Analog Devices Inc. LT1465CS

Overview

LT1465CS from Analog Devices (formerly Linear Technology) is a quad micropower JFET-input operational amplifier optimized for ultra-low input bias current (20 pA max), 1 MHz gain bandwidth, and unity-gain stability with capacitive loads up to 10 nF. It operates from ±5 V or ±15 V supplies, delivers ±13.7 V output swing into 10 kΩ, and targets precision photocurrent amplification, low-droop track-and-hold, and micropower active filtering.

For engineers reviewing the LT1465CS datasheet, LT1465CS pinout, LT1465CS application, or LT1465CS equivalent, key selection criteria include verified picoampere-level input bias current over temperature, guaranteed matching specs across all four amplifiers, C-load stability without external compensation, rail-to-rail input common-mode range (including positive rail), and SO-14 package compatibility with high-impedance sensor interfaces.

Technical Context

The LT1465CS uses matched JFET input pairs to achieve 20 pA maximum input bias current at 25°C and 2.5 nA at 85°C, with input offset voltage drift of only 7 µV/°C. Its architecture supports full rail-to-rail common-mode input range (–12.5 V to +15 V on ±15 V supplies) and eliminates phase reversal when inputs exceed negative rail-critical in ±5 V systems with wide-swing sensors.

Each amplifier delivers 0.9 V/µs slew rate and 1 MHz typical gain bandwidth product while consuming just 200 µA per channel. The device is fully characterized for matching parameters (e.g., ∆VOS ≤ 4 mV, ∆IB⁺ ≤ 800 pA) between amplifier pairs A/D and B/C, enabling precise differential and multi-stage analog signal conditioning.

Key Specifications

Pinout & Package

LT1465CS is housed in a 14-lead plastic SO (SO-14) surface-mount package with standard quad op amp pinout and 1.27 mm lead pitch. Thermal resistance θ_JA = 150°C/W enables operation at full rated current without forced airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad JFET-input op amp applications.

Compared with LT1465CN and LT1462CS, the LT1465CS uniquely balances quad-channel integration, 1 MHz bandwidth, picoampere bias current, and SO-14 manufacturability-making it the only option supporting high-precision, high-density, and production-ready designs simultaneously.

Availability

LT1465CS is available at Aetrix Electronics and suitable for battery-powered instrumentation, precision sensor signal chains, and low-drift analog data acquisition systems requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for LT1465CS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Linear Technology in 2017 and maintains full production and technical support for legacy Linear op amps. Linear pioneered high-precision, low-power analog ICs for demanding industrial and medical applications.

The LT1465CS belongs to Linear's C-Load™ op amp family, designed specifically for interfacing with high-impedance sources and capacitive loads in portable, precision, and zero-maintenance analog systems.

FAQ

What is the maximum input bias current specification for LT1465CS over temperature?

The LT1465CS guarantees ≤20 pA maximum input bias current at 25°C. At –40°C to 85°C, the datasheet specifies up to 2.5 nA under worst-case conditions. This remains among the lowest published IB for quad op amps in SO-14 packages, enabling reliable operation with >1 GΩ source impedances across industrial temperature ranges. The LT1465CS achieves this via matched JFET input stages and proprietary process trimming.

Does LT1465CS require external compensation for stability with capacitive loads?

No, the LT1465CS is explicitly designed as a C-Load™ op amp and is unity-gain stable driving up to 10 nF directly at its output. Unlike conventional op amps that oscillate or ring with >100 pF loads, the LT1465CS maintains ≥66° phase margin even with 10 nF, eliminating the need for series isolation resistors or complex compensation networks in photodiode transimpedance or track-and-hold applications.

How are matching specifications defined for LT1465CS amplifier pairs?

Matching specs for the LT1465CS are defined per datasheet Note 7: offset voltage match (∆VOS), noninverting bias current match (∆IB⁺), CMRR match (∆CMRR), and PSRR match (∆PSRR) are measured between amplifiers A and D, and between B and C. For example, ∆VOS ≤ 4 mV means the absolute difference between Amp A and Amp D offset voltages is ≤4 mV - critical for precision differential stages and chopper-stabilized architectures using LT1465CS.

Can LT1465CS operate from a single +5 V supply?

The LT1465CS is specified for dual ±5 V and ±15 V operation only. It does not support true single-supply operation because its input common-mode range extends to V+ but not to V–, and output swing is asymmetric below V–. For single +5 V systems, consider rail-to-rail input/output op amps like AD8604 or LTC2050 - the LT1465CS requires both positive and negative rails to meet its guaranteed specifications.

What is the thermal resistance (θ_JA) of the LT1465CS SO-14 package?

The LT1465CS in the 14-lead plastic SO package has a junction-to-ambient thermal resistance (θ_JA) of 150°C/W, as documented in the "PACKAGE/ORDER INFORMATION" section of the datasheet. This value assumes standard JEDEC 2-layer board conditions. With 800 µA total supply current (4 × 200 µA), power dissipation is ~12 mW, resulting in <2°C junction-to-ambient rise - well within safe operating limits for continuous operation.