Analog Devices Inc. LT1008S8#PBF

Overview

LT1008S8#PBF from Analog Devices (formerly Linear Technology) is a precision operational amplifier designed for ultra-low-input-bias-current, microvolt-offset, low-noise analog signal conditioning in metrology and instrumentation. It delivers 120 μV max input offset voltage, 100 pA max input bias current at 25°C, 0.5 μV_P-P 0.1–10 Hz noise, 114 dB min CMRR/PSRR, and ±13 V output swing into 10 kΩ - enabling high-accuracy charge integration and thermocouple amplification.

For engineers reviewing the LT1008S8#PBF datasheet, LT1008S8#PBF pinout, LT1008S8#PBF application, or LT1008S8#PBF equivalent, key selection criteria include guaranteed picoampere bias current over temperature, microvolt-level long-term offset stability (0.3 μV/month), externally compensated bandwidth flexibility, and compatibility with LM108A/LM308A sockets in 8-lead SO packaging.

Technical Context

The LT1008S8#PBF employs a proprietary JFET-input stage with back-to-back protection diodes and dual external compensation terminals (COMP1, COMP2), enabling user-defined frequency response shaping via single-capacitor networks. Its architecture maintains sub-600 pA bias current across –55°C to 125°C and achieves 0.2–1.8 μV/°C offset drift depending on grade.

It operates from ±2 V to ±20 V supplies, supports 5 mA load current with >120 V/mV large-signal gain, and features rail-to-rail input voltage range (±13.5 V) and high common-mode rejection up to 132 dB - making it suitable for DC-coupled sensor front-ends where leakage and drift dominate error budgets.

Key Specifications

Pinout & Package

S8 package: 8-lead plastic small-outline (SOIC-N, 0.150" width), JEDEC MS-012AC compliant, RoHS-compliant lead-free finish (#PBF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op amp applications.

Compared with LT1012CN8#PBF and OPA2189IDR, the LT1008S8#PBF uniquely balances ultra-low bias current, microvolt offset, external compensation flexibility, and proven stability in legacy LM108A socket designs - making it irreplaceable for charge-integration and metrology-grade DC signal chains.

Availability

LT1008S8#PBF is available at Aetrix Electronics and suitable for precision instrumentation, charge-integration systems, thermocouple amplification, and low-frequency active filter design requiring stable component supply across extended product lifecycles.

Supply support for LT1008S8#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 precision analog portfolio, including legacy high-reliability op amps used in metrology and aerospace.

The LT1008S8#PBF belongs to Linear's universal precision op amp family, engineered specifically for applications demanding simultaneous picoampere input bias, microvolt offset, and low 0.1–10 Hz noise - targeting DC-coupled sensor interfaces where long-term stability dominates performance.

FAQ

What is the maximum operating temperature range for the LT1008S8#PBF?

The LT1008S8#PBF is specified for commercial temperature operation from 0°C to 70°C. Unlike the LT1008M (–55°C to 125°C) or LT1008I (–40°C to 85°C), the S8 package variant carries the 'C' grade rating, and all guaranteed specifications - including 40–280 μV offset voltage and ±120–±420 pA bias current - apply strictly within this 0°C to 70°C range.

Does the LT1008S8#PBF require external compensation capacitors?

Yes, the LT1008S8#PBF is externally compensated and requires a capacitor between COMP1 (Pin 1) and V– (Pin 4) for stable unity-gain operation. A 30 pF capacitor yields ~0.2 V/μs slew rate and 60° phase margin. For closed-loop gains above 200, no external compensation is needed, and slew rate increases to 4 V/μs - a key differentiator from internally compensated alternatives like the LT1012.

Can the LT1008S8#PBF replace LM108A or LM308A op amps directly?

Yes, the LT1008S8#PBF is pin-compatible with LM108A and LM308A in 8-lead SO packages and uses identical compensation networks. It provides upgraded DC performance - lower offset voltage, lower bias current, and improved CMRR/PSRR - while maintaining compatible AC behavior, enabling drop-in replacement in existing designs without PCB changes.

What is the purpose of Pin 5 (NC) on the LT1008S8#PBF?

Pin 5 on the LT1008S8#PBF is a no-connect terminal - internally unconnected and electrically isolated. It must remain unconnected on the PCB; routing traces to or grounding Pin 5 may introduce parasitic coupling or violate internal isolation barriers, potentially degrading noise or offset performance. This NC pin is retained for mechanical compatibility with other variants in the LT1008 family.

How does the LT1008S8#PBF achieve low 0.1–10 Hz noise performance?

The LT1008S8#PBF achieves 0.5 μV_P-P 0.1–10 Hz noise through a combination of JFET input stage optimization, low-1/f-noise die design, and matched internal transistor pairs that minimize correlated low-frequency fluctuations. This performance is measured using the standardized test circuit in the datasheet (Figure AI07) and is guaranteed - not typical - across the commercial temperature range.