TL074

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TL074 Quad Low-Noise JFET-Input Operational Amplifier

Overview

The TL074 is a high-performance, quad JFET-input operational amplifier from the TL07x series. This device combines the benefits of JFET technology (high input impedance) with bipolar output stages on a single monolithic chip. The TL074 is part of a family that includes single (TL071), dual (TL072), and quad (TL074) versions, with the quad version offering four independent op-amps in a single package.

The TL074 is particularly noted for its low harmonic distortion and low noise characteristics, making it exceptionally well-suited for high-fidelity audio applications and precision analog circuits. The device operates across a wide temperature range with different versions available for commercial, industrial, and military applications.

Key Features

• JFET-input stage provides very high input impedance (typically 10¹²Ω)
• Low input bias current: 30 pA (typical)
• Low input noise voltage: 18 nV/√Hz (typical)
• Low total harmonic distortion: 0.003% (typical)
• High slew rate: 13 V/µs (typical)
• Wide common-mode and differential voltage ranges
• Output short-circuit protection
• Latch-up free operation
• Available in multiple temperature ranges:
  • TL074C: 0°C to 70°C (Commercial)
  • TL074I: -40°C to 85°C (Industrial)
  • TL074M: -55°C to 125°C (Military)

Applications

The TL074's combination of features makes it ideal for a wide range of analog signal processing applications:

• High-fidelity audio preamplifiers and mixers
• Active filters (low-pass, high-pass, band-pass)
• Instrumentation amplifiers
• Sample-and-hold circuits
• Analog-to-digital converter interfaces
• Medical instrumentation
• Test and measurement equipment
• Industrial control systems
• Communications systems

Electrical Characteristics

All specifications are typical at V_CC = ±15V, T_A = 25°C unless otherwise noted.

DC Characteristics

• Input Offset Voltage: 3 mV (max)
• Input Offset Current: 5 pA (max)
• Input Bias Current: 30 pA (typical)
• Input Resistance: 10¹² Ω (typical)
• Large Signal Voltage Gain: 200 V/mV (min)
• Supply Current (per amplifier): 1.4 mA (typical)
• Common Mode Rejection Ratio: 100 dB (typical)

AC Characteristics

• Slew Rate: 13 V/µs (typical)
• Gain Bandwidth Product: 3 MHz (typical)
• Input Noise Voltage: 18 nV/√Hz at 1 kHz
• Input Noise Current: 0.01 pA/√Hz at 1 kHz
• Total Harmonic Distortion: 0.003% (typical at 1 kHz)

Absolute Maximum Ratings

• Supply Voltage: ±18 V
• Input Voltage: ±15 V
• Differential Input Voltage: ±30 V
• Output Short-Circuit Duration: Continuous
• Operating Temperature Range: See suffix options
• Storage Temperature Range: -65°C to +150°C

Package Information

The TL074 is available in several industry-standard packages:

14-Pin PDIP (Plastic Dual In-Line Package)

• Package Code: D
• Dimensions: 19.30 mm × 6.35 mm
• Pin Pitch: 2.54 mm
• Mounting: Through-hole

14-Pin SOIC (Small Outline Integrated Circuit)

• Package Code: D
• Dimensions: 8.65 mm × 3.91 mm
• Pin Pitch: 1.27 mm
• Mounting: Surface mount

14-Pin TSSOP (Thin Shrink Small Outline Package)

• Package Code: PW
• Dimensions: 5.00 mm × 4.40 mm
• Pin Pitch: 0.65 mm
• Mounting: Surface mount

Design Considerations

When designing with the TL074, consider the following:

• For best noise performance, keep source impedances low and use proper grounding techniques
• The high input impedance makes the device sensitive to leakage currents - maintain clean PCB surfaces
• Bypass power supplies with 0.1 µF ceramic capacitors close to the device pins
• For audio applications, maintain signal levels well below clipping for lowest distortion
• The output stage can typically drive 2 kΩ loads to ±10V

Comparison with Similar Devices

The TL074 compares favorably with other JFET-input op-amps:

• Compared to the TL084: Lower noise and distortion, but slightly higher power consumption
• Compared to the LF347: Similar performance, but TL074 has better noise specifications
• Compared to bipolar-input op-amps: Much higher input impedance, lower bias current, but generally lower GBW

Conclusion

The TL074 quad JFET-input operational amplifier offers an excellent combination of high input impedance, low noise, and low distortion performance in a versatile quad package. Its robust design and wide operating temperature ranges make it suitable for demanding applications across commercial, industrial, and military environments. The device's electrical characteristics and package options provide designers with flexibility in implementing high-performance analog circuits.

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