MAX427ESA Equivalent & Substitute Parts

Part Overview

The MAX427ESA is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The MAX427ESA features a gain bandwidth product of 8 MHz with a slew rate of 2.8V/µs, suitable for general-purpose amplification applications requiring moderate bandwidth performance.

Due to its obsolete status, identifying equivalent substitute parts is necessary for design continuity, procurement reliability, and long-term product support. Active alternative components with comparable electrical characteristics and identical packaging are available from Analog Devices Inc.

Key Parameters

Parameter	MAX427ESA
Amplifier Type	General Purpose
Number of Circuits	1
Slew Rate	2.8V/µs
Gain Bandwidth Product	8 MHz
Current - Input Bias	10 nA
Voltage - Input Offset	5 µV
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MAX427ESA is determined by the following critical parameters:

Primary Compatibility Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — identical physical footprint required
Mounting Type: Surface Mount — consistent assembly process
Number of Circuits: 1 — single amplifier configuration
Amplifier Type: General Purpose — functional equivalence

Performance Alignment Criteria:

Gain Bandwidth Product: 8 MHz — determines frequency response capability
Slew Rate: 2.8V/µs — defines maximum rate of output voltage change
Operating Temperature Range: -40°C ~ 85°C — thermal operating envelope
Input Bias Current and Input Offset Voltage — precision and noise characteristics

Substitute parts must maintain compatibility across all primary criteria and demonstrate electrical performance within the specified ranges. The following parts satisfy these requirements while offering active product status and improved compliance certifications.

Parameter Comparison

Parameter	MAX427ESA	OP27GSZ	OP27GSZ-REEL	OP27GSZ-REEL7	LT1007IS8	OP07CS8#PBF
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1
Slew Rate	2.8V/µs	2.8V/µs	2.8V/µs	2.8V/µs	2.5V/µs	0.25V/µs
Gain Bandwidth Product	8 MHz	8 MHz	8 MHz	8 MHz	8 MHz	600 kHz
Current - Input Bias	10 nA	15 nA	15 nA	15 nA	15 nA	1.8 nA
Voltage - Input Offset	5 µV	30 µV	30 µV	30 µV	20 µV	60 µV
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Voltage - Supply Span (Min)	—	8 V	8 V	8 V	8 V	6 V
Voltage - Supply Span (Max)	—	36 V	36 V	36 V	36 V	36 V

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The OP27GSZ, OP27GSZ-REEL, and OP27GSZ-REEL7 represent the closest functional equivalents to the MAX427ESA. These parts maintain identical slew rate (2.8V/µs) and gain bandwidth product (8 MHz), matching the core performance specifications. All three variants are manufactured by Analog Devices Inc. and share the same base product number (OP27). The differences between these three parts relate to packaging format only: OP27GSZ is supplied in tube packaging, while OP27GSZ-REEL and OP27GSZ-REEL7 are supplied in cut tape and Digi-Reel formats. All three carry active product status and ROHS3 compliance certification, ensuring long-term availability and regulatory alignment.

Secondary Substitute (Performance Trade-off):

The LT1007IS8 maintains the 8 MHz gain bandwidth product but exhibits a slightly reduced slew rate of 2.5V/µs compared to the MAX427ESA's 2.8V/µs. This represents a minor performance reduction suitable for applications where maximum slew rate is not critical. The LT1007IS8 is active, ROHS3 compliant, and available in 8-SOIC packaging.

Limited Compatibility Substitute:

The OP07CS8#PBF operates at a significantly reduced bandwidth of 600 kHz with a slew rate of 0.25V/µs. This part is suitable only for low-frequency applications and does not meet the performance envelope of the MAX427ESA. Additionally, the OP07CS8#PBF operating temperature range (0°C ~ 70°C) is narrower than the MAX427ESA specification (-40°C ~ 85°C), restricting its use in extended temperature environments.

Compliance and Availability:

All active substitute parts carry ROHS3 compliance and REACH unaffected status, providing regulatory advantages over the obsolete, non-compliant MAX427ESA. Current inventory levels for OP27GSZ variants exceed 44,000 units, ensuring procurement reliability for volume production.

Frequently Asked Questions (FAQ)

Q: Can the OP27GSZ directly replace the MAX427ESA in existing designs?

A: Yes. The OP27GSZ shares identical package geometry (8-SOIC), mounting type (surface mount), and core performance specifications (2.8V/µs slew rate, 8 MHz bandwidth). Pin-for-pin compatibility is maintained. No circuit modifications are required for direct substitution.

Q: What is the difference between OP27GSZ, OP27GSZ-REEL, and OP27GSZ-REEL7?

A: These three parts are electrically identical. The differences are packaging and delivery format only. OP27GSZ is supplied in tube packaging. OP27GSZ-REEL and OP27GSZ-REEL7 are supplied in cut tape and Digi-Reel formats for automated assembly. Select based on your procurement and assembly process requirements.

Q: Why is the LT1007IS8 listed as a substitute if it has lower slew rate?

A: The LT1007IS8 maintains the critical 8 MHz gain bandwidth product and operates within the same temperature range (-40°C ~ 85°C). The 2.5V/µs slew rate, while lower than the MAX427ESA's 2.8V/µs, remains suitable for many general-purpose applications. This part is listed as an alternative for designs where the slight performance reduction is acceptable.

Q: Should I use the OP07CS8#PBF as a substitute?

A: The OP07CS8#PBF is not recommended as a primary substitute due to significantly reduced bandwidth (600 kHz versus 8 MHz) and slew rate (0.25V/µs versus 2.8V/µs). Additionally, its operating temperature range (0°C ~ 70°C) does not cover the full -40°C ~ 85°C envelope of the MAX427ESA. Use this part only if your application operates at low frequencies and within the restricted temperature range.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (OP27GSZ variants and LT1007IS8) carry ROHS3 compliance certification. The original MAX427ESA is RoHS non-compliant. Substitution provides regulatory compliance improvement for new designs and manufacturing processes.

Q: What is the inventory status for substitute parts?

A: OP27GSZ-REEL7 has 50,100 units in stock. OP27GSZ-REEL has 44,113 units in stock. OP27GSZ has 55,200 units in stock. LT1007IS8 has 1,413 units in stock. OP07CS8#PBF has 1,001 units in stock. All parts are available as new original stock.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts operate within the same electrical specifications. The OP27GSZ variants are electrically identical and can be used interchangeably. The LT1007IS8 can be used alongside OP27GSZ variants if the slightly reduced slew rate is acceptable for your circuit topology. Do not mix OP07CS8#PBF with higher-bandwidth parts in the same design due to its significantly different performance characteristics.

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