Analog Devices Inc. LT1789IS8-1#PBF

Overview

LT1789IS8-1#PBF from Analog Devices (formerly Linear Technology) is a micropower, precision instrumentation amplifier optimized for single-supply operation from 2.2V to 36V, featuring 95μA max supply current, 100μV max input offset voltage, and rail-to-rail output swing within 110mV of ground - deployed in portable medical sensors and low-power bridge amplifiers.

For engineers reviewing the LT1789IS8-1#PBF datasheet, LT1789IS8-1#PBF pinout, LT1789IS8-1#PBF application, or LT1789IS8-1#PBF equivalent, key selection criteria include gain-setting resistor flexibility (G = 1 to 1000), guaranteed –40°C to 85°C industrial temperature operation, and laser-trimmed CMRR ≥96dB at G=10 - critical for high-accuracy DC-coupled signal conditioning.

Technical Context

The LT1789IS8-1#PBF implements a three-op-amp instrumentation architecture with laser-trimmed thin-film resistors, enabling precise gain accuracy (0.25% max gain error at G=10) and ultra-low drift (0.5μV/°C max input offset voltage drift). Its input stage operates down to the negative rail (V–), supporting true single-supply common-mode range to ground.

Output stage delivers rail-to-rail swing (within 110mV of V– and +VS–0.3V) while driving capacitive loads up to 400pF across all gains. ESD protection exceeds 10kV HBM on all pins, and PSRR reaches 100dB min at G=10 - essential for noisy industrial power rails.

Key Specifications

Pinout & Package

LT1789IS8-1#PBF is housed in an 8-lead plastic SO (Small Outline) package, occupying minimal PCB area versus discrete op-amp solutions while maintaining standard JEDEC MS-012AC footprint compatibility.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with AD8421ARMZ and INA333AIDRGT, LT1789IS8-1#PBF uniquely balances micropower operation (95μA), wide 2.2V–36V supply, and guaranteed industrial temperature performance - making it optimal for ruggedized, single-supply sensor interfaces where supply headroom and long-term stability are critical.

Availability

LT1789IS8-1#PBF is available at Aetrix Electronics and suitable for portable instrumentation, bridge amplifier systems, and thermocouple signal chains requiring stable component supply across extended temperature and voltage ranges.

Supply support for LT1789IS8-1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.

The LT1789 family was designed specifically for precision, low-power instrumentation in harsh environments - emphasizing laser-trimmed accuracy, rail-to-rail output, and robust single-supply operation from battery to industrial rails.

FAQ

What is the maximum capacitive load the LT1789IS8-1#PBF can drive stably?

The LT1789IS8-1#PBF is specified to drive capacitive loads up to 400pF in any gain configuration while maintaining stability and monotonic step response. This value is validated per the manufacturer's characterization and applies across the full operating temperature range (–40°C to 85°C) and supply range (2.2V to 36V). Exceeding 400pF may cause peaking or overshoot, requiring external isolation resistance if larger loads are unavoidable.

Does the LT1789IS8-1#PBF support true single-supply operation with inputs at ground?

Yes, the LT1789IS8-1#PBF supports true single-supply operation with inputs extending to the negative rail (V–, typically ground). Its input common-mode range includes V–, and the output swings within 110mV of V– - enabling direct interface with grounded sensors such as strain gauges and thermocouples without level-shifting circuitry. This capability is explicitly guaranteed in the datasheet for the LT1789IS8-1#PBF variant.

How is gain set on the LT1789IS8-1#PBF, and what is the minimum achievable gain?

Gain on the LT1789IS8-1#PBF is set by a single external resistor RG connected between Pins 1 and 8. For this variant (LT1789-1), gain follows G = 1 + (200kΩ / RG). The minimum gain of G = 1 is achieved by leaving Pins 1 and 8 open-circuited. This resistor-based configuration avoids trimming potentiometers and ensures repeatable, temperature-stable gain across production units.

What is the guaranteed input offset voltage specification for LT1789IS8-1#PBF over temperature?

The LT1789IS8-1#PBF guarantees a maximum input offset voltage of 175μV over the full industrial temperature range (–40°C to 85°C), as confirmed in the "ELECTRICAL CHARACTERISTICS" table under the "l" notation (–40°C ≤ T_A ≤ 85°C). This is tighter than the 205μV max specified for the commercial-grade LT1789CS8-1#PBF, reflecting its enhanced laser-trimming and screening for extended temperature operation.

Is the LT1789IS8-1#PBF RoHS-compliant and lead-free?

Yes, the LT1789IS8-1#PBF is RoHS-compliant and features a lead-free finish, as indicated by the "#PBF" suffix in the part number (Pb-Free). It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards. The "1789I1" marking on the device body further confirms its industrial-grade, lead-free construction.