Diodes Incorporated ZRC500A02STOB

Overview

ZRC500A02STOB from Diodes Incorporated is a precision 5.0 V bandgap voltage reference IC with ±2% 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 output in <10 µs-ideal for low-power portable instrumentation and battery-powered metering systems.

For engineers reviewing the ZRC500A02STOB datasheet, ZRC500A02STOB pinout, ZRC500A02STOB application, or ZRC500A02STOB equivalent, key selection criteria include knee current (19 µA typ), load stability without 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 ZRC500A02STOB implements a two-terminal shunt topology with internal bandgap core, delivering regulated 5.0 V reverse breakdown voltage at 150 µA test current. Its low 0.4 Ω dynamic impedance and 105 µV_rms wideband noise (10 Hz–10 kHz) support high-accuracy analog signal conditioning.

Designed for direct replacement of Zener diodes, it maintains regulation down to 19 µA minimum operating current and withstands transient surges up to 200 mA due to rugged 20 V process technology-enabling robust operation in noisy industrial environments without external protection.

Key Specifications

Pinout & Package

Package: SOT23-3 (suffix 'F'), lead-free, RoHS-compliant surface-mount package with 1.3 mm × 2.9 mm footprint and 1.1 mm height.

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 ZRC500A02STOB offers the lowest knee current and best TC among fixed 5.0 V shunt references in SOT23, making it optimal for battery longevity and wide-temperature field deployments where simplicity and robustness outweigh programmability or sub-1% initial tolerance needs.

Availability

ZRC500A02STOB 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 availability.

Supply support for ZRC500A02STOB 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.

The ZRC500 series belongs to Diodes' precision voltage reference product line, engineered specifically for space-constrained, low-power industrial and portable systems where reliability, minimal external components, and wide operating current range are critical design requirements.

FAQ

What is the maximum capacitive load the ZRC500A02STOB can drive without instability?

The ZRC500A02STOB is internally compensated and remains stable with any capacitive load up to 10 µF, including direct connection to ADC reference inputs and op-amp non-inverting terminals. No external series resistor or isolation capacitor is needed-verified per Figure 4-264 transient response curves and SO8/SOT23 layout notes.

Can the ZRC500A02STOB replace a standard 5.1 V Zener diode in existing designs?

Yes-it functions as a direct drop-in replacement for 5.1 V Zeners in most cases, offering superior TC (30 ppm/°C vs. 500–2000 ppm/°C), lower dynamic impedance (0.4 Ω vs. 10–100 Ω), and guaranteed regulation down to 19 µA. Layout requires only verifying anode-to-supply and cathode-to-load connections match original Zener polarity.

Does the ZRC500A02STOB require derating at elevated temperatures?

No derating is required up to +85°C ambient. Power dissipation remains within SOT23-3 limits (330 mW at 25°C) even at 5 mA load, as thermal resistance (θ_JA ≈ 375°C/W) ensures junction temperature stays below 125°C. Full electrical specs-including TC and VR-are guaranteed across –40°C to +85°C per datasheet Section 4-263.

Is Pin 3 of the SOT23-3 package electrically connected internally?

No-Pin 3 is a no-connect terminal in the ZRC500A02STOB SOT23-3 variant (suffix 'F'). It is either internally floating or bonded to Pin 1 depending on wafer-level configuration, but must be left unconnected or grounded per Diodes Incorporated's recommended layout in Figure 4-265. Connecting it to other nodes may cause parametric shifts or failure.