ZR285R03STOB Equivalent & Substitute Parts

Part Overview

The ZR285R03STOB is a shunt voltage reference IC manufactured by Diodes Incorporated, providing a fixed 2.5V output with ±3% tolerance in a TO-92 through-hole package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The device operates across the industrial temperature range of -40°C to 85°C and delivers 20 mA output current, suitable for precision voltage reference applications in power management circuits.

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)
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 ZR285R03STOB is determined by the following critical parameters:

Output Voltage: Must be 2.5V fixed
Output Current: Must be 20 mA
Package Type: Must be TO-92-3 through-hole configuration
Reference Type: Must be shunt voltage reference
Operating Temperature Range: Must support -40°C to 85°C minimum
Tolerance: ±3% or better (tighter tolerance acceptable)
Mounting: Through-hole only

Substitute parts are grouped into two tolerance categories: ±3% tolerance parts (direct equivalents) and ±1.5% tolerance parts (higher precision alternatives). All substitute candidates maintain identical output voltage, current rating, and package configuration. Temperature coefficient and noise specifications vary among substitutes but do not affect functional interchangeability for standard applications.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coeff	Operating Temp	Package	Status
ZR285R03STOB	Diodes Incorporated	2.5V	20 mA	±3%	90ppm/°C	-40°C ~ 85°C	TO-92-3	Obsolete
LM285LPR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	-40°C ~ 85°C	TO-92-3	Active
LM285LPRE3-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	-40°C ~ 85°C	TO-92-3	Active
LM285Z-2.5/LFT7	National Semiconductor	2.5V	20 mA	±1.5%	150ppm/°C	-40°C ~ 85°C	TO-92-3	Active
LM285Z-2.5RAG	onsemi	2.5V	20 mA	±1.5%	80ppm/°C	-40°C ~ 85°C	TO-92-3	Active
LM285Z-2.5RPG	onsemi	2.5V	20 mA	±1.5%	80ppm/°C	-40°C ~ 85°C	TO-92-3	Active
LM385BLPR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	0°C ~ 70°C	TO-92-3	Active
LM385BZ-2.5/LFT7	Texas Instruments	2.5V	20 mA	±1.5%	150ppm/°C	0°C ~ 70°C	TO-92-3	Active
LM385LPR-2-5	Texas Instruments	2.5V	20 mA	±3%	20ppm/°C	0°C ~ 70°C	TO-92-3	Active
LM385Z-2.5/LFT1	National Semiconductor	2.5V	20 mA	±3%	150ppm/°C	0°C ~ 70°C	TO-92-3	Active
LM385Z-2.5/LFT2	Texas Instruments	2.5V	20 mA	±3%	150ppm/°C	0°C ~ 70°C	TO-92-3	Active

Engineering Selection Recommendations

Primary Substitutes (Full Temperature Range -40°C to 85°C):

LM285LPR-2-5 and LM285LPRE3-2-5 from Texas Instruments are the preferred substitutes. Both parts are active, ROHS3 compliant, and maintain the full industrial temperature range of the original ZR285R03STOB. These parts offer improved tolerance (±1.5%) and superior temperature coefficient (20ppm/°C typical), providing enhanced performance in precision applications.

LM285Z-2.5/LFT7 from National Semiconductor and LM285Z-2.5RAG and LM285Z-2.5RPG from onsemi are functionally equivalent alternatives with full temperature range support. The onsemi variants feature lower temperature coefficients (80ppm/°C) compared to the National Semiconductor option (150ppm/°C).

Secondary Substitutes (Restricted Temperature Range 0°C to 70°C):

LM385BLPR-2-5, LM385BZ-2.5/LFT7, LM385LPR-2-5, LM385Z-2.5/LFT1, and LM385Z-2.5/LFT2 operate within a narrower temperature range (0°C to 70°C). These parts are suitable only for applications that do not require the full -40°C to 85°C operating range. LM385LPR-2-5, LM385Z-2.5/LFT1, and LM385Z-2.5/LFT2 maintain the ±3% tolerance specification of the original part.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use LM385BLPR-2-5 as a direct replacement for ZR285R03STOB?

A: LM385BLPR-2-5 is functionally compatible but operates only within 0°C to 70°C. If your application requires the full -40°C to 85°C range, use LM285LPR-2-5 or LM285LPRE3-2-5 instead.

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

A: The ZR285R03STOB specifies ±3% tolerance. Substitute parts with ±1.5% tolerance (LM285 series) provide tighter output voltage accuracy. Both are electrically compatible; the tighter tolerance offers improved precision for applications requiring stricter voltage regulation.

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

A: Yes. All listed substitutes use the TO-92-3 through-hole package with TO-226-3 (TO-226AA) formed leads, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: Which substitute has the best temperature stability?

A: LM285LPR-2-5 and LM285LPRE3-2-5 from Texas Instruments offer the lowest temperature coefficient at 20ppm/°C typical, providing superior temperature stability compared to the original ZR285R03STOB (90ppm/°C).

Q: Can I substitute parts with different cathode current specifications?

A: The LM285Z-2.5RAG and LM285Z-2.5RPG from onsemi specify 30 µA cathode current versus 20 µA for the original part. This difference does not affect functional interchangeability in standard shunt reference applications.

Q: Are all substitutes ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental regulations for new designs and production.

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