THS4051IDRG4 Equivalent & Substitute Parts

Part Overview

The THS4051IDRG4 is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The THS4051IDRG4 delivers a slew rate of 240V/µs with a -3dB bandwidth of 70 MHz, making it suitable for applications requiring moderate-speed signal conditioning and amplification in the 9V to 32V supply range.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Slew Rate	240	V/µs
-3dB Bandwidth	70	MHz
Current - Input Bias	2.5	µA
Voltage - Input Offset	2.5	mV
Current - Supply	8.5	mA
Current - Output / Channel	100	mA
Voltage - Supply Span (Min)	9	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the THS4051IDRG4 is determined by strict alignment of electrical and mechanical parameters within the linear amplifier category. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

Package compatibility: 8-SOIC form factor (0.154", 3.90mm Width)
Surface mount mounting type
Supply voltage range: minimum 9V, maximum 32V
Single circuit configuration
Operating temperature range: -40°C to 85°C minimum
RoHS3 compliance and MSL Level 1 rating

Secondary Electrical Parameters:

Slew rate: 240V/µs or greater
Bandwidth performance: 70 MHz or greater (-3dB)
Input bias current: 2.5µA or lower
Input offset voltage: 2.5mV or lower
Output current capability: 100mA or greater per channel
Supply current: 8.5mA or lower

Substitute parts must satisfy all primary criteria and maintain electrical performance within the specified ranges to ensure functional equivalence in circuit applications.

Parameter Comparison

Parameter	THS4051IDRG4	THS4051IDR	AD847JRZ-REEL7	LT1220CS8	LT1220CS8#PBF	LT1220CS8#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Linear Technology	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Obsolete	Active	Active
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)	240	240	300	250	250	250
Bandwidth / Gain-Bandwidth Product (MHz)	70	70	50	45	45	45
Current - Input Bias (µA)	2.5	2.5	3.3	0.1	0.1	0.1
Voltage - Input Offset (mV)	2.5	2.5	0.5	0.5	0.5	0.5
Current - Supply (mA)	8.5	8.5	5.3	8	8	8
Current - Output / Channel (mA)	100	100	32	26	26	26
Voltage - Supply Span (Min - Max) (V)	9 - 32	9 - 32	9 - 36	10 - 30	10 - 30	10 - 30
Operating Temperature (°C)	-40 to 85	-40 to 85	0 to 70	0 to 70	0 to 70	0 to 70
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)
Packaging Type	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel	Bulk	Tube	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: THS4051IDR

The THS4051IDR is the direct functional equivalent of the THS4051IDRG4. Both devices share identical electrical specifications, including 240V/µs slew rate, 70 MHz bandwidth, and 100mA output current capability. The THS4051IDR maintains active product status with 5143 units in stock, ensuring supply continuity. Both parts are ROHS3 compliant with MSL Level 1 rating. The primary distinction is packaging format: THS4051IDR is supplied in Cut Tape and Digi-Reel formats, whereas THS4051IDRG4 was supplied in alternative packaging. This substitution requires no circuit redesign.

Secondary Recommendation: LT1220CS8#TRPBF or LT1220CS8#PBF

The LT1220CS8 series (Analog Devices Inc.) provides functional substitution with trade-offs in performance and compliance. These devices maintain the 8-SOIC package, surface mount configuration, and single-circuit topology. The LT1220CS8#TRPBF and LT1220CS8#PBF variants are ROHS3 compliant with active product status. However, electrical performance differs: slew rate is 250V/µs (exceeds requirement), but bandwidth is 45 MHz (below the 70 MHz specification), and output current is 26mA (below the 100mA requirement). Input bias current is 100nA (superior to 2.5µA specification). Supply voltage range is 10V to 30V (narrower than 9V to 32V). These substitutes are suitable only for applications where reduced bandwidth and output current are acceptable.

Not Recommended: AD847JRZ-REEL7

The AD847JRZ-REEL7 (Analog Devices Inc.) does not meet substitution criteria. Although it provides 300V/µs slew rate and maintains the 8-SOIC package, the output current capability is 32mA, significantly below the 100mA requirement. The -3dB bandwidth is 50 MHz, below the 70 MHz specification. Operating temperature range is 0°C to 70°C, which does not cover the -40°C lower limit. These limitations make this device unsuitable for direct substitution.

Not Recommended: LT1220CS8 (Bulk)

The LT1220CS8 in bulk packaging is RoHS non-compliant and carries obsolete product status. This variant does not meet current regulatory requirements and supply reliability cannot be assured.

Frequently Asked Questions (FAQ)

Q: Can THS4051IDR directly replace THS4051IDRG4 without circuit modification?

A: Yes. The THS4051IDR is electrically and functionally identical to the THS4051IDRG4. Both devices feature 240V/µs slew rate, 70 MHz bandwidth, 100mA output current, and identical supply voltage range (9V to 32V). The only difference is packaging format. No circuit redesign is required.

Q: What is the key difference between THS4051IDRG4 and LT1220CS8#TRPBF?

A: The primary differences are bandwidth and output current. The THS4051IDRG4 provides 70 MHz bandwidth and 100mA output current, while the LT1220CS8#TRPBF provides 45 MHz bandwidth and 26mA output current. The LT1220CS8#TRPBF is suitable only for applications with lower bandwidth and current requirements. Additionally, the supply voltage range differs: THS4051IDRG4 operates from 9V to 32V, while LT1220CS8#TRPBF operates from 10V to 30V.

Q: Why is AD847JRZ-REEL7 not recommended as a substitute?

A: The AD847JRZ-REEL7 has insufficient output current (32mA versus 100mA required) and lower bandwidth (50 MHz versus 70 MHz required). Additionally, its operating temperature range (0°C to 70°C) does not extend to the -40°C lower limit of the THS4051IDRG4. These limitations make it unsuitable for direct substitution in applications requiring the full performance envelope of the original device.

Q: Are all recommended substitutes ROHS3 compliant?

A: The THS4051IDR, LT1220CS8#TRPBF, and LT1220CS8#PBF are all ROHS3 compliant. The LT1220CS8 in bulk packaging is RoHS non-compliant and should not be used in new designs or applications requiring regulatory compliance.

Q: What packaging options are available for the THS4051IDR?

A: The THS4051IDR is supplied in Cut Tape (CT) and Digi-Reel® formats. The LT1220CS8 series is available in Bulk (LT1220CS8), Tube (LT1220CS8#PBF), and Tape & Reel (LT1220CS8#TRPBF) formats. Packaging selection depends on production volume and assembly requirements.

Q: Can LT1220CS8 variants be used in applications requiring -40°C operation?

A: No. The LT1220CS8 series has an operating temperature range of 0°C to 70°C and cannot be used in applications requiring -40°C operation. The THS4051IDR maintains the full -40°C to 85°C operating range of the original THS4051IDRG4.

Q: What is the moisture sensitivity level (MSL) for all recommended substitutes?

A: The THS4051IDR, LT1220CS8#TRPBF, and LT1220CS8#PBF all have MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. The LT1220CS8 in bulk packaging does not specify MSL rating.

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