Texas Instruments
OPA637AP - 80MHz Precision Difet Op Amp DIP-8 | Texas Instruments
MPN: OPA637AP β Active
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100 uV Vdss
5 pA Id
8-PDIP Package
From $1
USD / Unit
MOQ: 1 |
Price updated: 2026-09-13
Volume Pricing
| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1 | $1.00 |
βΉοΈ All prices are in USD
OPA637AP Overview
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.
Drop-in alternatives for OPA637AP β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with OPA637AP (same form factor and footprint) β differing in Input Type, Package, Stability.
Texas Instruments
Input Type: JFET (Difet process)
Package: 8-PDIP (DIP-8)
Stability: Stable in closed-loop gain >= 5 (decompensated)
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| 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) |
| Package | 8-PDIP |
| Mounting Type | Through Hole |
| RoHS Status | unknown |
OPA637AP Pin Configuration
| Pin 1 | TRIM A β Offset voltage trim terminal A (connect to trim potentiometer) |
| Pin 2 | -IN β Inverting input |
| Pin 3 | +IN β Non-inverting input |
| Pin 4 | V- β Negative supply |
| Pin 5 | NC β Not connected (per datasheet) |
| Pin 6 | OUT β Output |
| Pin 7 | V+ β Positive supply |
| Pin 8 | TRIM B β Offset voltage trim terminal B (connect to trim potentiometer) |
Typical Applications
OPA637AP is suitable for 3 applications: Signal Conditioning, Data Acquisition, Audio Processing.
Signal Conditioning
Amplifying and filtering sensor signals using OPA637AP.
Data Acquisition
Converting analog signals for digital processing with OPA637AP.
Audio Processing
Audio signal amplification and processing with OPA637AP.
No FAQ available for this product.
Engineering reference data for OPA637AP β comparison, design guidance, and compliance information.
Compliance Information
RoHS
Unknown
REACH
Unknown
AEC-Q100
Not Applicable
Lead Free
Unknown
Halogen Free
Unknown
Conflict Minerals
Unknown
Compliance data not present in provided web data; verify on the TI product page before procurement.
Data verified on: 2026-09-13
β data verified and curated by XAIPART's component engineering team
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