Analog Devices Inc. LT1462CS8#PBF

Overview

LT1462CS8#PBF from Analog Devices (formerly Linear Technology) is a dual micropower JFET-input operational amplifier optimized for ultra-low input bias current (20pA max), 45µA supply current per amplifier, and unity-gain stability with capacitive loads up to 10nF. It features rail-to-rail input common-mode range including the positive supply, ±13.7V output swing into 10kΩ at ±15V, and is specified for operation from –40°C to 85°C in SO-8 package - ideal for photocurrent amplification and battery-powered sensor front-ends.

For engineers reviewing the LT1462CS8#PBF datasheet, LT1462CS8#PBF pinout, LT1462CS8#PBF application, or LT1462CS8#PBF equivalent, key selection criteria include picoampere-level input bias current, C-load drive capability, micropower consumption, guaranteed matching specs between amplifiers, and compatibility with ±5V/±15V supplies in space-constrained industrial and portable instrumentation designs.

Technical Context

The LT1462CS8#PBF employs JFET input stage architecture enabling sub-100pA input bias current across temperature and supply voltage ranges. Its internal compensation ensures stable unity-gain operation with up to 10nF capacitive load without external compensation components.

It delivers guaranteed matching specifications - including offset voltage match (≤3.0mV), bias current match (≤20pA), and CMRR/PSRR match - critical for dual-channel precision applications such as differential sensing and active filtering where channel-to-channel tracking matters.

Key Specifications

Pinout & Package

LT1462CS8#PBF is housed in an 8-lead plastic SO (SO-8, narrow 0.150") package with standard dual op amp pinout and JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1464CS8#PBF and OPA2140IDR, the LT1462CS8#PBF uniquely balances ultra-low input bias current, micropower operation, rail-inclusive input range, and guaranteed dual-channel matching - making it optimal for precision, low-speed, high-impedance dual-channel applications where supply current and input headroom are constrained.

Availability

LT1462CS8#PBF is available at Aetrix Electronics and suitable for photocurrent amplification, low-frequency active filtering, and battery-powered sensor front-ends requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for LT1462CS8#PBF 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 product support, manufacturing, and documentation for legacy Linear op amps including the LT1462 family.

The LT1462 product line was designed specifically for ultra-low-power, high-impedance analog signal conditioning in portable and remote instrumentation - emphasizing picoampere bias current, C-load stability, and dual-amplifier matching under micropower constraints.

FAQ

What is the maximum capacitive load the LT1462CS8#PBF can drive stably in unity-gain configuration?

The LT1462CS8#PBF is unity-gain stable with capacitive loads up to 10nF, as confirmed in the datasheet's "Phase Margin vs CLOAD" plot and typical application circuits. This eliminates the need for external isolation resistors when driving ADC input capacitors, long PCB traces, or coaxial cables - a key advantage over many general-purpose op amps that require compensation networks for loads >100pF. The LT1462CS8#PBF achieves this via internal compensation optimized for micropower JFET input stages.

Does the LT1462CS8#PBF support operation from ±5V supplies, and are all specifications guaranteed at that voltage?

Yes, the LT1462CS8#PBF is fully specified and guaranteed for operation with ±5V supplies, including input offset voltage (0.4–0.8mV max), input bias current (20pA max), supply current (43µA max), and output swing (±3.7V into 2kΩ). The datasheet provides separate electrical characteristics tables for ±5V and ±15V conditions, and all key parameters - including slew rate, gain bandwidth, and matching specs - are tested and guaranteed across both supply ranges. The LT1462CS8#PBF maintains rail-inclusive input common-mode range even at ±5V.

How does the LT1462CS8#PBF prevent phase reversal when input voltages exceed the common-mode range?

The LT1462CS8#PBF incorporates internal phase reversal protection circuitry that prevents output inversion when the input common-mode voltage exceeds the negative rail - a failure mode common in standard JFET-input op amps. As demonstrated in Figure 1 of the datasheet, while competing devices exhibit catastrophic phase reversal under ±5V supply with over-range sine inputs, the LT1462CS8#PBF maintains correct polarity and functionality. This makes the LT1462CS8#PBF reliable in servo loops and sensor interfaces where transient overvoltage events may occur.

Are the two amplifiers inside the LT1462CS8#PBF electrically isolated, and what matching specifications are guaranteed?

While the two amplifiers in the LT1462CS8#PBF share the same die and substrate, they are functionally independent with no intentional electrical coupling. The datasheet guarantees matching specifications including offset voltage match (≤3.0mV at ±15V), noninverting bias current match (≤20pA), common-mode rejection match (≥72dB), and power supply rejection match (≥74dB). These are measured differentially between the two amplifiers and validated across temperature and supply conditions - enabling precise dual-channel applications like differential amplification and matched filter banks where tracking matters.

What is the thermal performance of the LT1462CS8#PBF in SO-8 package, and how does it affect long-term reliability?

The LT1462CS8#PBF in SO-8 package has a junction-to-ambient thermal resistance (θ_JA) of 190°C/W, resulting in a maximum junction temperature rise of 85.5°C at full rated dissipation (45µA × 30V = 1.35mW per amplifier). With ambient temperatures up to 85°C, the junction remains well below the 150°C absolute maximum, ensuring robust long-term reliability. The SO-8 package also supports standard reflow profiles and offers moisture sensitivity level (MSL) 1 handling - critical for high-yield manufacturing of industrial and medical-grade equipment using the LT1462CS8#PBF.