Analog Devices Inc. LT1208CS8#PBF

Overview

LT1208CS8#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed voltage-feedback operational amplifier with 45MHz gain-bandwidth, 400V/µs slew rate, and unity-gain stability. It delivers ±12V output swing into 500Ω with ±15V supplies, supports ±2.5V to ±15V supply range, and achieves 90ns settling time to 0.1% for 10V steps-ideal for precision data acquisition and video signal conditioning.

For engineers reviewing the LT1208CS8#PBF datasheet, LT1208CS8#PBF pinout, LT1208CS8#PBF application, or LT1208CS8#PBF equivalent, key selection criteria include DC gain (7V/mV at RL = 500Ω), input offset voltage (≤3mV max), capacitive load drive capability, thermal resistance (θJA = 150°C/W in SOIC-8), and dual-amplifier channel isolation performance.

Technical Context

The LT1208CS8#PBF employs a single-stage bipolar complementary architecture optimized for fast settling and wideband operation. Its internal compensation ensures unity-gain stability while maintaining 50° phase margin and low overshoot (<30%) in transient response.

It features matched input bias currents (4–9µA), low input noise (22nV/√Hz at 10kHz), and robust common-mode rejection (86–98dB) across ±2.5V to ±15V supplies-enabling accurate amplification in mixed-signal systems with dynamic rail conditions.

Key Specifications

Pinout & Package

LT1208CS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC dimensions (3.9mm × 4.9mm × 1.5mm), gull-wing leads, and θJA = 150°C/W thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8056ARZ and OPA2691U, LT1208CS8#PBF uniquely balances unity-gain stability, ±12V output swing into 500Ω, and 45MHz GBW without external compensation-making it optimal for drop-in replacement in legacy Linear Technology-based instrumentation and video designs.

Availability

LT1208CS8#PBF is available at Aetrix Electronics and suitable for data acquisition systems, video signal conditioning, DAC interface circuits, and active filter designs requiring stable component supply across industrial temperature ranges (–40°C to 85°C).

Supply support for LT1208CS8#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 LT1208CS8#PBF belongs to Linear Technology's legacy high-speed op-amp family, designed specifically for demanding applications including data acquisition, video buffering, and precision instrumentation where unity-gain stability and fast settling are critical.

FAQ

What is the maximum capacitive load the LT1208CS8#PBF can drive without oscillation?

The LT1208CS8#PBF is stable with capacitive loads up to 10,000pF, as verified in large-signal transient testing (AI02). At 10,000pF, output slewing is limited by short-circuit current rather than phase margin collapse. For optimal pulse fidelity with coaxial cables, use double termination (75Ω series + 75Ω shunt) per TA06. The LT1208CS8#PBF does not require external isolation resistors for stability, unlike many competing high-speed op-amps.

Does the LT1208CS8#PBF support single-supply operation?

Yes, the LT1208CS8#PBF operates with total supply voltages as low as 5V (±2.5V), delivering 2VP-P undistorted output at 5MHz and 0.8VP-P at 3V total supply. Input common-mode range extends to –1.3V at ±2.5V supplies, enabling true single-supply configurations when biased above ground. The LT1208CS8#PBF maintains 26MHz GBW and 135V/µs slew rate under ±2.5V conditions-verified in Low Voltage Operation section (page 8).

What is the thermal resistance (θJA) of the LT1208CS8#PBF in its SOIC-8 package?

The LT1208CS8#PBF in the S8 (SOIC-8) package has a junction-to-ambient thermal resistance (θJA) of 150°C/W, as specified in the Absolute Maximum Ratings table (page 2) and Power Dissipation section (page 8). This value assumes standard JEDEC 2-layer board layout with no copper pour. For continuous 7mA per amplifier operation at ±15V, junction temperature rise is 1.05W × 150°C/W = 157.5°C above ambient-requiring derating or heatsinking above 70°C ambient.

How does the LT1208CS8#PBF achieve unity-gain stability without external compensation?

The LT1208CS8#PBF integrates internal dominant-pole compensation that ensures ≥50° phase margin at unity gain, as confirmed in Gain-Bandwidth vs Frequency plots (G13, G19). This eliminates need for external capacitors in follower or gain-of-one configurations. Unlike decompensated op-amps, the LT1208CS8#PBF maintains stability even with heavy capacitive loading due to output pole sensing and adaptive compensation-detailed in Capacitive Loading section (page 6).

What is the typical input bias current of the LT1208CS8#PBF at ±15V supply?

The typical input bias current of the LT1208CS8#PBF is 4µA at ±15V supply, with a maximum of 9µA over the full operating temperature range (–40°C to 85°C), per Electrical Characteristics table (page 3). This bipolar input stage bias current is well-matched between channels (IB+ ≈ IB–), minimizing offset drift in differential configurations. The LT1208CS8#PBF exhibits <0.1µA/°C drift, making it suitable for precision integrators and high-impedance sensor interfaces.