OPA129UB/2K5 Equivalent & Substitute Parts

Part Overview

The OPA129UB/2K5 is a general-purpose operational amplifier manufactured by Texas Instruments in the Difet® series. This device is a single-circuit, 8-SOIC surface-mount amplifier designed for general-purpose applications requiring low input bias current and moderate bandwidth performance. The part is classified as obsolete, necessitating identification of active substitute components that maintain functional and electrical compatibility for ongoing system support and new designs.

Substiute Parts

OPA129UB/2K5

Texas InstrumentsIn Stock: 2102OPA129UB/2K5 Datasheet

Current PartRFQ

OPA145IDR

Texas InstrumentsIn Stock: 5640OPA145IDR Datasheet

MFR RecommendedRFQ

AD825ARZ

Analog Devices Inc.In Stock: 3588AD825ARZ Datasheet

MFR RecommendedRFQ

AD825ARZ-REEL

Analog Devices Inc.In Stock: 3680AD825ARZ-REEL Datasheet

MFR RecommendedRFQ

AD825ARZ-REEL7

Analog Devices Inc.In Stock: 18187AD825ARZ-REEL7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA129UB/2K5 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface-mount package to ensure PCB footprint compatibility.

Electrical Operating Range: Substitute parts must support the voltage supply span of 10 V to 36 V minimum to maximum, ensuring operation within the original design envelope.

Functional Classification: The OPA129UB/2K5 is a general-purpose amplifier. Substitute parts classified as J-FET amplifiers are functionally compatible within this category, as both serve general-purpose amplification roles in the linear amplifier classification.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and EAR99 ECCN classification to satisfy regulatory and export requirements.

Surface Mount Technology: All substitutes must be surface-mount devices to maintain manufacturing process compatibility.

The identified substitute parts—OPA145IDR, AD825ARZ, AD825ARZ-REEL, and AD825ARZ-REEL7—meet these substitution criteria. These parts are active products with established supply chains, addressing the obsolescence status of the OPA129UB/2K5.

Parameter Comparison

Engineering Selection Recommendations

OPA145IDR (Texas Instruments): This substitute is an active product offering improved performance characteristics over the OPA129UB/2K5, including higher slew rate (20 V/µs versus 2.5 V/µs), increased gain bandwidth product (5.5 MHz versus 1 MHz), and lower input offset voltage (40 µV versus 500 µV). The OPA145IDR features rail-to-rail output capability and operates across an extended temperature range (-55°C to 150°C). It maintains ROHS3 compliance and offers superior moisture sensitivity rating (MSL 2). This part is recommended for applications where performance enhancement and extended operating temperature range are beneficial.

AD825ARZ, AD825ARZ-REEL, AD825ARZ-REEL7 (Analog Devices Inc.): These three variants represent the same electrical device with different packaging configurations. The AD825 series delivers significantly higher performance: slew rate of 140 V/µs, gain bandwidth product of 26 MHz, and -3dB bandwidth of 46 MHz. These parts maintain ROHS3 compliance and offer unlimited moisture sensitivity (MSL 1). The AD825 series is suitable for applications requiring high-speed amplification and superior dynamic performance. The three variants differ only in packaging format: AD825ARZ (Tube), AD825ARZ-REEL (Cut Tape & Digi-Reel®), and AD825ARZ-REEL7 (Cut Tape & Digi-Reel®). Selection among these variants depends on procurement and assembly requirements.

Compliance and Regulatory Status: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification, ensuring regulatory compatibility with the original OPA129UB/2K5 design requirements.

Frequently Asked Questions (FAQ)

Q: Why is the OPA129UB/2K5 being replaced?

A: The OPA129UB/2K5 is classified as obsolete. Substitute parts are identified to ensure continued availability for system support, maintenance, and new design implementations.

Q: Are all substitute parts pin-compatible with the OPA129UB/2K5?

A: All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring identical PCB footprint compatibility. Pin configuration compatibility must be verified against the specific application schematic.

Q: What is the primary difference between OPA145IDR and the AD825 variants?

A: The OPA145IDR offers moderate performance enhancement with 20 V/µs slew rate and 5.5 MHz bandwidth. The AD825 series provides significantly higher performance with 140 V/µs slew rate and 26 MHz bandwidth. Selection depends on application bandwidth and speed requirements.

Q: Can I use AD825ARZ, AD825ARZ-REEL, or AD825ARZ-REEL7 interchangeably?

A: These three parts are electrically identical. They differ only in packaging format: tube, cut tape with standard reel, and cut tape with alternative reel configuration. Selection depends on procurement, storage, and assembly line requirements.

Q: What are the supply voltage compatibility considerations?

A: The OPA129UB/2K5 requires minimum 10 V supply. The OPA145IDR operates from 4.5 V minimum, providing greater flexibility in lower-voltage applications. The AD825 series requires minimum 10 V, matching the original specification. All parts support maximum 36 V supply.

Q: How do moisture sensitivity levels affect handling and storage?

A: The OPA129UB/2K5 has MSL 3 (168 hours), requiring controlled storage conditions. Substitute parts offer improved ratings: OPA145IDR (MSL 2, 1 year) and AD825 variants (MSL 1, unlimited), reducing moisture-related handling constraints and extending shelf life.

Q: Are there temperature range considerations for substitution?

A: The OPA129UB/2K5 operates -40°C to 85°C. The OPA145IDR extends this to -55°C to 150°C, suitable for wider temperature applications. The AD825 series maintains -40°C to 85°C range, matching the original specification.

Q: Do all substitutes maintain regulatory compliance?

A: All substitute parts are ROHS3 compliant, REACH unaffected, and classified as EAR99, maintaining full regulatory compatibility with the original OPA129UB/2K5 design requirements.