ZR285F02TC Equivalent & Substitute Parts

Part Overview

The ZR285F02TC is a shunt voltage reference IC manufactured by Diodes Incorporated, providing a fixed 2.5V output with ±2% tolerance in a SOT-23-3 surface mount 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 low noise characteristics suitable for precision voltage reference applications in power management circuits.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Voltage (Fixed)	2.5V
Output Current	20 mA
Tolerance	±2%
Temperature Coefficient	90 ppm/°C
Noise (10Hz to 10kHz)	60 µVrms
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 for the ZR285F02TC is determined by strict equivalence in the following parameters:

Fixed output voltage of 2.5V
SOT-23-3 surface mount package compatibility
Shunt reference topology
Output current capability of 20 mA or greater
Tolerance specification of ±2% or better
Operating temperature range covering -40°C to 85°C minimum
RoHS3 compliance and MSL-1 moisture sensitivity rating

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (functionally compatible with minor specification variations).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coefficient	Noise (10Hz-10kHz)	Temp Range	Status
ZR285F02TC	Diodes Incorporated	2.5V	20 mA	±2%	90 ppm/°C	60 µVrms	-40°C to 85°C	Obsolete
ZR285F02TA	Diodes Incorporated	2.5V	20 mA	±2%	90 ppm/°C	60 µVrms	-40°C to 85°C	Last Time Buy
LM385M3-2.5/NOPB	Texas Instruments	2.5V	20 mA	±3%	150 ppm/°C	120 µVrms	0°C to 70°C	Active
LM385M3X-2.5/NOPB	Texas Instruments	2.5V	20 mA	±3%	150 ppm/°C	120 µVrms	0°C to 70°C	Active
LM4040DEM3X-2.5/NOPB	National Semiconductor	2.5V	15 mA	±1%	150 ppm/°C	35 µVrms	-40°C to 125°C	Active
LM4040EEM3-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	150 ppm/°C	35 µVrms	-40°C to 125°C	Active
LM4040EIM3-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	150 ppm/°C	35 µVrms	-40°C to 85°C	Active
LM4040EIM3X-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	150 ppm/°C	35 µVrms	-40°C to 85°C	Active
LM4431M3-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	30 ppm/°C	35 µVrms	0°C to 70°C	Active
LM4431M3X-2.5/NOPB	Texas Instruments	2.5V	15 mA	±2%	30 ppm/°C	35 µVrms	0°C to 70°C	Active
SPX385AM-L-2-5/TR	MaxLinear, Inc.	2.5V	20 mA	±1%	140 ppm/°C	120 µVrms	-40°C to 85°C	Active

Engineering Selection Recommendations

Parametric Equivalent (Recommended Primary Substitute): ZR285F02TA from Diodes Incorporated is the direct parametric equivalent with identical electrical specifications. This part maintains the same 2.5V output, 20 mA current, ±2% tolerance, and -40°C to 85°C operating range. The part status is Last Time Buy, indicating continued availability with defined end-of-life timeline.

Active Production Alternatives: For applications requiring active production status and extended availability, SPX385AM-L-2-5/TR from MaxLinear provides the closest match with 20 mA output current, matching the original part's current capability. This part offers superior tolerance (±1%) and maintains the -40°C to 85°C temperature range.

Extended Temperature Range Option: LM4040EEM3-2.5/NOPB and LM4040EIM3-2.5/NOPB from Texas Instruments extend the operating range to -40°C to 125°C while maintaining ±2% tolerance. These parts reduce output current to 15 mA, which is acceptable for applications not requiring the full 20 mA specification.

Lower Noise Alternative: LM4040 series parts (LM4040EEM3-2.5/NOPB, LM4040EIM3-2.5/NOPB, LM4040DEM3X-2.5/NOPB) provide significantly lower noise performance (35 µVrms versus 60 µVrms) with improved temperature stability. These are suitable for precision analog applications where noise performance is critical.

All recommended substitutes maintain SOT-23-3 package compatibility, RoHS3 compliance, and MSL-1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can ZR285F02TA directly replace ZR285F02TC? A: Yes. ZR285F02TA is a parametric equivalent with identical electrical specifications. The primary difference is packaging format (Tape & Reel versus cut tape) and product status (Last Time Buy versus Obsolete).

Q: What is the minimum output current requirement for substitution? A: The ZR285F02TC specifies 20 mA output current. Substitutes with 15 mA output (LM4040 and LM4431 series) are acceptable only if the application circuit does not require the full 20 mA specification. Circuit analysis is required to confirm compatibility.

Q: Are LM385 series parts suitable substitutes? A: LM385M3-2.5/NOPB and LM385M3X-2.5/NOPB provide 20 mA output current matching the original part. However, they specify ±3% tolerance (versus ±2%) and operate only to 0°C to 70°C (versus -40°C to 85°C). These parts are suitable only for applications within the 0°C to 70°C temperature range that can tolerate ±3% tolerance.

Q: What is the difference between cut tape and tape & reel packaging? A: Both formats use SOT-23-3 package geometry and are electrically identical. Cut tape (CT) is supplied in individual strips for manual handling or small-volume pick-and-place operations. Tape & Reel (TR) is supplied on continuous reels for high-volume automated assembly. Selection depends on production volume and assembly equipment capability.

Q: Can I use parts with lower temperature coefficients? A: Yes. LM4431M3-2.5/NOPB and LM4431M3X-2.5/NOPB offer 30 ppm/°C temperature coefficient (versus 90 ppm/°C for the original part), providing superior temperature stability. These parts are direct substitutes for applications benefiting from improved thermal performance.

Q: What compliance certifications apply to all substitutes? A: All listed substitutes maintain RoHS3 compliance and MSL-1 (Unlimited) moisture sensitivity rating, matching the original ZR285F02TC specifications. REACH status is unaffected for all parts.

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