LM193AH/NOPB Equivalent & Substitute Parts

Part Overview

The LM193AH/NOPB is a dual general-purpose comparator manufactured by Texas Instruments in TO-99-8 metal can through-hole packaging. This device features open-collector, rail-to-rail output configuration with supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual), making it suitable for precision voltage comparison applications across industrial and consumer electronics. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when through-hole TO-99-8 packaging is unavailable, when surface-mount alternatives are preferred for modern PCB designs, or when specific performance grades (automotive-qualified variants) are required for application-specific requirements.

Substiute Parts

LM193AH/NOPB

Texas InstrumentsIn Stock: 1158LM193AH/NOPB Datasheet

Current PartRFQ

LM193AH

Texas InstrumentsIn Stock: 1748LM193AH Datasheet

Parametric EquivalentRFQ

LM193DT

STMicroelectronicsIn Stock: 78096LM193DT Datasheet

MFR RecommendedRFQ

LM2903DT

STMicroelectronicsIn Stock: 85492LM2903DT Datasheet

MFR RecommendedRFQ

LM2903Q2T

STMicroelectronicsIn Stock: 174997LM2903Q2T Datasheet

MFR RecommendedRFQ

LM2903WYDT

STMicroelectronicsIn Stock: 27484LM2903WYDT Datasheet

MFR RecommendedRFQ

LM293PT

STMicroelectronicsIn Stock: 2696LM293PT Datasheet

MFR RecommendedRFQ

LM393DR2G

onsemiIn Stock: 205494LM393DR2G Datasheet

MFR RecommendedRFQ

LM393DT

STMicroelectronicsIn Stock: 505116LM393DT Datasheet

MFR RecommendedRFQ

LM393PT

STMicroelectronicsIn Stock: 15475LM393PT Datasheet

MFR RecommendedRFQ

LM393QT

STMicroelectronicsIn Stock: 2030LM393QT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Dual comparator configuration (2 elements per package)
• Open-collector, rail-to-rail output topology
• Supply voltage compatibility (2V ~ 36V single / ±1V ~ 18V dual)
• Quiescent current specification (2.5mA maximum)
• General-purpose comparator classification
• ROHS3 compliance and MSL 1 rating

Substitute parts are grouped into three categories based on packaging and performance characteristics:

1. Parametric Equivalent (Same Package): LM193AH maintains identical TO-99-8 through-hole packaging with matching electrical specifications.

2. Surface-Mount Alternatives (Standard Grade): LM193DT, LM2903DT, LM2903Q2T, LM393DR2G, LM393DT, and LM393PT offer surface-mount packages (8-SOIC, 8-DFN, 8-TSSOP) with equivalent electrical performance for commercial temperature range (0°C ~ 70°C) or extended range (-40°C ~ 125°C).

3. Automotive-Qualified Variant: LM2903WYDT provides AEC-Q100 qualification with automotive-grade performance in 8-SOIC packaging.

4. Compact Surface-Mount Option: LM393QT offers 8-UFSON (2x2) ultra-compact packaging for space-constrained applications.

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole Applications: LM193AH (Texas Instruments) provides direct parametric equivalence to LM193AH/NOPB with identical TO-99-8 packaging and extended temperature range (-55°C ~ 125°C). Both parts maintain ROHS3 compliance and MSL 1 rating.

For Surface-Mount Conversion with Extended Temperature: LM193DT (STMicroelectronics) in 8-SOIC packaging maintains -55°C ~ 125°C operating range with input offset voltage of 5mV and output current of 18mA, suitable for industrial applications requiring temperature extremes.

For Compact Surface-Mount Designs: LM2903Q2T (STMicroelectronics) in 8-DFN (2x2) packaging provides the smallest footprint with -40°C ~ 125°C temperature range and equivalent electrical performance.

For Automotive Applications: LM2903WYDT (STMicroelectronics) carries AEC-Q100 qualification with -40°C ~ 125°C operating range and 20mA typical output current in 8-SOIC packaging.

For Standard Commercial Temperature Range: LM393DT or LM393DR2G in 8-SOIC packaging offer 0°C ~ 70°C operation with high inventory availability (505,100 and 205,400 units respectively) and equivalent electrical specifications.

For TSSOP Packaging: LM393PT or LM293PT provide 8-TSSOP surface-mount option with 0°C ~ 70°C or -40°C ~ 105°C temperature ranges respectively.

All substitute parts maintain dual comparator configuration, open-collector rail-to-rail output topology, 2V ~ 36V supply voltage compatibility, 2.5mA maximum quiescent current, and ROHS3 compliance with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can LM193AH/NOPB be directly replaced with surface-mount alternatives in existing through-hole designs?

A: No. Through-hole and surface-mount packages require different PCB layouts and soldering processes. LM193AH (through-hole TO-99-8) is the direct equivalent. Surface-mount alternatives (LM193DT, LM2903DT, LM393DT) require PCB redesign.

Q: What is the primary difference between LM193DT and LM2903DT?

A: Both are 8-SOIC surface-mount dual comparators with equivalent supply voltage and output topology. LM193DT maintains -55°C ~ 125°C temperature range with 2mV input offset specification. LM2903DT operates -40°C ~ 125°C with 7mV input offset. Selection depends on temperature requirements and offset voltage tolerance.

Q: Is LM2903WYDT suitable for automotive applications?

A: Yes. LM2903WYDT carries AEC-Q100 automotive qualification with -40°C ~ 125°C operating range and 20mA typical output current in 8-SOIC packaging, meeting automotive-grade reliability standards.

Q: What packaging options are available for surface-mount substitution?

A: Four surface-mount package options exist: 8-SOIC (LM193DT, LM2903DT, LM2903WYDT, LM393DT, LM393DR2G), 8-DFN (2x2) (LM2903Q2T), 8-TSSOP (LM293PT, LM393PT), and 8-UFSON (2x2) (LM393QT).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original LM193AH/NOPB specifications.

Q: Which substitute offers the highest output current capability?

A: LM2903WYDT provides 20mA typical output current, exceeding the original LM193AH/NOPB specification of 16mA at 5V.

Q: Can LM393QT be used as a direct substitute?

A: LM393QT in 8-UFSON (2x2) packaging provides the most compact surface-mount option with 2.5mA quiescent current specification. However, input offset voltage, input bias current, and output current specifications are not provided in available documentation, requiring verification against application requirements.

Q: What is the inventory status of substitute parts?

A: LM393DT (505,100 units), LM2903Q2T (174,900 units), and LM393DR2G (205,400 units) maintain the highest inventory levels. LM193AH (1,654 units) and LM2903WYDT (27,390 units) offer moderate availability. LM393QT (2,000 units) has limited stock.