OPA27GP - 4.5nV/√Hz, 8MHz, 8-PDIP Amplifier | Texas Instruments
MPN: OPA27GP ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
OPA27GP Overview
An operational amplifier is a voltage-controlled, high-gain analog building block used to amplify or buffer signals. The OPA27 belongs to the precision-operational-amplifier hierarchy, which is part of the broader amplifier-IC and semiconductor categories. Its differential input stage compares two voltages and drives an output according to feedback, allowing engineers to configure stable gain, filtering, summing, and current-control circuits.
The OPA27's 4.5 nV/√Hz maximum noise at 1 kHz, 100 µV maximum offset, and 0.4 µV/°C maximum offset drift support accurate measurement of low-level signals. Its 117 dB minimum open-loop gain, 100 dB minimum common-mode rejection, and 94 dB minimum power-supply rejection improve rejection of unwanted common-mode and supply-related disturbances. Unity-gain stability removes the minimum-gain constraint associated with the decompensated OPA37.
Texas Instruments describes the OPA27 as a precision monolithic amplifier using bias-current cancellation and laser-trimmed thin-film resistors. Those techniques support low offset and stable long-term behavior. The amplifier has an 8 MHz bandwidth and a 3.4 V/µs slew rate, allowing it to process small signals while preserving useful large-signal dynamics. The manufacturer datasheet states that bias and offset-current specifications are maintained over the full -40°C to +85°C range.
Typical uses include low-noise audio preamplification, bridge-based sensor interfaces, precision current measurement, low-level transducer amplification, laboratory instrumentation, and buffer stages following high-impedance sensors. Noise and offset determine the smallest useful input, while input bias current, common-mode range, output swing, supply voltage, and stability determine whether the selected operating point is electrically suitable.
When replacing an existing OP-05, AD510, or AD517 socket design, verify pin mapping and all electrical limits rather than relying only on package shape. Decouple each power pin locally, avoid placing high-impedance input traces beside noisy output or compensation paths, and use guarding if leakage or surface contamination can disturb the input. This page combines verified manufacturer data, sourcing information, replacement constraints, and application guidance for design review and procurement.
Drop-in alternatives for OPA27GP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesOPA27GP Maximum Ratings & Electrical Characteristics
| Amplifier Type | Single operational amplifier |
| Voltage Noise Density | 4.5 nV/√Hz maximum at 1 kHz |
| Input Offset Voltage | 100 µV maximum |
| Input Offset Drift | 0.4 µV/°C maximum |
| Open-Loop Gain | 117 dB minimum |
| Gain-Bandwidth Product | 8 MHz |
| Slew Rate | 3.4 V/µs |
| Common-Mode Rejection | 100 dB minimum |
| Power-Supply Rejection | 94 dB minimum |
| Gain Stability | Unity-gain stable |
| Operating Temperature Range | -40°C to +85°C |
| Package | 8-pin PDIP (P) |
| Pin Count | 8 pins |
| Mounting Type | Through-hole |
| RoHS Compliance | RoHS-compliant |
| Socket Compatibility | Industry-standard 8-pin DIP sockets; fits OP-05, AD510, and AD517 sockets |
OPA27GP 8-pin pdip (p) Pin Configuration Guide
Pin configuration for OPA27GP (8-pin pdip (p) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for OPA27GP.
Refer to the datasheet for full pin configuration.
Typical Applications
OPA27GP is suitable for 6 applications: Precision Audio Preamplifier, Low-Level Sensor Signal Conditioning, Precision Current Measurement, Laboratory Instrumentation Front End, Industrial Transducer Interface, Data Converter Input Buffer.
Precision Audio Preamplifier
The OPA27GP fits low-noise audio preamplification because its verified noise density is 4.5 nV/√Hz maximum at 1 kHz, while its 8 MHz bandwidth and 3.4 V/µs slew rate preserve small-signal detail. It is unity-gain stable, allowing either direct voltage gain or feedback-network gain. Place the device close to the source and return, decouple its supply pins locally, and keep output routing away from the high-impedance input. The main tradeoff is the 8-pin through-hole package rather than a compact surface-mount option.
Recommended
Low-Level Sensor Signal Conditioning
OPA27GP is appropriate for low-level sensor conditioning when source noise, offset drift, and common-mode error must remain small. Its 100 µV maximum offset, 0.4 µV/°C maximum drift, 100 dB minimum common-mode rejection, and 117 dB minimum open-loop gain support accurate closed-loop measurements. Use guarding and a grounded shield around high-impedance inputs, verify the actual common-mode range, and select feedback resistors that preserve stability. Compared with a general-purpose amplifier, its documented precision specifications provide more margin.
Recommended
Precision Current Measurement
OPA27GP can amplify the voltage generated by a shunt or current-sense element when small full-scale signals and DC accuracy matter. The 4.5 nV/√Hz maximum noise reduces input-referred amplifier noise, while 100 µV maximum offset and 94 dB minimum power-supply rejection help suppress errors in regulated systems. Keep shunt and feedback copper compact, account for amplifier bias-current error, and confirm that the common-mode voltage remains in range. The unity-gain-stable device also supports direct buffer configurations when required.
Recommended
Laboratory Instrumentation Front End
OPA27GP suits laboratory buffer and gain stages that must preserve small AC signals while maintaining DC precision. Its 8 MHz gain-bandwidth supports moderate-bandwidth measurements, and unity-gain stability allows direct voltage following without the minimum gain imposed by the OPA37. Use short, shielded signal paths, clean analog grounding, and verified bypass capacitors. The through-hole PDIP package simplifies bench wiring and socketed prototypes, although a modern surface-mount precision amplifier may be preferable in compact production instruments.
Recommended
Industrial Transducer Interface
OPA27GP can condition weak transducer outputs when the system requires low input-referred noise and excellent common-mode rejection. The verified 100 dB minimum CMRR, 100 µV maximum offset, and 0.4 µV/°C maximum drift are particularly useful when the useful signal changes slowly near the amplifier's offset floor. Place the amplifier near the transducer connector, maintain a stable reference ground, and avoid routing near motors or switching converters. Environmental qualification remains unverified, so industrial suitability should be assessed at the system level.
Recommended
Data Converter Input Buffer
OPA27GP can serve as a buffer or gain stage ahead of a high-resolution data converter when the source has low amplitude and the converter requires low-noise drive. Its 4.5 nV/√Hz maximum noise, 3.4 V/µs slew rate, and unity-gain stability support signal conditioning without the decompensated minimum gain required by OPA37. Confirm converter input capacitance, settling requirements, output-voltage range, and operating supply before selection. Place the amplifier near the converter and use a quiet return plane to minimize added conversion error.
Recommended
Recommended Products Summary
Engineering reference data for OPA27GP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 8-pin PDIP (P) |
| Brand | Texas Instruments |
| Voltage Noise Density | 4.5 nV/√Hz maximum at 1 kHz |
| Input Offset Voltage | 100 µV maximum |
| Input Offset Drift | 0.4 µV/°C maximum |
| Open-Loop Gain | 117 dB minimum |
| Gain-Bandwidth Product | 8 MHz |
| Slew Rate | 3.4 V/µs |
| Unity-Gain Stability | Yes |
| Operating Temperature Range | -40°C to +85°C |
Key Differentiators
- Unity-gain operation distinguishes the target from the decompensated sibling (vs OPA37 family)
- Low voltage noise supports precision small-signal amplification (vs OPA27GPG4)
- Through-hole package simplifies socketed upgrades (vs Surface-mount precision amplifiers)
Design Notes
Keep the OPA27GP input pins, feedback components, and output path compact and away from switching nodes. For high-impedance sources, use guarding and a quiet analog ground because 4.5 nV/√Hz maximum noise does not eliminate errors caused by leakage, contaminated boards, or induced pickup. The verified 100 dB minimum common-mode rejection helps only when the input common-mode voltage remains inside its permitted operating range.
Use the shortest practical connection from each power terminal to its bypass capacitor and ground return. The supplied excerpts do not specify a required capacitor value, so follow the relevant manufacturer application guidance rather than selecting an invented capacitance. Validate DC offset at the actual supply voltage and output settling into the load; the 94 dB minimum power-supply rejection is a minimum specification, not a guarantee of complete immunity from a switching supply.
Do not substitute the decompensated OPA37 at unity gain. Texas Instruments specifies OPA27 for unity-gain stability but requires closed-loop gain of at least 5 for OPA37. Likewise, an 8-pin DIP footprint alone does not prove replacement compatibility. Verify pin functions, common-mode input range, output swing, supply voltage, bias current, offset, noise, and stability for every candidate before approval.
Analyze both small-signal noise and large-signal settling. The verified 8 MHz bandwidth and 3.4 V/µs slew rate provide useful dynamic performance, but the 100 µV maximum offset can dominate a very small DC signal. Use the actual source impedance, bandwidth, load capacitance, and feedback topology in simulation, and preserve enough loop gain in the selected closed-loop configuration.
Compliance Information
A distributor source identifies OPA27GP as RoHS-compliant and compatible with an industry-standard 8-pin DIP socket. No verified REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was supplied.