OP279GS-REEL Equivalent & Substitute Parts

Part Overview

The OP279GS-REEL is a buffer amplifier integrated circuit manufactured by Analog Devices Inc., configured as a 2-circuit rail-to-rail buffer in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The OP279GS-REEL operates across a 4.5 V to 12 V supply range with a slew rate of 3 V/µs and gain bandwidth product of 5 MHz, making it suitable for buffering and signal conditioning applications requiring moderate bandwidth and rail-to-rail output capability.

Key Parameters

Parameter	Value
Manufacturer Part Number	OP279GS-REEL
Manufacturer	Analog Devices Inc.
Category	Linear, Amplifiers
Amplifier Type	Buffer
Number of Circuits	2
Output Type	Rail-to-Rail
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	3 V/µs
Gain Bandwidth Product	5 MHz
Current - Input Bias	300 nA
Voltage - Input Offset	4 mV
Current - Output / Channel	50 mA
Voltage - Supply Span (Min)	4.5 V
Voltage - Supply Span (Max)	12 V
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the OP279GS-REEL is determined by the following critical parameters: package type (8-SOIC surface mount), number of circuits (2), output type (rail-to-rail), supply voltage range compatibility (4.5 V to 12 V minimum), operating temperature range (-40°C to 85°C minimum), and output current capability (50 mA per channel minimum).

The substitute parts are grouped into two categories:

Direct Functional Equivalent: OP279GSZ-REEL is the active production variant of the same base product (OP279) with identical electrical specifications and packaging. This part maintains buffer amplifier topology with matching slew rate, bandwidth, and output characteristics.

Similar Functional Alternatives: ALD2732SAL, ALD2732ASAL, OPA2743UA/2K5, and TSH22IDT are general-purpose or CMOS amplifiers that share the 8-SOIC package, 2-circuit configuration, and rail-to-rail output capability. These parts operate within overlapping supply voltage ranges and temperature specifications, though with variations in slew rate, bandwidth, input bias current, and output current that must be evaluated for specific application requirements.

Parameter Comparison

Parameter	OP279GS-REEL	OP279GSZ-REEL	ALD2732SAL	ALD2732ASAL	OPA2743UA/2K5	TSH22IDT
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Advanced Linear Devices Inc.	Advanced Linear Devices Inc.	Texas Instruments	STMicroelectronics
Amplifier Type	Buffer	Buffer	General Purpose	General Purpose	CMOS	General Purpose
Number of Circuits	2	2	2	2	2	2
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Not Specified
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
Slew Rate	3 V/µs	3 V/µs	1.9 V/µs	1.9 V/µs	10 V/µs	15 V/µs
Gain Bandwidth Product	5 MHz	5 MHz	1.5 MHz	1.5 MHz	7 MHz	25 MHz
Current - Input Bias	300 nA	300 nA	10 pA	10 pA	1 pA	100 nA
Voltage - Input Offset	4 mV	4 mV	2 mV	600 µV	1.5 mV	2.5 mV
Current - Output / Channel	50 mA	50 mA	Not Specified	Not Specified	20 mA	37 mA
Voltage - Supply Span (Min)	4.5 V	4.5 V	4 V	4 V	3.5 V	3 V
Voltage - Supply Span (Max)	12 V	12 V	10 V	10 V	12 V	30 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)

Engineering Selection Recommendations

OP279GSZ-REEL is the primary recommended substitute for the obsolete OP279GS-REEL. This part is manufactured by Analog Devices Inc. and maintains identical electrical specifications, package configuration, and operating characteristics. The OP279GSZ-REEL is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating, providing direct compatibility for existing designs without circuit modification.

OPA2743UA/2K5 is suitable for applications where higher slew rate (10 V/µs) and gain bandwidth product (7 MHz) are beneficial. This CMOS amplifier operates within the same temperature range (-40°C to 85°C) and supply voltage range (3.5 V to 12 V). The trade-off is reduced output current per channel (20 mA versus 50 mA) and MSL rating of 2 (1 Year). This part is ROHS3 compliant and in active production.

TSH22IDT offers the highest slew rate (15 V/µs) and gain bandwidth product (25 MHz) among the alternatives, with extended operating temperature range (-40°C to 125°C) and wider supply voltage range (3 V to 30 V). Output current per channel is 37 mA. This part is manufactured by STMicroelectronics, is ROHS3 compliant, and in active production status with unlimited moisture sensitivity.

ALD2732SAL and ALD2732ASAL are general-purpose amplifiers with lower slew rate (1.9 V/µs) and bandwidth (1.5 MHz) compared to the OP279GS-REEL. These parts operate within a narrower supply voltage range (4 V to 10 V) and reduced temperature range (0°C to 70°C). Selection of these alternatives is appropriate only for applications with reduced bandwidth requirements and operating conditions within the specified temperature and voltage limits.

Frequently Asked Questions (FAQ)

Q: Can OP279GSZ-REEL be used as a direct replacement for OP279GS-REEL?

A: Yes. OP279GSZ-REEL is the active production equivalent of OP279GS-REEL with identical electrical specifications, package type (8-SOIC), circuit count (2), and operating characteristics. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel versus standard reel). No circuit modifications are required.

Q: What are the key differences between buffer amplifiers and general-purpose amplifiers in this comparison?

A: The OP279GS-REEL and OP279GSZ-REEL are specifically configured as buffer amplifiers, optimized for impedance transformation and signal isolation. General-purpose amplifiers (ALD2732SAL, ALD2732ASAL, TSH22IDT) offer broader application flexibility but may have different frequency response characteristics and input/output impedance specifications. Buffer topology is typically preferred for applications requiring high input impedance and low output impedance.

Q: Are there output current limitations when substituting with OPA2743UA/2K5?

A: Yes. The OPA2743UA/2K5 provides 20 mA output current per channel, compared to 50 mA for the OP279GS-REEL. Applications requiring output currents exceeding 20 mA per channel must use OP279GSZ-REEL, TSH22IDT (37 mA), or external buffering stages.

Q: What is the impact of operating temperature range differences?

A: The OP279GS-REEL operates from -40°C to 85°C. ALD2732SAL and ALD2732ASAL are limited to 0°C to 70°C, making them unsuitable for applications requiring full military or extended temperature range operation. TSH22IDT extends to 125°C, providing enhanced thermal margin for high-temperature environments.

Q: How do supply voltage ranges affect substitution decisions?

A: The OP279GS-REEL requires 4.5 V to 12 V supply. OPA2743UA/2K5 and TSH22IDT accept lower minimum voltages (3.5 V and 3 V respectively), enabling operation in lower-voltage systems. ALD2732SAL and ALD2732ASAL are limited to 4 V to 10 V, restricting use in 12 V systems. Verify supply voltage compatibility with system requirements before selection.

Q: What is the significance of slew rate differences among substitute parts?

A: Slew rate determines the maximum rate of output voltage change. The OP279GS-REEL has 3 V/µs slew rate. TSH22IDT (15 V/µs) and OPA2743UA/2K5 (10 V/µs) support faster signal transitions, beneficial for high-frequency applications. ALD2732SAL and ALD2732ASAL (1.9 V/µs) are slower, suitable only for lower-bandwidth applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (OP279GSZ-REEL, ALD2732SAL, ALD2732ASAL, OPA2743UA/2K5, and TSH22IDT) are ROHS3 compliant. The original OP279GS-REEL RoHS status is not specified in the provided data.

Q: What packaging format differences exist among these parts?

A: All parts use 8-SOIC surface mount packages with identical physical dimensions (0.154" width, 3.90mm). Packaging format variations include Tape & Reel (OP279GSZ-REEL, OPA2743UA/2K5, TSH22IDT) and Tube (ALD2732SAL, ALD2732ASAL). These differences affect procurement and handling but do not impact electrical compatibility or PCB layout.

Q: Which substitute provides the best overall compatibility with the original OP279GS-REEL?

A: OP279GSZ-REEL provides complete electrical and functional compatibility with identical specifications across all measured parameters. This part is the recommended first choice for direct replacement in existing designs.

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