Analog Devices Inc. LTC6241CDD#PBF

Overview

LTC6241CDD#PBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail output, low-noise CMOS operational amplifier in an 8-lead 3mm × 3mm DFN package. It delivers 18MHz gain bandwidth, 10V/μs slew rate, 550nV_P-P 0.1Hz–10Hz noise, 125μV max input offset voltage (0°C to 70°C), and 0.2pA typical input bias current - optimized for high-impedance sensor signal conditioning in precision instrumentation.

For engineers reviewing the LTC6241CDD#PBF datasheet, LTC6241CDD#PBF pinout, LTC6241CDD#PBF application, or LTC6241CDD#PBF equivalent, key selection criteria include its guaranteed 1pA max input bias current at 25°C, rail-to-rail output swing within 30mV of rails, 2.8V to 6V single-supply operation, and matched dual-channel performance for differential amplification and active filtering.

Technical Context

The LTC6241CDD#PBF implements a unity-gain-stable CMOS input stage with ultra-low input bias current and low input capacitance (3.5pF differential, 3pF common-mode), enabling stable operation with high-source-impedance transducers. Its output stage uses complementary MOS architecture to achieve rail-to-rail swing while maintaining 10V/μs slew rate and 18MHz GBW under 2.8V–6V supply.

It features fully specified performance at 3V and 5V, with input common-mode range extending to the negative rail and output swing limited only by 30mV headroom at both rails. Channel-to-channel matching (e.g., 100μV max V_OS match over 0°C–70°C) supports precision differential configurations without external trimming.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 3mm) plastic DFN with underside thermal pad connected to V− (PCB connection optional). Pin 1 marked by dot; top-side marking "LBPD".

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADA4807-2ARMZ and OPA2189IDR, the LTC6241CDD#PBF uniquely balances ultra-low input bias current (0.2pA), low 0.1Hz–10Hz noise (550nV_P-P), and rail-to-rail output in a compact DFN - making it optimal for high-Z sensor interfaces where leakage and low-frequency noise are primary constraints.

Availability

LTC6241CDD#PBF is available at Aetrix Electronics and suitable for photodiode amplification, medical biopotential acquisition, and high-impedance transducer signal conditioning requiring stable component supply across industrial and healthcare OEM programs.

Supply support for LTC6241CDD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017.

The LTC6240/LTC6241/LTC6242 family was designed specifically for precision, low-noise, high-input-impedance signal conditioning in medical, scientific, and test equipment - emphasizing ultra-low bias current, low 1/f noise, and rail-to-rail output in miniature packages.

FAQ

What is the maximum input bias current specification for LTC6241CDD#PBF over temperature?

The LTC6241CDD#PBF guarantees ≤1pA maximum input bias current at 25°C. Over the full 0°C to 70°C operating range, the datasheet specifies 75pA max (typical 0.2pA), validated per Electrical Characteristics Table on page 5 of the LTC6240/LTC6241/LTC6242 datasheet (624012fe). This makes LTC6241CDD#PBF suitable for applications requiring sub-picoampere leakage control.

Does LTC6241CDD#PBF support true rail-to-rail input common-mode range?

No - the LTC6241CDD#PBF features rail-to-rail *output* swing (within 30mV of V+ and V−), but its input common-mode range extends only to the negative rail (V−) and up to 3.5V below V+ at 5V supply (0V to 3.5V). It does not accept inputs beyond V+ or below V−, and is not a rail-to-rail input op amp. This is confirmed in Absolute Maximum Ratings and Electrical Characteristics sections of the LTC6240/LTC6241/LTC6242 datasheet.

What is the thermal pad connection requirement for the DFN package of LTC6241CDD#PBF?

The underside metal pad of the LTC6241CDD#PBF's 8-lead DFN package is internally connected to V−. The datasheet states PCB connection is optional but recommended for improved thermal performance and lower junction temperature. When used, the pad should be soldered to a V− copper pour with thermal vias to internal ground planes. No isolation or floating connection is required or recommended.

Can LTC6241CDD#PBF operate from a single 3.3V supply?

Yes - the LTC6241CDD#PBF is fully specified for 3V and 5V single-supply operation, with minimum supply voltage of 2.8V. At 3.3V, it maintains rail-to-rail output swing (≤30mV from rails), 125μV max input offset (0°C–70°C), and 18MHz gain bandwidth. Input common-mode range is 0V to 1.5V, and output can drive ≥1mA loads while preserving linearity - verified in Electrical Characteristics tables for VS = 3V, 0V conditions.

How does the channel-to-channel offset voltage match of LTC6241CDD#PBF compare to the SO-8 version?

The LTC6241CDD#PBF (DFN package) has a maximum V_OS match of 100μV over 0°C–70°C, whereas the SO-8 version (LTC6241CS8#PBF) is specified at 40μV max under identical conditions. This difference arises from package-induced thermal gradients and die placement variation - the DFN's smaller footprint and symmetric layout yield slightly less matching than the larger SO-8, but remains sufficient for most dual-channel precision applications as documented in Table on page 5 of the datasheet.