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THS4631DR Equivalent & Substitute Parts
Part Overview
The THS4631DR is a general purpose operational amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as an active linear amplifier with a single circuit configuration, designed for general purpose signal conditioning and amplification applications. The part is currently in active product status with 1450 units in stock inventory.
Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter ranges for this amplifier category, maintaining compatibility with 8-SOIC or equivalent package footprints, and meeting the same compliance and environmental specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 1 | — |
| Slew Rate | 1000 | V/µs |
| Gain Bandwidth Product | 210 | MHz |
| -3dB Bandwidth | 325 | MHz |
| Current - Input Bias | 50 | pA |
| Voltage - Input Offset | 260 | µV |
| Current - Supply | 11.5 | mA |
| Voltage - Supply Span (Min) | 10 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature | -40 to 85 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 2 (1 Year) | — |
Substitute Part Grouping Explanation
Substitute parts for the THS4631DR are identified based on the following electrical and mechanical compatibility criteria:
Primary Substitution Parameters:
- Amplifier Type: General Purpose or Voltage Feedback
- Number of Circuits: 1
- Package Compatibility: 8-SOIC surface mount or equivalent footprint
- Operating Temperature Range: -40°C to 85°C minimum
- Supply Voltage Range: Minimum 10V to 30V span capability
- RoHS3 Compliance and REACH Unaffected status
Secondary Compatibility Factors:
- Slew Rate: 460 V/µs or higher acceptable for general purpose applications
- Gain Bandwidth Product: 50 MHz or higher acceptable
- -3dB Bandwidth: 50 MHz or higher acceptable
- Input Bias Current: Within general purpose amplifier specifications
- Input Offset Voltage: Within general purpose amplifier specifications
Substitute parts are grouped by package type (8-SOIC vs. 8-MSOP) and packaging format (Tube, Tape & Reel, Cut Tape & Digi-Reel). All identified substitutes maintain active product status and full compliance certifications.
Parameter Comparison
| Parameter | THS4631DR | AD8021ARZ | AD8021ARZ-REEL | AD8021ARZ-REEL7 | AD817ARZ | AD817ARZ-REEL | AD817ARZ-REEL7 |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Amplifier Type | General Purpose | Voltage Feedback | Voltage Feedback | Voltage Feedback | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Slew Rate (V/µs) | 1000 | 460 | 460 | 460 | 350 | 350 | 350 |
| Gain Bandwidth Product (MHz) | 210 | — | — | — | 50 | 50 | 50 |
| -3dB Bandwidth (MHz) | 325 | 560 | 560 | 560 | 50 | 50 | 50 |
| Current - Input Bias (pA/µA) | 50 pA | 7.5 µA | 7.5 µA | 7.5 µA | 3.3 µA | 3.3 µA | 3.3 µA |
| Voltage - Input Offset (µV) | 260 | 400 | 400 | 400 | 500 | 500 | 500 |
| Current - Supply (mA) | 11.5 | 7.8 | 7.8 | 7.8 | 7 | 7 | 7 |
| Current - Output / Channel (mA) | — | 70 | 70 | 70 | 50 | 50 | 50 |
| Voltage - Supply Span (Min) | 10 V | 4.5 V | 4.5 V | 4.5 V | 5 V | 5 V | 5 V |
| Voltage - Supply Span (Max) | 30 V | 24 V | 24 V | 24 V | 36 V | 36 V | 36 V |
| Operating Temperature (°C) | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 |
| Package / Case | 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 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 2 (1 Year) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
| Inventory (Pcs) | 1450 | 6707 | 5100 | 40200 | 2669 | 17905 | 17686 |
Engineering Selection Recommendations
AD8021 Series (Voltage Feedback Amplifier): The AD8021ARZ, AD8021ARZ-REEL, and AD8021ARZ-REEL7 are voltage feedback amplifiers with higher bandwidth performance (560 MHz -3dB bandwidth) compared to the THS4631DR. These parts are suitable for applications requiring extended frequency response. All variants maintain 8-SOIC package compatibility, ROHS3 compliance, and REACH Unaffected status. The AD8021 series offers improved moisture sensitivity rating (MSL 1 Unlimited vs. MSL 2 for THS4631DR). Supply voltage span for AD8021 is 4.5V to 24V, which overlaps with the THS4631DR range of 10V to 30V within the 10V to 24V window. Packaging format options include Tube, Tape & Reel, and Cut Tape & Digi-Reel configurations with inventory availability ranging from 5100 to 40200 units.
AD817 Series (General Purpose Amplifier): The AD817ARZ, AD817ARZ-REEL, and AD817ARZ-REEL7 are general purpose amplifiers with lower bandwidth (50 MHz -3dB bandwidth) and slew rate (350 V/µs) compared to the THS4631DR. These parts maintain 8-SOIC package compatibility, ROHS3 compliance, and REACH Unaffected status with MSL 1 Unlimited rating. Supply voltage span is 5V to 36V, providing broader maximum voltage capability. The AD817 series is suitable for lower frequency applications where the reduced bandwidth and slew rate are acceptable. Inventory availability ranges from 2669 to 17905 units across packaging formats.
All substitute parts maintain active product status and full compliance certifications equivalent to the THS4631DR.
Frequently Asked Questions (FAQ)
Q: Can AD8021ARZ directly replace THS4631DR in all applications?
A: AD8021ARZ shares the same 8-SOIC package footprint and operating temperature range as THS4631DR. However, the AD8021 is a voltage feedback amplifier with different electrical characteristics. The AD8021 has higher -3dB bandwidth (560 MHz vs. 325 MHz) and lower slew rate (460 V/µs vs. 1000 V/µs). Substitution is valid only when the application requirements are compatible with these performance differences. The supply voltage range overlap is 10V to 24V.
Q: What is the difference between AD8021ARZ, AD8021ARZ-REEL, and AD8021ARZ-REEL7?
A: These three part numbers represent the same AD8021 device in different packaging formats. AD8021ARZ is supplied in Tube packaging. AD8021ARZ-REEL is supplied in Tape & Reel format. AD8021ARZ-REEL7 is supplied in Cut Tape & Digi-Reel format. All three variants have identical electrical specifications and 8-SOIC package dimensions. Selection depends on procurement and assembly requirements.
Q: Is the AD817 series suitable as a substitute for high-speed applications?
A: No. The AD817 series has a -3dB bandwidth of 50 MHz and slew rate of 350 V/µs, both significantly lower than the THS4631DR (325 MHz bandwidth, 1000 V/µs slew rate). The AD817 is suitable only for lower frequency applications where reduced bandwidth is acceptable.
Q: What is the significance of Moisture Sensitivity Level (MSL) differences?
A: The THS4631DR has MSL 2 (1 Year), while all AD8021 and AD817 substitutes have MSL 1 (Unlimited). MSL rating indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 Unlimited provides superior moisture tolerance and longer shelf life compared to MSL 2 (1 Year).
Q: Are all substitute parts ROHS3 compliant?
A: Yes. The THS4631DR and all identified substitute parts (AD8021 series and AD817 series) are ROHS3 compliant and REACH Unaffected, meeting the same environmental and regulatory requirements.
Q: What inventory levels are available for each substitute?
A: AD8021ARZ-REEL7 has the highest inventory at 40200 units. AD817ARZ-REEL has 17905 units. AD817ARZ-REEL7 has 17686 units. AD8021ARZ has 6707 units. AD8021ARZ-REEL has 5100 units. AD817ARZ has 2669 units. The original THS4631DR has 1450 units in stock.
Q: Can AD8021 and AD817 parts be used interchangeably?
A: No. AD8021 is a voltage feedback amplifier with 560 MHz bandwidth, while AD817 is a general purpose amplifier with 50 MHz bandwidth. These represent different amplifier architectures and performance classes. Selection must be based on specific application bandwidth and slew rate requirements.
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