Analog Devices Inc. LT1802CS#TRPBF

Overview

LT1802CS#TRPBF from Analog Devices (formerly Linear Technology) is a quad rail-to-rail input/output precision operational amplifier optimized for low-voltage, high-speed signal conditioning. It delivers 80MHz gain bandwidth, 25V/µs slew rate, <350µV input offset voltage, and operates from 2.3V to 12.6V single or ±5V dual supplies - enabling high-fidelity buffering in data acquisition front-ends and sensor interfaces.

For engineers reviewing the LT1802CS#TRPBF datasheet, LT1802CS#TRPBF pinout, LT1802CS#TRPBF application, or LT1802CS#TRPBF equivalent, this page provides verified package mapping (14-lead SO), confirmed rail-to-rail I/O behavior, channel-matched DC specs, thermal derating guidance, and real-world alternatives validated for quad op amp replacement in precision analog signal chains.

Technical Context

The LT1802CS#TRPBF uses a dual-input-stage architecture: a PNP pair active from V– to ~1.2V below V+, and an NPN pair taking over 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 maintains stable unity-gain operation with >60° phase margin across 2.5V–10V supplies and exhibits <1.5µV/°C offset drift. Input bias current remains <250nA over its full common-mode range, and open-loop gain exceeds 70V/mV at 3V supply into 1kΩ load - critical for high-impedance transducer interfacing.

Key Specifications

Pinout & Package

LT1802CS#TRPBF is housed in a 14-lead plastic SO (Small Outline) package with standard quad op amp pinout and exposed pad internally connected to V– for thermal enhancement. PCB layout must connect Pin 11 (V–) to a solid ground plane to achieve θJA = 190°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8604ARUZ and TLV2464IDR, the LT1802CS#TRPBF uniquely balances 80MHz bandwidth, rail-to-rail I/O, and sub-350µV offset in a production-qualified SO-14 package - making it the only option among the three capable of driving 10-bit+ ADCs at >1MSPS without gain error or settling penalty.

Availability

LT1802CS#TRPBF is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and test & measurement equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for LT1802CS#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 product support, datasheets, SPICE models, and application expertise for the LT180x family.

The LT1802CS#TRPBF belongs to Linear's precision high-speed op amp product line, designed specifically for applications demanding both wide bandwidth and rail-to-rail operation in low-voltage systems - bridging the gap between legacy general-purpose op amps and specialized high-speed amplifiers.

FAQ

What is the maximum capacitive load the LT1802CS#TRPBF can drive without instability?

The LT1802CS#TRPBF remains stable driving up to 100pF directly, but for loads >50pF, a series output resistor (ROS) of 10–20Ω is recommended to suppress peaking. At 1000pF, ROS = 50Ω reduces overshoot to <15% in unity-gain buffer configurations per Figure G28/G29 in the datasheet. This behavior is consistent across all four amplifiers in the LT1802CS#TRPBF.

Does the LT1802CS#TRPBF support single-supply operation below 3V?

Yes - the LT1802CS#TRPBF is fully specified down to 2.3V total supply (e.g., 2.3V single-ended or ±1.15V split), with guaranteed performance including rail-to-rail input range, 20mV output swing, and 80MHz GBW. At 2.5V supply, typical supply current is 2.1mA per amplifier, and open-loop gain remains >65V/mV into 1kΩ.

How does input stage crossover affect offset voltage in the LT1802CS#TRPBF?

The LT1802CS#TRPBF's PNP input stage dominates from V– to ~1.2V below V+, delivering <75µV typical offset; the NPN stage activates above that threshold with <100µV typical offset. The transition region around V+ – 1.2V causes a step change of ≤25µV in VOS - documented in Figure G04 and accounted for in the 350µV max specification across the full range.

Can the LT1802CS#TRPBF be used in parallel to increase output current?

No - the LT1802CS#TRPBF is not designed for paralleling. Its output stage lacks current-sharing circuitry, and mismatched offsets or gains between amplifiers would cause destructive circulating currents. For >50mA drive, use a single-channel high-current op amp like the LT1010 or add an external discrete follower stage.

Is the LT1802CS#TRPBF pin-compatible with other quad op amps in SO-14 packages?

The LT1802CS#TRPBF uses the industry-standard quad op amp pinout (Pin 1=OUT A, Pin 2=–IN A, Pin 3=+IN A, Pin 4=V+, Pin 5=+IN B, Pin 6=–IN B, Pin 7=OUT B, Pin 8=OUT D, Pin 9=–IN D, Pin 10=+IN D, Pin 11=V–, Pin 12=+IN C, Pin 13=–IN C, Pin 14=OUT C), matching LM324, TL084, and AD8604 pinouts - enabling drop-in replacement where bandwidth and rail-to-rail performance are sufficient.