Diodes Incorporated ZXRE125DN8TA

Overview

ZXRE125DN8TA from Diodes Incorporated is a micropower bandgap voltage reference IC delivering a precise 1.220 V output with ±1% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 4 µA to 20 mA supply current - used in precision analog signal chains of portable instrumentation and battery-powered data acquisition systems.

For engineers reviewing the ZXRE125DN8TA datasheet, ZXRE125DN8TA pinout, ZXRE125DN8TA application, or ZXRE125DN8TA equivalent, key selection criteria include low knee current (4 µA), unconditionally stable performance with capacitive loads, SOT23-3 package compatibility, and tight thermal drift specification for low-power precision referencing.

Technical Context

The ZXRE125DN8TA implements a two-terminal bandgap reference topology operating as a shunt regulator, requiring an external current source and load resistor. It achieves regulation by maintaining a fixed reverse breakdown voltage across its anode–cathode terminals, independent of supply variations above the knee voltage.

Its design emphasizes ultra-low power operation: minimum operating current is 4 µA, dynamic impedance is just 0.2 Ω at 1 mA, and wideband noise is 60 µV(rms) over 10 Hz–10 kHz - enabling high-resolution ADC biasing and sensor excitation in energy-constrained systems.

Key Specifications

Pinout & Package

Package: SOT23-3 (JEDEC TO-236AB), 2.80 × 2.10 × 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 TLVH431ACDBVR and MAX6008AEUR+T, the ZXRE125DN8TA offers superior thermal stability and true SOT23-3 pin compatibility for drop-in replacement of legacy ZRA-series references, while maintaining the lowest knee current among fixed 1.22 V shunt references in production.

Availability

ZXRE125DN8TA is available at Aetrix Electronics and suitable for battery-powered data loggers, portable multimeters, and wireless sensor nodes requiring stable component supply with guaranteed long-term continuity.

Supply support for ZXRE125DN8TA 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, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets since 1959.

The ZXRE125 belongs to Diodes' precision analog reference product line, engineered specifically for low-power, high-accuracy voltage referencing in portable and battery-operated instrumentation where size, stability, and micropower operation are critical.

FAQ

What is the minimum operating current for reliable regulation?

The ZXRE125DN8TA achieves stable regulation at a minimum cathode current of 4 µA, verified across –40°C to +85°C. Below this threshold, output voltage deviates nonlinearly; design must ensure external current source delivers ≥4 µA under worst-case low-V_CC and high-temp conditions.

Can it drive a 10 nF capacitor directly without oscillation?

Yes - the device is unconditionally stable per datasheet characterization, meaning no series resistance or external compensation is needed even with ≥10 nF capacitive loads. This has been validated in typical application circuits driving ADC input sampling capacitors and op-amp feedback networks.

Is ZXRE125DN8TA pin-compatible with ZRA125 series devices?

Yes - ZXRE125DN8TA is explicitly designed as a pin-for-pin SOT23-3 replacement for ZRA125 series references. Pin 1 (anode), Pin 2 (cathode), and Pin 3 (NC/anode tie) match identical physical and electrical mapping, enabling direct board-level substitution without layout changes.

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

At T_AMB = 85°C, maximum power dissipation is derated to 165 mW based on the 330 mW rating at 25°C and thermal resistance θ_JA ≈ 150°C/W. This limits safe continuous operation to ≤135 mA at 1.22 V - well above the 20 mA max specified operating current.