ZR285F01TC Equivalent & Substitute Parts

Part Overview

The ZR285F01TC is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 2.5V output with ±1% tolerance. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The part operates in the -40°C to 85°C temperature range and is packaged in SOT-23-3 surface mount configuration, suitable for precision voltage reference applications in power management circuits.

Substiute Parts

ZR285F01TC

Diodes IncorporatedIn Stock: 1035ZR285F01TC Datasheet

Current PartRFQ

LM385M3-2.5/NOPB

Texas InstrumentsIn Stock: 7607LM385M3-2.5/NOPB Datasheet

MFR RecommendedRFQ

LM385M3X-2.5/NOPB

Texas InstrumentsIn Stock: 60977LM385M3X-2.5/NOPB Datasheet

MFR RecommendedRFQ

LM4040DEM3X-2.5/NOPB

National SemiconductorIn Stock: 20242LM4040DEM3X-2.5/NOPB Datasheet

MFR RecommendedRFQ

LM4040EEM3-2.5/NOPB

Texas InstrumentsIn Stock: 7611LM4040EEM3-2.5/NOPB Datasheet

MFR RecommendedRFQ

SPX385AM-L-2-5/TR

MaxLinear, Inc.In Stock: 6636SPX385AM-L-2-5/TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ZR285F01TC is determined by the following critical parameters: fixed 2.5V output voltage, SOT-23-3 package, shunt reference type, and surface mount configuration. The substitute parts are grouped into two categories based on electrical performance alignment:

Category 1: Direct Electrical Equivalents (±1% Tolerance, 20 mA Output) These parts maintain the same output tolerance and current rating as the original ZR285F01TC, ensuring minimal circuit redesign requirements.

Category 2: Compatible Alternatives (±2-3% Tolerance, 15-20 mA Output) These parts provide the same 2.5V fixed output and SOT-23-3 package but with relaxed tolerance specifications or reduced output current. Selection depends on circuit tolerance requirements.

The allowed substitution parameters are: output voltage (2.5V fixed), package type (SOT-23-3), reference type (shunt), mounting type (surface mount), and compliance certifications (RoHS3).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Minimum Circuit Modification): SPX385AM-L-2-5/TR (MaxLinear, Inc.) is the closest functional equivalent, matching the ZR285F01TC in output current (20 mA), tolerance (±1%), and operating temperature range (-40°C ~ 85°C). This part is active and RoHS compliant, making it suitable for new production designs requiring the same electrical performance.

For Tolerance-Relaxed Applications: LM385M3-2.5/NOPB and LM385M3X-2.5/NOPB (Texas Instruments) provide 2.5V fixed output with 20 mA current but with ±3% tolerance. These parts are active and widely available. Selection is appropriate when circuit design permits ±3% tolerance and operating temperature range is limited to 0°C ~ 70°C.

For Extended Temperature Range with Improved Noise Performance: LM4040EEM3-2.5/NOPB (Texas Instruments) and LM4040DEM3X-2.5/NOPB (National Semiconductor) offer extended operating temperature (-40°C ~ 125°C), superior noise characteristics (35µVrms), and ±1-2% tolerance. Output current is reduced to 15 mA. These parts are suitable for precision applications requiring lower noise and wider temperature operation.

All substitute parts maintain SOT-23-3 package compatibility and shunt reference architecture, ensuring direct PCB footprint compatibility with the original ZR285F01TC design.

Frequently Asked Questions (FAQ)

Q: Can I use LM385M3-2.5/NOPB as a direct replacement for ZR285F01TC? A: LM385M3-2.5/NOPB is functionally compatible but with differences: it has ±3% tolerance versus ±1%, operates at 0°C ~ 70°C versus -40°C ~ 85°C, and has higher noise (120µVrms versus 60µVrms). Use this part only if your circuit tolerates these parameter variations.

Q: What is the key difference between LM4040EEM3-2.5/NOPB and LM385M3-2.5/NOPB? A: Both provide 2.5V fixed output in SOT-23-3 packages. LM4040EEM3-2.5/NOPB has ±2% tolerance, lower noise (35µVrms), extended temperature range (-40°C ~ 125°C), but reduced output current (15 mA). LM385M3-2.5/NOPB has ±3% tolerance, higher noise (120µVrms), limited temperature range (0°C ~ 70°C), but maintains 20 mA output current.

Q: Is SPX385AM-L-2-5/TR a pin-compatible replacement? A: Yes. SPX385AM-L-2-5/TR uses the same SOT-23-3 package as ZR285F01TC with identical pinout. It matches the original part in output current (20 mA), tolerance (±1%), and operating temperature range (-40°C ~ 85°C).

Q: Can I substitute parts with different output current ratings? A: Output current differences (20 mA versus 15 mA) are acceptable if your circuit design does not require the full 20 mA output current. Verify that your load current does not exceed the substitute part's rated output current.

Q: What compliance certifications should I verify for new designs? A: All listed substitute parts are RoHS compliant. Verify ROHS3 compliance status for your specific application requirements. SPX385AM-L-2-5/TR is RoHS compliant; LM4040DEM3X-2.5/NOPB compliance status is not specified in available data.

Q: Are there temperature range limitations I should consider? A: Yes. LM385M3-2.5/NOPB and LM385M3X-2.5/NOPB operate only at 0°C ~ 70°C, which is narrower than the original ZR285F01TC (-40°C ~ 85°C). For applications requiring the full -40°C ~ 85°C range, use SPX385AM-L-2-5/TR or the LM4040 series (which extends to 125°C).