MAX479CPD Equivalent & Substitute Parts Reference

Part Overview

The MAX479CPD is a general-purpose operational amplifier integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This device contains four independent amplifier circuits in a 14-pin DIP package and is designed for general-purpose signal conditioning and amplification applications. The MAX479CPD is classified as an obsolete product, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Number of Circuits	4	Channels
Amplifier Type	General Purpose	—
Slew Rate	0.04	V/µs
Gain Bandwidth Product	85	kHz
Current - Input Bias	3	nA
Voltage - Input Offset	50	µV
Current - Supply (per 4 Channels)	13	µA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	30	V
Operating Temperature Range	0 to 70	°C
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MAX479CPD is determined by the following critical parameters: four independent amplifier circuits, general-purpose amplifier classification, 14-pin DIP through-hole package, and electrical specifications including slew rate, gain bandwidth product, input bias current, input offset voltage, and supply voltage range.

The substitute parts are grouped into two categories based on electrical performance characteristics:

Category 1: Direct Electrical Equivalents (LT1179 Series) The LT1179CN#PBF and LT1179IN#PBF maintain identical slew rate (0.04 V/µs) and gain bandwidth product (85 kHz) as the MAX479CPD. These parts are pin-compatible and functionally equivalent for applications where the original performance specifications are required. The LT1179IN#PBF extends the operating temperature range to −40°C to 85°C, providing enhanced performance for industrial and extended-temperature applications.

Category 2: Enhanced Performance Alternatives (LT1079 Series) The LT1079CN#PBF and LT1079IN#PBF offer improved electrical characteristics with higher slew rate (0.1 V/µs) and greater gain bandwidth product (200 kHz). These parts are suitable for applications requiring faster signal response and wider bandwidth while maintaining the same 14-pin DIP package and four-circuit configuration. The LT1079IN#PBF provides the extended operating temperature range (−40°C to 85°C).

All substitute parts are manufactured by Analog Devices Inc., maintain the same package footprint and pinout, and are classified as active products with current RoHS3 compliance.

Parameter Comparison

Parameter	MAX479CPD	LT1179CN#PBF	LT1179IN#PBF	LT1079CN#PBF	LT1079IN#PBF
Manufacturer	Analog Devices Inc./Maxim	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Number of Circuits	4	4	4	4	4
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Slew Rate (V/µs)	0.04	0.04	0.04	0.1	0.1
Gain Bandwidth Product (kHz)	85	85	85	200	200
Current - Input Bias (nA)	3	3	3	6	6
Voltage - Input Offset (µV)	50	100	100	80	70
Current - Supply per 4 Channels (µA)	13	17	17	38	38
Voltage - Supply Span Min (V)	3	5	5	2.2	2.2
Voltage - Supply Span Max (V)	30	30	30	30	30
Operating Temperature (°C)	0 to 70	0 to 70	−40 to 85	0 to 70	−40 to 85
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Electrical Equivalence): The LT1179CN#PBF is the primary direct substitute for the MAX479CPD in applications operating within the 0°C to 70°C temperature range. This part maintains identical slew rate and gain bandwidth product specifications, ensuring functional compatibility in existing circuit designs. The LT1179CN#PBF is an active product with ROHS3 compliance, addressing the obsolescence of the MAX479CPD while maintaining electrical performance parity.

For Extended Temperature Applications: The LT1179IN#PBF extends the operating temperature range to −40°C to 85°C, suitable for industrial and automotive applications requiring broader temperature operation. This part is functionally equivalent to the LT1179CN#PBF with enhanced temperature specifications.

For Enhanced Performance Requirements: The LT1079CN#PBF and LT1079IN#PBF offer superior slew rate (0.1 V/µs versus 0.04 V/µs) and gain bandwidth product (200 kHz versus 85 kHz). These parts are appropriate for applications requiring faster transient response and wider signal bandwidth. The LT1079CN#PBF operates within the standard 0°C to 70°C range, while the LT1079IN#PBF provides extended temperature capability to −40°C to 85°C.

All substitute parts are manufactured by Analog Devices Inc., maintain identical 14-pin DIP package geometry, and are classified as active products with current manufacturing support and RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the LT1179CN#PBF be used as a direct replacement for the MAX479CPD? A: Yes. The LT1179CN#PBF is electrically equivalent to the MAX479CPD, maintaining identical slew rate (0.04 V/µs) and gain bandwidth product (85 kHz). Both parts contain four independent general-purpose amplifier circuits in a 14-pin DIP package with identical pinout. The LT1179CN#PBF is an active product with ROHS3 compliance, addressing the obsolescence of the MAX479CPD.

Q: What is the difference between the LT1179 and LT1079 series? A: The LT1179 series maintains the same electrical performance as the MAX479CPD (0.04 V/µs slew rate, 85 kHz gain bandwidth product). The LT1079 series provides enhanced performance with higher slew rate (0.1 V/µs) and greater gain bandwidth product (200 kHz). Both series are pin-compatible and use the same 14-pin DIP package. Selection depends on whether the application requires equivalent or enhanced performance characteristics.

Q: What is the significance of the temperature grade suffix (CN versus IN)? A: The CN suffix indicates commercial-grade temperature operation (0°C to 70°C). The IN suffix indicates industrial-grade temperature operation (−40°C to 85°C). For applications requiring extended temperature range, select the IN-grade part. For standard commercial applications, the CN-grade part is appropriate.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts (LT1179CN#PBF, LT1179IN#PBF, LT1079CN#PBF, and LT1079IN#PBF) are ROHS3 compliant. The original MAX479CPD is classified as RoHS non-compliant. Substitution with any of these parts addresses both obsolescence and regulatory compliance requirements.

Q: Can the LT1079 series be used in place of the LT1179 series? A: Yes, with design considerations. The LT1079 series offers higher slew rate and gain bandwidth product, making it suitable for applications requiring faster signal response. However, the LT1079 series exhibits higher supply current (38 µA versus 17 µA per four channels) and higher input bias current (6 nA versus 3 nA). Circuit designs must account for these differences in power consumption and input impedance characteristics.

Q: What is the minimum supply voltage for each substitute part? A: The LT1179CN#PBF and LT1179IN#PBF require a minimum supply voltage of 5 V. The LT1079CN#PBF and LT1079IN#PBF operate at a lower minimum supply voltage of 2.2 V. The MAX479CPD operates at a minimum of 3 V. For applications with supply voltages between 3 V and 5 V, the LT1079 series is the appropriate choice.

Q: Are the substitute parts available in the same packaging format? A: Yes. All substitute parts are supplied in 14-pin DIP (0.300", 7.62mm) through-hole packages, identical to the MAX479CPD. The pinout is compatible, allowing direct board-level substitution without circuit modification.

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