ZR285R02STOB Equivalent & Substitute Parts

Part Overview

The ZR285R02STOB is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 2.5V output with ±2% tolerance. This component is classified as a Power Management (PMIC) device and is packaged in TO-92 configuration for through-hole mounting applications. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements. Substitute parts maintain the same output voltage, current rating, and package form factor while offering improved specifications or active product status from alternative manufacturers.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±2%
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 eligibility for the ZR285R02STOB 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 (TO-226-3) for mechanical and electrical compatibility
Mounting Type: Must be Through Hole
Reference Type: Must be Shunt
Operating Temperature Range: Must support -40°C ~ 85°C minimum

Substitute parts are grouped into two categories based on tolerance specifications:

Category A - Tighter Tolerance (±1.5%): LM285LPR-2-5, LM285LPRE3-2-5, LM285Z-2.5/LFT7, LM285Z-2.5RAG, LM285Z-2.5RPG, LM385BLPR-2-5, LM385BZ-2.5/LFT7

Category B - Equivalent or Relaxed Tolerance (±3%): LM385LPR-2-5, LM385Z-2.5/LFT1, LM385Z-2.5/LFT2

All listed substitutes maintain the same 2.5V output, 20 mA current rating, and TO-92-3 package configuration as the original part.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coeff	Noise 10Hz-10kHz	Cathode Current	Operating Temp	Product Status
ZR285R02STOB	Diodes Incorporated	2.5V	20 mA	±2%	90ppm/°C	60µVrms	20 µA	-40°C ~ 85°C	Obsolete
LM285LPR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	Active
LM285LPRE3-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	Active
LM285Z-2.5/LFT7	National Semiconductor	2.5V	20 mA	±1.5%	150ppm/°C	120µVrms	20 µA	-40°C ~ 85°C	Active
LM285Z-2.5RAG	onsemi	2.5V	20 mA	±1.5%	80ppm/°C	120µVrms	30 µA	-40°C ~ 85°C	Active
LM285Z-2.5RPG	onsemi	2.5V	20 mA	±1.5%	80ppm/°C	120µVrms	30 µA	-40°C ~ 85°C	Active
LM385BLPR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active
LM385BZ-2.5/LFT7	Texas Instruments	2.5V	20 mA	±1.5%	150ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active
LM385LPR-2-5	Texas Instruments	2.5V	20 mA	±3%	20ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active
LM385Z-2.5/LFT1	National Semiconductor	2.5V	20 mA	±3%	150ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active
LM385Z-2.5/LFT2	Texas Instruments	2.5V	20 mA	±3%	150ppm/°C	120µVrms	20 µA	0°C ~ 70°C	Active

Engineering Selection Recommendations

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

LM285LPR-2-5 and LM285LPRE3-2-5 from Texas Instruments are recommended as primary substitutes. Both parts maintain the full operating temperature range of the original ZR285R02STOB, offer improved tolerance specification (±1.5%), and are in active production status with ROHS3 compliance. These parts are electrically and mechanically compatible with existing designs.

LM285Z-2.5/LFT7 from National Semiconductor provides an alternative with full temperature range support and active product status. The higher temperature coefficient (150ppm/°C) versus the original part (90ppm/°C) should be evaluated for temperature-sensitive applications.

LM285Z-2.5RAG and LM285Z-2.5RPG from onsemi both support the full temperature range with ±1.5% tolerance and active status. Note that cathode current is specified at 30 µA versus 20 µA for the original part.

Secondary Substitutes (Reduced Temperature Range 0°C ~ 70°C)

LM385BLPR-2-5 and LM385BZ-2.5/LFT7 from Texas Instruments are suitable only for applications operating within 0°C ~ 70°C. These parts offer active status and ROHS3 compliance but do not support the full -40°C ~ 85°C range of the original part.

LM385LPR-2-5, LM385Z-2.5/LFT1, and LM385Z-2.5/LFT2 are restricted to 0°C ~ 70°C operation and feature ±3% tolerance, matching the original part's tolerance specification. These are suitable only for applications with reduced temperature requirements.

All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can I use LM385 series parts as direct replacements for the ZR285R02STOB?

A: LM385 series parts are electrically compatible substitutes with identical 2.5V output, 20 mA current rating, and TO-92-3 package. However, verify operating temperature requirements. LM385 variants are typically rated 0°C ~ 70°C, while the original part supports -40°C ~ 85°C. Select LM285 series parts if full temperature range is required.

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

A: Both series provide 2.5V shunt voltage references in TO-92-3 packages with 20 mA output current. The primary distinction is operating temperature range: LM285 series supports -40°C ~ 85°C, while LM385 series is typically limited to 0°C ~ 70°C. Tolerance and temperature coefficient specifications vary by specific part number.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance of the original ZR285R02STOB.

Q: Does cathode current variation affect circuit compatibility?

A: The original part specifies 20 µA cathode current. Some substitutes (LM285Z-2.5RAG, LM285Z-2.5RPG) specify 30 µA. This difference should be evaluated in applications with tight current budget constraints, though both values are within typical shunt reference operating parameters.

Q: Which substitute offers the best temperature stability?

A: LM285LPR-2-5 and LM285LPRE3-2-5 from Texas Instruments offer the lowest temperature coefficient at 20ppm/°C typical, compared to the original part's 90ppm/°C. This provides superior temperature stability for precision applications.

Q: Can I substitute parts with different tolerance ratings?

A: Yes, parts with tighter tolerance (±1.5%) are direct substitutes for the ±2% original part. Parts with relaxed tolerance (±3%) are acceptable only if circuit design margins accommodate the wider tolerance band.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message