THS3122IDRG4 Equivalent & Substitute Parts

Part Overview

The THS3122IDRG4 is a current feedback amplifier manufactured by Texas Instruments, configured as a dual-circuit operational amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design requirements and production continuity. The THS3122IDRG4 delivers high-speed performance with a slew rate of 1550 V/µs and a gain bandwidth product of 138 MHz, making it suitable for applications requiring fast signal processing and wide bandwidth operation.

Substiute Parts

THS3122IDRG4

Texas InstrumentsIn Stock: 1082THS3122IDRG4 Datasheet

Current PartRFQ

UPC1251G2-E1-A

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the THS3122IDRG4 is determined by compatibility across the following critical parameters:

Functional Architecture: Both the main part and substitute must provide dual-circuit amplifier configurations in surface mount packages suitable for direct board-level integration.

Electrical Performance Envelope: Substitute parts must operate within the specified supply voltage range (10 V to 30 V minimum and maximum) and maintain compatible operating temperature specifications (-40°C to 85°C).

Package Compatibility: The 8-SOIC package form factor is the primary mechanical constraint. Substitute parts must use equivalent 8-pin SOIC or 8-SOP packages to ensure PCB footprint compatibility.

Compliance and Certification: All substitute parts must maintain ROHS3 compliance and MSL Level 1 rating to ensure manufacturing process compatibility and long-term reliability.

The UPC1251G2-E1-A from Renesas Electronics Corporation qualifies as a manufacturer-recommended substitute based on these criteria, despite differences in amplifier topology (general purpose versus current feedback) and certain electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The THS3122IDRG4 is classified as obsolete, making the UPC1251G2-E1-A a necessary alternative for new production and design continuity. The substitute part maintains active product status with Renesas Electronics Corporation, ensuring ongoing availability and manufacturing support.

Compliance Alignment: Both the main part and substitute maintain ROHS3 compliance and MSL Level 1 certification, confirming compatibility with current manufacturing processes and environmental regulations.

Supply Voltage Compatibility: The UPC1251G2-E1-A operates across a wider minimum supply voltage range (3 V to 30 V) compared to the THS3122IDRG4 (10 V to 30 V). Applications requiring operation below 10 V benefit from this extended range. Applications operating at 10 V and above remain fully compatible.

Package Footprint Consideration: The UPC1251G2-E1-A uses an 8-SOP package (0.173", 4.40mm width) versus the THS3122IDRG4's 8-SOIC package (0.154", 3.90mm width). While both are 8-pin surface mount packages, the slightly larger width of the SOP package requires verification of PCB layout clearances and routing constraints in existing designs.

Electrical Performance Trade-offs: The UPC1251G2-E1-A exhibits significantly lower input bias current (14 nA versus 6 µA) and lower supply current consumption (700 µA versus 8.4 mA), resulting in reduced power dissipation. However, the substitute provides lower output current per channel (70 mA versus 440 mA) and lacks the high slew rate (1550 V/µs) and bandwidth (138 MHz gain bandwidth product) of the original part. Applications requiring high-speed signal processing or high output current must evaluate whether the substitute meets performance requirements.

Frequently Asked Questions (FAQ)

Q: Can the UPC1251G2-E1-A directly replace the THS3122IDRG4 on existing PCBs?

A: Direct PCB replacement requires footprint verification. Both parts use 8-pin surface mount packages, but the UPC1251G2-E1-A (8-SOP, 4.40mm width) is slightly wider than the THS3122IDRG4 (8-SOIC, 3.90mm width). PCB layout clearances and trace routing must be confirmed before substitution. Pin-to-pin compatibility exists for standard dual-amplifier configurations.

Q: What are the key electrical differences between these parts?

A: The THS3122IDRG4 is a current feedback amplifier optimized for high-speed applications, delivering 1550 V/µs slew rate and 138 MHz gain bandwidth product with 440 mA output current per channel. The UPC1251G2-E1-A is a general purpose amplifier with lower power consumption (700 µA supply current versus 8.4 mA), lower input bias current (14 nA versus 6 µA), but reduced output current capability (70 mA versus 440 mA) and no specified high-speed performance metrics. Application requirements for bandwidth, slew rate, and output current determine suitability.

Q: Are both parts compliant with current manufacturing standards?

A: Yes. Both the THS3122IDRG4 and UPC1251G2-E1-A maintain ROHS3 compliance and MSL Level 1 certification. The UPC1251G2-E1-A holds active product status, ensuring ongoing manufacturing support and availability.

Q: What supply voltage range applies to the UPC1251G2-E1-A?

A: The UPC1251G2-E1-A operates across 3 V to 30 V supply range, compared to the THS3122IDRG4's 10 V to 30 V range. This extended lower voltage capability enables use in low-voltage applications. Both parts support the full 30 V maximum specification.

Q: How do the input offset voltage specifications compare?

A: The UPC1251G2-E1-A specifies 2 mV input offset voltage, compared to 4.4 mV for the THS3122IDRG4. The substitute provides superior input offset performance, beneficial for precision analog signal processing applications.

Q: Is the substitute part available in the same packaging format?

A: Both parts use 8-pin surface mount packages suitable for automated assembly. The THS3122IDRG4 uses 8-SOIC packaging, while the UPC1251G2-E1-A uses 8-SOP packaging. Both are standard industry formats with equivalent pin counts and similar footprints, though the SOP variant has slightly larger body dimensions.