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STMicroelectronics UA741IDT
- Part No.:
- UA741IDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA741IDT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,080
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Product details
Overview
UA741IDT 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 signal conditioning and test equipment.
For engineers reviewing the UA741IDT datasheet, UA741IDT pinout, UA741IDT application, or UA741IDT equivalent, key selection considerations include input offset voltage (1–6 mV), common-mode rejection ratio (70–90 dB), output short-circuit current (10–40 mA), thermal resistance (125 °C/W), and SO-8 footprint compatibility with legacy DIP-8 layouts.
Technical Context
The UA741IDT implements a classic bipolar input stage with NPN differential pair, Class-A output stage, and internal 30 pF Miller compensation capacitor ensuring unconditional stability without external components. Its 6 dB/octave roll-off and 50° phase margin support unity-gain stable operation across capacitive loads up to 100 pF.
It operates over ±5 V to ±22 V dual supplies or 10 V to 40 V single supply, with input common-mode range extending to ±12 V and output swing reaching ±10 V into 2 kΩ. Input bias current (10–200 nA) and input resistance (0.3–2 MΩ) reflect its bipolar transistor architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±5 V to ±22 V - supports wide-range analog rails including ±12 V and ±15 V systems |
| Slew Rate | 0.5 V/μs typ - limits large-signal bandwidth to ~160 kHz for 10 Vpp output |
| Gain-Bandwidth Product | 1 MHz - sets closed-loop bandwidth at 100 kHz for gain = 10 configuration |
| Input Offset Voltage | 1–6 mV - contributes ≤60 mV error in unity-gain follower with 10 V input |
| CMRR | 70–90 dB - rejects 0.3–0.03 % of common-mode interference at 25 °C |
| Output Short-Circuit Current | 10–40 mA - enables direct drive of low-impedance loads but requires thermal derating |
| Thermal Resistance θJA | 125 °C/W (SO-8) - limits continuous power dissipation to ~240 mW at 70 °C ambient |
Pinout & Package
UA741IDT is housed in an SO-8 (Small Outline Integrated Circuit, 150 mil width) plastic micropackage compliant with ECOPACK® environmental standards. The package features 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 trimming |
| 2 | Inverting Input | Inverts and amplifies signal relative to non-inverting input; high-impedance node |
| 3 | Non-inverting Input | Reference input for positive feedback configurations; matched impedance to Pin 2 |
| 4 | VCC− | Negative supply rail connection; must be decoupled near device |
| 5 | Offset Null 2 | Connects to other end of same potentiometer used on Pin 1 for balanced nulling |
| 6 | Output | Class-A push-pull stage output; capable of ±10 V swing into 2 kΩ load |
| 7 | VCC+ | Positive supply rail connection; referenced to Pin 4 ground path |
| 8 | No Connect | Internally unconnected; must remain floating per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| No external frequency compensation required | Internal 30 pF Miller capacitor ensures stability in unity-gain and inverting configurations without added components |
| Large input voltage range | ±12 V common-mode range allows operation with signals near supply rails in ±15 V systems |
| Short-circuit protection | Current-limited output stage prevents damage during sustained output-to-rail shorts |
| No latch-up behavior | Bipolar process design avoids parasitic SCR activation under overvoltage or ESD stress |
| Same pinout as UA709 | Enables drop-in replacement in legacy designs originally using Fairchild's UA709 op-amp |
Applications
| Audio Signal Conditioning | Industrial Sensor Amplification |
|---|---|
Use Scenario: Amplifying low-level microphone or line-level audio signals in analog mixing consoles and portable recorders. IC Role / Device Role / Timing Role: Configured as non-inverting amplifier or active filter stage to boost signal above noise floor before ADC conversion. Use Value: 0.06 % THD at 1 kHz ensures minimal harmonic distortion in mid-frequency band critical for fidelity. | Use Scenario: Conditioning outputs from RTDs, strain gauges, or thermocouples in PLC analog input modules. IC Role / Device Role / Timing Role: Used in precision instrumentation amplifier front-end or as part of a 3-op-amp IA topology. Use Value: 70–90 dB CMRR rejects common-mode noise from long sensor cables in electrically noisy factory environments. |
| Test Equipment Waveform Generation | Power Supply Feedback Control |
Use Scenario: Building function generators and integrator-based ramp/sawtooth waveform synthesizers in benchtop test gear. IC Role / Device Role / Timing Role: Core integrator element with precision capacitor feedback; relies on low input bias current (<200 nA) for linear ramp slope. Use Value: Internal compensation and 1 MHz GBP enable predictable integration time constants up to ~100 μs without oscillation. | Use Scenario: Implementing voltage-mode error amplifiers in isolated DC-DC converter feedback loops. IC Role / Device Role / Timing Role: Compares sensed output voltage against reference and drives optocoupler LED to regulate primary-side controller. Use Value: ±22 V supply tolerance accommodates wide input ranges in industrial 24 V and 48 V systems while maintaining loop stability. |
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 SO-8 pinout; input offset voltage spec slightly looser (2–7.5 mV) | Same use cases but lower production consistency in offset drift over temperature | Select when TI supply chain preference or dual-sourcing strategy applies |
| NE5532DR | Higher slew rate (9 V/μs), lower noise (5 nV/√Hz), dual-channel; no internal compensation | Requires external compensation; unsuitable for uncompensated legacy designs | Choose only for new high-fidelity audio or wideband signal paths where performance justifies redesign |
Compared with LM741CDR, UA741IDT offers tighter offset voltage control and better thermal stability over -40 °C to +105 °C; versus NE5532DR, it trades bandwidth and noise performance for plug-and-play stability and industrial temperature range compliance.
Availability
UA741IDT is available at Aetrix Electronics and suitable for industrial sensor interfaces, test equipment signal chains, and legacy analog subsystems requiring stable component supply and long-term obsolescence management.
Supply support for UA741IDT 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 UA741 series belongs to ST's legacy analog portfolio, engineered for robustness, ease of use, and backward compatibility in cost-sensitive, non-critical analog signal processing applications.
FAQ
What is the maximum operating junction temperature for UA741IDT?
The absolute maximum junction temperature is not explicitly specified, but the device is rated for operation from −40 °C to +105 °C ambient. With θJA = 125 °C/W and maximum supply current of 3.3 mA at ±15 V, power dissipation remains below 100 mW-keeping junction temperature safely within silicon limits under standard PCB layout conditions.
Can UA741IDT operate from a single supply?
Yes-UA741IDT supports single-supply operation from 10 V to 40 V. Its input common-mode range extends to within 2 V of the negative rail, and output can swing to within ~2 V of either rail. For proper biasing, the non-inverting input must be referenced to a mid-rail voltage (e.g., via resistor divider) to avoid saturation.
Why does Pin 8 show "N.C." and what happens if it is grounded?
Pin 8 is internally unconnected per ST's datasheet and must remain floating. Grounding or connecting it to any potential risks unpredictable behavior-including increased input offset, reduced CMRR, or oscillation-due to parasitic coupling into the die substrate. No functional benefit or specification guarantee exists for any connection to Pin 8.
How does UA741IDT compare to modern rail-to-rail op-amps?
UA741IDT does not support rail-to-rail input or output: its input range stops 2–3 V short of each rail, and output swing is limited to ±10 V into 2 kΩ. Modern rail-to-rail op-amps offer wider dynamic range and lower power, but UA741IDT retains value in legacy designs where stability, proven reliability, and exact pin compatibility outweigh raw performance metrics.
UA741IDT 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:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA741IDT FAQ
1.How can I place an order for UA741IDT through Aetrix?
Please submit a Request for Quotation (RFQ) for UA741IDT 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 UA741IDT reliable?
The price and inventory of UA741IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA741IDT is usually 5 days.
3.What payment methods are accepted for UA741IDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA741IDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA741IDT?
UA741IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA741IDT 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 UA741IDT?
For technical support, including UA741IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA741IDT requirements.
6.How does Aetrix verify that UA741IDT is sourced from the original manufacturer or authorized distributors?
All UA741IDT 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 UA741IDT meets industry standards.
7.What is the process for return or replacement of UA741IDT?
All UA741IDT units undergo pre-shipment inspection (PSI). If there is an issue with UA741IDT, 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 UA741IDT part is unused and in its original packaging.
Return procedure for UA741IDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UA741IDT Tags
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