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LS204IDT Equivalent & Substitute Parts
Part Overview
The LS204IDT is a general purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a dual-channel amplifier in an 8-SOIC surface mount package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available through standard distribution channels. Identifying equivalent and substitute parts is necessary to maintain design continuity, support legacy system repairs, and ensure component availability for production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LS204IDT |
| Manufacturer | STMicroelectronics |
| Category | Linear, Amplifiers |
| Amplifier Type | General Purpose |
| Number of Circuits | 2 |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Slew Rate | 1.5V/µs |
| Gain Bandwidth Product | 3 MHz |
| Current - Input Bias | 50 nA |
| Voltage - Input Offset | 500 µV |
| Current - Supply | 700µA |
| Current - Output / Channel | 23 mA |
| Voltage - Supply Span (Min) | 6 V |
| Voltage - Supply Span (Max) | 30 V |
| Operating Temperature | -40°C ~ 105°C |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LS204IDT is determined by the following critical parameters:
Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing printed circuit board layouts.
Circuit Configuration: The LS204IDT contains 2 operational amplifier circuits. Substitute parts must maintain this dual-channel configuration.
Electrical Performance Envelope: Substitute parts must operate within the supply voltage range of 6V to 30V minimum and maximum specifications. The slew rate of 1.5V/µs and gain bandwidth product of 3 MHz define the performance class of the original device.
Amplifier Type Classification: The LS204IDT is classified as a general purpose amplifier. Substitute parts may include both general purpose and J-FET amplifier types, provided they meet the electrical performance requirements and package specifications.
Compliance and Certification: All substitute parts must maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating to ensure regulatory and manufacturing process compatibility.
Parameter Comparison
| Parameter | LS204IDT | AD648JRZ | AD648KRZ | AD706ARZ | AD706JRZ |
|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Amplifier Type | General Purpose | J-FET | J-FET | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Slew Rate | 1.5V/µs | 1.8V/µs | 1.8V/µs | 0.15V/µs | 0.15V/µs |
| Gain Bandwidth Product | 3 MHz | 1 MHz | 1 MHz | 800 kHz | 800 kHz |
| Current - Input Bias | 50 nA | 5 pA | 3 pA | 50 pA | 50 pA |
| Voltage - Input Offset | 500 µV | 750 µV | 300 µV | 30 µV | 30 µV |
| Current - Supply | 700µA | 340µA (x2 Channels) | 340µA (x2 Channels) | 750µA | 750µA |
| Current - Output / Channel | 23 mA | 15 mA | 15 mA | 15 mA | 15 mA |
| Voltage - Supply Span (Min) | 6 V | 9 V | 9 V | 4 V | 4 V |
| Voltage - Supply Span (Max) | 30 V | 36 V | 36 V | 36 V | 36 V |
| Operating Temperature | -40°C ~ 105°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | 0°C ~ 70°C |
| Product Status | Obsolete | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
AD706 Series (AD706ARZ, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ, AD706JRZ-REEL, AD706JRZ-REEL7): These general purpose amplifiers from Analog Devices maintain the same amplifier type classification as the LS204IDT. All variants are in active product status with ROHS3 compliance and MSL 1 rating. The AD706 series operates within the supply voltage range of 4V to 36V, which encompasses the LS204IDT specification of 6V to 30V. These parts are suitable for applications where the lower slew rate (0.15V/µs) and reduced gain bandwidth product (800 kHz) are acceptable compared to the original specification.
AD648 Series (AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, AD648KRZ): These J-FET amplifiers from Analog Devices provide an alternative amplifier type with superior input bias current characteristics (5 pA to 3 pA versus 50 nA). All variants are in active product status with ROHS3 compliance and MSL 1 rating. The AD648 series operates within the supply voltage range of 9V to 36V. The minimum supply voltage of 9V exceeds the LS204IDT minimum of 6V, requiring verification that application supply voltages meet this requirement. The slew rate of 1.8V/µs exceeds the original specification, while the gain bandwidth product of 1 MHz is lower than the LS204IDT specification of 3 MHz.
Packaging Variants: Substitute parts are available in multiple packaging formats including Tube, Cut Tape (CT), and Cut Tape with Digi-Reel (CT & Digi-Reel). Selection of packaging variant depends on procurement and assembly process requirements. All packaging variants maintain identical electrical specifications and 8-SOIC package dimensions.
Temperature Range Considerations: The LS204IDT operates from -40°C to 105°C. The AD706 series with -40°C to 85°C rating provides reduced upper temperature coverage. The AD648 series with 0°C to 70°C rating provides further reduced temperature coverage. Applications requiring the full -40°C to 105°C range must evaluate whether the reduced upper temperature limit of substitute parts is acceptable.
Frequently Asked Questions (FAQ)
Q: Can the AD706 series directly replace the LS204IDT in all applications?
A: The AD706 series shares the same general purpose amplifier classification, dual-channel configuration, and 8-SOIC package as the LS204IDT. However, the AD706 series has a lower slew rate (0.15V/µs versus 1.5V/µs) and lower gain bandwidth product (800 kHz versus 3 MHz). Applications sensitive to these performance parameters require circuit analysis to confirm compatibility. The AD706 series also has a reduced upper operating temperature limit of 85°C compared to the LS204IDT specification of 105°C.
Q: What is the difference between AD648JRZ and AD648KRZ?
A: Both parts are J-FET amplifiers with identical electrical performance except for input offset voltage and input bias current specifications. The AD648KRZ provides superior input offset voltage (300 µV versus 750 µV) and lower input bias current (3 pA versus 5 pA). Selection between these variants depends on application requirements for input offset voltage and bias current performance.
Q: Are all AD706 packaging variants electrically identical?
A: Yes. The AD706ARZ, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ, AD706JRZ-REEL, and AD706JRZ-REEL7 variants maintain identical electrical specifications. Packaging variants differ only in delivery format (Tube, Cut Tape, or Cut Tape with Digi-Reel). Selection of packaging variant is determined by procurement and assembly process requirements.
Q: What is the minimum supply voltage requirement for AD648 series substitution?
A: The AD648 series specifies a minimum supply voltage of 9V, compared to the LS204IDT minimum of 6V. Applications operating at supply voltages between 6V and 9V cannot use the AD648 series without circuit modification. Applications with supply voltages of 9V or higher are compatible with the AD648 series minimum supply voltage specification.
Q: Are substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed (AD648 and AD706 series) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the LS204IDT.
Q: Can the AD648 J-FET amplifier replace the LS204IDT general purpose amplifier?
A: The AD648 series provides an alternative amplifier type with different electrical characteristics. The J-FET input stage provides significantly lower input bias current (5 pA to 3 pA versus 50 nA) but higher input offset voltage (300 µV to 750 µV versus 500 µV). The AD648 series has a lower gain bandwidth product (1 MHz versus 3 MHz) and higher minimum supply voltage requirement (9V versus 6V). Substitution is possible only when application requirements are compatible with these electrical differences.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in three packaging formats: Tube (standard packaging), Cut Tape (CT), and Cut Tape with Digi-Reel (CT & Digi-Reel). All packaging variants use the identical 8-SOIC (0.154", 3.90mm Width) surface mount package. Packaging selection is determined by procurement quantity, assembly process compatibility, and inventory management requirements.
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