LM285Z-2.5RAG Equivalent & Substitute Parts

Part Overview

The LM285Z-2.5RAG is a shunt voltage reference IC manufactured by onsemi, providing a fixed 2.5V output with ±1.5% tolerance. This Through Hole mounted component operates across the industrial temperature range of -40°C to 85°C and is classified as Active product status. Shunt voltage references are essential in precision analog circuits requiring stable reference voltages for data acquisition, instrumentation, and power management applications. Substitute parts are identified to address inventory availability, packaging preferences, or specific performance requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±1.5%
Temperature Coefficient	80ppm/°C Typical
Noise - 10Hz to 10kHz	120µVrms
Current - Cathode	30 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 is determined by strict alignment with 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) Through Hole
Reference Type: Must be Shunt
Output Type: Must be Fixed
Operating Temperature Range: Must support -40°C to 85°C minimum
Tolerance: ±1.5% or better (lower tolerance values are acceptable)
Compliance: ROHS3 Compliant, REACH Unaffected

Substitute parts are grouped into two categories:

Direct Substitutes maintain all critical electrical parameters and operating temperature range, enabling pin-for-pin replacement without circuit modification.

Similar Substitutes meet core electrical specifications but may have variations in temperature coefficient, cathode current, operating temperature range, or packaging format. These require design review to confirm compatibility with application requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coeff	Cathode Current	Temp Range	Package	Packaging Type
LM285Z-2.5RAG	onsemi	2.5V	20 mA	±1.5%	80ppm/°C	30 µA	-40°C ~ 85°C	TO-92-3	Cut Tape (CT)
LM285LPR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	20 µA	-40°C ~ 85°C	TO-92-3	Cut Tape (CT)
LM285LP-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	20 µA	-40°C ~ 85°C	TO-92-3	Bulk
LM285LPE3-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	20 µA	-40°C ~ 85°C	TO-92-3	Bulk
LM285LPRE3-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	20 µA	-40°C ~ 85°C	TO-92-3	Cut Tape (CT)
LM285Z-2.5#TRPBF	Analog Devices Inc.	2.5V	20 mA	±1.5%	20ppm/°C	20 µA	-40°C ~ 85°C	TO-92-3	Tape & Reel (TR)
LM285Z-2.5/LFT7	National Semiconductor	2.5V	20 mA	±1.5%	150ppm/°C	20 µA	-40°C ~ 85°C	TO-92-3	Bulk
LM385BZ-2.5/LFT7	Texas Instruments	2.5V	20 mA	±1.5%	150ppm/°C	20 µA	0°C ~ 70°C	TO-92-3	Cut Tape (CT)
LM385Z-2.5/LFT1	National Semiconductor	2.5V	20 mA	±3%	150ppm/°C	20 µA	0°C ~ 70°C	TO-92-3	Bulk
LM385Z-2.5/LFT2	Texas Instruments	2.5V	20 mA	±3%	150ppm/°C	20 µA	0°C ~ 70°C	TO-92-3	Cut Tape (CT)
LT1004CZ-2.5#TRPBF	Analog Devices Inc.	2.5V	20 mA	±0.8%	20ppm/°C	20 µA	0°C ~ 70°C	TO-92-3	Cut Tape (CT)

Engineering Selection Recommendations

Direct Substitutes (Pin-for-Pin Compatible):

LM285LPR-2-5, LM285LP-2-5, LM285LPE3-2-5, and LM285LPRE3-2-5 from Texas Instruments are direct electrical equivalents. All maintain the -40°C to 85°C operating temperature range, ±1.5% tolerance, and 2.5V fixed output. These parts offer improved temperature coefficient performance (20ppm/°C vs. 80ppm/°C) and lower cathode current (20 µA vs. 30 µA), resulting in reduced power consumption. Selection among these variants depends on packaging preference: Cut Tape (CT) for automated assembly or Bulk for manual handling.

LM285Z-2.5#TRPBF from Analog Devices Inc. is electrically equivalent with identical tolerance and temperature range. Tape & Reel packaging is optimized for high-volume production environments.

Similar Substitutes (Design Review Required):

LM285Z-2.5/LFT7 from National Semiconductor meets all core electrical specifications and temperature range but exhibits higher temperature coefficient (150ppm/°C). This part is suitable for applications where temperature stability is less critical.

LM385BZ-2.5/LFT7 and LM385Z-2.5/LFT2 from Texas Instruments operate within a reduced temperature range (0°C to 70°C), limiting use to commercial-grade applications. LM385Z-2.5/LFT2 additionally specifies ±3% tolerance, requiring circuit validation for tolerance-sensitive designs.

LM385Z-2.5/LFT1 from National Semiconductor combines reduced temperature range (0°C to 70°C) with ±3% tolerance, making it suitable only for non-critical commercial applications.

LT1004CZ-2.5#TRPBF from Analog Devices Inc. offers superior tolerance (±0.8%) but operates within 0°C to 70°C range. This part is appropriate for precision applications within commercial temperature limits.

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can LM285LPR-2-5 replace LM285Z-2.5RAG directly?

A: Yes. Both parts share identical output voltage (2.5V), current (20 mA), tolerance (±1.5%), and operating temperature range (-40°C to 85°C). The LM285LPR-2-5 offers superior temperature coefficient (20ppm/°C vs. 80ppm/°C) and lower cathode current, making it a direct pin-for-pin substitute without circuit modification.

Q: What is the difference between Cut Tape and Bulk packaging?

A: Cut Tape (CT) packaging is pre-cut and ready for automated pick-and-place assembly equipment. Bulk packaging contains loose components suitable for manual assembly or reel-feeding systems. Electrical performance is identical; packaging choice depends on assembly process requirements.

Q: Why do some substitutes have different temperature coefficients?

A: Temperature coefficient indicates how much the output voltage changes with temperature. Lower values (20ppm/°C) provide better stability across temperature extremes. Higher values (150ppm/°C) are acceptable in applications where temperature variation is minimal or where output voltage drift is tolerable.

Q: Can I use LM385Z-2.5/LFT1 in place of LM285Z-2.5RAG?

A: No. LM385Z-2.5/LFT1 has two critical limitations: operating temperature range restricted to 0°C to 70°C (vs. -40°C to 85°C required) and tolerance of ±3% (vs. ±1.5% required). Use only if your application operates within 0°C to 70°C and tolerates ±3% output variation.

Q: Is LT1004CZ-2.5#TRPBF suitable for industrial temperature applications?

A: No. LT1004CZ-2.5#TRPBF operates within 0°C to 70°C, limiting it to commercial-grade applications. For industrial temperature range (-40°C to 85°C), use LM285LPR-2-5, LM285LP-2-5, LM285LPE3-2-5, LM285LPRE3-2-5, or LM285Z-2.5#TRPBF.

Q: What does ±0.8% tolerance mean compared to ±1.5%?

A: ±0.8% tolerance (LT1004CZ-2.5#TRPBF) indicates tighter output voltage control, with maximum deviation of ±0.2V from 2.5V nominal. ±1.5% tolerance allows ±0.0375V deviation. Tighter tolerance is beneficial for precision circuits but may not be necessary for general-purpose applications.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original LM285Z-2.5RAG component.

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