Analog Devices Inc. LT1461CIS8-5#PBF

Overview

LT1461CIS8-5#PBF from Analog Devices is a micropower precision low-dropout series voltage reference delivering 5.0V output with ±0.08% initial accuracy, 12ppm/°C max temperature coefficient, and 35µA typical supply current. It features 50mA output drive, <300mV dropout at 10mA, and shutdown control-enabling use in portable instrumentation, precision ADC/DAC biasing, and battery-powered industrial sensors.

For engineers reviewing the LT1461CIS8-5#PBF datasheet, LT1461CIS8-5#PBF pinout, LT1461CIS8-5#PBF application, or LT1461CIS8-5#PBF equivalent, this page provides verified specifications, SO-8 package layout, thermal hysteresis data (75ppm over –40°C to 85°C), load regulation (30ppm/mA), and validated alternative options for precision analog systems requiring stable 5V reference performance across industrial temperature ranges.

Technical Context

The LT1461CIS8-5#PBF employs curvature-compensated bandgap architecture with trimmed thin-film resistors to achieve high DC accuracy and low drift. Its internal shutdown circuit enables full-load switching with logic-level control (Pin 3), while thermal limiting protects against overload up to 150°C junction temperature.

Designed for operation from –40°C to +85°C, it maintains specified performance with VIN as low as VOUT + 0.2V (typical) and supports output capacitance ≥2µF for stability. Line regulation is 8ppm/V (max), and load regulation is 30ppm/mA (max) under 50mA sourcing conditions.

Key Specifications

Pinout & Package

LT1461CIS8-5#PBF uses an 8-lead plastic SO (SO-8) package with exposed pad not connected internally. Pin 1 is marked by notch or dot; pins are numbered counterclockwise. Thermal resistance θ_JA = 190°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF5050IDR and ADR4550BRZ, the LT1461CIS8-5#PBF offers the lowest quiescent current (35µA vs. ≥100µA) and integrated shutdown-making it optimal for intermittent-sampling, battery-constrained systems where power efficiency and controlled wake-up are primary design drivers.

Availability

LT1461CIS8-5#PBF is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and portable medical devices requiring stable component supply with guaranteed industrial temperature range performance.

Supply support for LT1461CIS8-5#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LT1461 family was designed specifically for low-power, high-accuracy voltage reference applications in portable and space-constrained systems-emphasizing micropower operation, low dropout, and robust thermal performance without sacrificing precision.

FAQ

What is the maximum load current supported by the LT1461CIS8-5#PBF?

The LT1461CIS8-5#PBF guarantees ≥50mA output current under specified conditions (VIN ≥ VOUT + 2.5V). It can deliver up to 100mA short-circuit current, but sustained operation above 50mA requires careful thermal design due to SO-8 package limitations (θ_JA = 190°C/W). For continuous 50mA loads, keep ambient temperature ≤60°C to avoid thermal shutdown activation.

Does the LT1461CIS8-5#PBF require external capacitors, and if so, what values?

Yes-the LT1461CIS8-5#PBF requires both input and output capacitors for stability. A minimum 1µF ceramic capacitor is needed on VIN (Pin 2), and ≥2µF ceramic is required on VOUT (Pin 6) for loads up to 50mA. These values are specified in the Applications Information section and validated across temperature; omitting them risks oscillation or degraded load regulation performance.

How does the shutdown feature of the LT1461CIS8-5#PBF operate?

The LT1461CIS8-5#PBF enters shutdown when Pin 3 (SHDN) is pulled to ≤0.5V, reducing supply current to ≤35µA while disabling VOUT. It resumes normal operation within 200µs when SHDN rises to ≥2.4V. The pin draws ≤4µA in logic-low state and ≤15µA in logic-high state-compatible with standard microcontroller GPIO outputs without level-shifting.

What is the thermal hysteresis specification for the LT1461CIS8-5#PBF?

The LT1461CIS8-5#PBF exhibits 75ppm thermal hysteresis over the –40°C to +85°C temperature range, measured as the reversible output voltage shift after cycling between extremes and returning to 25°C. This value is confirmed in the Electrical Characteristics table and reflects mechanical stress effects from PC board mounting-not inherent semiconductor drift.

Is the LT1461CIS8-5#PBF RoHS-compliant and lead-free?

Yes-the "#PBF" suffix in LT1461CIS8-5#PBF explicitly denotes lead-free finish per RoHS Directive 2011/65/EU. Analog Devices confirms full compliance, including exemption 7a (lead in high-melting-temperature type solders) where applicable. The part is qualified for reflow soldering per JEDEC J-STD-020, with peak temperature ≤260°C.