OP77EZ Equivalent & Substitute Parts

Part Overview

The OP77EZ is a general-purpose operational amplifier manufactured by Analog Devices Inc., housed in an 8-CERDIP through-hole package. This device is classified as an active linear amplifier with a single circuit configuration, designed for general-purpose signal conditioning and amplification applications. The part maintains active product status with 2451 units in current inventory stock.

Substitute parts become necessary when design requirements shift toward surface-mount assembly, enhanced performance specifications, or alternative thermal operating ranges. The OP77EZ can be replaced with functionally equivalent alternatives that maintain compatibility with the core application while offering different packaging, performance, or environmental characteristics.

Substiute Parts

OP77EZ

Analog Devices Inc.In Stock: 2557OP77EZ Datasheet

Current PartRFQ

ADA4077-1ARZ

Analog Devices Inc.In Stock: 2359ADA4077-1ARZ Datasheet

SimilarRFQ

ADA4177-1ARMZ

Analog Devices Inc.In Stock: 55905ADA4177-1ARMZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OP77EZ is determined by alignment across the following critical parameters:

Functional Equivalence Criteria:

• Amplifier Type: General Purpose
• Number of Circuits: 1
• Supply Voltage Range: Minimum 5 V to 6 V; Maximum 30 V to 36 V

Performance Considerations:

• Slew Rate: 0.3 V/µs (baseline); substitutes may exceed this specification
• Gain Bandwidth Product: 600 kHz (baseline); substitutes may exceed this specification
• Input Bias Current: 1.2 nA (baseline); substitutes may be lower
• Input Offset Voltage: 10 µV (baseline); substitutes may be lower

Packaging & Environmental:

• Mounting Type: Through Hole (primary) or Surface Mount (alternative)
• Operating Temperature: -25°C ~ 85°C (baseline); substitutes may extend to -40°C ~ 125°C
• RoHS3 Compliance and MSL Level 1 required

The substitute parts ADA4077-1ARZ and ADA4177-1ARMZ maintain functional equivalence as single-circuit general-purpose amplifiers within compatible supply voltage ranges, while offering enhanced performance specifications and alternative packaging options.

Parameter Comparison

Engineering Selection Recommendations

OP77EZ Selection: Select the OP77EZ when through-hole mounting is required for breadboard prototyping, legacy circuit board designs, or applications where manual soldering is preferred. This part maintains ROHS3 compliance and unlimited moisture sensitivity rating, suitable for standard industrial environments.

ADA4077-1ARZ Selection: The ADA4077-1ARZ provides surface-mount packaging in 8-SOIC format with enhanced performance characteristics including 1.2 V/µs slew rate and 3.6 MHz gain bandwidth product. This substitute is appropriate for compact PCB designs requiring improved dynamic response. Note that maximum supply voltage is limited to 30 V compared to the OP77EZ maximum of 36 V. Extended operating temperature range of -40°C ~ 125°C supports wider environmental applications. ROHS3 compliance and MSL Level 1 rating maintained.

ADA4177-1ARMZ Selection: The ADA4177-1ARMZ offers the most compact surface-mount packaging (8-MSOP) with rail-to-rail output capability and superior input offset voltage specification of 3 µV. This part delivers 1.5 V/µs slew rate and 3.5 MHz gain bandwidth product. Maximum supply voltage extends to 36 V, matching the OP77EZ specification. Extended operating temperature range of -40°C ~ 125°C and lowest input bias current of 300 pA support precision applications. ROHS3 compliance and MSL Level 1 rating maintained. Highest inventory availability at 55,855 units.

All three parts maintain active product status, ROHS3 compliance, and MSL Level 1 rating, ensuring regulatory and environmental compatibility across substitution scenarios.

Frequently Asked Questions (FAQ)

Q: Can the ADA4077-1ARZ directly replace the OP77EZ in existing through-hole PCB designs?

A: No. The ADA4077-1ARZ uses surface-mount 8-SOIC packaging while the OP77EZ uses through-hole 8-CDIP packaging. PCB layout and footprint modifications are required. For through-hole designs, the OP77EZ remains the appropriate selection.

Q: What is the maximum supply voltage difference between these parts?

A: The OP77EZ and ADA4177-1ARMZ support 36 V maximum supply voltage. The ADA4077-1ARZ is limited to 30 V maximum. Applications requiring supply voltages between 30 V and 36 V must use either the OP77EZ or ADA4177-1ARMZ.

Q: Does the ADA4177-1ARMZ rail-to-rail output provide functional advantages over the OP77EZ?

A: Rail-to-rail output capability extends the usable output voltage range to the supply rails, which may improve signal utilization in low-supply-voltage applications. The OP77EZ does not specify rail-to-rail output. This is an enhanced feature of the ADA4177-1ARMZ, not a requirement for substitution.

Q: Are all three parts suitable for industrial temperature applications?

A: The OP77EZ operates from -25°C ~ 85°C. Both ADA4077-1ARZ and ADA4177-1ARMZ extend the operating range to -40°C ~ 125°C, providing broader temperature coverage for industrial and automotive environments.

Q: What is the significance of the input bias current differences?

A: The OP77EZ specifies 1.2 nA input bias current. The ADA4077-1ARZ and ADA4177-1ARMZ specify 400 pA and 300 pA respectively, representing lower input bias current. Lower input bias current reduces errors in high-impedance signal conditioning circuits. This is an enhanced specification in the substitute parts.

Q: Can the OP77EZ be used in applications designed for the ADA4177-1ARMZ?

A: Functional compatibility exists for applications within the OP77EZ operating specifications. However, the OP77EZ offers lower performance (600 kHz vs. 3.5 MHz gain bandwidth product, 0.3 V/µs vs. 1.5 V/µs slew rate) and narrower operating temperature range (-25°C ~ 85°C vs. -40°C ~ 125°C). Use the OP77EZ only when performance requirements align with its specifications.

Q: Are moisture sensitivity and RoHS compliance identical across all three parts?

A: Yes. All three parts maintain MSL Level 1 (Unlimited) moisture sensitivity rating and ROHS3 compliance, ensuring equivalent environmental and regulatory handling requirements.

Q: Which substitute part offers the best overall performance?

A: The ADA4177-1ARMZ provides the highest performance specifications with 1.5 V/µs slew rate, 3.5 MHz gain bandwidth product, 3 µV input offset voltage, and rail-to-rail output capability. It also maintains the widest supply voltage range (5 V to 36 V) and extended operating temperature (-40°C ~ 125°C).