Analog Devices Inc. LT1801IS8

Overview

LT1801IS8 from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail input and output precision operational amplifier in an 8-lead SO package, rated for –40°C to +85°C operation. It delivers 80MHz gain bandwidth, 25V/µs slew rate, <350µV max input offset voltage, and 2mA/amplifier quiescent current - enabling high-fidelity signal conditioning in low-voltage, space-constrained industrial sensor interfaces and data acquisition front-ends.

For engineers reviewing the LT1801IS8 datasheet, LT1801IS8 pinout, LT1801IS8 application, or LT1801IS8 equivalent, this page provides verified package mapping, validated dual-op-amp pin configuration, confirmed rail-to-rail I/O behavior across 2.3V–12.6V supplies, and real-world performance trade-offs versus alternatives for precision analog signal chains.

Technical Context

The LT1801IS8 employs a dual-input-stage architecture (PNP/NPN) that enables true rail-to-rail common-mode input range (V_S– to V_S+) and rail-to-rail output swing (within 20mV of either rail). Its complementary common-emitter output stage supports ±50mA short-circuit current and maintains stability with capacitive loads up to 1000pF when series output resistance is applied.

It operates from single supplies as low as 2.3V or split supplies up to ±6.3V, with guaranteed DC precision (input bias current ≤250nA, CMRR ≥105dB typ, PSRR ≥97dB typ) across its full –40°C to +85°C industrial temperature range - making it suitable for battery-powered instrumentation and mixed-signal systems where supply headroom and DC accuracy are critical.

Key Specifications

Pinout & Package

LT1801IS8 is housed in an 8-lead plastic SO (SOIC-8) package with standard dual op-amp pinout and exposed thermal pad internally connected to V– (pin 4), supporting PCB thermal relief via V– plane connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2333AIDR and AD8602ARZ, the LT1801IS8 uniquely balances high speed (80MHz/25V/µs), rail-to-rail operation, and industrial temperature rating - making it irreplaceable in dual-channel, medium-bandwidth precision analog systems where both AC fidelity and DC accuracy are simultaneously required.

Availability

LT1801IS8 is available at Aetrix Electronics and suitable for industrial sensor interfaces, high-speed data acquisition front-ends, and rail-to-rail video line drivers requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LT1801IS8 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) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs, serving industrial, automotive, communications, and healthcare markets.

The LT1801IS8 belongs to Linear's legacy high-speed precision op-amp product line, designed specifically for applications demanding rail-to-rail I/O, low power, and robust DC performance in harsh industrial environments.

FAQ

What is the maximum supply voltage for the LT1801IS8?

The LT1801IS8 has an absolute maximum total supply voltage (V_S+ to V_S–) of 12.6V. It is fully specified and characterized from 2.3V to 12.6V single supply or ±1.15V to ±6.3V split supplies. Operation beyond 12.6V risks permanent damage per Absolute Maximum Ratings.

Does the LT1801IS8 support rail-to-rail input with split supplies?

Yes - the LT1801IS8 guarantees rail-to-rail input common-mode range from V_S– to V_S+ under all supply conditions, including ±5V operation. This allows direct connection of bipolar sensor outputs or DAC references without external level shifting, as confirmed in the Electrical Characteristics table (Input Common Mode Range = V_S– to V_S+).

What is the typical output current capability of the LT1801IS8?

The LT1801IS8 delivers ≥50mA typical short-circuit output current per amplifier (ISC = 50mA typ at ±5V), with guaranteed minimum output swing of 20mV from each rail into 1kΩ loads. At 20mA sink/source, output swing remains within 500mV of rails - enabling direct drive of moderate-impedance loads like 75Ω video lines or ADC input networks.

Is the LT1801IS8 pin-compatible with other dual op-amps in SO-8 packages?

No - while the LT1801IS8 uses the industry-standard dual op-amp SO-8 pinout (pins 1/2/3/4/5/6/7/8 = OUT A/–IN A/+IN A/V–/V+/OUT B/–IN B/+IN B), its internal architecture (dual-input PNP/NPN stage) and rail-to-rail behavior differ fundamentally from legacy parts like LM358 or TL082. Direct substitution requires verification of input/output swing, bias current, and stability with capacitive loads.

What thermal considerations apply to the LT1801IS8 in SO-8 package?

The LT1801IS8 in SO-8 has θ_JA = 190°C/W. With 4mA total supply current at ±5V (P_D ≈ 0.04W), junction temperature rise is ~7.6°C above ambient. For worst-case 20mA output loading per channel, thermal design must ensure T_J ≤150°C - achieved by connecting pin 4 (V–) to a ≥1cm² copper pour, as noted in the Applications Information section.