LT1465CN - 4-Channel Micropower JFET Op Amp | Analog Devices
N.º de pieza: LT1465CN ✓ ActivoLT1465CN Descripción general
An operational amplifier is an analog integrated circuit that amplifies the difference between two input voltages while providing high input impedance, low output impedance, and controlled gain. The LT1465 belongs to the micropower JFET-input operational amplifier category, combining low supply current with very low input bias current. This combination is useful when the signal source has extremely high source resistance or when leakage current would otherwise disturb the measurement.
Key features include a 1 MHz gain-bandwidth product, operation from a single or dual supply, and output swing capability that allows a 10 kOhm load to be driven to within 1.5 V of either supply rail. The JFET input stage provides picoampere-level bias current, while the micropower architecture limits supply consumption. The 14-pin PDIP package supports through-hole PCB assembly and conventional socket or leaded-board layouts.
The LT1465CN is intended for applications requiring very low input bias current without the higher supply current associated with conventional bipolar input stages. Its unity-gain stability permits direct operation around buffers and voltage followers with capacitive loads up to 10 nF. The 1 MHz gain-bandwidth product is suitable for slow signal-conditioning paths, sensor interfaces, and precision control loops rather than high-speed video or communications channels.
Typical applications include pH and chemical-sensor front ends, biomedical instrumentation, photodiode amplifiers, capacitive transducers, low-level current-to-voltage converters, and battery-powered measurement systems. In these applications, the amplifier can sit directly at the sensor output, where the low 500 fA typical bias current helps preserve the integrity of high-impedance signals and reduces the need for unusually low-leakage surrounding components.
A key design consideration is power-supply headroom. Output swing is specified to within 1.5 V of either supply when driving a 10 kOhm load, so the supply voltage must remain above the desired output range by the required headroom. Decoupling should be placed close to the supply pins, and the input and output networks should be checked for leakage, bootstrapping, and capacitive-load stability at the actual board level.
This page combines the manufacturer product information, distributor listings, package details, and cross-reference findings for LT1465CN. The most important practical distinction is the combination of quad-channel integration, micropower operation, picoampere-class input bias, and a 14-pin PDIP footprint; applications that require a surface-mount package or substantially higher bandwidth need a different device family.
Alternativas directas para LT1465CN — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
LT1465CN#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT1465CN Valores máximos y características eléctricas
| Number of Amplifier Circuits | 4 circuits |
| Amplifier Type | JFET-input operational amplifier |
| Supply Current per Amplifier | 200 uA maximum |
| Input Bias Current | 500 fA typical |
| Gain-Bandwidth Product | 1 MHz |
| Unity-Gain Stability | Stable with capacitive loads up to 10 nF |
| Output Swing | Within 1.5 V of either supply with a 10 kOhm load |
| Encapsulado | 14-pin PDIP, 0.300 inch pitch, 7.62 mm |
| Estilo de montaje | Through-hole |
| Slew Rate | 0.9 V/us |
Guía de configuración de pines de LT1465CN 14-pin pdip, 0.300 inch pitch, 7.62 mm
Configuración de pines para LT1465CN (encapsulado 14-pin pdip, 0.300 inch pitch, 7.62 mm). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para LT1465CN.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LT1465CN es adecuado para 6 aplicacións: High-Impedance Sensor Signal Conditioning, Photodiode and Optical Detector Amplification, Battery-Powered Instrumentation, Precision Current-to-Voltage Conversion, Capacitive Transducer Readout, Low-Power Analog Signal Conditioning.
High-Impedance Sensor Signal Conditioning
The LT1465CN is appropriate for pH electrodes, ion-selective sensors, capacitive probes, and other high-source-impedance sensors because its JFET input stage has a typical input bias current of 500 fA. Place the amplifier near the sensor to minimize leakage from moisture, connectors, and PCB contamination. The 1 MHz gain-bandwidth product is sufficient for slow measurement signals, while the 200 uA maximum supply current per amplifier supports low-power instruments. Output headroom must remain above the 1.5 V swing limit when driving a 10 kOhm load.
Recomendado
Photodiode and Optical Detector Amplification
The LT1465CN can amplify small photodiode currents where input bias and leakage determine the useful signal floor. Its 500 fA typical bias current is much smaller than the leakage expected from many conventional input stages, helping preserve weak detector outputs. The four independent channels can support multiple optical channels or provide buffering around sensing elements. Unity-gain stability with loads up to 10 nF also suits cable and probe capacitance, although the 1 MHz bandwidth should be matched to the optical signal bandwidth rather than treated as a high-speed transimpedance specification.
Recomendado
Battery-Powered Instrumentation
The LT1465CN suits portable and battery-powered measurement equipment where four analog channels are needed without imposing a large supply-current burden. Each amplifier is specified for 200 uA maximum supply current, making the device suitable for low-duty-cycle acquisition, environmental monitoring, and field-test instruments. The JFET inputs reduce loading of high-impedance sensors, while the quad package conservates board area. Designers should still account for load current, reference circuitry, sensor power, and regulator efficiency when estimating the complete battery life.
Recomendado
Precision Current-to-Voltage Conversion
The LT1465CN can form the input stage of a precision transimpedance amplifier for photodiodes, electrochemical sensors, and leakage measurements. Its 500 fA typical input bias current places a low limit on the bias-related error when high-value feedback resistors are used. Unity-gain stability and operation with capacitive loads up to 10 nF help accommodate sensor and wiring capacitance. The practical limits are the 1 MHz gain-bandwidth product, input offset voltage, feedback-resistor tolerance, leakage, and PCB cleanliness; verify each value in the electrical-characteristics table.
Recomendado
Capacitive Transducer Readout
The LT1465CN is useful for capacitive transducers because its JFET input stage minimizes bias current into the sensing node and its unity-gain stability supports loads up to 10 nF. The four-channel configuration can read multiple capacitive elements, touch inputs, or strain and pressure elements sharing a common conditioning architecture. Keep sensitive nodes guarded and away from humid or contaminated board regions, since even small surface leakage can become significant with high source impedance. Use the manufacturer’s recommended feedback and compensation arrangements when the combined sensor and trace capacitance exceeds the stated range.
Recomendado
Low-Power Analog Signal Conditioning
The LT1465CN provides four channels of general-purpose precision conditioning for slow sensor outputs, buffer amplifiers, and low-level analog interfaces. Its 200 uA maximum supply current per amplifier reduces the impact of four active channels on portable-system power budgets, while 500 fA typical input bias current protects high-impedance sources. The 1 MHz gain-bandwidth product is appropriate for temperature, pressure, level, and chemical measurements rather than high-speed signal paths. Confirm supply range, offset, noise, common-mode limits, and output swing in the manufacturer datasheet.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LT1465CN — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LT1465CN#PBF |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | 14-PDIP (0.300", 7.62 mm) | 14-PDIP (0.300", 7.62 mm) |
| Number of Amplifier Circuits | 4 circuits | 4 circuits |
| Amplifier Type | JFET-input operational amplifier | JFET-input operational amplifier |
| Supply Current per Amplifier | 200 uA maximum | 200 uA maximum |
| Input Bias Current | 500 fA typical | 500 fA typical |
| Gain-Bandwidth Product | 1 MHz | 1 MHz |
| Capacitive Load Stability | Unity-gain stable up to 10 nF | Unity-gain stable up to 10 nF |
| Slew Rate | 0.9 V/us | 0.9 V/us |
| Mounting Style | Through-hole | Through-hole |
Diferenciadores clave
- Very low input bias in a four-channel micropower device (frente a LT1465CN#PBF)
- Direct capacitive-load operation (frente a LT1465CN#PBF)
- Low-power quad integration (frente a LT1465CN#PBF)
Notas de diseño
Place the LT1465CN close to the high-impedance source and route the sensitive input as a short, guarded trace. The JFET input stage has a 500 fA typical bias current, so board contamination, humidity, connector leakage, and flux residue can become important even though the amplifier itself draws very little current. Keep the feedback resistor and guard geometry away from switching nodes and high-impedance supply rails. Use a protective ground or driven guard where the circuit topology permits it.
Design the supply around both the amplifier current and the required output headroom. The LT1465CN is specified for 200 uA maximum supply current per amplifier, but the output can swing only to within 1.5 V of either supply when driving a 10 kOhm load. Do not select rail values solely from nominal signal amplitude. Confirm the permitted supply range, quiescent-current behavior across temperature, and the load-dependent output limits in the manufacturer datasheet before finalizing the power architecture.
Do not treat the 10 nF capacitive-load figure as permission for arbitrary loading. The LT1465CN is unity-gain stable with capacitive loads up to 10 nF, but long sensor cables, probe capacitance, output protection networks, and oscilloscope inputs add parasitics. Start with the manufacturer’s recommended stability network and verify the assembled circuit with a step response. If additional capacitance is unavoidable, add an appropriate isolation resistor and check gain-bandwidth and phase margin.
Información de cumplimiento
Exact-MPN compliance declarations are not stated in the verified product snippets. LT1465CN#PBF is identified as a lead-free ordering variant, but its full compliance status was not established from an explicit manufacturer declaration.
