths.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 OPA637AP — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： OPA637AP （相同外形與佔位） — 差異在於 Input Type, Package, Stability.
Texas Instruments
Input Type: JFET (Difet process)
Package: 8-PDIP (DIP-8)
Stability: Stable in closed-loop gain >= 5 (decompensated)
比較對象 OPA637AP →
此產品無可直接替換的替代品。
申請替代品OPA637AP 最大額定值與電氣特性
| Amplifier Type | Precision High-Speed Difet Operational Amplifier |
| Number of Channels | 1 |
| Gain Bandwidth Product | 80 MHz |
| Slew Rate | 135 V/us |
| Input Offset Voltage (max) | 100 uV |
| Offset Voltage Drift (max) | 0.8 uV/C |
| Input Bias Current (max) | 5 pA |
| Settling Time to 0.01% | Fast settling (see manufacturer datasheet for typ value) |
| Supply Voltage Range | +/-4.5 V to +/-18 V |
| Stability | Stable in closed-loop gains of 5 or greater |
| Input Type | Difet (dielectrically isolated FET) |
| 封裝 | 8-PDIP |
| 安裝類型 | Through Hole |
| RoHS 狀態 | unknown |
OPA637AP 腳位配置
| 腳位 1 | TRIM A — Offset voltage trim terminal A (connect to trim potentiometer) |
| 腳位 2 | -IN — Inverting input |
| 腳位 3 | +IN — Non-inverting input |
| 腳位 4 | V- — Negative supply |
| 腳位 5 | NC — Not connected (per datasheet) |
| 腳位 6 | OUT — Output |
| 腳位 7 | V+ — Positive supply |
| 腳位 8 | TRIM B — Offset voltage trim terminal B (connect to trim potentiometer) |
典型應用
OPA637AP 適用於 3 應用s: 訊號調理, 資料擷取, 音訊處理.
訊號調理
使用 OPA637AP 放大與濾波感測器訊號。
資料擷取
使用 OPA637AP 將類比訊號轉換以供數位處理。
音訊處理
使用 OPA637AP 進行音訊訊號放大與處理。
此產品無常見問題。
工程參考資料，適用於 OPA637AP — 比較、設計指引及合規資訊。
合規資訊
RoHS
Unknown
REACH
Unknown
AEC-Q100
Not Applicable
無鉛
Unknown
無鹵
Unknown
衝突礦產
Unknown
Compliance data not present in provided web data; verify on the TI product page before procurement.
資料驗證日期： 2026-09-13
— 資料由 XAIPART 元件工程團隊驗證及整理
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