Diodes Incorporated ZRA124F01TC

Overview

ZRA124F01TC from Zetex Semiconductors is a precision micropower 1.24 V bandgap voltage reference IC in SOT23-3 package, operating from 50 µA to 5 mA with ±1% initial tolerance, 30 ppm/°C typical temperature coefficient, and no external capacitor required. It delivers stable output under capacitive loads and withstands transient currents up to 200 mA, making it ideal for battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZRA124F01TC datasheet, ZRA124F01TC pinout, ZRA124F01TC application, or ZRA124F01TC equivalent, key selection criteria include low-quiescent-current operation (50 µA min), tight initial tolerance (1%), TC performance (≤90 ppm/°C max), stability without external capacitance, and rugged transient handling (200 mA surge capability).

Technical Context

The ZRA124F01TC implements a two-terminal shunt voltage reference topology using a bandgap core, configured as a floating or cathode-connected device per top-view schematic. Its internal design eliminates need for external stabilization capacitance while maintaining stability with capacitive loads up to 1 µF.

It operates over −40°C to +85°C with guaranteed reverse breakdown voltage of 1.228–1.252 V at 150 µA, slope resistance ≤2 Ω (typ. 0.65 Ω), and wideband noise of 40 µV_rms (100 Hz–10 kHz). Transient response settles within <10 µs.

Key Specifications

Pinout & Package

Package: SOT23-3 (JEDEC TO-236AB), 2.67–3.05 mm × 1.20–1.40 mm × 1.10 mm height, 3-terminal surface-mount outline with pin 1 floating or connected to pin 2 per schematic.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and MAX6126AASA+, the ZRA124F01TC uniquely combines 1.24 V output, 50 µA minimum current, and capacitor-free stability-enabling smallest-footprint, longest-life shunt references in portable measurement hardware.

Availability

ZRA124F01TC is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and precision data acquisition systems requiring stable component supply with long-term lifecycle assurance.

Supply support for ZRA124F01TC 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

Zetex Semiconductors (now part of Diodes Incorporated) specialized in high-performance analog and discrete semiconductors, emphasizing precision, low power, and ruggedness for industrial and portable applications.

The ZRA124 series was designed specifically for micropower shunt voltage referencing in space- and energy-constrained systems such as handheld meters and remote sensors, prioritizing ultra-low I_Q, capacitor-free operation, and transient robustness.

FAQ

What is the maximum capacitive load the ZRA124F01TC can drive without oscillation?

The ZRA124F01TC is specified as stable with any capacitive load-including zero external capacitance-and remains stable up to at least 1 µF, per manufacturer characterization. This eliminates need for series resistance or external compensation networks in layout, simplifying design for compact PCBs in portable instruments.

Can Pin 1 be left unconnected in standard shunt reference configuration?

Yes-Pin 1 (Anode) may be left floating in basic two-terminal shunt mode, where current enters via Pin 2 (Cathode) and exits through the external resistor to supply rail. Floating Pin 1 maintains full specification compliance and is the default configuration shown in application schematics.

How does the ZRA124F01TC behave under reverse-bias conditions?

The ZRA124F01TC is a shunt reference and is not rated for reverse-bias operation. Absolute maximum rating specifies only forward (reverse breakdown) current up to 25 mA; applying reverse voltage (>0.3 V) risks permanent damage due to lack of protection diodes in the bandgap core structure.

Is the 1.24 V output trimmed at wafer or package level?

The 1.24 V output is laser-trimmed at wafer level to achieve ±1% initial tolerance, as confirmed by electrical test data showing 1.228–1.252 V distribution at 150 µA. No post-package trimming is performed, ensuring consistent performance across reel quantities without lot-to-lot calibration variance.