Analog Devices Inc. LT1461BCS8-3.3#TRPBF

Overview

LT1461BCS8-3.3#TRPBF from Analog Devices is a micropower precision low-dropout series voltage reference delivering 3.3V output with ±0.06% initial accuracy, 7ppm/°C max temperature coefficient, 35µA supply current, 50mA output drive, and <300mV dropout at 50mA - used in high-resolution ADC/DAC biasing, portable instrument power rails, and precision regulator feedback paths.

For engineers reviewing the LT1461BCS8-3.3#TRPBF datasheet, LT1461BCS8-3.3#TRPBF pinout, LT1461BCS8-3.3#TRPBF application, or LT1461BCS8-3.3#TRPBF equivalent, key selection criteria include guaranteed operation from –40°C to 85°C, shutdown control capability, thermal hysteresis of ≤75ppm over –40°C to 85°C, and SO-8 package compatibility with standard PCB layout practices for stress-sensitive analog systems.

Technical Context

The LT1461BCS8-3.3#TRPBF employs curvature-compensated bandgap architecture with trimmed thin-film resistors to achieve its 7ppm/°C tempco and ±0.06% initial accuracy across –40°C to 85°C. Its internal thermal shutdown activates at ~150°C junction temperature, protecting against overload-induced drift.

It features active shutdown control (Pin 3), drawing ≤35µA in shutdown mode while maintaining full 50mA sourcing capability when enabled. Load regulation is specified at 12ppm/mA (typical), and line regulation is ≤8ppm/V over VIN = VOUT + 0.5V to 20V.

Key Specifications

Pinout & Package

LT1461BCS8-3.3#TRPBF is housed in an 8-lead plastic SO (SO-8) package with θJA = 190°C/W and JEDEC MS-012AC compliant footprint. Pin 1 is located at the top-left corner with dot marking; leads are gull-wing, lead-free (Pb-free) finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3333AIDBVR and ADR4533BRZ, LT1461BCS8-3.3#TRPBF uniquely balances micropower (35µA), high drive (50mA), shutdown control, and industrial-grade tempco (7ppm/°C) in SO-8 - making it optimal for portable instrumentation and precision regulators where both efficiency and robustness matter.

Availability

LT1461BCS8-3.3#TRPBF is available at Aetrix Electronics and suitable for portable data acquisition, industrial sensor transmitters, and precision power supply feedback requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LT1461BCS8-3.3#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 consumer markets.

The LT1461 family was designed for precision analog systems demanding low drift, low power, and high output drive - particularly in battery-operated instrumentation, industrial automation, and high-resolution data conversion.

FAQ

What is the maximum allowable input voltage for LT1461BCS8-3.3#TRPBF?

The absolute maximum input voltage for LT1461BCS8-3.3#TRPBF is 20V, as specified in the Absolute Maximum Ratings table. Operating above this voltage risks permanent damage. For reliable operation, VIN should be maintained between (VOUT + 0.5V) and 20V - i.e., 3.8V to 20V - to ensure full specification compliance including line regulation and thermal performance. The LT1461BCS8-3.3#TRPBF remains functional up to 20V but derates output drive and increases self-heating above 15V.

Does LT1461BCS8-3.3#TRPBF require external capacitors, and if so, what values?

Yes, LT1461BCS8-3.3#TRPBF requires both input and output capacitors for stability. A minimum 1µF ceramic capacitor is recommended on VIN (CIN), and ≥2µF ceramic is required on VOUT (CL) for loads up to 50mA. The datasheet confirms CL = 2µF is used in all electrical characteristics testing. Omitting CL or using insufficient capacitance causes instability and degraded load regulation. The LT1461BCS8-3.3#TRPBF does not function reliably without these capacitors.

What is the guaranteed operating temperature range for LT1461BCS8-3.3#TRPBF?

The LT1461BCS8-3.3#TRPBF is guaranteed to operate over the industrial temperature range of –40°C to +85°C, as confirmed in the Order Information table and Electrical Characteristics notes. While the device remains functional from –40°C to 125°C per Note 2, all parametric specifications - including initial accuracy, tempco, load regulation, and shutdown behavior - are fully characterized and warranted only across –40°C to 85°C for this B-grade SO-8 variant.

How does the shutdown feature of LT1461BCS8-3.3#TRPBF behave electrically?

When the SHDN pin (Pin 3) is pulled ≤0.8V, LT1461BCS8-3.3#TRPBF enters shutdown mode, disabling the output and reducing supply current to ≤35µA. The output becomes high-impedance - not actively driven low - and resumes regulation within ~200µs after SHDN rises ≥2.4V. Input voltage must remain applied during shutdown. The LT1461BCS8-3.3#TRPBF draws no more than 4µA leakage into SHDN when held low, enabling direct GPIO control without level-shifting.

Is LT1461BCS8-3.3#TRPBF pin-compatible with other LT1461 variants?

Yes, all LT1461 variants in the SO-8 package - including LT1461ACS8-3.3#TRPBF, LT1461BCS8-3.3#TRPBF, LT1461CCS8-3.3#TRPBF, and LT1461DHS8-3.3#TRPBF - share identical pinout, footprint, and terminal functions. Differences lie solely in grade-specific parameters: initial accuracy (0.04% to 0.15%), tempco (3–20ppm/°C), and temperature range (0°C–70°C to –40°C–125°C). The LT1461BCS8-3.3#TRPBF can be substituted for other SO-8 3.3V variants without PCB changes, though performance specs must be verified for the target application.