LM2903N Equivalent & Substitute Parts

Part Overview

The LM2903N is a dual general-purpose comparator IC manufactured by Texas Instruments in 8-DIP 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 LM2903N is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. Active alternatives maintain functional compatibility while offering improved availability, modern RoHS3 compliance, and expanded packaging options including surface-mount variants.

Key Parameters

Parameter	Value
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Propagation Delay (Max)	700ns
Operating Temperature	-40°C ~ 85°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the LM2903N is determined by strict electrical and mechanical compatibility across the following criteria:

Electrical Compatibility Requirements:

Dual comparator configuration (2 elements)
Open-collector or open-drain output capability with rail-to-rail performance
Supply voltage range: minimum 2V ~ 36V single or ±1V ~ 18V dual
Input offset voltage ≤ 7mV
Input bias current ≤ 0.25µA @ 5V
Output current ≥ 16mA @ 5V
Quiescent current ≤ 2.5mA
Operating temperature range encompassing -40°C to 85°C

Mechanical Compatibility Options:

Direct package match: 8-DIP through-hole (LM2903N/NOPB)
Alternative packages: 8-SOIC, 8-TSSOP, 8-MSOP, 8-SOP surface-mount variants

Substitutes are grouped by package type and product status. All listed alternatives meet or exceed the electrical specifications of the original LM2903N while maintaining functional equivalence in comparator applications.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Status
LM2903N	Texas Instruments	8-DIP	Through Hole	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Obsolete
LM2903N/NOPB	Texas Instruments	8-DIP	Through Hole	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active
LM2903YPT	STMicroelectronics	8-TSSOP	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM293D	STMicroelectronics	8-SOIC	Surface Mount	Open-Collector, Open-Drain, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 105°C	Active
LM293DMR2G	onsemi	8-MSOP	Surface Mount	Open-Collector, Open-Drain, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	Active
LM293PT	STMicroelectronics	8-TSSOP	Surface Mount	Open-Collector, Open-Drain, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 105°C	Active
LM393DR2G	onsemi	8-SOIC	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
LM393PT	STMicroelectronics	8-TSSOP	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	Active
LM2903DR	UMW	8-SOIC	Surface Mount	Open-Collector, Rail-to-Rail	2V~30V, ±1V~±15V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
AP393ASG-13	Diodes Incorporated	8-SOP	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	Active
LM393MX	onsemi	8-SOIC	Surface Mount	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	Obsolete

Engineering Selection Recommendations

Direct Package Replacement (Through-Hole): LM2903N/NOPB is the active equivalent of the obsolete LM2903N, maintaining identical 8-DIP through-hole packaging and electrical specifications. This part is recommended for direct board-level substitution without layout modification. RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1) provide modern manufacturing standards.

Surface-Mount Alternatives: For designs transitioning to surface-mount technology, LM2903YPT (STMicroelectronics, 8-TSSOP) and LM2903DR (UMW, 8-SOIC) maintain the LM2903 base product designation with full electrical compatibility. LM2903YPT extends the operating temperature range to -40°C ~ 125°C and includes AEC-Q100 automotive qualification, suitable for extended-temperature applications.

Extended Temperature Range: LM293D and LM293PT (STMicroelectronics) offer operating ranges to -40°C ~ 105°C, accommodating industrial and automotive environments. These parts feature open-drain output capability in addition to open-collector configuration, providing design flexibility.

High-Volume Availability: LM393DR2G (onsemi, 8-SOIC) and LM393PT (STMicroelectronics, 8-TSSOP) demonstrate the highest inventory levels (205,400 and 15,419 units respectively) among active substitutes. Both maintain full electrical compatibility with the original LM2903N specification.

Compliance Considerations: All recommended active substitutes carry RoHS3 compliance certification. The original LM2903N is RoHS non-compliant; substitution enables compliance with modern procurement and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can LM2903N/NOPB replace LM2903N directly on existing boards? A: Yes. LM2903N/NOPB is the active production equivalent with identical 8-DIP through-hole packaging, pinout, and electrical specifications. No board redesign is required.

Q: What is the primary difference between LM2903 and LM393 variants? A: Both are dual general-purpose comparators with equivalent electrical performance. The LM393 designation represents alternative manufacturer implementations (onsemi) while LM2903 variants are sourced from Texas Instruments, STMicroelectronics, and UMW. All meet the same functional requirements.

Q: Are surface-mount substitutes pin-compatible with the through-hole LM2903N? A: No. Surface-mount packages (8-SOIC, 8-TSSOP, 8-MSOP, 8-SOP) require PCB layout redesign. However, all maintain identical pinout order and electrical function, enabling straightforward schematic substitution with layout adaptation.

Q: Which substitute offers the widest operating temperature range? A: LM2903YPT (STMicroelectronics, 8-TSSOP) operates from -40°C to 125°C, extending 40°C above the original LM2903N specification. This part includes AEC-Q100 automotive qualification.

Q: Does package selection affect electrical performance? A: No. All listed substitutes maintain equivalent electrical specifications regardless of package type. Package selection is determined by PCB assembly technology (through-hole vs. surface-mount) and thermal management requirements.

Q: Are all substitutes RoHS3 compliant? A: All active substitutes listed carry RoHS3 compliance. The original LM2903N is RoHS non-compliant. Substitution enables compliance with modern environmental and procurement standards.

Q: What is the significance of MSL (Moisture Sensitivity Level) rating? A: All substitutes carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. This simplifies supply chain management compared to higher MSL ratings requiring controlled humidity storage.

Q: Can LM2903DR (UMW) be used in place of LM2903N? A: LM2903DR is functionally compatible but operates at reduced maximum supply voltage (2V ~ 30V vs. 2V ~ 36V) and dual supply range (±1V ~ ±15V vs. ±1V ~ 18V). Verify application voltage requirements before substitution.

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