MAX494CPD+ Equivalent & Substitute Parts Reference

Part Overview

The MAX494CPD+ is a general-purpose operational amplifier integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This 4-circuit rail-to-rail amplifier is housed in a 14-pin DIP package and operates across a 2.7V to 6V supply voltage range. The device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain functional compatibility through matching package type, pin configuration, supply voltage range, and output drive capability while accommodating performance parameter variations.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	MAX494CPD+	—
Manufacturer	Analog Devices Inc./Maxim Integrated	—
Category	Linear, Amplifiers	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	6	V
Operating Temperature	0 to 70	°C
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MAX494CPD+ is determined by strict adherence to the following critical parameters:

Package Compatibility: All substitute parts must use the 14-DIP (0.300", 7.62mm) through-hole package with identical pin configuration to ensure direct PCB compatibility without layout modifications.

Circuit Count: The device contains 4 operational amplifier circuits. Substitute parts must provide exactly 4 circuits per package.

Output Configuration: Rail-to-rail output capability is required to maintain voltage swing characteristics across the specified supply range.

Supply Voltage Range: Substitute parts must operate within or encompass the 2.7V to 6V supply voltage specification. Parts with extended ranges (such as 2.5V to 5.5V) are acceptable if the overlap includes the original specification.

Mounting Technology: Through-hole mounting is mandatory for direct replacement in existing PCB designs.

Compliance Standards: RoHS3 compliance and REACH unaffected status are required to meet current regulatory requirements.

The substitute parts identified fall into two functional categories: general-purpose amplifiers (TLV2454 series) and CMOS amplifiers (TLV2774 series). Both categories satisfy the core package, circuit count, and output type requirements while offering variations in performance characteristics such as slew rate, gain-bandwidth product, and supply current.

Parameter Comparison

Parameter	MAX494CPD+	TLV2454AIN	TLV2454CN	TLV2454IN	TLV2464AIN	TLV2464CN	TLV2464IN	TLV2774AIN	TLV2774CN	TLV2774IN
Manufacturer	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
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
Package / Case	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Voltage - Supply Span (Min)	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.5 V	2.5 V	2.5 V
Voltage - Supply Span (Max)	6 V	6 V	6 V	6 V	6 V	6 V	6 V	5.5 V	5.5 V	5.5 V
Slew Rate	0.2 V/µs	0.11 V/µs	0.11 V/µs	0.11 V/µs	1.6 V/µs	1.6 V/µs	1.6 V/µs	10.5 V/µs	10.5 V/µs	10.5 V/µs
Gain Bandwidth Product	500 kHz	220 kHz	220 kHz	220 kHz	6.4 MHz	6.4 MHz	6.4 MHz	5.1 MHz	5.1 MHz	5.1 MHz
Current - Input Bias	25 nA	500 pA	500 pA	500 pA	1.3 nA	1.3 nA	1.3 nA	2 pA	2 pA	2 pA
Voltage - Input Offset	200 µV	300 µV	300 µV	300 µV	500 µV	500 µV	500 µV	700 µV	700 µV	700 µV
Current - Supply (x4 Channels)	150 µA	23 µA	23 µA	23 µA	550 µA	550 µA	550 µA	1 mA	1 mA	1 mA
Current - Output / Channel	30 mA	10 mA	10 mA	10 mA	80 mA	80 mA	80 mA	50 mA	50 mA	50 mA
Operating Temperature	0 to 70°C	-40 to 125°C	0 to 70°C	-40 to 125°C	-40 to 125°C	0 to 70°C	-40 to 125°C	-40 to 125°C	0 to 70°C	-40 to 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Last Time Buy	Last Time Buy	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Minimal Performance Impact:

The TLV2454 series (TLV2454AIN, TLV2454CN, TLV2454IN) provides the closest functional match to the MAX494CPD+ in terms of supply current consumption and output drive capability. These parts maintain active product status from Texas Instruments and are fully RoHS3 compliant. The TLV2454CN variant operates within the identical 0°C to 70°C temperature range as the original MAX494CPD+, making it the preferred choice for applications with standard industrial temperature requirements. The TLV2454AIN and TLV2454IN variants extend the operating temperature range to -40°C to 125°C, suitable for extended-temperature applications.

For Applications Requiring Enhanced Performance:

The TLV2464 series (TLV2464AIN, TLV2464CN, TLV2464IN) offers significantly improved slew rate (1.6V/µs versus 0.2V/µs) and gain-bandwidth product (6.4 MHz versus 500 kHz), enabling use in higher-frequency signal processing applications. These parts maintain compatibility with the 2.7V to 6V supply range and provide increased output current capability (80 mA per channel versus 30 mA). The trade-off is increased supply current consumption (550 µA total versus 150 µA).

For Low-Power or High-Speed Applications:

The TLV2774 series (TLV2774AIN, TLV2774CN, TLV2774IN) represents a CMOS implementation with the highest slew rate (10.5V/µs) and gain-bandwidth product (5.1 MHz). These parts feature extremely low input bias current (2 pA) and are designated as Last Time Buy status. The supply voltage range is slightly narrower (2.5V to 5.5V), which encompasses the original 2.7V to 6V specification within the 2.7V to 5.5V overlap region. These parts are suitable for precision instrumentation and low-noise applications.

Temperature Range Considerations:

Select temperature-rated variants based on application requirements. The CN suffix denotes 0°C to 70°C operation (matching the original MAX494CPD+). The AIN and IN suffixes denote -40°C to 125°C operation for extended-temperature environments.

Product Status and Supply Continuity:

The TLV2454 series maintains active status, ensuring long-term availability and supply continuity. The TLV2774 series is designated Last Time Buy, indicating limited future availability. For new designs requiring extended production life, the TLV2454 series is recommended.

Frequently Asked Questions (FAQ)

Q: Can the TLV2454 series be used as a direct pin-for-pin replacement for the MAX494CPD+?

A: Yes. The TLV2454 series shares identical 14-DIP package pinout, 4-circuit configuration, rail-to-rail output, and through-hole mounting. No PCB modifications are required. However, the lower slew rate (0.11V/µs versus 0.2V/µs) and reduced output current per channel (10 mA versus 30 mA) must be verified against circuit requirements.

Q: What is the key difference between the TLV2454 and TLV2464 series?

A: The TLV2464 series provides higher performance with 1.6V/µs slew rate and 6.4 MHz gain-bandwidth product, compared to 0.11V/µs and 220 kHz for the TLV2454 series. The TLV2464 also delivers 80 mA output current per channel versus 10 mA. These improvements come at the cost of increased supply current (550 µA versus 23 µA total). Select TLV2464 for high-frequency or high-current applications; select TLV2454 for low-power applications.

Q: Are the TLV2774 series parts suitable for the same applications as the MAX494CPD+?

A: The TLV2774 series is functionally compatible in package, circuit count, and output type. However, the supply voltage range is 2.5V to 5.5V, which does not fully encompass the original 5.5V to 6V upper range. Verify that your application operates within 2.5V to 5.5V before selecting TLV2774 parts. The TLV2774 series offers superior performance (10.5V/µs slew rate, 5.1 MHz bandwidth) and extremely low input bias current (2 pA), making it ideal for precision applications within the supported voltage range.

Q: What does "Last Time Buy" status mean for the TLV2774 series?

A: Last Time Buy indicates that Texas Instruments has announced end-of-life for this product line. Existing inventory is available for purchase, but no new production is planned. For applications requiring long-term component availability, the TLV2454 series (Active status) is recommended.

Q: How do I select between the AIN, CN, and IN temperature variants?

A: The CN suffix specifies 0°C to 70°C operation, matching the original MAX494CPD+ temperature range. The AIN and IN suffixes specify -40°C to 125°C operation. Select CN variants for standard industrial applications operating within 0°C to 70°C. Select AIN or IN variants for extended-temperature environments, automotive applications, or military specifications requiring -40°C to 125°C operation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (TLV2454 series, TLV2464 series, and TLV2774 series) are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for new designs and production.

Q: Can I use the TLV2464 series in place of the TLV2454 series?

A: Yes, with circuit verification. The TLV2464 series is a functional superset offering higher performance. However, the increased supply current (550 µA versus 23 µA) and higher input offset voltage (500 µV versus 300 µV) must be evaluated. If your circuit is designed for the lower performance of TLV2454, upgrading to TLV2464 is generally safe but may require power supply capacity verification.

Q: What is the inventory status of these substitute parts?

A: Current inventory levels are: TLV2454AIN (895 pcs), TLV2454CN (1900 pcs), TLV2454IN (1059 pcs), TLV2464AIN (664 pcs), TLV2464CN (907 pcs), TLV2464IN (963 pcs), TLV2774AIN (817 pcs), TLV2774CN (4100 pcs), TLV2774IN (1238 pcs). Inventory levels are subject to change; verify current availability with your supplier.

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