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STMicroelectronics UA741CD
- Part No.:
- UA741CD
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA741CD.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
UA741CD from STMicroelectronics is a general-purpose single operational amplifier in SO-8 package, featuring ±22 V supply voltage range, 0.5 V/μs typical slew rate, 1 MHz gain-bandwidth product, and internal frequency compensation. It serves as a foundational analog building block in feedback circuits, active filters, and signal conditioning stages for industrial instrumentation and educational lab equipment.
For engineers reviewing the UA741CD datasheet, UA741CD pinout, UA741CD application, or UA741CD equivalent, key selection considerations include input offset voltage (1–6 mV), common-mode rejection ratio (70–90 dB), output short-circuit current (10–40 mA), thermal resistance (125 °C/W), and SO-8 footprint compatibility with legacy DIP8 layouts via adapter boards.
Technical Context
The UA741CD implements a classic bipolar transistor-based op-amp architecture with a 6 dB/octave internal compensation network, enabling stable unity-gain operation without external components. Its high open-loop gain (≥25 V/mV) and wide common-mode input range (±12 V at ±15 V supplies) support precision DC-coupled amplification and integrator stability.
It delivers rail-to-rail compatible output swing (±10 V into 2 kΩ) and low THD (0.06 % at 1 kHz), making it suitable for low-frequency analog signal processing where cost, robustness, and design simplicity outweigh speed or rail-to-rail performance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±22 V - supports dual-supply systems up to ±20 V operation with margin; enables use in legacy industrial rails. |
| Input Offset Voltage | 1–6 mV - sets minimum resolvable DC signal error in precision amplifiers and sensor front-ends. |
| Slew Rate | 0.25–0.5 V/μs - limits large-signal bandwidth to ~80 kHz for 10 Vpp output; adequate for audio and control loops. |
| Gain-Bandwidth Product | 0.7–1 MHz - defines closed-loop bandwidth vs. gain trade-off; e.g., 100 kHz at ×10 gain. |
| Common-Mode Rejection | 70–90 dB - suppresses noise coupled equally to both inputs, critical in noisy industrial environments. |
| Output Short-Circuit Current | 10–40 mA - provides inherent fault tolerance during transient overloads without external current limiting. |
| Thermal Resistance (J-A) | 125 °C/W (SO-8) - determines junction temperature rise under 3.3 mA quiescent current; requires board-level copper area for sustained operation. |
Pinout & Package
UA741CD is housed in an SO-8 (Small Outline Integrated Circuit, 8-pin) plastic micropackage compliant with ECOPACK® environmental standards. The package measures 4.90 mm × 6.00 mm × 1.75 mm (max height) with 1.27 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to potentiometer wiper for manual input offset voltage trimming; required in precision DC applications. |
| 2 | Inverting Input | Primary negative feedback node; accepts signal or reference for inverting amplifier, comparator, or summing configurations. |
| 3 | Non-inverting Input | Positive input terminal; used in voltage followers, non-inverting amplifiers, and level-shifting circuits. |
| 4 | VCC− | Negative supply rail connection; must be decoupled locally to minimize noise coupling into bias circuitry. |
| 5 | Offset Null 2 | Second end of offset null potentiometer; completes external trim network for input stage balancing. |
| 6 | Output | Class-B push-pull output stage; drives loads ≥2 kΩ directly; short-circuit protected but not latch-up immune. |
| 7 | VCC+ | Positive supply rail connection; shares same decoupling best practices as VCC− for PSRR optimization. |
| 8 | N.C. | No internal connection; left unconnected; may be grounded on PCB for mechanical stability if needed. |
Key Features
| Feature | Design Value |
|---|---|
| No external frequency compensation required | Internal 30 pF capacitor ensures unconditional stability in unity-gain and closed-loop configurations without added components. |
| Large input voltage range | ±12 V common-mode range at ±15 V supplies enables direct interfacing with sensors and DACs operating near supply rails. |
| Short-circuit protection | Current-limited output stage prevents damage during accidental output-to-rail shorts or capacitive load transients. |
| Same pin configuration as UA709 | Enables drop-in replacement in legacy designs originally using the older UA709, preserving PCB layout and bill-of-materials. |
| No latch-up behavior | Bipolar process and internal clamping prevent destructive parasitic thyristor activation during input overvoltage events. |
Applications
| Industrial Sensor Signal Conditioning | Audio Pre-amplifier Stage |
|---|---|
Use Scenario: Amplifying low-level thermocouple or strain gauge outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Single-ended DC-coupled amplifier with adjustable gain and offset nulling for millivolt-range signals. Use Value: Input offset trim (pins 1 & 5) reduces system zero-error drift; ±12 V CMR accommodates sensor common-mode shifts across long cables. | Use Scenario: Boosting microphone-level signals before ADC sampling in voice-enabled embedded devices. IC Role / Device Role / Timing Role: Non-inverting AC-coupled preamplifier with gain set by external resistors and bypassed power rails. Use Value: 0.06 % THD at 1 kHz ensures clean audio capture; 125 °C/W θJA allows thermal management with minimal copper area on 2-layer boards. |
| Educational Lab Bench Op-Amp Trainer | Legacy Industrial Control Loop Integrator |
Use Scenario: Teaching fundamental op-amp configurations (inverter, follower, summer) in university electronics labs. IC Role / Device Role / Timing Role: General-purpose analog IC demonstrating real-world limitations like slew rate, GBW, and input bias current. Use Value: Visible slew-induced distortion at high frequencies reinforces theoretical concepts; SO-8 package fits standard breadboard adapters. | Use Scenario: Implementing PI controllers in motor drive feedback paths where stability and reliability supersede speed. IC Role / Device Role / Timing Role: Precision integrator with compensated pole placement and low drift over temperature. Use Value: Internal 6 dB/octave compensation guarantees phase margin ≥50°; ±22 V supply headroom supports 16-bit DAC output ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar general-purpose op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM741CN | Identical pinout and core specs; higher Iib (80–500 nA vs. 10–200 nA) and lower CMRR (70 dB typ.) | Less suitable for high-impedance sensor interfaces due to input bias current mismatch | Select when legacy LM741 documentation or second-source qualification is mandatory |
| TL081CP | JFET input (Iib = 30 pA), higher SR (13 V/μs), no internal compensation - requires external capacitor | Better for high-Z sources and faster signals, but adds design complexity and layout sensitivity | Select when low input bias current or >100 kHz small-signal bandwidth is required |
Compared with LM741CN and TL081CP, UA741CD offers balanced performance: tighter input offset voltage spread than LM741CN and simpler implementation than TL081CP, making it optimal for cost-sensitive, medium-speed industrial analog circuits where ease of use and proven reliability are prioritized.
Availability
UA741CD is available at Aetrix Electronics and suitable for industrial sensor interfaces, educational lab equipment, legacy control system upgrades, and audio pre-amplification requiring stable component supply and long-term obsolescence resilience.
Supply support for UA741CD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.
The UA741 series belongs to ST's legacy analog amplifier portfolio, engineered for robustness, wide supply tolerance, and seamless integration into cost-sensitive analog signal chains where design longevity and field reliability are essential.
FAQ
Can UA741CD operate from a single supply?
Yes, UA741CD can operate from a single supply (e.g., +30 V with ground), but its input common-mode range and output swing are asymmetric. For proper linear operation, the input must remain within ±12 V of the negative rail, and output cannot swing below ~2 V above ground. External biasing or level-shifting is required for true single-supply signal handling.
What is the purpose of pins 1 and 5 (Offset Null)?
Pins 1 and 5 connect to the ends of an external 10 kΩ potentiometer, whose wiper goes to VCC−. Adjusting this potentiometer balances the input transistor pair to reduce input offset voltage to ≤1 mV. This is essential in DC-coupled precision applications such as strain gauge amplifiers or integrators where offset drift affects long-term accuracy.
How does UA741CD differ from UA741ID?
UA741CD is rated for 0 °C to +70 °C operation and uses SO-8 packaging, while UA741ID operates from −40 °C to +105 °C and shares the same SO-8 footprint. Electrical parameters are identical, but UA741ID undergoes extended temperature screening and is qualified for harsher industrial environments, including factory automation and outdoor control cabinets.
Is UA741CD RoHS-compliant and lead-free?
Yes, UA741CD is manufactured in ST's ECOPACK®-compliant SO-8 package, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. The device uses lead-free terminations and halogen-free molding compound, with full compliance documented in ST's official material declarations and packaging data sheets.
UA741CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 1.7mA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA741CD FAQ
1.How can I place an order for UA741CD through Aetrix?
Please submit a Request for Quotation (RFQ) for UA741CD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UA741CD reliable?
The price and inventory of UA741CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA741CD is usually 5 days.
3.What payment methods are accepted for UA741CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA741CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA741CD?
UA741CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA741CD order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UA741CD?
For technical support, including UA741CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA741CD requirements.
6.How does Aetrix verify that UA741CD is sourced from the original manufacturer or authorized distributors?
All UA741CD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UA741CD meets industry standards.
7.What is the process for return or replacement of UA741CD?
All UA741CD units undergo pre-shipment inspection (PSI). If there is an issue with UA741CD, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UA741CD part is unused and in its original packaging.
Return procedure for UA741CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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