THS3122IDR Equivalent & Substitute Parts

Part Overview

The THS3122IDR is a current feedback amplifier manufactured by Texas Instruments, featuring two circuits in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The THS3122IDR delivers high slew rate performance (1550V/µs) and wide gain bandwidth product (138 MHz), suitable for applications requiring fast signal processing in compact form factors.

Substiute Parts

THS3122IDR

Texas InstrumentsIn Stock: 1141THS3122IDR Datasheet

Current PartRFQ

LT1253CS8#PBF

Analog Devices Inc.In Stock: 1219LT1253CS8#PBF Datasheet

MFR RecommendedRFQ

LT1253CS8#TRPBF

Analog Devices Inc.In Stock: 4322LT1253CS8#TRPBF Datasheet

MFR RecommendedRFQ

UPC1251G2-E1-A

Renesas Electronics CorporationIn Stock: 5934UPC1251G2-E1-A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the THS3122IDR is determined by compatibility across the following critical parameters:

Package Compatibility: All substitute parts must use 8-SOIC surface mount packaging with 0.154" (3.90mm) width to ensure direct PCB footprint compatibility.

Functional Classification: The THS3122IDR is a current feedback amplifier with dual circuits. Substitute parts must maintain this amplifier topology and dual-circuit configuration.

Supply Voltage Range: The THS3122IDR operates across 10V to 30V supply span. Substitute parts must support this voltage range or a compatible subset that covers the application's operating conditions.

Thermal Operating Range: All substitutes must support the -40°C to 85°C operating temperature range.

Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating to ensure manufacturing and storage compatibility.

The identified substitute parts are:

LT1253CS8#PBF and LT1253CS8#TRPBF (Analog Devices Inc.) — Active status current feedback amplifiers with dual circuits in 8-SOIC packaging. These parts differ in packaging format (Tube vs. Tape & Reel) but share identical electrical specifications.

UPC1251G2-E1-A (Renesas Electronics Corporation) — Active status general purpose amplifier with dual circuits and push-pull output configuration in 8-SOIC packaging.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Current Feedback Topology):

The LT1253CS8#PBF and LT1253CS8#TRPBF are functionally equivalent current feedback amplifiers with active product status. Both parts maintain the dual-circuit configuration and 8-SOIC package footprint of the THS3122IDR. The primary distinction between these two Analog Devices parts is packaging format: LT1253CS8#PBF is supplied in Tube packaging, while LT1253CS8#TRPBF is supplied in Tape & Reel format. Selection between these variants depends on procurement and assembly requirements. Both parts are ROHS3 compliant with MSL 1 rating, ensuring compatibility with existing manufacturing processes.

For General Purpose Applications:

The UPC1251G2-E1-A from Renesas Electronics Corporation is an active general purpose amplifier with dual circuits in 8-SOIC packaging. This part differs from the THS3122IDR in amplifier topology (general purpose vs. current feedback) and output configuration (push-pull). The UPC1251G2-E1-A exhibits significantly lower supply current (0.7 mA vs. 8.4 mA) and operates across a wider minimum supply voltage range (3V vs. 10V). This part is suitable for applications where current feedback topology is not required and lower power consumption is beneficial. The UPC1251G2-E1-A is ROHS3 compliant with MSL 1 rating.

Compliance Verification:

All identified substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001, maintaining consistent regulatory classification with the original THS3122IDR.

Frequently Asked Questions (FAQ)

Q: Can the LT1253CS8#PBF directly replace the THS3122IDR in existing designs?

A: The LT1253CS8#PBF shares the same 8-SOIC package footprint, dual-circuit current feedback topology, and supply voltage range compatibility with the THS3122IDR. Both parts are ROHS3 compliant with MSL 1 rating. However, electrical performance differs: the LT1253CS8#PBF provides higher -3dB bandwidth (270 MHz vs. 160 MHz) but lower slew rate (250V/µs vs. 1550V/µs) and reduced output current per channel (55 mA vs. 440 mA). Direct replacement is feasible only if the application does not depend on the THS3122IDR's high slew rate or output current specifications.

Q: What is the difference between LT1253CS8#PBF and LT1253CS8#TRPBF?

A: Both parts are electrically identical current feedback amplifiers from Analog Devices Inc. The difference is packaging format: LT1253CS8#PBF is supplied in Tube packaging, while LT1253CS8#TRPBF is supplied in Tape & Reel (TR) format. Selection depends on assembly line requirements and procurement preferences. Tape & Reel format is typically preferred for automated assembly processes.

Q: Is the UPC1251G2-E1-A suitable as a substitute for the THS3122IDR?

A: The UPC1251G2-E1-A is a general purpose amplifier, not a current feedback amplifier. While both are dual-circuit devices in 8-SOIC packaging with ROHS3 compliance, the UPC1251G2-E1-A differs significantly in topology and performance. The UPC1251G2-E1-A is suitable only for applications where current feedback topology is not required. The UPC1251G2-E1-A offers lower supply current (0.7 mA) and operates at lower minimum supply voltage (3V), making it advantageous for power-constrained applications.

Q: Are all substitute parts compatible with the THS3122IDR's -40°C to 85°C operating temperature range?

A: The LT1253CS8#PBF and LT1253CS8#TRPBF do not specify operating temperature range in the provided data. The UPC1251G2-E1-A explicitly supports -40°C to 85°C operating temperature. Verify operating temperature specifications with the manufacturer before selecting LT1253 variants for temperature-critical applications.

Q: Do all substitute parts maintain the same package dimensions?

A: The LT1253CS8#PBF and LT1253CS8#TRPBF use 8-SOIC packaging with 0.154" (3.90mm) width, matching the THS3122IDR exactly. The UPC1251G2-E1-A uses 8-SOIC packaging with 0.173" (4.40mm) width, which is slightly wider. Verify PCB layout clearances before substituting the UPC1251G2-E1-A to ensure no mechanical conflicts with adjacent components.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The LT1253CS8#PBF, LT1253CS8#TRPBF, and UPC1251G2-E1-A are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, maintaining compatibility with standard manufacturing and storage requirements.