LM193 MDR Equivalent & Substitute Parts Reference

Part Overview

The LM193 MDR 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 manufacturers are required for supply chain continuity, or when specific package formats (8-SOIC, 8-TSSOP, 8-MSOP) are preferred for board-level integration. The LM193 MDR base functionality is preserved across all listed substitute parts through the LM2903 and LM393 product families.

Key Parameters

Parameter	LM193 MDR (Main Part)	Specification
Manufacturer	Texas Instruments	Primary source
Category	Linear Comparator	General Purpose
Number of Elements	2	Dual comparator
Output Type	Open-Collector, Rail-to-Rail	Standard output configuration
Voltage Supply Range (Single/Dual)	2V ~ 36V / ±1V ~ 18V	Wide operating range
Input Offset Voltage (Max)	5mV @ 5V	Low offset specification
Input Bias Current (Max)	1000pA @ 5V	Low bias current
Output Current (Typ)	6mA	Typical output drive
Quiescent Current (Max)	2.5mA	Low power consumption
CMRR / PSRR (Typ)	60dB / 60dB	Common-mode and power-supply rejection
Propagation Delay (Max)	700ns (Typ)	Response time
Operating Temperature	-55°C ~ 125°C	Extended industrial range
Package / Case	Die	Bare die form
Mounting Type	Surface Mount	Die attachment
RoHS Status	ROHS3 Compliant	Environmental compliance
Product Status	Active	Currently manufactured

Substitute Part Grouping Explanation

Substitution of the LM193 MDR is determined by the following critical parameters:

Functional Equivalence Criteria:

Dual comparator architecture (2 elements)
Open-Collector, Rail-to-Rail output type
Supply voltage range compatibility: minimum 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input offset voltage specification: 5mV or lower
Quiescent current: 2.5mA maximum
ROHS3 compliance

Package Substitution Logic: The LM193 MDR die form is substituted by packaged equivalents in the LM2903 and LM393 families. These families maintain identical electrical specifications while offering standard surface-mount packages (8-SOIC, 8-TSSOP, 8-MSOP, 8-UFSON) suitable for PCB assembly.

Manufacturer Variants: Substitute parts are sourced from onsemi, STMicroelectronics, and UMW. All maintain the same base product specifications and ROHS3 compliance. Automotive-grade variants (LM2903HYDT, LM2903YPT) include AEC-Q100 qualification for extended temperature ranges.

Temperature Range Considerations:

Standard commercial grade: 0°C ~ 70°C
Industrial grade: -40°C ~ 105°C or -40°C ~ 125°C
Automotive grade: -40°C ~ 150°C

The LM193 MDR operates -55°C ~ 125°C, which exceeds most standard substitutes. Selection must account for application temperature requirements.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage (Single/Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	RoHS
LM193 MDR	Texas Instruments	Die	2V~36V / ±1V~18V	5mV @ 5V	1000pA @ 5V	6mA	2.5mA	-55°C ~ 125°C	ROHS3
LM2903DR	UMW	8-SOP	2V~30V / ±1V~±15V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3
LM2903DR2G	onsemi	8-SOIC	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	ROHS3
LM2903HYDT	STMicroelectronics	8-SOIC	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 150°C	ROHS3
LM2903YPT	STMicroelectronics	8-TSSOP	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM293DMR2G	onsemi	8-MSOP	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	ROHS3
LM293PT	STMicroelectronics	8-TSSOP	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 105°C	ROHS3
LM293QT	STMicroelectronics	8-UFSON (2x2)	2V~36V / ±1V~18V	Not specified	Not specified	Not specified	2.5mA	Not specified	ROHS3
LM393ADT	STMicroelectronics	8-SOIC	2V~36V / ±1V~18V	2mV @ 30V	0.1µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3
LM393DR2G	onsemi	8-SOIC	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3
LM393DT	STMicroelectronics	8-SOIC	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM2903DR2G (onsemi) and LM2903HYDT (STMicroelectronics) are the closest functional equivalents to LM193 MDR. Both maintain the full supply voltage range (2V~36V / ±1V~18V), identical quiescent current specification (2.5mA), and ROHS3 compliance. LM2903HYDT extends the operating temperature to -40°C ~ 150°C with AEC-Q100 automotive qualification, suitable for extended-range applications. LM2903DR2G operates -40°C ~ 105°C, adequate for industrial applications.

Package-Specific Selections:

For 8-SOIC package requirement: LM2903DR2G, LM393ADT, LM393DR2G, or LM393DT provide standard surface-mount compatibility.

For 8-TSSOP package requirement: LM2903YPT or LM293PT offer compact form factor with automotive-grade temperature ratings.

For 8-MSOP package requirement: LM293DMR2G provides the smallest footprint, though operating temperature is limited to -25°C ~ 85°C.

For 8-UFSON (2x2) package requirement: LM293QT offers the most compact solution; however, several electrical parameters are not specified in available documentation.

Temperature Range Considerations:

The LM193 MDR operates -55°C ~ 125°C. No substitute part matches this full range. For applications requiring -55°C operation, the LM193 MDR die form remains the only specified option. For applications limited to -40°C minimum, LM2903HYDT, LM2903YPT, LM293PT, and LM393ADT are suitable.

Supply Voltage Compatibility:

LM2903DR (UMW) operates 2V~30V single supply, which is narrower than LM193 MDR (2V~36V). This part is not recommended for applications requiring operation above 30V.

All other substitutes maintain the full 2V~36V / ±1V~18V range.

Compliance and Certification:

All listed substitutes are ROHS3 compliant and carry REACH Unaffected status. Automotive-grade variants (LM2903HYDT, LM2903YPT) include AEC-Q100 qualification for automotive applications.

Frequently Asked Questions (FAQ)

Q1: Can LM2903DR2G directly replace LM193 MDR in all applications?

LM2903DR2G is functionally equivalent for electrical operation within the overlapping specifications. However, the package changes from die form to 8-SOIC, requiring PCB layout modification. The operating temperature range differs: LM2903DR2G operates -40°C ~ 105°C versus LM193 MDR at -55°C ~ 125°C. Applications requiring operation below -40°C must retain the LM193 MDR.

Q2: What is the difference between LM2903 and LM393 product families?

Both are dual general-purpose comparators with open-collector, rail-to-rail outputs. The LM393 family features lower input offset voltage (2mV typical for LM393ADT versus 5mV~7mV for LM2903 variants) and lower input bias current (0.1µA for LM393ADT versus 0.25µA for LM2903). For precision applications requiring minimal offset, LM393 variants are preferred. For general-purpose applications, both families are interchangeable.

Q3: Are automotive-grade parts (LM2903HYDT, LM2903YPT) necessary for non-automotive applications?

Automotive-grade parts include AEC-Q100 qualification and extended temperature ranges (-40°C ~ 150°C for LM2903HYDT). For non-automotive applications operating within 0°C ~ 70°C or -40°C ~ 105°C, standard-grade equivalents (LM2903DR2G, LM393DT) are sufficient and may offer cost advantages.

Q4: Which package is recommended for new PCB designs?

8-SOIC (0.154", 3.90mm width) is the industry-standard package for dual comparators, offering optimal balance between board space and handling ease. 8-TSSOP (0.173", 4.40mm width) provides a more compact footprint for space-constrained designs. 8-MSOP (0.118", 3.00mm width) offers the smallest footprint but with limited temperature range (-25°C ~ 85°C for LM293DMR2G). 8-UFSON (2x2) is the most compact but with incomplete electrical specifications in available data.

Q5: What is the impact of input bias current differences on circuit design?

LM193 MDR specifies 1000pA (1nA) input bias current, while most substitutes specify 0.25µA (250nA). This 250× difference affects high-impedance input circuits. For applications with source impedances exceeding 1MΩ, the higher bias current of substitutes may introduce measurable offset errors. Precision applications should account for this specification change through input impedance matching or bias current compensation.

Q6: Can LM293 variants substitute for LM2903 or LM393?

LM293 variants (LM293DMR2G, LM293PT, LM293QT) are functionally equivalent but with different output current specifications and temperature ranges. LM293DMR2G operates -25°C ~ 85°C, which is narrower than LM2903 or LM393 variants. LM293PT operates -40°C ~ 105°C with 18mA typical output current. For applications requiring extended temperature range or specific output current requirements, verify compatibility before substitution.

Q7: Is the 700ns propagation delay of LM193 MDR critical for substitution?

The LM193 MDR specifies 700ns typical propagation delay. Most substitutes do not specify this parameter in available documentation. For timing-critical applications (comparator-based oscillators, precision timing circuits), the lack of specified propagation delay in substitutes may require experimental verification or selection of parts with published specifications (LM2903DR specifies 300ns typical).

Q8: What inventory considerations apply to these substitutes?

Current inventory levels vary significantly: LM393DT (505,100 pcs), LM393DR2G (205,400 pcs), and LM2903YPT (141,400 pcs) have high availability. LM293QT (2,100 pcs) and LM293PT (2,669 pcs) have limited stock. For supply chain continuity, parts with higher inventory levels are preferred.

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