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BU7244F-E2 Equivalent & Substitute Parts
Part Overview
The BU7244F-E2 is a CMOS amplifier integrated circuit manufactured by Rohm Semiconductor, configured as a 4-circuit rail-to-rail operational amplifier in a 14-SOP surface mount package. This device is classified as Active product status and is ROHS3 compliant. The BU7244F-E2 serves applications requiring low-power, rail-to-rail amplification with minimal input bias current and moderate bandwidth characteristics. Substitute parts are identified when equivalent electrical performance parameters and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified operational constraints.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | CMOS | — |
| Number of Circuits | 4 | — |
| Output Type | Rail-to-Rail | — |
| Slew Rate | 0.4 | V/µs |
| Gain Bandwidth Product | 900 | kHz |
| Current - Input Bias | 1 | pA |
| Voltage - Input Offset | 1 | mV |
| Current - Supply | 360 | µA |
| Current - Output / Channel | 12 | mA |
| Voltage - Supply Span (Min) | 1.8 | V |
| Voltage - Supply Span (Max) | 5.5 | V |
| Operating Temperature | -40 to 85 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | 14-SOIC (0.173", 4.40mm Width) | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the BU7244F-E2 are identified based on the following critical parameters that determine functional equivalence:
Primary Substitution Criteria:
- Amplifier Type: CMOS configuration
- Number of Circuits: 4 independent amplifier circuits
- Output Type: Rail-to-Rail capability
- Package Configuration: 14-pin SOIC surface mount
- Supply Voltage Range: Minimum 1.8 V to 2.7 V and maximum 5.5 V compatibility
- Operating Temperature Range: Minimum -40°C coverage
- RoHS3 Compliance and MSL Level 1 status
Secondary Performance Parameters:
- Slew Rate: 0.4 V/µs baseline; substitutes with equal or higher slew rates are acceptable
- Gain Bandwidth Product: 900 kHz baseline; substitutes with equal or higher bandwidth are acceptable
- Input Bias Current: 1 pA baseline; substitutes with equal or lower input bias are acceptable
- Input Offset Voltage: 1 mV baseline; substitutes with equal or lower offset are acceptable
- Supply Current: 360 µA baseline; substitutes with equal or lower supply current are acceptable
- Output Current per Channel: 12 mA baseline; substitutes with equal or higher output current are acceptable
Substitute parts from Analog Devices Inc. (AD8544 and AD8604/AD8608 series) meet the core functional requirements while offering enhanced performance characteristics in specific parameters. All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and surface mount configuration.
Parameter Comparison
| Parameter | BU7244F-E2 | AD8544ARZ-REEL | AD8604ARZ-REEL | AD8608ARZ-REEL |
|---|---|---|---|---|
| Manufacturer | Rohm Semiconductor | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Amplifier Type | CMOS | General Purpose | CMOS | CMOS |
| Number of Circuits | 4 | 4 | 4 | 4 |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
| Slew Rate (V/µs) | 0.4 | 0.92 | 6 | 5 |
| Gain Bandwidth Product (MHz) | 0.9 | 1 | 8.4 | 10 |
| Current - Input Bias (pA) | 1 | 4 | 0.2 | 1 |
| Voltage - Input Offset (mV) | 1 | 1 | 0.08 | 0.08 |
| Current - Supply (µA) | 360 | 45 (x4 Channels) | 750 (x4 Channels) | 1000 (x4 Channels) |
| Current - Output / Channel (mA) | 12 | 30 | 50 | 80 |
| Voltage - Supply Span (Min) | 1.8 V | 2.7 V | 2.7 V | 2.7 V |
| Voltage - Supply Span (Max) | 5.5 V | 5.5 V | 5.5 V | 5.5 V |
| Operating Temperature (°C) | -40 to 85 | -40 to 125 | -40 to 125 | -40 to 125 |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 14-SOIC (0.173", 4.40mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Active | Active |
Engineering Selection Recommendations
AD8544 Series (General Purpose Amplifier): The AD8544ARZ-REEL and AD8544ARZ-REEL7 variants are suitable substitutes when general-purpose amplification is required with enhanced bandwidth (1 MHz) and improved slew rate (0.92 V/µs) compared to the BU7244F-E2. These parts maintain compatibility with the 2.7 V to 5.5 V supply range and offer extended operating temperature to 125°C. The AD8544WARZ-R7 variant is available in Tape & Reel packaging. All AD8544 variants are ROHS3 compliant with MSL Level 1 rating and Active product status.
AD8604 Series (CMOS Amplifier - DigiTrim®): The AD8604ARZ, AD8604ARZ-REEL, AD8604ARZ-REEL7, AD8604DRZ, and AD8604DRZ-REEL variants provide CMOS amplification with significantly enhanced performance: 6 V/µs slew rate, 8.4 MHz gain bandwidth product, and 0.2 pA input bias current. These parts are suitable for applications requiring higher bandwidth and faster transient response while maintaining the 2.7 V to 5.5 V supply compatibility and extended temperature range to 125°C. All variants are ROHS3 compliant with MSL Level 1 rating and Active product status.
AD8608 Series (CMOS Amplifier - DigiTrim®): The AD8608ARZ and AD8608ARZ-REEL variants deliver the highest performance among substitutes with 5 V/µs slew rate, 10 MHz gain bandwidth product, and 80 mA output current per channel. These parts are appropriate for applications demanding maximum bandwidth and output drive capability within the 2.7 V to 5.5 V supply range and -40°C to 125°C operating temperature. All variants maintain ROHS3 compliance, MSL Level 1 rating, and Active product status.
Package Consideration: The BU7244F-E2 uses a 14-SOIC package with 4.40 mm width, while all Analog Devices substitutes use 14-SOIC packages with 3.90 mm width. PCB layout verification is required to confirm mechanical fit within the available board space.
Supply Voltage Compatibility: The BU7244F-E2 operates from 1.8 V minimum supply voltage, while all Analog Devices substitutes require minimum 2.7 V supply voltage. Applications operating below 2.7 V supply voltage cannot use these substitutes.
Frequently Asked Questions (FAQ)
Q: Can the AD8544 series directly replace the BU7244F-E2 in all applications?
A: The AD8544 series provides functional substitution for applications requiring 4-circuit rail-to-rail amplification with 2.7 V to 5.5 V supply voltage. However, the minimum supply voltage requirement of 2.7 V (versus 1.8 V for the BU7244F-E2) and the different package width (3.90 mm versus 4.40 mm) must be verified for compatibility with the specific application and PCB layout.
Q: What is the primary advantage of the AD8604 and AD8608 series over the BU7244F-E2?
A: The AD8604 and AD8608 series offer significantly higher bandwidth (8.4 MHz and 10 MHz respectively versus 900 kHz), faster slew rates (6 V/µs and 5 V/µs respectively versus 0.4 V/µs), and lower input bias current (0.2 pA for AD8604 versus 1 pA). These enhancements are suitable for applications requiring faster signal processing and higher frequency response.
Q: Are all substitute parts ROHS3 compliant?
A: Yes, all substitute parts listed (AD8544, AD8604, and AD8608 series) are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the compliance status of the BU7244F-E2.
Q: What is the difference between the various AD8604 and AD8608 packaging options?
A: The AD8604 and AD8608 series are available in multiple packaging configurations: Tube packaging (AD8604ARZ, AD8604DRZ, AD8608ARZ), Cut Tape & Digi-Reel® packaging (AD8604ARZ-REEL, AD8604ARZ-REEL7, AD8604DRZ-REEL, AD8608ARZ-REEL), and Tape & Reel packaging (AD8604WARZ-R7). The packaging selection depends on manufacturing and assembly requirements but does not affect electrical performance.
Q: Can the BU7244F-E2 be used in applications requiring operation below 2.7 V supply voltage?
A: Yes, the BU7244F-E2 operates from 1.8 V minimum supply voltage. None of the Analog Devices substitutes (AD8544, AD8604, AD8608 series) support operation below 2.7 V supply voltage. For applications requiring sub-2.7 V operation, the BU7244F-E2 is the appropriate selection.
Q: What is the significance of the different input offset voltage specifications among the AD8604 variants?
A: The AD8604ARZ and AD8604ARZ-REEL variants specify 80 µV input offset voltage, while the AD8604DRZ and AD8604DRZ-REEL variants specify 1.3 mV input offset voltage. Both values are acceptable substitutes for the BU7244F-E2 (1 mV specification). The lower offset voltage variants (80 µV) provide improved precision for applications sensitive to input offset drift.
Q: Is the extended operating temperature range of the substitute parts (125°C versus 85°C) a limiting factor?
A: No, the extended operating temperature range of the substitute parts (-40°C to 125°C versus -40°C to 85°C for the BU7244F-E2) provides additional operational margin. Applications operating within the BU7244F-E2 temperature range (-40°C to 85°C) are fully compatible with substitute parts rated to 125°C.
Q: How does the supply current consumption compare between the BU7244F-E2 and substitute parts?
A: The BU7244F-E2 specifies 360 µA total supply current. The AD8544 series specifies 45 µA per 4 channels (180 µA total), providing significantly lower power consumption. The AD8604 series specifies 750 µA per 4 channels (3 mA total), and the AD8608 series specifies 1 mA per 4 channels (4 mA total). For low-power applications, the AD8544 series is preferred; for higher-performance applications, the AD8604 and AD8608 series accept higher power consumption.
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