LM185H-1.2 Equivalent & Substitute Parts

Part Overview

The LM185H-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, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates as a micropower voltage reference suitable for precision analog applications requiring stable reference voltages in the 1.2V range.

Substiute Parts

LM185H-1.2

Texas InstrumentsIn Stock: 2279LM185H-1.2 Datasheet

Current PartRFQ

LM185H-1.2/NOPB

National SemiconductorIn Stock: 6071LM185H-1.2/NOPB Datasheet

DirectRFQ

LM285LP-1-2

Texas InstrumentsIn Stock: 1853LM285LP-1-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM185H-1.2 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• 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
• Mounting Type: Through Hole

Allowable Variations:

• Temperature Coefficient: May vary (150ppm/°C to 20ppm/°C typical)
• Operating Temperature Range: May be narrower than original
• Package / Case: Alternative through-hole packages acceptable
• Product Status: Active status preferred for availability

Parameter Comparison

Engineering Selection Recommendations

LM185H-1.2/NOPB is the direct equivalent substitute. This part maintains identical electrical specifications and package configuration while offering active product status and improved availability. The NOPB designation indicates lead-free plating, providing better long-term reliability for storage and handling.

LM285LP-1-2 is the manufacturer-recommended alternative. This part meets all critical electrical parameters but operates within a narrower temperature range (-40°C ~ 85°C versus -55°C ~ 125°C) and uses a different package (TO-92-3 instead of TO-46-2 Metal Can). The LM285LP-1-2 offers superior temperature coefficient performance (20ppm/°C typical versus 150ppm/°C) and ROHS3 compliance, making it suitable for applications where the reduced operating temperature range is acceptable and modern compliance requirements are mandated.

Frequently Asked Questions (FAQ)

Q: Can LM185H-1.2/NOPB be used as a direct replacement for LM185H-1.2?

A: Yes. The LM185H-1.2/NOPB is electrically and mechanically identical to the original part, with the same TO-46-2 Metal Can package and all electrical specifications. The primary difference is active product status and lead-free plating.

Q: What are the key differences between LM185H-1.2 and LM285LP-1-2?

A: Both parts provide identical output voltage (1.235V), tolerance (±1%), and output current (20 mA). The LM285LP-1-2 features a superior temperature coefficient (20ppm/°C typical versus 150ppm/°C), operates within a narrower temperature range (-40°C ~ 85°C versus -55°C ~ 125°C), and uses a TO-92-3 package instead of TO-46-2 Metal Can. The LM285LP-1-2 is ROHS3 compliant.

Q: Is the package difference between TO-46-2 and TO-92-3 significant for substitution?

A: Yes. Both are through-hole packages, but they have different physical dimensions and pin configurations. PCB layout modifications are required when switching between these packages. Verify footprint compatibility before selecting LM285LP-1-2 as a substitute.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application requirements. For designs requiring the full -55°C ~ 125°C temperature range and TO-46-2 package compatibility, use LM185H-1.2/NOPB. For applications operating within -40°C ~ 85°C with modern compliance requirements, LM285LP-1-2 offers superior temperature stability and ROHS3 compliance.

Q: Are there any compliance considerations when substituting these parts?

A: The original LM185H-1.2 is RoHS non-compliant. LM285LP-1-2 is ROHS3 compliant, making it suitable for applications with regulatory compliance requirements. Verify compliance requirements for your specific application before final part selection.