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OP27GSZ-REEL7

Ultra-Low Noise Op Amp, 3nV/sqrtHz, +/-10uV Vos, 8MHz, SOIC-8

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Manufacturer Part：

OP27GSZ-REEL7

Package：

SOIC-8 (5.0 x 3.9 x 1.5 mm)

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Description

Product Overview

The OP27GSZ-REEL7 from Analog Devices is a ultra-low noise precision operational amplifier with 3 nV/sqrt(Hz) noise, +/-10 uV offset, and 8 MHz bandwidth in an SOIC-8 package.

Key Specifications

Type Ultra-Low Noise Precision Operational Amplifier
Supply Voltage +/-4 V to +/-18 V
Voltage Noise 3 nV/sqrt(Hz) @ 1kHz
Input Offset Voltage +/-10 uV (max, A grade)
Offset Drift 0.2 uV/C (max, A grade)
Gain Bandwidth Product 8 MHz
Slew Rate 2.8 V/us
CMRR 110 dB (min)
Open-Loop Gain 120 dB (min)
Supply Current 3.0 mA (typical)
Package SOIC-8
Operating Temperature -40C to +85C

Features

  • 3 nV/sqrt(Hz) voltage noise – industry-leading for bipolar op amps
  • +/-10 uV max offset voltage (A grade)
  • 0.2 uV/C max offset drift
  • 110 dB minimum CMRR
  • 120 dB minimum open-loop gain
  • Compensated for gains >= 5 (OP27)
  • Drop-in upgrade for OP07

Applications

  • Professional audio microphone preamplifiers
  • Precision instrumentation amplifiers
  • Low-noise data acquisition front-ends
  • High-resolution ADC input buffers

The OP27GSZ-REEL7 from Analog Devices is an ultra-low noise precision operational amplifier that has been an industry benchmark for low-noise signal processing since its introduction. The 3 nV/sqrt(Hz) voltage noise at 1 kHz remains competitive for bipolar input op amps, making it a standard choice for professional audio and precision instrumentation. The +/-10 uV max offset voltage (A grade) with 0.2 uV/C max drift ensures DC precision. The 110 dB minimum CMRR and 120 dB minimum open-loop gain enable accurate signal processing in demanding differential circuits. The OP27 is de-compensated for gains >= 5; for unity-gain applications, use the OP37. The device is a drop-in upgrade for the classic OP07 with improved noise and speed performance.

The OP27GSZ-REEL7 uses a super-beta bipolar input stage where the input transistors have approximately 5x the current gain of standard NPN transistors. This reduces the base current (and therefore input bias current) while maintaining the low voltage noise that only bipolar transistors can achieve. The 3 nV/sqrt(Hz) noise is achieved by operating the input pair at a relatively high collector current (approximately 500 uA per side), which increases the transconductance (gm) and reduces the equivalent input noise voltage. The input offset voltage is laser-trimmed at wafer level by selectively shorting segments of a collector resistor string to null the offset. The de-compensated architecture uses a smaller internal compensation capacitor than a unity-gain-stable design, providing the 8 MHz GBW and 2.8 V/us slew rate at the cost of requiring a minimum gain of 5 for stability. The output stage uses class AB push-pull with current limiting and thermal protection.

Pin Name Type Function
1 OFFSET NULL1 Input Offset trim
2 IN- Input Inverting input
3 IN+ Input Non-inverting input
4 VS- Power Negative supply
5 OFFSET NULL2 Input Offset trim
6 OUTPUT Output Amplifier output
7 VS+ Power Positive supply
8 NC – No connect
  • Professional condenser microphone preamp with 3nV noise floor
  • 16-bit ADC driver with gain >= 5 for strain gauge bridge
  • Precision instrumentation amplifier with 120dB open-loop gain
  • Low-noise RIAA phono preamplifier for vinyl record playback
Manufacturer Part Number Package Notes
ADI OP37GSZ-REEL7 SOIC-8 Unity-gain stable version (63 MHz GBW)
TI OPA227U SOIC-8 Similar, lower noise, de-compensated
ADI OP07DRZ-REEL7 SOIC-8 Predecessor, lower speed, unity stable
TI OPA211AIDR SOIC-8 1.1nV noise, 80MHz, modern alternative
ADI ADA4898-1ARZ SOIC-8 0.9nV noise, 1GHz GBW, modern upgrade
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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