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LM833D Equivalent & Substitute Parts
Part Overview
The LM833D is an audio amplifier integrated circuit manufactured by STMicroelectronics, configured as a dual-channel (2 circuit) operational amplifier in an 8-SOIC surface mount package. The device is classified as obsolete, indicating discontinued production and limited availability for new designs. The LM833D operates across a wide supply voltage range of 5V to 30V with a slew rate of 7V/µs and gain bandwidth product of 16 MHz, making it suitable for audio frequency applications requiring moderate bandwidth and output current capability of 37 mA per channel.
Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, component sourcing, and system maintenance. Substitute components must maintain functional compatibility within the 8-SOIC package format while meeting the electrical requirements of the original application.
Substiute Parts
Key Parameters
| Parameter | LM833D Value | Unit |
|---|---|---|
| Amplifier Type | Audio | — |
| Number of Circuits | 2 | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Slew Rate | 7 | V/µs |
| Gain Bandwidth Product | 16 | MHz |
| Current - Input Bias | 300 | nA |
| Voltage - Input Offset | 300 | µV |
| Current - Supply | 4 | mA |
| Current - Output / Channel | 37 | mA |
| Voltage - Supply Span (Min) | 5 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature | -40°C ~ 105°C | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM833D is determined by the following critical parameters:
Mandatory Compatibility Criteria:
- Package format: 8-SOIC (0.154", 3.90mm Width) surface mount configuration
- Circuit count: Dual-channel (2 circuits) operational amplifier topology
- Supply voltage range: Minimum 5V to maximum 30V operation
- Output current capability: Minimum 37 mA per channel
- Slew rate: Minimum 7V/µs for audio frequency response
- Gain bandwidth product: Minimum 16 MHz for audio bandwidth requirements
Substitution Logic:
The substitute parts identified fall into two functional categories based on amplifier type:
-
J-FET Amplifier Substitutes (AD648 Series): These parts operate with J-FET input stages, providing extremely low input bias current (3–5 pA) compared to the LM833D (300 nA). While the AD648 series maintains the 8-SOIC package and dual-channel configuration, these devices exhibit reduced slew rate (1.8V/µs) and lower gain bandwidth product (1 MHz), making them suitable only for applications where the lower bandwidth is acceptable and ultra-low input bias current is required.
-
General Purpose Amplifier Substitutes (AD706 Series): These parts provide general-purpose operational amplifier functionality in the 8-SOIC dual-channel package. The AD706 series operates with supply voltages from 4V to 36V, accommodating the LM833D supply range. However, the AD706 exhibits significantly lower slew rate (0.15V/µs) and gain bandwidth product (800 kHz), restricting its use to low-frequency applications.
All substitute parts maintain 8-SOIC package compatibility, dual-channel configuration, and surface mount mounting type. Substitution selection depends on whether the application can tolerate reduced bandwidth and slew rate performance.
Parameter Comparison
| Parameter | LM833D | AD648JRZ | AD648JRZ-REEL | AD648JRZ-REEL7 | AD648KRZ | AD706ARZ | AD706ARZ-REEL | AD706ARZ-REEL7 | AD706JRZ | AD706JRZ-REEL | AD706JRZ-REEL7 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Amplifier Type | Audio | 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 (V/µs) | 7 | 1.8 | 1.8 | 1.8 | 1.8 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 |
| Gain Bandwidth Product (MHz) | 16 | 1 | 1 | 1 | 1 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| Current - Input Bias (pA/nA) | 300 nA | 5 pA | 5 pA | 5 pA | 3 pA | 50 pA | 50 pA | 50 pA | 50 pA | 50 pA | 50 pA |
| Voltage - Input Offset (µV) | 300 | 750 | 750 | 750 | 300 | 30 | 30 | 30 | 30 | 30 | 30 |
| Current - Output / Channel (mA) | 37 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Voltage - Supply Span Min (V) | 5 | 9 | 9 | 9 | 9 | 4 | 4 | 4 | 4 | 4 | 4 |
| Voltage - Supply Span Max (V) | 30 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 |
| Operating Temperature (°C) | -40 ~ 105 | 0 ~ 70 | 0 ~ 70 | 0 ~ 70 | 0 ~ 70 | -40 ~ 85 | -40 ~ 85 | -40 ~ 85 | 0 ~ 70 | 0 ~ 70 | 0 ~ 70 |
| 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 |
Engineering Selection Recommendations
Product Status Considerations:
The LM833D is classified as obsolete, indicating that STMicroelectronics has discontinued production. All identified substitute parts from Analog Devices Inc. maintain active product status, ensuring ongoing availability and manufacturing support. Selection of an active substitute part provides long-term supply chain stability and access to current manufacturing processes.
Compliance and Certification:
All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory compliance profile of the LM833D. All parts carry EAR99 ECCN classification and REACH Unaffected status, consistent with the original component's regulatory standing.
Packaging and Mounting Compatibility:
All substitute parts are available in 8-SOIC surface mount packages with identical physical dimensions (0.154", 3.90mm Width), ensuring direct PCB footprint compatibility. Packaging variants (Tube, Cut Tape, Digi-Reel) are available across the substitute product lines, accommodating different procurement and assembly workflows.
Performance Trade-offs:
The AD648 series (J-FET amplifiers) provides the closest electrical performance match to the LM833D in terms of supply voltage range (9V–36V encompasses the LM833D 5V–30V range) and output current capability (15 mA per channel). However, the AD648 exhibits reduced slew rate (1.8V/µs versus 7V/µs) and significantly lower gain bandwidth product (1 MHz versus 16 MHz), restricting its use to applications where audio bandwidth requirements do not exceed 1 MHz.
The AD706 series (general-purpose amplifiers) offers the widest supply voltage range (4V–36V) and lowest input offset voltage (30 µV), but exhibits the most significant performance reduction with slew rate of 0.15V/µs and gain bandwidth product of 800 kHz. The AD706 is suitable only for DC-coupled or very low-frequency applications.
Temperature Range Considerations:
The LM833D operates across -40°C to 105°C. The AD648 series operates from 0°C to 70°C, and the AD706 series offers variants spanning -40°C to 85°C (AD706ARZ variants) or 0°C to 70°C (AD706JRZ variants). Applications requiring the full -40°C to 105°C range of the LM833D cannot be directly substituted with the listed parts.
Frequently Asked Questions (FAQ)
Q: Can the AD648 series directly replace the LM833D in audio applications?
A: The AD648 series maintains 8-SOIC package compatibility and dual-channel configuration. However, the AD648 exhibits 1.8V/µs slew rate and 1 MHz gain bandwidth product compared to the LM833D's 7V/µs and 16 MHz specifications. Direct substitution is limited to audio applications operating below 1 MHz bandwidth. Applications requiring the full 16 MHz bandwidth of the LM833D cannot use the AD648 series.
Q: What is the significance of the different AD648 and AD706 packaging variants?
A: The packaging variants (Tube, Cut Tape, Digi-Reel) refer to the physical delivery format for component procurement and assembly. AD648JRZ and AD706ARZ are supplied in Tube packaging. AD648JRZ-REEL, AD706ARZ-REEL, AD648JRZ-REEL7, and AD706ARZ-REEL7 are supplied in Cut Tape with Digi-Reel format. All variants contain identical electrical specifications; packaging selection depends on assembly equipment compatibility and procurement volume requirements.
Q: Why does the AD648KRZ have different input offset voltage than other AD648 variants?
A: The AD648KRZ is a higher-grade variant of the AD648 base product, specified with 300 µV input offset voltage (matching the LM833D) compared to 750 µV for the standard AD648JRZ variants. The AD648KRZ maintains identical slew rate (1.8V/µs) and gain bandwidth product (1 MHz) specifications. The improved input offset voltage specification may provide better DC accuracy in precision applications, though bandwidth limitations remain unchanged.
Q: Can the AD706 series substitute for the LM833D in high-frequency audio circuits?
A: No. The AD706 series exhibits 0.15V/µs slew rate and 800 kHz gain bandwidth product, significantly below the LM833D's 7V/µs and 16 MHz specifications. The AD706 is restricted to DC-coupled or very low-frequency applications below 800 kHz. Applications requiring audio frequency response at or above 1 MHz cannot use the AD706 series.
Q: What are the supply voltage compatibility considerations for substitution?
A: The LM833D operates from 5V to 30V. The AD648 series operates from 9V to 36V, requiring a minimum 9V supply (4V higher than the LM833D minimum). The AD706 series operates from 4V to 36V, accommodating the full LM833D supply range. Applications operating at 5V to 8V supply voltage cannot use the AD648 series but can use the AD706 series.
Q: How do input bias current differences affect circuit design?
A: The LM833D specifies 300 nA input bias current. The AD648 series specifies 3–5 pA input bias current (approximately 60,000 times lower), and the AD706 series specifies 50 pA input bias current (approximately 6,000 times lower). Lower input bias current reduces errors in high-impedance input circuits and simplifies biasing network design. However, this advantage is offset by the reduced bandwidth and slew rate of the substitute parts.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All identified substitute parts (AD648 and AD706 series) maintain ROHS3 compliance, matching the environmental compliance profile of the LM833D. All parts are also MSL 1 (Unlimited) rated, indicating no moisture sensitivity restrictions during storage or handling.
Q: What is the impact of reduced output current capability in substitutes?
A: The LM833D provides 37 mA per channel output current. All substitute parts (AD648 and AD706 series) provide 15 mA per channel output current, approximately 40% of the original specification. Applications requiring output currents exceeding 15 mA per channel cannot use these substitutes and require alternative components with higher output current ratings.
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