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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments UA748CD

Name: UA748CD
Brand: Texas Instruments
SKU: UA748CD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UA748CD

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: UA748CD.pdf

Description:: IC OPAMP GP 1 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:48,525

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Product details

Overview

UA748CD from STMicroelectronics is a precision single operational amplifier in SOIC-8 package, featuring 3 mV max input offset voltage (over temperature), ±15 V supply operation, 0.5 MHz gain-bandwidth product, 0.25 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.

For engineers reviewing the UA748CD datasheet, UA748CD pinout, UA748CD application, or UA748CD equivalent, key selection criteria include its unity-gain stable compensation, ±30 V differential input capability, offset null terminals, no latch-up behavior beyond common-mode range, and SOIC-8 thermal performance in 0°C to +70°C ambient systems.

Technical Context

The UA748CD uses internal single-pole frequency compensation with external 30 pF capacitor (C1) for unity-gain stability across all feedback configurations, including capacitive loads. Its input stage supports ±30 V differential voltage and wide common-mode range (±15 V at ±20 V supplies), enabling robust operation in noisy industrial environments.

It features dual offset-null terminals (pins 1 and 5), allowing precise trimming of input offset voltage in high-accuracy DC-coupled amplifiers. The device avoids latch-up even when common-mode voltage exceeds rails, and delivers 10–50 mA short-circuit output current with infinite duration rating.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Offset Voltage	3 mV max over full temperature range - ensures ≤3 mV DC error in precision gain stages without trimming
Supply Voltage Range	±5 V to ±15 V - supports standard bipolar rail systems and simplifies power design in analog front-ends
Gain-Bandwidth Product	0.5 MHz - sets usable small-signal bandwidth for low-frequency instrumentation (<50 kHz closed-loop)
Slew Rate	0.25 V/µs - limits full-power bandwidth to ~40 kHz at ±10 V swing; adequate for sensor signal buffering
Common-Mode Input Range	±15 V at ±20 V supply - enables direct interfacing to ±10 V industrial sensors without level-shifting
Output Short-Circuit Current	10–50 mA - provides inherent fault tolerance in transducer driver and actuator interface circuits
Input Bias Current	25–300 nA - allows use with high-impedance sources (e.g., pH electrodes, piezoresistive bridges)

Pinout & Package

UA748CD is housed in an 8-pin plastic micropackage (SOIC-8), compliant with JEDEC MS-012, with 1.27 mm pitch and 5.0 mm × 6.2 mm body dimensions. Thermal resistance (θ_JA) is 150°C/W, suitable for ambient operation up to +70°C without forced airflow.

Pin/Terminal	Circuit Role	Design Meaning
1	Offset Null 1	Connects to potentiometer wiper for manual V_io adjustment in precision DC amplifiers
2	Inverting Input	Accepts feedback network input; supports stable operation with capacitive loads due to internal compensation
3	Non-inverting Input	High-impedance node (1.5–4 MΩ) for reference or sensor signal routing
4	V_CC−	Negative supply rail connection; must be decoupled locally to suppress ground bounce
5	Offset Null 2	Completes nulling circuit with Pin 1; required for sub-mV offset calibration
6	Output	Capable of ±10 V swing into 2 kΩ load; drives ADC inputs or low-power actuators directly
7	V_CC+	Positive supply rail connection; shares same decoupling best practice as Pin 4
8	Frequency Compensation	External 30 pF capacitor connection point for unity-gain stability; not used in compensated variants

Key Features

Feature	Design Value
No latch-up beyond common-mode range	Enables safe operation during power sequencing or transient overvoltage events without destructive failure
Continuous short-circuit protection	Allows indefinite output shorting without thermal shutdown or parameter shift-critical for field-deployed equipment
Differential input voltage up to ±30 V	Permits direct connection to high-voltage sensor outputs (e.g., strain gauge bridges with excitation >10 V)
Offset voltage null capability	Supports <1 mV system-level DC accuracy after calibration-essential for 12-bit+ data acquisition systems
Unity-gain stable with external capacitor	Eliminates need for complex compensation networks; simplifies layout in low-frequency closed-loop designs

Applications

Industrial Sensor Signal Conditioning

DC Motor Current Sensing

Use Scenario: Amplifying low-level mV outputs from RTDs, thermocouples, or load cells in PLC analog input modules.

IC Role / Device Role / Timing Role: Precision DC-coupled non-inverting amplifier with offset nulling for 0.1% linearity over –20°C to +60°C.

Use Value: 3 mV max V_io and 3 µV/°C drift enable <0.5% total error without auto-zero circuitry.

Use Scenario: Isolating and scaling shunt voltage in H-bridge motor drivers for current feedback control.

IC Role / Device Role / Timing Role: High-common-mode difference amplifier front-end (with external resistors) rejecting bus noise up to ±30 V.

Use Value: ±30 V differential input rating eliminates need for additional attenuators or isolation amplifiers.

Programmable Logic Controller (PLC) Analog Outputs

Legacy Test Equipment Calibration Circuits

Use Scenario: Buffering and level-shifting DAC outputs to drive ±10 V industrial actuators.

IC Role / Device Role / Timing Role: Unity-gain buffer with rail-to-rail compatible output swing (±12 V into 10 kΩ).

Use Value: 0.25 V/µs slew rate and 0.5 MHz GBW ensure monotonic step response for 100 Hz update rates.

Use Scenario: Replacing obsolete LM101A in calibration standards requiring long-term DC stability.

IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement with identical offset null and compensation pinout.

Use Value: Same DIP/SO footprint and electrical specs allow retrofit without PCB redesign.

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision operational amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM301AN	Higher input offset voltage (5 mV max), no built-in short-circuit protection, requires external compensation	Lacks continuous short-circuit rating and offset null pins - unsuitable for unattended field equipment	Prefer UA748CD where fault resilience and trimmable DC accuracy are mandatory
TL081CP	JFET-input (lower I_ib = 30 pA), higher slew rate (13 V/µs), but no offset null pins or ±30 V differential rating	Better for high-Z AC-coupled circuits; cannot replace UA748CD in DC-coupled ±30 V input scenarios	Select TL081CP only when input bias current dominates design constraints and offset trimming is unnecessary

Compared with LM301AN and TL081CP, UA748CD uniquely combines offset nulling, ±30 V differential input tolerance, and intrinsic short-circuit protection-making it the only choice for ruggedized, trimmable DC signal paths in industrial control hardware.

Availability

UA748CD is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable logic controller (PLC) analog I/O modules, and legacy test equipment calibration circuits requiring stable component supply across extended production lifecycles.

Supply support for UA748CD 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 op-amp product line, engineered specifically for reliability-critical analog signal conditioning in industrial automation and measurement instrumentation.

FAQ

What is the maximum allowable supply voltage for UA748CD?

The absolute maximum supply voltage is ±22 V per the datasheet. However, recommended operating range is ±5 V to ±15 V. Operation above ±15 V increases power dissipation and junction temperature, potentially exceeding the 150°C max T_j limit unless thermal management is enhanced.

Does UA748CD require an external compensation capacitor?

Yes - UA748CD uses external single-pole compensation via a 30 pF capacitor between Pin 8 (compensation) and Pin 4 (V_CC−). This configuration ensures unity-gain stability with capacitive loads and is mandatory for specified performance; omitting it risks oscillation.

Can UA748CD operate as a comparator?

Yes - the datasheet explicitly states it operates as a comparator with differential inputs up to ±30 V. However, propagation delay is not characterized, and output saturation recovery time is slow (~10 µs); it is suitable only for low-speed, high-voltage threshold detection-not high-speed digital interfacing.

Is UA748CD pin-compatible with LM101A?

Yes - the UA748CD shares identical pinout, offset null terminals (Pins 1 & 5), and compensation terminal (Pin 8) with LM101A. This enables direct replacement in legacy designs without PCB modification, though UA748CD adds improved short-circuit protection and wider temperature range.

UA748CD Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

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:: 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

UA748CD FAQ

1.How can I place an order for UA748CD through Aetrix?

Please submit a Request for Quotation (RFQ) for UA748CD 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 UA748CD reliable?

The price and inventory of UA748CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA748CD is usually 5 days.

3.What payment methods are accepted for UA748CD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA748CD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UA748CD?

UA748CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UA748CD 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 UA748CD?

For technical support, including UA748CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA748CD requirements.

6.How does Aetrix verify that UA748CD is sourced from the original manufacturer or authorized distributors?

All UA748CD 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 UA748CD meets industry standards.

7.What is the process for return or replacement of UA748CD?

All UA748CD units undergo pre-shipment inspection (PSI). If there is an issue with UA748CD, 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 UA748CD part is unused and in its original packaging.

Return procedure for UA748CD:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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