OP27AJ/883C - Low Noise Precision Op Amp | Analog Devices
MPN: OP27AJ/883C ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $41.67 | $41.67 |
| 10 | $38.5 | $385.00 |
| 100 | $35.2 | $3,520.00 |
| 500 | $32.1 | $16,050.00 |
| 1,000 | $29.8 | $29,800.00 |
OP27AJ/883C Overview
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is a fundamental building block in analog electronics, used in signal conditioning, filtering, and mathematical operations. Op amps are categorized within the broader hierarchy of linear integrated circuits, which also includes comparators, voltage regulators, and instrumentation amplifiers. The OP27 belongs to the precision op amp subcategory, distinguished by low offset voltage, low drift, and low noise, essential for high-accuracy measurement systems.
Key features of the OP27AJ/883C include ultra-low input noise voltage density of 3 nV/√Hz at 1 kHz, ensuring minimal signal degradation in sensitive applications. The device also offers a high open-loop gain of 1.8 million (125 dB), providing excellent linearity and accuracy. Its bipolar input stage with input bias current cancellation achieves low offset and drift without the need for external trimming. The TO-99-8 hermetic package provides robust environmental protection, suitable for harsh military and aerospace environments.
Technically, the OP27 uses a classic bipolar process with a precision laser-trimmed thin-film resistor network to achieve its low offset and drift. The input stage is designed for low noise, with a noise voltage of 3 nV/√Hz and a current noise of 0.4 pA/√Hz. The device is internally compensated for unity-gain stability, simplifying design. It can operate from dual supplies ranging from ±4 V to ±18 V, or single supplies from 8 V to 36 V, offering flexibility in various circuit configurations.
Typical applications include precision instrumentation amplifiers, thermocouple and strain-gauge signal conditioning, active filters, and data acquisition systems. The OP27's low noise and high gain make it suitable for medical instrumentation, such as ECG and EEG amplifiers, where signal integrity is critical. Its military-grade qualification ensures reliable operation in avionics and defense systems.
When designing with the OP27AJ/883C, consider its input bias current of ±40 nA, which may require balancing resistors in high-impedance circuits. Additionally, the TO-99 metal can package requires careful handling to avoid damage to the leads. Proper decoupling of the power supply pins with 0.1 µF capacitors is recommended to maintain stability and reduce noise.
Drop-in alternatives for OP27AJ/883C — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OP27AJ/883
✅ Drop-In📋 Reference alternative (not in catalog)
OP27AJ/883B
✅ Drop-In📋 Reference alternative (not in catalog)
OP27AZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OPA27
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OP27AJ/883C Maximum Ratings & Electrical Characteristics
| Number of Channels | 1 |
| Gain Bandwidth Product | 8 MHz |
| Slew Rate | 2.8 V/µs |
| Input Offset Voltage | 25 µV (max) |
| Input Offset Drift | 0.6 µV/°C (max) |
| Input Bias Current | ±40 nA (max) |
| Input Voltage Noise Density | 3 nV/√Hz at 1 kHz |
| Input Current Noise Density | 0.4 pA/√Hz at 1 kHz |
| Open-Loop Gain | 125 dB (min) |
| Supply Voltage Range | ±4 V to ±18 V |
| Operating Temperature Range | -55°C to +125°C |
| Package | TO-99-8 |
| Mounting Type | Through Hole |
| RoHS Status | Non-Compliant |
| Military Grade | 883C Qualified |
OP27AJ/883C Pin Configuration
| Pin 1 | OFFSET NULL — Offset null adjustment |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC — No connection |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | OFFSET NULL — Offset null adjustment |
Typical Applications
OP27AJ/883C is suitable for 6 applications: Precision Instrumentation Amplifiers, Medical Instrumentation (ECG/EEG), Active Filters, Data Acquisition Systems, Aerospace and Defense Electronics, Test and Measurement Equipment.
Precision Instrumentation Amplifiers
The OP27AJ/883C's low offset voltage (25 µV max) and low drift (0.6 µV/°C) make it ideal for precision instrumentation amplifiers used in strain gauge and thermocouple signal conditioning. Its high open-loop gain of 125 dB ensures accurate amplification of small differential signals. The low noise of 3 nV/√Hz preserves signal integrity in low-level measurements. In a typical bridge amplifier, the OP27 provides the required gain with minimal error, and its military temperature range allows use in harsh environments.
Recommended
Medical Instrumentation (ECG/EEG)
In medical devices like ECG and EEG monitors, the OP27AJ/883C amplifies bioelectric signals that are typically in the microvolt range. Its low input voltage noise of 3 nV/√Hz and low current noise of 0.4 pA/√Hz minimize signal degradation. The high common-mode rejection ratio (CMRR) of 120 dB helps reject interference from power lines. The device's low offset drift ensures stable performance over temperature, which is critical for patient monitoring. Its hermetic TO-99 package provides reliability in medical equipment.
Recommended
Active Filters
The OP27AJ/883C is well-suited for active filters requiring high precision and low noise. With a gain-bandwidth product of 8 MHz, it can implement filters up to several hundred kHz. Its low offset voltage and drift ensure accurate DC performance in low-frequency filters. The device's high open-loop gain maintains filter accuracy. In a 4th-order low-pass filter for data acquisition, the OP27 provides the necessary performance without introducing significant noise or distortion.
Recommended
Data Acquisition Systems
In data acquisition systems, the OP27AJ/883C conditions analog signals before ADC conversion. Its low noise and high accuracy ensure that the digitized signal faithfully represents the original. The device's fast settling time (2.8 V/µs slew rate) supports high-speed sampling. Its wide supply range allows operation from ±15V rails common in DAQ systems. The military temperature range makes it suitable for aerospace data acquisition.
Recommended
Aerospace and Defense Electronics
The OP27AJ/883C is qualified to MIL-STD-883, making it suitable for aerospace and defense applications. Its hermetic TO-99 package protects against moisture and contaminants. The device operates over the full military temperature range (-55°C to +125°C), ensuring reliability in extreme environments. Applications include guidance systems, radar signal processing, and flight control electronics. The low noise and high precision are essential for accurate sensor measurements in these systems.
Recommended
Test and Measurement Equipment
The OP27AJ/883C is used in test and measurement equipment such as digital multimeters, oscilloscopes, and signal generators. Its high accuracy and low noise ensure precise measurements. The device's high open-loop gain and low offset voltage contribute to the overall accuracy of the instrument. In a precision voltage reference buffer, the OP27 provides a stable output with minimal error. Its wide bandwidth supports AC measurements up to several MHz.
Recommended
Recommended Products Summary
Engineering reference data for OP27AJ/883C — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OP27AJ/883 | OP27AJ/883B | OP27AZ | OPA27 |
|---|---|---|---|---|---|
| Package | TO-99-8 | TO-99-8 | TO-99-8 | TO-99-8 | TO-99-8 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Gain Bandwidth Product | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Slew Rate | 2.8 V/µs | 2.8 V/µs | 2.8 V/µs | 2.8 V/µs | 2.8 V/µs |
| Input Offset Voltage (max) | 25 µV | 25 µV | 25 µV | 25 µV | 25 µV |
| Input Voltage Noise Density | 3 nV/√Hz | 3 nV/√Hz | 3 nV/√Hz | 3 nV/√Hz | 3 nV/√Hz |
| Supply Voltage Range | ±4V to ±18V | ±4V to ±18V | ±4V to ±18V | ±4V to ±18V | ±4V to ±18V |
| Temperature Range | -55°C to +125°C | -55°C to +125°C | -55°C to +125°C | 0°C to +70°C | -55°C to +125°C |
Key Differentiators
- Military-grade 883C qualification (vs OP27AZ)
- Hermetic TO-99 package (vs OP27GJZ)
- Pin-compatible with OPA27 (vs OPA27)
Design Notes
The OP27AJ/883C operates from dual supplies of ±4V to ±18V. For optimal performance, use low-impedance power sources and bypass each supply pin with a 0.1 µF ceramic capacitor placed close to the device. Additionally, a 10 µF tantalum capacitor on each supply line can help filter low-frequency noise. Ensure the supply voltages are within the absolute maximum ratings to avoid damage.
For the TO-99-8 package, ensure proper lead forming and insertion to avoid mechanical stress. Use a socket if repeated removal is expected. On the PCB, provide adequate copper area for heat dissipation if operating at high supply voltages. Keep input traces short and shielded to minimize noise pickup. Ground the metal can if connected to the substrate for shielding.
The OP27AJ/883C has an input bias current of ±40 nA, which can cause offset errors in high-impedance circuits. Use balancing resistors equal to the parallel combination of source resistances to cancel bias current effects. Also, the device is not suitable for single-supply operation without proper level shifting. Avoid exceeding the common-mode input range, which is typically from V- + 2V to V+ - 2V.
Compliance Information
The OP27AJ/883C is a military-grade part and is not RoHS compliant due to lead in the hermetic package. It is not AEC-Q100 qualified as it is not intended for automotive use.
