LM2903DRCT Equivalent & Substitute Parts

Part Overview

The LM2903DRCT is a general-purpose dual comparator manufactured by Texas Instruments, featuring open-collector, rail-to-rail output configuration in an 8-SOIC surface-mount package. This device operates across a wide supply voltage range of 2V to 30V (single supply) or ±1V to ±15V (dual supply), with an operating temperature range of -40°C to 125°C. The LM2903DRCT maintains active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements necessitate alternative package configurations, enhanced temperature ratings, or improved electrical performance specifications. Substitute parts must maintain functional compatibility through matching or exceeding critical electrical parameters while adhering to the same or compatible package footprints.

Key Parameters

Parameter	Value	Unit	Condition
Number of Elements	2	—	Dual comparator configuration
Output Type	Open-Collector, Rail-to-Rail	—	Standard output configuration
Voltage - Supply, Single/Dual (±)	2V ~ 30V, ±1V ~ 15V	V	Operating range
Voltage - Input Offset (Max)	7	mV	@ 30V
Current - Input Bias (Max)	0.25	µA	@ 5V
Current - Output (Typ)	6	mA	@ 5V
Current - Quiescent (Max)	1	mA	—
Propagation Delay (Max)	1	µs	Typical
Operating Temperature	-40 to 125	°C	Industrial grade
Package / Case	8-SOIC (0.154", 3.90mm Width)	—	Surface mount
RoHS Status	ROHS3 Compliant	—	Environmental compliance
Moisture Sensitivity Level (MSL)	1	—	Unlimited shelf life

Substitute Part Grouping Explanation

Substitute parts for the LM2903DRCT are classified based on strict adherence to the following critical parameters:

Primary Substitution Criteria:

Dual comparator configuration (2 elements)
Open-collector or open-collector/open-drain output type with rail-to-rail capability
Supply voltage range compatibility: minimum 2V single supply or ±1V dual supply
Input offset voltage ≤ 7mV
Input bias current ≤ 0.25µA
Output current capability ≥ 6mA
Quiescent current ≤ 2.5mA
Operating temperature range: -40°C minimum and 125°C minimum
Surface-mount package configuration
RoHS3 compliance and MSL 1 rating

Package Compatibility Groups:

Group A (8-SOIC): Direct footprint compatibility with LM2903DRCT
Group B (8-TSSOP/8-MSOP): Alternative compact packages requiring PCB layout modification
Group C (Automotive Grade): Enhanced temperature range (-40°C to 150°C) with AEC-Q100 qualification

Substitutes are organized by package type and performance tier, with electrical parameters verified against the main part specifications.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage (V)	Input Offset (mV)	Input Bias (µA)	Output Current (mA)	Quiescent (mA)	Temp Range (°C)	Grade
LM2903DRCT	Texas Instruments	8-SOIC	2-30, ±1-15	7 @ 30V	0.25 @ 5V	6 @ 5V	1	-40 to 125	Industrial
LM2903DGKR	Rohm Semiconductor	8-MSOP	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	Industrial
LM2903EDR2G	onsemi	8-SOIC	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 105	Industrial
LM2903HYDT	STMicroelectronics	8-SOIC	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 150	Automotive
LM2903HYPT	STMicroelectronics	8-TSSOP	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 150	Automotive
LM2903PT	STMicroelectronics	8-TSSOP	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	Industrial
LM2903WDT	STMicroelectronics	8-SOIC	2-36, ±1-18	7 @ 30V	0.25 @ 5V	20	2.5	-40 to 125	Industrial
LM2903YDT	STMicroelectronics	8-SOIC	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	Automotive
LM293ADT	STMicroelectronics	8-SOIC	2-36, ±1-18	2 @ 30V	0.1 @ 5V	18 @ 5V	2.5	-40 to 105	Industrial
LM293ST	STMicroelectronics	8-MiniSO	2-36, ±1-18	5 @ 30V	0.25 @ 5V	18 @ 5V	2.5	-40 to 105	Industrial
LM393ADT	STMicroelectronics	8-SOIC	2-36, ±1-18	2 @ 30V	0.1 @ 5V	18 @ 5V	2.5	0 to 70	Industrial

Engineering Selection Recommendations

Direct Footprint Replacement (8-SOIC Package):

The following parts provide direct pin-compatible substitution without PCB layout modification:

LM2903EDR2G (onsemi): Maintains 8-SOIC footprint with extended supply voltage range (2V-36V) and identical quiescent current specification. Operating temperature limited to -40°C to 105°C. Suitable for applications not requiring the full 125°C upper temperature limit.
LM2903HYDT (STMicroelectronics): 8-SOIC package with automotive-grade qualification (AEC-Q100) and extended operating temperature to 150°C. Enhanced supply voltage range and increased output current capability (16mA). Recommended for automotive and high-temperature applications.
LM2903WDT (STMicroelectronics): 8-SOIC configuration with highest output current specification (20mA typical). Maintains -40°C to 125°C temperature range. Suitable for applications requiring maximum output drive capability.
LM2903YDT (STMicroelectronics): 8-SOIC package with automotive-grade qualification and -40°C to 125°C operating range. Provides enhanced performance specifications with increased output current (16mA).

Enhanced Performance Alternatives (8-SOIC):

LM293ADT (STMicroelectronics): Superior input offset voltage (2mV vs. 7mV) and reduced input bias current (0.1µA vs. 0.25µA). 8-SOIC footprint with -40°C to 105°C range. Recommended for precision applications requiring lower input offset specifications.
LM393ADT (STMicroelectronics): Lowest input offset voltage (2mV) and input bias current (0.1µA) among all substitutes. 8-SOIC package. Operating temperature range 0°C to 70°C limits use to commercial-grade applications only.

Compact Package Alternatives (8-TSSOP/8-MSOP):

LM2903HYPT (STMicroelectronics): 8-TSSOP package with automotive qualification and -40°C to 150°C operating range. Requires PCB layout modification but provides space savings and extended temperature capability.
LM2903PT (STMicroelectronics): 8-TSSOP package with industrial-grade specifications and -40°C to 125°C range. Compact footprint alternative for space-constrained designs.
LM2903DGKR (Rohm Semiconductor): 8-MSOP package with extended supply voltage range (2V-36V, ±1V-18V) and increased output current (16mA). Requires PCB layout modification.
LM293ST (STMicroelectronics): 8-MiniSO package with reduced input offset voltage (5mV) and increased output current (18mA). Compact form factor for space-critical applications.

Selection Criteria by Application:

Standard Industrial Applications: LM2903DRCT (primary) or LM2903WDT (higher output current)
Automotive/High-Temperature: LM2903HYDT or LM2903HYPT (AEC-Q100 qualified, -40°C to 150°C)
Precision Applications: LM293ADT or LM393ADT (2mV input offset, 0.1µA bias current)
Space-Constrained Designs: LM2903HYPT, LM2903PT, or LM293ST (compact packages)
Extended Supply Voltage: LM2903DGKR or LM2903EDR2G (2V-36V range)

All substitute parts maintain RoHS3 compliance and MSL 1 rating. Product status is active for all listed alternatives, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q1: Can LM2903DRCT be directly replaced with LM2903HYDT?

A: Yes. Both devices feature 8-SOIC footprint, dual open-collector comparators, and compatible electrical specifications. LM2903HYDT provides extended operating temperature range (-40°C to 150°C) and automotive-grade qualification (AEC-Q100). Direct pin-compatible substitution is possible without PCB modification.

Q2: What is the difference between LM2903 and LM293 series parts?

A: LM2903 and LM293 are distinct product lines with different base specifications. LM293ADT and LM293ST offer superior input offset voltage (2mV vs. 7mV) and reduced input bias current (0.1µA vs. 0.25µA). However, LM293 series parts have lower maximum operating temperature (105°C vs. 125°C). Selection depends on whether precision input characteristics or extended temperature range is prioritized.

Q3: Are 8-TSSOP and 8-MSOP packages interchangeable with 8-SOIC?

A: No. While all three are 8-pin surface-mount packages, they have different physical dimensions and pin layouts. LM2903HYPT (8-TSSOP) and LM2903DGKR (8-MSOP) require PCB layout modification and cannot be used as drop-in replacements for 8-SOIC designs. Footprint verification is mandatory before substitution.

Q4: Which substitute part offers the highest output current capability?

A: LM2903WDT provides the highest typical output current specification at 20mA (@ 5V), compared to 6mA for the LM2903DRCT. This makes LM2903WDT suitable for applications requiring maximum output drive capability while maintaining 8-SOIC footprint compatibility.

Q5: What is the significance of AEC-Q100 qualification?

A: AEC-Q100 qualification indicates automotive-grade reliability testing and is required for automotive applications. LM2903HYDT, LM2903HYPT, and LM2903YDT carry this qualification. Non-automotive applications do not require this certification, but automotive designs must use AEC-Q100 qualified parts.

Q6: Can LM393ADT replace LM2903DRCT in all applications?

A: No. LM393ADT has a restricted operating temperature range (0°C to 70°C) compared to LM2903DRCT (-40°C to 125°C). LM393ADT is suitable only for commercial-grade applications within this narrower temperature window. Industrial and automotive applications requiring -40°C operation must use alternative substitutes.

Q7: What are the key electrical differences between LM2903DRCT and LM293ADT?

A: LM293ADT offers superior precision specifications: input offset voltage of 2mV (vs. 7mV) and input bias current of 0.1µA (vs. 0.25µA). Both maintain 8-SOIC footprint and open-collector output. LM293ADT is limited to -40°C to 105°C operating range, while LM2903DRCT extends to 125°C. Selection depends on whether precision input characteristics or extended temperature range is required.

Q8: Is supply voltage range expansion important for substitution?

A: Supply voltage range expansion (2V-36V vs. 2V-30V) provides design flexibility for applications with varying power supply specifications. Substitute parts with extended range (LM2903EDR2G, LM2903HYDT, LM2903HYPT, LM2903PT, LM2903WDT, LM2903YDT, LM293ADT, LM293ST, LM393ADT) accommodate broader system requirements without functional compromise.

Q9: What packaging considerations apply when selecting compact alternatives?

A: Compact packages (8-TSSOP, 8-MSOP, 8-MiniSO) require PCB layout redesign, including trace routing, via placement, and thermal management modifications. Footprint verification against design files is mandatory. Compact packages offer space savings but introduce layout complexity and potential signal integrity considerations in high-speed applications.

Q10: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL 1 (unlimited moisture sensitivity level) rating, matching the environmental and reliability specifications of the LM2903DRCT. This ensures regulatory compliance and consistent handling requirements across all alternatives.

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