THS3121IDR Equivalent & Substitute Parts

Part Overview

The THS3121IDR is a current feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as a linear amplifier with a single circuit configuration and is currently listed as obsolete. The THS3121IDR delivers high-speed amplification with a slew rate of 1700V/µs and a -3dB bandwidth of 130 MHz, making it suitable for applications requiring fast signal processing and high-frequency operation. Due to its obsolete status, identifying equivalent and substitute parts is necessary to ensure design continuity and component availability for new production runs and system maintenance.

Substiute Parts

THS3121IDR

Texas InstrumentsIn Stock: 1130THS3121IDR Datasheet

Current PartRFQ

THS3121ID

Texas InstrumentsIn Stock: 66008THS3121ID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the THS3121IDR is determined by strict equivalence across all electrical and mechanical parameters. The primary substitute part, THS3121ID, maintains identical specifications across all critical performance characteristics: amplifier type, circuit count, slew rate, bandwidth, input bias current, input offset voltage, supply current, output current capability, supply voltage range, and operating temperature range. Both parts utilize the same 8-SOIC surface mount package with identical physical dimensions and pin configuration, ensuring mechanical compatibility without PCB redesign.

The substitution is valid based on the following key parameters:

• Amplifier Type: Current Feedback (identical)
• Number of Circuits: 1 (identical)
• Slew Rate: 1700V/µs (identical)
• -3dB Bandwidth: 130 MHz (identical)
• Input Bias Current: 3 µA (identical)
• Input Offset Voltage: 2 mV (identical)
• Supply Current: 7mA (identical)
• Output Current per Channel: 490 mA (identical)
• Supply Voltage Range: 10V to 30V (identical)
• Operating Temperature Range: -40°C to 85°C (identical)
• Package Type: 8-SOIC (identical)
• Pin Configuration: 8-pin (identical)

Parameter Comparison

Engineering Selection Recommendations

The THS3121ID is the direct equivalent substitute for the obsolete THS3121IDR. Both parts are manufactured by Texas Instruments and share identical electrical specifications, performance characteristics, and physical packaging. The THS3121ID maintains active product status with significantly higher inventory availability (65,980 pieces in stock versus 1,110 pieces for the obsolete variant), ensuring reliable supply chain continuity.

Both parts comply with ROHS3 standards and are REACH unaffected, meeting current environmental and regulatory requirements. The THS3121ID is supplied in tube packaging, which is standard for active production components. The substitution requires no circuit redesign, PCB layout modifications, or firmware changes, as all electrical and mechanical parameters are identical.

For applications currently using the THS3121IDR, direct replacement with the THS3121ID is appropriate without functional or performance degradation. The active status of the THS3121ID ensures long-term availability and support from the manufacturer.

Frequently Asked Questions (FAQ)

Q: Can the THS3121ID directly replace the THS3121IDR without circuit modifications?

A: Yes. The THS3121ID is a direct equivalent substitute with identical electrical specifications, performance characteristics, and 8-SOIC package dimensions. No circuit redesign or PCB layout changes are required.

Q: What is the primary difference between the THS3121IDR and THS3121ID?

A: The THS3121IDR is obsolete, while the THS3121ID maintains active product status. All electrical and mechanical specifications are identical. The THS3121ID is supplied in tube packaging and has substantially higher inventory availability.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical environmental certifications. Both have Moisture Sensitivity Level 1 (Unlimited).

Q: What is the pin configuration compatibility between these parts?

A: Both parts use the 8-SOIC package with identical pin assignments and physical dimensions (0.154" width, 3.90mm). Pin-for-pin compatibility is complete.

Q: Why should I select the THS3121ID over the THS3121IDR?

A: The THS3121ID is the active production equivalent with superior supply chain availability. The THS3121IDR is obsolete and has limited inventory. For new designs and production runs, the THS3121ID is the appropriate selection.

Q: Are the slew rate and bandwidth specifications identical?

A: Yes. Both parts deliver 1700V/µs slew rate and 130 MHz -3dB bandwidth. All dynamic performance parameters are identical.

Q: What is the operating temperature range for both parts?

A: Both the THS3121IDR and THS3121ID operate across the identical temperature range of -40°C to 85°C.

Q: Can I use these parts interchangeably in existing designs?

A: Yes. The THS3121ID is a direct functional and mechanical equivalent to the THS3121IDR. Existing designs using the THS3121IDR can be updated to use the THS3121ID without any modifications.