Diodes Incorporated ZXRE125FN8TA

Overview

ZXRE125FN8TA from Diodes Incorporated is a micropower bandgap voltage reference IC delivering a precise 1.220 V output with ±3% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 4 µA to 20 mA supply current - used in battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZXRE125FN8TA datasheet, ZXRE125FN8TA pinout, ZXRE125FN8TA application, or ZXRE125FN8TA equivalent, key selection factors include its SOT23-3 package compatibility, unconditional stability with capacitive loads, low knee current (4 µA), and tolerance-grade availability (C/D/E/F) for precision analog signal conditioning and low-power ADC/DAC biasing.

Technical Context

The ZXRE125FN8TA implements a two-terminal shunt-mode bandgap reference architecture, operating as a precision 1.22 V reverse-breakdown device requiring external current limiting. It functions across an ultra-low 4 µA minimum operating current up to 20 mA, maintaining regulation without external compensation.

Its design achieves unconditional stability with load capacitance up to 10 nF, eliminates need for series resistance in most configurations, and delivers 60 µV_rms wideband noise (10 Hz–10 kHz) at 8–100 µA bias - critical for high-resolution measurement front-ends.

Key Specifications

Pinout & Package

SOT23-3 surface-mount package (3.04 mm × 2.64 mm × 1.12 mm), JEDEC MO-178AA compliant, with gull-wing leads and green molding compound (Br/Sb-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431AIDBZR and LM4040CIM3-ADJ, ZXRE125FN8TA offers lower knee current (4 µA vs ≥60 µA), tighter TC (20 ppm/°C vs ≥100 ppm/°C), and lower noise - making it optimal for battery-critical, high-accuracy, fixed-voltage reference roles where minimal external components are essential.

Availability

ZXRE125FN8TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable communication devices, and precision data acquisition systems requiring stable component supply with guaranteed long-term sourcing.

Supply support for ZXRE125FN8TA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, energy-efficient components for industrial, computing, and consumer markets.

The ZXRE125 belongs to Diodes' precision voltage reference product line, engineered specifically for ultra-low-power, space-constrained analog systems where shunt-mode stability and tight temperature drift are mandatory.

FAQ

What is the recommended external current-limiting resistor value for ZXRE125FN8TA at 3.3 V supply?

At 3.3 V supply, a 1.5 kΩ resistor delivers ~1.38 mA bias current - well within the 4 µA–20 mA operating range and ensuring stable regulation with margin for load variations. This value avoids thermal stress while maintaining low-noise performance per datasheet Figure 5.

Can ZXRE125FN8TA replace ZRA125 in existing designs?

Yes - ZXRE125FN8TA is explicitly designed as a pin-for-pin SOT23-3 replacement for ZRA125 series devices, sharing identical pinout, electrical envelope, and tolerance grades. No layout or schematic changes are required for drop-in substitution.

Does ZXRE125FN8TA require output capacitance for stability?

No external capacitance is required for stability - the device is unconditionally stable up to 10 nF load capacitance. However, a 100 nF ceramic capacitor placed directly at Pin 2 improves high-frequency PSRR and reduces broadband noise coupling in sensitive measurement paths.

What is the maximum power dissipation limit at 85°C ambient?

At 85°C ambient, the ZXRE125FN8TA's maximum power dissipation is derated to 220 mW based on its 330 mW rating at 25°C and thermal resistance θ_JA ≈ 350°C/W. This corresponds to ≤180 mA at 1.22 V - but practical max current remains 20 mA per absolute ratings table.