INA155UG4 Equivalent & Substitute Parts

Part Overview

The INA155UG4 is a single-channel instrumentation amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device provides rail-to-rail output capability with a slew rate of 6.5V/µs and operates across a supply voltage range of 2.7V to 5.5V. The INA155UG4 is currently discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical performance characteristics and package specifications to ensure direct compatibility in existing circuit designs.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Instrumentation	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	6.5	V/µs
-3dB Bandwidth	550	kHz
Current - Input Bias	1	pA
Voltage - Input Offset	200	µV
Current - Supply	1.7	mA
Current - Output / Channel	50	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature Range	-55 to 125	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	2 (1 Year)	—

Substitute Part Grouping Explanation

Substitute parts for the INA155UG4 are identified based on strict equivalence of electrical and mechanical parameters. The substitution criteria are defined by the following key parameters:

Amplifier Type: Instrumentation amplifier architecture
Number of Circuits: Single-channel configuration
Output Type: Rail-to-rail output capability
Slew Rate: 6.5V/µs minimum
-3dB Bandwidth: 550 kHz minimum
Input Bias Current: 1 pA maximum
Input Offset Voltage: 200 µV maximum
Supply Current: 1.7 mA maximum
Output Current: 50 mA per channel minimum
Supply Voltage Range: 2.7V to 5.5V
Operating Temperature: -55°C to 125°C
Package: 8-SOIC surface mount
Compliance: ROHS3 compliant, MSL 2

Parts meeting all these criteria are classified as direct substitutes. The INA155U meets all specified parameters and is available in active product status.

Parameter Comparison

Parameter	INA155UG4 (Main Part)	INA155U (Substitute)	Match
Manufacturer	Texas Instruments	Texas Instruments	✓
Amplifier Type	Instrumentation	Instrumentation	✓
Number of Circuits	1	1	✓
Output Type	Rail-to-Rail	Rail-to-Rail	✓
Slew Rate	6.5 V/µs	6.5 V/µs	✓
-3dB Bandwidth	550 kHz	550 kHz	✓
Current - Input Bias	1 pA	1 pA	✓
Voltage - Input Offset	200 µV	200 µV	✓
Current - Supply	1.7 mA	1.7 mA	✓
Current - Output / Channel	50 mA	50 mA	✓
Voltage - Supply Span (Min)	2.7 V	2.7 V	✓
Voltage - Supply Span (Max)	5.5 V	5.5 V	✓
Operating Temperature	-55°C to 125°C	-55°C to 125°C	✓
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	✓
Mounting Type	Surface Mount	Surface Mount	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level	2 (1 Year)	2 (1 Year)	✓
Product Status	Discontinued at DiGi Electronics	Active	✓

Engineering Selection Recommendations

The INA155U is a direct functional and mechanical equivalent to the INA155UG4. Both parts are manufactured by Texas Instruments and share identical electrical specifications across all measured parameters. The primary distinction is product status: the INA155UG4 is discontinued, while the INA155U maintains active product status with confirmed inventory availability.

Selection of the INA155U as a substitute is supported by:

Complete electrical parameter equivalence
Identical package and pinout configuration
Matching compliance certifications (ROHS3, MSL 2)
Active manufacturing and supply chain availability
Same base product number (INA155) indicating common design lineage

The INA155U is suitable for direct replacement in applications currently specified for the INA155UG4 without circuit modification or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can the INA155U be used as a direct replacement for the INA155UG4?

A: Yes. The INA155U is electrically and mechanically equivalent to the INA155UG4. All electrical parameters, package specifications, and compliance certifications are identical. Direct substitution is supported without circuit changes.

Q: What is the difference between INA155UG4 and INA155U?

A: The primary difference is packaging format and product status. The INA155UG4 is supplied in a specific packaging configuration and is discontinued. The INA155U is the active equivalent, supplied in tube packaging, with identical electrical performance and 8-SOIC package specifications.

Q: Are there any pin compatibility concerns?

A: No. Both parts use the 8-SOIC package with identical pinout. PCB layouts and socket designs require no modification.

Q: What is the supply voltage operating range for these parts?

A: Both the INA155UG4 and INA155U operate across a supply voltage range of 2.7V to 5.5V, supporting single-supply and dual-supply configurations within this range.

Q: What is the temperature operating range?

A: Both parts operate across -55°C to 125°C, suitable for industrial and extended-temperature applications.

Q: Are these parts RoHS compliant?

A: Yes. Both the INA155UG4 and INA155U are ROHS3 compliant with MSL 2 (1 Year) moisture sensitivity rating.

Q: What is the slew rate and bandwidth of these instrumentation amplifiers?

A: Both parts feature a slew rate of 6.5V/µs and -3dB bandwidth of 550 kHz, supporting signal conditioning applications requiring moderate bandwidth and slew rate performance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message