LM193FKB Equivalent & Substitute Parts

Part Overview

The LM193FKB is a dual differential comparator manufactured by Texas Instruments, designed for general-purpose comparison applications. This device features open-collector, rail-to-rail output configuration in a 20-LCCC surface-mount package. The part is currently in active production status with 809 units in stock.

Substitute parts are identified when they maintain functional equivalence across critical electrical parameters including supply voltage range, input offset voltage, input bias current, output current capability, and quiescent current consumption. Package form factor differences are acceptable when the substitute part meets or exceeds the electrical specifications of the LM193FKB.

Key Parameters

Parameter	LM193FKB Value	Unit
Number of Elements	2	—
Output Type	Open-Collector, Rail-to-Rail	—
Voltage - Supply, Single/Dual (±)	2V ~ 30V, ±1V ~ 15V	V
Voltage - Input Offset (Max)	5mV @ 30V	mV
Current - Input Bias (Max)	0.1µA @ 5V	µA
Current - Output (Typ)	6mA @ 5V	mA
Current - Quiescent (Max)	1mA	mA
Propagation Delay (Max)	1.3µs (Typ)	µs
Operating Temperature	-55°C ~ 125°C	°C
Package / Case	20-CLCC	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the LM193FKB is determined by the following critical parameters:

Electrical Compatibility Criteria:

Dual-element comparator configuration (2 independent comparators per package)
Open-collector or open-collector/rail-to-rail output type
Supply voltage range must encompass or exceed 2V ~ 30V single supply or ±1V ~ 15V dual supply
Input offset voltage ≤ 8mV @ 5V or 30V test condition
Input bias current ≤ 0.4µA @ 5V
Output current capability ≥ 6mA @ 5V
Quiescent current ≤ 2.5mA
Operating temperature range must include -55°C minimum or extend to -40°C minimum with 125°C maximum

Functional Equivalence: All identified substitute parts maintain the core dual-comparator architecture with open-collector output topology. Substitutes operate across extended or equivalent supply voltage ranges and preserve input/output electrical characteristics within specified tolerances. Package form factors differ (8-pin SOIC, 8-pin MSOP, 8-pin TSSOP variants) but do not affect functional performance in applications where pinout compatibility is maintained.

Parameter Comparison

Parameter	LM193FKB	AP393AM8G-13	LM193DT	LM2903D	LM2903DGKR	LM2903DMR2G	LM2903VDR2G	LM2903WDT	LM2903WYPT	LM2903YDT	LM293ST
Manufacturer	Texas Instruments	Diodes Inc.	STMicroelectronics	STMicroelectronics	Rohm Semiconductor	onsemi	onsemi	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Number of Elements	2	2	2	2	2	2	2	2	2	2	2
Output Type	Open-Collector, Rail-to-Rail	CMOS, DTL, ECL, MOS, Open-Collector, TTL	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Open-Drain, Rail-to-Rail
Voltage - Supply (±)	2V ~ 30V, ±1V ~ 15V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 30V	8mV @ 5V	5mV @ 30V	7mV @ 5V	7mV @ 5V	7mV @ 30V	7mV @ 30V	7mV @ 30V	7mV @ 5V	7mV @ 5V	5mV @ 30V
Current - Input Bias (Max)	0.1µA @ 5V	0.4µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V
Current - Output (Typ)	6mA @ 5V	16mA @ 5V	18mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	20mA	16mA @ 5V	16mA @ 5V	18mA @ 5V
Current - Quiescent (Max)	1mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA
Operating Temperature	-55°C ~ 125°C	0°C ~ 70°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C
Package / Case	20-CLCC	8-MSOP	8-SOIC	8-SOIC	8-MSOP	8-MSOP	8-SOIC	8-SOIC	8-TSSOP	8-SOIC	8-MiniSO
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount

Engineering Selection Recommendations

Tier 1 - Direct Functional Equivalents (Preferred for -55°C Minimum Temperature Requirement):

LM193DT (STMicroelectronics) and LM293ST (STMicroelectronics) maintain the full operating temperature range of -55°C to 125°C matching the LM193FKB. Both devices are ROHS3 compliant and feature open-collector, rail-to-rail output configuration. LM193DT is packaged in 8-SOIC format with 78,081 units in stock. LM293ST is available in 8-MiniSO package with 4,558 units in stock. These parts are suitable for applications requiring extended low-temperature operation.

Tier 2 - Extended Supply Voltage Range Substitutes (For -40°C Minimum Applications):

LM2903D, LM2903DGKR, LM2903VDR2G, LM2903WDT, LM2903WYPT, and LM2903YDT all support supply voltage ranges of 2V ~ 36V and ±1V ~ 18V, exceeding the LM193FKB specification. These parts operate from -40°C to 125°C and are ROHS3 compliant. LM2903YDT includes AEC-Q100 automotive qualification. High inventory availability ranges from 29,200 to 282,900 units across variants. Package options include 8-SOIC, 8-MSOP, and 8-TSSOP formats.

Tier 3 - Limited Temperature Range Substitute:

AP393AM8G-13 (Diodes Incorporated) operates only from 0°C to 70°C, restricting use to commercial-grade applications. This part is not suitable for applications requiring -55°C or -40°C minimum operating temperature. Selection of this part is appropriate only when temperature range constraints are not a design requirement.

Compliance Considerations:

All identified substitute parts maintain ROHS3 compliance status. LM2903WYPT and LM2903YDT carry AEC-Q100 automotive qualification, suitable for automotive-grade applications. Moisture sensitivity levels are uniformly rated at MSL 1 (Unlimited) or MSL 3 (168 Hours) across all substitutes, indicating standard handling requirements.

Frequently Asked Questions (FAQ)

Q1: Can the LM193FKB be replaced with an 8-pin package comparator?

A: Yes. The LM193FKB contains two independent comparators. Substitute parts in 8-pin packages (8-SOIC, 8-MSOP, 8-TSSOP) also contain two independent comparators with identical pinout functionality. Package size reduction from 20-LCCC to 8-pin formats does not affect electrical performance when pinout assignments are verified. PCB layout modifications are required to accommodate the smaller package footprint.

Q2: What is the key difference between LM193DT and LM2903 series substitutes?

A: LM193DT maintains the full -55°C to 125°C operating temperature range of the LM193FKB. LM2903 series parts operate from -40°C minimum, which is acceptable for most industrial and commercial applications but not for extended low-temperature environments. Both families share identical dual-comparator architecture and open-collector output configuration.

Q3: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance certification, matching the environmental compliance status of the LM193FKB. This ensures compatibility with RoHS-regulated supply chains and end-use applications.

Q4: Which substitute offers the highest output current capability?

A: LM2903WDT provides 20mA typical output current, exceeding the LM193FKB specification of 6mA. Other LM2903 variants and LM193DT provide 16mA to 18mA output current. Higher output current capability allows direct driving of additional logic stages without intermediate buffering.

Q5: Can AP393AM8G-13 be used in industrial temperature applications?

A: No. AP393AM8G-13 operates only from 0°C to 70°C, restricting use to commercial-grade applications. Industrial and automotive applications requiring -40°C or -55°C minimum operating temperature must use LM2903 series parts or LM193DT respectively.

Q6: What is the significance of AEC-Q100 qualification on LM2903WYPT and LM2903YDT?

A: AEC-Q100 qualification indicates these parts meet automotive industry reliability and quality standards. These variants are suitable for automotive-grade applications where component qualification is mandatory. Non-qualified parts may not be acceptable in regulated automotive designs.

Q7: How does quiescent current differ between the LM193FKB and substitutes?

A: The LM193FKB specifies 1mA maximum quiescent current. All substitute parts specify 2.5mA maximum quiescent current, representing a 2.5x increase in standby power consumption. For battery-powered or low-power applications, this difference may be significant in system-level power budget calculations.

Q8: Are there pinout differences between 20-LCCC and 8-pin package variants?

A: Yes. The 20-LCCC package contains additional pins beyond the core dual-comparator functionality. The 8-pin packages (SOIC, MSOP, TSSOP) contain only the essential comparator signal pins. Successful substitution requires verification that the application uses only the standard dual-comparator pinout without reliance on additional 20-LCCC package features.

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