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STMicroelectronics UA748IN
- Part No.:
- UA748IN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
UA748IN.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,209
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Product details
Overview
UA748IN from STMicroelectronics is a precision single operational amplifier with ±5V to ±15V dual-supply operation, 3 mV max input offset voltage over temperature, 0.5 MHz gain-bandwidth product, and continuous short-circuit protection - used in analog signal conditioning for industrial sensor interfaces and precision DC amplification.
For engineers reviewing the UA748IN datasheet, UA748IN pinout, UA748IN application, or UA748IN equivalent, key selection considerations include its unity-gain stable compensation, ±30 V differential input capability, offset null terminals, wide operating temperature range (–40°C to +105°C), and DIP-8/SO-8 package compatibility with legacy LM101A designs.
Technical Context
The UA748IN implements a single-pole internal compensation network optimized for unity-gain stability with a 30 pF external capacitor, enabling robust operation with capacitive loads. Its input stage uses matched transistors on a monolithic die to achieve low input offset drift (≤15 µV/°C) and tight thermal coupling.
It supports rail-to-rail common-mode input range up to ±15 V at ±20 V supply, delivers ±12 V output swing into 10 kΩ, and features no latch-up behavior when common-mode limits are exceeded - critical for high-voltage transducer interfacing and comparator use with differential inputs up to ±30 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 3 mV max over full temperature range - ensures ≤±30 mV DC error in 10× gain stages without trimming. |
| Gain-Bandwidth Product | 0.5 MHz - supports stable closed-loop bandwidth up to ~50 kHz at gain = 10. |
| Slew Rate | 0.5 V/µs - limits large-signal response time to ≥20 µs for 10 V step, suitable for DC and low-frequency AC signals. |
| Supply Voltage Range | ±5 V to ±15 V - enables direct interface with ±12 V or ±15 V industrial power rails. |
| Common-Mode Input Range | ±15 V at ±20 V supply - allows direct connection to high-side current sense or bridge sensor outputs. |
| Output Short-Circuit Current | 50 mA - provides inherent fault tolerance without external current limiting in transient overload conditions. |
| Input Bias Current | 75 nA typ. - permits use with high-impedance sources (e.g., pH electrodes, piezoelectric sensors) without significant loading error. |
Pinout & Package
UA748IN is supplied in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard through-hole footprint. Pin 1 and Pin 5 provide offset null adjustment via external potentiometer; Pin 8 accepts the 30 pF frequency compensation capacitor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to one end of 10 kΩ potentiometer for manual input offset trimming. |
| 2 | Inverting Input | Accepts feedback signal in inverting amplifier configurations; high-impedance node (1.5 MΩ). |
| 3 | Non-inverting Input | Reference input for non-inverting gain stages; same impedance and noise performance as Pin 2. |
| 4 | VCC− | Negative supply rail connection; must be decoupled near device for stability. |
| 5 | Offset Null 2 | Connects to other end of 10 kΩ potentiometer; forms balanced nulling network with Pin 1. |
| 6 | Output | Class-A output stage capable of ±12 V swing into 10 kΩ; drives capacitive loads directly. |
| 7 | VCC+ | Positive supply rail connection; shares same decoupling requirement as Pin 4. |
| 8 | Frequency Compensation | Connects external 30 pF capacitor to ground to ensure unity-gain stability. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable internal compensation | Enables reliable operation in follower, integrator, and active filter topologies without external phase compensation. |
| Differential input voltage rating | ±30 V - allows safe use as a comparator with high-voltage differential signals (e.g., motor phase sensing). |
| No latch-up under overvoltage | Prevents destructive failure when input exceeds supply rails - essential for rugged industrial environments. |
| Offset voltage null capability | Two dedicated pins enable precise DC calibration down to sub-millivolt level in production test or field adjustment. |
| Continuous short-circuit protection | Internally limits output current to 50 mA indefinitely - eliminates need for external foldback circuitry. |
Applications
| Industrial Sensor Signal Conditioning | Precision DC Amplifier |
|---|---|
Use Scenario: Amplifying low-level mV outputs from strain gauges and RTDs in PLC analog input modules. IC Role / Device Role / Timing Role: Primary DC-coupled gain stage with offset trimming and thermal drift compensation. Use Value: 3 mV max offset and ≤15 µV/°C drift minimize calibration frequency and maintain accuracy across –40°C to +105°C ambient. | Use Scenario: Building programmable gain instrumentation amplifiers for test equipment front ends. IC Role / Device Role / Timing Role: Fixed-gain buffer or difference amplifier with matched input impedance and high CMRR (96 dB). Use Value: 96 dB CMRR and 80 dB SVR reject power supply ripple and common-mode noise in noisy factory environments. |
| High-Voltage Comparator | Analog Front-End for Legacy Systems |
Use Scenario: Monitoring overvoltage/undervoltage thresholds in ±15 V power supplies for telecom line cards. IC Role / Device Role / Timing Role: Open-loop comparator with differential inputs referenced to system ground or floating nodes. Use Value: ±30 V differential input rating and no latch-up allow direct connection to unregulated rails without clamping diodes. | Use Scenario: Replacing LM101A in legacy military and aerospace analog subsystems requiring long-term component continuity. IC Role / Device Role / Timing Role: Drop-in functional replacement with identical pinout and improved temperature range (–40°C to +105°C vs. 0°C to +70°C). Use Value: Same DIP-8 footprint and offset null configuration simplify redesign while extending operational envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM301AN | Higher input offset (6 mV max), no built-in short-circuit protection, requires external compensation. | Limited to lower-reliability commercial-grade systems; lacks robustness for industrial continuous operation. | Choose only if cost sensitivity outweighs reliability and thermal stability requirements. |
| OP07CP | Lower offset (25 µV typ.), chopper-stabilized architecture, higher supply current (1.6 mA), no offset null pins. | Better DC precision but unsuitable where manual calibration or high-voltage differential inputs are needed. | Select when ultra-low drift dominates design priorities and ±30 V differential input is not required. |
Compared with LM301AN and OP07CP, UA748IN uniquely balances moderate DC precision, high-voltage differential input tolerance, built-in fault protection, and user-adjustable offset - making it optimal for industrial analog signal chains where robustness and serviceability matter.
Availability
UA748IN is available at Aetrix Electronics and suitable for industrial sensor interfaces, precision DC amplification, high-voltage comparators, and legacy analog subsystem replacements requiring stable component supply across extended temperature ranges.
Supply support for UA748IN 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The UA748IN belongs to ST's legacy precision op-amp product line, engineered specifically for high-reliability analog signal conditioning in harsh-temperature industrial environments and backward-compatible upgrades of classic linear circuits.
FAQ
What is the maximum supply voltage for UA748IN?
The absolute maximum supply voltage is ±22 V per the datasheet. Operation at ±15 V is recommended for reliable long-term performance with 50 mW typical power dissipation. Exceeding ±22 V risks permanent damage to the input stage and output transistors.
Can UA748IN be used as a comparator?
Yes - its differential input voltage rating of ±30 V and lack of phase inversion during overdrive make it suitable for open-loop comparator use. However, propagation delay is not specified, so timing-critical applications require empirical validation.
Does UA748IN require external frequency compensation?
Yes - a 30 pF capacitor must be connected between Pin 8 and ground for unity-gain stability. Omitting it causes oscillation in follower or low-gain configurations; values outside 25–35 pF may degrade phase margin or slew rate.
Is there a surface-mount version of UA748IN?
Yes - UA748ID is the SO-8 surface-mount variant, sharing identical electrical specifications and pinout. It is offered in tape-and-reel packaging (UA748IDT) for automated assembly and operates across the same –40°C to +105°C temperature range.
UA748IN 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:
- 25 nA
- Voltage - Input Offset:
- 700 µV
- Current - Supply:
- 1.8mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
UA748IN FAQ
1.How can I place an order for UA748IN through Aetrix?
Please submit a Request for Quotation (RFQ) for UA748IN 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 UA748IN reliable?
The price and inventory of UA748IN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA748IN is usually 5 days.
3.What payment methods are accepted for UA748IN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA748IN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA748IN?
UA748IN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA748IN 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 UA748IN?
For technical support, including UA748IN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA748IN requirements.
6.How does Aetrix verify that UA748IN is sourced from the original manufacturer or authorized distributors?
All UA748IN 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 UA748IN meets industry standards.
7.What is the process for return or replacement of UA748IN?
All UA748IN units undergo pre-shipment inspection (PSI). If there is an issue with UA748IN, 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 UA748IN part is unused and in its original packaging.
Return procedure for UA748IN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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