Analog Devices Inc. LT1490IS8#TRPBF

Overview

LT1490IS8#TRPBF from Analog Devices (formerly Linear Technology) is a dual rail-to-rail input and output micropower operational amplifier in an 8-lead MSOP package. It operates from total supply voltages of 2V to 44V, draws ≤50µA per amplifier, delivers ±20mA output current, supports rail-to-rail input common-mode range up to 44V beyond V–, and is specified over –40°C to +85°C for industrial battery monitoring and sensor conditioning.

For engineers reviewing the LT1490IS8#TRPBF datasheet, LT1490IS8#TRPBF pinout, LT1490IS8#TRPBF application, or LT1490IS8#TRPBF equivalent, key selection criteria include its reverse-battery protection to 18V, 200kHz gain-bandwidth product, 98dB CMRR, 1500V/mV open-loop gain, and ability to drive 10,000pF capacitive loads with optional compensation - critical for low-power precision signal conditioning in constrained environments.

Technical Context

The LT1490IS8#TRPBF employs a dual-input-stage architecture (NPN and PNP) enabling operation with inputs up to 44V above V– and 0.3V above V+, while maintaining high impedance and no phase reversal. Its unique input stage allows common-mode voltage operation from –0.4V to 44V on single 3V/5V supplies and ±15V split supplies.

Internally compensated for unity-gain stability, it drives ≥200pF capacitively without external components and supports up to 10,000pF with 0.22µF + 150Ω output compensation. The device features reverse supply protection (≤1nA leakage at –18V), no supply sequencing requirements, and shutdown capability via V+ removal.

Key Specifications

Pinout & Package

LT1490IS8#TRPBF is housed in an 8-lead MSOP (MS8) package, 3.0mm × 3.0mm × 0.85mm, with exposed pad for thermal enhancement. Pinout conforms to standard dual op amp configuration with independent input and output terminals per channel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1490AIS8#TRPBF, the LT1490IS8#TRPBF trades guaranteed offset performance for legacy design continuity and cost; compared with ADA4505-2ARZ, it sacrifices quiescent current for robust 44V operation and reverse-battery survivability - making it uniquely suited for harsh, wide-supply industrial sensing.

Availability

LT1490IS8#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, sensor signal conditioning, and 4–20mA transmitter designs requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.

Supply support for LT1490IS8#TRPBF 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 technical and manufacturing continuity for all Linear op amp products, including rigorous AEC-Q200 stress testing and industrial-grade qualification.

The LT1490IS8#TRPBF belongs to Linear's micropower precision op amp family, engineered specifically for high-voltage, low-quiescent-current signal conditioning in battery-powered and industrial monitoring systems where reliability under reverse polarity and wide supply variation is mandatory.

FAQ

What is the maximum total supply voltage supported by the LT1490IS8#TRPBF?

The LT1490IS8#TRPBF supports a total supply voltage (V+ to V–) of up to 44V. This allows operation from single 36V or 40V supplies, or split ±15V, ±18V, and ±22V rails. Operation above 30V requires controlled supply ramp rates (<1µs rise time) to prevent oscillation due to supply-line inductance interacting with bypass capacitors.

Does the LT1490IS8#TRPBF provide reverse battery protection, and how does it behave under reverse polarity?

Yes, the LT1490IS8#TRPBF provides reverse battery protection up to –18V on V– (with V+ grounded). Under this condition, supply current drops to less than 1nA per amplifier, preventing damage or excessive drain. The device remains non-conductive and resumes normal operation immediately upon restoration of correct polarity - no latch-up or reset required.

Can the LT1490IS8#TRPBF drive a 10,000pF capacitive load, and what compensation is required?

Yes, the LT1490IS8#TRPBF can drive up to 10,000pF when externally compensated with a 0.22µF capacitor in series with a 150Ω resistor connected between the output and ground. This network stabilizes the amplifier under heavy capacitive loading, preserving phase margin and preventing overshoot or ringing - verified across all supply voltages and temperatures in the datasheet.

What is the input common-mode voltage range of the LT1490IS8#TRPBF on a 3V single supply?

On a 3V single supply (V+ = 3V, V– = 0V), the LT1490IS8#TRPBF supports an input common-mode voltage range from –0.4V to 44V. This means inputs may be driven 0.4V below ground or up to 41V above ground - far exceeding the supply rails - enabling direct interface with high-side current-sense shunts and battery terminals without attenuation or clamping.

How does the LT1490IS8#TRPBF handle input voltages exceeding the positive supply rail?

The LT1490IS8#TRPBF incorporates Schottky diodes in its NPN input stage, allowing inputs to operate up to 0.3V above V+ with only ~4µA bias current and ~700µV offset. This feature enables safe "beyond-the-rail" sensing in applications such as hot-swap controllers or supply voltage supervisors where input signals transiently exceed the local supply.