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INA141UA Equivalent & Substitute Parts
Part Overview
The INA141UA is a precision, low-power instrumentation amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit device is classified as Last Time Buy, indicating discontinued production status. The INA141UA delivers 1 MHz bandwidth with 4 V/µs slew rate and operates across a 4.5 V to 36 V supply range, making it suitable for precision signal conditioning applications requiring low input bias current and minimal offset voltage. Due to its Last Time Buy status, equivalent and substitute parts are necessary for ongoing design support and production continuity.
Substiute Parts
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 | — |
Substitute Part Grouping Explanation
Substitution of the INA141UA is determined by strict equivalence across the following critical parameters:
Primary Substitution Criteria:
- Amplifier Type: Instrumentation (single circuit)
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Operating Temperature Range: -40°C to 85°C
- Supply Voltage Range: Minimum 4.5 V, Maximum 36 V
- RoHS3 Compliance and REACH Unaffected status
Secondary Compatibility Parameters:
- -3dB Bandwidth: 1 MHz (exact match required)
- Current - Input Bias: 2 nA (INA141UA specification)
- Voltage - Input Offset: 20 µV (INA141UA specification)
The INA141UA from Burr Brown (now part of Texas Instruments) serves as the direct manufacturer equivalent. Analog Devices AD620 and AD621 series devices provide functional substitution with differing electrical characteristics that remain within acceptable application ranges for most instrumentation amplifier circuits. All substitute parts maintain identical package geometry, surface mount compatibility, and environmental operating specifications.
Parameter Comparison
| Parameter | INA141UA (TI) | INA141UA (Burr Brown) | AD620ARZ | AD620BRZ | AD621ARZ |
|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Burr Brown | Analog Devices | Analog Devices | Analog Devices |
| Amplifier Type | Instrumentation | Instrumentation | Instrumentation | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 |
| Slew Rate (V/µs) | 4 | 4 | 1.2 | 1.2 | 1.2 |
| -3dB Bandwidth (MHz) | 1 | 1 | 1 | 1 | 0.8 |
| Current - Input Bias (pA) | 2000 | 2000 | 500 | 500 | 500 |
| Voltage - Input Offset (µV) | 20 | 20 | 30 | 15 | 75 |
| Current - Supply (µA) | 750 | 750 | 900 | 900 | 900 |
| Current - Output / Channel (mA) | 15 | 15 | 18 | 18 | 18 |
| Voltage - Supply Span (Min, V) | 4.5 | 4.5 | 4.6 | 4.6 | 4.6 |
| Voltage - Supply Span (Max, V) | 36 | 36 | 36 | 36 | 36 |
| Operating Temperature (°C) | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
| Product Status | Last Time Buy | Active | Active | Active | Active |
Engineering Selection Recommendations
Direct Equivalent (Recommended Primary Substitute):
The INA141UA manufactured by Burr Brown maintains identical electrical specifications and packaging to the Texas Instruments INA141UA. This part is Active status and provides seamless substitution for Last Time Buy inventory management. Both devices share identical slew rate (4 V/µs), bandwidth (1 MHz), input bias current (2 nA), and input offset voltage (20 µV) specifications.
Functional Substitutes (Secondary Options):
The Analog Devices AD620 series (AD620ARZ, AD620BRZ, AD620BRZ-R7) and AD621 series (AD621ARZ, AD621ARZ-R7, AD621ARZ-RL) provide functional instrumentation amplifier substitution with the following trade-offs:
-
AD620 variants deliver reduced slew rate (1.2 V/µs versus 4 V/µs) and higher input bias current (500 pA versus 2 nA). The AD620BRZ variant offers superior input offset voltage (15 µV) compared to the INA141UA (20 µV).
-
AD621 variants maintain 1 MHz bandwidth but exhibit reduced slew rate (1.2 V/µs), higher input bias current (500 pA), and degraded input offset voltage (75 µV).
All substitute parts maintain Active product status, ROHS3 compliance, REACH Unaffected designation, and identical 8-SOIC surface mount packaging. Supply voltage ranges (4.6 V to 36 V minimum/maximum) and operating temperature specifications (-40°C to 85°C) remain compatible with the original INA141UA design envelope.
Frequently Asked Questions (FAQ)
Q: Can I directly replace INA141UA with AD620ARZ in my circuit?
A: Direct replacement is mechanically and electrically feasible due to identical 8-SOIC packaging and compatible supply voltage ranges. However, the AD620ARZ exhibits lower slew rate (1.2 V/µs versus 4 V/µs) and higher input bias current (500 pA versus 2 nA). Circuit performance in high-speed or ultra-low-bias-current applications may be affected. Verify application requirements before substitution.
Q: What is the difference between AD620ARZ, AD620ARZ-REEL, and AD620ARZ-REEL7?
A: These part numbers represent identical electrical devices with different packaging formats. AD620ARZ ships in Tube packaging. AD620ARZ-REEL and AD620ARZ-REEL7 are supplied on Cut Tape (CT) & Digi-Reel® format for automated assembly. Electrical specifications and 8-SOIC package dimensions are identical across all three variants.
Q: Is the Burr Brown INA141UA truly equivalent to the Texas Instruments INA141UA?
A: Yes. The Burr Brown INA141UA is the direct manufacturer equivalent with identical part number, electrical specifications, and 8-SOIC packaging. Burr Brown is now part of Texas Instruments. This part is Active status and recommended as the primary substitute for Last Time Buy inventory.
Q: Why does AD621ARZ have lower bandwidth (800 kHz) than INA141UA (1 MHz)?
A: The AD621 is a distinct product variant within the Analog Devices instrumentation amplifier family, designed with different frequency response characteristics. The 800 kHz bandwidth specification is a fundamental design parameter of the AD621 series and is not interchangeable with the 1 MHz INA141UA specification.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts (INA141UA Burr Brown, AD620 series, and AD621 series) are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.
Q: What packaging options are available for AD620 and AD621 devices?
A: Analog Devices AD620 and AD621 instrumentation amplifiers are available in multiple packaging formats: Tube (standard), Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR). All variants maintain identical 8-SOIC (0.154", 3.90mm Width) case geometry and surface mount compatibility. Selection depends on assembly process requirements and inventory management preferences.
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