INA819IDR Equivalent & Substitute Parts

Part Overview

The INA819IDR 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 maintains Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified when design requirements permit relaxation of specific electrical parameters or when alternative amplifier topologies satisfy application needs.

Substiute Parts

INA819IDR

Texas InstrumentsIn Stock: 1597INA819IDR Datasheet

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AD620BRZ

Analog Devices Inc.In Stock: 15246AD620BRZ Datasheet

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OP177FSZ-REEL7

Analog Devices Inc.In Stock: 16488OP177FSZ-REEL7 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the INA819IDR is determined by compatibility across the following criteria:

Package and Mounting Compatibility: All substitute parts must use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width to ensure PCB footprint compatibility.

Electrical Parameter Tolerance: Substitute parts are grouped based on amplifier topology (instrumentation versus general purpose) and allowable deviations in slew rate, bandwidth, input bias current, input offset voltage, supply current, and output current. Parts with relaxed specifications in these parameters are acceptable when application requirements do not demand the performance of the primary part.

Supply Voltage Range: Substitute parts must support the minimum 4.5 V supply requirement of the INA819IDR. Maximum supply voltage of 36 V is common across all candidates.

Temperature Operating Range: The INA819IDR operates from -40°C to 125°C. Substitute parts with reduced upper temperature limits (-40°C to 85°C) are acceptable for applications not requiring the extended high-temperature performance.

Compliance and Regulatory Status: All substitute parts maintain RoHS3 compliance and REACH Unaffected status, ensuring regulatory equivalence.

Parameter Comparison

Engineering Selection Recommendations

AD620BRZ: This instrumentation amplifier substitute maintains the same amplifier topology as the INA819IDR and is housed in the identical 8-SOIC package. The AD620BRZ exhibits higher slew rate (1.2 V/µs versus 0.9 V/µs) and slightly elevated input bias current (500 pA versus 150 pA) and input offset voltage (15 µV versus 10 µV). Supply current is increased to 900 µA. The operating temperature range is reduced to -40°C to 85°C. This part is suitable for applications where the extended temperature performance of the INA819IDR is not required and where the relaxed input bias current and offset voltage specifications are acceptable. RoHS3 compliance and improved moisture sensitivity (MSL 1) are maintained.

OP177FSZ-REEL7: This general-purpose operational amplifier represents a topology change from the instrumentation amplifier architecture of the INA819IDR. The OP177FSZ-REEL7 is packaged identically in 8-SOIC and maintains RoHS3 compliance. However, this part exhibits significantly reduced bandwidth (600 kHz gain bandwidth product versus 2 MHz), lower slew rate (0.3 V/µs versus 0.9 V/µs), and substantially higher input bias current (1.2 nA versus 150 pA). Supply current is elevated to 1.6 mA, and minimum supply voltage is increased to 6 V. This substitute is applicable only to applications where instrumentation amplifier precision is not required and where the general-purpose amplifier characteristics satisfy the design specification.

Selection between these substitutes depends on whether the application requires instrumentation amplifier performance (AD620BRZ) or can operate with general-purpose amplifier characteristics (OP177FSZ-REEL7), and whether the extended temperature range of the primary part is necessary.

Frequently Asked Questions (FAQ)

Q: Can the AD620BRZ directly replace the INA819IDR in all applications?

A: The AD620BRZ shares the instrumentation amplifier topology and 8-SOIC package with the INA819IDR, enabling direct PCB footprint compatibility. However, applications requiring operation above 85°C or demanding the lower input bias current (150 pA) and lower supply current (350 µA) of the INA819IDR must evaluate whether the AD620BRZ specifications are acceptable. Input offset voltage is 5 µV higher on the AD620BRZ.

Q: Is the OP177FSZ-REEL7 a suitable replacement for precision instrumentation applications?

A: The OP177FSZ-REEL7 is a general-purpose operational amplifier, not an instrumentation amplifier. Applications requiring the high input impedance, low input bias current, and precision characteristics of an instrumentation amplifier should not use the OP177FSZ-REEL7 as a substitute. This part is suitable only for applications where general-purpose amplifier performance is specified.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts—INA819IDR, AD620BRZ, and OP177FSZ-REEL7—use the 8-SOIC package with 0.154" (3.90mm) width, ensuring identical PCB footprint compatibility. No layout modifications are required for physical substitution.

Q: What is the impact of the reduced operating temperature range on the AD620BRZ and OP177FSZ-REEL7?

A: Both substitute parts operate from -40°C to 85°C, compared to the INA819IDR range of -40°C to 125°C. Applications requiring operation above 85°C must use the INA819IDR. Applications with maximum operating temperatures at or below 85°C are unaffected by this specification difference.

Q: How do the supply current differences affect circuit design?

A: The INA819IDR draws 350 µA, the AD620BRZ draws 900 µA, and the OP177FSZ-REEL7 draws 1.6 mA. Applications with strict power budget constraints must account for these differences. The INA819IDR provides the lowest supply current consumption.

Q: Are moisture sensitivity differences significant for storage and handling?

A: The INA819IDR has MSL 2 (1 Year), while both AD620BRZ and OP177FSZ-REEL7 have MSL 1 (Unlimited). MSL 1 parts have less stringent moisture control requirements during storage and handling. For applications with extended shelf life or challenging storage environments, the substitute parts offer improved moisture tolerance.

Q: What is the minimum supply voltage requirement for each part?

A: The INA819IDR requires minimum 4.5 V, the AD620BRZ requires minimum 4.6 V, and the OP177FSZ-REEL7 requires minimum 6 V. Applications with supply voltages between 4.5 V and 4.6 V can use only the INA819IDR. Applications with supply voltages between 4.6 V and 6 V can use the INA819IDR or AD620BRZ but not the OP177FSZ-REEL7.