THS4031CDR Equivalent & Substitute Parts

Part Overview

The THS4031CDR is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, indicating that it is no longer in active production. The THS4031CDR delivers a slew rate of 100V/µs with a -3dB bandwidth of 100 MHz, making it suitable for applications requiring moderate-speed signal amplification with controlled feedback characteristics.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, system maintenance, and procurement of replacement inventory. Substitute parts must maintain electrical compatibility across critical parameters including slew rate, bandwidth, supply voltage range, and output current specifications, while accommodating the 8-SOIC package form factor.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Slew Rate	100	V/µs
-3dB Bandwidth	100	MHz
Current - Input Bias	3	µA
Voltage - Input Offset	500	µV
Current - Supply	8.5	mA
Current - Output / Channel	90	mA
Voltage - Supply Span (Min)	9	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution logic for the THS4031CDR is based on the following critical parameters that must be maintained or exceeded:

Electrical Compatibility Criteria:

Amplifier type classification (voltage feedback or general purpose)
Slew rate performance (minimum 100V/µs)
Bandwidth capability (minimum 100 MHz)
Supply voltage range compatibility (9V to 32V overlap required)
Output current capability (minimum 90 mA per channel)
Input bias current and offset voltage specifications

Mechanical Compatibility Criteria:

Package form factor: 8-SOIC (0.154", 3.90mm Width)
Surface mount mounting type
Pin count and pinout compatibility

Substitute parts are grouped into two categories:

Category 1: Direct Manufacturer Equivalents (Texas Instruments) The THS4031IDR represents the active production equivalent of the obsolete THS4031CDR, maintaining identical electrical specifications while offering an extended operating temperature range and active product status.

Category 2: Cross-Manufacturer Alternatives (Analog Devices / Linear Technology) The LT1222 series (LT1222CS8#PBF, LT1222IS8, LT1222IS8#PBF) provides functional substitution with enhanced performance characteristics. These devices operate as general-purpose amplifiers with superior slew rate (200V/µs) and gain bandwidth product (500 MHz), accommodating the same 8-SOIC package and supply voltage requirements.

Parameter Comparison

Parameter	THS4031CDR	THS4031IDR	LT1222CS8#PBF	LT1222IS8	LT1222IS8#PBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Linear Technology	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active
Amplifier Type	Voltage Feedback	Voltage Feedback	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1
Slew Rate (V/µs)	100	100	200	200	200
-3dB Bandwidth (MHz)	100	100	500 (GBW)	500 (GBW)	500 (GBW)
Current - Input Bias (µA)	3	3	0.1	0.1	0.1
Voltage - Input Offset (µV)	500	500	100	100	100
Current - Supply (mA)	8.5	8.5	8	8	8
Current - Output / Channel (mA)	90	90	26	26	26
Voltage - Supply Span Min (V)	9	9	10	10	10
Voltage - Supply Span Max (V)	32	32	30	30	30
Operating Temperature (°C)	0 to 70	-40 to 85	0 to 70	-40 to 85	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Affected	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: THS4031IDR

The THS4031IDR is the manufacturer-recommended direct equivalent for the obsolete THS4031CDR. This part maintains identical electrical specifications including slew rate (100V/µs), bandwidth (100 MHz), and output current (90 mA). The THS4031IDR carries active product status, ensuring long-term availability and supply chain continuity. The extended operating temperature range (-40°C to 85°C) provides broader environmental compatibility compared to the original part. Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and replacements.

Secondary Recommendation: LT1222IS8#PBF

The LT1222IS8#PBF provides functional substitution with enhanced performance characteristics. This device delivers superior slew rate (200V/µs) and gain bandwidth product (500 MHz), enabling higher-speed signal processing. The LT1222IS8#PBF maintains the same 8-SOIC package form factor and operates within the required supply voltage range (10V to 30V, overlapping with the THS4031CDR specification of 9V to 32V). This part carries active product status, ROHS3 compliance, and REACH unaffected status. However, the output current capability (26 mA) is lower than the THS4031CDR (90 mA), requiring circuit design verification for applications demanding high output current.

Alternative Consideration: LT1222CS8#PBF

The LT1222CS8#PBF offers identical electrical performance to the LT1222IS8#PBF with the same package compatibility. This variant operates over the commercial temperature range (0°C to 70°C), matching the original THS4031CDR temperature specification. Selection between LT1222CS8#PBF and LT1222IS8#PBF depends on required operating temperature range and supply chain availability.

Not Recommended: LT1222IS8

The LT1222IS8 (without #PBF suffix) exhibits RoHS non-compliance and REACH affected status, making it unsuitable for applications subject to environmental and regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the THS4031IDR be used as a direct replacement for the THS4031CDR?

A: Yes. The THS4031IDR is the active production equivalent of the obsolete THS4031CDR. Both devices share identical electrical specifications including slew rate, bandwidth, supply voltage range, and output current. The THS4031IDR provides an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), offering improved environmental compatibility. Pin configuration and package form factor are identical, enabling direct substitution without circuit modification.

Q: What are the key differences between the THS4031CDR and LT1222 series?

A: The primary differences are amplifier classification and performance characteristics. The THS4031CDR is a voltage feedback amplifier, while the LT1222 series operates as general-purpose amplifiers. The LT1222 series delivers superior slew rate (200V/µs versus 100V/µs) and gain bandwidth product (500 MHz versus 100 MHz). However, the LT1222 series exhibits lower output current capability (26 mA versus 90 mA). Both device families maintain 8-SOIC package compatibility and overlapping supply voltage ranges. Circuit design verification is required when substituting the LT1222 series in applications requiring high output current.

Q: Are there supply voltage compatibility issues when substituting the LT1222 series?

A: The supply voltage ranges overlap but do not match exactly. The THS4031CDR operates from 9V to 32V, while the LT1222 series operates from 10V to 30V. Applications using supply voltages below 10V or above 30V cannot use the LT1222 series. Designs operating within the 10V to 30V window are compatible with both device families.

Q: What is the significance of the #PBF suffix in part numbers?

A: The #PBF suffix indicates lead-free (Pb-free) packaging, confirming RoHS compliance. Parts with this designation meet ROHS3 requirements and are suitable for applications subject to environmental regulations. The LT1222IS8 (without #PBF) does not carry this certification and exhibits RoHS non-compliance.

Q: Can the LT1222 series be used in applications requiring 90 mA output current?

A: No. The LT1222 series is rated for 26 mA output current per channel, significantly lower than the THS4031CDR specification of 90 mA. Applications requiring 90 mA output current must use the THS4031IDR or verify that circuit design can operate within the 26 mA limitation of the LT1222 series.

Q: What compliance certifications should be verified for new designs?

A: New designs should prioritize parts with ROHS3 compliance and REACH unaffected status. The THS4031IDR, LT1222CS8#PBF, and LT1222IS8#PBF all meet these requirements. The LT1222IS8 (without #PBF) exhibits RoHS non-compliance and REACH affected status, making it unsuitable for regulated applications.

Q: Is the 8-SOIC package compatible across all substitute parts?

A: Yes. All substitute parts listed (THS4031IDR, LT1222CS8#PBF, LT1222IS8, LT1222IS8#PBF) are housed in 8-SOIC packages with identical dimensions (0.154" width, 3.90mm). Pin count and spacing are compatible, enabling direct board-level substitution without PCB redesign.

Q: What is the input bias current difference between the THS4031CDR and LT1222 series?

A: The THS4031CDR specifies 3 µA input bias current, while the LT1222 series specifies 100 nA. The LT1222 series exhibits significantly lower input bias current, which may improve circuit performance in applications sensitive to input current effects. However, existing circuit designs must be verified to ensure compatibility with this lower specification.

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