THS4031CD Equivalent & Substitute Parts

Part Overview

The THS4031CD is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as a Last Time Buy product, indicating discontinued production with limited remaining inventory. The THS4031CD delivers 100 V/µs slew rate and 100 MHz bandwidth, suitable for applications requiring moderate-speed signal conditioning and amplification. Due to its Last Time Buy status, identification of functionally equivalent substitute components is necessary for design continuity and long-term supply chain planning.

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	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the THS4031CD is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Package type: 8-SOIC surface mount form factor
Amplifier topology: Voltage feedback configuration
Single circuit count
Supply voltage range compatibility: minimum 9 V, maximum 32 V
Slew rate: 100 V/µs or greater
Bandwidth: 100 MHz or greater
Input bias current: 3 µA or lower
Input offset voltage: 500 µV or lower
Output current capability: 90 mA or greater per channel
Supply current: 8.5 mA or lower

Substitute Part Categories:

Category 1: Direct Manufacturer Equivalent (Texas Instruments) The THS4031IDR is the manufacturer-recommended direct equivalent, offering identical electrical specifications with extended operating temperature range and Active product status.

Category 2: Cross-Manufacturer Alternatives (Analog Devices Inc.) The LT1222 series (LT1222CS8#PBF, LT1222CS8#TRPBF, LT1222IS8, LT1222IS8#PBF) provides functional substitution with enhanced performance characteristics. These devices exceed the minimum parameter requirements while maintaining 8-SOIC package compatibility and surface mount configuration.

Parameter Comparison

Parameter	THS4031CD	THS4031IDR	LT1222CS8#PBF	LT1222CS8#TRPBF	LT1222IS8	LT1222IS8#PBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Linear Technology	Analog Devices Inc.
Amplifier Type	Voltage Feedback	Voltage Feedback	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1
Slew Rate (V/µs)	100	100	200	200	200	200
Bandwidth (MHz)	100	100	500	500	500	500
Current - Input Bias (µA)	3	3	0.1	0.1	0.1	0.1
Voltage - Input Offset (µV)	500	500	100	100	100	100
Current - Supply (mA)	8.5	8.5	8	8	8	8
Current - Output / Channel (mA)	90	90	26	26	26	26
Voltage - Supply Span Min (V)	9	9	10	10	10	10
Voltage - Supply Span Max (V)	32	32	30	30	30	30
Operating Temperature (°C)	0 to 70	-40 to 85	0 to 70	0 to 70	-40 to 85	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Last Time Buy	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: THS4031IDR

The THS4031IDR is the manufacturer-recommended equivalent from Texas Instruments. This part maintains identical electrical specifications to the THS4031CD while offering Active product status, ensuring long-term availability. The THS4031IDR provides an extended operating temperature range (-40°C to 85°C) compared to the THS4031CD (0°C to 70°C), enabling deployment in wider environmental conditions. Both devices are ROHS3 compliant and carry identical supply voltage specifications (9 V to 32 V). Current inventory of 4,390 units supports immediate procurement.

Secondary Recommendation: LT1222IS8#PBF

The LT1222IS8#PBF from Analog Devices Inc. provides functional substitution with performance enhancements. This device exceeds the THS4031CD specifications in slew rate (200 V/µs versus 100 V/µs), bandwidth (500 MHz versus 100 MHz), input bias current (0.1 µA versus 3 µA), and input offset voltage (100 µV versus 500 µV). The LT1222IS8#PBF operates across -40°C to 85°C, extending the temperature envelope. However, output current per channel is reduced to 26 mA (versus 90 mA on THS4031CD), and maximum supply voltage is limited to 30 V (versus 32 V). The LT1222IS8#PBF is ROHS3 compliant with 2,323 units in stock.

Alternative Consideration: LT1222CS8#PBF and LT1222CS8#TRPBF

Both LT1222CS8 variants offer identical electrical performance to LT1222IS8#PBF with operating temperature limited to 0°C to 70°C, matching the THS4031CD temperature range. LT1222CS8#PBF is supplied in Tube packaging (1,331 units available), while LT1222CS8#TRPBF is supplied in Tape & Reel format (2,000 units available). Both are ROHS3 compliant.

Not Recommended: LT1222IS8 (Bulk)

The LT1222IS8 in Bulk packaging is RoHS non-compliant and carries REACH Affected status, making it unsuitable for applications requiring regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q1: Can the THS4031IDR directly replace the THS4031CD without circuit modification?

A: Yes. The THS4031IDR maintains identical electrical specifications across all critical parameters: slew rate (100 V/µs), bandwidth (100 MHz), input bias current (3 µA), input offset voltage (500 µV), supply current (8.5 mA), output current (90 mA), and supply voltage range (9 V to 32 V). Both devices use the 8-SOIC package with identical pinout. No circuit redesign is required.

Q2: What are the trade-offs when substituting with LT1222 series devices?

A: The LT1222 series provides superior performance in slew rate (200 V/µs), bandwidth (500 MHz), input bias current (0.1 µA), and input offset voltage (100 µV). However, output current capability is reduced from 90 mA to 26 mA per channel, and maximum supply voltage decreases from 32 V to 30 V. Applications requiring high output current or operating near 32 V supply voltage cannot use LT1222 substitutes without circuit modification.

Q3: Are all substitute parts available in the same package format?

A: All substitute parts use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width. Packaging format differs: THS4031IDR is supplied in standard packaging, LT1222CS8#PBF in Tube, LT1222CS8#TRPBF in Tape & Reel, and LT1222IS8 variants in Bulk or Tube. PCB footprint compatibility is maintained across all variants.

Q4: Which substitute part offers the widest operating temperature range?

A: Both THS4031IDR and LT1222IS8#PBF operate across -40°C to 85°C, providing the widest temperature envelope. The THS4031CD and LT1222CS8 variants are limited to 0°C to 70°C. For applications requiring extended low-temperature operation, THS4031IDR or LT1222IS8#PBF are required.

Q5: What is the compliance status of each substitute part?

A: THS4031IDR, LT1222CS8#PBF, LT1222CS8#TRPBF, and LT1222IS8#PBF are all ROHS3 compliant with REACH Unaffected status. The LT1222IS8 (Bulk) is RoHS non-compliant and REACH Affected, disqualifying it from regulated applications. For compliance-critical applications, use only ROHS3-compliant variants.

Q6: Is the THS4031CD still available for new designs?

A: No. The THS4031CD carries Last Time Buy status, indicating production discontinuation. Existing inventory of 1,814 units is available, but no future production is planned. New designs should specify THS4031IDR or alternative LT1222 series devices to ensure long-term supply availability.

Q7: Can LT1222 devices be used in high-current output applications?

A: No. The LT1222 series provides only 26 mA output current per channel, compared to 90 mA on the THS4031CD. Applications requiring output currents exceeding 26 mA must retain the THS4031CD or THS4031IDR, or implement external output buffering stages.

Q8: What inventory levels support immediate procurement?

A: THS4031IDR offers the highest inventory at 4,390 units. LT1222IS8#PBF provides 2,323 units, LT1222CS8#TRPBF provides 2,000 units, and LT1222CS8#PBF provides 1,331 units. All quantities support production-scale procurement without extended lead times.

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