LM285D-1.2R2 Equivalent & Substitute Parts

Part Overview

The LM285D-1.2R2 is a shunt voltage reference IC manufactured by onsemi, providing a fixed 1.235V output with ±1% tolerance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LM285D-1.2R2 operates across the industrial temperature range of -40°C to 85°C and is packaged in an 8-SOIC surface mount configuration. Substitute parts must maintain electrical equivalence in output voltage, current specifications, and thermal characteristics while meeting modern compliance requirements.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±1%
Temperature Coefficient	80ppm/°C Typical
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	20 µA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM285D-1.2R2 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 1.235V fixed
Output current: 20 mA
Tolerance: ±1%
Noise specification: 60µVrms (10Hz to 10kHz)
Operating temperature range: -40°C to 85°C
Package: 8-SOIC surface mount
Cathode current: 10-20 µA acceptable range

Acceptable Variations:

Temperature coefficient: 20-150ppm/°C (all substitutes meet thermal stability requirements)
Packaging format: Tape & Reel, Cut Tape, Tube, or Bulk acceptable for equivalent electrical function
Manufacturer: onsemi, Texas Instruments, or National Semiconductor

Substitutes are grouped into two categories: Direct Manufacturer Equivalents (identical part number variants with different packaging) and Similar Manufacturer Parts (equivalent electrical specifications with different temperature coefficients or packaging).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff (ppm/°C)	Cathode Current (µA)	Packaging	Product Status	RoHS Status
LM285D-1.2R2	onsemi	1.235V	20 mA	±1%	80 Typical	20	Tube	Obsolete	Non-compliant
LM285D-1.2R2G	onsemi	1.235V	20 mA	±1%	80 Typical	20	Tape & Reel	Active	ROHS3 Compliant
LM285BYMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	50	10	Tape & Reel	Active	ROHS3 Compliant
LM285DR-1-2	Texas Instruments	1.235V	20 mA	±1%	20 Typical	10	Cut Tape & Digi-Reel	Last Time Buy	ROHS3 Compliant
LM285M-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150	10	Tube	Active	ROHS3 Compliant
LM285MX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150	10	Cut Tape & Digi-Reel	Active	ROHS3 Compliant
LM285BXM-1.2/NOPB	National Semiconductor	1.235V	20 mA	±1%	30	10	Bulk	Active	Not specified
LM285BXMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	30	10	Tape & Reel	Active	ROHS3 Compliant
LM285BYM-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	50	10	Tube	Active	ROHS3 Compliant
LM285D-1-2	Texas Instruments	1.235V	20 mA	±1%	20 Typical	10	Tube	Last Time Buy	ROHS3 Compliant
LM285DG4-1-2	Texas Instruments	1.235V	20 mA	±1%	20 Typical	10	Tube	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LM285D-1.2R2G This onsemi part is the direct equivalent to the obsolete LM285D-1.2R2, differing only in packaging format (Tape & Reel vs. Tube). It maintains identical electrical specifications and is currently in active production status with ROHS3 compliance. This part provides the most direct replacement path with no design changes required.

Secondary Recommendations (Texas Instruments):

LM285DR-1-2 or LM285D-1-2: Both offer superior temperature coefficient performance (20ppm/°C vs. 80ppm/°C), resulting in improved output voltage stability across the operating temperature range. LM285DR-1-2 is available in Cut Tape & Digi-Reel format; LM285D-1-2 is available in Tube format. Both carry Last Time Buy status.
LM285BXMX-1.2/NOPB: Offers improved temperature coefficient (30ppm/°C) with active product status and ROHS3 compliance. Available in Tape & Reel packaging.

Alternative Options (Active Production):

LM285M-1.2/NOPB or LM285MX-1.2/NOPB: Both maintain active production status with ROHS3 compliance. Temperature coefficient is 150ppm/°C, which is higher than the original part but remains within acceptable limits for most applications. Available in Tube or Cut Tape formats respectively.
LM285BYM-1.2/NOPB or LM285BYMX-1.2/NOPB: Both offer 50ppm/°C temperature coefficient with active status and ROHS3 compliance. Available in Tube or Tape & Reel formats.

Compliance Consideration: All recommended substitutes except LM285BXM-1.2/NOPB are ROHS3 compliant. The original LM285D-1.2R2 is RoHS non-compliant; migration to compliant alternatives is recommended for new designs and long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM285D-1.2R2 with LM285D-1.2R2G? A: Yes. These parts are electrically identical. The only difference is packaging format: LM285D-1.2R2 is supplied in Tube format, while LM285D-1.2R2G is supplied in Tape & Reel format. Both are 8-SOIC surface mount packages with identical pinouts and electrical characteristics.

Q: What is the significance of the temperature coefficient differences among substitutes? A: Temperature coefficient indicates how much the output voltage changes with temperature. The original LM285D-1.2R2 has 80ppm/°C. Substitutes with lower coefficients (20-50ppm/°C) provide better voltage stability across the -40°C to 85°C operating range. Higher coefficients (150ppm/°C) are acceptable but result in greater voltage drift. Selection depends on application tolerance requirements.

Q: Are all substitutes pin-compatible with the original part? A: Yes. All listed substitutes use the 8-SOIC package with identical pinout and electrical function. No PCB layout changes are required for substitution.

Q: Why do some parts show "Last Time Buy" status? A: Last Time Buy status indicates the manufacturer will discontinue production after a specified date. Parts with this status should be used only if immediate availability is critical. For new designs, select parts with Active status for long-term supply assurance.

Q: What is the difference between packaging formats (Tube, Tape & Reel, Cut Tape)? A: These are supply formats only and do not affect electrical performance. Tube packaging is for manual handling; Tape & Reel is for automated assembly; Cut Tape & Digi-Reel is for semi-automated processes. Selection depends on manufacturing equipment and volume requirements.

Q: Is RoHS3 compliance mandatory for my application? A: RoHS3 compliance is required for products sold in the European Union and many other markets. If your application requires RoHS compliance, avoid LM285BXM-1.2/NOPB, which does not specify compliance status. All other listed substitutes are ROHS3 compliant.

Q: Can I use parts with different cathode current specifications? A: Yes. The original part specifies 20µA cathode current; substitutes specify 10µA. This difference does not affect circuit operation. Lower cathode current in substitutes represents improved efficiency and is fully compatible with existing designs.

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