Analog Devices Inc. LT1634AIS8-5#TRPBF

Overview

LT1634AIS8-5#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, 10ppm/°C max temperature drift, and 15µA minimum operating current. It operates across –40°C to +85°C and serves as a high-accuracy reference in portable meters, precision regulators, and 12-bit DAC systems such as the LTC1448.

For engineers reviewing the LT1634AIS8-5#TRPBF datasheet, LT1634AIS8-5#TRPBF pinout, LT1634AIS8-5#TRPBF application, or LT1634AIS8-5#TRPBF equivalent, key selection criteria include guaranteed industrial-temperature performance, low dynamic impedance (<1.5Ω), sub-35µV_P-P 0.1Hz–10Hz noise, and compatibility with capacitive loads without external compensation.

Technical Context

The LT1634AIS8-5#TRPBF uses trimmed thin-film resistors and an improved curvature correction technique to achieve its 10ppm/°C max drift over –40°C to +85°C. Its bandgap-based shunt architecture functions like a Zener diode in parallel with a resistor, enabling simple biasing in adjustable reference circuits.

It requires no output compensation capacitor but remains stable with capacitive loads up to 0.1µF. The device's low 15µA minimum operating current and <1.5Ω dynamic impedance at 20µA–2mA support ultra-low-power, high-precision applications where supply headroom is constrained.

Key Specifications

Pinout & Package

LT1634AIS8-5#TRPBF is housed in an 8-lead plastic SO (Small Outline) package (S8), 0.150-inch width, RoHS-compliant, tape-and-reel format. Pin 1 is marked via bevel edge or dimple per JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1460ACS8-5#TRPBF and REF5050AIDR, the LT1634AIS8-5#TRPBF uniquely combines shunt topology, industrial temperature rating, micropower operation, and SO-8 compatibility - making it optimal for space-constrained, battery-operated, and floating-reference applications where headroom is limited.

Availability

LT1634AIS8-5#TRPBF is available at Aetrix Electronics and suitable for portable meters, precision regulators, and A/D and D/A converters requiring stable component supply, long-term calibration retention, and industrial-temperature reliability.

Supply support for LT1634AIS8-5#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 emphasis on high-performance, low-power, and robust industrial solutions.

The LT1634 family was designed specifically for micropower, high-accuracy shunt reference applications in portable instrumentation, sensor signal chains, and calibration equipment where minimal quiescent current and guaranteed temperature stability are mandatory.

FAQ

What is the guaranteed initial accuracy of the LT1634AIS8-5#TRPBF over its industrial temperature range?

The LT1634AIS8-5#TRPBF guarantees ±0.05% initial accuracy (±2.5mV at 5V) over the full –40°C to +85°C operating range, as confirmed in the "4.096V Electrical characteristics" and "5V Electrical characteristics" tables of the official datasheet. This specification applies at 20µA test current and is verified across all units in the A-grade bin.

Can the LT1634AIS8-5#TRPBF operate without an output capacitor?

Yes, the LT1634AIS8-5#TRPBF does not require an output compensation capacitor and remains stable with purely resistive loads. It is also stable with capacitive loads up to 0.1µF, as demonstrated in Figure 1634-5 G08 (20ms/div response with 0.1µF). This eliminates a common BOM item in space-constrained designs.

What is the minimum operating current required for the LT1634AIS8-5#TRPBF to maintain regulation?

The LT1634AIS8-5#TRPBF requires a minimum operating current of 15µA to maintain regulation within specifications, as stated in the "5V Electrical characteristics" table. Below this threshold, output voltage deviates nonlinearly and hysteresis increases significantly.

How does the LT1634AIS8-5#TRPBF compare to the LT1004 in terms of temperature drift and power consumption?

The LT1634AIS8-5#TRPBF improves upon the LT1004 with 10ppm/°C max drift (vs. 50–100ppm/°C for LT1004) and 15µA minimum current (vs. 45µA for LT1004). These enhancements enable higher accuracy in wide-temperature environments and extend battery life in portable applications using the LT1634AIS8-5#TRPBF.

Is the LT1634AIS8-5#TRPBF pin-compatible with other members of the LT1634 family in SO-8 packages?

Yes, all LT1634 variants in the S8 (SO-8) package - including LT1634ACS8-5#TRPBF, LT1634AIS8-5#TRPBF, and LT1634BCS8-5#TRPBF - share identical pinouts and footprints. Only the grade (A/B/C), temperature range (commercial/industrial), and output voltage (1.25V/2.5V/4.096V/5V) differ; PCB layout is fully reusable across these variants.