UA747CD Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The UA747CD is a dual general-purpose voltage-feedback operational amplifier with internal frequency compensation, 70 dB minimum CMRR, and 0.5 µA maximum bias current in an 8-pin SOIC package. It operates on dual supplies and suits a wide range of analog signal conditioning applications. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- UA747CD Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of UA747CD?
- Dual op-amp in a single 8-pin SOIC package reduces component count and board space compared to using two single op-amp ICs in separate packages
- Internal frequency compensation simplifies design by eliminating the need for external phase-compensation networks, reducing BOM cost and design time
- 70 dB minimum CMRR and 90 dB typical CMRR enables effective rejection of common-mode noise in differential signal paths and instrumentation front-ends
What is UA747CD used for?
The UA747CD suits general-purpose analog signal conditioning circuits such as instrumentation amplifiers, active filters, and integrators in industrial control systems. Its dual-amplifier configuration in an SOIC package is convenient for compact audio preamplifier stages and sensor signal chains where two gain stages are needed back-to-back. Legacy industrial equipment maintenance and educational electronics labs also frequently use the 747-family dual op-amp due to its long-standing availability and well-documented performance characteristics.
What are the specifications of UA747CD?
| Pbfree Code | No |
| YTEOL | 0 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Average Bias Current-Max (IIB) | 0.5 µA |
| Bias Current-Max (IIB) @25C | 0.5 µA |
| Common-mode Reject Ratio-Min | 70dB |
| Common-mode Reject Ratio-Nom | 90dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 6000 µV |
| JESD-30 Code | R-PDSO-G14 |
| Low-Bias | NO |
| Low-Offset | NO |
| Micropower | NO |
| Neg Supply Voltage Limit-Max | -18 V |
| Neg Supply Voltage-Nom (Vsup) | -15 V |
| Number of Functions | 2 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Slew Rate-Nom | 0.5V/us |
| Supply Current-Max | 5.6mA |
| Supply Voltage Limit-Max | 18V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Unity Gain BW-Nom | 1000 |
| Voltage Gain-Min | 25000 |
| Wideband | NO |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Where can I find the UA747CD datasheet?
UA747CD Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for UA747CD?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the UA747CD CMRR specification affect noise rejection in a differential measurement circuit?
The UA747CD offers a minimum 70 dB CMRR and a typical 90 dB CMRR at DC, meaning common-mode interference (such as 50 Hz or 60 Hz power-line noise) appearing equally on both inputs is attenuated by at least 70 dB — reducing a 1 V common-mode signal to under 316 µV at the output. For precise sensor measurements in industrial environments with significant electrical interference, a 90 dB typical CMRR translates to a common-mode rejection factor of approximately 31,623, keeping interference well below the signal of interest.
Why is internal frequency compensation important when selecting an op-amp like the UA747CD for a feedback amplifier?
Without internal frequency compensation, a wideband op-amp can oscillate when connected in a closed-loop feedback configuration due to excess phase shift at high frequencies. The UA747CD's built-in compensation rolls off the open-loop gain at approximately 6 dB per octave above a few kHz, ensuring a 45° or greater phase margin for gains as low as unity. This allows engineers to use the device directly without calculating or adding external compensation capacitors, which simplifies the design and reduces the risk of instability in prototype layouts.
What input offset voltage should designers budget for when using the UA747CD in a precision low-level signal path?
The UA747CD specifies a maximum input offset voltage of 6000 µV (6 mV) at 25°C. For a non-inverting amplifier with a gain of 100, this offset appears as up to 600 mV error at the output, which is too large for precision 12-bit or 16-bit ADC front-ends without trimming. Designers requiring sub-1 mV offset should consider a precision op-amp with a maximum VOS below 100 µV; the UA747CD is better suited to general-purpose gains of 1× to 10× or applications where the 6 mV worst-case offset is within the acceptable error budget.
When is the UA747CD a practical dual-supply alternative to modern single-supply op-amps in legacy equipment repair?
In legacy industrial and test equipment originally designed for ±12 V or ±15 V dual supplies, the UA747CD is a direct pin-compatible replacement for original 747-family devices without requiring power-supply redesign. Modern single-supply op-amps often require rail-to-rail input and output stages optimized for 3.3 V or 5 V, which would need additional bias network changes to work in a ±15 V system. For maintenance and refurbishment of equipment that already has ±12 V or ±15 V rails, using the UA747CD in the original SOIC-8 footprint eliminates redesign cost and board modifications.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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