LM385DR-1-2 Equivalent & Substitute Parts

Part Overview

The LM385DR-1-2 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications in power management circuits. This fixed 1.235V reference device operates with ±2% tolerance and delivers 20 mA output current in an 8-SOIC surface mount package. The part is classified as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and accommodate evolving manufacturing availability.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±2%
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	15 µA
Operating Temperature	0°C ~ 70°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 LM385DR-1-2 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Criteria:

Reference Type: Shunt (fixed requirement)
Output Voltage: 1.235V (fixed requirement)
Output Current: 20 mA (fixed requirement)
Package / Case: 8-SOIC (0.154", 3.90mm Width) (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)

Allowable Parameter Variations:

Tolerance: ±2% or better (±1% acceptable as improvement)
Temperature Coefficient: May vary (20ppm/°C to 150ppm/°C range acceptable)
Cathode Current: 10 µA to 15 µA acceptable
Operating Temperature Range: Extended ranges (-40°C ~ 85°C) acceptable for applications within 0°C ~ 70°C
Packaging Format: Tape & Reel (TR), Tube, Bulk, or Cut Tape (CT) acceptable for equivalent function

Substitute parts are grouped into two categories: LM285 series (National Semiconductor and Texas Instruments) and LM385 series (Texas Instruments). Both series maintain identical output voltage, current, and package specifications while offering improved tolerance and extended temperature ranges in active product status.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Package	Product Status
LM385DR-1-2	Texas Instruments	1.235V	20 mA	±2%	20ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Last Time Buy
LM285BXM-1.2/NOPB	National Semiconductor	1.235V	20 mA	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active
LM285BXMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active
LM285BYM-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active
LM285BYMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active
LM285M-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active
LM285MX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active
LM385BM-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Active
LM385BMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Active
LM385BXM-1.2/NOPB	National Semiconductor	1.235V	20 mA	±1%	30ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Active
LM385BXMX-1.2/NOPB	National Semiconductor	1.235V	20 mA	±1%	30ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Active

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the LM385DR-1-2 within the specified 8-SOIC package format. Selection should be based on product status and compliance requirements:

Active Product Status: All substitute parts listed carry Active product status, ensuring long-term availability and manufacturing continuity compared to the Last Time Buy status of the LM385DR-1-2.

Tolerance Improvement: Substitute parts offer ±1% tolerance versus the ±2% tolerance of the main part, providing enhanced voltage reference accuracy for precision applications.

Temperature Range: Substitute parts with extended operating temperature ranges (-40°C ~ 85°C) are suitable for applications requiring operation beyond the 0°C ~ 70°C range of the LM385DR-1-2.

Compliance: All parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with modern manufacturing and storage requirements.

Packaging Format Selection: Choose packaging format based on assembly requirements: Tape & Reel (TR) for automated pick-and-place assembly, Tube for manual handling, Bulk for high-volume applications, or Cut Tape (CT) for mixed-volume production.

Frequently Asked Questions (FAQ)

Q: Can LM285 series parts directly replace LM385DR-1-2? A: Yes. Both LM285 and LM385 series maintain identical output voltage (1.235V), output current (20 mA), and 8-SOIC package specifications. The primary differences are tolerance (±1% vs ±2%), temperature coefficient, and operating temperature range. LM285 series parts are suitable for applications within the 0°C ~ 70°C operating range of the original part.

Q: What is the difference between Tape & Reel, Tube, and Bulk packaging? A: Tape & Reel (TR) packaging is optimized for automated assembly lines with pick-and-place equipment. Tube packaging is suitable for manual assembly and smaller production volumes. Bulk packaging is used for high-volume applications where components are handled in larger quantities. All three formats contain identical components in the same 8-SOIC package.

Q: Are there temperature range limitations when substituting? A: The LM385DR-1-2 operates from 0°C ~ 70°C. Substitute parts with extended ranges (-40°C ~ 85°C) are fully compatible for applications within this original range. If your application requires operation outside 0°C ~ 70°C, select substitute parts with extended temperature specifications.

Q: What does ±1% tolerance mean compared to ±2%? A: Tolerance specifies the accuracy of the output voltage. ±2% tolerance means the output voltage can vary by up to 2% from the nominal 1.235V value. ±1% tolerance provides tighter accuracy, with variation limited to 1% of the nominal value. For precision voltage reference applications, ±1% tolerance substitute parts offer improved performance.

Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), meeting current environmental and manufacturing standards.

Q: What is the significance of cathode current specifications? A: Cathode current (10 µA or 15 µA) represents the minimum operating current required for proper device operation. Both values are acceptable for the 1.235V fixed reference function. Lower cathode current (10 µA) in some substitute parts may provide reduced power consumption in certain circuit configurations.

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