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STMicroelectronics UA741ID
- Part No.:
- UA741ID
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA741ID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,991
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Product details
Overview
UA741ID from STMicroelectronics is a general-purpose single operational amplifier in SO-8 package, featuring ±15 V supply operation, 200 V/mV large-signal voltage gain, 0.5 V/μs slew rate, and internal frequency compensation. It serves as a foundational analog building block in feedback circuits, integrators, and active filters for industrial instrumentation and signal conditioning systems.
For engineers reviewing the UA741ID datasheet, UA741ID pinout, UA741ID application, or UA741ID equivalent, key selection considerations include input offset voltage (≤6 mV), common-mode rejection ratio (≥70 dB), output short-circuit current (10–40 mA), thermal resistance (125 °C/W), and SO-8 footprint compatibility with legacy DIP8 layouts.
Technical Context
The UA741ID implements a classic bipolar-input op-amp architecture with NPN differential pair input stage, Class-A output stage, and internal 30 pF Miller compensation capacitor ensuring unity-gain stability without external components. Its 6 dB/octave dominant-pole compensation provides predictable phase margin (50°) across temperature and load conditions.
It operates over -40°C to +105°C with ±22 V absolute maximum supply rating, supports rail-to-rail input common-mode range (±12 V), and delivers ±10 V output swing into 2 kΩ. Input bias current (10–200 nA) and input resistance (0.3–2 MΩ) reflect its bipolar transistor design heritage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±5 V to ±22 V - supports dual-rail analog systems with headroom for signal swing and transient margins |
| Large-Signal Voltage Gain | 25–200 V/mV - enables high-precision closed-loop gain accuracy in summing and differential configurations |
| Slew Rate | 0.25–0.5 V/μs - limits full-power bandwidth to ~300 kHz, suitable for audio and DC-coupled control loops |
| Input Offset Voltage | 1–6 mV - determines DC error in precision integrators and low-gain sensor amplifiers |
| Common-Mode Rejection Ratio | 70–90 dB - suppresses noise and interference in non-inverting configurations with unbalanced source impedances |
| Output Short-Circuit Current | 10–40 mA - provides inherent protection against momentary overload without external current limiting |
| Gain Bandwidth Product | 0.7–1 MHz - defines unity-gain stable bandwidth; usable up to ~100 kHz at gain ≥10 |
Pinout & Package
UA741ID is supplied in an SO-8 (Small Outline Integrated Circuit, 8-pin) plastic micropackage with gull-wing leads, compliant with ECOPACK® environmental standards. Thermal resistance junction-to-ambient is 125 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset null 1 | Adjustment terminal for trimming input offset voltage using external potentiometer |
| 2 | Inverting input | Negative input node for feedback configuration; high-impedance bipolar base connection |
| 3 | Non-inverting input | Positive input node; matched to pin 2 for CMR optimization |
| 4 | VCC− | Negative supply rail connection; must be decoupled locally for stability |
| 5 | Offset null 2 | Second adjustment terminal completing the offset trim network |
| 6 | Output | Class-A push-pull output stage capable of sourcing/sinking ≥10 mA continuously |
| 7 | VCC+ | Positive supply rail connection; referenced to pin 4 for symmetric operation |
| 8 | No connect | Internally unconnected; left floating per design-no external tie required |
Key Features
| Feature | Design Value |
|---|---|
| No external frequency compensation required | Internal 30 pF Miller capacitor ensures unity-gain stability without added components or layout risk |
| Large input voltage range | ±12 V common-mode range allows direct interfacing with sensors and DACs operating near supply rails |
| Short-circuit protection | Current-limited output stage prevents latch-up or thermal runaway during accidental shorts |
| No latch-up | Bipolar process and isolation structure eliminate destructive parasitic SCR conduction under overvoltage |
| Same pin configuration as UA709 | Enables drop-in replacement in legacy designs without PCB rework or schematic revision |
Applications
| Instrumentation Amplifier Front-End | DC Motor Speed Controller |
|---|---|
Use Scenario: Amplifying low-level thermocouple or strain gauge signals in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Configured as non-inverting amplifier with gain ≥100, providing DC-coupled signal conditioning before ADC sampling. Use Value: Input offset voltage ≤6 mV and CMRR ≥70 dB minimize drift-induced measurement error across industrial temperature ranges. |
Use Scenario: Generating PWM-comparable analog reference voltage for H-bridge gate drivers in 24 V DC motor drives. IC Role / Device Role / Timing Role: Used as error amplifier in closed-loop speed regulation, comparing tachometer feedback to setpoint. Use Value: Internal compensation and ±10 V output swing ensure stable loop response without oscillation under varying motor load inertia. |
| Active Low-Pass Filter (1 kHz) | Summing Amplifier for Sensor Fusion |
Use Scenario: Anti-aliasing filtering of vibration sensor outputs prior to microcontroller ADC acquisition in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: Second-order Sallen-Key topology with unity-gain buffer output stage. Use Value: 0.5 V/μs slew rate and 1 MHz GBW support clean 1 kHz cutoff with <5% passband ripple and monotonic roll-off. |
Use Scenario: Combining outputs from multiple gas concentration sensors (CO, NO₂, VOC) into weighted analog sum for air quality index calculation. IC Role / Device Role / Timing Role: Inverting summing configuration with precision resistor network and buffered output. Use Value: High input impedance (>300 kΩ) prevents cross-talk between sensor channels; 200 V/mV gain maintains resolution across 0–3 V input range. |
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 | Higher input bias current (80–500 nA), wider offset voltage range (3–15 mV), same SO-8 footprint | Less suitable for high-impedance sensor interfaces; acceptable for power supply monitoring or basic comparators | Select when cost sensitivity outweighs precision requirements and LM741 design heritage is preferred |
| TL081CD | JFET input (50 pA bias current), higher slew rate (13 V/μs), no internal compensation (requires external capacitor) | Requires external compensation network; better for wideband AC-coupled applications but increases BOM count | Choose for audio preamps or fast integrators where input impedance >10⁹ Ω and bandwidth >100 kHz is needed |
Compared with LM741CDR and TL081CD, UA741ID offers balanced performance: lower input bias than LM741, built-in stability unlike TL081, and guaranteed -40°C to +105°C operation-making it optimal for industrial analog signal chains requiring reliability without design complexity.
Availability
UA741ID is available at Aetrix Electronics and suitable for industrial instrumentation, motor control systems, and analog filter modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UA741ID 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The UA741ID belongs to ST's legacy analog amplifier product line, engineered for robustness and interoperability in industrial control, test equipment, and educational platforms where proven architecture and long-term availability are critical.
FAQ
Can UA741ID operate from a single supply?
Yes, UA741ID can operate from a single supply (e.g., +10 V and GND) by biasing the inputs within the common-mode range (0 V to +3 V typical). Output swing remains limited to ~1.5 V below VCC and ~1 V above GND. External level-shifting or rail-splitting networks may be required for true ground-referenced signals.
What is the purpose of pins 1 and 5 (offset null)?
Pins 1 and 5 form a two-terminal interface for connecting a 10 kΩ potentiometer to nullify input offset voltage. The wiper connects to VCC− (pin 4), and each end connects to pins 1 and 5. This adjustment reduces DC error in precision integrators and low-gain amplifiers where offset contributes significantly to output drift.
Does UA741ID require external compensation capacitors?
No. UA741ID includes an internal 30 pF Miller compensation capacitor, making it unity-gain stable without external components. This eliminates layout sensitivity and component count in standard inverting/non-inverting configurations, distinguishing it from uncompensated op-amps like TL081.
How does UA741ID differ from UA741CD?
UA741ID is rated for -40°C to +105°C operation and uses SO-8 packaging, while UA741CD is specified for 0°C to +70°C and also uses SO-8. Both share identical electrical characteristics and pinout, but UA741ID is qualified for extended-temperature industrial environments, including factory automation and outdoor control cabinets.
UA741ID 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:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA741ID FAQ
1.How can I place an order for UA741ID through Aetrix?
Please submit a Request for Quotation (RFQ) for UA741ID 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 UA741ID reliable?
The price and inventory of UA741ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA741ID is usually 5 days.
3.What payment methods are accepted for UA741ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA741ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA741ID?
UA741ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA741ID 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 UA741ID?
For technical support, including UA741ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA741ID requirements.
6.How does Aetrix verify that UA741ID is sourced from the original manufacturer or authorized distributors?
All UA741ID 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 UA741ID meets industry standards.
7.What is the process for return or replacement of UA741ID?
All UA741ID units undergo pre-shipment inspection (PSI). If there is an issue with UA741ID, 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 UA741ID part is unused and in its original packaging.
Return procedure for UA741ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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