ZR285R01STZ Equivalent & Substitute Parts

Part Overview

The ZR285R01STZ is a shunt voltage reference IC manufactured by Diodes Incorporated, providing a fixed 2.5V output with ±1% tolerance in a TO-92 through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part delivers 20 mA output current with a temperature coefficient of 90 ppm/°C and operates across the industrial temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output	2.5V
Current - Output	20 mA
Tolerance	±1%
Temperature Coefficient	90 ppm/°C
Noise (10Hz to 10kHz)	60 µVrms
Current - Cathode	20 µA
Operating Temperature	-40°C to 85°C
Mounting Type	Through Hole
Package	TO-92-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZR285R01STZ is determined by the following critical parameters:

Output Voltage: Must be 2.5V fixed
Output Current: Must be 20 mA
Package Type: Must be TO-92-3 through-hole configuration
Reference Type: Must be shunt topology
Operating Temperature Range: Must support -40°C to 85°C minimum
RoHS Compliance: Must meet ROHS3 requirements

Substitute parts are grouped into two categories based on tolerance specifications:

Category A (±1.5% Tolerance): LM285LPR-2-5, LM285LPRE3-2-5, LM285Z-2.5/LFT7, LM285Z-2.5RAG, LM285Z-2.5RPG, LM385BLPR-2-5, LM385BZ-2.5/LFT7

Category B (±3% Tolerance): LM385LPR-2-5, LM385Z-2.5/LFT1, LM385Z-2.5/LFT2

All substitute parts maintain identical output voltage, current, package configuration, and mounting type. Tolerance and temperature coefficient variations are documented for circuit-level evaluation.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Noise (10Hz-10kHz)	Cathode Current	Operating Temp	Status
ZR285R01STZ	Diodes Incorporated	2.5V	20 mA	±1%	90 ppm/°C	60 µVrms	20 µA	-40°C to 85°C	Obsolete
LM285LPR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20 ppm/°C	120 µVrms	20 µA	-40°C to 85°C	Active
LM285LPRE3-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20 ppm/°C	120 µVrms	20 µA	-40°C to 85°C	Active
LM285Z-2.5/LFT7	National Semiconductor	2.5V	20 mA	±1.5%	150 ppm/°C	120 µVrms	20 µA	-40°C to 85°C	Active
LM285Z-2.5RAG	onsemi	2.5V	20 mA	±1.5%	80 ppm/°C	120 µVrms	30 µA	-40°C to 85°C	Active
LM285Z-2.5RPG	onsemi	2.5V	20 mA	±1.5%	80 ppm/°C	120 µVrms	30 µA	-40°C to 85°C	Active
LM385BLPR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20 ppm/°C	120 µVrms	20 µA	0°C to 70°C	Active
LM385BZ-2.5/LFT7	Texas Instruments	2.5V	20 mA	±1.5%	150 ppm/°C	120 µVrms	20 µA	0°C to 70°C	Active
LM385LPR-2-5	Texas Instruments	2.5V	20 mA	±3%	20 ppm/°C	120 µVrms	20 µA	0°C to 70°C	Active
LM385Z-2.5/LFT1	National Semiconductor	2.5V	20 mA	±3%	150 ppm/°C	120 µVrms	20 µA	0°C to 70°C	Active
LM385Z-2.5/LFT2	Texas Instruments	2.5V	20 mA	±3%	150 ppm/°C	120 µVrms	20 µA	0°C to 70°C	Active

Engineering Selection Recommendations

Primary Substitutes for Full Temperature Range (-40°C to 85°C)

For applications requiring the complete industrial temperature range of the original ZR285R01STZ, select from: LM285LPR-2-5, LM285LPRE3-2-5, LM285Z-2.5/LFT7, LM285Z-2.5RAG, or LM285Z-2.5RPG. All are active products with ROHS3 compliance and support the full -40°C to 85°C operating window. These parts feature ±1.5% tolerance, which is tighter than the original ±1% specification but acceptable for most applications.

Secondary Substitutes for Commercial Temperature Range (0°C to 70°C)

For applications limited to commercial temperature ranges, LM385BLPR-2-5 and LM385BZ-2.5/LFT7 are available with ±1.5% tolerance. LM385LPR-2-5, LM385Z-2.5/LFT1, and LM385Z-2.5/LFT2 offer ±3% tolerance within the 0°C to 70°C range.

Compliance Considerations

All substitute parts maintain ROHS3 compliance and are classified as active products with established supply chains. The original ZR285R01STZ is obsolete; substitution is required for new procurement.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with ±1.5% tolerance instead of the original ±1% tolerance?

A: Yes, if your circuit design accommodates the wider tolerance band. The ±1.5% tolerance parts (LM285 series) are tighter than the original specification and suitable for most applications. Verify your circuit's tolerance requirements before selection.

Q: What is the difference between LM285 and LM385 series parts?

A: Both series provide identical 2.5V output and 20 mA current in TO-92-3 packages. The primary differences are temperature coefficient (LM285 typically 20-80 ppm/°C vs. LM385 at 150 ppm/°C) and operating temperature range. LM285 parts support -40°C to 85°C; LM385 parts are limited to 0°C to 70°C.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes, all listed substitute parts use TO-92-3 through-hole packaging with identical pinout and mechanical compatibility. Direct board-level substitution is possible without layout modifications.

Q: Why do some parts show higher cathode current (30 µA vs. 20 µA)?

A: Cathode current variation reflects manufacturing differences between suppliers. The 30 µA specification for onsemi parts (LM285Z-2.5RAG, LM285Z-2.5RPG) remains within acceptable operating parameters and does not affect functional compatibility.

Q: Which substitute offers the lowest temperature coefficient?

A: Texas Instruments LM285LPR-2-5 and LM285LPRE3-2-5 offer the lowest temperature coefficient at 20 ppm/°C typical, compared to the original 90 ppm/°C. This provides superior voltage stability across temperature variations.

Q: Can I use parts with different operating temperature ranges interchangeably?

A: No. If your application requires -40°C to 85°C operation, select only LM285 series parts. LM385 series parts rated 0°C to 70°C are not suitable for extended temperature applications.

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