THS4021CD Equivalent & Substitute Parts

Part Overview

The THS4021CD is a voltage 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, delivering high-speed signal amplification with a slew rate of 470V/µs and -3dB bandwidth of 350 MHz.

The THS4021CD carries an Obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this amplifier topology.

Substiute Parts

THS4021CD

Texas InstrumentsIn Stock: 2235THS4021CD Datasheet

Current PartRFQ

THS4021IDR

Texas InstrumentsIn Stock: 5653THS4021IDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the THS4021CD is determined by electrical and mechanical parameter equivalence within the voltage feedback amplifier category. The primary substitute identified is the THS4021IDR, which maintains identical electrical specifications across all critical performance parameters: slew rate, bandwidth, input bias current, input offset voltage, supply current, output current capability, and supply voltage range.

The substitution logic is based on the following key parameters:

• Amplifier topology (Voltage Feedback)
• Single circuit configuration
• Identical slew rate (470V/µs)
• Identical -3dB bandwidth (350 MHz)
• Matching input and output electrical characteristics
• Identical package form factor (8-SOIC)
• Surface mount compatibility

The THS4021IDR differs from the THS4021CD in product status (Active versus Obsolete), packaging format (Tape & Reel versus standard), and operating temperature range (-40°C to 85°C versus 0°C to 70°C). These differences do not affect functional substitution in applications designed within the THS4021CD operating envelope.

Parameter Comparison

Engineering Selection Recommendations

The THS4021IDR is the direct manufacturer-recommended substitute for the obsolete THS4021CD. Both devices are manufactured by Texas Instruments and maintain identical electrical performance specifications across all measured parameters.

Selection of the THS4021IDR is supported by the following factors:

• Active product status ensures ongoing availability and manufacturing support
• ROHS3 compliance and REACH unaffected status match the original part
• Extended operating temperature range (-40°C to 85°C) provides broader environmental coverage than the original specification (0°C to 70°C)
• Identical electrical characteristics enable direct functional replacement
• 8-SOIC surface mount package maintains PCB layout compatibility
• Tape & Reel packaging format supports automated assembly processes

For applications operating within the THS4021CD temperature envelope (0°C to 70°C), the THS4021IDR operates within its specified range and presents no thermal derating concerns.

Frequently Asked Questions (FAQ)

Q: Can the THS4021IDR directly replace the THS4021CD in existing designs?

A: Yes. The THS4021IDR provides identical electrical performance across all specified parameters including slew rate, bandwidth, input bias current, input offset voltage, supply current, and output current capability. The 8-SOIC package footprint is identical, enabling direct PCB substitution.

Q: What is the significance of the different operating temperature ranges?

A: The THS4021CD operates from 0°C to 70°C, while the THS4021IDR operates from -40°C to 85°C. For applications designed within the THS4021CD temperature specification, the THS4021IDR operates within its qualified range. The extended range of the THS4021IDR does not affect performance in the narrower operating window.

Q: Why is the THS4021CD classified as Obsolete?

A: The Obsolete status indicates that Texas Instruments has discontinued production of this part number. The THS4021IDR represents the active production equivalent, ensuring continued supply chain access for this amplifier topology.

Q: Are there packaging differences between these parts?

A: The THS4021CD is supplied in standard packaging, while the THS4021IDR is supplied in Tape & Reel (TR) format. Both use the identical 8-SOIC (0.154", 3.90mm Width) package form factor. Tape & Reel packaging is standard for automated assembly processes.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the THS4021CD and THS4021IDR are ROHS3 compliant and REACH unaffected, maintaining identical regulatory compliance status.

Q: What supply voltage range is supported?

A: Both parts operate across a 9V to 32V supply span, providing flexibility for single and dual supply configurations within this range.

Q: Is the input bias current specification identical?

A: Yes. Both parts specify 3 µA input bias current and 500 µV input offset voltage, ensuring equivalent DC operating point characteristics in circuit designs.