LF442CN Dual Low Power JFET Input Operational Amplifiers DIP-8
The LF442CN is a dual low-power operational amplifier built with JFET input stages to deliver very high input impedance and low input currents. Housed in an 8-pin DIP (and also available in SOIC), it is tailored for designs where battery life and minimal loading of sensor sources matter. The architecture emphasizes clean linearity and stable operation across the commercial temperature range, enabling predictable analog performance in mixed-signal systems.
Internally the amplifiers use matched JFET input transistors and precision biasing to reduce offset and drift while preserving wide dynamic range. That topology yields a modest gain-bandwidth product and an improved slew response compared with legacy low-power op amps, helping at moderate frequencies without large power penalties. The device’s noise characteristics and extremely high input resistance are optimized for high-impedance signal chains.
Practical in single- or dual-supply environments, the LF442CN supports generous output swing and includes output short-circuit protection to guard outputs. External offset nulling is available on related family members, and the device is specified with conservative limits so designers can predict worst-case behavior when optimizing low-power analog front ends. Datasheet values aid component selection and thermal considerations during design.
Features:
- Low supply current: 200 µA per amplifier.
- Very low input bias current: ~5.0 pA.
- High gain-bandwidth product: 2.0 MHz.
- High slew rate: 6.0 V/µs.
- Very high input impedance: ~10^12 Ω.
- Large output voltage swing (near ±14 V with ±15 V supplies).
- Output short-circuit protection.
Specifications:
| Specification | Value (from LF442CN PDF) |
|---|---|
| Supply Voltage (VS): | Up to 36 V (±18 V) |
| Operating Temperature: | 0°C to +70°C |
| Input Offset Voltage: | 3 mV, Max 5 mV |
| Input Bias Current: | 3 pA, Max 100 pA |
| Input Offset Current: | 0.5 pA, Max 50 pA |
| Input Resistance: | 10¹² Ω |
| Common-Mode Input Voltage Range: | −11 V to +14.5 V |
| Large-Signal Voltage Gain: | 25 to 60 V/mV |
| Gain-Bandwidth Product: | 2 MHz |
| Slew Rate: | 6 V/µs |
| Output Voltage Swing: | Up to ±14 V (with ±15 V supply) |
| Power Supply Current: | 400 µA, 500 µA max |
| Common-Mode Rejection Ratio: | 86 dB |
| Power Supply Rejection Ratio: | 84 dB |
| Input Voltage Range: | ±15 V |
Pin Connections:
Applications:
- Battery-Powered Instrumentation.
- Portable Data Acquisition Systems.
- Multichannel Signal Conditioning.
- Active Filters (Low Frequency).
- Sample and Hold Circuits.
- Photodiode Preamplifiers.
- Piezoelectric Transducer Amplifiers.
- High Impedance Buffer Amplifiers.
- Low-Drift Integrators.
- Logarithmic Amplifiers.
- Peak Detectors.
- Medical Monitoring Equipment (Portable).
- Remote Sensor Amplifiers.
- Low-Noise Audio Preamplifiers (Battery Powered).
- Voltage Followers with High Input Impedance.
Package Contents:
- 1x LF442CN Dual Low Power JFET Input Operational Amplifiers DIP-8
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