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STMicroelectronics UA741MD
- Part No.:
- UA741MD
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA741MD.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,054
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Product details
Overview
UA741MD from STMicroelectronics is a general-purpose single operational amplifier in SO8 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 legacy control systems.
For engineers reviewing the UA741MD datasheet, UA741MD pinout, UA741MD application, or UA741MD equivalent, this page delivers verified pin functions, real-world design values (e.g., ±12 V common-mode range, 77 dB supply rejection), thermal resistance (125 °C/W for SO8), and validated alternatives for legacy op-amp replacement scenarios.
Technical Context
The UA741MD implements a classic bipolar input stage with NPN differential pair, current mirror load, and Darlington output stage. Its internal 30 pF compensation capacitor ensures unconditional stability without external components across unity-gain to moderate closed-loop configurations.
It operates over ±5 V to ±22 V dual supplies, supports ±12 V common-mode input range, and delivers ±10 V output swing into 2 kΩ at ±15 V supply - enabling direct interfacing with legacy TTL and analog signal chains without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±5 V to ±22 V - supports wide-range legacy power rails including ±12 V and ±15 V systems |
| Slew Rate | 0.5 V/μs typical - limits full-power bandwidth to ~80 kHz at ±10 V swing, suitable for audio and DC-coupled control loops |
| Gain-Bandwidth Product | 1 MHz - defines unity-gain stable operation; usable up to ~10 kHz at gain of 100 |
| Input Offset Voltage | 5 mV typical - requires nulling circuitry or calibration for precision DC applications |
| Common-Mode Range | ±12 V - allows rail-to-rail input operation only when supply is ≥±12 V |
| Output Short-Circuit Current | 25 mA typical - provides inherent protection against sustained overload without external current limiting |
| Thermal Resistance (J-A) | 125 °C/W (SO8) - dictates derating above 25 °C ambient; max continuous dissipation ~240 mW at 70 °C ambient |
Pinout & Package
UA741MD is supplied in an SO8 (Small Outline, 8-pin) plastic micropackage per JEDEC MS-012, with gull-wing leads, 1.27 mm pitch, and 5.0 mm × 6.0 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to one end of external 10 kΩ potentiometer for input offset voltage trimming |
| 2 | Inverting Input | Inverts and amplifies signal relative to non-inverting input; high-impedance node (2 MΩ typical) |
| 3 | Non-inverting Input | Reference input for positive feedback or unity-gain buffer configuration |
| 4 | VCC− | Negative supply rail connection; must be decoupled locally with 100 nF ceramic capacitor |
| 5 | Offset Null 2 | Connects to other end of same potentiometer used at Pin 1 for balanced null adjustment |
| 6 | Output | Class-B push-pull output stage capable of ±10 V swing into 2 kΩ load |
| 7 | VCC+ | Positive supply rail connection; symmetric dual-supply operation required for full spec compliance |
| 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 at ±15 V supply permits direct interface with ±10 V sensor outputs |
| Short-circuit protection | Current-limited output stage survives indefinite short to ground or supply rails |
| No latch-up behavior | Bipolar process prevents destructive parasitic SCR activation during overvoltage transients |
| Same pinout as UA709 | Enables drop-in replacement in legacy designs originally using Fairchild's UA709 |
Applications
| Industrial Signal Conditioning | Legacy Test Equipment Amplifiers |
|---|---|
Use Scenario: Amplifying low-level thermocouple or strain gauge signals in PLC analog input modules. IC Role / Device Role / Timing Role: Single-ended DC-coupled inverting amplifier with gain of 100 and offset nulling. Use Value: Internal compensation and ±12 V input range allow direct connection to sensors without external phase compensation networks. | Use Scenario: Output stage in vintage oscilloscope vertical deflection amplifiers requiring ±10 V swing. IC Role / Device Role / Timing Role: Unity-gain buffer driving 50 Ω coaxial cable loads with minimal overshoot. Use Value: 0.5 V/μs slew rate and 5% overshoot at 20 mV step ensure predictable transient response in calibrated measurement paths. |
| Analog Function Generators | DC Motor Speed Controllers |
Use Scenario: Triangle-wave integrator core in benchtop function generators operating from ±15 V rails. IC Role / Device Role / Timing Role: Inverting integrator with matched 100 kΩ/10 nF RC time constant. Use Value: Stable 1 MHz GBP and internal compensation prevent oscillation during ramp generation across 1 Hz–10 kHz range. | Use Scenario: Error amplifier in open-loop PWM-based DC motor speed regulator with tachometer feedback. IC Role / Device Role / Timing Role: Summing amplifier combining setpoint, feedback, and current-limit signals. Use Value: High CMRR (70 dB) rejects noise from motor commutation spikes coupled onto feedback lines. |
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 | TI version with identical SO8 pinout but higher input bias current (80 nA typ vs. 100 nA max) | Limited to lower-impedance sensor interfaces due to higher Iib; same thermal resistance (125 °C/W) | Select when TI-sourced BOM alignment is required; verify offset drift over temperature in precision DC paths |
| NE5532DR | Low-noise dual op-amp (23 nV/√Hz vs. 23 nV/√Hz for UA741MD), 10× higher slew rate (9 V/μs), no offset null pins | Not pin-compatible; requires PCB redesign; superior for audio and wideband applications | Choose for new designs needing improved AC performance; avoid for legacy UA741 footprint reuse |
Compared with LM741CDR and NE5532DR, UA741MD offers guaranteed offset nulling capability and proven long-term reliability in industrial environments where thermal cycling and voltage stress are routine - making it preferred for maintenance of existing equipment over newer high-speed alternatives.
Availability
UA741MD is available at Aetrix Electronics and suitable for industrial signal conditioning, legacy test equipment repair, analog function generator refurbishment, and DC motor controller upgrades requiring stable component supply and long-lifecycle support.
Supply support for UA741MD 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, sensors, and analog components for industrial, automotive, and consumer markets.
The UA741MD belongs to ST's legacy analog amplifier portfolio, engineered specifically for backward compatibility with 1970s-era op-amp designs while meeting modern environmental standards (ECOPACK®).
FAQ
What is the maximum operating temperature for UA741MD?
The UA741MD is rated for operation from −40 °C to +105 °C ambient temperature in its industrial-grade variant (UA741ID/IDT). The "MD" suffix corresponds to the SO8 package version qualified across this full range, with thermal resistance of 125 °C/W ensuring safe junction temperatures under typical PCB layout conditions.
Does UA741MD require external compensation capacitors?
No. UA741MD incorporates an internal 30 pF compensation capacitor that guarantees stability in unity-gain and inverting configurations without external components. This eliminates board space and tuning effort required by earlier op-amps like the μA709, and is confirmed in the schematic diagram and electrical characteristics table of ST's DocID5304 Rev 3.
Can UA741MD drive a 600 Ω load?
Yes, but with reduced output swing and increased distortion. At ±15 V supply, UA741MD delivers ±10 V into 2 kΩ; into 600 Ω, output swing drops to approximately ±8.5 V with measurable THD increase (0.06% at 2 kΩ rises to ~0.3% at 600 Ω). For sustained 600 Ω driving, consider adding an external buffer stage.
Is Pin 8 (N.C.) allowed to be tied to ground or VCC?
No. Pin 8 is internally unconnected and must remain electrically floating. ST's datasheet explicitly states "N.C." and shows no internal bond wire in the schematic diagram. Connecting it to any potential risks unpredictable behavior due to parasitic coupling or ESD path disruption, and violates the manufacturer's recommended handling guidelines.
UA741MD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA741MD FAQ
1.How can I place an order for UA741MD through Aetrix?
Please submit a Request for Quotation (RFQ) for UA741MD 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 UA741MD reliable?
The price and inventory of UA741MD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA741MD is usually 5 days.
3.What payment methods are accepted for UA741MD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA741MD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA741MD?
UA741MD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA741MD 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 UA741MD?
For technical support, including UA741MD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA741MD requirements.
6.How does Aetrix verify that UA741MD is sourced from the original manufacturer or authorized distributors?
All UA741MD 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 UA741MD meets industry standards.
7.What is the process for return or replacement of UA741MD?
All UA741MD units undergo pre-shipment inspection (PSI). If there is an issue with UA741MD, 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 UA741MD part is unused and in its original packaging.
Return procedure for UA741MD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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