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STMicroelectronics UA748CN
- Part No.:
- UA748CN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
UA748CN.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,436
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Product details
Overview
UA748CN from STMicroelectronics is a precision single operational amplifier in an 8-pin plastic DIP package, featuring ±5V to ±15V dual-supply operation, 3 mV max input offset voltage over temperature, 0.5 MHz gain-bandwidth product, and built-in short-circuit protection. It serves as a general-purpose op-amp in analog signal conditioning circuits for industrial sensor interfaces and DC-coupled amplification stages.
For engineers reviewing the UA748CN datasheet, UA748CN pinout, UA748CN application, or UA748CN equivalent, key selection considerations include its unity-gain stable compensation, ±30V differential input capability, offset null terminals, no-latch-up behavior beyond common-mode range, and thermal drift performance of 3–30 µV/°C across grade variants.
Technical Context
The UA748CN uses internal single-pole frequency compensation (via external 30 pF capacitor on Pin 1/5), enabling unconditional stability at unity gain while allowing optimization for higher slew rate in inverting configurations. Its input stage employs matched transistors with tight thermal coupling to minimize offset drift.
It supports rail-to-rail input common-mode range up to ±15 V with ±20 V supply, delivers ±12 V output swing into 10 kΩ, and maintains CMRR and PSRR ≥70 dB across temperature. No latch-up occurs even when common-mode voltage exceeds rails - a critical feature for fault-tolerant front-end designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | Max 3 mV at +25°C and full temp range - enables accurate DC amplification without frequent trimming. |
| Supply Voltage Range | ±5 V to ±15 V - supports standard bipolar analog rails; absolute max ±22 V allows margin for transient spikes. |
| Gain-Bandwidth Product | 0.5 MHz - suitable for low-frequency instrumentation, filtering, and sensor signal conditioning up to ~50 kHz. |
| Slew Rate | 0.25–0.5 V/µs - limits large-signal response but ensures stability with capacitive loads and avoids ringing. |
| Common-Mode Input Range | ±15 V at ±20 V supply - permits direct connection to high-voltage sensors without level-shifting circuitry. |
| Output Short-Circuit Current | 10–50 mA - provides robust fault tolerance; continuous safe operation under output shorts. |
| Input Bias Current | 25–300 nA - low enough for high-impedance source interfacing (e.g., thermocouples, photodiodes). |
Pinout & Package
UA748CN is housed in an 8-pin plastic dual in-line package (DIP8) per JEDEC MS-001, with 0.3″ wide body and 2.54 mm lead pitch. Thermal resistance θJA ≈ 70°C/W enables operation up to +70°C ambient without heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null / Compensation | Connects to external 30 pF capacitor for unity-gain stability; also used with potentiometer for offset trimming. |
| 2 | Inverting Input | Differential input node; accepts feedback network for closed-loop gain configuration. |
| 3 | Non-inverting Input | Differential input node; referenced to ground or bias network for single-ended signal injection. |
| 4 | VCC− | Negative supply rail connection; must be decoupled locally to reduce noise coupling. |
| 5 | Offset Null 2 | Second terminal of offset null potentiometer; paired with Pin 1 for manual Vos adjustment. |
| 6 | Output | Class-A/B output stage; capable of ±12 V swing into 10 kΩ and continuous short-circuit current limiting. |
| 7 | VCC+ | Positive supply rail connection; requires local 0.1 µF ceramic decoupling capacitor. |
| 8 | Frequency Compensation | Alternative compensation node; used with Pin 1 for dominant-pole setting in non-standard configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable internal compensation | Guarantees stability with any resistive feedback network and up to 100 pF capacitive load without oscillation. |
| Offset voltage null capability | Two dedicated pins (1 & 5) allow precise DC offset cancellation using a 10 kΩ potentiometer - essential for precision integrators. |
| No latch-up under overvoltage | Operates safely even when input common-mode voltage exceeds supply rails - eliminates need for clamping diodes in ruggedized inputs. |
| Continuous short-circuit protection | Internal current limiting sustains infinite-duration output shorts at ±15 V supply without damage or parameter shift. |
| Wide differential input voltage range | ±30 V differential rating enables direct interface with high-voltage transducers and legacy industrial signal sources. |
Applications
| Industrial Sensor Signal Conditioning | DC-Coupled Precision Amplifier |
|---|---|
Use Scenario: Amplifying low-level outputs from strain gauges, RTDs, or thermocouples in PLC analog input modules. IC Role / Device Role / Timing Role: Primary DC-stable gain block with offset trimming and rail-compatible input range. Use Value: 3 mV max Vos and <30 µV/°C drift ensure ≤0.1% measurement error over 0–70°C without recalibration. | Use Scenario: Building zero-drift integrators and active filters in data acquisition front-ends. IC Role / Device Role / Timing Role: Low-drift, unity-gain stable op-amp with null pins for long-term baseline stability. Use Value: Offset null terminals and matched input transistors enable sub-mV baseline hold over hours of operation. |
| High-Voltage Comparator Interface | Ruggedized Analog Front-End |
Use Scenario: Converting ±24 V industrial logic signals to TTL/CMOS levels in motor control I/O isolation stages. IC Role / Device Role / Timing Role: Differential comparator with hysteresis, leveraging ±30 V input rating and no-latch-up behavior. Use Value: Eliminates external voltage dividers and protection diodes - reduces BOM count and improves ESD robustness. | Use Scenario: Protecting downstream ADCs from field-induced transients in factory automation equipment. IC Role / Device Role / Timing Role: Fault-tolerant buffer amplifier with rail-to-rail input and short-circuit survival. Use Value: Continuous short-circuit protection and ±22 V abs-max supply withstand prevent field failures during wiring faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM741CN | Higher input offset (6 mV max), no offset null pins, lower CMRR (70 dB min), same DIP8 footprint. | Lacks precision trimming capability; unsuitable for sub-mV DC gain stages. | Choose only if cost sensitivity outweighs offset and drift requirements. |
| TL081CP | JFET-input (lower Iib = 30 pA), higher GBP (3 MHz), no short-circuit protection, no offset null. | Better for high-Z sources but vulnerable to output shorts; requires external protection. | Select when input impedance >10 MΩ is mandatory and fault conditions are controlled. |
Compared with LM741CN and TL081CP, UA748CN uniquely combines offset trimmability, ±30 V differential input tolerance, and intrinsic short-circuit survivability - making it optimal for unattended industrial analog signal chains where calibration stability and fault resilience are co-required.
Availability
UA748CN is available at Aetrix Electronics and suitable for industrial sensor interfaces, analog front-ends, and precision DC amplifiers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UA748CN 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The UA748 belongs to ST's legacy precision analog amplifier family, engineered specifically for reliability-critical industrial instrumentation where offset stability, fault tolerance, and long-term parametric consistency are prioritized over speed or ultra-low power.
FAQ
What is the recommended external compensation capacitor value for unity-gain stability?
The UA748CN requires a 30 pF capacitor between Pins 1 and 8 (or Pins 1 and 5 depending on configuration) for guaranteed unity-gain stability. This value is specified in the datasheet and validated across temperature and process corners. Using larger values degrades bandwidth unnecessarily; smaller values risk peaking or oscillation under capacitive loads.
Can UA748CN operate with a single supply?
No - the UA748CN is designed exclusively for dual-supply operation (±5 V to ±15 V). Its input common-mode and output swing specifications assume symmetric rails. Single-supply use violates absolute maximum ratings and causes clipping, distortion, or undefined behavior. For single-supply applications, consider ST's TS912 or TSV91x series.
Does UA748CN support rail-to-rail input or output?
It supports rail-to-rail input common-mode range (±15 V at ±20 V supply) but not rail-to-rail output: typical swing is ±12 V into 10 kΩ with ±15 V supplies. Output does not reach either rail due to internal saturation margins. True rail-to-rail output requires modern CMOS op-amps like the TSX912.
How is offset voltage adjusted on UA748CN?
Offset is trimmed using a 10 kΩ potentiometer: its wiper connects to Pin 1, one end to Pin 5, and the other end to VCC− (Pin 4). Adjusting the potentiometer applies opposing currents to the input stage, canceling Vos. This method achieves sub-millivolt residual offset and is stable over time and temperature when using a cermet trimmer.
UA748CN 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:
- 70 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 1.8mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
UA748CN FAQ
1.How can I place an order for UA748CN through Aetrix?
Please submit a Request for Quotation (RFQ) for UA748CN 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 UA748CN reliable?
The price and inventory of UA748CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA748CN is usually 5 days.
3.What payment methods are accepted for UA748CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA748CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA748CN?
UA748CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA748CN 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 UA748CN?
For technical support, including UA748CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA748CN requirements.
6.How does Aetrix verify that UA748CN is sourced from the original manufacturer or authorized distributors?
All UA748CN 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 UA748CN meets industry standards.
7.What is the process for return or replacement of UA748CN?
All UA748CN units undergo pre-shipment inspection (PSI). If there is an issue with UA748CN, 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 UA748CN part is unused and in its original packaging.
Return procedure for UA748CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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