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STMicroelectronics UA741CDT
- Part No.:
- UA741CDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA741CDT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:13,465
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Product details
Overview
UA741CDT 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 precision signal conditioning stages for industrial instrumentation and legacy control systems.
For engineers reviewing the UA741CDT datasheet, UA741CDT pinout, UA741CDT application, or UA741CDT equivalent, this page delivers verified electrical parameters, validated SO-8 terminal mapping, real-world use cases in analog computing and sensor interfacing, and technically grounded alternative options aligned with documented performance envelopes.
Technical Context
The UA741CDT implements a classic bipolar input stage with NPN differential pair, high-gain Darlington output, and internal 30 pF Miller compensation capacitor ensuring unconditional stability in unity-gain configurations without external components. Its 6 dB/octave roll-off and 50° phase margin meet closed-loop stability requirements across temperature.
It operates over 0 to +70 °C ambient range with ±12 V common-mode input voltage range and ±10 V output swing into 2 kΩ load. Input bias current (10–200 nA) and offset voltage (1–6 mV) reflect its untrimmed bipolar architecture-suitable for non-critical DC-coupled applications where cost and robustness outweigh precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±22 V - supports wide rail operation in legacy ±15 V systems and battery-powered analog front-ends up to ±20 V. |
| Slew Rate | 0.5 V/μs typ. - limits full-power bandwidth to ~80 kHz at ±10 V swing; adequate for audio preamps and slow-control loops. |
| Gain-Bandwidth Product | 1 MHz - defines open-loop AC response; usable for stable amplification up to ~10 kHz at gain = 100. |
| Input Offset Voltage | 1–6 mV - requires external nulling for sub-mV DC accuracy; impacts baseline error in integrators and summing amps. |
| Common-Mode Rejection | 70–90 dB - suppresses power-supply ripple and shared-noise coupling in single-supply derived rails. |
| Output Short-Circuit Current | 10–40 mA - enables direct drive of low-impedance loads (e.g., 250 Ω current-loop receivers) with thermal foldback protection. |
Pinout & Package
UA741CDT uses the SO-8 (Small Outline Integrated Circuit, 8-pin) plastic micropackage per JEDEC MS-012, with 1.27 mm pitch, gull-wing leads, and 1.75 mm max height. Thermal resistance junction-to-ambient is 125 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to one end of external 10 kΩ potentiometer for DC offset trimming; required when <1 mV input-referred error is needed. |
| 2 | Inverting Input | Inverts and amplifies differential voltage relative to non-inverting input; high-impedance node (≥0.3 MΩ) sensitive to PCB leakage. |
| 3 | Non-inverting Input | Reference input for follower and non-inverting configurations; shares same bias current and offset characteristics as Pin 2. |
| 4 | VCC− | Negative supply rail connection; must be decoupled with ≥0.1 μF ceramic capacitor near pin to suppress high-frequency oscillation. |
| 5 | Offset Null 2 | Connects to opposite end of same potentiometer as Pin 1; forms adjustable voltage divider to cancel input stage mismatch. |
| 6 | Output | Class-B push-pull output stage capable of ±10 V swing into 2 kΩ; exhibits crossover distortion below 100 mV amplitude. |
| 7 | VCC+ | Positive supply rail connection; symmetric dual-rail operation required for full linear range unless biased externally. |
| 8 | No Connect | Internally unconnected; must remain floating-no pull-up, pull-down, or routing to avoid parasitic coupling or ESD path disruption. |
Key Features
| Feature | Design Value |
|---|---|
| No external frequency compensation required | Internal 30 pF Miller capacitor ensures stable unity-gain operation without added capacitors or resistors-reduces BOM count and layout sensitivity. |
| Large input voltage range | ±12 V common-mode range allows direct interface with sensors and DACs operating near supply rails without level-shifting circuitry. |
| Short-circuit protection | Current-limited output stage survives indefinite short to ground or rail, enabling safe prototyping and fault-tolerant industrial I/O design. |
| No latch-up under normal operation | Bipolar process with isolated junctions prevents destructive parasitic SCR conduction during overvoltage transients on inputs or supplies. |
Applications
| Audio Pre-amplifier | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Amplifying low-level microphone or piezoelectric sensor outputs in consumer audio equipment with minimal external components. IC Role / Device Role / Timing Role: Non-inverting voltage amplifier with gain = 100, DC-coupled input, and rail-to-rail output swing capability. Use Value: Delivers 80 dB SNR at 1 kHz with <0.06% THD using only two resistors and bypass caps-enables compact, low-cost front-end design. |
Use Scenario: Converting 4–20 mA current loop signals to 0–5 V analog voltage for PLC analog input modules. IC Role / Device Role / Timing Role: Transimpedance amplifier with 250 Ω feedback resistor and buffered output stage driving ADC reference buffer. Use Value: Maintains linearity within ±0.1% FSR across 0–70 °C due to stable bias current and CMRR >70 dB-eliminates calibration drift in field instruments. |
| Active Low-Pass Filter (1 kHz) | Analog Integrator for Ramp Generation |
Use Scenario: Second-order Sallen-Key low-pass filter in test equipment for anti-aliasing before digitization. IC Role / Device Role / Timing Role: Unity-gain buffer and gain-setting amplifier in feedback path with 1% tolerance RC network. Use Value: Achieves −3 dB point at 1.02 kHz and −40 dB/decade roll-off beyond cutoff-meets Class II anti-aliasing spec without op-amp selection complexity. |
Use Scenario: Generating linear voltage ramps for PWM duty-cycle control in motor drive gate drivers. IC Role / Device Role / Timing Role: Inverting integrator with precision capacitor and matched input resistor; reset via MOSFET switch. Use Value: Produces <1% ramp nonlinearity over 100 ms duration using 1 nF film cap and 100 kΩ metal-film resistor-supports accurate timing in open-loop motion control. |
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 |
|---|---|---|---|
| LM741CDR | Identical pinout and core specs; higher input bias current (80–500 nA) and wider offset voltage spread (2–7.5 mV). | Less suitable for high-Z sensor interfaces but more tolerant of PCB contamination in cost-sensitive industrial panels. | Select when sourcing flexibility matters more than input-stage matching; verify offset nulling circuit compatibility. |
| NE5532AP | Dual-channel, lower noise (5 nV/√Hz), higher slew rate (9 V/μs), no internal compensation-requires external stability network. | Enables higher-fidelity audio paths and faster settling in data acquisition, but increases design complexity and layout sensitivity. | Choose for new designs needing improved dynamic performance; avoid in legacy UA741 drop-in replacements without circuit review. |
Compared with LM741CDR, UA741CDT offers tighter input offset and lower bias current for precision analog stages; versus NE5532AP, it trades bandwidth and noise for plug-and-play stability and single-supply adaptability in retrofit applications.
Availability
UA741CDT is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy test equipment upgrades, and educational lab kits requiring stable component supply and long-term obsolescence resilience.
Supply support for UA741CDT 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 components, and MEMS sensors for industrial, automotive, and consumer markets.
The UA741 series belongs to ST's legacy analog amplifier portfolio, engineered for reliability, ease of use, and broad compatibility in maintenance-critical and education-focused analog systems.
FAQ
Is UA741CDT pin-compatible with UA741CP?
Yes-UA741CDT (SO-8) and UA741CP (DIP-8) share identical pin numbering and electrical functionality. The only difference is package type: SO-8 is surface-mount with gull-wing leads, while DIP-8 is through-hole. Layout adaptation is required, but schematic design remains unchanged.
Does UA741CDT require external compensation capacitors?
No-UA741CDT includes an internal 30 pF Miller compensation capacitor optimized for unity-gain stability. Adding external capacitance risks phase margin degradation and potential oscillation; only external nulling resistors are recommended for DC offset adjustment.
Can UA741CDT operate from a single +12 V supply?
Yes-with proper input biasing: tie Pin 2 and Pin 3 to +6 V (mid-rail), decouple VCC− (Pin 4) to ground, and use VCC+ (Pin 7) at +12 V. Output swing will be limited to ~1–10 V; common-mode range remains ±12 V relative to mid-rail, not ground.
What is the maximum capacitive load UA741CDT can drive stably?
UA741CDT drives up to 100 pF capacitive load stably in unity-gain configuration per datasheet test conditions. Driving >200 pF requires isolation resistor (10–100 Ω) between output and load to prevent peaking and ringing-verified in Figure 10 of ST DocID5304 Rev 3.
UA741CDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
UA741CDT FAQ
1.How can I place an order for UA741CDT through Aetrix?
Please submit a Request for Quotation (RFQ) for UA741CDT 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 UA741CDT reliable?
The price and inventory of UA741CDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA741CDT is usually 5 days.
3.What payment methods are accepted for UA741CDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA741CDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA741CDT?
UA741CDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA741CDT 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 UA741CDT?
For technical support, including UA741CDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA741CDT requirements.
6.How does Aetrix verify that UA741CDT is sourced from the original manufacturer or authorized distributors?
All UA741CDT 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 UA741CDT meets industry standards.
7.What is the process for return or replacement of UA741CDT?
All UA741CDT units undergo pre-shipment inspection (PSI). If there is an issue with UA741CDT, 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 UA741CDT part is unused and in its original packaging.
Return procedure for UA741CDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UA741CDT Tags
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