LM310N

LM310N: Monolithic Operational Amplifier Technical Summary

Overview

The LM310N is a monolithic operational amplifier from the LM110 series, specifically designed as a unity-gain non-inverting amplifier. It incorporates super-gain transistors in the input stage to achieve low bias current while maintaining high-speed performance. The device is fully compatible with industry-standard operational amplifiers such as the 101, 741, and 709 in voltage follower applications. Internally frequency compensated, the LM310N simplifies circuit design by eliminating the need for external compensation components.

Features

• Low Input Current: Maximum of 10 nA over the entire operating temperature range, ensuring minimal loading on signal sources.
• High-Speed Performance: Small signal bandwidth of 20 MHz for wideband applications.
• Fast Slew Rate: 30 V/µs enables rapid response to input signal changes.
• Wide Supply Voltage Range: Operates from ±5V to ±18V, providing flexibility in various power supply configurations.
• Internal Frequency Compensation: Eliminates the need for external compensation components, simplifying circuit design.
• Direct Replacement: Pin-compatible with 101, 741, and 709 operational amplifiers in voltage follower applications.

Applications

The LM310N is suitable for a wide range of analog signal processing applications, including:

• Voltage followers and buffer amplifiers
• Active filters and signal conditioning circuits
• Data acquisition systems
• Test and measurement equipment
• Analog computing circuits
• Industrial control systems

Electrical Characteristics

The following table summarizes the key electrical specifications of the LM310N operational amplifier:

• Input Offset Voltage: 2 mV (typical)
• Input Bias Current: 7 nA (typical), 10 nA (maximum)
• Input Offset Current: 3 nA (typical)
• Common Mode Rejection Ratio (CMRR): 90 dB (typical)
• Power Supply Rejection Ratio (PSRR): 96 dB (typical)
• Large Signal Voltage Gain: 200 V/mV (typical) with RL ≥ 2kΩ
• Supply Current: 2.8 mA (typical)
• Output Voltage Swing: ±13 V (typical) with ±15 V supplies
• Input Resistance: 1.5 MΩ (typical)
• Output Resistance: 75 Ω (typical)

Absolute Maximum Ratings

Stresses beyond these ratings may cause permanent damage to the device:

• Supply Voltage: ±22 V
• Input Voltage: ±15 V
• Differential Input Voltage: ±30 V
• Output Short Circuit Duration: Continuous (with proper heat sinking)
• Operating Temperature Range: -55°C to +125°C (military grade available)
• Storage Temperature Range: -65°C to +150°C
• Junction Temperature: 150°C

Package Information

The LM310N is available in a standard 8-pin DIP (Dual In-line Package) with the following mechanical specifications:

• Package Type: PDIP-8
• Package Dimensions: 9.81 mm x 6.35 mm body
• Lead Pitch: 2.54 mm (0.1 inch)
• Lead Material: Copper alloy
• Lead Finish: Matte tin or solder-plated
• Mounting Style: Through-hole
• Weight: Approximately 1.2 grams

Thermal Characteristics

• Thermal Resistance, Junction-to-Ambient: 100°C/W (typical)
• Thermal Resistance, Junction-to-Case: 45°C/W (typical)

Design Considerations

When designing with the LM310N operational amplifier, consider the following guidelines:

• For optimal performance, use bypass capacitors (0.1 µF) close to the power supply pins
• The device is internally compensated for unity-gain stability, but additional compensation may be required for specific applications
• Maintain proper PCB layout techniques to minimize parasitic capacitance and inductance
• For high-frequency applications, consider the effects of package parasitics on performance
• When operating at high gains, pay attention to the amplifier's phase margin and stability

Reliability and Qualification

The LM310N meets or exceeds the following reliability standards:

• MIL-STD-883 compliant versions available for military/aerospace applications
• ESD protection: 2000V Human Body Model
• Manufactured under strict quality control procedures
• Burn-in and 100% electrical testing available for high-reliability applications

Ordering Information

The device is available in several variants:

• LM310N: Standard commercial grade, 0°C to +70°C
• LM310AN: Extended temperature range, -25°C to +85°C
• LM310M: Military grade, -55°C to +125°C (requires special ordering)
• Packaging options include tube, rail, and bulk packaging