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INA122U/2K5 Equivalent & Substitute Parts
Part Overview
The INA122U/2K5 is an instrumentation amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit device operates across a wide supply voltage range of 2.2 V to 36 V and maintains active product status with full RoHS3 compliance. The INA122U/2K5 is designed for precision signal conditioning applications requiring low input bias current and minimal input offset voltage. Substitute parts are identified to address packaging preferences, performance enhancements, or inventory availability while maintaining functional compatibility within specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | Instrumentation | — |
| Number of Circuits | 1 | — |
| Slew Rate | 0.16 | V/µs |
| -3dB Bandwidth | 120 | kHz |
| Current - Input Bias | 10 | nA |
| Voltage - Input Offset | 100 | µV |
| Current - Supply | 60 | µA |
| Current - Output / Channel | 30 | mA |
| Voltage - Supply Span (Min) | 2.2 | 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 (MSL) | 3 (168 Hours) | — |
Substitute Part Grouping Explanation
Substitute parts for the INA122U/2K5 are grouped based on the following substitution criteria:
Package Compatibility: The primary substitution logic distinguishes between surface mount (8-SOIC, 8-MSOP) and through-hole (8-DIP) packages. Surface mount variants maintain identical footprint compatibility with the original INA122U/2K5.
Electrical Performance Envelope: All substitute parts operate within the supply voltage range of 2.2 V to 36 V and maintain the single-circuit instrumentation amplifier topology. Substitutes are selected where input bias current, input offset voltage, slew rate, and bandwidth parameters remain within acceptable operational ranges for typical instrumentation applications.
Thermal and Environmental Specifications: All substitutes maintain the operating temperature range of -40°C to 85°C and carry RoHS3 compliance certification. Moisture sensitivity levels vary between MSL 1 (Unlimited) and MSL 3 (168 Hours), reflecting different manufacturing processes.
Packaging and Tape Format: Substitutes are available in Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR) formats to accommodate different procurement and assembly workflows.
Parameter Comparison
| Part Number | Manufacturer | Package | Mounting Type | Slew Rate (V/µs) | -3dB Bandwidth (kHz) | Input Bias (nA/pA) | Input Offset (µV) | Supply Current (µA) | Output Current (mA) | Supply Span (V) | Temp Range (°C) | MSL |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| INA122U/2K5 | Texas Instruments | 8-SOIC | Surface Mount | 0.16 | 120 | 10 nA | 100 | 60 | 30 | 2.2–36 | -40 to 85 | 3 |
| AD627ANZ | Analog Devices Inc. | 8-DIP | Through Hole | 0.06 | 80 | 2 nA | 50 | 60 | 25 | 2.2–36 | -40 to 85 | 1 |
| AD627ARZ | Analog Devices Inc. | 8-SOIC | Surface Mount | 0.06 | 80 | 2 nA | 50 | 60 | 25 | 2.2–36 | -40 to 85 | 1 |
| AD627ARZ-R7 | Analog Devices Inc. | 8-SOIC | Surface Mount | 0.06 | 80 | 2 nA | 50 | 60 | 25 | 2.2–36 | -40 to 85 | 1 |
| AD627ARZ-RL | Analog Devices Inc. | 8-SOIC | Surface Mount | 0.06 | 80 | 2 nA | 50 | 60 | 25 | 2.2–36 | -40 to 85 | 1 |
| AD627BRZ | Analog Devices Inc. | 8-SOIC | Surface Mount | 0.06 | 80 | 2 pA | 25 | 60 | 25 | 2.2–36 | -40 to 85 | 1 |
| AD627BRZ-R7 | Analog Devices Inc. | 8-SOIC | Surface Mount | 0.06 | 80 | 2 pA | 25 | 60 | 25 | 2.2–36 | -40 to 85 | 1 |
| AD627BRZ-RL | Analog Devices Inc. | 8-SOIC | Surface Mount | 0.06 | 80 | 2 pA | 25 | 60 | 25 | 2.2–36 | -40 to 85 | 1 |
| AD8220ARMZ | Analog Devices Inc. | 8-MSOP | Surface Mount | 2 | 1500 | 25 pA | 250 | 750 | 15 | 4.5–36 | -40 to 85 | 1 |
| AD8220ARMZ-R7 | Analog Devices Inc. | 8-MSOP | Surface Mount | 2 | 1500 | 25 pA | 250 | 750 | 15 | 4.5–36 | -40 to 85 | 1 |
| AD8220BRMZ | Analog Devices Inc. | 8-MSOP | Surface Mount | 2 | 1500 | 10 pA | 125 | 750 | 15 | 4.5–36 | -40 to 85 | 1 |
Engineering Selection Recommendations
Surface Mount 8-SOIC Package Substitutes (Direct Footprint Replacement):
The AD627ARZ, AD627ARZ-R7, AD627ARZ-RL, AD627BRZ, AD627BRZ-R7, and AD627BRZ-RL variants provide direct 8-SOIC package compatibility with the INA122U/2K5. These Analog Devices parts maintain identical mounting footprint and surface mount assembly compatibility. The AD627 series exhibits lower input bias current (2 nA) and reduced input offset voltage (50 µV for A-grade, 25 µV for B-grade) compared to the INA122U/2K5. All variants carry MSL 1 (Unlimited) moisture sensitivity, providing superior handling flexibility during storage and assembly. These parts are suitable for applications where improved input offset voltage performance is acceptable within the reduced bandwidth specification (80 kHz versus 120 kHz).
Through-Hole 8-DIP Package Substitute:
The AD627ANZ provides a through-hole alternative for applications requiring DIP package compatibility. This variant maintains electrical specifications identical to the AD627ARZ surface mount version but requires through-hole assembly processes. Selection of this part necessitates PCB redesign to accommodate 0.300" (7.62mm) DIP spacing.
High-Performance 8-MSOP Package Substitutes:
The AD8220ARMZ, AD8220ARMZ-R7, and AD8220BRMZ variants represent higher-performance instrumentation amplifiers in a compact 8-MSOP surface mount package. These parts deliver significantly enhanced slew rate (2 V/µs versus 0.16 V/µs) and bandwidth (1.5 MHz versus 120 kHz). The AD8220 series requires minimum supply voltage of 4.5 V, restricting use in applications operating below this threshold. Input bias current ranges from 10 pA to 25 pA, and input offset voltage ranges from 125 µV to 250 µV. Supply current increases to 750 µA. These substitutes are appropriate for high-speed signal conditioning applications where the INA122U/2K5 bandwidth is insufficient.
Compliance and Certification:
All substitute parts maintain RoHS3 compliance, REACH Unaffected status, and EAR99 export classification, matching the regulatory posture of the INA122U/2K5. Moisture sensitivity levels for AD627 variants (MSL 1) provide superior environmental tolerance compared to the INA122U/2K5 (MSL 3).
Frequently Asked Questions (FAQ)
Q: Can AD627ARZ directly replace INA122U/2K5 in existing PCB designs?
A: Yes. The AD627ARZ maintains identical 8-SOIC package dimensions (0.154" width, 3.90mm) and surface mount footprint. No PCB modification is required. Electrical performance differs in slew rate (0.06 V/µs versus 0.16 V/µs) and bandwidth (80 kHz versus 120 kHz), which must be evaluated against application requirements.
Q: What is the key difference between AD627ARZ and AD627BRZ?
A: Both parts share identical package, mounting type, and most electrical specifications. The primary distinction is input offset voltage: AD627ARZ specifies 50 µV maximum, while AD627BRZ specifies 25 µV maximum. The B-grade variant provides tighter input offset voltage tolerance for precision applications.
Q: Why do AD8220 variants require 4.5 V minimum supply voltage?
A: The AD8220 series is designed for higher-performance applications with enhanced bandwidth and slew rate. This design choice reflects the internal circuit architecture. Applications operating below 4.5 V must use AD627 or INA122U/2K5 variants, which support 2.2 V minimum supply.
Q: What packaging formats are available for the AD627ARZ?
A: The AD627ARZ is available in three packaging formats: Tube (standard), Cut Tape (CT) & Digi-Reel® (AD627ARZ-R7), and Cut Tape (CT) & Digi-Reel® (AD627ARZ-RL). All three variants share identical electrical specifications and 8-SOIC package. Format selection depends on procurement and assembly workflow requirements.
Q: Is the AD627ANZ suitable for high-volume surface mount assembly?
A: No. The AD627ANZ is a through-hole 8-DIP package designed for manual insertion or wave soldering processes. High-volume surface mount assembly requires surface mount variants such as AD627ARZ or AD627BRZ in 8-SOIC package.
Q: How does MSL rating affect component handling?
A: MSL 1 (Unlimited) components such as AD627 variants have no moisture absorption restrictions and can be stored indefinitely without baking. MSL 3 (168 Hours) components such as INA122U/2K5 must be baked before reflow if exposed to ambient humidity for more than 168 hours. MSL 1 components provide superior supply chain flexibility.
Q: Can AD8220BRMZ replace INA122U/2K5 in low-frequency applications?
A: Electrical substitution is possible, but not recommended for applications where supply voltage must remain below 4.5 V. The AD8220BRMZ minimum supply requirement of 4.5 V restricts its use in 2.2 V to 4.4 V applications. Additionally, the 1.5 MHz bandwidth and 2 V/µs slew rate exceed typical low-frequency instrumentation requirements, resulting in unnecessary power consumption (750 µA versus 60 µA).
Q: What is the inventory status of substitute parts?
A: AD627ARZ-R7 maintains the highest inventory at 40,116 pieces. AD627BRZ-RL and AD627BRZ-R7 have lower availability at 2,900 and 3,850 pieces respectively. AD627ANZ (through-hole) has 1,172 pieces in stock. AD8220 variants range from 1,233 to 15,698 pieces. Inventory levels should be verified at time of procurement.
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