Analog Devices Inc. LT1634ACS8-4.096#TRPBF

Overview

LT1634ACS8-4.096#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, precision shunt voltage reference delivering a stable 4.096V output with ±0.05% initial accuracy, 10ppm/°C max temperature drift, and 0.15Ω typical dynamic impedance. It operates from 20µA minimum current and is used in high-resolution data converters, portable instrumentation, and precision regulators where low power and tight voltage stability are critical.

For engineers reviewing the LT1634ACS8-4.096#TRPBF datasheet, LT1634ACS8-4.096#TRPBF pinout, LT1634ACS8-4.096#TRPBF application, or LT1634ACS8-4.096#TRPBF equivalent, this page provides verified electrical specifications, SO-8 package terminal mapping, real-world use cases in A/D converters and calibrators, and two validated alternative parts for design flexibility.

Technical Context

The LT1634ACS8-4.096#TRPBF uses trimmed thin-film resistors and an improved curvature correction technique to achieve its 0.05% initial accuracy and 10ppm/°C max drift over 0°C to 70°C. Its bandgap-based shunt architecture requires no output compensation capacitor and remains stable with capacitive loads up to 0.1µF.

It functions as a two-terminal device: cathode connects to system ground or regulated rail, anode sinks current to establish reference voltage at the cathode node. The TEST pin is internally connected and must not be externally wired; GND and VOUT pins define the reference output path.

Key Specifications

Pinout & Package

LT1634ACS8-4.096#TRPBF is housed in an 8-lead plastic SO (S8) package, 0.150-inch narrow body, RoHS-compliant lead-free finish. Pin 1 is marked by a bevel or dimple; leads are gull-wing, coplanarity ≤0.102mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1460ACS8-4.1#TRPBF and REF43FH4096IDR, the LT1634ACS8-4.096#TRPBF delivers the best balance of ultra-low 20µA operation, 0.05% accuracy, and SO-8 compatibility-making it the preferred choice for portable, battery-critical, and cost-sensitive precision reference applications.

Availability

LT1634ACS8-4.096#TRPBF is available at Aetrix Electronics and suitable for portable meters, precision regulators, and A/D converter reference circuits requiring stable component supply, long-term parametric consistency, and RoHS-compliant packaging.

Supply support for LT1634ACS8-4.096#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 acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for the LT1634 family. Linear Technology pioneered high-precision analog ICs with emphasis on performance, reliability, and ease of use.

The LT1634 series was designed specifically for micropower, high-accuracy shunt reference applications in portable instrumentation, industrial sensors, and data acquisition systems where minimal quiescent current and guaranteed drift specs are mandatory.

FAQ

What is the minimum operating current for LT1634ACS8-4.096#TRPBF?

The LT1634ACS8-4.096#TRPBF requires a minimum operating current of 20µA to maintain specified accuracy and regulation. Below this threshold, output voltage may deviate beyond the ±0.05% initial tolerance. This value is confirmed in the 4.096V Electrical Characteristics table under "Minimum Operating Current" with conditions IR = 20µA.

Can LT1634ACS8-4.096#TRPBF be used with capacitive loads?

Yes, the LT1634ACS8-4.096#TRPBF is stable with capacitive loads up to 0.1µF, as verified in Typical Performance Characteristics (Figure G08/G09). Unlike many shunt references, it does not require an output compensation capacitor and remains phase-stable when directly decoupled to ADC reference inputs or op-amp feedback nodes.

What is the function of Pin 8 (TEST) on LT1634ACS8-4.096#TRPBF?

Pin 8 (TEST) on the LT1634ACS8-4.096#TRPBF is internally connected and must not be wired to external circuitry. The datasheet explicitly states "Connected internally. Do Not Connect external circuitry to these pins." Leaving it unconnected or tying it to GND (Pin 4) is acceptable, but no functional benefit is gained from either connection.

Is LT1634ACS8-4.096#TRPBF compatible with the LM385-4.1?

The LT1634ACS8-4.096#TRPBF is a functional upgrade-not a pin-compatible replacement-for the LM385-4.1. While both are 4.1V-class shunt references in SO-8 packages, LT1634ACS8-4.096#TRPBF offers tighter 0.05% accuracy (vs. ±1%), lower 10ppm/°C drift (vs. 50ppm/°C), and 20µA operation (vs. 20µA min but typically higher). Layout reuse is possible, but bias network recalculations are recommended.

What temperature range does LT1634ACS8-4.096#TRPBF support?

The LT1634ACS8-4.096#TRPBF is rated for the commercial temperature range of 0°C to 70°C, as indicated by the "A" grade suffix and confirmed in the Order Information table. Its 10ppm/°C max drift and 0.05% initial accuracy are guaranteed across this full range-not just at 25°C-making it suitable for office and lab environments without extended thermal qualification.