LP311PSR Equivalent & Substitute Parts

Part Overview

The LP311PSR is a differential comparator IC manufactured by Texas Instruments, housed in an 8-SO surface mount package. This component features open-collector and open-emitter outputs, making it suitable for applications requiring flexible output configurations. The LP311PSR is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The substitute part LP211DR provides functional continuity while offering improved availability and extended operating temperature range.

Substiute Parts

LP311PSR

Texas InstrumentsIn Stock: 1018LP311PSR Datasheet

Current PartRFQ

LP211DR

Texas InstrumentsIn Stock: 3361LP211DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LP211DR qualifies as a direct substitute for the LP311PSR based on the following criteria:

Electrical Parameter Equivalence:

• Identical comparator type (differential)
• Identical number of elements (1)
• Identical output type (open-collector, open-emitter)
• Identical supply voltage range (4.6V ~ 30V, ±1.75V ~ 15V)
• Identical input offset voltage specification (7.5mV @ ±15V)
• Identical input bias current specification (0.1µA @ ±15V)
• Identical quiescent current specification (300µA)

Package and Compliance Equivalence:

• Both use 8-SOIC surface mount packaging
• Both maintain ROHS3 compliance
• Both have MSL rating of 1 (Unlimited)
• Both are REACH unaffected

Availability and Status:

• LP311PSR: Obsolete status, 964 units in stock
• LP211DR: Active status, 3350 units in stock

The primary differences are the extended operating temperature range of LP211DR (-25°C ~ 85°C versus 0°C ~ 70°C) and packaging format (Tape & Reel for LP211DR).

Parameter Comparison

Engineering Selection Recommendations

For New Designs: The LP211DR is the appropriate selection for new circuit designs. As an active product with extended temperature range (-25°C ~ 85°C), it provides superior environmental performance and long-term availability assurance compared to the obsolete LP311PSR.

For Existing Inventory Management: The LP311PSR remains electrically equivalent for applications operating within the 0°C ~ 70°C temperature window. Existing stock (964 units) may be utilized for production runs where temperature specifications do not exceed this range.

For Production Transitions: Migration from LP311PSR to LP211DR is supported by identical electrical specifications. PCB layout modifications may be required due to package pitch differences (0.209" versus 0.154" width). Both parts maintain equivalent compliance certifications (ROHS3, REACH unaffected).

Compliance Considerations: Both parts satisfy ROHS3 compliance requirements and carry unlimited moisture sensitivity ratings (MSL 1), eliminating compliance-related substitution barriers.

Frequently Asked Questions (FAQ)

Q: Can LP211DR directly replace LP311PSR in existing circuits? A: Yes, from an electrical standpoint. Both parts are differential comparators with identical supply voltage ranges, input offset voltage, input bias current, and quiescent current specifications. PCB layout modifications may be necessary due to package pitch differences.

Q: What is the primary difference between these parts? A: The LP211DR offers an extended operating temperature range (-25°C ~ 85°C) compared to the LP311PSR (0°C ~ 70°C). Additionally, LP211DR is an active product with higher inventory availability, while LP311PSR is obsolete.

Q: Are there package compatibility concerns? A: Both use 8-SOIC surface mount packages, but with different pitch specifications. LP311PSR uses 0.209" width while LP211DR uses 0.154" width. PCB footprints must be verified for compatibility before substitution.

Q: Do compliance certifications differ between these parts? A: No. Both parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Which part should be specified for new designs? A: The LP211DR should be specified for all new designs due to its active product status, extended temperature range, and superior long-term availability.

Q: Is the LP211DR available in the same packaging format as LP311PSR? A: LP211DR is supplied in Tape & Reel format, while LP311PSR packaging format is not specified in the provided data. Confirm packaging requirements with your procurement department.