Diodes Incorporated ZXRE125DFTA

Overview

ZXRE125DFTA from Diodes Incorporated is a precision micropower bandgap voltage reference delivering 1.220 V ±1% over −40°C to +85°C, with 20 ppm/°C typical temperature coefficient and 4 µA knee current. It operates from 8 µA to 20 mA supply current, maintains unconditional stability with capacitive loads, and targets low-power analog signal conditioning in portable instrumentation.

For engineers reviewing the ZXRE125DFTA datasheet, ZXRE125DFTA pinout, ZXRE125DFTA application, or ZXRE125DFTA equivalent, key selection criteria include output tolerance (±1%), ultra-low operating current capability, SOT23-3 package footprint, thermal drift performance, and compatibility with battery-powered data acquisition systems requiring stable 1.22 V biasing.

Technical Context

The ZXRE125DFTA implements a two-terminal shunt-mode bandgap reference architecture, configured as a precision Zener-replacement device with reverse breakdown operation. Its internal circuitry achieves tight initial accuracy and low thermal hysteresis through curvature-compensated bandgap design and laser-trimmed resistive elements.

It functions as a two-terminal device where cathode (Pin 1) and anode (Pin 2) define the reference node, and Pin 3 is internally floating or optionally tied to Pin 1 per layout guidance. Stability is maintained up to 1 µF capacitive load without external compensation, enabling direct use in ADC reference buffers and sensor excitation circuits.

Key Specifications

Pinout & Package

SOT23-3 surface-mount package (JEDEC TO-236AB), 2.80 × 2.64 × 1.12 mm body, gull-wing leads, 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 MAX6012AEUR+T, the ZXRE125DFTA uniquely balances sub-5 µA startup capability, ±1% factory trim, and SOT23-3 footprint-making it optimal for space-constrained, multi-year battery applications where 1.22 V exactness matters more than sub-0.5% tolerance.

Availability

ZXRE125DFTA is available at Aetrix Electronics and suitable for battery voltage monitoring, precision ADC reference, portable sensor signal chain, and low-power RTD excitation requiring stable component supply across industrial and medical OEM programs.

Supply support for ZXRE125DFTA 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, cost-optimized components for power management, signal integrity, and protection applications.

The ZXRE125 series belongs to Diodes' precision voltage reference product line, engineered specifically for ultra-low-power, space-sensitive applications where traditional three-terminal references are impractical.

FAQ

What is the recommended external resistor value for ZXRE125DFTA when biased from a 3.3 V supply?

For stable operation at 10 mA cathode current, use a 207 Ω resistor (3.3 V − 1.22 V) / 0.01 A = 208 Ω; standard 1% E96 value 205 Ω yields 10.24 mA. Ensure power rating ≥21 mW (derated to 12.6 mW at 70°C ambient) using 0402 or larger chip resistor.

Can ZXRE125DFTA replace ZRA125 in existing designs?

Yes-ZXRE125DFTA is explicitly designed as a pin-for-pin SOT23-3 replacement for ZRA125 series. Both share identical pinout (cathode/anode/NC), 1.22 V nominal output, and ±1% tolerance grade. No layout or bill-of-material changes are required for drop-in substitution.

Does ZXRE125DFTA require output capacitance for stability?

No-ZXRE125DFTA is unconditionally stable with capacitive loads up to 1 µF. Adding 100 nF ceramic capacitor improves PSRR by 20 dB above 10 kHz but is not required for basic stability. Avoid electrolytic or tantalum caps due to ESR-related phase shift risks.

How does temperature coefficient affect accuracy in a −25°C to +75°C operating range?

With 20 ppm/°C typical TC, total drift is 20 × 100 = 2000 ppm (0.2%) over 100°C span. At 1.220 V nominal, this equals ±2.44 mV maximum deviation. Combined with ±1% initial tolerance, worst-case total error is ±1.2% - sufficient for 10-bit systems without calibration.