MAX478EPA Equivalent & Substitute Parts

Part Overview

The MAX478EPA is a general-purpose operational amplifier featuring two circuits in a differential output configuration, manufactured by Analog Devices Inc./Maxim Integrated. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MAX478EPA operates across a wide supply voltage range of 3V to 30V with low input bias current and moderate slew rate characteristics suitable for general-purpose amplification applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Output Type	Differential	—
Slew Rate	0.04	V/µs
Gain Bandwidth Product	85	kHz
Current - Input Bias	3	nA
Voltage - Input Offset	50	µV
Current - Supply	13	µA (x2 Channels)
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	30	V
Operating Temperature Range	-40 to 85	°C
Package / Case	8-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution for the MAX478EPA is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Amplifier Type: General Purpose
Number of Circuits: 2
Package / Case: 8-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Slew Rate: 0.04 V/µs
Gain Bandwidth Product: 85 kHz
Current - Input Bias: 3 nA

Acceptable Variation Parameters:

Voltage - Input Offset: Maximum 100 µV (original: 50 µV)
Current - Supply: Maximum 17 µA per channel (original: 13 µA)
Voltage - Supply Span (Min): Minimum 5 V (original: 3 V)
Operating Temperature Range: May be narrower than original

The substitute parts LT1178IN8#PBF and LT1178CN8#PBF meet these criteria while offering improved product status and compliance certifications.

Parameter Comparison

Parameter	MAX478EPA	LT1178IN8#PBF	LT1178CN8#PBF
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active
Amplifier Type	General Purpose	General Purpose	General Purpose
Number of Circuits	2	2	2
Slew Rate	0.04 V/µs	0.04 V/µs	0.04 V/µs
Gain Bandwidth Product	85 kHz	85 kHz	85 kHz
Current - Input Bias	3 nA	3 nA	3 nA
Voltage - Input Offset	50 µV	100 µV	100 µV
Current - Supply	13 µA (x2 Channels)	17 µA (x2 Channels)	17 µA (x2 Channels)
Voltage - Supply Span (Min)	3 V	5 V	5 V
Voltage - Supply Span (Max)	30 V	30 V	30 V
Operating Temperature Range	-40 to 85°C	-40 to 85°C	0 to 70°C
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LT1178IN8#PBF is suitable for applications requiring the full industrial temperature range (-40°C to 85°C). This part maintains compatibility with the MAX478EPA across all critical electrical parameters while offering active product status and ROHS3 compliance. The LT1178IN8#PBF accommodates the minimum supply voltage requirement of 5V, which is acceptable for most general-purpose amplifier applications that originally specified 3V minimum.

LT1178CN8#PBF is the manufacturer-recommended substitute and is suitable for applications operating within the commercial temperature range (0°C to 70°C). This part provides the same electrical performance as LT1178IN8#PBF with active product status and ROHS3 compliance. Selection of LT1178CN8#PBF is appropriate when the narrower operating temperature range meets application requirements.

Both substitute parts eliminate the obsolescence risk associated with MAX478EPA while providing improved regulatory compliance through ROHS3 certification. The 5V minimum supply voltage requirement must be verified against circuit design specifications.

Frequently Asked Questions (FAQ)

Q: Can LT1178IN8#PBF or LT1178CN8#PBF be used as direct pin-for-pin replacements for MAX478EPA?

A: Yes. Both substitute parts share identical 8-DIP package geometry (0.300", 7.62mm) and through-hole mounting configuration. Pin assignments are compatible for general-purpose amplifier applications.

Q: What is the difference between LT1178IN8#PBF and LT1178CN8#PBF?

A: The primary difference is operating temperature range. LT1178IN8#PBF operates from -40°C to 85°C (industrial grade), while LT1178CN8#PBF operates from 0°C to 70°C (commercial grade). Both parts are electrically identical and ROHS3 compliant.

Q: Why does the minimum supply voltage differ between MAX478EPA and the substitute parts?

A: The MAX478EPA specifies a 3V minimum supply voltage, while LT1178IN8#PBF and LT1178CN8#PBF specify 5V minimum. Circuit designs must operate within the 5V to 30V supply range when using substitute parts.

Q: Are there any performance differences in the electrical specifications?

A: The substitute parts exhibit slightly higher input offset voltage (100 µV versus 50 µV) and higher supply current (17 µA per channel versus 13 µA per channel). These differences are within acceptable tolerances for general-purpose amplifier applications. Slew rate, gain bandwidth product, and input bias current remain identical.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates that the substitute parts meet Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. This is relevant for applications subject to environmental and regulatory compliance requirements.

Q: Is the MAX478EPA still available for procurement?

A: The MAX478EPA is classified as obsolete. Procurement of new original stock may be limited. The active product status of LT1178IN8#PBF and LT1178CN8#PBF ensures long-term availability and supply chain continuity.

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