ZR285F02TA Equivalent & Substitute Parts

Part Overview

The ZR285F02TA is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 2.5V output with ±2% tolerance in a compact SOT-23-3 surface mount package. This device operates across the industrial temperature range of -40°C to 85°C and delivers 20 mA output current with low noise characteristics (60µVrms at 10Hz to 10kHz). The part is currently in Last Time Buy status, making equivalent substitutes necessary for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Voltage	2.5V Fixed
Output Current	20 mA
Tolerance	±2%
Temperature Coefficient	90ppm/°C
Noise (10Hz to 10kHz)	60µVrms
Operating Temperature Range	-40°C to 85°C
Package	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZR285F02TA is determined by strict equivalence in the following parameters:

Output voltage: 2.5V fixed
Package type: SOT-23-3 surface mount
Reference type: Shunt configuration
Mounting compatibility: Surface mount on identical footprint

Substitute parts must maintain the same output voltage and package form factor to ensure direct PCB compatibility. Variations in output current, tolerance, temperature coefficient, and noise characteristics are permitted provided the substitute meets or exceeds the application requirements. Operating temperature range and product status are secondary considerations for design flexibility.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coefficient	Noise (10Hz-10kHz)	Operating Temp Range	Product Status
ZR285F02TA	Diodes Incorporated	2.5V	20 mA	±2%	90ppm/°C	60µVrms	-40°C to 85°C	Last Time Buy
ADR5041ARTZ-REEL7	Analog Devices Inc.	2.5V	15 mA	±0.2%	100ppm/°C	150µVrms	-40°C to 125°C	Active
LM385M3-2.5/NOPB	Texas Instruments	2.5V	20 mA	±3%	150ppm/°C	120µVrms	0°C to 70°C	Active
LM385M3X-2.5/NOPB	Texas Instruments	2.5V	20 mA	±3%	150ppm/°C	120µVrms	0°C to 70°C	Active
LM4040DEM3X-2.5/NOPB	National Semiconductor	2.5V	15 mA	±1%	150ppm/°C	35µVrms	-40°C to 125°C	Active
LM4040EEM3-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	150ppm/°C	35µVrms	-40°C to 125°C	Active
LM4040EIM3-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	150ppm/°C	35µVrms	-40°C to 85°C	Active
LM4040EIM3X-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	150ppm/°C	35µVrms	-40°C to 85°C	Active
LM4431M3-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	30ppm/°C	35µVrms	0°C to 70°C	Active
LM4431M3X-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	30ppm/°C	35µVrms	0°C to 70°C	Active
SPX385AM-L-2-5/TR	MaxLinear, Inc.	2.5V	20 mA	±1%	140ppm/°C	120µVrms	-40°C to 85°C	Active

Engineering Selection Recommendations

All listed substitute parts are Active status devices with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring long-term availability and environmental regulatory compliance.

For applications requiring the full industrial temperature range (-40°C to 85°C) with 20 mA output current capacity, the SPX385AM-L-2-5/TR from MaxLinear provides direct functional equivalence with improved ±1% tolerance and Active product status.

For applications where reduced output current (15 mA) is acceptable, the LM4040EIM3-2.5/NOPB or LM4040EIM3X-2.5/NOPB from Texas Instruments offer identical tolerance (±2%) and operating temperature range (-40°C to 85°C) with superior noise performance (35µVrms).

The ADR5041ARTZ-REEL7 from Analog Devices provides the widest operating temperature range (-40°C to 125°C) and tightest tolerance (±0.2%) for precision applications, though with reduced output current (15 mA).

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower output current than the ZR285F02TA?

A: Yes, provided your circuit design does not require the full 20 mA output current. Substitute parts with 15 mA output current (such as LM4040EEM3-2.5/NOPB or ADR5041ARTZ-REEL7) are electrically compatible. Verify your application's current requirements before selection.

Q: Are all substitute parts pin-compatible with the ZR285F02TA?

A: Yes. All listed substitutes use the SOT-23-3 package (TO-236-3, SC-59), which provides identical pinout and PCB footprint compatibility. No layout modifications are required.

Q: What is the difference between tolerance specifications?

A: Tolerance defines the maximum deviation of output voltage from the nominal 2.5V value. The ZR285F02TA specifies ±2% tolerance. Substitutes with tighter tolerance (±0.2%, ±1%) provide more precise voltage output; substitutes with looser tolerance (±3%) are acceptable if your circuit tolerates wider voltage variation.

Q: Why do some substitutes have different operating temperature ranges?

A: Operating temperature range defines the ambient conditions under which the device maintains specified performance. The ZR285F02TA operates from -40°C to 85°C. Substitutes with narrower ranges (0°C to 70°C) are suitable only for applications within those limits. Substitutes with wider ranges (-40°C to 125°C) provide extended environmental flexibility.

Q: What does temperature coefficient mean in this context?

A: Temperature coefficient (ppm/°C) specifies how much the output voltage changes per degree Celsius change in operating temperature. Lower values indicate better voltage stability across temperature variations. The ZR285F02TA has 90ppm/°C; substitutes range from 30ppm/°C to 150ppm/°C.

Q: Can I substitute based on noise specifications alone?

A: No. Noise performance is a secondary parameter. Primary substitution criteria are fixed output voltage (2.5V) and SOT-23-3 package. Noise specifications (measured in µVrms) should be evaluated only after confirming voltage and package compatibility with your application requirements.

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