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OPA656UB Equivalent & Substitute Parts
Part Overview
The OPA656UB is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited availability. The OPA656UB delivers 230 MHz gain bandwidth product with 295 V/µs slew rate, designed for high-speed signal conditioning applications requiring low input bias current (1 pA) and minimal input offset voltage (250 µV).
Substitute parts are necessary due to the Last Time Buy status of the OPA656UB. Alternative voltage feedback amplifiers in 8-SOIC packaging with compatible electrical specifications and operating parameters provide design continuity and long-term supply assurance.
Substiute Parts
Key Parameters
| Parameter | OPA656UB | Unit |
|---|---|---|
| Amplifier Type | Voltage Feedback | — |
| Number of Circuits | 1 | — |
| Slew Rate | 295 | V/µs |
| Gain Bandwidth Product | 230 | MHz |
| -3dB Bandwidth | 500 | MHz |
| Current - Input Bias | 1 | pA |
| Voltage - Input Offset | 250 | µV |
| Current - Supply | 14 | mA |
| Current - Output / Channel | 70 | mA |
| Voltage - Supply Span (Min) | 8 | V |
| Voltage - Supply Span (Max) | 12 | 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 | 3 (168 Hours) | — |
Substitute Part Grouping Explanation
Substitution of the OPA656UB is determined by strict alignment of electrical and mechanical parameters within the voltage feedback amplifier category. The following criteria establish valid substitution relationships:
Primary Substitution Criteria:
- Amplifier Type: Voltage Feedback (required)
- Number of Circuits: 1 (required)
- Package / Case: 8-SOIC (0.154", 3.90mm Width) (required)
- Mounting Type: Surface Mount (required)
- Operating Temperature Range: -40°C to 85°C (required)
- Voltage Supply Span: Minimum 8 V to Maximum 12 V (required)
Secondary Electrical Parameters:
- Slew Rate: 295 V/µs or greater
- Gain Bandwidth Product: 230 MHz or greater
- -3dB Bandwidth: 500 MHz or greater
- Current - Input Bias: 1 pA or lower
- Voltage - Input Offset: 250 µV or lower
- Current - Supply: 14 mA or lower
- Current - Output / Channel: 70 mA or greater
Substitute parts are grouped by their ability to meet or exceed these parameters while maintaining full mechanical and thermal compatibility.
Parameter Comparison
| Parameter | OPA656UB | OPA656UB/2K5 | AD8047ARZ | AD8048ARZ | AD9631ARZ | AD9632ARZ | Unit |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | — |
| Product Status | Last Time Buy | Active | Active | Active | Active | Active | — |
| Slew Rate | 295 | 295 | 750 | 1000 | 1300 | 1500 | V/µs |
| Gain Bandwidth Product | 230 | 230 | — | — | — | — | MHz |
| -3dB Bandwidth | 500 | 500 | 250 | 260 | 320 | 250 | MHz |
| Current - Input Bias | 1 | 1 | 1 | 1 | 2 | 2 | µA |
| Voltage - Input Offset | 250 | 250 | 1 | 1 | 3 | 2 | µV |
| Current - Supply | 14 | 14 | 5.8 | 5.9 | 17 | 16 | mA |
| Current - Output / Channel | 70 | 70 | 50 | 50 | 70 | 70 | mA |
| Voltage - Supply Span (Min) | 8 | 8 | 6 | 6 | 6 | 6 | V |
| Voltage - Supply Span (Max) | 12 | 12 | 12 | 12 | 12 | 12 | V |
| Operating Temperature | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | °C |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | — |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 3 (168 Hours) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | — |
Engineering Selection Recommendations
OPA656UB/2K5 (Texas Instruments, Active Status)
The OPA656UB/2K5 is the direct functional equivalent with identical electrical specifications and operating parameters. This part maintains Last Time Buy mitigation through an active product variant from the same manufacturer. Electrical performance is identical across all measured parameters. Moisture sensitivity level remains at MSL 3, consistent with the original OPA656UB. This selection provides maximum design compatibility with zero performance trade-offs.
AD8047ARZ and AD8047ARZ-REEL7 (Analog Devices Inc., Active Status)
These parts provide active product status with lower supply current (5.8 mA versus 14 mA) and improved moisture sensitivity (MSL 1 Unlimited). The -3dB bandwidth of 250 MHz is lower than the OPA656UB specification of 500 MHz. Output current per channel is reduced to 50 mA from 70 mA. These trade-offs result in lower power consumption and improved moisture handling. Selection is appropriate for applications where bandwidth and output current requirements are less stringent than OPA656UB specifications.
AD8048ARZ and AD8048ARZ-REEL7 (Analog Devices Inc., Active Status)
These parts deliver higher slew rate (1000 V/µs versus 295 V/µs) and improved moisture sensitivity (MSL 1 Unlimited). The -3dB bandwidth of 260 MHz is lower than OPA656UB. Output current per channel is 50 mA. Supply current is 5.9 mA. These characteristics support applications requiring faster transient response with reduced power consumption. Bandwidth reduction must be evaluated against application requirements.
AD9631ARZ, AD9631ARZ-REEL, and AD9631ARZ-REEL7 (Analog Devices Inc., Active Status)
These parts provide the highest slew rate (1300 V/µs) and -3dB bandwidth (320 MHz) among available substitutes. Supply current increases to 17 mA. Output current per channel matches OPA656UB at 70 mA. Moisture sensitivity is MSL 1 Unlimited. These characteristics support high-speed applications with enhanced transient performance. Increased supply current must be accommodated in power budget analysis.
AD9632ARZ and AD9632ARZ-REEL7 (Analog Devices Inc., Active Status)
These parts deliver the highest slew rate (1500 V/µs) with -3dB bandwidth of 250 MHz. Supply current is 16 mA. Output current per channel is 70 mA. Moisture sensitivity is MSL 1 Unlimited. These characteristics provide maximum transient response capability with output current matching the original OPA656UB. Selection is appropriate for applications prioritizing slew rate performance.
All substitute parts maintain ROHS3 compliance, 8-SOIC surface mount packaging, and -40°C to 85°C operating temperature range. Voltage supply span compatibility is confirmed across all options.
Frequently Asked Questions (FAQ)
Q: Can OPA656UB/2K5 be used as a direct replacement for OPA656UB?
A: Yes. The OPA656UB/2K5 is electrically and mechanically identical to the OPA656UB. All electrical parameters, package dimensions, and operating specifications are equivalent. The primary advantage is active product status, ensuring continued availability.
Q: What is the difference between AD8047ARZ and AD8048ARZ?
A: The AD8048ARZ provides higher slew rate (1000 V/µs versus 750 V/µs) and slightly higher -3dB bandwidth (260 MHz versus 250 MHz). Both parts share identical supply current (5.8-5.9 mA), input bias current (1 µA), and output current per channel (50 mA). Selection depends on whether the additional slew rate is required for the application.
Q: Why do AD9631ARZ and AD9632ARZ have higher supply current than OPA656UB?
A: The AD9631ARZ and AD9632ARZ deliver higher slew rates (1300 V/µs and 1500 V/µs respectively) compared to OPA656UB (295 V/µs). Higher slew rate capability requires increased quiescent current. The trade-off between power consumption and transient response must be evaluated for each application.
Q: Are all substitute parts available in multiple packaging options?
A: Yes. Analog Devices parts are available in Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel® packaging options. Texas Instruments OPA656UB/2K5 is available in standard packaging. Packaging selection does not affect electrical performance or mechanical compatibility.
Q: What is the significance of Moisture Sensitivity Level (MSL)?
A: MSL rating indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before soldering. OPA656UB has MSL 3 (168 hours). Analog Devices substitutes have MSL 1 (Unlimited), providing superior moisture tolerance and extended shelf life without special storage requirements.
Q: Can I substitute an AD8047ARZ for OPA656UB if my application requires 500 MHz bandwidth?
A: No. The AD8047ARZ provides only 250 MHz -3dB bandwidth, which is insufficient for applications requiring 500 MHz bandwidth. The OPA656UB/2K5, AD9631ARZ, or AD9632ARZ must be selected to maintain the 500 MHz bandwidth specification or higher.
Q: What is the impact of lower output current (50 mA) in AD8047ARZ and AD8048ARZ compared to OPA656UB (70 mA)?
A: Output current capability determines the maximum load current the amplifier can drive. Applications requiring output currents exceeding 50 mA must use OPA656UB, OPA656UB/2K5, AD9631ARZ, or AD9632ARZ, which all provide 70 mA output current per channel.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed maintain ROHS3 compliance, consistent with OPA656UB. REACH status is Unaffected for all parts.
Q: What supply voltage range is compatible with all substitute parts?
A: All substitute parts operate within the 6 V to 12 V supply range. OPA656UB and OPA656UB/2K5 require minimum 8 V. Analog Devices substitutes accept 6 V minimum, providing additional flexibility for lower-voltage applications.
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