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STMicroelectronics UA741MDT
- Part No.:
- UA741MDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA741MDT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,543
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Product details
Overview
UA741MDT 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, integrators, and active filters across industrial instrumentation and signal conditioning systems.
For engineers reviewing the UA741MDT datasheet, UA741MDT pinout, UA741MDT application, or UA741MDT equivalent, key selection criteria include input offset voltage (≤6 mV), common-mode rejection ratio (≥70 dB), output short-circuit current (≥10 mA), thermal resistance (125 °C/W), and SO-8 footprint compatibility with legacy DIP8 layouts.
Technical Context
The UA741MDT implements a classic bipolar-input op-amp architecture with direct-coupled differential pair input stage, high-gain Darlington intermediate stage, and Class-A output stage with short-circuit protection. Its internal 30 pF compensation capacitor ensures unconditional stability without external components in unity-gain configurations.
It operates over ±5 V to ±22 V dual supplies, supports ±12 V common-mode input range, delivers ±10 V output swing into 2 kΩ load, and maintains ≥50° phase margin at unity gain-enabling reliable use in precision DC-coupled and low-frequency AC applications up to 10 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±5 V to ±22 V: Enables operation from low-voltage sensor interfaces to high-dynamic-range industrial rails. |
| Input Offset Voltage | 1–6 mV: Determines DC error floor in precision summing or integrator applications without trimming. |
| Slew Rate | 0.25–0.5 V/μs: Limits full-power bandwidth to ~80 kHz at ±10 V output swing; suitable for audio and control loops. |
| Gain-Bandwidth Product | 0.7–1 MHz: Sets closed-loop bandwidth ceiling-e.g., 100 kHz max at gain = 10. |
| Common-Mode Rejection | 70–90 dB: Suppresses power-supply noise and ground bounce in single-supply-derived bias networks. |
| Output Short-Circuit Current | 10–40 mA: Provides inherent fault tolerance during transient overload or miswiring. |
Pinout & Package
UA741MDT is housed in an SO-8 (Small Outline, 8-pin) plastic micropackage per JEDEC MS-012, with 1.27 mm pitch, gull-wing leads, and 1.75 mm maximum height-optimized for automated surface-mount assembly and board space efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to potentiometer wiper for manual input offset voltage trimming. |
| 2 | Inverting Input | Inverts and amplifies signal relative to non-inverting input; high-impedance node (≥0.3 MΩ). |
| 3 | Non-inverting Input | Reference input for follower or non-inverting gain stages; matched bias current path. |
| 4 | VCC− | Negative supply rail connection; must be decoupled locally to minimize noise coupling. |
| 5 | Offset Null 2 | Second terminal of offset null potentiometer; completes DC balance network. |
| 6 | Output | Class-A buffered output capable of ±10 V swing into 2 kΩ with <5% overshoot. |
| 7 | VCC+ | Positive supply rail connection; symmetric dual-rail operation required for full dynamic range. |
| 8 | No Connect | Internally unconnected; must remain floating-no external tie or pull-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| No external frequency compensation required | Internal 30 pF capacitor enables stable unity-gain operation without added components. |
| Large input voltage range | ±12 V common-mode range allows direct interfacing with ±10 V DAC outputs or sensor bridges. |
| Short-circuit protection | Current-limited output stage survives indefinite output-to-rail shorts without damage. |
| No latch-up behavior | Bipolar process prevents parasitic SCR activation under overvoltage or ESD stress. |
| Same pin configuration as UA709 | Drop-in replacement for legacy designs using UA709, preserving PCB layout and interconnect. |
Applications
| Summing Amplifier | Voltage Follower |
|---|---|
Use Scenario: Combining multiple sensor signals (e.g., thermocouple, strain gauge, pressure transducer) into a single analog sum prior to ADC conversion. IC Role / Device Role / Timing Role: High-input-impedance inverting summer with precise resistor-ratio gain setting and DC-coupled summation. Use Value: Maintains ≤6 mV input offset error across all summed channels, minimizing baseline drift in multi-sensor monitoring systems. | Use Scenario: Buffering high-impedance pH probe output (≥1 GΩ source impedance) to drive 10 kΩ data acquisition input without loading error. IC Role / Device Role / Timing Role: Unity-gain buffer isolating sensitive electrochemical sensor from downstream circuitry. Use Value: Delivers ≥0.3 MΩ input resistance and ≤0.5 V/μs slew rate sufficient for slow-varying pH response (≤10 Hz bandwidth). |
| Integrator | Active Low-Pass Filter |
Use Scenario: Converting accelerometer charge output to velocity signal in vibration analysis equipment operating below 100 Hz. IC Role / Device Role / Timing Role: Precision integrator with low input bias current (≤70 nA) and stable 1 MHz GBW for predictable time-constant accuracy. Use Value: Enables integration time constants up to 10 s with <1% drift per hour, supported by internal compensation and ±12 V input range. | Use Scenario: Anti-aliasing filtering before 100 kSPS SAR ADC in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Second-order active low-pass stage with 10 kHz cutoff, configured via external R/C network. Use Value: Achieves ≥70 dB CMRR and 0.06% THD to preserve SNR in 12-bit measurement systems with noisy industrial power rails. |
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 offset voltage (3–7.5 mV), lower CMRR (70 dB min), same SO-8 package. | Less suited for precision summing where offset drift dominates error budget. | Select when cost sensitivity outweighs need for tight DC specs; compatible footprint and pinout. |
| TL081CD | JFET input (50 pA bias current), higher slew rate (13 V/μs), no internal compensation (requires external cap). | Better for high-Z sensor buffering but demands careful stability design and lacks UA741's plug-and-play simplicity. | Choose for low-noise, wide-bandwidth applications where layout and compensation expertise is available. |
Compared with LM741CDR and TL081CD, UA741MDT offers superior input offset voltage consistency and guaranteed unity-gain stability-making it optimal for legacy-replacement and education-focused analog labs where predictability trumps speed or ultra-low bias current.
Availability
UA741MDT is available at Aetrix Electronics and suitable for industrial instrumentation, educational lab kits, and analog signal conditioning requiring stable component supply and long-term obsolescence resilience.
Supply support for UA741MDT 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The UA741MDT belongs to ST's legacy analog amplifier portfolio, engineered for robustness, ease of use, and backward compatibility in maintenance-critical and teaching environments where reliability and documentation maturity are paramount.
FAQ
What is the maximum operating temperature range for UA741MDT?
The UA741MDT is rated for operation from −40 °C to +105 °C ambient temperature, matching the UA741I grade specification. This extended range supports deployment in industrial control cabinets and outdoor sensor enclosures where thermal cycling exceeds commercial-grade limits.
Does UA741MDT require external compensation capacitors?
No. UA741MDT includes an internal 30 pF compensation capacitor that ensures stability in unity-gain and inverting configurations without external components. This eliminates layout complexity and component count versus uncompensated op-amps like TL081.
Can UA741MDT drive a 600 Ω audio line?
Not reliably: its output short-circuit current is rated 10–40 mA, limiting sustained drive into 600 Ω to ≤6 V peak-to-peak before clipping or thermal derating. For line-driving, a dedicated audio op-amp (e.g., NE5532) with higher output current and lower distortion is recommended.
Is pin 8 (N.C.) safe to connect to ground?
No-pin 8 is internally unconnected and must remain electrically floating. Grounding or pulling it high/low may induce leakage paths or parasitic coupling, degrading CMRR or causing unpredictable offset shifts. Always leave pin 8 unconnected per ST's mechanical drawing and schematic guidance.
UA741MDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA741MDT FAQ
1.How can I place an order for UA741MDT through Aetrix?
Please submit a Request for Quotation (RFQ) for UA741MDT 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 UA741MDT reliable?
The price and inventory of UA741MDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA741MDT is usually 5 days.
3.What payment methods are accepted for UA741MDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA741MDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA741MDT?
UA741MDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA741MDT 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 UA741MDT?
For technical support, including UA741MDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA741MDT requirements.
6.How does Aetrix verify that UA741MDT is sourced from the original manufacturer or authorized distributors?
All UA741MDT 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 UA741MDT meets industry standards.
7.What is the process for return or replacement of UA741MDT?
All UA741MDT units undergo pre-shipment inspection (PSI). If there is an issue with UA741MDT, 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 UA741MDT part is unused and in its original packaging.
Return procedure for UA741MDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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