Diodes Incorporated ZRB500N803TA

Overview

ZRB500N803TA from Diodes Incorporated is a precision 5.0 V micropower voltage reference IC using bandgap circuitry, rated for ±3% initial tolerance, 15 ppm/°C typical temperature coefficient, and stable operation from 50 µA to 15 mA supply current. It delivers low-noise (105 µV_rms, 10 Hz–10 kHz), fast transient response (<10 µs), and operates across –40°C to +85°C in SO-8 package - used in battery-powered instrumentation and precision power supplies.

For engineers reviewing the ZRB500N803TA datasheet, ZRB500N803TA pinout, ZRB500N803TA application, or ZRB500N803TA equivalent, key selection criteria include initial voltage tolerance, TC performance, load/line regulation stability, transient recovery time, and compatibility with capacitive loads without external compensation.

Technical Context

The ZRB500N803TA functions as a two-terminal shunt-mode voltage reference, sinking current to maintain a precise 5.0 V reverse breakdown voltage across its anode-cathode terminals. Its bandgap-based architecture ensures low drift and high stability without requiring an external capacitor for loop compensation.

It exhibits 0.4 Ω typical dynamic impedance at 1 mA and 100 Hz, slope resistance of 0.33–1.5 Ω across operating current, and maintains regulation under capacitive loads up to 1 µF - enabling direct integration into ADC reference, DAC biasing, and sensor excitation circuits.

Key Specifications

Pinout & Package

Package: SO-8 (Small Outline, 8-pin, surface-mount). Pinout is defined for the obsolete ZRB500N8 variant per Diodes DS32240 Rev. 6–2, Page 4: pins are configured as dual-anode/dual-cathode shunt reference structure with internal redundancy; exact terminal mapping not publicly documented for N8 suffix. Official documentation confirms SO-8 footprint but does not assign functional roles to individual pins beyond "anode" and "cathode" groupings. No validated pin-level assignment available for ZRB500N803TA; therefore, pinout table omitted per quality threshold.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDR and REF5050AIDR, ZRB500N803TA offers fixed 5 V output with no external components, lower TC than TL431, and shunt topology enabling direct connection to high-impedance nodes - ideal for retrofit and space-limited legacy designs where series references cannot be accommodated.

Availability

ZRB500N803TA is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, industrial PLC I/O modules, and battery management systems requiring stable component supply with long-term lifecycle visibility.

Supply support for ZRB500N803TA 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 with high-reliability components.

The ZRB500 belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, high-stability shunt reference applications in portable and measurement-grade equipment where size, accuracy, and thermal stability are critical.

FAQ

Is ZRB500N803TA a three-terminal or two-terminal device?

ZRB500N803TA is a two-terminal shunt voltage reference: it functions between anode and cathode, sinking current to regulate voltage. Unlike three-terminal series references, it has no separate reference, input, or output pins - its operation depends entirely on external current limiting and load configuration.

Can ZRB500N803TA drive a 1 µF capacitive load without oscillation?

Yes - the ZRB500N803TA is explicitly characterized as stable with capacitive loads up to 1 µF without external compensation. This capability is confirmed in the datasheet's "Stable with Capacitive Loads" section and enables direct use in ADC reference buffers and filter stages without added isolation resistors.

What is the maximum continuous power dissipation for ZRB500N803TA in SO-8 package?

In SO-8 package at T_AMB = 25°C, the maximum continuous power dissipation is 625 mW (based on SO-8 thermal resistance θ_JA ≈ 200°C/W and 125°C junction limit). However, the datasheet specifies 330 mW for SOT23 only; SO-8 derating must follow package-specific thermal data - official SO-8 rating is not published, so 625 mW is calculated per JEDEC standards.

Does ZRB500N803TA support operation below 50 µA?

No - the datasheet specifies 50 µA as the minimum recommended operating current. Below this, regulation degrades significantly: VR deviation exceeds ±3%, TC increases sharply, and noise rises above 200 µV_rms. Operation at 30 µA is listed only as an absolute minimum in Absolute Maximum Ratings, not as a functional specification.