THS3111CDG4 Equivalent & Substitute Parts

Part Overview

The THS3111CDG4 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, delivering high-speed signal processing capabilities with a slew rate of 1300V/µs and -3dB bandwidth of 100 MHz. The THS3111CDG4 is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value
Amplifier Type	Current Feedback
Number of Circuits	1
Slew Rate	1300V/µs
-3dB Bandwidth	100 MHz
Current - Input Bias	1.5 µA
Voltage - Input Offset	3 mV
Current - Supply	4.8 mA
Current - Output / Channel	260 mA
Voltage - Supply Span (Min)	10 V
Voltage - Supply Span (Max)	30 V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the THS3111CDG4 is determined by strict equivalence across the following critical parameters: amplifier type (current feedback), number of circuits (1), package type (8-SOIC surface mount), and electrical compatibility within the specified supply voltage range and operating temperature window.

The substitute parts are grouped into two categories based on product status and availability:

Primary Substitute (Direct Replacement): THS3111CD maintains identical electrical specifications and packaging, differing only in product status (Active vs. Discontinued) and packaging format (Tube vs. standard).

Secondary Substitutes (Functional Equivalents): LT1228CS8#PBF, LT1228CS8#TRPBF, and LT1228IS8#PBF are current feedback amplifiers with the same package type and single-circuit configuration. These devices operate within compatible supply voltage ranges and maintain the same -3dB bandwidth of 100 MHz. The LT1252CS8#PBF is a video amplifier variant with higher bandwidth (282 MHz) and different slew rate characteristics, suitable for applications requiring extended frequency response.

Substitution eligibility is based on: matching amplifier topology, identical circuit count, compatible package dimensions, overlapping supply voltage specifications, and compliance certifications (ROHS3, REACH Unaffected, EAR99).

Parameter Comparison

Parameter	THS3111CDG4	THS3111CD	LT1228CS8#PBF	LT1228CS8#TRPBF	LT1228IS8#PBF	LT1252CS8#PBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	Current Feedback	Current Feedback	Current Feedback	Current Feedback	Current Feedback	Current Feedback
Number of Circuits	1	1	1	1	1	1
Slew Rate	1300V/µs	1300V/µs	3500V/µs	3500V/µs	3500V/µs	125V/µs
-3dB Bandwidth	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	282 MHz
Current - Input Bias	1.5 µA	1.5 µA	10 µA	10 µA	10 µA	Not Specified
Voltage - Input Offset	3 mV	3 mV	3 mV	3 mV	3 mV	Not Specified
Current - Supply	4.8 mA	4.8 mA	6 mA	6 mA	6 mA	8.5 mA
Current - Output / Channel	260 mA	260 mA	125 mA	125 mA	125 mA	55 mA
Voltage - Supply Span (Min)	10 V	10 V	4 V	4 V	4 V	4 V (Single) / ±2 V (Dual)
Voltage - Supply Span (Max)	30 V	30 V	36 V	36 V	36 V	28 V (Single) / ±14 V (Dual)
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	Not Specified
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Discontinued	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

THS3111CD is the recommended primary substitute for the THS3111CDG4. This part maintains complete electrical and functional equivalence with identical specifications across all critical parameters. The device is currently in Active product status with robust inventory availability (2160 units), ensuring long-term procurement reliability. Both devices are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for industrial and commercial applications.

LT1228CS8#PBF and LT1228CS8#TRPBF (Analog Devices Inc.) are functionally compatible alternatives. These devices operate within the THS3111CDG4 supply voltage envelope (4V to 36V exceeds the 10V to 30V requirement) and maintain the same -3dB bandwidth specification. The higher slew rate (3500V/µs vs. 1300V/µs) provides enhanced transient response capability. The primary trade-off is reduced output current per channel (125 mA vs. 260 mA). These parts are suitable for applications where output current requirements do not exceed 125 mA. LT1228CS8#TRPBF is supplied in Tape & Reel format, while LT1228CS8#PBF is supplied in Tube format.

LT1228IS8#PBF (Analog Devices Inc.) extends the operating temperature range to -40°C to 85°C, accommodating extended industrial temperature specifications. This variant is identical to LT1228CS8#PBF in electrical performance and packaging, with significantly higher inventory availability (27,870 units). Selection of this part is appropriate for applications requiring wider temperature operation.

LT1252CS8#PBF is a video amplifier variant with substantially higher bandwidth (282 MHz) and lower slew rate (125V/µs). This device is suitable only for applications requiring extended frequency response beyond 100 MHz. The reduced output current (55 mA) and different slew rate characteristics make this part unsuitable as a direct replacement for general-purpose current feedback amplifier applications.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and EAR99 export classification, ensuring regulatory and supply chain compatibility with the original THS3111CDG4.

Frequently Asked Questions (FAQ)

Q: Can THS3111CD be used as a direct replacement for THS3111CDG4?

A: Yes. THS3111CD is electrically and functionally identical to THS3111CDG4. Both devices share identical specifications for slew rate (1300V/µs), bandwidth (100 MHz), supply voltage range (10V to 30V), and all other critical parameters. The only differences are product status (Active vs. Discontinued) and packaging format (Tube vs. standard). THS3111CD is the recommended substitute.

Q: What are the key differences between THS3111CDG4 and the LT1228 series?

A: The LT1228 series (LT1228CS8#PBF, LT1228CS8#TRPBF, LT1228IS8#PBF) maintains the same -3dB bandwidth (100 MHz) and package type (8-SOIC) as the THS3111CDG4. However, the LT1228 devices feature a higher slew rate (3500V/µs vs. 1300V/µs) and reduced output current per channel (125 mA vs. 260 mA). The supply voltage range is also wider (4V to 36V vs. 10V to 30V). These differences make the LT1228 series suitable for applications where higher slew rate is beneficial and output current requirements do not exceed 125 mA.

Q: Is the LT1252CS8#PBF a suitable substitute for THS3111CDG4?

A: LT1252CS8#PBF is not recommended as a direct substitute. While it maintains the same package type and current feedback topology, it is optimized for video applications with significantly higher bandwidth (282 MHz) and lower slew rate (125V/µs). The reduced output current (55 mA) and different frequency response characteristics make it unsuitable for general-purpose current feedback amplifier applications matching the THS3111CDG4 specification.

Q: What is the difference between LT1228CS8#PBF and LT1228CS8#TRPBF?

A: Both parts are electrically identical. The primary difference is packaging format: LT1228CS8#PBF is supplied in Tube format, while LT1228CS8#TRPBF is supplied in Tape & Reel (TR) format. Selection between these variants depends on assembly process requirements and procurement preferences. Tape & Reel format is typically preferred for automated pick-and-place assembly operations.

Q: Should I select LT1228IS8#PBF over LT1228CS8#PBF?

A: LT1228IS8#PBF is appropriate if your application requires extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C). Both devices are electrically identical in all other specifications. LT1228IS8#PBF also offers significantly higher inventory availability (27,870 units), which may provide procurement advantages. If your application operates within the 0°C to 70°C range, either part is suitable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (THS3111CD, LT1228CS8#PBF, LT1228CS8#TRPBF, LT1228IS8#PBF, and LT1252CS8#PBF) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts are REACH unaffected and classified as EAR99 for export purposes, ensuring regulatory compatibility with the original THS3111CDG4.

Q: What is the impact of different output current ratings on circuit design?

A: The THS3111CDG4 provides 260 mA output current per channel, while the LT1228 series provides 125 mA. If your circuit design requires output current exceeding 125 mA, the LT1228 series cannot be used as a substitute. Verify your circuit's maximum output current requirement before selecting an alternative part. The LT1252CS8#PBF provides only 55 mA output current and is unsuitable for applications requiring higher output drive capability.

Q: Can I use LT1228 devices in applications designed for THS3111CDG4 if I adjust the supply voltage?

A: The LT1228 series operates across a wider supply voltage range (4V to 36V) compared to the THS3111CDG4 (10V to 30V). However, substitution requires that all other electrical parameters remain compatible. The reduced output current (125 mA vs. 260 mA) and higher slew rate (3500V/µs vs. 1300V/µs) may affect circuit performance. Verify that your application can tolerate these parameter differences before implementing a substitution based solely on supply voltage compatibility.

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