LMC6494AEM Equivalent & Substitute Parts

Part Overview

The LMC6494AEM is a CMOS amplifier integrated circuit featuring four independent rail-to-rail output stages in a 14-SOIC surface mount package. This device is classified as obsolete by Texas Instruments, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement. The LMC6494AEM operates across a wide supply voltage range of 2.5V to 15.5V with low input bias current and moderate bandwidth characteristics suitable for general-purpose analog signal conditioning applications.

Substiute Parts

LMC6494AEM

Texas InstrumentsIn Stock: 1361LMC6494AEM Datasheet

Current PartRFQ

LMC6494AEM/NOPB

Texas InstrumentsIn Stock: 1394LMC6494AEM/NOPB Datasheet

DirectRFQ

LMC6494AEMX/NOPB

National SemiconductorIn Stock: 3440LMC6494AEMX/NOPB Datasheet

MFR RecommendedRFQ

MAX4395ESD+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3115MAX4395ESD+T Datasheet

MFR RecommendedRFQ

MCP6H04-E/SL

Microchip TechnologyIn Stock: 12870MCP6H04-E/SL Datasheet

MFR RecommendedRFQ

MCP6H04T-E/SL

Microchip TechnologyIn Stock: 12968MCP6H04T-E/SL Datasheet

MFR RecommendedRFQ

MCP6H74T-E/SL

Microchip TechnologyIn Stock: 770MCP6H74T-E/SL Datasheet

MFR RecommendedRFQ

TS914AIDT

STMicroelectronicsIn Stock: 17964TS914AIDT Datasheet

MFR RecommendedRFQ

TS914AIYDT

STMicroelectronicsIn Stock: 3123TS914AIYDT Datasheet

MFR RecommendedRFQ

TS914IDT

STMicroelectronicsIn Stock: 37148TS914IDT Datasheet

MFR RecommendedRFQ

TS924IDT

STMicroelectronicsIn Stock: 41325TS924IDT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LMC6494AEM is determined by the following critical parameters: four independent amplifier circuits, rail-to-rail output capability, CMOS or general-purpose amplifier topology, 14-SOIC package format, surface mount configuration, and compatible supply voltage range. Parts are grouped into two categories based on substitution compatibility:

Category 1: Direct Electrical Equivalents (CMOS Topology) Parts maintaining CMOS amplifier architecture with matching slew rate (1.0–1.3 V/µs), gain bandwidth product (1.4–1.5 MHz), and supply voltage range (2.5–16 V minimum, 12–16 V maximum). These parts preserve the original electrical characteristics and are suitable for direct replacement in existing designs.

Category 2: Functional Alternatives (General Purpose Topology) Parts utilizing general-purpose amplifier architecture with rail-to-rail output, four circuits, and 14-SOIC packaging. These parts operate within compatible supply voltage ranges but exhibit different slew rates, bandwidth, and current consumption characteristics. Selection requires circuit-level evaluation of performance requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LMC6494AEMX/NOPB The LMC6494AEMX/NOPB from National Semiconductor is the preferred substitute. This part maintains identical electrical specifications to the obsolete LMC6494AEM, including CMOS topology, 1.3 V/µs slew rate, 1.5 MHz gain bandwidth product, and 2.5–15.5 V supply range. The device is classified as active, ensuring long-term availability and supply chain continuity. Packaging and thermal characteristics are identical, permitting direct board-level substitution without design modification.

Secondary Recommendation: TS914AIDT or TS914AIYDT The STMicroelectronics TS914 series (TS914AIDT or TS914AIYDT) provides CMOS amplifier architecture with active product status. These devices operate within compatible supply voltage ranges (2.7–16 V) and maintain four independent rail-to-rail circuits in 14-SOIC packaging. The TS914 series exhibits slightly lower slew rate (1.0 V/µs versus 1.3 V/µs) and marginally lower gain bandwidth product (1.4 MHz versus 1.5 MHz), with reduced supply current consumption (0.23 mA versus 2.6 mA). These parts are suitable for applications where the performance differential is acceptable and automotive-grade qualification (AEC-Q100) is beneficial.

Tertiary Recommendation: MCP6H04-E/SL or MCP6H04T-E/SL The Microchip Technology MCP6H04 series provides general-purpose amplifier topology with four rail-to-rail circuits in 14-SOIC packaging and active product status. These devices operate across 3.5–16 V supply range and feature significantly reduced supply current (0.135 mA). The MCP6H04 exhibits lower slew rate (0.8 V/µs) and reduced gain bandwidth product (1.2 MHz), making these parts suitable for low-power applications where bandwidth requirements are less stringent than the original LMC6494AEM specification.

Not Recommended for Direct Substitution: MAX4395ESD+T The MAX4395ESD+T is a voltage feedback video amplifier with substantially different electrical characteristics, including 500 V/µs slew rate and 85 MHz bandwidth. This device is intended for high-speed video signal processing and is not suitable for general-purpose applications requiring the moderate bandwidth and slew rate of the LMC6494AEM.

Frequently Asked Questions (FAQ)

Q: Can the LMC6494AEMX/NOPB be used as a direct replacement for the LMC6494AEM? A: Yes. The LMC6494AEMX/NOPB maintains identical electrical specifications, package format, and pin configuration. No circuit modifications are required for direct substitution.

Q: What is the primary difference between the TS914 series and the LMC6494AEM? A: The TS914 series operates with lower supply current (0.23 mA versus 2.6 mA), slightly reduced slew rate (1.0 V/µs versus 1.3 V/µs), and marginally lower gain bandwidth product (1.4 MHz versus 1.5 MHz). The TS914 series includes automotive-grade qualification (AEC-Q100). These differences are acceptable in applications where the performance margin is sufficient.

Q: Are the MCP6H04 and MCP6H74 series interchangeable with the LMC6494AEM? A: The MCP6H04 and MCP6H74 series are not direct replacements. Both utilize general-purpose amplifier topology rather than CMOS architecture. The MCP6H04 exhibits lower bandwidth (1.2 MHz) and reduced slew rate (0.8 V/µs), while the MCP6H74 offers higher bandwidth (2.7 MHz) and faster slew rate (2.0 V/µs). Selection depends on specific circuit requirements and performance margins.

Q: What is the significance of the 14-SOIC package specification? A: The 14-SOIC package is a surface mount integrated circuit package with 14 pins, 0.154 inches (3.90 mm) width. All substitute parts listed maintain this identical package format, ensuring mechanical and electrical compatibility with existing printed circuit board layouts.

Q: Does the LMC6494AEMX/NOPB have the same moisture sensitivity level as the original LMC6494AEM? A: Yes. Both devices are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance, ensuring compatibility with environmental and regulatory requirements.

Q: What supply voltage range is common to all substitute parts? A: The minimum common supply voltage across all substitutes is 2.5 V (LMC6494 series) to 3.5 V (MCP6H series). The maximum common supply voltage is 12 V (MCP6H74T-E/SL and TS924IDT) to 16 V (TS914 and MCP6H04 series). Circuit design must account for the specific supply range of the selected substitute.

Q: Can the MAX4395ESD+T be used in place of the LMC6494AEM? A: No. The MAX4395ESD+T is a high-speed video amplifier with 500 V/µs slew rate and 85 MHz bandwidth, substantially exceeding the LMC6494AEM specification. This device is intended for video signal processing applications and is not suitable for general-purpose analog signal conditioning.