LM285H-1.2 Equivalent & Substitute Parts

Part Overview

The LM285H-1.2 is a shunt voltage reference IC manufactured by Texas Instruments, designed to provide a fixed 1.235V output with ±1% tolerance. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part operates in the -40°C to 85°C temperature range and is packaged in a TO-46-2 metal can configuration for through-hole mounting applications.

Substiute Parts

LM285H-1.2

Texas InstrumentsIn Stock: 1293LM285H-1.2 Datasheet

Current PartRFQ

LM185BYH-1.2/NOPB

Texas InstrumentsIn Stock: 1055LM185BYH-1.2/NOPB Datasheet

MFR RecommendedRFQ

LM285H-1.2

National SemiconductorIn Stock: 1320LM285H-1.2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM285H-1.2 is determined by strict equivalence across the following critical parameters:

• Reference Type: Shunt
• Output Type: Fixed
• Voltage - Output (Min/Fixed): 1.235V
• Current - Output: 20 mA
• Tolerance: ±1%
• Package / Case: TO-46-2 Metal Can
• Mounting Type: Through Hole

Two substitute parts meet these criteria. The LM185BYH-1.2/NOPB is classified as a manufacturer-recommended substitute with active product status and improved temperature coefficient performance. The LM285H-1.2 from National Semiconductor is a parametric equivalent with identical electrical specifications and the same package configuration.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production applications, the LM185BYH-1.2/NOPB is the primary substitute. This part is actively manufactured by Texas Instruments, carries ROHS3 compliance certification, and operates across an extended temperature range of -55°C to 125°C. The temperature coefficient is improved to 50ppm/°C compared to the original 150ppm/°C specification. All critical electrical parameters remain equivalent to the LM285H-1.2.

The LM285H-1.2 from National Semiconductor serves as a parametric equivalent with identical electrical specifications and temperature range. This part maintains active product status and is suitable for direct replacement in applications where the original temperature coefficient of 150ppm/°C is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the LM185BYH-1.2/NOPB be used as a direct replacement for the LM285H-1.2?

A: Yes. Both parts are shunt voltage references with fixed 1.235V output, ±1% tolerance, 20 mA output current, and identical TO-46-2 metal can packaging. The LM185BYH-1.2/NOPB offers improved temperature coefficient performance and extended operating temperature range.

Q: What is the difference between the LM185BYH-1.2/NOPB and the National Semiconductor LM285H-1.2?

A: The LM185BYH-1.2/NOPB has a temperature coefficient of 50ppm/°C and operating range of -55°C to 125°C with ROHS3 compliance. The National Semiconductor LM285H-1.2 maintains the original 150ppm/°C temperature coefficient and -40°C to 85°C operating range.

Q: Are there any package or mounting differences between these parts?

A: No. All three parts use TO-46-2 metal can packaging with through-hole mounting configuration. Pin compatibility and board layout remain unchanged.

Q: Why is the original LM285H-1.2 from Texas Instruments marked as obsolete?

A: The part has been discontinued by the manufacturer. The LM185BYH-1.2/NOPB is the active replacement offering improved specifications and regulatory compliance.

Q: Which substitute should be selected for applications requiring extended temperature operation?

A: The LM185BYH-1.2/NOPB supports -55°C to 125°C operation, providing wider temperature coverage than both the original LM285H-1.2 and the National Semiconductor equivalent.