LM393PS Equivalent & Substitute Parts

Part Overview

The LM393PS is a general-purpose dual comparator IC manufactured by Texas Instruments, housed in an 8-SO surface mount package. This device features open-collector, rail-to-rail output configuration with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The LM393PS is currently in Last Time Buy status, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

LM393PS

Texas InstrumentsIn Stock: 2079LM393PS Datasheet

Current PartRFQ

LM393DR

Rohm SemiconductorIn Stock: 330302LM393DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM393PS is determined by strict equivalence across the following critical parameters:

Functional Requirements:

• Dual comparator configuration (2 elements)
• General-purpose comparator type
• Open-collector, rail-to-rail output topology
• Supply voltage range: 2V ~ 36V (single) or ±1V ~ ±18V (dual)

Electrical Performance Boundaries:

• Input offset voltage maximum: 5mV to 7mV range
• Input bias current maximum: 0.25µA @ 5V
• Quiescent current maximum: 2.5mA
• Output current capability: 6mA to 20mA typical

Physical & Compliance Requirements:

• Surface mount 8-SOIC package format
• ROHS3 compliance
• MSL Level 1 (Unlimited)
• REACH Unaffected status

The LM393DR from Rohm Semiconductor meets all functional and electrical parameters within acceptable tolerances for direct substitution. Differences in output current capability (6mA vs. 20mA) and input offset voltage specification (7mV vs. 5mV) remain within the operational envelope for general-purpose comparator applications.

Parameter Comparison

Engineering Selection Recommendations

LM393PS (Primary Part - Last Time Buy Status): The LM393PS from Texas Instruments is currently designated Last Time Buy. Existing designs utilizing this part number should transition to equivalent alternatives to ensure long-term supply continuity and component availability.

LM393DR (Recommended Substitute): The LM393DR from Rohm Semiconductor is designated Not For New Designs but remains functionally equivalent to the LM393PS across all critical parameters. This part is suitable for sustaining production of existing designs and serves as a direct functional replacement. The LM393DR maintains identical supply voltage ranges, input bias current specifications, quiescent current limits, and operating temperature range. Minor variations in input offset voltage (7mV vs. 5mV) and output current capability (6mA vs. 20mA) do not preclude substitution in general-purpose comparator applications.

Compliance & Certification: Both parts maintain ROHS3 compliance, MSL Level 1 (Unlimited) moisture sensitivity rating, and REACH Unaffected status, ensuring regulatory equivalence for procurement and deployment.

Frequently Asked Questions (FAQ)

Q: Can the LM393DR directly replace the LM393PS in existing designs?

A: Yes. The LM393DR meets all functional and electrical requirements for direct substitution. Both devices feature identical dual comparator configuration, open-collector rail-to-rail output, supply voltage range (2V ~ 36V single, ±1V ~ ±18V dual), input bias current (0.25µA @ 5V), and quiescent current (2.5mA maximum). Minor parameter variations (input offset voltage and output current) remain within acceptable operational tolerances for general-purpose comparator applications.

Q: What is the significance of the package width difference between LM393PS and LM393DR?

A: The LM393PS is housed in an 8-SOIC package with 0.209" (5.30mm) width, while the LM393DR uses an 8-SOIC package with 0.154" (3.90mm) width. Both are surface mount 8-SOIC form factors. The width difference reflects manufacturing variations between Texas Instruments and Rohm Semiconductor. PCB footprint compatibility must be verified during design transition, as the narrower package may require layout adjustment.

Q: Why is the LM393PS designated Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments is discontinuing this part number. Existing inventory is available for final orders, but long-term availability cannot be guaranteed. Designs currently using the LM393PS should transition to the LM393DR or other functionally equivalent alternatives to maintain supply chain continuity.

Q: Are there compliance differences between the LM393PS and LM393DR?

A: No. Both parts maintain identical compliance certifications: ROHS3 Compliant, MSL Level 1 (Unlimited), and REACH Unaffected status. Regulatory and environmental requirements are equivalent across both devices.

Q: What is the practical impact of the output current difference (20mA vs. 6mA)?

A: The LM393PS provides 20mA typical output current, while the LM393DR provides 6mA typical output current. In general-purpose comparator applications with open-collector outputs, the output stage typically drives high-impedance logic inputs or external pull-up resistor networks. The 6mA capability of the LM393DR is sufficient for standard logic-level signaling. Applications requiring higher output current drive should evaluate load impedance and pull-up resistor values to confirm compatibility.

Q: What is the practical impact of the input offset voltage difference (5mV vs. 7mV)?

A: The LM393PS specifies 5mV maximum input offset voltage at 30V, while the LM393DR specifies 7mV maximum at 5V. Both values are within typical comparator specifications for general-purpose applications. The 2mV difference has negligible impact on threshold accuracy in standard signal detection and level-sensing circuits. Applications with tight threshold tolerance requirements should evaluate specific operating conditions against both datasheets.