INA155U/2K5G4 Equivalent & Substitute Parts

Part Overview

The INA155U/2K5G4 is an instrumentation amplifier manufactured by Texas Instruments, designed for precision signal conditioning applications requiring rail-to-rail output capability. This single-circuit device operates across a 2.7V to 5.5V supply range and is housed in an 8-SOIC surface mount package.

The INA155U/2K5G4 is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this instrumentation amplifier topology.

Substiute Parts

INA155U/2K5G4

Texas InstrumentsIn Stock: 1023INA155U/2K5G4 Datasheet

Current PartRFQ

INA155U/2K5

Texas InstrumentsIn Stock: 3649INA155U/2K5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the INA155U/2K5G4 is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Amplifier type (Instrumentation)
• Number of circuits (1)
• Output type (Rail-to-Rail)
• Slew rate (6.5 V/µs)
• Bandwidth (-3dB: 550 kHz)
• Input bias current (1 pA)
• Input offset voltage (200 µV)
• Supply current (1.7 mA)
• Output current per channel (50 mA)
• Supply voltage range (2.7V to 5.5V)
• Operating temperature range (-55°C to 125°C)

Physical & Environmental Specifications:

• Package type (8-SOIC)
• Mounting type (Surface Mount)
• RoHS compliance (ROHS3)
• Moisture sensitivity level (MSL 2)

Substitute parts must match all electrical and physical parameters without deviation. Packaging format differences (Tape & Reel versus other formats) do not affect functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The INA155U/2K5 is a direct functional equivalent to the INA155U/2K5G4. Both parts are manufactured by Texas Instruments and share identical electrical specifications, operating parameters, and physical package dimensions.

The primary distinction between these parts is product status and packaging format. The INA155U/2K5G4 is discontinued at DiGi Electronics, whereas the INA155U/2K5 maintains active product status with current inventory availability (3620 units in stock). The INA155U/2K5 is supplied in Tape & Reel format, while the INA155U/2K5G4 was supplied in tube packaging.

Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings. Selection of the INA155U/2K5 as a substitute ensures continued access to an active, functionally equivalent instrumentation amplifier without modification to circuit design or PCB layout.

Frequently Asked Questions (FAQ)

Q: Can the INA155U/2K5 be used as a direct replacement for the INA155U/2K5G4?

A: Yes. The INA155U/2K5 is functionally equivalent to the INA155U/2K5G4. All electrical specifications, operating parameters, package dimensions, and environmental ratings are identical. The parts differ only in product status (active versus discontinued) and packaging format (Tape & Reel versus tube).

Q: What is the difference between the packaging formats?

A: The INA155U/2K5G4 was supplied in tube packaging, while the INA155U/2K5 is supplied in Tape & Reel (TR) format. Both formats contain the same component in the same 8-SOIC package. Tape & Reel format is standard for automated assembly processes and does not affect component performance or compatibility.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts have identical electrical specifications: 6.5 V/µs slew rate, 550 kHz bandwidth, 1 pA input bias current, 200 µV input offset voltage, 1.7 mA supply current, and 50 mA output current per channel. Supply voltage range (2.7V to 5.5V) and operating temperature range (-55°C to 125°C) are also identical.

Q: Will the INA155U/2K5 require any PCB layout modifications?

A: No. Both parts use the identical 8-SOIC package with 0.154" width and 3.90mm dimensions. Pin configuration and footprint are identical, requiring no PCB layout changes.

Q: Are both parts RoHS compliant?

A: Yes. Both the INA155U/2K5G4 and INA155U/2K5 are ROHS3 compliant with MSL 2 (1 Year) moisture sensitivity rating.

Q: Why is the INA155U/2K5G4 discontinued?

A: Product discontinuation decisions are made by manufacturers and distributors based on market demand and supply chain optimization. The INA155U/2K5 remains in active production and provides equivalent functionality for all applications previously served by the INA155U/2K5G4.