Analog Devices Inc. LTC6269HMS8E#PBF

Overview

LTC6269HMS8E#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, 500MHz FET-input operational amplifier optimized for ultra-low input bias current (±3fA typ. at 25°C), 450fF common-mode input capacitance, and rail-to-rail output swing. It operates from 3.1V to 5.25V, draws 16.5mA per amplifier, and features shutdown control-making it ideal for high-impedance photodiode transimpedance amplifiers, CCD output buffering, and precision sensor front-ends in optical detection systems.

For engineers reviewing the LTC6269HMS8E#PBF datasheet, LTC6269HMS8E#PBF pinout, LTC6269HMS8E#PBF application, or LTC6269HMS8E#PBF equivalent, key selection criteria include verified fA-level input bias current over –40°C to 125°C, confirmed 350MHz –3dB bandwidth at unity gain, validated MSOP-8 package pin compatibility with guard ring layout support, and documented low-noise performance (4.3nV/√Hz voltage noise, 5.5fA/√Hz current noise at 100kHz).

Technical Context

The LTC6269HMS8E#PBF employs a CMOS input buffer stage that bootstraps ESD protection diodes to minimize leakage, enabling its ±3fA typical input bias current. Its complementary differential input pair covers the full input common-mode range (V– to V+ – 0.5V), with seamless handoff between PNP- and NPN-dominated regions.

Stability in transimpedance configurations is ensured by internal compensation tuned for low C_IN (450fF common-mode), while the rail-to-rail output stage uses common-emitter topology to deliver 400V/µs slew rate and <200mV saturation voltage at 25mA load-critical for fast settling into SAR ADC drivers.

Key Specifications

Pinout & Package

The LTC6269HMS8E#PBF is housed in an 8-lead MSOP package with exposed pad (pin 9 connected to V–). The exposed pad improves thermal dissipation (θ_JA = 40°C/W) and must be soldered to PCB ground for optimal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2140IDGKR and ADA4817-2ARMZ, the LTC6269HMS8E#PBF uniquely balances femtoamp bias current, 450fF input capacitance, and 500MHz GBW-enabling stable, high-bandwidth transimpedance gain where leakage and parasitic capacitance are dominant error sources.

Availability

LTC6269HMS8E#PBF is available at Aetrix Electronics and suitable for optical sensing, medical imaging, and industrial test equipment requiring stable component supply across extended temperature ranges.

Supply support for LTC6269HMS8E#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 legacy of high-performance analog ICs for precision signal conditioning.

The LTC6269HMS8E#PBF belongs to the LTC6268/LTC6269 family-engineered specifically for ultra-low-leakage, high-speed amplification in photonics, scientific instrumentation, and high-resolution data acquisition.

FAQ

What is the maximum operating temperature specification for the LTC6269HMS8E#PBF?

The LTC6269HMS8E#PBF is fully specified over the –40°C to +125°C junction temperature range, with absolute maximum ratings extending to +150°C. This H-grade qualification makes it suitable for under-hood automotive LiDAR receivers and industrial laser scanning systems where ambient temperatures exceed 85°C.

Does the LTC6269HMS8E#PBF require external compensation for transimpedance amplifier stability?

No, the LTC6269HMS8E#PBF does not require external compensation for basic transimpedance operation. Its internal compensation is optimized for low C_IN (450fF), enabling stable 65MHz bandwidth with 20kΩ feedback as demonstrated in LTC6268/LTC6269 datasheet Figure TA01. For higher feedback resistances (>100kΩ), a small feedback capacitor (e.g., 0.18pF for 100kΩ/5pF C_IN) is recommended per datasheet Table 1.

How is the exposed pad on the LTC6269HMS8E#PBF connected internally?

The exposed pad (pin 9) of the LTC6269HMS8E#PBF is electrically connected to the V– terminal and serves as both thermal conduction path and electrical ground reference. Per datasheet MS8E package drawing, it must be soldered to a PCB copper pour tied to the system ground plane to achieve the specified θ_JA = 40°C/W and ensure EMI immunity.

Can the LTC6269HMS8E#PBF drive a 10-bit SAR ADC directly without external buffering?

Yes, the LTC6269HMS8E#PBF can directly drive 10-bit SAR ADCs such as the AD7980. Its rail-to-rail output swing (≤200mV headroom), 400V/µs slew rate, and 17ns 0.1% settling time meet the dynamic requirements for 1MSPS sampling. The 4.3nV/√Hz input voltage noise contributes <0.5LSB noise at 10-bit resolution when driving 1kΩ ADC inputs.

What is the shutdown behavior of the LTC6269HMS8E#PBF regarding output state?

When the SHDN pin is pulled low (<0.75V), the LTC6269HMS8E#PBF places both outputs (OUTA and OUTB) into high-impedance state within 480ns (t_OFF). During shutdown, output leakage is limited to ±400nA (V_OUT = 0V or 5V), preventing unintended loading of downstream circuitry-a critical feature in multiplexed optical sensor arrays.