RC4558 Dual General-Purpose Operational Amplifier: Pinout, Datasheet and Replacement

The RC4558 is a versatile dual general-purpose operational amplifier (op-amp) that finds applications across various electronic circuits. In this article, we will explore the RC4558 operational amplifier, discussing its pinout, features, datasheet, replacements, and more details.

What is RC4558 OP-Amp?

The RC4558 serves as a dual-packaged alternative to the widely used LM741 Operational Amplifier (Op-Amp). Each of its two sections closely mirrors the LM741, save for the absence of offset and null adjustments. The RC4558 Op-Amp boasts a generous common-mode input voltage range of ±14V, permitting the inverting and non-inverting pins to operate within this limit, provided they stay below the operational voltage.

This expansive common-mode input voltage range and the absence of latch-up issues make this amplifier exceptionally well-suited for voltage-follower applications. Additionally, it features built-in internal frequency compensation and short-circuit protection, ensuring stability without the need for external components. Consequently, it demands a minimal number of components to be application-ready. Due to these attributes, these integrated circuits (ICs) are commonly employed in DVD players and guitar amplifiers. You may also encounter Geiger counter circuits and audio amplifiers or comparator circuits designed around this IC. It's worth noting that, as the RC4558 Op-Amp belongs to the older 1485 Op-Amp series, its specifications are not as impressive as those of modern Op-Amps. It comes at a lower cost and consumes very little current, but it may exhibit some quality-related drawbacks, manifesting as slow and imprecise performance. However, it's essential to keep in mind that contemporary Op-Amps like the OPA2134 consume two to four times more current compared to the RC4558.

RC4558 Pinout

Pin Configuration

Pin No.	Pin Name	Type	Description
1	1OUT	O	Output
2	1IN-	I	Inverting Input
3	1IN+	I	Noninverting input
4	VCC-	-	Negative Supply
5	2IN+	I	Noninverting input
6	2IN-	I	Inverting Input
7	2OUT	O	Output
8	VCC+	-	Positive Supply

RC4558 Features

The RC4558 is a versatile dual operational amplifier chip commonly used in electronics. It offers short-circuit protection for its outputs and includes internal frequency compensation, ensuring stability without the need for external components. Its specified operating range extends from -15V to +15V.

Here are some key features:

• Low Power Consumption: It consumes only 6.5mA of supply current, making it energy-efficient.

• Wide Common Mode Input Voltage Range: Typically, it can handle common-mode input voltages within the range of ±14V.

• Excellent Common-Mode Rejection Ratio: It exhibits a remarkable 90 dB common-mode rejection ratio.

• Low Noise: The input transistors have low noise characteristics.

• Unity Gain Bandwidth: With a unity gain bandwidth of 3MHz, the IC can operate without distorting output signals when set to unity gain.

• Operating Temperature: It performs optimally within a temperature range of 0°C to 70°C.

• The RC4558 can function as either a single-supply operational amplifier or a dual-supply operational amplifier, although for reliable performance, a single-supply configuration is recommended. It comes with various available packages, including TO-99, CDIP, DSBGA, SOIC, PDIP, and DSBGA.

Additional advantages of the RC4558 include:

• No need for frequency compensation.

• It is immune to latch-up.

• Amplifiers demonstrate gain and phase matching.

• Low noise characteristics, typically 8 nV/√Hz at 1 kHz.

Where to use RC4558?

• Primarily, it excels in channel separation, making it a suitable substitute for the LM741 IC in dense single 741 operational amplifier setups.

• Furthermore, it seamlessly integrates into differential input and output configurations, as well as potentiometric amplifier applications.

• Moreover, it offers the valuable attribute of matched phase and gain, rendering it ideal for tasks demanding synchronized gain and phase channels.

• Additionally, it finds utility in voltage follower applications, thanks to its broad common-mode input voltage range and the absence of offset null capability.

In conjunction with the functions listed above, it capably fulfills the fundamental operational amplifier roles, while capitalizing on the attributes mentioned.

How to use RC4558?

The functionality of this integrated circuit (IC) becomes apparent when considering a voltage-controlled oscillator circuit illustrated below. To create this voltage-controlled oscillator, typically requiring two operational amplifiers (op-amps), you have the option to utilize the RC4558 IC as a replacement. The input voltage to be controlled is introduced at pin 2. This input signal undergoes division via a network consisting of a voltage divider connected between pins 2 and 3, with half of the voltage being directed to pin 3.

RC4558 Functional Block Diagram

Voltage Controlled Oscillator Example Circuit

Op-amp A initiates the generation of a triangular waveform upon powering up the IC. A current path is established through the 100k resistor, subsequently discharging the 0.05µF capacitor, resulting in the formation of a triangular waveform at its output. This output is then linked to the input pin of op-amp B via a 51kΩ resistor. Op-amp B functions as a Schmitt trigger, diligently monitoring the input voltage. When the input voltage surpasses the predetermined threshold level, it triggers a HIGH signal at the output. Conversely, if the input voltage dips below this threshold, the output reverts to zero. Consequently, this process yields a square wave as the final output.

RC4558 Replacement

Equivalent single Op-Amp IC

LM741 is equivalent to RC4558.

Alternatives Dual Op-Amp IC

LM358, MCP602, LM2904M, NE5532, OPA2228, OPA2134, and OPA2604 can replace the RC4558.

RC4558 Applications

• DVD recorders and players

• Professional audio mixers

• Transducer amplifiers

• Traditional operational amplifier setups

• Functions like integrators, differentiators, summers, and voltage followers

• Deployment in DC gain blocks, digital multimeters, and oscilloscopes

• Utilization as comparators for loop control and regulation

• Generation of square wave oscillations

• Integration in audio mixer systems

• Driving of lamp circuits

• Voltage following tasks

• Additional use in square wave oscillators

• Further lamp driver applications

Absolute Maximum Ratings

Handling Ratings

Recommended Operating Conditions

Thermal Information

Electrical Characteristics

Operating Characteristics

RC4558 Package

RC4558 Manufacturer

Texas Instruments, often referred to as TI, is a prominent American technology firm headquartered in Dallas, Texas. The company specializes in the design and production of semiconductors and a diverse array of integrated circuits, which it supplies to electronic designers and manufacturers worldwide. With a solid position among the top 10 global semiconductor companies in terms of sales, TI's primary focus lies in the advancement of analog chips and embedded processors, contributing significantly to more than 80% of its overall revenue.

In addition to its semiconductor expertise, TI is well-known for its innovations in digital light processing technology and educational products. Among these educational offerings, you'll find calculators, microcontrollers, and multi-core processors. Remarkably, as of 2016, the company boasts a substantial global patent portfolio, comprising 45,000 patents.

RC4558 Datasheet

Download RC4558 Datasheet PDF.

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