LM193H Equivalent & Substitute Parts

Part Overview

The LM193H is a general-purpose dual comparator IC manufactured by Texas Instruments in a TO-99-8 metal can through-hole package. 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), making it suitable for precision voltage comparison applications across industrial and consumer electronics. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are necessary when through-hole TO-99-8 packaging is unavailable, when surface-mount alternatives are preferred for modern PCB designs, or when specific manufacturer sourcing requirements must be met while maintaining functional compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM193H
Manufacturer	Texas Instruments
Type	General Purpose Comparator
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 30V
Current - Input Bias (Max)	0.1µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Propagation Delay (Max)	700ns
Operating Temperature	-55°C ~ 125°C
Package / Case	TO-99-8 Metal Can
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM193H is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Number of Elements: Must be 2 (dual comparator)
Output Type: Must be Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±): Must support 2V ~ 36V, ±1V ~ 18V
Current - Quiescent (Max): Must not exceed 2.5mA
Type: Must be General Purpose Comparator
RoHS Status: Must be ROHS3 Compliant

Package Flexibility: Substitutes are grouped into three categories based on mounting technology: through-hole (TO-99-8), surface-mount SOIC (8-SOIC), and surface-mount compact packages (8-MSOP, 8-TSSOP, 8-UFSON, 8-DFN). All substitute parts maintain identical or superior electrical performance within the specified parameter ranges.

Parametric Equivalents: Parts sharing the same base product number (LM193) with identical electrical specifications but different packaging designations (e.g., LM193H/NOPB) are direct parametric equivalents.

Manufacturer Alternatives: Parts from different manufacturers (STMicroelectronics, onsemi, Rohm Semiconductor, Diodes Incorporated) with the LM2903 base product number are functionally equivalent when all critical electrical parameters align within specified tolerances.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	RoHS
LM193H	Texas Instruments	TO-99-8	Through Hole	2V~36V, ±1V~18V	5mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	ROHS3
LM193H/NOPB	Texas Instruments	TO-99-8	Through Hole	2V~36V, ±1V~18V	5mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	ROHS3
LM193DT	STMicroelectronics	8-SOIC	Surface Mount	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-55°C ~ 125°C	ROHS3
LM193QT	STMicroelectronics	8-UFSON (2x2)	Surface Mount	2V~36V, ±1V~18V	—	—	—	2.5mA	—	ROHS3
LM2903D	STMicroelectronics	8-SOIC	Surface Mount	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM2903DGKR	Rohm Semiconductor	8-MSOP/VSSOP	Surface Mount	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM2903DR2G	onsemi	8-SOIC	Surface Mount	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	ROHS3
LM2903PT	STMicroelectronics	8-TSSOP	Surface Mount	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM2903Q2T	STMicroelectronics	8-DFN (2x2)	Surface Mount	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM2903VDR2G	onsemi	8-SOIC	Surface Mount	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
AP393AM8G-13	Diodes Incorporated	8-MSOP	Surface Mount	2V~36V, ±1V~18V	8mV @ 5V	0.4µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3

Engineering Selection Recommendations

Through-Hole Replacement: LM193H/NOPB is the direct parametric equivalent for through-hole applications, offering identical electrical specifications and the same TO-99-8 package. Selection between LM193H and LM193H/NOPB depends solely on supplier availability and procurement requirements.

Surface-Mount Migration (Industrial Temperature Range): For designs transitioning from through-hole to surface-mount technology while maintaining the full -55°C to 125°C operating range, LM193DT (8-SOIC) is the optimal choice. It preserves the original input offset specification of 5mV @ 30V and supports the complete temperature range.

Surface-Mount General Purpose (Standard Temperature Range): LM2903D, LM2903PT, LM2903Q2T, LM2903DGKR, LM2903DR2G, and LM2903VDR2G are functionally equivalent alternatives with operating ranges limited to -40°C to 125°C (or -40°C to 105°C for onsemi variants). These parts are suitable for applications not requiring the extended -55°C lower temperature limit. All maintain the 2.5mA maximum quiescent current specification and open-collector, rail-to-rail output configuration.

Compact Surface-Mount Packages: LM2903DGKR (8-MSOP), LM2903PT (8-TSSOP), and LM2903Q2T (8-DFN) provide space-constrained PCB solutions with identical electrical performance to larger SOIC packages. Package selection depends on PCB layout requirements and assembly capabilities.

Alternative Manufacturer (Diodes Incorporated): AP393AM8G-13 is a functionally equivalent part from Diodes Incorporated in 8-MSOP package. Input offset specification is 8mV @ 5V (versus 5mV or 7mV for other alternatives) and input bias current is 0.4µA @ 5V (higher than 0.1µA to 0.25µA for other parts). Operating temperature range is limited to 0°C to 70°C. Selection of this part requires confirmation that the higher input offset and bias current specifications, along with the narrower temperature range, are acceptable for the target application.

All substitute parts carry ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original LM193H specifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM193H (through-hole TO-99-8) with a surface-mount LM2903 variant on an existing PCB?

A: No. Through-hole and surface-mount packages require different PCB footprints and assembly processes. LM193H requires through-hole pads and wave soldering or manual insertion. Surface-mount alternatives (LM2903D, LM2903PT, LM2903DGKR, etc.) require SMD pads and reflow soldering. PCB redesign is necessary for package migration.

Q: What is the difference between LM193H and LM193H/NOPB?

A: Both are identical parametric equivalents from Texas Instruments in TO-99-8 through-hole packaging. The "/NOPB" suffix indicates "No Plumbum" (lead-free) RoHS compliance. Electrical specifications, performance, and pinout are identical. Selection depends on supplier availability and procurement specifications.

Q: Are LM2903 parts direct replacements for LM193H?

A: LM2903 parts are functionally equivalent in electrical performance but differ in operating temperature range. LM193H operates from -55°C to 125°C, while most LM2903 variants operate from -40°C to 125°C. If your application requires operation below -40°C, LM193H or LM193DT must be used. For standard industrial applications (above -40°C), LM2903 variants are suitable substitutes.

Q: Why does AP393AM8G-13 have different input offset and bias current specifications?

A: AP393AM8G-13 from Diodes Incorporated is a functionally equivalent comparator but with slightly relaxed specifications. Input offset is 8mV @ 5V (versus 5mV or 7mV for other parts) and input bias current is 0.4µA @ 5V (versus 0.1µA to 0.25µA). These differences are within acceptable tolerances for general-purpose comparator applications but may affect precision in high-accuracy voltage comparison circuits. Verify compatibility with your specific application requirements before selection.

Q: What package should I choose for a new surface-mount design?

A: Selection depends on PCB layout constraints and assembly capabilities. 8-SOIC (LM193DT, LM2903D, LM2903DR2G, LM2903VDR2G) is the most common and widely supported package. 8-TSSOP (LM2903PT) and 8-MSOP (LM2903DGKR, AP393AM8G-13) offer smaller footprints for space-constrained designs. 8-DFN (LM2903Q2T) and 8-UFSON (LM193QT) provide the most compact solutions with exposed pads for improved thermal performance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original LM193H specification. All parts also maintain MSL 1 (unlimited) moisture sensitivity rating.

Q: Can I use LM2903VDR2G or LM2903DR2G if my application requires operation above 105°C?

A: No. onsemi variants (LM2903VDR2G and LM2903DR2G) are rated only to 105°C maximum operating temperature. For applications requiring operation up to 125°C, use LM193H, LM193DT, LM2903D, LM2903PT, LM2903Q2T, or LM2903DGKR instead.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message