Diodes Incorporated ZRC500A01STOB

Overview

ZRC500A01STOB from Diodes Incorporated is a precision 5.0 V bandgap voltage reference IC with ±1% initial tolerance, 30 ppm/°C typical temperature coefficient, and 0.4 Ω typical slope resistance. It operates from 25 µA to 5 mA, requires no external capacitor, and achieves stable regulation in <10 µs-ideal for low-power portable instrumentation and battery-powered metering systems.

For engineers reviewing the ZRC500A01STOB datasheet, ZRC500A01STOB pinout, ZRC500A01STOB application, or ZRC500A01STOB equivalent, key selection criteria include knee current (19 µA typ), load stability without output capacitance, transient response under 10 µs, TC performance across –40°C to +85°C, and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The ZRC500A01STOB implements a two-terminal shunt reference architecture with internal bandgap core, delivering fixed 5.0 V reverse breakdown voltage. Its low 19 µA typical minimum operating current and 0.4 Ω dynamic impedance enable stable regulation even under light-load and high-capacitive-load conditions.

It exhibits monotonic temperature drift (±30 ppm/°C typ) over –40°C to +85°C, maintains regulation up to 25 mA absolute max forward current, and withstands transient surges up to 200 mA due to rugged 20 V process design-making it suitable for noisy industrial supply rails.

Key Specifications

Pinout & Package

Package: SOT23-3 (suffix "F"), surface-mount, 3-pin small-outline transistor package with pin 1 floating or connected to pin 2 per datasheet revision.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDBVR and LM4040C50IDBZR, the ZRC500A01STOB uniquely balances ±1% tolerance, 19 µA knee current, and capacitor-free stability-making it optimal for space- and energy-constrained 5 V reference nodes where simplicity and efficiency are co-primary goals.

Availability

ZRC500A01STOB is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and industrial metering systems requiring stable component supply with guaranteed long-term continuity.

Supply support for ZRC500A01STOB 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 industrial, computing, and consumer markets.

The ZRC500 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, space-constrained applications demanding stable 5.0 V references without external compensation.

FAQ

What is the recommended external series resistor for ZRC500A01STOB at 12 V input?

At 12 V input, a 7 kΩ resistor delivers ~1 mA cathode current-well within the 25 µA to 5 mA operating range and near the 150 µA test condition for specified TC and VR. This value provides margin against worst-case 5.05 V output and 11.5 V min input while maintaining thermal stability and low dissipation in SOT23-3.

Can ZRC500A01STOB drive a 10 nF capacitive load directly?

Yes. The device is explicitly characterized as stable with any capacitive load and requires no external compensation. Datasheet transient response plots confirm stable settling under 10 µs with 10 nF loads at 5 mA step, making it suitable for direct connection to ADC sample-and-hold capacitors and digital isolator bias networks.

Does ZRC500A01STOB have built-in ESD protection?

The ZRC500A01STOB is fabricated on a 20 V rugged process and tested to withstand transient currents up to 200 mA, indicating inherent robustness against ESD-induced surges. However, the datasheet does not specify IEC 61000-4-2 rating or dedicated ESD clamp structures-external protection is advised for environments exceeding 2 kV HBM.

How does temperature coefficient vary between –40°C and +85°C for ZRC500A01STOB?

The typical average TC is 30 ppm/°C, measured as (VRₘₐₓ − VRₘᵢₙ) × 10⁶ / (VR × ΔT). Over –40°C to +85°C, VR remains within 4.95 V to 5.05 V (±1%), resulting in ≤1.5 mV total drift. The characteristic curve shows monotonic behavior with worst-case deviation at temperature extremes, not inflection points.