INA143U/2K5 Equivalent & Substitute Parts

Part Overview

The INA143U/2K5 is a differential amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit operational amplifier is designed for precision differential signal conditioning applications requiring low input offset voltage and moderate bandwidth performance. The device operates across a wide supply voltage range of 4.5V to 36V and maintains active product status with full RoHS3 compliance. Substitute parts are identified to address specific application requirements including alternative package formats, enhanced performance characteristics, or improved supply chain availability while maintaining functional compatibility within defined electrical parameters.

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

Substitute parts for the INA143U/2K5 are organized into two functional categories based on amplifier type and output configuration:

Category 1: Differential Amplifiers with Rail-to-Rail Output (AD8276 Series) These substitutes maintain the differential amplifier topology of the original part while offering rail-to-rail output capability. The AD8276 series includes AD8276ARMZ, AD8276ARMZ-R7, AD8276ARMZ-RL, AD8276ARZ-R7, AD8276BRMZ, AD8276BRMZ-R7, and AD8276BRZ. These parts share identical input offset voltage (100 µV), operating temperature range (-40°C to 85°C), and supply voltage span (2V to 36V). Key differentiators include package format (8-MSOP or 8-SOIC), packaging type (Tube or Cut Tape), and inventory availability. The lower supply voltage minimum (2V vs. 4.5V) and reduced supply current (200µA vs. 950µA) provide enhanced flexibility for low-power applications.

Category 2: Programmable Gain Amplifiers with Single-Ended Output (AD8274 Series) These substitutes transition from differential to programmable gain amplifier topology with single-ended output. The AD8274 series includes AD8274ARMZ, AD8274ARMZ-R7, and AD8274ARZ-R7. These parts maintain the same input offset voltage specification (300 µV), operating temperature range, and supply voltage span (5V to 36V). Enhanced performance includes higher slew rate (20V/µs vs. 5V/µs) and significantly higher gain bandwidth product (20 MHz vs. 150 kHz). Package options include 8-MSOP and 8-SOIC formats with corresponding packaging variations.

Substitution eligibility is determined by: (1) matching supply voltage compatibility within the specified range, (2) acceptable input offset voltage tolerance for the application, (3) compatible package footprint or deliberate package transition, and (4) output type requirements (differential vs. single-ended, standard vs. rail-to-rail).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Output Type	Slew Rate (V/µs)	Input Offset (µV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Package	Temp Range (°C)
INA143U/2K5	Texas Instruments	Differential	—	5	100	0.95	32	4.5	36	8-SOIC	-40 to 85
AD8274ARMZ	Analog Devices	Programmable Gain	Single-Ended	20	300	2.3	90	5	36	8-MSOP	-40 to 85
AD8274ARMZ-R7	Analog Devices	Programmable Gain	Single-Ended	20	300	2.3	90	5	36	8-MSOP	-40 to 85
AD8274ARZ-R7	Analog Devices	Programmable Gain	Single-Ended	20	300	2.3	90	5	36	8-SOIC	-40 to 85
AD8276ARMZ	Analog Devices	Differential	Rail-to-Rail	1.1	100	0.2	15	2	36	8-MSOP	-40 to 85
AD8276ARMZ-R7	Analog Devices	Differential	Rail-to-Rail	1.1	100	0.2	15	2	36	8-MSOP	-40 to 85
AD8276ARMZ-RL	Analog Devices	Differential	Rail-to-Rail	1.1	100	0.2	15	2	36	8-MSOP	-40 to 85
AD8276ARZ-R7	Analog Devices	Differential	Rail-to-Rail	1.1	100	0.2	15	2	36	8-SOIC	-40 to 85
AD8276BRMZ	Analog Devices	Differential	Rail-to-Rail	1.1	100	0.2	15	2	36	8-MSOP	-40 to 85
AD8276BRMZ-R7	Analog Devices	Differential	Rail-to-Rail	1.1	100	0.2	15	2	36	8-MSOP	-40 to 85
AD8276BRZ	Analog Devices	Differential	Rail-to-Rail	1.1	100	0.2	15	2	36	8-SOIC	-40 to 85

Engineering Selection Recommendations

For Direct Package-Compatible Substitution (8-SOIC Format)

The AD8276 series differential amplifiers in 8-SOIC package format (AD8276ARZ-R7, AD8276BRZ) provide direct footprint compatibility with the INA143U/2K5. These parts maintain identical input offset voltage (100 µV) and operating temperature range (-40°C to 85°C). The AD8276 series operates across a lower minimum supply voltage (2V vs. 4.5V) and draws significantly reduced supply current (200µA vs. 950µA), making them suitable for power-constrained applications. Both parts carry RoHS3 compliance and REACH unaffected status. The AD8276BRZ offers the highest inventory availability (100,100 units) in tube packaging, while AD8276ARZ-R7 provides 4,571 units in Cut Tape format.

For Alternative Package Formats with Enhanced Performance

The AD8276 series in 8-MSOP package format (AD8276ARMZ-RL, AD8276BRMZ-R7) delivers the same electrical characteristics as the 8-SOIC variants with reduced package footprint (0.118" vs. 0.154" width). The AD8276ARMZ-RL variant provides the highest inventory level (36,100 units) among MSOP options in Cut Tape packaging. These substitutes are appropriate when PCB space optimization is required without compromising electrical performance.

For Enhanced Bandwidth and Slew Rate Applications

The AD8274 series programmable gain amplifiers (AD8274ARMZ-R7, AD8274ARZ-R7) offer significantly enhanced performance with 20V/µs slew rate and 20 MHz gain bandwidth product compared to the original 5V/µs and 150 kHz specifications. These parts transition from differential to single-ended output topology and require minimum 5V supply (vs. 4.5V). Input offset voltage increases to 300 µV. The AD8274ARMZ-R7 in 8-MSOP format provides the highest inventory (18,680 units) among this series. Selection of AD8274 variants is appropriate for applications requiring higher frequency response and faster signal conditioning.

All substitute parts maintain active product status and full RoHS3 compliance with REACH unaffected designation, ensuring regulatory compatibility with the original component.

Frequently Asked Questions (FAQ)

Q: Can AD8276 series parts directly replace the INA143U/2K5 without circuit modification?

A: AD8276 series differential amplifiers in 8-SOIC package (AD8276ARZ-R7, AD8276BRZ) provide direct footprint compatibility. However, circuit validation is required to confirm compatibility with application-specific biasing, feedback networks, and output loading conditions. The lower supply current (200µA vs. 950µA) and extended lower supply voltage limit (2V vs. 4.5V) may require power supply design review.

Q: What is the functional difference between AD8276 and AD8274 series substitutes?

A: The AD8276 series maintains differential amplifier topology with rail-to-rail output capability, matching the original INA143U/2K5 functional architecture. The AD8274 series transitions to programmable gain amplifier topology with single-ended output, offering enhanced bandwidth (20 MHz vs. 150 kHz) and slew rate (20V/µs vs. 5V/µs). Selection depends on whether the application requires differential or single-ended output configuration.

Q: Are there package format options available for the substitute parts?

A: Yes. AD8276 and AD8274 series are available in both 8-SOIC (0.154" width) and 8-MSOP (0.118" width) packages. The 8-SOIC format provides direct footprint compatibility with INA143U/2K5. The 8-MSOP format offers reduced package size for space-constrained designs. Packaging type options include Tube and Cut Tape (CT) & Digi-Reel formats.

Q: What are the supply voltage compatibility considerations for substitution?

A: The INA143U/2K5 operates from 4.5V to 36V. AD8276 series substitutes operate from 2V to 36V, providing extended lower voltage capability. AD8274 series substitutes operate from 5V to 36V, requiring minimum 5V supply. Applications using supply voltages between 2V and 4.5V can only use AD8276 variants. Applications using 4.5V to 5V can use INA143U/2K5 or AD8276 variants but not AD8274 variants.

Q: How do input offset voltage specifications affect substitution decisions?

A: The INA143U/2K5 and AD8276 series share identical 100 µV input offset voltage specification. The AD8274 series specifies 300 µV input offset voltage. For precision applications requiring offset voltage below 300 µV, AD8276 variants are appropriate. For applications with higher offset voltage tolerance, AD8274 variants are acceptable.

Q: What inventory and packaging considerations should guide part selection?

A: AD8276BRZ (8-SOIC, Tube) offers the highest inventory (100,100 units) for immediate availability. AD8276ARMZ-RL (8-MSOP, Cut Tape) provides 36,100 units with reel packaging for automated assembly. AD8274ARMZ-R7 (8-MSOP, Cut Tape) provides 18,680 units with enhanced performance characteristics. Selection should balance availability requirements with packaging format and performance specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (AD8276 and AD8274 series) carry RoHS3 compliance and REACH unaffected status, matching the regulatory compliance of the original INA143U/2K5 component.

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