Request Quote
(Ships tomorrow)
LS204CDT Equivalent & Substitute Parts
Part Overview
The LS204CDT 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 discontinued production and limited availability for new designs. The identification of equivalent and substitute parts is necessary to support ongoing maintenance, repair, and legacy system support where the original component is no longer procurable through standard distribution channels.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LS204CDT |
| 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 V/µs |
| Gain Bandwidth Product | 2.5 MHz |
| Current - Input Bias | 100 nA |
| Voltage - Input Offset | 500 µV |
| Current - Supply | 800 µA |
| Current - Output / Channel | 23 mA |
| Voltage - Supply Span (Min) | 6 V |
| Voltage - Supply Span (Max) | 30 V |
| Operating Temperature | 0°C ~ 70°C |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LS204CDT is determined by strict alignment of electrical and mechanical parameters within the operational amplifier category. The critical substitution criteria are:
Mechanical Compatibility:
- Package type: 8-SOIC (0.154", 3.90mm Width)
- Mounting type: Surface Mount
- Pin count and footprint equivalence
Electrical Compatibility:
- Number of circuits: 2 (dual-channel configuration)
- Amplifier type classification
- Supply voltage range overlap with LS204CDT (6 V to 30 V minimum and maximum)
- Operating temperature range compatibility (0°C ~ 70°C minimum)
- Slew rate, gain bandwidth product, and output current specifications
Regulatory Compliance:
- RoHS3 compliance
- MSL rating of 1 (Unlimited)
Substitute parts are grouped into two categories based on amplifier type: General Purpose amplifiers (AD706 series) and J-FET amplifiers (AD648 series). Both categories meet the mechanical and regulatory requirements. General Purpose substitutes maintain the same amplifier classification as the LS204CDT. J-FET substitutes offer alternative input characteristics with significantly lower input bias current.
Parameter Comparison
| Parameter | LS204CDT | AD648JRZ | AD648JRZ-REEL | AD648JRZ-REEL7 | AD648KRZ | AD706ARZ | AD706ARZ-REEL | AD706ARZ-REEL7 | AD706JRZ | AD706JRZ-REEL | AD706JRZ-REEL7 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Amplifier Type | General Purpose | J-FET | J-FET | J-FET | J-FET | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 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 | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Slew Rate | 1 V/µs | 1.8 V/µs | 1.8 V/µs | 1.8 V/µs | 1.8 V/µs | 0.15 V/µs | 0.15 V/µs | 0.15 V/µs | 0.15 V/µs | 0.15 V/µs | 0.15 V/µs |
| Gain Bandwidth Product | 2.5 MHz | 1 MHz | 1 MHz | 1 MHz | 1 MHz | 800 kHz | 800 kHz | 800 kHz | 800 kHz | 800 kHz | 800 kHz |
| Current - Input Bias | 100 nA | 5 pA | 5 pA | 5 pA | 3 pA | 50 pA | 50 pA | 50 pA | 50 pA | 50 pA | 50 pA |
| Voltage - Input Offset | 500 µV | 750 µV | 750 µV | 750 µV | 300 µV | 30 µV | 30 µV | 30 µV | 30 µV | 30 µV | 30 µV |
| Current - Supply | 800 µA | 340 µA (x2 Channels) | 340 µA (x2 Channels) | 340 µA (x2 Channels) | 340 µA (x2 Channels) | 750 µA | 750 µA | 750 µA | 750 µA | 750 µA | 750 µA |
| Current - Output / Channel | 23 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA |
| Voltage - Supply Span (Min) | 6 V | 9 V | 9 V | 9 V | 9 V | 4 V | 4 V | 4 V | 4 V | 4 V | 4 V |
| Voltage - Supply Span (Max) | 30 V | 36 V | 36 V | 36 V | 36 V | 36 V | 36 V | 36 V | 36 V | 36 V | 36 V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
General Purpose Amplifier Substitutes (AD706 Series)
The AD706 series operational amplifiers are direct functional equivalents to the LS204CDT within the general purpose amplifier classification. All AD706 variants (AD706ARZ, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ, AD706JRZ-REEL, AD706JRZ-REEL7) are manufactured by Analog Devices Inc. and maintain active product status. These components are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the regulatory profile of the LS204CDT.
The AD706 series operates within the LS204CDT supply voltage range (4 V minimum to 36 V maximum), with operating temperature ranges that encompass or exceed the LS204CDT specification of 0°C to 70°C. The AD706 variants with extended temperature range (-40°C to 85°C) provide enhanced operational margin for temperature-sensitive applications.
Packaging variants within the AD706 series differ only in delivery format: tube packaging (AD706ARZ, AD706JRZ), cut tape with Digi-Reel (AD706ARZ-REEL, AD706JRZ-REEL, AD706ARZ-REEL7, AD706JRZ-REEL7). All maintain identical electrical specifications and 8-SOIC package geometry compatible with LS204CDT PCB layouts.
J-FET Amplifier Substitutes (AD648 Series)
The AD648 series operational amplifiers provide alternative substitution based on J-FET input architecture. All AD648 variants (AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, AD648KRZ) are manufactured by Analog Devices Inc. with active product status, ROHS3 compliance, and MSL rating of 1 (Unlimited).
The AD648 series operates within compatible supply voltage ranges (9 V minimum to 36 V maximum) and maintains the 0°C to 70°C operating temperature specification of the LS204CDT. The J-FET input architecture delivers significantly lower input bias current (3 pA to 5 pA) compared to the LS204CDT (100 nA), making this series suitable for high-impedance input applications.
Packaging variants within the AD648 series differ only in delivery format: tube packaging (AD648JRZ, AD648KRZ), cut tape with Digi-Reel (AD648JRZ-REEL, AD648JRZ-REEL7). All maintain identical electrical specifications and 8-SOIC package geometry.
Selection Criteria Summary
Selection between AD706 and AD648 series depends on application requirements for input bias current and offset voltage characteristics. The AD706 series offers lower input offset voltage (30 µV) and lower slew rate (0.15 V/µs), suitable for precision DC applications. The AD648 series offers lower input bias current and higher slew rate (1.8 V/µs), suitable for high-impedance and AC signal applications.
All substitute parts are currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete LS204CDT.
Frequently Asked Questions (FAQ)
Q: Can AD706 and AD648 series parts be used interchangeably with the LS204CDT?
A: Both series are mechanically and electrically compatible with the LS204CDT in terms of package footprint (8-SOIC), pin count (8 pins), and dual-channel configuration. However, electrical performance differs. The AD706 series maintains general purpose amplifier characteristics similar to the LS204CDT. The AD648 series uses J-FET input architecture with different input bias current and offset voltage specifications. Selection depends on specific application requirements for input characteristics and frequency response.
Q: What is the difference between AD706ARZ, AD706ARZ-REEL, and AD706ARZ-REEL7?
A: These part numbers represent the same electrical component with different packaging and delivery formats. AD706ARZ is supplied in tube packaging. AD706ARZ-REEL and AD706ARZ-REEL7 are supplied on cut tape with Digi-Reel format. The electrical specifications, performance characteristics, and 8-SOIC package geometry are identical across all three variants. Selection is based on procurement and assembly process requirements.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts (AD706 and AD648 series) are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the regulatory compliance of the LS204CDT.
Q: What is the minimum supply voltage requirement for AD648 series substitutes?
A: The AD648 series requires a minimum supply voltage of 9 V, compared to the LS204CDT minimum of 6 V. Applications operating at supply voltages between 6 V and 9 V cannot use AD648 series substitutes. The AD706 series operates at supply voltages as low as 4 V and is suitable for these applications.
Q: How do input bias current specifications affect circuit design?
A: The LS204CDT has input bias current of 100 nA. The AD706 series has input bias current of 50 pA, and the AD648 series has input bias current of 3 pA to 5 pA. Lower input bias current reduces errors in high-impedance input circuits and transimpedance amplifier configurations. Applications with input impedances exceeding 1 MΩ benefit from the lower input bias current of AD648 series parts.
Q: What is the significance of slew rate differences between substitute parts?
A: The LS204CDT has slew rate of 1 V/µs. The AD706 series has slew rate of 0.15 V/µs, and the AD648 series has slew rate of 1.8 V/µs. Slew rate determines the maximum rate of output voltage change. Applications requiring high-speed signal processing or large-amplitude AC signals benefit from higher slew rate. The AD648 series (1.8 V/µs) is suitable for higher frequency applications. The AD706 series (0.15 V/µs) is suitable for precision DC and low-frequency applications.
Q: Can substitute parts be used in existing PCB designs without modification?
A: Yes. All substitute parts use identical 8-SOIC package geometry (0.154", 3.90mm width) with the same pin configuration as the LS204CDT. Direct PCB footprint compatibility is maintained. No PCB layout modifications are required for mechanical placement. Circuit performance may differ based on electrical specification variations, requiring verification through application-specific testing.
Q: What is the operating temperature range compatibility?
A: The LS204CDT operates from 0°C to 70°C. The AD706 series offers two temperature ranges: 0°C to 70°C (AD706JRZ variants) and -40°C to 85°C (AD706ARZ variants). The AD648 series operates from 0°C to 70°C. Applications requiring extended temperature operation below 0°C or above 70°C require the AD706ARZ variants.
Q: Are there inventory considerations for substitute part selection?
A: Inventory availability varies by part number and packaging variant. The AD706 series shows higher total inventory across variants (77,895 units combined). The AD648 series shows lower total inventory (14,933 units combined). Applications with high-volume production requirements should verify long-term availability with component suppliers.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts