Diodes Incorporated ZRC500F03TA

Overview

ZRC500F03TA 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, designed for low-power, battery-operated instrumentation and portable measurement systems.

For engineers reviewing the ZRC500F03TA datasheet, ZRC500F03TA pinout, ZRC500F03TA application, or ZRC500F03TA equivalent, key selection criteria include knee current (19 µA typ), transient stability (<10 µs), capacitor-free operation, and SOT23-3 package compatibility in space-constrained analog signal chains.

Technical Context

The ZRC500F03TA implements a bandgap-based reverse-biased Zener topology optimized for micropower operation, delivering stable 5.0 V output without external compensation. Its low 19 µA minimum operating current and 0.4 Ω dynamic impedance enable high-accuracy sensing in ultra-low-current bias networks.

It maintains regulation across –40°C to +85°C with 30 ppm/°C typical TC and supports capacitive loads up to 10 nF while remaining stable. Transient response settles within 10 µs under step-load conditions, making it suitable for fast-sampling ADC references and portable power monitoring.

Key Specifications

Pinout & Package

Supplied in SOT23-3 package (JEDEC TO-236AB), with 1.3 mm × 2.9 mm footprint and 1.1 mm height. Pin 1 is floating or tied to GND per application layout; Pin 2 is GND; Pin 3 is VR (output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431AIDBZR and REF5050AIDR, the ZRC500F03TA uniquely balances ±1% accuracy, SOT23-3 size, capacitor-free operation, and sub-20 µA knee current-making it optimal for compact, battery-sensitive instrumentation where moderate TC is acceptable.

Availability

ZRC500F03TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and industrial metering systems requiring stable component supply with consistent parametric performance across production lots.

Supply support for ZRC500F03TA 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 analog reference product line, engineered specifically for low-power, space-constrained applications where micropower operation and robust thermal stability are essential.

FAQ

What is the maximum capacitive load the ZRC500F03TA can drive without instability?

The ZRC500F03TA is specified stable with capacitive loads up to 10 nF, as confirmed in the datasheet's Typical Characteristics section. This eliminates need for series isolation resistors in most ADC reference applications, though layout best practices (short traces, local decoupling) remain essential for noise control.

Can ZRC500F03TA operate reliably below 25 µA?

Yes - the device achieves stable regulation starting at 19 µA (typical knee current), and functions down to 15 µA with minor voltage deviation. Operation below 15 µA risks loss of regulation; design margin should maintain ≥20 µA minimum under worst-case temperature and tolerance conditions.

Is Pin 1 of the SOT23 package electrically connected internally?

No - Pin 1 is internally unconnected (NC) in the ZRC500F03TA. The datasheet explicitly states it may be left floating or tied to GND to improve noise immunity. It must never be driven with voltage or current, as no internal bond exists.

How does the ZRC500F03TA's 30 ppm/°C TC compare to its ±1% initial tolerance in system-level accuracy?

Over the full –40°C to +85°C range, the 30 ppm/°C TC contributes ±3.75 mV (±0.075%) drift, which is less than half the ±50 mV (±1%) initial tolerance. Thus, initial calibration dominates total error budget; temperature drift remains secondary unless operating beyond 85°C or requiring long-term drift stability.