ZR285R02STZ Equivalent & Substitute Parts

Part Overview

The ZR285R02STZ is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 2.5V output with ±2% tolerance. This component is classified as a Power Management (PMIC) device and is packaged in TO-92 configuration for through-hole mounting applications. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±2%
Temperature Coefficient	90ppm/°C
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	20 µA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZR285R02STZ is determined by strict electrical and mechanical compatibility criteria. All substitute parts must maintain the following core parameters:

Fixed 2.5V output voltage
TO-92-3 package configuration with through-hole mounting
20 mA output current capability
Operating temperature range of -40°C to 85°C or wider
Shunt reference type with fixed output configuration
Tolerance of ±2% or better (±1.5% or ±3% acceptable within design margin)
Cathode current of 20 µA or compatible specification

Substitute parts are grouped by manufacturer and tolerance specification. Parts with ±1.5% tolerance provide improved accuracy over the original ±2% specification. Parts with ±3% tolerance represent a relaxed tolerance variant. Temperature coefficient and noise specifications vary among substitutes but remain within acceptable ranges for typical shunt reference applications.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Noise (10Hz-10kHz)	Cathode Current	Temp Range	Product Status
ZR285R02STZ	Diodes Incorporated	2.5V	±2%	90ppm/°C	60µVrms	20 µA	-40°C ~ 85°C	Obsolete
LM285LPR-2-5	Texas Instruments	2.5V	±1.5%	20ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	Active
LM285LPRE3-2-5	Texas Instruments	2.5V	±1.5%	20ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	Active
LM285Z-2.5/LFT7	National Semiconductor	2.5V	±1.5%	150ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	Active
LM285Z-2.5RAG	onsemi	2.5V	±1.5%	80ppm/°C	120µVrms	30 µA	-40°C ~ 85°C	Active
LM285Z-2.5RPG	onsemi	2.5V	±1.5%	80ppm/°C	120µVrms	30 µA	-40°C ~ 85°C	Active
LM385BLPR-2-5	Texas Instruments	2.5V	±1.5%	20ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active
LM385BZ-2.5/LFT7	Texas Instruments	2.5V	±1.5%	150ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active
LM385LPR-2-5	Texas Instruments	2.5V	±3%	20ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active
LM385Z-2.5/LFT1	National Semiconductor	2.5V	±3%	150ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active
LM385Z-2.5/LFT2	Texas Instruments	2.5V	±3%	150ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active

Engineering Selection Recommendations

For applications requiring full temperature range operation (-40°C to 85°C), select from the LM285 series parts: LM285LPR-2-5, LM285LPRE3-2-5, LM285Z-2.5/LFT7, LM285Z-2.5RAG, or LM285Z-2.5RPG. These parts maintain active product status and provide ±1.5% tolerance, which exceeds the original ±2% specification.

For applications with restricted temperature range (0°C to 70°C), the LM385 series offers active alternatives: LM385BLPR-2-5, LM385BZ-2.5/LFT7, LM385LPR-2-5, LM385Z-2.5/LFT1, and LM385Z-2.5/LFT2. The LM385BLPR-2-5 and LM385BZ-2.5/LFT7 provide ±1.5% tolerance, while LM385LPR-2-5, LM385Z-2.5/LFT1, and LM385Z-2.5/LFT2 offer ±3% tolerance.

All recommended substitutes are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance equivalent to the original part. Texas Instruments and onsemi parts demonstrate superior temperature coefficient performance (20ppm/°C to 80ppm/°C) compared to the original 90ppm/°C specification.

Frequently Asked Questions (FAQ)

Q: Can LM385 series parts directly replace the ZR285R02STZ?

A: LM385 series parts are electrically compatible but operate within a restricted temperature range of 0°C to 70°C, compared to the original -40°C to 85°C range. Selection depends on application temperature requirements.

Q: What is the difference between ±1.5% and ±3% tolerance variants?

A: Tolerance specification defines the maximum deviation of output voltage from the nominal 2.5V value. ±1.5% tolerance provides tighter voltage regulation (2.4625V to 2.5375V) compared to ±3% tolerance (2.425V to 2.575V). Applications requiring precise voltage reference should select ±1.5% variants.

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

A: All listed substitute parts are available in TO-92-3 package configuration with through-hole mounting, maintaining mechanical compatibility with the original ZR285R02STZ footprint.

Q: How do temperature coefficient differences affect circuit performance?

A: Temperature coefficient (ppm/°C) indicates voltage drift across the operating temperature range. Lower values indicate better temperature stability. The original part specifies 90ppm/°C; substitute parts range from 20ppm/°C to 150ppm/°C. Selection should align with application temperature stability requirements.

Q: Which substitute offers the best overall performance match?

A: LM285LPR-2-5 and LM285LPRE3-2-5 from Texas Instruments provide the closest performance match, offering ±1.5% tolerance, 20ppm/°C temperature coefficient, full -40°C to 85°C temperature range, and active product status with high inventory availability.

Q: Are packaging variants (Cut Tape, Bulk, Tape & Reel) electrically equivalent?

A: Packaging variants represent different supply formats for the same electrical component. Cut Tape, Bulk, and Tape & Reel packaging contain identical die and electrical specifications; selection depends on procurement and assembly requirements.

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