Analog Devices Inc. LT1034BIZ-2.5#TRPBF

Overview

LT1034BIZ-2.5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower dual-output precision voltage reference IC providing a 2.5V bandgap reference and a 7V subsurface zener reference in a 3-lead TO-92 plastic package. It delivers 20 ppm/°C max temperature coefficient, 1.0 mV max reverse breakdown change over 30µA–2mA, 1.5Ω max dynamic impedance, and operates down to 30µA supply current. It serves as a high-stability reference in portable meters and precision regulators.

For engineers reviewing the LT1034BIZ-2.5#TRPBF datasheet, LT1034BIZ-2.5#TRPBF pinout, LT1034BIZ-2.5#TRPBF application, or LT1034BIZ-2.5#TRPBF equivalent, key selection criteria include guaranteed 20 ppm/°C drift over –40°C to 85°C, low 30µA minimum operating current, dual-reference architecture, TO-92 thermal resistance (θ_JA = 160°C/W), and compatibility with LM385/LT1004 upgrade paths.

Technical Context

The LT1034BIZ-2.5#TRPBF integrates two independent references on one die: a trimmed thin-film bandgap structure for the 2.5V output and a subsurface zener for the 7V output. Its bandgap reference uses curvature compensation to achieve 20 ppm/°C max drift across the industrial temperature range (–40°C to +85°C).

It operates in reverse-bias mode only; forward biasing either junction disrupts the other's regulation. The 2.5V reference is specified for 30µA–2mA operation, while the 7V reference is rated at 100µA nominal, with dynamic impedance of ≤1.5Ω at 100µA - enabling stable performance from unregulated supplies without external buffering.

Key Specifications

Pinout & Package

LT1034BIZ-2.5#TRPBF is housed in a 3-lead TO-92 plastic package (Z package), with leads designated as Cathode (2.5V), Anode (GND), and Cathode (7V). Thermal resistance is θ_JA = 160°C/W, suitable for ambient-limited industrial applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1004CZ-2.5 and LT1236ACS8-2.5, the LT1034BIZ-2.5#TRPBF uniquely balances ultra-low power (30 µA), dual-reference architecture, and industrial-grade 20 ppm/°C drift in a through-hole TO-92 package - making it optimal for portable, battery-constrained, multi-rail calibration systems where layout simplicity and long-term stability are prioritized over sub-ppm accuracy.

Availability

LT1034BIZ-2.5#TRPBF is available at Aetrix Electronics and suitable for portable digital multimeters, precision voltage regulators, and field calibration tools requiring stable component supply, long-lifecycle support, and industrial temperature grade performance.

Supply support for LT1034BIZ-2.5#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, amplifiers, and power management ICs, with emphasis on high-reliability industrial and instrumentation applications.

The LT1034 series was designed specifically for micropower, dual-output precision reference applications in portable test equipment and battery-powered calibration systems - prioritizing low drift, low quiescent current, and robustness across extended temperature ranges.

FAQ

What is the operating temperature range for the LT1034BIZ-2.5#TRPBF?

The LT1034BIZ-2.5#TRPBF is rated for the industrial temperature range of –40°C to +85°C. This is confirmed by its "I" grade designation in the part number and verified in the Electrical Characteristics table, where parameters like temperature coefficient and reverse breakdown voltage are guaranteed over this full range. The "B" prefix indicates improved initial tolerance and drift performance within that range.

Can the 7V and 2.5V outputs of the LT1034BIZ-2.5#TRPBF be used simultaneously?

Yes - the LT1034BIZ-2.5#TRPBF integrates two physically independent reference elements sharing only the anode (Lead 2). The 2.5V bandgap and 7V subsurface zener operate concurrently without interaction, provided each is reverse-biased correctly and load currents remain within specified limits (≤2mA for 2.5V, ≤20mA for 7V). Forward biasing either junction disrupts regulation of both.

Is the LT1034BIZ-2.5#TRPBF pin-compatible with the LT1004CZ-2.5?

No - although both use the TO-92 package and share anode/cathode topology, the LT1034BIZ-2.5#TRPBF has three functional terminals (2.5V cathode, anode/GND, 7V cathode), whereas the LT1004CZ-2.5 has only two (cathode, anode). Using LT1004CZ-2.5 in place of LT1034BIZ-2.5#TRPBF would leave the 7V output unimplemented and require PCB redesign to accommodate the missing third lead function.

What is the minimum current required for stable regulation of the 2.5V output in the LT1034BIZ-2.5#TRPBF?

The LT1034BIZ-2.5#TRPBF requires a minimum reverse current of 30 µA for guaranteed 2.5V regulation performance, including drift and dynamic impedance specs. This value is explicitly stated in the Electrical Characteristics table under "Minimum Operating Current" for the LT1034B grade. Operation below 30 µA may result in increased drift or output deviation beyond datasheet limits.

Does the LT1034BIZ-2.5#TRPBF require an output capacitor for stability?

No - the LT1034BIZ-2.5#TRPBF does not require an output capacitor for basic DC stability due to its inherently low dynamic impedance (≤1.5 Ω) and resistive output characteristic. However, a small ceramic capacitor (e.g., 100 nF) is recommended at the 2.5V output to suppress high-frequency noise coupling in sensitive measurement circuits, as noted in typical application schematics in the datasheet.