INA129SKGD1 Equivalent & Substitute Parts

Part Overview

The INA129SKGD1 is a single-channel instrumentation amplifier manufactured by Texas Instruments, designed for precision signal conditioning applications. This device operates across a wide supply voltage range of 4.5V to 36V and delivers a slew rate of 4V/µs with a -3dB bandwidth of 1.3 MHz. The INA129SKGD1 is currently in Last Time Buy status, indicating that the original packaging configuration is being phased out. Identifying qualified substitute parts ensures design continuity and maintains supply chain reliability for applications requiring instrumentation amplification with equivalent electrical performance.

Key Parameters

Parameter	Value
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	25 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 Range	-55°C to 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the INA129SKGD1 is determined by electrical parameter equivalence and compliance certification alignment. The primary substitute part, INA129UA/2K5, shares the identical base product number (INA129) and maintains all critical electrical specifications including slew rate, bandwidth, input bias current, input offset voltage, supply current, output current capability, and supply voltage range. Both parts are ROHS3 compliant and REACH unaffected, ensuring regulatory compatibility.

The key differentiator between these parts is the packaging configuration. The INA129SKGD1 utilizes a Die package (0-XCEPT), while the INA129UA/2K5 is supplied in an 8-SOIC (0.154", 3.90mm Width) package with Cut Tape and Digi-Reel® packaging options. The operating temperature range for the INA129UA/2K5 is -40°C to 125°C, which represents a narrower lower temperature specification compared to the INA129SKGD1 (-55°C to 125°C).

Substitution is valid when the application's operating temperature requirements fall within the -40°C to 125°C range and when the 8-SOIC package footprint is compatible with the circuit board design.

Parameter Comparison

Parameter	INA129SKGD1	INA129UA/2K5	Match Status
Amplifier Type	Instrumentation	Instrumentation	Equivalent
Number of Circuits	1	1	Equivalent
Slew Rate	4 V/µs	4 V/µs	Equivalent
-3dB Bandwidth	1.3 MHz	1.3 MHz	Equivalent
Current - Input Bias	2 nA	2 nA	Equivalent
Voltage - Input Offset	25 µV	25 µV	Equivalent
Current - Supply	700 µA	700 µA	Equivalent
Current - Output / Channel	15 mA	15 mA	Equivalent
Voltage - Supply Span (Min)	4.5 V	4.5 V	Equivalent
Voltage - Supply Span (Max)	36 V	36 V	Equivalent
Operating Temperature (Min)	-55°C	-40°C	Substitute has narrower range
Operating Temperature (Max)	125°C	125°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	Die (0-XCEPT)	8-SOIC (0.154", 3.90mm Width)	Different package
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

The INA129UA/2K5 is the manufacturer-recommended substitute for the INA129SKGD1. Both parts maintain identical electrical performance specifications and regulatory compliance certifications. Selection between these parts depends on two primary factors:

Product Status Consideration: The INA129SKGD1 is designated Last Time Buy, indicating limited future availability. The INA129UA/2K5 maintains Active product status with significantly higher inventory availability (15,414 pieces versus 896 pieces), supporting long-term supply chain stability.

Temperature Range Consideration: The INA129SKGD1 supports operation from -55°C to 125°C, while the INA129UA/2K5 operates from -40°C to 125°C. Applications requiring operation below -40°C must retain the INA129SKGD1. Applications operating within the -40°C to 125°C range can transition to the INA129UA/2K5 without electrical performance degradation.

Package Compatibility Consideration: The INA129SKGD1 Die package requires specialized handling and assembly processes. The INA129UA/2K5 8-SOIC package is standard for surface mount assembly and offers improved handling characteristics and availability through multiple packaging formats (Cut Tape and Digi-Reel®).

Frequently Asked Questions (FAQ)

Q: Are the electrical specifications identical between INA129SKGD1 and INA129UA/2K5?

A: Yes. Both parts share identical specifications for slew rate (4 V/µs), bandwidth (1.3 MHz), input bias current (2 nA), input offset voltage (25 µV), supply current (700 µA), output current (15 mA), and supply voltage range (4.5V to 36V). The only electrical difference is the operating temperature minimum: -55°C for INA129SKGD1 versus -40°C for INA129UA/2K5.

Q: What is the primary difference between these two parts?

A: The packaging configuration differs. The INA129SKGD1 uses a Die package (0-XCEPT), while the INA129UA/2K5 uses an 8-SOIC package. This affects circuit board layout, assembly processes, and component sourcing.

Q: Can I use INA129UA/2K5 in place of INA129SKGD1 in all applications?

A: Substitution is valid for applications operating within the -40°C to 125°C temperature range and where the 8-SOIC package footprint is compatible with the circuit board design. Applications requiring operation below -40°C must use the INA129SKGD1.

Q: Why is the INA129SKGD1 in Last Time Buy status?

A: Last Time Buy status indicates that the manufacturer is discontinuing this specific packaging configuration. The INA129UA/2K5 represents the active product line continuation with equivalent electrical performance.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the INA129SKGD1 and INA129UA/2K5 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What packaging options are available for the INA129UA/2K5?

A: The INA129UA/2K5 is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for different assembly and procurement workflows.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message