INA143U Equivalent & Substitute Parts

Part Overview

The INA143U is a differential amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device functions as a single-circuit operational amplifier optimized for differential signal processing applications. The INA143U is currently designated as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications utilizing this differential amplifier topology.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Differential	—
Number of Circuits	1	—
Slew Rate	5	V/µs
-3dB Bandwidth	150	kHz
Voltage - Input Offset	100	µV
Current - Supply	950	µA
Current - Output / Channel	32	mA
Voltage - Supply Span (Min)	4.5	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution eligibility for the INA143U is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

Amplifier Type: Differential (single circuit)
Package / Case: 8-SOIC surface mount form factor
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C minimum
Supply Voltage Range: Minimum 4.5 V to maximum 36 V overlap

Substitution Logic:

The INA143U/2K5 is a direct manufacturer equivalent from Texas Instruments, differing only in packaging format (Cut Tape & Digi-Reel® versus Tube). All electrical specifications remain identical, confirming full functional interchangeability.

The AD8278 series (AD8278ARZ, AD8278ARZ-R7, AD8278BRZ, AD8278BRZ-R7) from Analog Devices Inc. qualifies as substitute parts. These devices maintain the required 8-SOIC package, surface mount configuration, and operating temperature range. The AD8278 series operates within the INA143U supply voltage envelope (2 V to 36 V minimum/maximum spans the 4.5 V to 36 V requirement). All parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements.

Parameter Comparison

Parameter	INA143U	INA143U/2K5	AD8278ARZ	AD8278ARZ-R7	AD8278BRZ	AD8278BRZ-R7
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	Differential	Differential	Differential	Differential	Differential	Differential
Number of Circuits	1	1	1	1	1	1
Output Type	—	—	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	5	5	1.4	1.4	1.4	1.4
-3dB Bandwidth (kHz)	150	150	1000	1000	1000	1000
Voltage - Input Offset (µV)	100	100	50	50	50	50
Current - Supply (µA)	950	950	200	200	200	200
Current - Output / Channel (mA)	32	32	15	15	15	15
Voltage - Supply Span (Min - Max)	4.5 - 36 V	4.5 - 36 V	2 - 36 V	2 - 36 V	2 - 36 V	2 - 36 V
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Last Time Buy	Active	Active	Active	Active	Active

Engineering Selection Recommendations

INA143U/2K5 (Texas Instruments)

The INA143U/2K5 is the manufacturer-recommended direct equivalent. This part maintains identical electrical specifications and regulatory compliance (ROHS3, REACH unaffected). The only distinction is packaging format: INA143U/2K5 is supplied in Cut Tape & Digi-Reel® format, whereas the original INA143U is supplied in Tube format. Selection of INA143U/2K5 is appropriate for applications requiring Texas Instruments sourcing continuity and identical performance characteristics. Current inventory status is 2460 pieces.

AD8278 Series (Analog Devices Inc.)

The AD8278ARZ, AD8278ARZ-R7, AD8278BRZ, and AD8278BRZ-R7 are active substitute parts from Analog Devices Inc. These devices are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the INA143U. The AD8278 series offers superior performance in specific parameters: lower input offset voltage (50 µV versus 100 µV), reduced supply current (200 µA versus 950 µA), and extended bandwidth (1 MHz versus 150 kHz). The AD8278 series also features rail-to-rail output capability and improved moisture sensitivity rating (MSL 1 Unlimited versus MSL 3 168 Hours).

Selection of AD8278 variants is appropriate for applications where enhanced performance specifications and improved reliability characteristics are beneficial. Packaging variants are available: AD8278ARZ and AD8278BRZ in Tube format; AD8278ARZ-R7 and AD8278BRZ-R7 in Cut Tape & Digi-Reel® format. Current inventory availability ranges from 2200 to 40824 pieces across variants.

Frequently Asked Questions (FAQ)

Q: Can the INA143U/2K5 be used as a direct replacement for the INA143U?

A: Yes. The INA143U/2K5 is a manufacturer-equivalent part with identical electrical specifications, operating temperature range, supply voltage range, and 8-SOIC package configuration. The difference is packaging format only (Cut Tape & Digi-Reel® versus Tube). No circuit modifications are required.

Q: What are the key differences between the INA143U and the AD8278 series?

A: The AD8278 series maintains the same 8-SOIC package and surface mount configuration, ensuring physical compatibility. Electrical differences include: AD8278 features lower input offset voltage (50 µV versus 100 µV), lower supply current consumption (200 µA versus 950 µA), higher bandwidth (1 MHz versus 150 kHz), and rail-to-rail output capability. The AD8278 series also has superior moisture sensitivity rating (MSL 1 Unlimited versus MSL 3 168 Hours). Both families operate across the required -40°C to 85°C temperature range and support 4.5 V to 36 V supply voltage operation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The INA143U/2K5 and all AD8278 variants (AD8278ARZ, AD8278ARZ-R7, AD8278BRZ, AD8278BRZ-R7) are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original INA143U.

Q: What packaging options are available for substitute parts?

A: INA143U/2K5 is supplied in Cut Tape & Digi-Reel® format. AD8278ARZ and AD8278BRZ are supplied in Tube format. AD8278ARZ-R7 and AD8278BRZ-R7 are supplied in Cut Tape & Digi-Reel® format. All variants use the same 8-SOIC (0.154", 3.90mm Width) package configuration, ensuring identical PCB footprint compatibility.

Q: Does the AD8278 series require circuit modifications when substituting for the INA143U?

A: No circuit modifications are required. The AD8278 series maintains the same pinout, package footprint, and functional differential amplifier topology. The device operates within the INA143U supply voltage range (2 V to 36 V minimum/maximum encompasses the 4.5 V to 36 V requirement) and supports the same operating temperature range (-40°C to 85°C).

Q: Which substitute part offers the best performance improvement?

A: The AD8278 series provides measurable performance enhancements: 50% reduction in input offset voltage, 79% reduction in supply current, and 6.67× increase in bandwidth. The rail-to-rail output capability and improved moisture sensitivity rating (MSL 1 Unlimited) also enhance reliability characteristics. Selection depends on application requirements and performance priorities.

Q: Are there inventory considerations when selecting substitute parts?

A: Yes. Current inventory levels vary: INA143U (3982 pieces, Last Time Buy status), INA143U/2K5 (2460 pieces, Active), AD8278ARZ (40824 pieces, Active), AD8278ARZ-R7 (2200 pieces, Active), AD8278BRZ (3700 pieces, Active), AD8278BRZ-R7 (20400 pieces, Active). The AD8278BRZ-R7 offers the highest inventory availability among active parts.

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