ZR285F03TC Equivalent & Substitute Parts

Part Overview

The ZR285F03TC is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 2.5V output with ±3% tolerance. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates in the -40°C to 85°C temperature range and is housed in a SOT-23-3 surface mount package, delivering 20 mA output current with low noise characteristics suitable for precision analog applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the ZR285F03TC is determined by the following critical parameters:

Fixed output voltage of 2.5V
SOT-23-3 surface mount package compatibility
Shunt reference topology
Operating temperature range capability
Output current rating of 20 mA or higher
Tolerance specification of ±3% or better
RoHS3 compliance for regulatory alignment

Substitute parts must maintain electrical equivalence across these parameters while accommodating minor variations in temperature coefficient, noise performance, and cathode current that do not affect circuit functionality in standard applications.

Parameter Comparison

Parameter	ZR285F03TC	LM385M3-2.5/NOPB	LM385M3X-2.5/NOPB	LM4040DEM3X-2.5/NOPB	LM4040EEM3-2.5/NOPB	SPX385AM-L-2-5/TR
Manufacturer	Diodes Incorporated	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments	MaxLinear, Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active
Voltage - Output (Min/Fixed)	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V
Current - Output	20 mA	20 mA	20 mA	15 mA	15 mA	20 mA
Tolerance	±3%	±3%	±3%	±1%	±2%	±1%
Temperature Coefficient	90ppm/°C	150ppm/°C	150ppm/°C	150ppm/°C	150ppm/°C	140ppm/°C
Noise - 10Hz to 10kHz	60µVrms	120µVrms	120µVrms	35µVrms	35µVrms	120µVrms
Current - Cathode	20 µA	15 µA	15 µA	73 µA	73 µA	20 µA
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM385M3-2.5/NOPB and LM385M3X-2.5/NOPB from Texas Instruments provide direct electrical equivalence with matching 20 mA output current and ±3% tolerance. Both are active products with ROHS3 compliance. The LM385M3X-2.5/NOPB variant offers higher inventory availability (60,930 pcs) and is supplied in Tape & Reel packaging. Operating temperature range is limited to 0°C to 70°C, which restricts use in applications requiring the full -40°C to 85°C range of the original part.

SPX385AM-L-2-5/TR from MaxLinear, Inc. matches the original part's 20 mA output current and -40°C to 85°C operating temperature range. This part offers improved tolerance (±1%) and maintains RoHS compliance. Temperature coefficient is 140ppm/°C, slightly lower than the original 90ppm/°C specification.

Secondary Substitutes (Enhanced Performance):

LM4040DEM3X-2.5/NOPB and LM4040EEM3-2.5/NOPB from Texas Instruments and National Semiconductor respectively provide superior tolerance (±1% to ±2%) and lower noise performance (35µVrms). Both support extended operating temperature to 125°C. Output current is reduced to 15 mA, which is acceptable for applications not requiring the full 20 mA specification. ROHS3 compliance is confirmed for the LM4040EEM3-2.5/NOPB variant.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part. Selection should prioritize active product status and confirmed inventory availability for production continuity.

Frequently Asked Questions (FAQ)

Q: Can LM385M3-2.5/NOPB be used as a direct replacement for ZR285F03TC?

A: Yes, LM385M3-2.5/NOPB is electrically equivalent with identical output voltage (2.5V), output current (20 mA), and tolerance (±3%). Both use SOT-23-3 packaging. The operating temperature range differs: LM385M3-2.5/NOPB operates 0°C to 70°C versus the original 0°C to 85°C. Verify application temperature requirements before selection.

Q: What is the difference between LM385M3-2.5/NOPB and LM385M3X-2.5/NOPB?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: LM385M3-2.5/NOPB is supplied in Cut Tape (CT) & Digi-Reel format, while LM385M3X-2.5/NOPB is supplied in Tape & Reel (TR) format. LM385M3X-2.5/NOPB has significantly higher inventory availability (60,930 pcs versus 7,565 pcs).

Q: Why do LM4040 series parts show lower output current (15 mA vs 20 mA)?

A: LM4040 series are precision voltage references with tighter tolerance specifications (±1% to ±2%) and lower noise performance. The 15 mA output current is sufficient for most reference applications. Use LM4040 variants only if the circuit design accommodates the reduced current specification.

Q: Is SPX385AM-L-2-5/TR suitable for low-temperature applications?

A: Yes, SPX385AM-L-2-5/TR supports the full -40°C to 85°C operating temperature range matching the original ZR285F03TC. This makes it suitable for industrial and automotive applications requiring extended temperature operation.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitutes maintain RoHS compliance. LM385M3-2.5/NOPB, LM385M3X-2.5/NOPB, LM4040EEM3-2.5/NOPB, and SPX385AM-L-2-5/TR are explicitly ROHS3 compliant. LM4040DEM3X-2.5/NOPB compliance status is not specified in available documentation.

Q: Can I use a substitute part with better tolerance (±1% or ±2%) in place of the ±3% original?

A: Yes, parts with tighter tolerance specifications are functionally compatible and provide improved performance. LM4040 series parts with ±1% to ±2% tolerance are direct substitutes that enhance circuit accuracy without requiring design modifications.

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