LM293H/NOPB Equivalent & Substitute Parts

Part Overview

The LM293H/NOPB is a general-purpose dual 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 a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The part is active and ROHS3 compliant, with 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 extended operating temperature ranges or automotive-grade qualifications are required.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM293H/NOPB
Manufacturer	Texas Instruments
Category	Linear Comparator
Type	General Purpose
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage Supply (Single/Dual)	2V ~ 36V / ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Propagation Delay (Max)	700ns
Operating Temperature	-25°C ~ 85°C
Package / Case	TO-99-8 Metal Can
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Electrical Compatibility Requirements:

Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
Output type: Open-Collector, Rail-to-Rail configuration
Number of elements: 2 comparators per package
Input offset voltage: Maximum 5mV to 8mV @ specified voltage
Input bias current: Maximum 0.25µA to 0.4µA @ 5V
Output current: Minimum 16mA typical @ 5V
Quiescent current: Maximum 2.5mA

Mechanical & Environmental Compatibility:

Package options: Surface-mount alternatives (8-MSOP, 8-SOIC, 8-TSSOP, 8-UFSON, 8-MiniSO) acceptable for redesigns
RoHS3 compliance required
MSL rating: 1 or 3 acceptable for standard applications
Operating temperature: Extended ranges (-40°C to 125°C or higher) acceptable for enhanced reliability

All substitute parts listed maintain electrical parameter equivalence within specified tolerances and support the same functional application as the original LM293H/NOPB.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	RoHS
LM293H/NOPB	Texas Instruments	TO-99-8	Through Hole	Open-Collector, Rail-to-Rail	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	ROHS3
AP393AM8G-13	Diodes Incorporated	8-MSOP	Surface Mount	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~36V / ±1V~18V	8mV @ 5V	0.4µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3
AP393SG-13	Diodes Incorporated	8-SOP	Surface Mount	Open-Collector	2V~36V / ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA	2.5mA	0°C ~ 70°C	ROHS3
LM193QT	STMicroelectronics	8-UFSON (2x2)	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V / ±1V~18V	Not specified	Not specified	Not specified	2.5mA	Not specified	ROHS3
LM2903DGKR	Rohm Semiconductor	8-MSOP/VSSOP	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM2903DMR2G	onsemi	8-MSOP	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	ROHS3
LM2903EDR2G	onsemi	8-SOIC	Surface Mount	Not specified	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 105°C	ROHS3
LM2903HYPT	STMicroelectronics	8-TSSOP	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 150°C	ROHS3
LM2903WDT	STMicroelectronics	8-SOIC	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	ROHS3
LM2903WHYST	STMicroelectronics	8-MiniSO	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	ROHS3
LM2903WYDT	STMicroelectronics	8-SOIC	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	ROHS3

Engineering Selection Recommendations

For Direct Through-Hole Replacement: No direct through-hole substitute is available. The LM293H/NOPB is the only part in this list with TO-99-8 metal can through-hole packaging. PCB redesign to surface-mount technology is required for substitution.

For Surface-Mount Redesign (Standard Temperature Range): AP393SG-13 (Diodes Incorporated, 8-SOP) provides the closest electrical match with identical input offset voltage (5mV @ 5V) and input bias current (0.25µA @ 5V). Operating temperature range is 0°C to 70°C, suitable for commercial applications.

For Extended Temperature Range (-40°C to 105°C or Higher): LM2903DMR2G (onsemi, 8-MSOP) or LM2903DGKR (Rohm Semiconductor, 8-MSOP/VSSOP) support -40°C to 105°C operation. LM2903HYPT (STMicroelectronics, 8-TSSOP) extends to -40°C to 150°C with AEC-Q100 automotive qualification.

For Automotive Applications (AEC-Q100 Qualified): LM2903HYPT and LM2903WYDT both carry AEC-Q100 qualification and automotive-grade designation. Both support -40°C to 125°C operating range with open-collector, rail-to-rail output configuration.

For High Output Current Applications: LM2903WDT, LM2903WHYST, and LM2903WYDT deliver 20mA typical output current compared to 16mA in the original part, providing additional drive capability while maintaining electrical compatibility.

All substitute parts are ROHS3 compliant and active products with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I use a surface-mount part as a direct replacement for the LM293H/NOPB?

A: No. The LM293H/NOPB uses through-hole TO-99-8 metal can packaging. Surface-mount substitutes require PCB redesign. However, all listed surface-mount alternatives maintain electrical compatibility with the original part's functional specifications.

Q: What is the key difference between AP393SG-13 and LM2903DMR2G?

A: AP393SG-13 operates from 0°C to 70°C (commercial range), while LM2903DMR2G operates from -40°C to 105°C (industrial range). Both maintain identical supply voltage, input offset, and input bias specifications. Choose based on required operating temperature.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original LM293H/NOPB.

Q: Which substitute offers the widest operating temperature range?

A: LM2903HYPT (STMicroelectronics, 8-TSSOP) supports -40°C to 150°C operation with AEC-Q100 automotive qualification, providing the broadest temperature coverage.

Q: What is the difference between 8-MSOP, 8-SOIC, and 8-TSSOP packages?

A: These are all 8-pin surface-mount packages with different physical dimensions. 8-MSOP (0.118" width) is the smallest, 8-SOIC (0.154" width) is standard, and 8-TSSOP (0.173" width) is slightly larger. All are electrically equivalent; package selection depends on PCB layout constraints and assembly capabilities.

Q: Can I substitute LM2903WYDT for LM293H/NOPB in a high-reliability application?

A: Yes, with PCB redesign. LM2903WYDT carries AEC-Q100 automotive qualification, operates from -40°C to 125°C, and delivers 20mA output current. It is suitable for high-reliability applications requiring automotive-grade components.

Q: What does MSL 1 (Unlimited) mean compared to MSL 3 (168 Hours)?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. MSL 3 requires moisture baking if the component is exposed to humidity for more than 168 hours before soldering. For standard manufacturing environments, both ratings are acceptable.

Q: Are there any electrical performance differences I should consider?

A: Input offset voltage ranges from 5mV to 8mV across substitutes, all within acceptable tolerance. Output current varies from 16mA to 20mA, with higher values providing additional drive capability. Quiescent current is consistently 2.5mA or lower. All differences are within normal design margins for general-purpose comparator applications.

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