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STMicroelectronics UA741CN
- Part No.:
- UA741CN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
UA741CN.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,193
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Product details
Overview
UA741CN from STMicroelectronics is a general-purpose single operational amplifier in an 8-pin DIP package, featuring ±22 V supply voltage range, 50–200 V/mV large-signal voltage gain, and internal 6 dB/octave compensation for stable unity-gain operation. It delivers 0.25–0.5 V/μs slew rate, ±12 V common-mode input range, and 70–90 dB CMRR - widely used in analog summing, active filtering, and precision voltage follower circuits.
For engineers reviewing the UA741CN datasheet, UA741CN pinout, UA741CN application, or UA741CN equivalent, key selection considerations include its DIP8 mechanical compatibility with legacy UA709 designs, no external frequency compensation requirement, offset null capability, and thermal performance (RthJA = 85 °C/W) in industrial ambient conditions.
Technical Context
The UA741CN implements a classic bipolar-input op-amp architecture with NPN differential pair input stage, Class-A output stage, and internal dominant-pole compensation via a 30 pF capacitor. Its 0.7–1 MHz gain-bandwidth product and 50° phase margin ensure stability without external components across standard feedback configurations.
It supports rail-to-rail input common-mode range up to ±12 V at ±15 V supplies and provides short-circuit protected output delivering 10–40 mA. Input bias current (10–200 nA) and offset voltage (1–6 mV) are optimized for DC-coupled integrators and low-frequency signal conditioning where drift tolerance exceeds 10 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±22 V absolute max; operates from ±5 V to ±20 V - enables wide-range analog front-end design without external regulators. |
| Large-Signal Voltage Gain | 50–200 V/mV (typ. 25 V/mV); sufficient for high-precision closed-loop gain ≥100 without cascading stages. |
| Slew Rate | 0.25–0.5 V/μs; limits full-power bandwidth to ~80 kHz at ±10 V swing - suitable for audio and instrumentation, not RF. |
| Input Offset Voltage | 1–6 mV (25°C); adjustable to <1 mV via pins 1 & 5 - critical for DC-coupled integrators and precision summing. |
| Common-Mode Rejection | 70–90 dB; rejects power-supply ripple and ground noise in single-supply derived rails with decoupling. |
| Gain-Bandwidth Product | 0.7–1 MHz; defines unity-gain stable bandwidth - sets upper limit for active filter cutoffs and closed-loop response. |
Pinout & Package
UA741CN is supplied in an 8-pin dual in-line plastic package (DIP8), 9.02–10.16 mm wide, 7.62–8.26 mm long, with 2.54 mm lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to potentiometer wiper for manual input offset trimming - required for sub-mV DC accuracy. |
| 2 | Inverting Input | Primary feedback node in inverting amplifier, active filter, or transimpedance configuration. |
| 3 | Non-inverting Input | Reference input for voltage followers, non-inverting amplifiers, and comparator hysteresis networks. |
| 4 | VCC− | Negative supply rail connection - must be decoupled to ground with ≥0.1 μF ceramic capacitor. |
| 5 | Offset Null 2 | Second terminal of offset null potentiometer - forms balanced bridge with Pin 1 for zeroing Vio. |
| 6 | Output | Class-A buffered output capable of ±10 V swing into 2 kΩ load; short-circuit protected indefinitely. |
| 7 | VCC+ | Positive supply rail connection - requires local decoupling to minimize supply-induced distortion. |
| 8 | No Connect | Internally unconnected; left floating - no routing or grounding required on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| No external frequency compensation required | Internal 30 pF capacitor ensures unity-gain stability - eliminates layout sensitivity and component count in basic circuits. |
| Offset voltage nulling capability | Pins 1 and 5 support external 10 kΩ potentiometer - enables calibration to ≤0.5 mV for precision DC applications. |
| Short-circuit protected output | Withstands indefinite output-to-rail shorts - allows safe prototyping and fault-tolerant sensor interface design. |
| Large common-mode input range | ±12 V at ±15 V supplies - accommodates signals near supply rails without clipping in single-ended sensor interfaces. |
| High open-loop gain | ≥50 V/mV (≥100 dB) - ensures <0.1% gain error in closed-loop configurations with gain ≥10. |
Applications
| Audio Signal Conditioning | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Amplifying low-level microphone or piezoelectric sensor outputs in battery-powered portable recorders. IC Role / Device Role / Timing Role: Configured as non-inverting amplifier with gain = 100 and 0.1 Hz–20 kHz bandwidth. Use Value: 0.06% THD and 23 nV/√Hz input noise preserve signal fidelity; ±12 V input range accepts biased AC-coupled inputs directly. |
Use Scenario: Converting 4–20 mA current loop signals to 0–5 V for PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: Used as precision transimpedance amplifier with 250 Ω feedback resistor and offset-null calibration. Use Value: Adjustable offset null compensates for DAC or shunt resistor mismatch; 70–90 dB CMRR rejects common-mode noise from shared ground paths. |
| Analog Computing Block | Legacy Equipment Repair |
|
Use Scenario: Building analog integrators and function generators in educational labs and control system simulators. IC Role / Device Role / Timing Role: Core integrator element with 1 MΩ/100 nF RC time constant and compensated feedback network. Use Value: Internal 6 dB/octave compensation prevents oscillation at integration frequencies up to 100 Hz - no external capacitor needed. |
Use Scenario: Replacing obsolete UA709 or LM741 in vintage test equipment, oscilloscopes, and analog synthesizers. IC Role / Device Role / Timing Role: Drop-in replacement maintaining identical pinout, supply behavior, and gain-bandwidth trade-offs. Use Value: Same DIP8 footprint and electrical compatibility with UA709 enables direct substitution without board modification or recalibration. |
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 typical input bias current (80 nA vs. 50 nA) and wider offset voltage spread (2–7 mV). | Same use in integrators and followers; slightly reduced DC accuracy in high-impedance sensor nodes. | Select when cross-manufacturer second sourcing is required and offset trim is available. |
| TL081CP | JFET-input architecture: lower input bias current (30 pA), higher GBP (3 MHz), but requires external compensation for unity-gain stability. | Better for high-Z sources and wider bandwidth; unsuitable for uncompensated low-speed integrators without redesign. | Choose for improved speed and input impedance where circuit stability can be verified with added capacitor. |
Compared with LM741CN, UA741CN offers tighter offset voltage control and better thermal resistance (85 vs. 95 °C/W); versus TL081CP, it trades bandwidth and input impedance for guaranteed unity-gain stability and simpler layout - ideal for cost-sensitive, low-frequency analog systems.
Availability
UA741CN is available at Aetrix Electronics and suitable for industrial sensor interfaces, analog computing blocks, and legacy equipment repair requiring stable component supply and long-term DIP8 availability.
Supply support for UA741CN 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 analog, microcontroller, power, and MEMS products for industrial, automotive, and consumer markets.
The UA741CN belongs to ST's legacy analog op-amp product line, engineered for robustness, ease of use, and backward compatibility in education, maintenance, and cost-sensitive industrial signal conditioning.
FAQ
Can UA741CN operate from a single +12 V supply?
Yes - it supports single-supply operation with input common-mode range extended to within 2 V of VCC− (i.e., down to 0 V at +12 V supply). Output swing reaches ~0.5–10.5 V under load, requiring level-shifting or AC coupling for true rail-to-rail input/output handling.
What is the purpose of Pins 1 and 5?
Pins 1 and 5 are dedicated offset null terminals. Connecting a 10 kΩ potentiometer between them, with its wiper to VCC−, allows precise adjustment of input offset voltage to ≤0.5 mV - essential for DC-coupled integrators and precision summing amplifiers.
How does UA741CN differ from modern rail-to-rail op-amps?
UA741CN uses bipolar input and Class-A output stages, limiting input range to ±12 V and output swing to ~±13 V at ±15 V supplies. Modern rail-to-rail op-amps achieve full supply-range input/output but require careful stability analysis and lack built-in compensation - UA741CN prioritizes simplicity and proven stability over dynamic range.
Is UA741CN suitable for driving capacitive loads?
It is not optimized for direct capacitive loading >100 pF. Driving larger capacitors (e.g., cables or ADC inputs) may cause overshoot or instability; a series resistor (100–470 Ω) between output and load restores stability while preserving bandwidth up to ~100 kHz.
UA741CN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-DIP
UA741CN FAQ
1.How can I place an order for UA741CN through Aetrix?
Please submit a Request for Quotation (RFQ) for UA741CN 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 UA741CN reliable?
The price and inventory of UA741CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA741CN is usually 5 days.
3.What payment methods are accepted for UA741CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA741CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA741CN?
UA741CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA741CN 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 UA741CN?
For technical support, including UA741CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA741CN requirements.
6.How does Aetrix verify that UA741CN is sourced from the original manufacturer or authorized distributors?
All UA741CN 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 UA741CN meets industry standards.
7.What is the process for return or replacement of UA741CN?
All UA741CN units undergo pre-shipment inspection (PSI). If there is an issue with UA741CN, 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 UA741CN part is unused and in its original packaging.
Return procedure for UA741CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UA741CN Tags
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