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INA128U/2K5 Equivalent & Substitute Parts
Part Overview
The INA128U/2K5 is a single-channel instrumentation amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as Active product status and is designed for precision signal conditioning applications requiring low input offset voltage and low input bias current. The INA128U/2K5 operates across a wide supply voltage range of 4.5V to 36V with an operating temperature range of -40°C to 85°C. Substitute parts are identified when equivalent functional performance can be achieved within the constraints of the application's electrical specifications and physical form factor requirements.
Substiute Parts
Key Parameters
| Parameter | INA128U/2K5 | Unit |
|---|---|---|
| Amplifier Type | Instrumentation | — |
| Number of Circuits | 1 | — |
| Slew Rate | 4 | V/µs |
| -3dB Bandwidth | 1.3 | MHz |
| Current - Input Bias | 2 | nA |
| Voltage - Input Offset | 10 | µV |
| Current - Supply | 700 | 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 |
| Mounting Type | Surface Mount | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 3 (168 Hours) | — |
Substitute Part Grouping Explanation
Substitution of the INA128U/2K5 is determined by the following critical parameters:
Functional Equivalence Criteria:
- Amplifier Type: Must be Instrumentation
- Number of Circuits: Must be 1
- Supply Voltage Range: Substitute must accommodate the 4.5V minimum and 36V maximum operating range
- Input Bias Current: Lower values indicate superior performance; substitutes with 2 nA to 50 nA are functionally equivalent
- Input Offset Voltage: Lower values indicate superior performance; substitutes with 10 µV to 250 µV are functionally equivalent
- Slew Rate: Minimum 4 V/µs required for equivalent dynamic response
- Bandwidth: Minimum 1 MHz required for equivalent frequency response
Packaging Considerations:
- Surface mount packages (8-SOIC, 16-SOIC, 20-CLCC) are direct mechanical substitutes
- Through-hole packages (14-CDIP, 16-CDIP) require PCB redesign and are not pin-compatible
- Tape & Reel packaging is functionally identical to Cut Tape for component selection
Compliance Requirements:
- All substitutes must maintain ROHS3 compliance
- Product Status of Active is preferred; Not For New Designs parts are acceptable for legacy applications only
Parameter Comparison
| Parameter | INA128U/2K5 | 5962-87719012A | AD521KDZ | AD521LDZ | AD521SD/883B | AD524ADZ | AD524ARZ-16 | AD524ARZ-16-REEL7 | AD524BDZ | AD524BE | AD620ANZ | Unit |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Amplifier Type | Instrumentation | Instrumentation | Instrumentation | Instrumentation | Instrumentation | Instrumentation | Instrumentation | Instrumentation | Instrumentation | Instrumentation | Instrumentation | — |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | — |
| Slew Rate | 4 | 5 | 10 | 10 | 10 | 5 | 5 | 5 | 5 | 5 | 1.2 | V/µs |
| -3dB Bandwidth | 1.3 | — | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | MHz |
| Current - Input Bias | 2 | 50 | 40 | 40 | 80 | 50 | 50 | 50 | 25 | 25 | 500 | nA / pA |
| Voltage - Input Offset | 10 | 200 | 1500 | 1000 | 3000 | 250 | 250 | 250 | 100 | 100 | 30 | µV |
| Current - Supply | 700 | 5000 | 5000 | 5000 | 5000 | 3500 | 3500 | 3500 | 3500 | 3500 | 900 | µA |
| Voltage - Supply Span (Min) | 4.5 | 36 | 10 | 10 | 10 | 12 | 12 | 12 | 12 | 12 | 4.6 | V |
| Voltage - Supply Span (Max) | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | V |
| Operating Temperature | -40 to 85 | -55 to 125 | 0 to 70 | 0 to 70 | -55 to 125 | -25 to 85 | -25 to 85 | -25 to 85 | -25 to 85 | -25 to 85 | -40 to 85 | °C |
| Mounting Type | Surface Mount | Surface Mount | Through Hole | Through Hole | Through Hole | Through Hole | Surface Mount | Surface Mount | Through Hole | Surface Mount | Through Hole | — |
| Package / Case | 8-SOIC | 20-CLCC | 14-CDIP | 14-CDIP | 14-CDIP | 16-CDIP | 16-SOIC | 16-SOIC | 16-CDIP | 20-CLCC | 8-DIP | — |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | — |
Engineering Selection Recommendations
Surface Mount Direct Substitutes (No PCB Redesign Required):
AD524ARZ-16 and AD524ARZ-16-REEL7 are surface mount instrumentation amplifiers in 16-SOIC packaging. These parts maintain surface mount form factor compatibility with the INA128U/2K5, though they require different pinout accommodation due to 16-pin versus 8-pin configuration. Both parts are Active status and ROHS3 compliant. The AD524ARZ-16-REEL7 offers higher inventory availability (5250 Pcs) in Tape & Reel packaging suitable for automated assembly.
AD524BE is a surface mount instrumentation amplifier in 20-CLCC packaging. This part is Active status and ROHS3 compliant, offering superior input offset voltage performance (100 µV) compared to the INA128U/2K5 (10 µV). The 20-CLCC package requires PCB footprint modification.
Through-Hole Alternatives (PCB Redesign Required):
AD521KDZ and AD521LDZ are 14-CDIP through-hole instrumentation amplifiers. Both are Active status and ROHS3 compliant with identical electrical specifications. AD521LDZ offers marginally superior input offset voltage (1 mV versus 1.5 mV). These parts require complete PCB redesign due to through-hole mounting and different pin count.
AD524ADZ and AD524BDZ are 16-CDIP through-hole instrumentation amplifiers. AD524BDZ provides superior input offset voltage (100 µV) and lower input bias current (25 nA) compared to AD524ADZ (250 µV, 50 nA). Both are Active status and ROHS3 compliant.
Legacy Applications:
AD521SD/883B is classified as Not For New Designs and should not be selected for new product development. This part is retained in inventory for legacy system support only.
5962-87719012A is a military-grade instrumentation amplifier in 20-CLCC packaging with extended operating temperature range (-55°C to 125°C). This part is suitable only for applications requiring military-specification compliance.
Lowest Power Consumption Alternative:
AD620ANZ is a through-hole 8-DIP instrumentation amplifier with the lowest supply current (900 µA) among all substitutes, compared to INA128U/2K5 (700 µA). This part is Active status and ROHS3 compliant with operating temperature range matching the INA128U/2K5 (-40°C to 85°C). However, the slew rate is significantly lower (1.2 V/µs versus 4 V/µs), making it unsuitable for high-speed applications.
Frequently Asked Questions (FAQ)
Q: Can I use AD524ARZ-16 as a direct pin-for-pin replacement for INA128U/2K5?
A: No. The INA128U/2K5 is an 8-pin SOIC package, while AD524ARZ-16 is a 16-pin SOIC package. Although both are surface mount, the pinout is completely different and requires PCB redesign. The AD524ARZ-16 cannot be substituted without modifying the circuit board layout and schematic connections.
Q: What is the key difference between AD524ARZ-16 and AD524ARZ-16-REEL7?
A: Both parts are electrically and functionally identical. The difference is packaging format: AD524ARZ-16 is supplied in Tube packaging, while AD524ARZ-16-REEL7 is supplied in Tape & Reel (TR) format. The Tape & Reel version is optimized for high-volume automated assembly and offers significantly higher inventory availability (5250 Pcs versus 1898 Pcs).
Q: Why does AD620ANZ have lower slew rate than INA128U/2K5?
A: The AD620ANZ is designed for low-power applications with slew rate of 1.2 V/µs, while the INA128U/2K5 provides 4 V/µs. This difference reflects different design optimization priorities. AD620ANZ prioritizes power consumption reduction, while INA128U/2K5 prioritizes dynamic response speed. Selection depends on application requirements for signal bandwidth and power budget.
Q: Can I substitute INA128U/2K5 with a through-hole part like AD521LDZ?
A: Electrically, yes. AD521LDZ is functionally equivalent with superior input offset voltage (1 mV versus 10 µV). However, this requires complete PCB redesign because AD521LDZ is a 14-pin through-hole DIP package, while INA128U/2K5 is an 8-pin surface mount SOIC. The mounting technology, pin count, and physical footprint are incompatible without circuit board modification.
Q: What does "Not For New Designs" mean for AD521SD/883B?
A: This designation indicates the part is obsolete for new product development. Analog Devices continues to manufacture and support AD521SD/883B for existing legacy systems only. New designs should select from Active status parts such as AD521KDZ, AD521LDZ, or other alternatives listed in this reference.
Q: Is 5962-87719012A suitable for commercial applications?
A: No. The 5962-87719012A is a military-specification instrumentation amplifier (indicated by the 5962 prefix) designed for defense and aerospace applications requiring MIL-STD compliance. This part is not recommended for commercial applications. For commercial use, select from the Analog Devices AD524 or AD521 series parts with standard industrial specifications.
Q: How do I choose between AD524ADZ and AD524BDZ?
A: Both are 16-CDIP through-hole instrumentation amplifiers with identical slew rate (5 V/µs) and bandwidth (1 MHz). The key difference is performance grade: AD524BDZ offers superior specifications with input offset voltage of 100 µV and input bias current of 25 nA, compared to AD524ADZ with 250 µV and 50 nA respectively. Select AD524BDZ for precision applications requiring lower offset voltage; select AD524ADZ for cost-sensitive applications where the higher offset voltage is acceptable.
Q: What is the significance of Moisture Sensitivity Level (MSL)?
A: MSL indicates the maximum time a component can be exposed to ambient humidity before soldering. INA128U/2K5 has MSL 3 (168 hours), meaning it must be soldered within 168 hours of package opening. Most substitute parts have MSL 1 (Unlimited), indicating superior moisture resistance and longer shelf life after opening. Lower MSL values reduce risk of moisture-induced soldering defects.
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