My Inquiry
My Account
STMicroelectronics UA748CDT
- Part No.:
- UA748CDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA748CDT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,601
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UA748CDT from STMicroelectronics is a precision single operational amplifier with 3 mV max input offset voltage (over temperature), ±15 V supply operation, 0.5 MHz gain-bandwidth product, 0.5 V/µs slew rate, and continuous 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 UA748CDT datasheet, UA748CDT pinout, UA748CDT application, or UA748CDT equivalent, key selection considerations include its unity-gain stable compensation, ±30 V differential input capability, offset null terminals, wide common-mode range (±15 V at ±20 V supplies), and SO-8 package thermal performance across 0°C to +70°C.
Technical Context
The UA748CDT uses internal single-pole frequency compensation optimized for unity-gain stability with a 30 pF external capacitor, enabling robust operation with capacitive loads. Its input stage features matched transistors on a single die for low drift and fast thermal recovery.
It supports rail-to-rail input common-mode voltage up to ±15 V with ±20 V supplies and delivers ±12 V output swing into 10 kΩ at ±15 V. The device avoids latch-up when common-mode limits are exceeded and operates as a comparator 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 minimal DC error in precision amplification paths |
| Supply Voltage Range | ±5 V to ±15 V - enables compatibility with legacy bipolar analog systems |
| Gain-Bandwidth Product | 0.5 MHz - supports stable closed-loop gain up to ~50 at 10 kHz |
| Slew Rate | 0.5 V/µs - limits large-signal bandwidth to ~160 kHz for 3 Vpp output |
| Input Common-Mode Range | ±15 V at ±20 V supply - allows direct interfacing with high-voltage sensors |
| Output Short-Circuit Current | 10–50 mA - provides robust fault tolerance without external current limiting |
| Power Dissipation | 50 mW at ±15 V - enables compact SO-8 packaging without forced cooling |
Pinout & Package
UA748CDT is housed in an 8-pin plastic micropackage (SO-8), compliant with JEDEC MS-012, with gull-wing leads and 1.27 mm pitch. Thermal resistance (RθJA) is 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to one end of external potentiometer for input offset trimming |
| 2 | Inverting Input | Differential input node for negative feedback configuration |
| 3 | Non-inverting Input | Differential input node referenced to ground or bias network |
| 4 | VCC− | Negative supply rail connection - must be decoupled near pin |
| 5 | Offset Null 2 | Connects to other end of external potentiometer for balanced nulling |
| 6 | Output | Class-A output stage capable of ±12 V swing into 10 kΩ |
| 7 | VCC+ | Positive supply rail connection - requires local 100 nF ceramic decoupling |
| 8 | Frequency Compensation | Connection point for 30 pF capacitor to set dominant pole for unity-gain stability |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable compensation | Guarantees stability with 30 pF external capacitor - eliminates need for complex compensation networks |
| Offset voltage null capability | Dual null pins (1 & 5) enable <100 µV residual offset after trimming - critical for DC-coupled instrumentation |
| Continuous short-circuit protection | Internal current limiting sustains infinite-duration output shorts - prevents thermal runaway in fault conditions |
| No latch-up under overvoltage | Operates safely even when common-mode input exceeds rails - simplifies front-end design for noisy environments |
| Wide differential input range | ±30 V differential input rating - supports comparator use without external attenuators |
Applications
| Industrial Sensor Signal Conditioning | DC-Coupled Amplifier Stage |
|---|---|
Use Scenario: Amplifying low-level mV outputs from strain gauges and RTDs in PLC analog input modules. IC Role / Device Role / Timing Role: Precision DC amplifier with offset nulling and rail-compatible input range. Use Value: 3 mV max offset and <30 µV/°C drift ensure ≤0.1% full-scale error over 0–70°C ambient. | Use Scenario: Building a unity-gain buffer between high-impedance pH probe and ADC driver stage. IC Role / Device Role / Timing Role: Low-bias-current buffer with 1.5 MΩ input impedance and ±15 V CMVR. Use Value: Prevents probe loading and maintains accuracy despite varying electrode potentials up to ±10 V. |
| Legacy Analog Test Equipment | Comparator with Hysteresis |
Use Scenario: Replacing obsolete LM101A in calibrated function generators and waveform shapers. IC Role / Device Role / Timing Role: Pin-compatible general-purpose op-amp with identical DIP/SO footprint. Use Value: Same pinout and electrical behavior enables drop-in replacement without PCB redesign. | Use Scenario: Implementing window comparator for overvoltage detection in power supply supervision. IC Role / Device Role / Timing Role: Dual-supply comparator with ±30 V differential input tolerance. Use Value: Eliminates need for input scaling resistors when monitoring ±24 V rails directly. |
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 | Lacks integrated protection and nulling convenience - increases BOM count and layout complexity | Prefer UA748CDT where reliability and ease of trimming are required |
| TL081CD | JFET-input (lower Iib = 30 pA), higher GBP (3 MHz), but no offset null pins and no ±30 V differential rating | Better for high-Z sources but unsuitable for comparator use or high-differential-voltage sensing | Choose UA748CDT for mixed analog/comparator roles and DC precision; TL081CD only for AC-coupled, high-impedance cases |
Compared with LM301AN and TL081CD, the UA748CDT uniquely combines offset nulling, ±30 V differential input tolerance, and intrinsic short-circuit protection - making it optimal for ruggedized industrial analog front-ends where DC accuracy and fault resilience are jointly critical.
Availability
UA748CDT is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy equipment repair, analog test instrumentation, and DC-coupled amplifier designs requiring stable component supply across extended temperature ranges.
Supply support for UA748CDT 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 for reliability in industrial control systems and backward-compatible replacements where long-term availability and proven thermal stability are essential.
FAQ
What is the recommended external compensation capacitor value for UA748CDT?
The UA748CDT requires a 30 pF capacitor between Pin 8 (frequency compensation) and Pin 4 (VCC−) for guaranteed unity-gain stability. This value is specified in the datasheet and validated across temperature and process variations. Using larger values reduces bandwidth further; smaller values may cause peaking or oscillation in high-gain configurations.
Can UA748CDT operate from a single supply?
No - UA748CDT is a dual-supply op-amp designed for symmetric ±5 V to ±15 V operation. It lacks rail-to-rail input/output architecture and has no internal level-shifting. Single-supply use would violate absolute maximum ratings and result in undefined output behavior or damage.
Does UA748CDT support output short-circuit protection indefinitely?
Yes - the datasheet specifies "continuous short-circuit protection" with infinite duration under normal operating conditions (TA ≤ +70°C). Internal current limiting holds output current between 10 mA and 50 mA during shorts, preventing junction overheating when ambient temperature remains within the rated range.
How does the offset null circuit work on UA748CDT?
Pin 1 and Pin 5 connect to opposite ends of an external 10 kΩ potentiometer; the wiper connects to VCC−. Adjusting the potentiometer injects opposing currents into the input stage to cancel inherent transistor mismatches. This trims input offset voltage to <100 µV at room temperature and improves long-term DC stability in precision amplifiers.
UA748CDT 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA748CDT FAQ
1.How can I place an order for UA748CDT through Aetrix?
Please submit a Request for Quotation (RFQ) for UA748CDT 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 UA748CDT reliable?
The price and inventory of UA748CDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA748CDT is usually 5 days.
3.What payment methods are accepted for UA748CDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA748CDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA748CDT?
UA748CDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA748CDT 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 UA748CDT?
For technical support, including UA748CDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA748CDT requirements.
6.How does Aetrix verify that UA748CDT is sourced from the original manufacturer or authorized distributors?
All UA748CDT 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 UA748CDT meets industry standards.
7.What is the process for return or replacement of UA748CDT?
All UA748CDT units undergo pre-shipment inspection (PSI). If there is an issue with UA748CDT, 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 UA748CDT part is unused and in its original packaging.
Return procedure for UA748CDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UA748CDT Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
