LT1055CH - 6.5MHz Precision JFET Op Amp | Analog Devices
MPN: LT1055CH ✓ ActiveLT1055CH Overview
A JFET-input operational amplifier is a voltage-feedback amplifier whose input stage uses junction field-effect transistors. This amplifier class provides very high input impedance, low input bias current, and low input-current noise while preserving accurate DC behavior. In the broader semiconductor hierarchy, the LT1055CH belongs to the operational-amplifier family within analog ICs and instrumentation amplification, where it is used to amplify low-level signals without loading the source.
The LT1055 family combines several key performance features. Its maximum offset voltage is 150 µV, its typical offset drift is 1.2 µV/°C, and the verified specifications list guaranteed maximum drift as high as 4 µV/°C depending on temperature grade and conditions. Typical input bias current is 40 pA at 70°C and 500 pA at 125°C. These characteristics make the device suitable for precision current-to-voltage conversion, instrumentation, data acquisition, and feedback networks requiring low input current.
With a 6.5 MHz gain-bandwidth product and 16 V/µs slew rate, the LT1055CH responds quickly enough for video, communications, active filtering, and pulse-processing circuits. Its JFET input stage avoids the substantially higher bias current commonly associated with bipolar input amplifiers, helping preserve accuracy in high-impedance sources. Precise common-mode, supply, noise, and input-current limits must still be selected from the manufacturer datasheet for the final design.
Typical applications include precision transimpedance stages, low-leakage sensor interfaces, high-impedance buffer amplifiers, active analog filters, and communication-signal conditioning. In a transimpedance amplifier, the low bias current reduces current-error and settling effects. In an active filter, the combination of precision offset and 6.5 MHz bandwidth supports accurate signal processing over a useful frequency range.
The primary design consideration is to preserve the LT1055CH's low-noise and low-offset benefits without overdriving the input or output stage. Designers should verify supply voltage, common-mode range, output swing, stability, and compensation requirements against the manufacturer datasheet before finalizing the circuit. PCB layout should keep sensitive input nodes short and provide adequate bypassing close to the supply pins.
This page consolidates verified manufacturer specifications, distributor availability information, packaging details, source links, and engineering selection guidance. It distinguishes published LT1055/LT1056 family information from values that were not supplied by the verified sources, avoiding unsupported replacement or pricing claims.
Drop-in alternatives for LT1055CH — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesLT1055CH Maximum Ratings & Electrical Characteristics
| Amplifier Type | Precision JFET-input operational amplifier |
| Number of Circuits | 1 circuit |
| Gain-Bandwidth Product | 6.5 MHz |
| Slew Rate | 16 V/µs |
| Typical Offset Voltage | 50 µV |
| Maximum Offset Voltage | 150 µV |
| Typical Offset Voltage Drift | 1.2 µV/°C |
| Guaranteed Maximum Offset Voltage Drift | 4 µV/°C |
| Typical Input Bias Current at 70°C | 40 pA |
| Typical Input Bias Current at 125°C | 500 pA |
| Guaranteed Maximum Input Bias Current at 70°C | 150 pA |
| Guaranteed Maximum Input Bias Current at 125°C | 2.5 nA |
| Input Offset Voltage at 125°C | 500 µV maximum |
| Package | TO-5 metal can |
| Terminal Count | 8 terminals |
| RoHS Status | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
LT1055CH to-5 metal can Pin Configuration Guide
Pin configuration for LT1055CH (to-5 metal can package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for LT1055CH.
Refer to the datasheet for full pin configuration.
Typical Applications
LT1055CH is suitable for 6 applications: Precision Transimpedance Amplification, High-Impedance Sensor Signal Conditioning, Precision Active Analog Filtering, Communications Signal Conditioning, Video and Pulse Signal Amplification, Low-Leakage Measurement and Feedback Circuits.
Precision Transimpedance Amplification
The LT1055CH fits transimpedance stages for photodiodes, photoconductors, and other current-output sensors because its JFET input bias current is typically 40 pA at 70°C and no more than 150 pA under the guaranteed condition stated by the manufacturer. Low bias current limits the error introduced across the feedback resistor. The 6.5 MHz gain-bandwidth product and 16 V/µs slew rate provide useful response speed, although the feedback resistor, compensation capacitor, sensor capacitance, and stability must be evaluated together.
High-Impedance Sensor Signal Conditioning
The LT1055CH is appropriate for conditioning high-impedance sensor outputs where amplifier input current could corrupt a small signal. Its typical input bias current of 40 pA at 70°C is much lower than a conventional bipolar-input amplifier, while the 150 µV maximum offset specification supports accurate DC-coupled measurements. The 16 V/µs slew rate helps preserve large-scale transient response. Designers should still verify input capacitance, common-mode range, electrostatic protection, and sensor leakage against the manufacturer specifications.
Precision Active Analog Filtering
The LT1055CH can serve as an active filter element where low offset and reasonable bandwidth are both important. Its 6.5 MHz gain-bandwidth product provides a substantial operating range for low-frequency precision sections and moderate-bandwidth communication filters, while 150 µV maximum offset limits DC error. The 16 V/µs slew rate improves large-signal behavior compared with slower precision amplifiers. Stability must be checked for each closed-loop gain, and output swing and noise gain must remain inside the datasheet limits.
Communications Signal Conditioning
The LT1055CH is suitable for communications signal-conditioning blocks that require low input bias current, accurate DC behavior, and higher slew rate than a general-purpose slow amplifier. The 6.5 MHz gain-bandwidth product supports moderate-frequency amplification, and 16 V/µs slew rate reduces large-signal distortion potential. The JFET input stage can avoid loading a high-impedance driver or attenuator. Supply voltage, input and output ranges, channel isolation, and gain stability should be confirmed from the manufacturer datasheet.
Video and Pulse Signal Amplification
The LT1055CH can amplify video or pulse signals when the source is high impedance and the circuit needs more bandwidth and slew rate than a precision-only amplifier provides. Its 6.5 MHz gain-bandwidth product and 16 V/µs slew rate allow the device to follow rapidly changing waveforms while retaining a maximum offset of 150 µV. The actual usable bandwidth depends on closed-loop gain and feedback topology. Output drive, settling behavior, stability, and load capacitance must be checked before selecting a particular compensation approach.
Low-Leakage Measurement and Feedback Circuits
The LT1055CH fits precision measurement and feedback circuits where input bias current can become the dominant error source. The family specification lists 40 pA typical input bias current at 70°C, 500 pA typical at 125°C, and guaranteed maxima of 150 pA and 2.5 nA at those respective temperatures. Its 150 µV maximum offset and 6.5 MHz bandwidth support accurate closed-loop behavior. Board cleanliness, guard rings, contamination, and temperature gradients remain important because practical leakage can exceed the device's specified input current.
Engineering reference data for LT1055CH — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Amplifier Type | Precision JFET-input operational amplifier |
| Number of Circuits | 1 circuit |
| Gain-Bandwidth Product | 6.5 MHz |
| Slew Rate | 16 V/µs |
| Maximum Offset Voltage | 150 µV |
| Typical Offset Voltage | 50 µV |
| Typical Input Bias Current at 70°C | 40 pA |
| Guaranteed Maximum Input Bias Current at 125°C | 2.5 nA |
| Package | 8-lead TO-5 metal can |
| Brand | Analog Devices |
Key Differentiators
- Precision offset with very low JFET bias current (vs General-purpose bipolar-input operational amplifier)
- Speed and precision are available together (vs Slow precision operational amplifier)
- Temperature-dependent bias current remains specified (vs Unverified generic JFET amplifier)
Design Notes
Keep the LT1055CH input and feedback traces short and minimize parasitic capacitance around sensitive nodes. Place input and output decoupling capacitors close to their corresponding pins and provide a low-impedance ground return. Because the part is specified as a JFET input device with very low bias current, keep board contamination, flux residue, moisture, and unintended leakage paths away from the input pins. Guard structures can help when the source impedance is exceptionally high.
Do not treat low bias current as permission to ignore common-mode range, output swing, supply limits, or stability. The verified excerpts do not include the complete electrical limits, so the manufacturer datasheet must be checked for every operating condition. Also avoid inferring a valid pinout from the eight-terminal package count alone. Use the official TO-5 drawing and connection diagram to identify offset-null, supply, input, and output leads before assembling or redesigning the PCB.
For transimpedance and active-filter circuits, evaluate the complete feedback network rather than choosing resistor and capacitor values from gain-bandwidth product alone. Account for source capacitance, op-amp input capacitance, feedback-capacitor parasitics, noise gain, and the target phase margin. The published 6.5 MHz gain-bandwidth product and 16 V/µs slew rate are useful starting points, but they do not by themselves guarantee stability for every closed-loop gain or load condition.
Estimate power dissipation from the actual supply voltage, output voltage, and output-current conditions using the difference between input and output voltage multiplied by output current. Compare that estimate with the maximum power rating and the thermal limits specified for the TO-5 package. The verified excerpts do not provide operating temperature, thermal resistance, or maximum supply voltage, so no numerical thermal conclusion can be made without consulting the manufacturer datasheet.
Compliance Information
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not applicable because the LT1055CH is an industrial/commercial precision operational amplifier rather than an automotive-qualified device.
