INA141U/2K5 Equivalent & Substitute Parts

Part Overview

The INA141U/2K5 is an instrumentation amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit device is designed for precision signal conditioning applications requiring low input offset voltage and low input bias current. The part is currently in active production status with 2800 units in stock.

Substitute parts are necessary when the INA141U/2K5 becomes unavailable due to supply constraints, end-of-life notifications, or when design requirements permit alternative amplifier topologies that meet or exceed the electrical specifications of the original component.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Instrumentation	—
Number of Circuits	1	—
Slew Rate	4	V/µs
-3dB Bandwidth	1	MHz
Current - Input Bias	2	nA
Voltage - Input Offset	20	µV
Current - Supply	750	µA
Current - Output / Channel	15	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 logic for the INA141U/2K5 is based on the following criteria:

Primary Substitution Group (Instrumentation Amplifiers): LT1167ACS8-1#PBF, LT1167AIS8-1#PBF, and LT1167CS8-1#PBF are instrumentation amplifiers with identical amplifier topology to the main part. These substitutes maintain the same functional class and are evaluated based on:

Amplifier Type: Instrumentation
Package compatibility: 8-SOIC form factor
Supply voltage range overlap: 4.6V to 36V (compatible with 4.5V to 36V)
Operating temperature range: -40°C to 85°C (LT1167AIS8-1#PBF) or 0°C to 70°C (LT1167ACS8-1#PBF and LT1167CS8-1#PBF)
Input bias current: 50 pA to 80 pA (lower than 2 nA main part)
Input offset voltage: 15 µV to 20 µV (comparable to 20 µV main part)

Secondary Substitution Group (General Purpose Amplifiers): AD797ARZ and ADA4004-1ARZ are general purpose operational amplifiers. These represent functional alternatives when instrumentation amplifier topology is not mandatory. Evaluation criteria include:

Package compatibility: 8-SOIC form factor
Supply voltage range: 10V to 30V (AD797ARZ) or 10V to 36V (ADA4004-1ARZ)
Operating temperature range: -40°C to 85°C (AD797ARZ) or -40°C to 125°C (ADA4004-1ARZ)
Output current capability: 50 mA (AD797ARZ) or 10 mA (ADA4004-1ARZ)

Parameter Comparison

Parameter	INA141U/2K5	LT1167ACS8-1#PBF	LT1167AIS8-1#PBF	LT1167CS8-1#PBF	AD797ARZ	ADA4004-1ARZ
Amplifier Type	Instrumentation	Instrumentation	Instrumentation	Instrumentation	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1
Slew Rate (V/µs)	4	1.2	1.2	1.2	20	2.7
-3dB Bandwidth (MHz)	1	1	1	1	8	—
Current - Input Bias (nA)	2	0.05	0.05	0.08	0.25	0.04
Voltage - Input Offset (µV)	20	15	15	20	25	40
Current - Supply (µA)	750	900	900	900	8200	2200
Current - Output / Channel (mA)	15	—	—	—	50	10
Voltage - Supply Span Min (V)	4.5	4.6	4.6	4.6	10	10
Voltage - Supply Span Max (V)	36	36	36	36	30	36
Operating Temperature (°C)	-40 to 85	0 to 70	-40 to 85	0 to 70	-40 to 85	-40 to 125
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Instrumentation Amplifier Replacement:

The LT1167 series (LT1167AIS8-1#PBF, LT1167ACS8-1#PBF, LT1167CS8-1#PBF) maintains instrumentation amplifier topology identical to the INA141U/2K5. All three variants are ROHS3 compliant and REACH unaffected. Selection among these three is determined by operating temperature requirements:

LT1167AIS8-1#PBF: Supports full -40°C to 85°C temperature range, matching the main part specification. Recommended for applications requiring extended low-temperature operation.
LT1167ACS8-1#PBF and LT1167CS8-1#PBF: Limited to 0°C to 70°C operating range. Suitable for controlled environment applications only.

All LT1167 variants feature improved moisture sensitivity (MSL 1, Unlimited) compared to the INA141U/2K5 (MSL 3, 168 Hours), reducing handling and storage constraints.

For General Purpose Amplifier Substitution:

AD797ARZ and ADA4004-1ARZ represent functional alternatives when instrumentation amplifier gain configuration is not required. Both are ROHS3 compliant and REACH unaffected.

AD797ARZ: Provides higher slew rate (20 V/µs) and bandwidth (8 MHz) with greater output current capability (50 mA). Suitable for high-speed signal conditioning. Minimum supply voltage requirement of 10V may limit use in low-voltage applications.
ADA4004-1ARZ: Offers extended operating temperature range (-40°C to 125°C) and lower supply current (2.2 mA). Suitable for temperature-critical or power-constrained applications. Output current limited to 10 mA.

Compliance Status:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original component.

Frequently Asked Questions (FAQ)

Q: Can LT1167ACS8-1#PBF or LT1167CS8-1#PBF be used in applications requiring -40°C operation?

A: No. These variants are rated for 0°C to 70°C operating temperature only. The LT1167AIS8-1#PBF variant supports -40°C to 85°C and is the appropriate choice for extended low-temperature applications.

Q: What is the primary difference between the three LT1167 variants?

A: The variants differ in operating temperature range and input bias current specification. LT1167AIS8-1#PBF supports -40°C to 85°C with 50 pA input bias current. LT1167ACS8-1#PBF supports 0°C to 70°C with 50 pA input bias current. LT1167CS8-1#PBF supports 0°C to 70°C with 80 pA input bias current.

Q: Are AD797ARZ and ADA4004-1ARZ direct functional replacements for the INA141U/2K5?

A: These are general purpose operational amplifiers, not instrumentation amplifiers. They can substitute the INA141U/2K5 only in applications where instrumentation amplifier topology is not mandatory. Circuit redesign may be required to achieve equivalent gain and common-mode rejection performance.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: The INA141U/2K5 has MSL 3 (168 Hours), requiring controlled storage and handling within 168 hours of moisture exposure. All substitute parts have MSL 1 (Unlimited), eliminating moisture sensitivity constraints and reducing handling complexity.

Q: Can AD797ARZ be used in applications with supply voltages below 10V?

A: No. AD797ARZ requires minimum 10V supply voltage. The INA141U/2K5 and LT1167 series support operation at 4.5V to 4.6V minimum, making them suitable for lower-voltage applications.

Q: Which substitute part offers the best low-power performance?

A: ADA4004-1ARZ draws 2.2 mA supply current, compared to 750 µA for the INA141U/2K5 and 900 µA for LT1167 variants. For lowest power consumption, the INA141U/2K5 or LT1167 series are preferred. ADA4004-1ARZ is suitable when extended temperature range (-40°C to 125°C) justifies higher current draw.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All substitute parts are housed in 8-SOIC (0.154", 3.90mm Width) surface mount packages, ensuring PCB layout compatibility with the INA141U/2K5.

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