CA3130E (BiMOS Operational Amplifier - 8-Pin DIP Package)

When standard operational amplifiers like the LM358 or TL072 cannot handle the delicate, microscopic currents of your sensors, the CA3130 is the specialty silicon you reach for. This chip is a legendary "BiMOS" operational amplifier, meaning it masterfully combines Bipolar, PMOS, and CMOS technologies onto a single piece of silicon. The result is an amplifier that features gate-protected PMOS transistors at the input, providing a staggeringly high input impedance (typically 1.5 Tera-ohms). This means the chip draws virtually zero current (mere picoamps) from whatever circuit you connect it to, making it entirely "invisible" to highly sensitive analog sources.

Beyond its incredible inputs, the CA3130 stands out because of its CMOS output stage. Unlike traditional op-amps that suffer from "voltage drop" and cannot output a voltage all the way up to your power supply line, the CA3130 can swing its output voltage "rail-to-rail"—meaning if you power it with 5V, it can output very close to a true 0V and a true 5V. This makes it an absolutely phenomenal choice when you need an analog amplifier to directly interface with digital 5V TTL or CMOS logic circuits, or when building precision integrators and timers that rely on exact voltage thresholds.

Key Features & Functional Advantages:

• Extreme Input Impedance: Boasts an input impedance of 1.5 TΩ (Tera-ohms) and an input bias current of just 5 pA, meaning it will not load down or distort weak signals from piezoelectric sensors or photodiodes.

• Rail-to-Rail CMOS Output: The output voltage can swing to within millivolts of the supply and ground rails, making it perfect for driving digital logic gates directly without level shifters.

• BiMOS Architecture: Utilizes PMOS inputs for high impedance, a Bipolar core for speed and voltage gain, and a CMOS output for maximum voltage swing and current sinking/sourcing capability.

• High Speed & Bandwidth: Features a highly respectable 15 MHz unity-gain bandwidth and a fast 10 V/µs slew rate, making it significantly faster than standard general-purpose op-amps.

• Single Supply Friendly: Operates flawlessly on a single 5V to 16V power supply (or dual ±2.5V to ±8V supplies), making it highly compatible with modern microcontroller battery packs and USB power.

Perfect For:

• High-Impedance Sensor Interfaces: The absolute best choice for amplifying signals from pH probes, gas sensors, and photodiodes where the sensor itself produces almost no current.

• Precision Timers & Integrators: Pairs perfectly with high-value capacitors to create long-duration delay circuits and ultra-linear ramp generators.

• Analog-to-Digital Interfacing: Ideal for acting as a voltage comparator that safely and cleanly translates analog sensor thresholds into hard 5V logic signals for an Arduino or ESP32.

• Audio & Synthesizer DIY: Highly favored in the DIY synth community for building sample-and-hold (S&H) circuits due to its extremely low input leakage current, which prevents voltage "droop."

Technical Specifications:

• Amplifier Type: BiMOS (Bipolar + PMOS + CMOS)

• Number of Channels: 1 (Single Op-Amp)

• Input Impedance: 1.5 TΩ (Typical)

• Input Bias Current: 5 pA (Typical at 5V)

• Slew Rate: 10 V/µs

• Gain Bandwidth Product: 15 MHz

• Operating Supply Voltage: 5V to 16V (Single Supply) or ±2.5V to ±8V (Dual Supply)

• Output Current: ~20 mA (Sink/Source capability depends on supply voltage)

• Package / Case: 8-DIP (0.300", 7.62mm width)

• Mounting Type: Through-Hole (PTH)

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