Request Quote
(Ships tomorrow)
LS204CD Equivalent & Substitute Parts
Part Overview
The LS204CD 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 device 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 LS204CD component is no longer readily procurable. Substitute parts must maintain functional compatibility through matching package configuration, circuit count, and electrical operating parameters within specified tolerances.
Substiute Parts
Key Parameters
| Parameter | LS204CD Value | Unit |
|---|---|---|
| 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 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LS204CD is determined by strict adherence to the following critical parameters: package type (8-SOIC surface mount), circuit count (dual-channel configuration), and electrical operating specifications. The substitute parts are grouped into two functional categories based on amplifier type classification.
Category 1: General Purpose Amplifiers (Functional Equivalents)
General purpose amplifier substitutes maintain the same amplifier type classification as the LS204CD. These parts are suitable for direct replacement in applications where the original general purpose amplifier characteristics are required. The AD706 series (AD706ARZ, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ, AD706JRZ-REEL, AD706JRZ-REEL7) represents active production alternatives with ROHS3 compliance and MSL 1 rating. These devices share the 8-SOIC package configuration and dual-circuit topology.
Category 2: J-FET Amplifiers (Alternative Technology)
J-FET amplifier substitutes employ a different amplifier technology (J-FET input stage) compared to the general purpose LS204CD. The AD648 series (AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, AD648KRZ) represents active production alternatives with ROHS3 compliance and MSL 1 rating. These devices share the 8-SOIC package configuration and dual-circuit topology but offer different electrical characteristics suited to specific application requirements.
Substitution logic is based on: matching package geometry (8-SOIC), matching circuit count (2 circuits), surface mount compatibility, and compliance certifications (ROHS3, MSL 1). All substitute parts listed are in active production status, ensuring long-term availability and supply chain stability.
Parameter Comparison
| Parameter | LS204CD | AD648JRZ | AD648KRZ | AD706ARZ | AD706JRZ | Unit |
|---|---|---|---|---|---|---|
| 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 | — |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | — |
| Slew Rate | 1 | 1.8 | 1.8 | 0.15 | 0.15 | V/µs |
| Gain Bandwidth Product | 2.5 | 1 | 1 | 0.8 | 0.8 | MHz |
| Current - Input Bias | 100 | 5 | 3 | 50 | 50 | pA |
| Voltage - Input Offset | 500 | 750 | 300 | 30 | 30 | µV |
| Current - Supply | 800 | 340 (x2) | 340 (x2) | 750 | 750 | µA |
| Current - Output / Channel | 23 | 15 | 15 | 15 | 15 | mA |
| Voltage - Supply Span (Min) | 6 | 9 | 9 | 4 | 4 | V |
| Voltage - Supply Span (Max) | 30 | 36 | 36 | 36 | 36 | V |
| Operating Temperature | 0°C ~ 70°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 | — |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | — |
Engineering Selection Recommendations
For General Purpose Amplifier Replacement (Recommended Primary Path)
The AD706 series (AD706ARZ, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ, AD706JRZ-REEL, AD706JRZ-REEL7) provides direct functional substitution for the LS204CD in general purpose amplifier applications. All variants maintain ROHS3 compliance and MSL 1 rating. Selection between temperature-rated variants (AD706ARZ for -40°C ~ 85°C operation or AD706JRZ for 0°C ~ 70°C operation) depends on application thermal requirements. Packaging variants (Tube, Cut Tape, or Digi-Reel) are selected based on procurement and assembly workflow requirements. These parts are in active production status with substantial inventory availability.
For J-FET Amplifier Replacement (Alternative Technology Path)
The AD648 series (AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, AD648KRZ) provides substitution through J-FET input stage technology. Selection between standard (AD648JRZ) and precision (AD648KRZ) variants depends on input offset voltage and input bias current requirements. The AD648KRZ variant offers superior input offset voltage (300 µV versus 750 µV) and lower input bias current (3 pA versus 5 pA). All variants maintain ROHS3 compliance and MSL 1 rating. These parts are in active production status with substantial inventory availability.
Compliance and Certification Basis
All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the LS204CD compliance profile. All substitute parts are classified as active production status, ensuring continued availability and supply chain support. The LS204CD obsolete status necessitates transition to active production alternatives for new procurement and long-term system support.
Frequently Asked Questions (FAQ)
Q: Can the AD706 series directly replace the LS204CD in all applications?
A: The AD706 series shares the same package configuration (8-SOIC), circuit count (2 circuits), and general purpose amplifier classification as the LS204CD. However, electrical parameter differences exist. The AD706 operates with lower slew rate (0.15 V/µs versus 1 V/µs) and lower gain bandwidth product (800 kHz versus 2.5 MHz). Applications requiring the LS204CD's higher bandwidth and slew rate performance require evaluation of AD648 series alternatives or circuit redesign.
Q: What is the difference between AD648JRZ and AD648KRZ?
A: Both devices employ J-FET input stage technology and share identical package, circuit count, and most electrical specifications. The AD648KRZ variant offers improved precision specifications: input offset voltage of 300 µV (versus 750 µV for AD648JRZ) and input bias current of 3 pA (versus 5 pA for AD648JRZ). Selection depends on application precision requirements.
Q: Are packaging variants (Tube, Cut Tape, Digi-Reel) electrically equivalent?
A: Yes. Packaging variants of the same base part number (for example, AD706ARZ, AD706ARZ-REEL, AD706ARZ-REEL7) contain identical die and electrical specifications. Packaging differences affect only procurement format, shipping method, and assembly line compatibility. Electrical performance and compliance certifications are identical across packaging variants.
Q: What is the minimum supply voltage requirement for each substitute?
A: The LS204CD requires minimum 6 V supply voltage. The AD706 series requires minimum 4 V supply voltage, providing greater flexibility in low-voltage applications. The AD648 series requires minimum 9 V supply voltage, restricting use in applications with supply voltages below 9 V. Application supply voltage specifications determine substitute part selection.
Q: Do all substitute parts maintain ROHS3 compliance?
A: Yes. All substitute parts listed (AD648 and AD706 series) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the LS204CD compliance profile. Compliance certifications are identical across all packaging variants of each base part number.
Q: What is the operating temperature range for each substitute?
A: The LS204CD operates across 0°C ~ 70°C. The AD706ARZ variant operates across -40°C ~ 85°C, providing extended low-temperature capability. The AD706JRZ, AD648JRZ, and AD648KRZ variants operate across 0°C ~ 70°C, matching the LS204CD temperature range. Application thermal requirements determine temperature-rated variant selection.
Q: Can the LS204CD be used interchangeably with the AD648 series in existing designs?
A: Interchangeability requires evaluation of specific application requirements. Both device types share 8-SOIC package configuration and dual-circuit topology. However, the AD648 series employs J-FET input stage technology with different electrical characteristics (lower input bias current, higher slew rate, different gain bandwidth product). Circuit performance may differ. Applications with critical bandwidth or slew rate specifications require detailed electrical comparison before substitution.
Q: What inventory status should be considered for long-term supply planning?
A: The LS204CD is classified as obsolete with 3,195 pieces in current stock. All substitute parts are in active production status with substantially higher inventory levels (ranging from 1,434 to 26,676 pieces depending on variant). For new designs and long-term system support, active production alternatives (AD706 or AD648 series) are recommended to ensure continued availability and supply chain stability.
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