LM393APSR Equivalent & Substitute Parts

Part Overview

The LM393APSR 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 is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and new project implementations where active alternatives are required.

Substiute Parts

LM393APSR

Texas InstrumentsIn Stock: 1577LM393APSR Datasheet

Current PartRFQ

LM393ADR

UMWIn Stock: 105195LM393ADR Datasheet

MFR RecommendedRFQ

LM393M/NOPB

Texas InstrumentsIn Stock: 5485LM393M/NOPB Datasheet

MFR RecommendedRFQ

LM393MX/NOPB

Texas InstrumentsIn Stock: 82736LM393MX/NOPB Datasheet

MFR RecommendedRFQ

LM2903DT

STMicroelectronicsIn Stock: 85492LM2903DT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM393APSR is determined by the following critical parameters:

• Dual comparator configuration (2 elements)
• Open-collector, rail-to-rail output topology
• Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
• 8-pin SOIC surface mount package
• General-purpose comparator classification
• ROHS3 compliance and MSL Level 1 rating

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in input offset voltage, input bias current, output current, quiescent current, and operating temperature range do not disqualify substitution when the primary functional parameters remain compatible.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts—LM393ADR, LM393M/NOPB, LM393MX/NOPB, and LM2903DT—are classified as Active products, ensuring ongoing availability and manufacturing support. This contrasts with the LM393APSR's Last Time Buy status.

For applications requiring strict adherence to the original 0°C ~ 70°C operating temperature range, LM393ADR, LM393M/NOPB, and LM393MX/NOPB maintain identical specifications. The LM2903DT extends the operating range to -40°C ~ 125°C, suitable for industrial and automotive environments where wider temperature performance is required.

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard PCB assembly processes and long-term storage without moisture sensitivity concerns.

The LM393ADR and LM393MX/NOPB offer superior quiescent current performance (1mA and 2.5mA respectively) compared to the original part's 2.5mA specification, providing potential power consumption benefits in battery-powered applications.

Frequently Asked Questions (FAQ)

Q: Can LM393ADR be used as a direct replacement for LM393APSR?

A: Yes. Both devices feature identical electrical specifications for supply voltage range, output type, and general-purpose comparator functionality. The primary difference is packaging width (3.90mm vs. 5.30mm), which requires PCB layout verification to ensure footprint compatibility.

Q: What is the significance of the package width difference between LM393APSR and substitute parts?

A: The LM393APSR uses an 8-SOIC package with 0.209" (5.30mm) width, while LM393ADR, LM393M/NOPB, LM393MX/NOPB, and LM2903DT use 8-SOIC packages with 0.154" (3.90mm) width. This difference affects PCB footprint dimensions and requires design verification before implementation.

Q: Why is LM2903DT listed as a substitute despite different operating temperature range?

A: The LM2903DT maintains all critical electrical parameters: dual comparator configuration, open-collector rail-to-rail output, and 2V ~ 36V supply voltage range. The extended operating temperature (-40°C ~ 125°C) represents a superset of the original 0°C ~ 70°C range, making it suitable for applications requiring broader temperature performance without compromising original specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts—LM393ADR, LM393M/NOPB, LM393MX/NOPB, and LM2903DT—are ROHS3 compliant with MSL Level 1 rating, meeting standard environmental and reliability requirements for modern electronics manufacturing.

Q: What is the difference between LM393M/NOPB and LM393MX/NOPB?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications. The primary difference is packaging format: LM393M/NOPB is supplied in Tube packaging, while LM393MX/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on procurement and assembly process requirements.

Q: Can substitute parts be used in existing designs without PCB modification?

A: Electrical substitution is direct. However, the package width difference (5.30mm original vs. 3.90mm substitutes) requires PCB footprint verification. If the original PCB was designed for the 5.30mm width, physical placement may require layout adjustment or use of adapter solutions.