Analog Devices Inc. LT1361CN8#PBF

Overview

LT1361CN8#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed voltage-feedback operational amplifier with 50MHz gain bandwidth, 800V/µs slew rate, and ±15V supply capability. It delivers ±13V output swing into 500Ω at ±15V supplies and maintains stability with any capacitive load-making it ideal for video line drivers, active filters, and data acquisition front-ends requiring fast settling and low distortion.

For engineers reviewing the LT1361CN8#PBF datasheet, LT1361CN8#PBF pinout, LT1361CN8#PBF application, or LT1361CN8#PBF equivalent, key selection criteria include guaranteed 0.1% settling in 60ns, differential gain/phase of 0.2%/0.3° at 3.58MHz, unity-gain stability, and operation across ±2.5V to ±15V supplies with ≤5mA per amplifier supply current.

Technical Context

The LT1361CN8#PBF employs a proprietary voltage-feedback topology with matched high-impedance inputs and current-feedback-like slewing behavior. Its single-stage design enables excellent transient response, including 60ns 0.1% settling for a 10V step and <3.1ns rise time under ±15V supplies.

It features internal compensation that ensures unconditional stability with all capacitive loads-a critical advantage for cable driving and buffer applications. Input stage uses complementary NPN/PNP emitter followers for bias current cancellation, yielding low input offset current (≤250nA) and input bias current (≤1µA) over ±2.5V to ±15V supply range.

Key Specifications

Pinout & Package

LT1361CN8#PBF is housed in an 8-lead PDIP (N8) package with 0.300-inch width, RoHS-compliant lead finish, and through-hole mounting. Thermal resistance θ_JA = 130°C/W enables operation up to +85°C ambient with moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-speed op amp applications.

Compared with LT1361CS8#PBF, the LT1361CN8#PBF offers lower thermal resistance (130 vs 190°C/W) for through-hole reliability in high-ambient environments; versus LT1364CN8#PBF, it trades 20MHz bandwidth and 200V/µs slew for 1.3mA lower supply current and 0.5mV lower input offset-favoring precision over raw speed.

Availability

LT1361CN8#PBF is available at Aetrix Electronics and suitable for video line driving, active filtering, and instrumentation amplifier applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LT1361CN8#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 parts including the LT1361 series.

The LT1361 family was designed as dual high-speed, low-power op amps targeting video, data acquisition, and precision analog signal processing where unity-gain stability and capacitive load drive are mandatory.

FAQ

What is the maximum capacitive load the LT1361CN8#PBF can drive while remaining stable?

The LT1361CN8#PBF is unconditionally stable with any capacitive load-from 0pF up to at least 10,000pF-as confirmed by transient response testing and frequency-domain analysis in the official datasheet. This eliminates the need for external isolation resistors in coaxial cable driving applications, though a 75Ω series resistor is recommended for optimal pulse fidelity on 75Ω lines.

Does the LT1361CN8#PBF support single-supply operation?

The LT1361CN8#PBF is specified for dual-supply operation from ±2.5V to ±15V and does not support true single-supply use. Its input common-mode range extends to within ~1.1V of V– and ~1.7V of V+ at ±5V supplies, but rail-to-rail input or output is not supported. For single-supply applications, consider the LT1813 or LTC6228 families instead.

What is the typical power dissipation of the LT1361CN8#PBF at ±15V supplies?

At ±15V supplies and room temperature, the LT1361CN8#PBF draws ≤5mA per amplifier (10mA total), resulting in quiescent power dissipation of ≤150mW. Under worst-case conditions-full output swing into 500Ω-the dissipation increases to ~220mW. With θ_JA = 130°C/W, this yields a junction temperature rise of ≤28.6°C above ambient.

Can the LT1361CN8#PBF be used in a comparator configuration?

No-the LT1361CN8#PBF is not designed for open-loop comparator use. Sustained large differential input voltages cause excessive supply current and risk thermal damage. The datasheet explicitly warns against using it as a comparator, peak detector, or other open-loop application. For comparator functions, select dedicated devices such as the LT1016 or LTC6702.

How does the LT1361CN8#PBF achieve its high slew rate while maintaining low input bias current?

The LT1361CN8#PBF achieves this through a unique input stage combining complementary NPN and PNP emitter followers, which provide first-order bias current cancellation. This architecture delivers low input bias current (≤1µA) while enabling high slew rate (800V/µs) via a high-current gain node charged directly by the input differential voltage divided by a 500Ω internal resistor.