LM393PSR Equivalent & Substitute Parts

Part Overview

The LM393PSR is a general-purpose dual comparator IC manufactured by Texas Instruments, featuring open-collector, rail-to-rail output configuration in an 8-SO surface mount package. This device operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), making it suitable for analog signal comparison applications across industrial and consumer electronics.

The LM393PSR is currently in Last Time Buy status, indicating that Texas Instruments has discontinued this part number for new designs. Identifying functionally equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for existing applications or new designs requiring comparable performance characteristics.

Substiute Parts

LM393PSR

Texas InstrumentsIn Stock: 21382LM393PSR Datasheet

Current PartRFQ

LM393DR

Rohm SemiconductorIn Stock: 330302LM393DR Datasheet

MFR RecommendedRFQ

LM393M/NOPB

Texas InstrumentsIn Stock: 5485LM393M/NOPB Datasheet

MFR RecommendedRFQ

BA2903YF-CE2

Rohm SemiconductorIn Stock: 5115BA2903YF-CE2 Datasheet

MFR RecommendedRFQ

LM2903DT

STMicroelectronicsIn Stock: 85492LM2903DT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM393PSR are selected based on the following critical parameters that determine functional equivalence:

• Dual comparator configuration (2 elements per package)
• Open-collector output topology with rail-to-rail capability
• Supply voltage range compatibility (2V ~ 36V single, ±1V ~ ±18V dual)
• Input offset voltage specifications (maximum 7mV acceptable)
• Input bias current (0.25µA maximum)
• Output current capability (minimum 6mA typical)
• Quiescent current (2.5mA maximum)
• Operating temperature range (0°C minimum to 70°C minimum)
• 8-pin SOIC surface mount package with compatible pinout
• RoHS3 compliance and REACH unaffected status

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring pin-compatible operation within existing circuit designs. Variations in package width (3.90mm vs 5.30mm) and propagation delay characteristics do not affect functional substitution for general-purpose comparator applications.

Parameter Comparison

Engineering Selection Recommendations

LM393M/NOPB (Texas Instruments, Active Status) is the primary recommended substitute for the LM393PSR. This part maintains identical electrical specifications including input offset voltage (5mV @ 30V), supply voltage range, and quiescent current. As an active product from the original manufacturer, it ensures long-term availability and design continuity. The packaging format (Tube) differs from the original Tape & Reel, but the 8-SOIC footprint remains compatible.

LM2903DT (STMicroelectronics, Active Status) provides an alternative from a different manufacturer with extended operating temperature range (-40°C ~ 125°C). This part meets all core electrical requirements and offers superior temperature performance for applications requiring operation beyond the standard 0°C ~ 70°C range.

BA2903YF-CE2 (Rohm Semiconductor, Active Status) is suitable for automotive-grade applications, carrying AEC-Q100 qualification. This part features the lowest quiescent current (1mA) and excellent input offset voltage (4mV @ 5V), making it optimal for power-sensitive designs. The extended temperature range (-40°C ~ 125°C) supports demanding environmental conditions.

LM393DR (Rohm Semiconductor, Not For New Designs) is functionally compatible but carries a "Not For New Designs" status, limiting its suitability for new development projects despite adequate electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM393PSR with LM393M/NOPB on my PCB?

A: Yes. Both parts use the 8-SOIC pinout and are electrically equivalent. The primary difference is packaging format (Tube vs. Tape & Reel), which does not affect circuit operation. PCB footprints are compatible.

Q: What is the difference between LM393PSR and LM2903DT?

A: Both are dual comparators with identical supply voltage ranges and input bias current specifications. LM2903DT offers extended operating temperature range (-40°C ~ 125°C vs. 0°C ~ 70°C) and is manufactured by STMicroelectronics. Output current capability is slightly lower (16mA vs. 20mA typical), which is acceptable for most general-purpose applications.

Q: Why does BA2903YF-CE2 have lower quiescent current?

A: BA2903YF-CE2 is optimized for automotive applications with AEC-Q100 qualification. The 1mA quiescent current (vs. 2.5mA in LM393PSR) reflects design optimization for power efficiency in automotive systems. This characteristic makes it suitable for battery-powered or low-power applications.

Q: Are there package compatibility concerns between these substitutes?

A: All substitute parts use 8-SOIC surface mount packages with identical pinouts. Package width variations (3.90mm to 5.30mm) do not affect PCB footprint compatibility. Standard 8-SOIC land patterns accommodate all listed parts.

Q: Which substitute should I choose for a new design?

A: LM393M/NOPB is recommended for new designs due to its Active product status from Texas Instruments and identical electrical specifications to the original LM393PSR. LM2903DT is preferred if extended temperature range is required. BA2903YF-CE2 is optimal for automotive applications requiring AEC-Q100 qualification.

Q: Is RoHS3 compliance maintained across all substitutes?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, maintaining environmental regulatory compliance equivalent to the original LM393PSR.