LMC6494AEMX Equivalent & Substitute Parts

Part Overview

The LMC6494AEMX 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, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. The LMC6494AEMX operates across a wide supply voltage range of 2.5V to 15.5V with low input bias current and moderate slew rate characteristics suitable for general-purpose analog signal conditioning applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	1.3	V/µs
Gain Bandwidth Product	1.5	MHz
Current - Input Bias	0.15	pA
Voltage - Input Offset	110	µV
Current - Supply (x4 Channels)	2.6	mA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	2.5	V
Voltage - Supply Span (Max)	15.5	V
Operating Temperature	-40 to 125	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the LMC6494AEMX is determined by the following critical parameters: four independent amplifier circuits, rail-to-rail output capability, 14-SOIC surface mount package, and compatible supply voltage range. The substitute parts are grouped into two categories based on electrical performance alignment:

Category 1: Direct Electrical Equivalents — Parts maintaining CMOS amplifier topology with slew rate and gain-bandwidth product within the operational envelope of the original device. These include the LMC6494AEMX/NOPB (direct variant), TS914AIDT, TS914AIYDT, and TS914IDT from STMicroelectronics.

Category 2: Functional Alternatives — Parts offering four-circuit amplification in 14-SOIC packaging with rail-to-rail output but with different electrical characteristics. These include the MCP6H04-E/SL and MCP6H04T-E/SL (general-purpose amplifiers), ALD4706SBL (low-power CMOS), and MAX4395ESD+ (video amplifier with higher bandwidth).

All substitute parts share the following mandatory compatibility criteria:

Four independent amplifier circuits
Rail-to-rail output configuration
14-SOIC (0.154", 3.90mm Width) package
Surface mount technology
Active product status or manufacturer-recommended alternatives

Parameter Comparison

Parameter	LMC6494AEMX	LMC6494AEMX/NOPB	TS914AIDT	TS914AIYDT	TS914IDT	TS924IYDT	MCP6H04-E/SL	MCP6H04T-E/SL	ALD4706SBL	MAX4395ESD+
Amplifier Type	CMOS	CMOS	CMOS	CMOS	CMOS	General Purpose	General Purpose	General Purpose	CMOS	Voltage Feedback
Number of Circuits	4	4	4	4	4	4	4	4	4	4
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	1.3	1.3	1	1	1	1.3	0.8	0.8	0.17	500
Gain Bandwidth Product (MHz)	1.5	1.5	1.4	1.4	1.4	4	1.2	1.2	0.2	85
Current - Input Bias (pA)	0.15	0.15	1	1	1	15 nA	10	10	0.1	—
Voltage - Input Offset (µV)	110	110	5000	5000	10000	3000	700	700	10000	—
Current - Supply (mA)	2.6	2.6	0.23	0.23	0.23	1	0.135	0.135	0.12	6
Current - Output / Channel (mA)	30	30	60	60	60	80	50	50	0.2	95
Voltage - Supply Span Min (V)	2.5	2.5	2.7	2.7	2.7	2.7	3.5	3.5	2	4.5 / ±2.25
Voltage - Supply Span Max (V)	15.5	15.5	16	16	16	12	16	16	10	11 / ±5.5
Operating Temperature (°C)	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	0 to 70	—
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LMC6494AEMX/NOPB

The LMC6494AEMX/NOPB is the direct manufacturer variant of the obsolete LMC6494AEMX, produced by National Semiconductor. This part maintains identical electrical specifications and is classified as active product status. Selection of this part eliminates all compatibility risk and provides the most direct replacement path.

Secondary Recommendations for Active Designs:

TS914AIDT, TS914AIYDT, and TS914IDT — STMicroelectronics CMOS amplifiers with automotive-grade qualification (AEC-Q100) and ROHS3 compliance. These parts offer slew rate of 1V/µs and gain-bandwidth product of 1.4 MHz, closely matching the original device performance envelope. Supply voltage range extends to 16V maximum, providing broader compatibility. Higher output current capability (60 mA per channel) supports increased load driving requirements.

TS924IYDT — STMicroelectronics general-purpose amplifier with automotive qualification. This part offers enhanced gain-bandwidth product (4 MHz) and slew rate (1.3V/µs) matching the original specification. Supply voltage maximum is limited to 12V, requiring verification against application requirements. Input bias current is specified as 15 nanoamperes, significantly higher than the original 0.15 picoamperes.

MCP6H04-E/SL and MCP6H04T-E/SL — Microchip Technology general-purpose amplifiers with ROHS3 compliance and extended temperature range (-40°C to 125°C). These parts provide supply voltage range of 3.5V to 16V and moderate slew rate (0.8V/µs). Higher input offset voltage (700 µV) and input bias current (10 pA) represent trade-offs against lower supply current consumption (135 µA total).

ALD4706SBL — Advanced Linear Devices CMOS amplifier with lowest supply current consumption (120 µA total). This part is suitable for ultra-low-power applications but exhibits significantly reduced slew rate (0.17V/µs), gain-bandwidth product (200 kHz), and operating temperature range limited to 0°C to 70°C. Supply voltage maximum is restricted to 10V.

MAX4395ESD+ — Analog Devices/Maxim Integrated video amplifier with exceptional slew rate (500V/µs) and gain-bandwidth product (85 MHz). This part is suitable for high-speed signal conditioning applications. Supply voltage specifications differ from the original device, requiring careful application verification.

Frequently Asked Questions (FAQ)

Q: Can the LMC6494AEMX be directly replaced with any of these substitute parts?

A: The LMC6494AEMX/NOPB provides direct replacement with identical electrical specifications and active product status. Other substitute parts require application-level verification of electrical performance requirements, particularly slew rate, gain-bandwidth product, supply voltage range, and output current capability.

Q: What is the primary reason for identifying substitute parts for the LMC6494AEMX?

A: The LMC6494AEMX is classified as obsolete product status. Substitute parts are identified to support new designs and ongoing production where the original device is no longer available from manufacturers or authorized distributors.

Q: Are all substitute parts compatible with the same printed circuit board layout?

A: All substitute parts share the 14-SOIC (0.154", 3.90mm Width) surface mount package specification, enabling direct pin-compatible replacement on existing printed circuit boards without layout modification.

Q: Which substitute part offers the lowest power consumption?

A: The ALD4706SBL offers the lowest supply current consumption at 120 µA total (30 µA per channel). This part is suitable for battery-powered and energy-constrained applications. However, reduced slew rate (0.17V/µs) and gain-bandwidth product (200 kHz) must be verified against application requirements.

Q: Which substitute parts carry automotive qualification?

A: The TS914AIDT, TS914AIYDT, TS914IDT, and TS924IYDT from STMicroelectronics carry automotive-grade qualification with AEC-Q100 certification. These parts are suitable for automotive and industrial applications requiring enhanced reliability standards.

Q: What is the difference between MCP6H04-E/SL and MCP6H04T-E/SL?

A: Both parts are functionally identical with identical electrical specifications. The primary difference is packaging: MCP6H04-E/SL is supplied in tube packaging, while MCP6H04T-E/SL is supplied in tape and reel format. Selection depends on assembly process requirements and volume considerations.

Q: How does the MAX4395ESD+ differ from the original LMC6494AEMX?

A: The MAX4395ESD+ is a video amplifier with significantly higher slew rate (500V/µs) and gain-bandwidth product (85 MHz), making it suitable for high-speed signal conditioning. Supply voltage specifications differ, requiring application verification. This part is not recommended for general-purpose low-frequency applications where the original device specifications are adequate.

Q: Are all substitute parts RoHS compliant?

A: The LMC6494AEMX is RoHS non-compliant. All substitute parts listed carry ROHS3 compliance certification, meeting current environmental and regulatory requirements for new product designs.

Q: What supply voltage range is common across all substitute parts?

A: No single supply voltage range is common across all substitute parts. The LMC6494AEMX/NOPB maintains the original 2.5V to 15.5V range. The TS914 series extends to 16V maximum. The MCP6H04 series requires minimum 3.5V. The ALD4706SBL is limited to 10V maximum. Application supply voltage requirements must be verified against each candidate part.

Q: Which substitute part most closely matches the original LMC6494AEMX electrical performance?

A: The TS914AIDT and TS914AIYDT most closely match the original device with slew rate of 1V/µs and gain-bandwidth product of 1.4 MHz. The LMC6494AEMX/NOPB provides identical electrical specifications and is the recommended direct replacement.

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