Analog Devices Inc. LT1801IMS8

Overview

LT1801IMS8 from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail input and output precision operational amplifier in an 8-lead MSOP package. It delivers 80MHz gain bandwidth, 25V/µs slew rate, and <350µV max input offset voltage at ±5V/3V supplies, operating from 2.3V to 12.6V total supply. It is used in high-fidelity signal conditioning paths where wide dynamic range and low distortion are required - such as driving SAR ADC inputs or buffering video line signals.

For engineers reviewing the LT1801IMS8 datasheet, LT1801IMS8 pinout, LT1801IMS8 application, or LT1801IMS8 equivalent, this page provides verified electrical specifications, MSOP package terminal mapping, real-world application contexts for rail-to-rail op amps, and two validated alternative parts with documented functional and parametric differences.

Technical Context

The LT1801IMS8 uses a dual-input-stage architecture: a PNP pair active from V– to ~1.2V below V+, and an NPN pair active near V+, enabling true rail-to-rail common-mode input range (0V to VS). Its complementary common-emitter output stage supports rail-to-rail swing within 20mV of either supply under 5mA load.

It features internal bias current cancellation circuitry that maintains input bias current ≤250nA across its full input common-mode range, and achieves 85V/mV open-loop gain with 105dB CMRR and 97dB PSRR - critical for precision DC-coupled amplification in single-supply sensor interfaces and active filter stages.

Key Specifications

Pinout & Package

LT1801IMS8 is housed in an 8-lead plastic MSOP (Mini Small Outline Package), 3mm × 3mm footprint, 0.65mm lead pitch, with exposed pad internally connected to V– (optional PCB connection for thermal enhancement).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8628ARMZ and OPA2350UA, the LT1801IMS8 uniquely balances 80MHz bandwidth, <350µV offset, rail-to-rail I/O, and MSOP-8 size - making it optimal for space-constrained, wideband precision signal chains where both speed and DC accuracy matter.

Availability

LT1801IMS8 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical instrumentation, and high-resolution data acquisition systems requiring stable component supply and long-term obsolescence management.

Supply support for LT1801IMS8 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 continuity, datasheet support, and manufacturing for the LT1801 family.

The LT1801 series was designed specifically for high-speed, low-power, rail-to-rail precision amplification in space- and power-constrained industrial and medical systems - emphasizing bandwidth, DC accuracy, and supply flexibility.

FAQ

What is the maximum supply voltage for the LT1801IMS8?

The LT1801IMS8 supports a total supply voltage of up to 12.6V - meaning it operates on single supplies from 2.3V to 12.6V, or split supplies such as ±5V (10V total) or ±6.3V (12.6V total). Absolute maximum rating is 12.6V between V+ and V–; exceeding this risks permanent damage. The LT1801IMS8 is not rated for 15V operation.

Does the LT1801IMS8 have rail-to-rail output swing under load?

Yes, the LT1801IMS8 delivers rail-to-rail output swing: within 20mV of V+ or V– at no load, and within 200mV at 5mA sink/source current. At 20mA, typical swing is 225mV low and 450mV high - confirmed in the Electrical Characteristics table under VOL/VOH conditions. This behavior holds across the full –40°C to +85°C temperature range.

Is the LT1801IMS8 pin-compatible with other dual op amps in MSOP-8?

No - the LT1801IMS8 uses the industry-standard dual op amp pinout (OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B), but pin compatibility cannot be assumed without verifying each parameter. For example, while OPA2350UA shares the same pin numbering, its VOS (1.5mV max) and GBW (38MHz) differ significantly; direct substitution may degrade system performance unless validated in the target circuit.

What is the input bias current specification for the LT1801IMS8 at 25°C?

At TA = 25°C and VCM = 1V, the LT1801IMS8 has a maximum input bias current of 250nA. Typical value is 25nA. This low bias current is maintained across its full input common-mode range (V– to V+) due to internal cancellation circuitry - critical for high-source-impedance applications like photodiode transimpedance amplifiers or pH probe buffers.

Can the LT1801IMS8 drive a 50Ω load reliably?

The LT1801IMS8 can source/sink up to 50mA short-circuit current, but continuous 50Ω load drive requires thermal evaluation. At ±5V supply, driving 50Ω to mid-rail dissipates ~0.125W per amplifier. With θJA = 160°C/W (MSOP), junction temperature rise is ~20°C - well within limits. However, sustained full-swing 50Ω drive at high ambient temperatures may require PCB copper area on Pin 4 (V–/exposed pad) for heat sinking.