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LT1124CS8#TR Equivalent & Substitute Parts
Part Overview
The LT1124CS8#TR is a general purpose operational amplifier manufactured by Analog Devices Inc., featuring dual circuits in an 8-SOIC surface mount package. This device is classified as an active product and is designed for applications requiring low input bias current and moderate bandwidth performance. The LT1124CS8#TR operates across a wide supply voltage range of 8V to 44V, making it suitable for diverse analog signal processing applications.
Equivalent and substitute parts are identified based on matching electrical performance parameters, mechanical compatibility, and functional equivalence within the general purpose amplifier category. Substitution becomes necessary when the primary part number is unavailable, when alternative packaging formats are required, or when design requirements permit operation with comparable performance characteristics.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 2 | — |
| Slew Rate | 4.5 | V/µs |
| Gain Bandwidth Product | 12.5 | MHz |
| Current - Input Bias | 7 | nA |
| Voltage - Input Offset | 25 | µV |
| Current - Supply (x2 Channels) | 2.3 | mA |
| Voltage - Supply Span (Min) | 8 | V |
| Voltage - Supply Span (Max) | 44 | V |
| Operating Temperature | 0 to 70 | °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
Substitute parts for the LT1124CS8#TR are identified through strict alignment with the following electrical and mechanical criteria:
Primary Substitution Criteria:
- Dual-circuit operational amplifier configuration (2 circuits minimum)
- 8-SOIC surface mount package with 0.154" width (3.90mm)
- Supply voltage range compatibility: minimum 8V, maximum 44V or greater
- General purpose amplifier classification
- ROHS3 compliance and MSL rating of 1 or 2
Secondary Compatibility Parameters:
- Slew rate of 4.5V/µs or greater
- Gain bandwidth product of 12.5 MHz or greater
- Input bias current of 7 nA or lower
- Input offset voltage of 25 µV or lower
- Supply current of 2.3 mA per channel or lower
Substitutes are grouped into two categories: direct packaging equivalents (identical part number with different packaging designation) and functional equivalents (different manufacturers or amplifier topologies meeting or exceeding electrical specifications).
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (µV) | Supply Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LT1124CS8#TR | Analog Devices Inc. | General Purpose | 4.5 | 12.5 | 7 | 25 | 2.3 | 8 | 44 | 0 to 70 | Active |
| LT1124CS8#TRPBF | Analog Devices Inc. | General Purpose | 4.5 | 12.5 | 7 | 25 | 2.3 | 8 | 44 | 0 to 70 | Active |
| ISL28227FBZ | Renesas Electronics Corporation | General Purpose | 3.6 | 10 | 1 | 10 | 2.2 | 4.5 | 40 | -40 to 125 | Active |
| ISL28227FBZ-T7A | Renesas Electronics Corporation | General Purpose | 3.6 | 10 | 1 | 10 | 2.2 | 4.5 | 40 | -40 to 125 | Obsolete |
| MC4558CDT | STMicroelectronics | General Purpose | 2.2 | 5.5 | 50 | 1000 | 2.3 | 4 | 40 | 0 to 70 | Active |
| MC4558IDT | STMicroelectronics | General Purpose | 2.2 | 5.5 | 50 | 1000 | 2.3 | 4 | 40 | -40 to 105 | Active |
| ADA4000-2ARZ | Analog Devices Inc. | J-FET | 20 | 5 | 0.005 | 200 | 1.35 | 8 | 36 | -40 to 125 | Active |
| ADA4000-2ARZ-R7 | Analog Devices Inc. | J-FET | 20 | 5 | 0.005 | 200 | 1.35 | 8 | 36 | -40 to 125 | Active |
| ADA4000-2ARZ-RL | Analog Devices Inc. | J-FET | 20 | 5 | 0.005 | 200 | 1.35 | 8 | 36 | -40 to 125 | Active |
| LME49860MAX/NOPB | Texas Instruments | Audio | 20 | 55 | 10 | 140 | 10.5 | 5 | 44 | -40 to 85 | Active |
| MC1458DT | STMicroelectronics | General Purpose | 0.8 | 1 | 30 | 1000 | 2.3 | 5 | 30 | 0 to 70 | Active |
Engineering Selection Recommendations
Direct Equivalent (Packaging Variant):
The LT1124CS8#TRPBF is an identical electrical equivalent to the LT1124CS8#TR, differing only in packaging format (Tape & Reel designation). This part maintains all electrical specifications and is suitable for direct substitution when tape and reel packaging is required for automated assembly processes. Both parts are manufactured by Analog Devices Inc., carry Active product status, and maintain ROHS3 compliance with MSL rating of 1.
General Purpose Amplifier Substitutes (Active Status):
The ISL28227FBZ manufactured by Renesas Electronics Corporation meets or exceeds the electrical performance requirements of the LT1124CS8#TR. This part features superior input bias current (1 nA versus 7 nA), lower input offset voltage (10 µV versus 25 µV), and extended operating temperature range (-40°C to 125°C). The ISL28227FBZ operates across a lower minimum supply voltage (4.5V) and maintains compatibility with the 8-SOIC package format. This part is Active and ROHS3 compliant.
The MC4558CDT and MC4558IDT manufactured by STMicroelectronics are general purpose dual-circuit amplifiers in 8-SOIC packages. These parts operate within compatible supply voltage ranges (4V to 40V) and maintain equivalent supply current specifications. The MC4558IDT extends the operating temperature range to -40°C to 105°C. Both parts are Active and ROHS3 compliant. Note that these parts exhibit lower slew rate (2.2V/µs) and gain bandwidth product (5.5 MHz) compared to the LT1124CS8#TR.
Specialized Topology Alternatives:
The ADA4000-2ARZ, ADA4000-2ARZ-R7, and ADA4000-2ARZ-RL are J-FET input amplifiers manufactured by Analog Devices Inc. These parts feature extremely low input bias current (5 pA) and higher slew rate (20V/µs), suitable for applications requiring ultra-low input current. However, these parts operate with a reduced maximum supply voltage (36V versus 44V) and lower gain bandwidth product (5 MHz). All three variants are Active and ROHS3 compliant with extended temperature range (-40°C to 125°C).
The LME49860MAX/NOPB is an audio-grade amplifier manufactured by Texas Instruments with significantly higher gain bandwidth product (55 MHz) and slew rate (20V/µs). This part is suitable for high-fidelity audio applications but exhibits higher supply current (10.5 mA) and is classified as an Audio amplifier rather than general purpose. The part is Active and ROHS3 compliant.
Parts Not Recommended for Direct Substitution:
The MC1458DT exhibits performance characteristics below the LT1124CS8#TR specification, including lower slew rate (0.8V/µs), lower gain bandwidth product (1 MHz), and higher input bias current (30 nA). This part is suitable only for legacy applications with relaxed performance requirements.
The ISL28227FBZ-T7A carries Obsolete product status and should not be selected for new designs despite meeting electrical specifications.
Frequently Asked Questions (FAQ)
Q: Can the LT1124CS8#TRPBF be used as a direct replacement for the LT1124CS8#TR?
A: Yes. The LT1124CS8#TRPBF is electrically identical to the LT1124CS8#TR. The difference is packaging format: the TRPBF designation indicates Tape & Reel packaging, while the TR designation indicates standard reel packaging. Both parts are manufactured by Analog Devices Inc. and carry identical electrical specifications. Selection between these variants depends on assembly process requirements.
Q: What is the primary difference between the LT1124CS8#TR and the ISL28227FBZ?
A: Both are general purpose dual-circuit amplifiers in 8-SOIC packages with compatible supply voltage ranges. The ISL28227FBZ offers superior input bias current (1 nA versus 7 nA) and lower input offset voltage (10 µV versus 25 µV). The LT1124CS8#TR provides higher slew rate (4.5V/µs versus 3.6V/µs) and higher gain bandwidth product (12.5 MHz versus 10 MHz). The ISL28227FBZ supports extended operating temperature range (-40°C to 125°C versus 0°C to 70°C) and lower minimum supply voltage (4.5V versus 8V).
Q: Are the MC4558CDT and MC4558IDT suitable replacements for the LT1124CS8#TR?
A: The MC4558CDT and MC4558IDT are functionally compatible general purpose dual-circuit amplifiers in 8-SOIC packages. Both operate within the supply voltage range of the LT1124CS8#TR and maintain equivalent supply current specifications. However, these parts exhibit lower slew rate (2.2V/µs versus 4.5V/µs) and lower gain bandwidth product (5.5 MHz versus 12.5 MHz). Selection of these parts is appropriate for applications where the lower performance specifications are acceptable. The MC4558IDT provides extended operating temperature range (-40°C to 105°C).
Q: Why is the ADA4000-2ARZ listed as a substitute despite different amplifier topology?
A: The ADA4000-2ARZ is a J-FET input amplifier offering extremely low input bias current (5 pA) and higher slew rate (20V/µs), making it suitable for applications requiring ultra-low input current performance. However, this part operates with reduced maximum supply voltage (36V versus 44V) and lower gain bandwidth product (5 MHz). The ADA4000-2ARZ is appropriate only for applications where the J-FET input characteristics provide functional advantage over the general purpose topology of the LT1124CS8#TR.
Q: What does the ISL28227FBZ-T7A Obsolete status mean for design purposes?
A: Obsolete product status indicates that the manufacturer has discontinued production and support for this part. The ISL28227FBZ-T7A should not be selected for new designs. The active equivalent is the ISL28227FBZ, which maintains identical electrical specifications and is currently in production.
Q: Can the LME49860MAX/NOPB replace the LT1124CS8#TR in general purpose applications?
A: The LME49860MAX/NOPB is classified as an audio-grade amplifier and is not recommended as a general purpose replacement. While this part offers superior gain bandwidth product (55 MHz) and slew rate (20V/µs), it exhibits significantly higher supply current (10.5 mA versus 2.3 mA), which may impact power budget and thermal design. Selection of the LME49860MAX/NOPB is appropriate only for audio applications where the enhanced bandwidth and slew rate characteristics provide functional advantage.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed in this reference carry ROHS3 compliance certification. The LT1124CS8#TR and all identified substitutes meet ROHS3 requirements and are suitable for applications with RoHS compliance mandates.
Q: What is the significance of Moisture Sensitivity Level (MSL) ratings in part selection?
A: The LT1124CS8#TR carries MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling. The ISL28227FBZ and ISL28227FBZ-T7A carry MSL rating of 2 (1 Year), requiring controlled storage conditions. All other substitutes carry MSL rating of 1. MSL rating affects storage requirements, shelf life, and handling procedures during assembly. Parts with MSL 1 rating offer greater flexibility in inventory management.
Q: Can multiple substitute parts be used interchangeably within a single design?
A: No. While multiple substitutes are listed, each part exhibits different electrical characteristics. A design must be qualified for the specific part number selected. Interchanging parts within a design without re-qualification may result in performance degradation or functional failure. Each substitute should be evaluated against the specific application requirements before selection.
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