LM285DR-1-2 Equivalent & Substitute Parts

Part Overview

The LM285DR-1-2 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring fixed 1.235V output. This component operates as a micropower voltage reference with ±1% tolerance and is packaged in 8-SOIC surface mount configuration. The part is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Substitute parts are necessary to ensure supply chain flexibility, accommodate different packaging requirements, and maintain design specifications across production runs.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM285DR-1-2
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±1%
Temperature Coefficient	20ppm/°C Typical
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	10 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM285DR-1-2 is determined by strict equivalence across the following critical parameters:

Core Electrical Parameters (Must Match):

Reference Type: Shunt
Output Type: Fixed
Voltage - Output: 1.235V
Current - Output: 20 mA
Tolerance: ±1%
Noise - 10Hz to 10kHz: 60µVrms
Current - Cathode: 10 µA
Package / Case: 8-SOIC (0.154", 3.90mm Width)

Allowable Variations:

Temperature Coefficient: May vary (20ppm/°C to 150ppm/°C acceptable for general applications)
Operating Temperature Range: Extended range (-40°C ~ 85°C) preferred; narrower range (0°C ~ 70°C) acceptable for limited temperature applications
Packaging Format: Cut Tape (CT), Tube, or Tape & Reel (TR) formats are interchangeable based on assembly requirements
Product Status: Active status preferred; Last Time Buy acceptable for existing designs

Substitute parts are grouped by packaging format and temperature coefficient performance tier. Parts with identical electrical specifications but different packaging formats enable procurement flexibility. Parts with higher temperature coefficients (50ppm/°C to 150ppm/°C) are suitable for applications where thermal stability requirements are less stringent than the original specification.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Package	Packaging Format	Product Status
LM285DR-1-2	Texas Instruments	1.235V	20 mA	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Cut Tape (CT)	Last Time Buy
LM285BXM-1.2/NOPB	National Semiconductor	1.235V	20 mA	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Bulk	Active
LM285BXMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Tape & Reel (TR)	Active
LM285BYM-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Tube	Active
LM285BYMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Tape & Reel (TR)	Active
LM285M-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Tube	Active
LM285MX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Cut Tape (CT)	Active
LM385BM-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Tube	Active
LM385BMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)	Active
LM385M-1.2/NOPB	Texas Instruments	1.235V	20 mA	-2.43%, +2.02%	150ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Tube	Active
LM385MX-1.2/NOPB	Texas Instruments	1.235V	20 mA	-2.43%, +2.02%	150ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Preferred): LM285BXM-1.2/NOPB and LM285BXMX-1.2/NOPB maintain identical electrical specifications to the LM285DR-1-2 with extended operating temperature range (-40°C ~ 85°C). Both parts are Active status and ROHS3 compliant. LM285BXMX-1.2/NOPB in Tape & Reel format is recommended for high-volume production; LM285BXM-1.2/NOPB in Bulk format is suitable for lower-volume applications.

Tier 2 - Acceptable Substitutes (Temperature Coefficient Variation): LM285BYM-1.2/NOPB, LM285BYMX-1.2/NOPB, LM285M-1.2/NOPB, and LM285MX-1.2/NOPB are electrically equivalent with higher temperature coefficients (50ppm/°C to 150ppm/°C). These parts maintain the full -40°C ~ 85°C operating range and are suitable for applications where thermal drift is not a critical design constraint. All are Active status and ROHS3 compliant.

Tier 3 - Limited Substitutes (Temperature Range and Tolerance Variation): LM385BM-1.2/NOPB, LM385BMX-1.2/NOPB, LM385M-1.2/NOPB, and LM385MX-1.2/NOPB operate within a narrower temperature range (0°C ~ 70°C) and exhibit higher cathode current (15 µA versus 10 µA). LM385M-1.2/NOPB and LM385MX-1.2/NOPB have asymmetric tolerance (-2.43%, +2.02%) rather than ±1%. These parts are suitable only for applications with restricted operating temperature requirements and where tolerance asymmetry is acceptable.

All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) rating, ensuring compatibility with standard assembly processes.

Frequently Asked Questions (FAQ)

Q: Can LM285M-1.2/NOPB replace LM285DR-1-2 in my design? A: Yes, LM285M-1.2/NOPB is electrically equivalent with identical output voltage, current, and tolerance specifications. The primary difference is temperature coefficient (150ppm/°C versus 20ppm/°C). If your circuit operates within -40°C ~ 85°C and thermal drift is not a critical parameter, this substitution is valid. Verify thermal performance through circuit simulation if temperature stability is essential.

Q: What is the difference between Cut Tape (CT), Tube, and Tape & Reel (TR) packaging? A: These are packaging formats for the same component. Cut Tape is supplied on continuous tape cut to specified lengths. Tube packaging contains loose components in a plastic tube. Tape & Reel is continuous tape wound on a reel for automated assembly. All three formats contain identical die and electrical performance; selection depends on assembly equipment and volume requirements.

Q: Why do some substitutes have different cathode current specifications? A: LM385 series parts specify 15 µA cathode current compared to 10 µA for LM285 series. This difference reflects manufacturing process variations between product lines. For most applications, this variation is negligible. Verify cathode current requirements in your circuit design before substitution.

Q: Can I use LM385M-1.2/NOPB with asymmetric tolerance in a precision application? A: LM385M-1.2/NOPB has -2.43%, +2.02% tolerance versus the ±1% specification of LM285DR-1-2. This asymmetric tolerance may affect circuit performance in precision applications. Use this part only if your design accommodates the wider and asymmetric tolerance band.

Q: Is LM285DR-1-2 still available for new designs? A: LM285DR-1-2 is in Last Time Buy status, indicating limited availability. For new designs, select from Active status alternatives such as LM285BXMX-1.2/NOPB or LM285MX-1.2/NOPB to ensure long-term supply continuity.

Q: What is the operating temperature range difference between LM285 and LM385 series? A: LM285 series operates -40°C ~ 85°C (extended industrial range). LM385 series operates 0°C ~ 70°C (commercial range). LM285 series is suitable for wider temperature applications; LM385 series is restricted to commercial temperature environments.

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