LM193 MD8 Equivalent & Substitute Parts Reference

Part Overview

The LM193 MD8 is a low-power, low-offset voltage dual comparator manufactured by Texas Instruments in die form. This general-purpose comparator features open-collector, rail-to-rail output architecture and operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The device is classified as Active product status and is ROHS3 compliant.

Substitute parts are necessary when the die form packaging is unavailable, when alternative package types are required for specific PCB layouts, or when sourcing from alternative manufacturers is preferred for supply chain optimization. All substitute comparators listed maintain electrical equivalence within the specified parameter tolerances for general-purpose comparator applications.

Key Parameters

Parameter	Value	Specification Notes
Device Type	Dual Comparator, General Purpose	2 independent comparator elements per package
Output Configuration	Open-Collector, Rail-to-Rail	Allows direct logic interface and flexible pull-up configurations
Supply Voltage Range	2V ~ 36V (Single), ±1V ~ ±18V (Dual)	Wide operating range supports diverse power supply architectures
Input Offset Voltage (Max)	5mV @ 5V	Determines accuracy in precision comparison applications
Input Bias Current (Max)	1000pA @ 5V	Affects input impedance and signal source requirements
Output Current (Typical)	6mA	Sink current capability for load driving
Quiescent Current (Max)	2.5mA	Power consumption in standby or inactive state
CMRR / PSRR (Typical)	60dB CMRR, 60dB PSRR	Noise rejection performance
Propagation Delay (Max)	700ns (Typical)	Response time from input transition to output change
Operating Temperature	-55°C ~ 125°C	Industrial temperature range
Mounting Type	Surface Mount	Die form for hybrid and custom packaging applications
RoHS Status	ROHS3 Compliant	Lead-free, halogen-free construction

Substitute Part Grouping Explanation

Electrical substitution of the LM193 MD8 is determined by the following critical parameters that must remain constant or within acceptable tolerance:

Primary Substitution Criteria:

Dual comparator configuration (2 independent elements)
Open-collector, rail-to-rail output type
Supply voltage range: 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input offset voltage maximum: 5mV to 7mV @ 5V or 30V
Input bias current: 1000pA to 0.25µA @ 5V
Quiescent current: 2.5mA maximum
Operating temperature: minimum -40°C to -55°C, maximum 105°C to 150°C
ROHS3 compliance and EAR99 classification

Package Form Variations: Substitute parts are available in multiple surface-mount package types: 8-SOIC, 8-TSSOP, and 8-MSOP. These packages are electrically equivalent but differ in physical dimensions and PCB footprint requirements. The die form (LM193 MD8) is functionally equivalent to packaged versions of the LM2903 base product family.

Manufacturer Variants: Equivalent parts are sourced from Texas Instruments, STMicroelectronics, Rohm Semiconductor, and onsemi. All maintain the same electrical specifications and functional performance within the specified parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Package Type	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Grade
LM193 MD8	Texas Instruments	Die	5mV @ 5V	1000pA @ 5V	6mA	2.5mA	-55°C ~ 125°C	Commercial
LM2903D	STMicroelectronics	8-SOIC	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Commercial
LM2903DGKR	Rohm Semiconductor	8-MSOP	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Commercial
LM2903DMR2G	onsemi	8-MSOP	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	Commercial
LM2903HYDT	STMicroelectronics	8-SOIC	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 150°C	Automotive (AEC-Q100)
LM2903PT	STMicroelectronics	8-TSSOP	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Commercial
LM2903VDR2G	onsemi	8-SOIC	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Commercial
LM2903WDT	STMicroelectronics	8-SOIC	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	Commercial
LM2903WHYST	STMicroelectronics	8-MiniSO	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	Automotive (AEC-Q100)
LM2903WYDT	STMicroelectronics	8-SOIC	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	Automotive (AEC-Q100)
LM2903WYPT	STMicroelectronics	8-TSSOP	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Automotive (AEC-Q100)

Engineering Selection Recommendations

Commercial Grade Applications: For standard industrial and consumer applications operating within -40°C to 125°C, the LM2903D, LM2903DGKR, LM2903PT, and LM2903VDR2G provide direct electrical equivalence to the LM193 MD8. Selection among these variants depends on package availability and PCB layout requirements: 8-SOIC for standard footprints, 8-TSSOP for space-constrained designs, and 8-MSOP for compact applications.

Automotive and Extended Temperature Applications: The LM2903HYDT, LM2903WHYST, and LM2903WYDT are qualified to AEC-Q100 automotive standards and support extended operating temperatures up to 150°C. These variants are suitable for automotive, industrial control, and high-reliability applications requiring formal qualification documentation.

Output Current Considerations: The LM2903WDT and LM2903WHYST provide 20mA typical output current compared to 6mA for the LM193 MD8 and 16mA for most other LM2903 variants. Higher output current capability allows direct driving of higher-impedance loads without additional buffer stages.

Supply Chain and Inventory: All substitute parts maintain ROHS3 compliance and EAR99 classification. Selection should consider current inventory levels and lead times from preferred distributors. STMicroelectronics variants (LM2903D, LM2903PT, LM2903WDT, LM2903WYDT, LM2903WYPT) offer the highest inventory availability across multiple package types.

Frequently Asked Questions (FAQ)

Q: Can the LM193 MD8 die form be directly replaced with a packaged LM2903 variant?

A: Yes, electrically. The LM193 MD8 and all LM2903 packaged variants are functionally equivalent dual comparators with identical electrical specifications. However, the die form requires hybrid packaging or custom assembly, while packaged variants (8-SOIC, 8-TSSOP, 8-MSOP) mount directly to standard PCBs. Selection depends on your assembly process and PCB design requirements.

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

A: These are all surface-mount packages containing the same die but with different physical dimensions. 8-SOIC (0.154" width) is the standard package. 8-TSSOP (0.173" width) is slightly wider. 8-MSOP (0.118" width) is the most compact. All are electrically equivalent; selection depends on available PCB space and your assembly equipment capabilities.

Q: Are automotive-grade LM2903 variants (AEC-Q100) compatible with commercial applications?

A: Yes. Automotive-grade parts exceed commercial specifications and are fully compatible with commercial applications. The AEC-Q100 qualification indicates additional testing and reliability assurance. Use automotive variants when higher reliability or extended temperature operation (-40°C to 150°C) is required.

Q: What is the significance of input offset voltage specifications at different test conditions (5V vs. 30V)?

A: Input offset voltage is measured at specific supply voltages. The LM193 MD8 specifies 5mV maximum at 5V supply. Substitute parts specify 7mV at either 5V or 30V. Both values fall within acceptable tolerance for general-purpose comparator applications. The test condition reflects the manufacturer's characterization methodology and does not indicate functional incompatibility.

Q: Can I substitute an LM2903 variant with lower input bias current (0.25µA) for the LM193 MD8 (1000pA)?

A: Yes. Lower input bias current is a performance improvement, not a limitation. The 0.25µA specification in LM2903 variants is still within acceptable range for general-purpose comparator applications and reduces loading on high-impedance signal sources.

Q: What packaging format should I select for a new PCB design?

A: For new designs, select 8-SOIC (LM2903D, LM2903VDR2G, LM2903WDT, LM2903WYDT) for standard applications or 8-TSSOP (LM2903PT, LM2903WYPT) for space-constrained designs. Both offer excellent inventory availability and are supported by standard PCB assembly equipment. The 8-MSOP variant (LM2903DGKR) is suitable when minimum footprint is critical.

Q: Are there any functional differences between STMicroelectronics, Rohm Semiconductor, and onsemi LM2903 variants?

A: No functional differences exist within the specified parameter ranges. All manufacturers produce electrically equivalent devices meeting the same electrical specifications. Differences are limited to packaging options, inventory availability, and supply chain considerations. Selection can be based on preferred supplier relationships or current availability.

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