MAX479ACPD Equivalent & Substitute Parts

Part Overview

The MAX479ACPD 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 MAX479ACPD is classified as an obsolete product, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching electrical specifications and identical package configurations.

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 - Supply Span (Min)	3–5	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0–70 / −40–85	°C
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the MAX479ACPD is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

Number of circuits: 4 channels required
Amplifier type: General purpose classification
Slew rate: 0.04 V/µs
Gain bandwidth product: 85 kHz
Input bias current: 3 nA
Package configuration: 14-DIP (0.300", 7.62mm)
Mounting type: Through hole

Allowable Variations:

Voltage input offset: Range 50–100 µV acceptable
Supply current per channel: 13–17 µA acceptable
Minimum supply voltage: 3 V (MAX479ACPD) to 5 V (LT1179 series) acceptable
Operating temperature range: Extended range (−40–85°C) acceptable for industrial applications
Product status: Active substitutes preferred over obsolete
RoHS compliance: ROHS3 compliant substitutes preferred

The LT1179 series (LT1179ACN#PBF, LT1179CN#PBF, LT1179IN#PBF) meets all critical matching parameters and represents the primary substitute family for the MAX479ACPD.

Parameter Comparison

Parameter	MAX479ACPD	LT1179ACN#PBF	LT1179CN#PBF	LT1179IN#PBF
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active
Number of Circuits	4	4	4	4
Slew Rate (V/µs)	0.04	0.04	0.04	0.04
Gain Bandwidth Product (kHz)	85	85	85	85
Current - Input Bias (nA)	3	3	3	3
Voltage - Input Offset (µV)	50	80	100	100
Current - Supply per Channel (µA)	13	16	17	17
Voltage - Supply Span Min (V)	3	5	5	5
Voltage - Supply Span Max (V)	30	30	30	30
Operating Temperature (°C)	0–70	0–70	0–70	−40–85
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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Substitute: LT1179CN#PBF

The LT1179CN#PBF is the manufacturer-recommended substitute for the MAX479ACPD. This part maintains all critical electrical specifications (slew rate, gain bandwidth product, input bias current, and package configuration) while offering active product status and ROHS3 compliance. Inventory availability (2364 pieces) supports production continuity. The operating temperature range (0–70°C) matches the original MAX479ACPD specification.

Secondary Substitute: LT1179IN#PBF

The LT1179IN#PBF provides an extended operating temperature range (−40–85°C) suitable for industrial and military applications requiring broader thermal performance. All electrical parameters remain equivalent to the MAX479ACPD. This variant is recommended when designs require operation beyond the standard 0–70°C range. Inventory availability (2328 pieces) is comparable to the primary substitute.

Tertiary Substitute: LT1179ACN#PBF

The LT1179ACN#PBF maintains full electrical equivalence with the MAX479ACPD and offers ROHS3 compliance. This variant is suitable for applications where the standard commercial temperature range (0–70°C) is acceptable. Inventory availability (722 pieces) is lower than other LT1179 variants.

Compliance Considerations:

All LT1179 series substitutes are ROHS3 compliant, addressing regulatory requirements for new designs. The MAX479ACPD is RoHS non-compliant and should not be specified for new applications subject to RoHS directives. All substitute parts maintain REACH unaffected status and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the LT1179 series directly replace the MAX479ACPD in existing designs?

A: Yes. The LT1179 series maintains identical electrical specifications (slew rate, gain bandwidth product, input bias current) and package configuration (14-DIP through-hole). Pin-for-pin compatibility is confirmed. No circuit modifications are required for functional substitution.

Q: What is the difference between LT1179CN#PBF, LT1179ACN#PBF, and LT1179IN#PBF?

A: The primary differences are operating temperature range and input offset voltage tolerance. LT1179CN#PBF and LT1179ACN#PBF operate from 0–70°C (matching MAX479ACPD), while LT1179IN#PBF extends to −40–85°C for industrial applications. Input offset voltage varies from 80 µV (LT1179ACN#PBF) to 100 µV (LT1179CN#PBF and LT1179IN#PBF), all within acceptable tolerance for general-purpose amplification.

Q: Is the minimum supply voltage difference (3 V vs. 5 V) a compatibility issue?

A: No. The MAX479ACPD operates from 3 V minimum, while LT1179 variants require 5 V minimum. If your design operates at 3–5 V, verify that the LT1179 minimum specification (5 V) is acceptable. For designs operating above 5 V, no compatibility issue exists. Maximum supply voltage (30 V) is identical across all parts.

Q: Why is RoHS compliance important for substitution?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other markets. The MAX479ACPD is RoHS non-compliant and cannot be used in new designs subject to RoHS directives. All LT1179 substitutes are ROHS3 compliant, ensuring regulatory compliance for current and future production.

Q: What is the impact of increased supply current (13 µA to 16–17 µA per channel)?

A: The LT1179 series draws 16–17 µA per channel compared to 13 µA for the MAX479ACPD. This 3–4 µA increase per channel (12–16 µA total for four channels) is negligible in most applications. Power supply design should account for this marginal increase, but no functional incompatibility results.

Q: Can I use LT1179IN#PBF in applications rated only to 0–70°C?

A: Yes. The LT1179IN#PBF is rated to −40–85°C, which encompasses the 0–70°C range. Using a part with extended temperature rating in a narrower temperature application introduces no risk and provides design margin.

Q: Are there any package or mounting differences between the MAX479ACPD and LT1179 substitutes?

A: No. All parts use identical 14-DIP (0.300", 7.62mm) through-hole packages. PCB layouts, socket compatibility, and mechanical mounting are identical. No hardware modifications are required.

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