ADR433ARZ

Overview

The ADR433ARZ is a precision series voltage reference from the XFET family, providing a fixed 3.0 V output with an initial accuracy of ±4 mV (A Grade) or ±1.5 mV (B Grade). It operates within a supply voltage range of 5.0 V to 18 V and draws a typical quiescent current of 800 µA. The device features low temperature coefficients of 10 ppm/°C (A Grade) or 3 ppm/°C (B Grade) over the -40°C to +125°C range. It supports sourcing up to 30 mA and sinking up to -20 mA, includes a trim terminal for ±5% adjustment, and requires no external capacitors.

Feature Summary

• Utilizes XFET technology to minimize voltage change versus temperature nonlinearity.
• Provides high output source and sink current capability without requiring external capacitors.
• Includes a dedicated trim terminal to adjust output voltage without compromising performance.

Applications

• Precision data acquisition systems
• High resolution data converters
• Medical instruments
• Industrial process control systems

Procurement Notes

Verify the specific grade (A or B) required for your application's accuracy needs, as the base part number may not specify it. Confirm the package type matches your PCB layout requirements. Ensure the input voltage stays within the specified operating range to maintain regulation. Check for any specific ordering suffixes that might indicate reel packaging if applicable.

Selection Notes

Select this component when a stable 3.0 V reference is needed with low noise and high drive capability. Consider the A Grade for general precision applications or the B Grade for tighter tolerance requirements. Evaluate the power dissipation if operating near maximum load currents or temperatures. Ensure the supply voltage headroom meets the minimum 2 V requirement relative to the output.

Part Context

This component belongs to the ADR430/ADR431/ADR433/ADR434/ADR435 series of ultralow noise XFET voltage references. These devices share common architectural features such as low supply current and high accuracy but differ in their nominal output voltages and minimum operating supply voltages. The ADR433 specifically targets 3.0 V applications.

Replacement Considerations

Other members of the ADR43x family (ADR430, ADR431, ADR434, ADR435) are pin-compatible but offer different output voltages. Verify that the alternative part's output voltage matches the system requirement before substitution.

FAQ

Does the ADR433 require external capacitors for operation?

No, the ADR433 does not require external capacitors for basic operation, although a compensation network can be added to reduce noise.

What is the function of the TRIM pin?

The TRIM pin allows for the adjustment of the output voltage over a ±5% range without compromising the device's performance specifications.