ZRC500A03STZ Equivalent & Substitute Parts

Part Overview

The ZRC500A03STZ is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 5V output with ±3% tolerance. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity. Shunt voltage references are critical in precision analog circuits where stable reference voltages are required for measurement, regulation, and signal conditioning applications.

Substiute Parts

ZRC500A03STZ

Diodes IncorporatedIn Stock: 1061ZRC500A03STZ Datasheet

Current PartRFQ

LM4040C50ILPR

Texas InstrumentsIn Stock: 22223LM4040C50ILPR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZRC500A03STZ is determined by the following critical parameters:

• Reference Voltage: 5V fixed output is the primary functional requirement
• Reference Type: Shunt topology must be maintained
• Package Compatibility: TO-92-3 through-hole package ensures mechanical and electrical compatibility
• Operating Temperature Range: -40°C ~ 85°C minimum requirement
• Compliance Standards: ROHS3 compliance and REACH unaffected status

The LM4040C50ILPR qualifies as a substitute based on matching all critical parameters while offering improved electrical characteristics in tolerance and noise performance.

Parameter Comparison

Engineering Selection Recommendations

The LM4040C50ILPR is the qualified substitute for the obsolete ZRC500A03STZ. Selection is based on:

• Product Status: The LM4040C50ILPR maintains active production status, ensuring long-term availability and supply chain continuity
• Compliance Alignment: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements
• Functional Equivalence: Identical 5V fixed output, shunt reference topology, and TO-92-3 package ensure direct mechanical and electrical compatibility
• Electrical Improvements: The substitute offers superior tolerance (±0.5% vs ±3%) and lower noise (80µVrms vs 105µVrms), providing enhanced performance in precision applications

Frequently Asked Questions (FAQ)

Q: Can the LM4040C50ILPR be used as a direct replacement for the ZRC500A03STZ?

A: Yes. Both components share identical output voltage (5V), reference type (shunt), package configuration (TO-92-3), and operating temperature range (-40°C ~ 85°C). The substitute is mechanically and electrically compatible for direct substitution.

Q: What are the differences in electrical performance?

A: The LM4040C50ILPR provides tighter tolerance (±0.5% vs ±3%), lower noise (80µVrms vs 105µVrms), and higher output current capability (15 mA vs 5 mA). Temperature coefficient is marginally higher (100ppm/°C vs 90ppm/°C). These differences represent performance improvements suitable for precision analog applications.

Q: Are there package compatibility concerns?

A: No. Both components use the TO-92-3 through-hole package with formed leads. Pin configuration and mechanical dimensions are compatible, allowing direct board-level substitution without layout modifications.

Q: What compliance certifications apply to the substitute?

A: The LM4040C50ILPR maintains ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original component.

Q: Why is the ZRC500A03STZ obsolete?

A: The ZRC500A03STZ has been discontinued by Diodes Incorporated. The LM4040C50ILPR from Texas Instruments remains in active production and serves the same functional requirements with improved electrical characteristics.