Analog Devices Inc. LT1634BIS8-5#TRPBF

Overview

LT1634BIS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower precision shunt voltage reference delivering a stable 5.000V output with ±0.05% initial accuracy, 25ppm/°C max temperature coefficient, and 0.75Ω typical dynamic impedance across –40°C to +85°C. It operates down to 15µA and supports capacitive loads without external compensation-ideal for battery-powered portable meters and high-resolution A/D converters requiring low-drift, low-noise references.

For engineers reviewing the LT1634BIS8-5#TRPBF datasheet, LT1634BIS8-5#TRPBF pinout, LT1634BIS8-5#TRPBF application, or LT1634BIS8-5#TRPBF equivalent, key selection criteria include industrial-temperature operation, guaranteed 25ppm/°C drift, reverse breakdown stability under 20µA–20mA load current, low-frequency noise of 35µV_P-P, and SO-8 package compatibility with standard PCB layouts.

Technical Context

The LT1634BIS8-5#TRPBF uses trimmed thin-film resistors and an improved curvature correction technique to achieve its 0.05% initial accuracy and 25ppm/°C max drift over –40°C to +85°C. Its bandgap-based shunt architecture functions as a two-terminal device, sinking current to regulate voltage at the cathode node relative to ground.

It requires no output capacitor for stability but remains robust with up to 0.1µF capacitance. The device exhibits low hysteresis (160ppm over full temperature cycle) and maintains <0.75Ω dynamic impedance from 20µA to 2mA operating current-enabling precise regulation in unregulated supply environments.

Key Specifications

Pinout & Package

LT1634BIS8-5#TRPBF is housed in an 8-lead plastic SO (S8) package with exposed pad not connected. Pin 4 is GND; Pin 5 is V_OUT (cathode); Pins 1–3 and 6–8 are DNC (internally connected or not connected). The TEST pin (Pin 5 in MS8, Pin 5 in S8 per documentation) is labeled V_OUT and functions as the reference output terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1634BIS8-5#TRPBF, LT1460BCS8-5#TRPBF offers tighter drift but demands higher supply voltage and current, while REF5050AIDR delivers superior stability at significantly higher quiescent power-making LT1634BIS8-5#TRPBF optimal for space-constrained, battery-operated industrial instruments needing balanced accuracy, drift, and efficiency.

Availability

LT1634BIS8-5#TRPBF is available at Aetrix Electronics and suitable for portable meters, precision regulators, and A/D and D/A converters requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LT1634BIS8-5#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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, including voltage references, op amps, and data converters, with focus on high-performance industrial and instrumentation markets.

The LT1634 family was designed specifically for micropower, high-accuracy shunt reference applications where low drift, low noise, and minimal operating current are essential-targeting portable test equipment, sensor interfaces, and calibration systems.

FAQ

What is the minimum operating current for LT1634BIS8-5#TRPBF?

The LT1634BIS8-5#TRPBF requires a minimum operating current of 15µA to maintain regulation within specifications. Below this threshold, output voltage may deviate beyond the ±0.05% initial accuracy band. This value is confirmed in the 5V Electrical Characteristics table under "Minimum Operating Current" for LT1634BIS8-5#TRPBF at IR = 20µA, with full-range specification denoted by the "l" symbol indicating applicability over –40°C to +85°C.

Does LT1634BIS8-5#TRPBF require an output capacitor?

No, the LT1634BIS8-5#TRPBF does not require an output capacitor for stability and is explicitly characterized as stable with 0µF to 0.1µF capacitive loads. This eliminates BOM cost and layout complexity in space-constrained designs. However, a 0.1µF ceramic capacitor is recommended when driving noisy digital loads to suppress high-frequency coupling into the reference node.

What is the temperature coefficient of LT1634BIS8-5#TRPBF over its full operating range?

The LT1634BIS8-5#TRPBF has a maximum temperature coefficient of 25ppm/°C over the full industrial temperature range of –40°C to +85°C. This value is specified in the "Temperature Coefficient (Note 8)" row of the 5V Electrical Characteristics table for LT1634B/LT1634C devices at IR = 20µA, and applies across the entire operating temperature range as indicated by the "l" symbol.

Can LT1634BIS8-5#TRPBF be used in place of LM385-5.0?

Yes, the LT1634BIS8-5#TRPBF serves as a high-performance upgrade to the LM385-5.0, offering superior specs: 0.05% vs. 1% initial accuracy, 25ppm/°C vs. 50ppm/°C max drift, 15µA vs. 20µA min operating current, and 0.75Ω vs. ~5Ω dynamic impedance. Pin compatibility is maintained in SO-8 packages, but layout review is advised due to differences in thermal dissipation and noise sensitivity.

What is the reverse dynamic impedance of LT1634BIS8-5#TRPBF at 20µA?

The reverse dynamic impedance of LT1634BIS8-5#TRPBF is 0.75Ω typical (≤1.50Ω maximum) at 20µA operating current, as specified in the "Reverse Dynamic Impedance (Note 5)" row of the 5V Electrical Characteristics table. This low impedance ensures minimal voltage variation under changing load conditions, critical for high-precision analog measurement systems.