Texas Instruments LM285Z-2.5/NOPB

Overview

LM285Z-2.5/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance, 0.6 Ω dynamic impedance (A grade), and operation across 20 μA–20 mA supply current. It serves as a stable reference in portable meters, battery-powered analog circuitry, and precision current sources where low power and temperature stability are critical.

For engineers reviewing the LM285Z-2.5/NOPB datasheet, LM285Z-2.5/NOPB pinout, LM285Z-2.5/NOPB application, or LM285Z-2.5/NOPB equivalent, key selection factors include its TO-92 package, −40°C to +85°C operating range, 50 ppm/°C max temperature coefficient (Y suffix), and compatibility with capacitive loading up to 10 μF without instability.

Technical Context

The LM285Z-2.5/NOPB uses a band-gap core with on-chip trimming for tight voltage accuracy and achieves low noise (120 μV rms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm over 1000 hours). Its two-terminal architecture simplifies design by eliminating separate input/output pins-current flows through the device to set operating point and regulate output voltage.

It features exceptionally low dynamic impedance (0.6 Ω at 100 μA, f = 20 Hz) and wide operating current range (20 μA to 20 mA), enabling use in both ultra-low-power standby circuits and higher-current reference applications without external components. The device is rated for industrial temperature range and exhibits robust tolerance to capacitive loading.

Key Specifications

Pinout & Package

LM285Z-2.5/NOPB is housed in a 3-pin TO-92 plastic package (JEDEC TO-226, package drawing LP0003A), with leads formed for through-hole mounting. Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is internally connected to the die attach pad and may be left floating or tied to Pin 2 per TI recommendation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM285BXZ-2.5/NOPB, the LM285Z-2.5/NOPB trades initial accuracy for cost and broad compatibility with legacy shunt-reference designs; versus REF3025AIDBZR, it eliminates supply dependency and simplifies layout but requires current-source biasing.

Availability

LM285Z-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial analog signal conditioning requiring stable component supply with full traceability and RoHS/Green compliance.

Supply support for LM285Z-2.5/NOPB 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision voltage references and power management ICs.

The LM285 series belongs to TI's micropower shunt reference product line, designed specifically for battery-operated and low-power analog systems demanding high accuracy, low drift, and minimal quiescent current.

FAQ

What is the maximum reverse current rating for LM285Z-2.5/NOPB?

The absolute maximum reverse current for LM285Z-2.5/NOPB is 30 mA. Exceeding this value risks permanent damage. In normal operation, the device is biased with forward current (anode-to-cathode), and the recommended operating current range is 20 μA to 20 mA. The 30 mA limit applies only under fault or transient conditions and must not be sustained.

Can LM285Z-2.5/NOPB be used with large output capacitors?

Yes, LM285Z-2.5/NOPB is explicitly designed for exceptional capacitive loading tolerance - it remains stable with ≥10 μF ceramic or tantalum capacitors directly across its terminals. This eliminates the need for series isolation resistors in battery-monitoring and sensor-biasing applications, simplifying layout and improving transient response.

What does the "Z" suffix indicate in LM285Z-2.5/NOPB?

The "Z" suffix in LM285Z-2.5/NOPB denotes the TO-92 molded plastic package (JEDEC TO-226, TI package drawing LP0003A). It distinguishes this variant from SOIC (M), SOT-23 (M3), or hermetic TO (H) versions. The "Z" package has 3 leads, is RoHS-compliant, and operates from −40°C to +85°C.

How does LM285Z-2.5/NOPB achieve low temperature drift?

LM285Z-2.5/NOPB achieves low temperature drift via a band-gap reference core with curvature correction and on-chip laser trimming. Its Y-suffix version specifies ≤50 ppm/°C average temperature coefficient over −40°C to +85°C, translating to ≤125 μV total drift - verified across seven temperature points including extremes.

Is LM285Z-2.5/NOPB pin-compatible with LM385Z-2.5/NOPB?

No, LM285Z-2.5/NOPB and LM385Z-2.5/NOPB share the same TO-92 package and pinout (Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = DAP), but they differ in temperature range (−40°C to +85°C vs. 0°C to +70°C) and electrical specifications - LM385Z-2.5/NOPB has looser initial tolerance (±50 mV) and higher tempco (150 ppm/°C). Interchange requires validation against system-level accuracy requirements.