Analog Devices Inc. LT1461BCS8-5#TRPBF

Overview

LT1461BCS8-5#TRPBF from Analog Devices is a precision 5V low-dropout micropower series voltage reference IC with ±0.06% initial accuracy, 7ppm/°C max temperature coefficient, 35µA typical supply current, and 50mA output drive capability. It operates from –40°C to 85°C and features shutdown control, thermal limiting, and excellent load/thermal regulation - ideal for high-resolution ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LT1461BCS8-5#TRPBF datasheet, LT1461BCS8-5#TRPBF pinout, LT1461BCS8-5#TRPBF application, or LT1461BCS8-5#TRPBF equivalent, key selection criteria include its 5V output stability under varying load (12ppm/mA), dropout voltage ≤300mV at 50mA, shutdown current ≤35µA, and SO-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LT1461BCS8-5#TRPBF uses curvature-compensated bandgap architecture with trimmed thin-film resistors to achieve tight initial accuracy and low drift. Its internal circuitry includes a dedicated shutdown input (Pin 3) that disables output while maintaining <35µA quiescent current, and thermal shutdown protection activates at ~150°C junction temperature.

It delivers regulated 5V output with line regulation ≤12ppm/V and load regulation ≤30ppm/mA across its full operating range. The device requires both input (≥1µF) and output (≥2µF) capacitors for stability and exhibits 8ppm_P-P (0.1–10Hz) and 9.6ppm_RMS (10Hz–1kHz) output noise - critical for 16-bit+ data conversion systems.

Key Specifications

Pinout & Package

LT1461BCS8-5#TRPBF is housed in an 8-lead plastic SO (SO-8) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, and θ_JA = 190°C/W. Pin 1 is top-left corner (notch/dot oriented), with Pin 3 as SHDN, Pin 4 as GND, Pin 6 as VOUT, and Pin 2 as VIN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5050IDR and ADR4550BRZ, LT1461BCS8-5#TRPBF uniquely balances micropower operation (35µA), integrated shutdown, and industrial-grade drift (7ppm/°C) - making it optimal for portable, battery-sensitive, and thermally variable applications where moderate precision suffices.

Availability

LT1461BCS8-5#TRPBF is available at Aetrix Electronics and suitable for precision instrumentation, portable medical devices, and industrial DAC/ADC subsystems requiring stable component supply with traceable lot control and long-term lifecycle support.

Supply support for LT1461BCS8-5#TRPBF 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, communications, automotive, and healthcare markets.

The LT1461 family was designed specifically for applications demanding high accuracy, low drift, and micropower operation in space- and energy-constrained systems - including portable test equipment, precision data acquisition, and battery-backed instrumentation.

FAQ

What is the maximum load current supported by LT1461BCS8-5#TRPBF without compromising output accuracy?

LT1461BCS8-5#TRPBF guarantees ≥50mA output current while maintaining specified accuracy. Load regulation is rated at ≤30ppm/mA (150ppm total shift at 50mA), corresponding to ≤0.75mV deviation from nominal 5V. For best accuracy, limit continuous load to 50mA and ensure adequate PCB copper area for thermal dissipation.

Does LT1461BCS8-5#TRPBF require external capacitors, and what values are recommended?

Yes, LT1461BCS8-5#TRPBF requires both input and output capacitors for stability. A minimum 1µF ceramic capacitor on VIN (Pin 2) and ≥2µF ceramic capacitor on VOUT (Pin 6) are mandatory. For loads >1mA, use 2µF or greater on VOUT; input bypass may share capacitance with adjacent ICs if within 2 inches.

How does the shutdown feature of LT1461BCS8-5#TRPBF operate, and what is its leakage current?

LT1461BCS8-5#TRPBF enters shutdown when Pin 3 (SHDN) is pulled below 0.5V. In shutdown, output is disabled and supply current drops to ≤35µA. Logic high (>2.4V) restores normal operation with ~200µs turn-on time. Shutdown current remains stable across temperature and does not require pull-up resistors.

What is the thermal performance limitation of LT1461BCS8-5#TRPBF in SO-8 package?

LT1461BCS8-5#TRPBF has θ_JA = 190°C/W in SO-8. At 50mA load and 5.3V input, power dissipation is ~15mW - causing negligible self-heating. However, at maximum 20V input and 50mA, dissipation reaches ~725mW, triggering thermal shutdown near 150°C junction temperature. Derate output current above 125°C case temperature.

Is LT1461BCS8-5#TRPBF qualified for automotive applications?

No - LT1461BCS8-5#TRPBF is rated for 0°C to 70°C commercial and –40°C to 85°C industrial temperature ranges. For automotive use, select the AEC-Q100 qualified LT1461DHS8-5#TRPBF variant, which is guaranteed from –40°C to 125°C and manufactured under automotive quality controls.