ZR40402R50STZ Equivalent & Substitute Parts

Part Overview

The ZR40402R50STZ is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 5V output with ±2% tolerance. This through-hole component operates across the industrial temperature range of -40°C to 85°C and is packaged in an E-Line (TO-92 compatible) configuration. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

ZR40402R50STZ

Diodes IncorporatedIn Stock: 1208ZR40402R50STZ Datasheet

Current PartRFQ

ZR40402F50TA

Diodes IncorporatedIn Stock: 5942ZR40402F50TA Datasheet

MFR RecommendedRFQ

LM4040BIZ-4.1/NOPB

National SemiconductorIn Stock: 9286LM4040BIZ-4.1/NOPB Datasheet

MFR RecommendedRFQ

LM4040C50ILPR

Texas InstrumentsIn Stock: 22223LM4040C50ILPR Datasheet

MFR RecommendedRFQ

LM4040CIZ-4.1/NOPB

National SemiconductorIn Stock: 527047LM4040CIZ-4.1/NOPB Datasheet

MFR RecommendedRFQ

LM4040D50ILPR

Texas InstrumentsIn Stock: 1450LM4040D50ILPR Datasheet

MFR RecommendedRFQ

LM4040D50ILPRE3

Texas InstrumentsIn Stock: 1811LM4040D50ILPRE3 Datasheet

MFR RecommendedRFQ

LM4040DIZ-5.0/LFT1

National SemiconductorIn Stock: 41969LM4040DIZ-5.0/LFT1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZR40402R50STZ is determined by the following critical parameters:

• Output Voltage: Must be 5V fixed output
• Reference Type: Shunt voltage reference topology
• Output Current: 15 mA nominal
• Mounting Type: Through-hole configuration for direct PCB compatibility
• Operating Temperature Range: -40°C to 85°C
• Tolerance and Stability: Voltage tolerance and temperature coefficient determine circuit accuracy requirements

Substitute parts are grouped into two categories:

Category 1 - Direct Through-Hole Equivalents (Same Package Type) Parts maintaining E-Line or TO-92-3 through-hole packaging with 5V output, enabling direct pin-compatible replacement without PCB layout modification.

Category 2 - Surface Mount Alternative (Different Package Type) Parts with 5V output in SOT-23-3 surface mount packaging, requiring PCB redesign but offering improved thermal performance and modern manufacturing compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (Through-Hole, 5V Output)

LM4040C50ILPR (Texas Instruments) is the recommended primary substitute. This part maintains through-hole TO-92-3 packaging for direct PCB compatibility, delivers 5V fixed output, and holds active product status ensuring long-term availability. The ±0.5% tolerance provides improved accuracy compared to the original ±2%, with lower noise performance (80 µVrms vs. 105 µVrms). RoHS3 compliance and industrial temperature range (-40°C to 85°C) match the original specification.

LM4040D50ILPR (Texas Instruments) serves as a secondary option with ±1% tolerance and active status. This part offers a balance between the original tolerance and the tighter tolerance of the LM4040C50ILPR variant.

LM4040DIZ-5.0/LFT1 (National Semiconductor) provides an alternative through-hole solution with active product status, ±1% tolerance, and equivalent electrical performance.

For Surface Mount Redesign (SOT-23-3, 5V Output)

ZR40402F50TA (Diodes Incorporated) is the surface mount equivalent from the same manufacturer family. This part maintains identical electrical specifications (5V, ±2% tolerance, 100 ppm/°C) but requires PCB layout modification. The Last Time Buy status indicates limited future availability.

For Applications Requiring Different Output Voltages

LM4040BIZ-4.1/NOPB and LM4040CIZ-4.1/NOPB provide 4.096V fixed output alternatives. These parts are suitable only for designs where 4.096V reference voltage is acceptable. Both are obsolete and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use LM4040C50ILPR as a direct replacement for ZR40402R50STZ?

A: Yes. Both parts are through-hole TO-92-3 packages with 5V fixed output and -40°C to 85°C operating range. Pin configuration is compatible. The LM4040C50ILPR offers improved tolerance (±0.5% vs. ±2%) and lower noise, making it functionally superior. No PCB modification is required.

Q: What is the difference between LM4040C50ILPR and LM4040D50ILPR?

A: Both are 5V shunt references in TO-92-3 packages from Texas Instruments. The LM4040C50ILPR has ±0.5% tolerance with 100 ppm/°C temperature coefficient. The LM4040D50ILPR has ±1% tolerance with 150 ppm/°C temperature coefficient. Select based on your circuit's accuracy requirements.

Q: Why is ZR40402F50TA listed as a substitute if it uses a different package?

A: ZR40402F50TA is a surface mount (SOT-23-3) variant from the same manufacturer with identical electrical specifications. It is listed as an alternative for designs undergoing PCB redesign or modernization. Direct pin replacement is not possible without layout changes.

Q: Can I use parts with 4.096V output like LM4040BIZ-4.1/NOPB?

A: No. The 4.096V output voltage is fundamentally different from the 5V specification of the original part. These are not substitutes unless your circuit design explicitly requires 4.096V reference voltage.

Q: Which substitute has the best long-term availability?

A: LM4040C50ILPR and LM4040DIZ-5.0/LFT1 both carry active product status from their respective manufacturers, ensuring continued availability. Avoid parts marked as obsolete or Last Time Buy for new designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance, matching the environmental and regulatory requirements of the original ZR40402R50STZ.