ZR285R01STOB Equivalent & Substitute Parts

Part Overview

The ZR285R01STOB is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 2.5V output with ±1% tolerance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 85°C and is housed in a TO-92 package suitable for through-hole applications.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±1%
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

Substitute parts for the ZR285R01STOB are selected based on strict electrical and mechanical compatibility criteria. The following parameters must align for functional equivalence:

Fixed output voltage of 2.5V
Shunt reference type with 20 mA output current capability
TO-92-3 package configuration with through-hole mounting
Operating temperature range of -40°C to 85°C minimum
Current cathode specification of 20 µA or compatible
RoHS3 compliance and REACH unaffected status

Tolerance and temperature coefficient variations are acceptable within the substitute group, as these represent performance enhancements or trade-offs suitable for different application requirements. Noise specifications remain consistent across all qualified substitutes at 120µVrms in the 10Hz to 10kHz band.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Noise (10Hz-10kHz)	Cathode Current	Temp Range	Package	Status
ZR285R01STOB	Diodes Incorporated	2.5V	±1%	90ppm/°C	60µVrms	20 µA	-40°C ~ 85°C	TO-92-3	Obsolete
LT1004IZ-2.5#TRPBF	Analog Devices Inc.	2.5V	±0.8%	20ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	TO-92-3	Active
LM285LPR-2-5	Texas Instruments	2.5V	±1.5%	20ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	TO-92-3	Active
LM285LPRE3-2-5	Texas Instruments	2.5V	±1.5%	20ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	TO-92-3	Active
LM285Z-2.5/LFT7	National Semiconductor	2.5V	±1.5%	150ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	TO-92-3	Active
LM285Z-2.5RAG	onsemi	2.5V	±1.5%	80ppm/°C	120µVrms	30 µA	-40°C ~ 85°C	TO-92-3	Active
LM285Z-2.5RPG	onsemi	2.5V	±1.5%	80ppm/°C	120µVrms	30 µA	-40°C ~ 85°C	TO-92-3	Active
LM385BLPR-2-5	Texas Instruments	2.5V	±1.5%	20ppm/°C	120µVrms	20 µA	0°C ~ 70°C	TO-92-3	Active
LM385BZ-2.5/LFT7	Texas Instruments	2.5V	±1.5%	150ppm/°C	120µVrms	20 µA	0°C ~ 70°C	TO-92-3	Active
LM385LPR-2-5	Texas Instruments	2.5V	±3%	20ppm/°C	120µVrms	20 µA	0°C ~ 70°C	TO-92-3	Active
LM385Z-2.5/LFT1	National Semiconductor	2.5V	±3%	150ppm/°C	120µVrms	20 µA	0°C ~ 70°C	TO-92-3	Active

Engineering Selection Recommendations

All substitute parts listed maintain active product status with manufacturers, ensuring long-term availability and supply chain stability. Selection should prioritize parts with matching or superior tolerance specifications and temperature ranges that encompass the original -40°C to 85°C operating window.

For applications requiring the full industrial temperature range (-40°C to 85°C), the following parts are recommended: LT1004IZ-2.5#TRPBF, LM285LPR-2-5, LM285LPRE3-2-5, LM285Z-2.5/LFT7, LM285Z-2.5RAG, and LM285Z-2.5RPG. These maintain full temperature coverage and RoHS3 compliance.

Parts with restricted temperature ranges (0°C to 70°C) including LM385BLPR-2-5, LM385BZ-2.5/LFT7, LM385LPR-2-5, and LM385Z-2.5/LFT1 are suitable only for applications operating within this narrower band. All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LM385BLPR-2-5 replace ZR285R01STOB in all applications?

A: LM385BLPR-2-5 is functionally compatible for the 2.5V shunt reference function and TO-92-3 package. However, its operating temperature range is limited to 0°C to 70°C, compared to the original part's -40°C to 85°C range. Use this substitute only if your application operates within the 0°C to 70°C window.

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

A: Both series provide 2.5V shunt voltage references in TO-92-3 packages with identical output current and cathode current specifications. The primary differences are tolerance grades (LM285 typically ±1.5%, LM385 typically ±1.5% to ±3%) and temperature coefficient values. Selection depends on your application's accuracy requirements.

Q: Is LT1004IZ-2.5#TRPBF a direct replacement?

A: LT1004IZ-2.5#TRPBF is electrically compatible with superior tolerance (±0.8% versus ±1%) and lower temperature coefficient (20ppm/°C typical). It maintains the full -40°C to 85°C temperature range and TO-92-3 package. This part represents a performance upgrade suitable for precision applications.

Q: Why do some substitutes have 30 µA cathode current instead of 20 µA?

A: LM285Z-2.5RAG and LM285Z-2.5RPG specify 30 µA cathode current, which is compatible with the original 20 µA specification. The higher value indicates slightly higher quiescent current draw but does not affect functional equivalence in typical circuit applications.

Q: Are all listed parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 compliance and REACH unaffected status, meeting current environmental and regulatory standards. The original ZR285R01STOB also maintains RoHS3 compliance.

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