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THS3111IDR Equivalent & Substitute Parts
Part Overview
The THS3111IDR is an active, single-circuit current feedback amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device operates across a 10V to 30V supply span with a 1300V/µs slew rate and 100 MHz bandwidth, designed for high-speed signal conditioning applications. Substitute parts are identified to address inventory availability, packaging format preferences, or specific application requirements while maintaining functional compatibility within defined electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | Current Feedback | — |
| Number of Circuits | 1 | — |
| Slew Rate | 1300 | V/µs |
| -3dB Bandwidth | 100 | MHz |
| Voltage - Input Offset | 3 | mV |
| Voltage - Supply Span (Min) | 10 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution eligibility for the THS3111IDR is determined by the following criteria:
Mandatory Compatibility Parameters:
- Amplifier Type: Current Feedback
- Number of Circuits: 1
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
Functional Performance Parameters:
- -3dB Bandwidth: 100 MHz (minimum requirement)
- Voltage - Input Offset: 3 mV (maximum tolerance)
- Voltage - Supply Span compatibility with 10V to 30V operating range
Application Constraints:
- Operating Temperature Range: Substitute must support -40°C to 85°C or equivalent industrial range
- Product Status: Active
The substitute parts listed below meet all mandatory compatibility parameters. Variations in slew rate, current consumption, and output current capability are permitted when the substitute maintains or exceeds the primary functional specifications and operates within the defined supply voltage and temperature ranges.
Parameter Comparison
| Parameter | THS3111IDR | LT1228CS8#PBF | LT1228CS8#TRPBF | LT1228IS8#PBF | LT1252CS8#PBF |
|---|---|---|---|---|---|
| Manufacturer | 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 |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 |
| Slew Rate (V/µs) | 1300 | 3500 | 3500 | 3500 | 125 |
| -3dB Bandwidth (MHz) | 100 | 100 | 100 | 100 | 282 |
| Voltage - Input Offset (mV) | 3 | 3 | 3 | 3 | — |
| Current - Supply (mA) | 4.8 | 6 | 6 | 6 | 8.5 |
| Current - Output / Channel (mA) | 260 | — | 125 | 125 | 55 |
| Voltage - Supply Span (Min) | 10 V | 4 V | 4 V | 4 V | 4 V (single) / ±2 V (dual) |
| Voltage - Supply Span (Max) | 30 V | 36 V | 36 V | 36 V | 28 V (single) / ±14 V (dual) |
| Operating Temperature (°C) | -40 to 85 | 0 to 70 | 0 to 70 | -40 to 85 | — |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Packaging Format | Tape & Reel (TR) | Tube | Tape & Reel (TR) | Tube | Tube |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
LT1228IS8#PBF is the primary substitute for the THS3111IDR when operating temperature range compatibility is critical. This part maintains the full -40°C to 85°C operating range of the original device, ensuring functional equivalence across all specified environmental conditions. Both devices are ROHS3 compliant and active products. The LT1228IS8#PBF operates within the 10V to 30V supply span of the THS3111IDR and provides 100 MHz bandwidth with 3 mV input offset voltage matching.
LT1228CS8#TRPBF is the recommended substitute when Tape & Reel packaging format is required to match the original THS3111IDR packaging specification. This part provides identical electrical performance to LT1228IS8#PBF but is constrained to 0°C to 70°C operating temperature. Selection of this part requires verification that the application does not require operation below 0°C.
LT1228CS8#PBF is suitable for applications where Tube packaging is acceptable and operating temperature does not extend below 0°C. This part shares electrical specifications with LT1228CS8#TRPBF and provides equivalent performance within its temperature range.
LT1252CS8#PBF is a substitute only for applications requiring higher bandwidth (282 MHz) than the original specification. This part operates at reduced slew rate (125V/µs) and lower output current (55 mA) compared to the THS3111IDR. Selection requires confirmation that the application can operate within these modified performance parameters.
All substitute parts are ROHS3 compliant, active products with unlimited moisture sensitivity level (MSL 1) and REACH unaffected status, matching the regulatory compliance profile of the THS3111IDR.
Frequently Asked Questions (FAQ)
Q: Can the LT1228CS8#PBF be used as a direct replacement for the THS3111IDR in all applications?
A: The LT1228CS8#PBF is electrically compatible within the 10V to 30V supply range and matches the 100 MHz bandwidth and 3 mV input offset specifications. However, this part is rated for 0°C to 70°C operation, whereas the THS3111IDR operates from -40°C to 85°C. Applications requiring operation below 0°C or above 70°C must use LT1228IS8#PBF instead.
Q: What is the difference between LT1228CS8#PBF and LT1228CS8#TRPBF?
A: These parts are electrically identical. The primary difference is packaging format: LT1228CS8#PBF is supplied in Tube packaging, while LT1228CS8#TRPBF is supplied in Tape & Reel (TR) format. Both are constrained to 0°C to 70°C operating temperature. Selection depends on manufacturing process requirements and inventory handling procedures.
Q: Is the LT1252CS8#PBF a suitable substitute for high-speed applications?
A: The LT1252CS8#PBF provides 282 MHz bandwidth, exceeding the THS3111IDR specification of 100 MHz. However, this part operates at 125V/µs slew rate, significantly lower than the THS3111IDR's 1300V/µs. Additionally, output current is limited to 55 mA compared to 260 mA for the original device. This part is suitable only for applications where higher bandwidth is required and lower slew rate and output current are acceptable.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts (LT1228CS8#PBF, LT1228CS8#TRPBF, LT1228IS8#PBF, and LT1252CS8#PBF) are ROHS3 compliant, matching the regulatory status of the THS3111IDR.
Q: What is the impact of supply voltage range differences on substitution?
A: The THS3111IDR operates from 10V to 30V. All Analog Devices substitutes operate from 4V to 36V, providing a wider supply range. When the THS3111IDR is used in applications operating at 4V to 10V or 30V to 36V, the substitute parts extend functionality. Conversely, applications strictly limited to 10V to 30V operation are fully compatible with all substitutes within this range.
Q: Which substitute part should be selected for new designs?
A: For new designs requiring -40°C to 85°C operation, LT1228IS8#PBF is the recommended selection. For designs with 0°C to 70°C temperature requirements and Tape & Reel packaging preference, LT1228CS8#TRPBF is appropriate. For applications requiring higher bandwidth performance, LT1252CS8#PBF is suitable provided slew rate and output current limitations are acceptable.
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