OP481GSZ-REEL Equivalent & Substitute Parts

Part Overview

The OP481GSZ-REEL is a general purpose operational amplifier integrated circuit manufactured by Analog Devices Inc., configured as a 4-circuit rail-to-rail amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The OP481GSZ-REEL operates across a supply voltage range of 2.7 V to 12 V with an operating temperature range of -40°C to 85°C, making it suitable for low-power analog signal processing applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	OP481GSZ-REEL
Manufacturer	Analog Devices Inc.
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Output Type	Rail-to-Rail
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply Span (Min)	2.7 V
Voltage - Supply Span (Max)	12 V
Operating Temperature	-40°C ~ 85°C
Slew Rate	0.028 V/µs
Gain Bandwidth Product	105 kHz
Current - Input Bias	3 nA
Voltage - Input Offset	100 µV
Current - Supply	3.3 µA (x4 Channels)
Current - Output / Channel	12 mA
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the OP481GSZ-REEL is determined by alignment of critical electrical and mechanical parameters. The primary substitution criteria are:

Direct Equivalency Parameters:

Number of circuits (4-circuit configuration)
Package type (14-SOIC surface mount)
Output type (Rail-to-Rail)
Supply voltage range compatibility (2.7 V to 12 V minimum)
Operating temperature range (-40°C to 85°C minimum)

Substitute Categories:

Category 1: Direct Replacement (Identical Electrical & Mechanical Specifications) The OP481GSZ-REEL7 is a direct equivalent with identical electrical performance and package configuration. The primary distinction is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard reel configuration).

Category 2: Functional Equivalents (Same Circuit Count & Package, Different Performance Characteristics) The TL974ID and TL974IDR are Texas Instruments equivalents with identical 4-circuit, 14-SOIC configuration and rail-to-rail output. These devices exhibit enhanced performance specifications including higher slew rate (5 V/µs vs. 0.028 V/µs), higher gain bandwidth product (12 MHz vs. 105 kHz), and extended operating temperature range (-40°C to 125°C). These characteristics make them suitable for applications requiring improved dynamic performance.

Category 3: Partial Functional Equivalents (Different Circuit Count & Package) The OPA227U/2K5 is a single-circuit, 8-SOIC configuration from Texas Instruments. This substitute is applicable only when individual amplifier channels are required in isolation or when circuit count reduction is acceptable. This device exhibits significantly different electrical characteristics including higher slew rate (2.3 V/µs), higher gain bandwidth product (8 MHz), and higher output current capability (45 mA vs. 12 mA).

Parameter Comparison

Parameter	OP481GSZ-REEL	OP481GSZ-REEL7	TL974ID	TL974IDR	OPA227U/2K5
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Number of Circuits	4	4	4	4	1
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Not Specified
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	8-SOIC
Voltage - Supply Span (Min)	2.7 V	2.7 V	2.7 V	2.7 V	5 V
Voltage - Supply Span (Max)	12 V	12 V	12 V	12 V	36 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Slew Rate	0.028 V/µs	0.028 V/µs	5 V/µs	5 V/µs	2.3 V/µs
Gain Bandwidth Product	105 kHz	105 kHz	12 MHz	12 MHz	8 MHz
Current - Input Bias	3 nA	3 nA	200 nA	200 nA	2.5 nA
Voltage - Input Offset	100 µV	100 µV	1 mV	1 mV	5 µV
Current - Supply	3.3 µA (x4)	3.3 µA (x4)	2 mA (x4)	2 mA (x4)	3.7 mA
Current - Output / Channel	12 mA	12 mA	80 mA	80 mA	45 mA
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

OP481GSZ-REEL7 (Recommended Primary Substitute)

The OP481GSZ-REEL7 is the optimal substitute for direct replacement applications. This device maintains identical electrical specifications and 14-SOIC package configuration while offering active product status and ROHS3 compliance. The OP481GSZ-REEL7 is suitable for designs requiring no modification to existing schematics or PCB layouts. Inventory availability (1276 pcs) supports production requirements.

TL974ID and TL974IDR (Performance-Enhanced Alternatives)

The TL974ID and TL974IDR are functionally equivalent alternatives from Texas Instruments with identical 4-circuit, 14-SOIC configuration and rail-to-rail output. These devices provide enhanced performance characteristics including 178x higher slew rate (5 V/µs vs. 0.028 V/µs), 114x higher gain bandwidth product (12 MHz vs. 105 kHz), and extended operating temperature range to 125°C. These substitutes are applicable when improved dynamic performance is required or when higher temperature operation is necessary. Both variants maintain 2.7 V to 12 V supply compatibility and ROHS3 compliance. The TL974IDR variant offers significantly higher inventory availability (20138 pcs).

OPA227U/2K5 (Limited Substitution Scope)

The OPA227U/2K5 is applicable only in applications where single-channel amplification is required or where circuit count reduction is acceptable. This device operates with a minimum supply voltage of 5 V, which exceeds the 2.7 V minimum of the OP481GSZ-REEL, restricting its use in low-voltage applications. The 8-SOIC package requires PCB layout modification. MSL rating of 3 (168 Hours) requires controlled moisture handling during assembly. This substitute is not recommended for direct replacement of 4-circuit configurations.

Frequently Asked Questions (FAQ)

Q: Can the OP481GSZ-REEL7 be used as a direct replacement without PCB modification?

A: Yes. The OP481GSZ-REEL7 maintains identical electrical specifications, 14-SOIC package configuration, and pin assignment. No schematic or PCB layout changes are required. The primary difference is packaging format (Tape & Reel) and active product status.

Q: What are the key differences between the OP481GSZ-REEL and TL974ID/TL974IDR?

A: Both devices share identical 4-circuit, 14-SOIC configuration and 2.7 V to 12 V supply range. The TL974 series provides significantly higher performance: 178x faster slew rate (5 V/µs vs. 0.028 V/µs), 114x higher gain bandwidth product (12 MHz vs. 105 kHz), 67x higher input bias current (200 nA vs. 3 nA), and 7x higher output current per channel (80 mA vs. 12 mA). The TL974 series also extends operating temperature to 125°C. These differences make TL974 devices suitable for applications requiring improved dynamic response and higher temperature operation.

Q: Is the OPA227U/2K5 suitable for replacing the OP481GSZ-REEL in all applications?

A: No. The OPA227U/2K5 is a single-circuit device in an 8-SOIC package, compared to the 4-circuit, 14-SOIC OP481GSZ-REEL. The minimum supply voltage is 5 V, which is incompatible with applications requiring 2.7 V operation. PCB layout modification is required due to different package type. This substitute is applicable only when individual amplifier channels are required in isolation.

Q: What is the significance of the MSL rating difference between OP481GSZ-REEL and OPA227U/2K5?

A: The OP481GSZ-REEL and its direct equivalent OP481GSZ-REEL7 have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and assembly. The OPA227U/2K5 has MSL 3 (168 Hours), requiring controlled moisture exposure during manufacturing. This necessitates baking procedures and controlled assembly environments for the OPA227U/2K5.

Q: Are all substitute parts ROHS3 compliant?

A: The OP481GSZ-REEL7, TL974ID, and TL974IDR are ROHS3 compliant. The original OP481GSZ-REEL does not specify RoHS status. The OPA227U/2K5 is ROHS3 compliant. All active substitutes meet current environmental compliance requirements.

Q: Which substitute offers the best inventory availability?

A: The TL974IDR offers the highest inventory availability at 20138 pcs. The TL974ID provides 2192 pcs, and the OP481GSZ-REEL7 provides 1276 pcs. The original OP481GSZ-REEL has 1121 pcs available but is obsolete.

Q: Can the TL974 series be used in low-voltage applications below 5 V?

A: Yes. The TL974ID and TL974IDR maintain the same 2.7 V minimum supply voltage as the OP481GSZ-REEL, making them suitable for low-voltage applications. The OPA227U/2K5 requires a minimum of 5 V and is not suitable for applications below this threshold.

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