Analog Devices Inc. LT1804IS8#PBF

Overview

LT1804IS8#PBF from Analog Devices (formerly Linear Technology) is a dual rail-to-rail input and output operational amplifier optimized for high-speed, low-voltage signal conditioning. It delivers 100 V/µs slew rate, 85 MHz gain bandwidth product, ±42 mA output drive, 21 nV/√Hz input voltage noise, and operates from 2.3 V to 12.6 V supplies across –40°C to 85°C. It is used in precision A/D driver stages where full dynamic range utilization is critical.

For engineers reviewing the LT1804IS8#PBF datasheet, LT1804IS8#PBF pinout, LT1804IS8#PBF application, or LT1804IS8#PBF equivalent, key selection criteria include rail-to-rail I/O swing within 20 mV of rails, channel-to-channel matching (≤6.5 mV V_OS match), low quiescent current (3.1 mA per amplifier), and stable operation with capacitive loads up to 1000 pF.

Technical Context

The LT1804IS8#PBF employs a dual-input-stage architecture: a PNP pair active from V_S– to ~1.3 V below V_S+, and an NPN pair active near V_S+, enabling true rail-to-rail common-mode input range (V_S– to V_S+). Its complementary common-emitter output stage supports rail-to-rail output swing with <20 mV saturation at 5 mA load.

It features internal bias current cancellation circuitry that maintains input bias current ≤200 nA over 0.2 V above V_S– to 1.75 V below V_S+, and achieves 90 dB PSRR and 95 dB CMRR at DC while sustaining >75 MHz GBW under ±5 V or single 5 V supply conditions.

Key Specifications

Pinout & Package

LT1804IS8#PBF is housed in an 8-pin plastic SO (S8) package with standard dual op amp pinout and JEDEC MS-012AC footprint. Thermal resistance θ_JA = 190°C/W; maximum junction temperature = 150°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADA4891-2ARZ and OPA2350UA, the LT1804IS8#PBF offers superior balance of speed (85 MHz), power (3.1 mA), and rail-to-rail flexibility in industrial temperature grade, making it optimal for cost-constrained, wide-bandwidth signal chain stages where moderate noise is acceptable.

Availability

LT1804IS8#PBF is available at Aetrix Electronics and suitable for instrumentation signal conditioning, high-speed data acquisition, video line driving, and rail-to-rail active filter applications requiring stable component supply across extended temperature ranges.

Supply support for LT1804IS8#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 acquired Linear Technology in 2017 and maintains its high-performance analog portfolio, emphasizing precision, speed, and reliability in signal conditioning ICs.

The LT1803/LT1804/LT1805 family was designed for high-fidelity, low-voltage analog signal paths in industrial, medical, and test equipment-specifically targeting applications needing rail-to-rail operation without sacrificing bandwidth or DC accuracy.

FAQ

What is the operating temperature range guaranteed for the LT1804IS8#PBF?

The LT1804IS8#PBF is specified and production-tested over the industrial temperature range of –40°C to +85°C. This is confirmed by the "I" grade designation in the part number and validated in the Absolute Maximum Ratings and Electrical Characteristics tables under the "G" column denoting –40°C ≤ T_A ≤ 85°C conditions. The LT1804IS8#PBF maintains all listed parameters-including 85 MHz GBW and 100 V/µs slew rate-within this full range.

Does the LT1804IS8#PBF support single-supply operation?

Yes, the LT1804IS8#PBF supports true single-supply operation from 2.3 V to 12.6 V total supply voltage. Its rail-to-rail input stage accepts common-mode voltages from V_S– (ground in single-supply mode) to V_S+, and its output swings within 20 mV of both rails. This allows direct interfacing with 3.3 V or 5 V ADCs and sensors without level-shifting circuitry. The LT1804IS8#PBF datasheet explicitly specifies performance at 3 V, 5 V, and ±5 V supplies.

What is the maximum capacitive load the LT1804IS8#PBF can drive stably?

The LT1804IS8#PBF remains stable with capacitive loads up to 1000 pF when a series output resistor of ≤10 Ω is used-per Figure 30 and Figure 31 in the datasheet. Without the series resistor, stability degrades beyond ~100 pF. This behavior is due to its current-feedback-like output stage topology. For loads >100 pF, the recommended design practice is to add a 5–10 Ω resistor in series with the output trace, placed as close as possible to the LT1804IS8#PBF pin.

How does input stage crossover affect offset voltage in the LT1804IS8#PBF?

The LT1804IS8#PBF uses a dual-input-stage architecture: a PNP pair active from V_S– to ~1.3 V below V_S+, and an NPN pair active near V_S+. Input offset voltage shifts by ≤1 mV across the crossover region (V_CM ≈ V_S+ – 1.3 V), as documented in the "Input Offset Shift" parameter (ΔV_OS ≤ 1.00 mV). This transient is observable in precision DC-coupled applications but does not impact AC-coupled or buffered configurations. The LT1804IS8#PBF's typical V_OS remains ≤4 mV across the full range.

Is the LT1804IS8#PBF pin-compatible with other packages in the LT1803/LT1804/LT1805 family?

No-the LT1804IS8#PBF in the 8-pin SO package shares the standard dual op amp pinout (pin 1 = OUT A, pin 2 = –IN A, etc.), but it is not pin-compatible with the LT1804IDD (8-pin DFN) due to different pin assignments and thermal pad configuration. The SO-8 and DFN packages have distinct footprints and thermal characteristics; PCB layout must be redesigned when switching between them. The LT1804IS8#PBF pinout matches industry-standard dual op amps such as the OP27 or AD822, not other LT180x variants in non-SO packages.