Product Overview: STMicroelectronics MC1458IDT

The STMicroelectronics MC1458IDT is a general-purpose dual operational amplifier (op-amp) housed in an 8-pin SOIC package. It is designed for applications where dual op-amps are required in a single device and where performance such as bandwidth, input offset voltage, and stability are essential. The MC1458 series is recognized for its robust performance in analog signal processing, including filtering, signal conditioning, and general-purpose amplification.

Key Features

* Dual internally frequency-compensated op-amps
* Short-circuit protection
* Low power consumption
* Compatible with standard bipolar op-amps like LM1458
* Wide operating temperature range suitable for industrial applications
* High input impedance and low output impedance
* Unity gain stable
* Suitable for single or dual-supply operation

Electrical Specifications

* Number of Channels: 2 (dual op-amps)
* Input Offset Voltage (typ): 2 mV
* Input Bias Current (typ): 80 nA
* Input Offset Current (typ): 20 nA
* Supply Voltage Range: ±3 V to ±18 V (or 6 V to 36 V total for single supply)
* Input Voltage Range: ±13 V (with ±15 V supply)
* Output Voltage Swing: ±13 V (typ) with ±15 V supply
* Common Mode Rejection Ratio (CMRR): 70 dB (typ)
* Power Supply Rejection Ratio (PSRR): 77 dB (typ)
* Large Signal Voltage Gain (Avo): 20 V/mV (typ)
* Unity-Gain Bandwidth: 1 MHz (typ)
* Slew Rate: 0.5 V/µs (typ)
* Quiescent Current (per amplifier): 0.8 mA (typ)
* Output Short-Circuit Duration: Continuous (with limitations)

Package and Mechanical Information

* Package Type: SOIC-8 (Small Outline Integrated Circuit, 8 leads)
* Package Width: 3.9 mm
* Mounting Type: Surface Mount
* Temperature Range: –40°C to +105°C (Industrial grade)
* RoHS Compliance: Yes
* Moisture Sensitivity Level (MSL): Level 1 (Unlimited shelf life at ≤30°C/85% RH)

Functional Description

The MC1458IDT integrates two independent op-amps in one package, with each amplifier internally frequency compensated. This simplifies usage in a wide variety of linear applications, such as:

* DC gain blocks
* Active filters
* Summing amplifiers
* Voltage followers/buffers
* Integrators and differentiators
* Comparator circuits (with limitations due to lack of rail-to-rail performance)

Its input and output characteristics allow for good linearity and drive capability in standard signal conditioning circuits. The device operates over a wide supply range, making it suitable for both single-supply and split-supply designs.

Performance Considerations

While the MC1458IDT is a robust and versatile device, it is not optimized for ultra-low noise or high-speed applications. Its slew rate and bandwidth make it ideal for low- to medium-frequency signal applications. The device offers protection against output short circuits and is known for good thermal stability over the rated industrial temperature range.

Applications

* Industrial instrumentation
* Analog signal processing in embedded systems
* Sensor signal conditioning
* Audio preamplifiers
* Control systems
* Data acquisition systems

Conclusion

The STMicroelectronics MC1458IDT is a highly reliable, dual op-amp solution ideal for cost-sensitive applications requiring standard analog signal amplification. Its combination of internal compensation, wide voltage range, and dual-channel configuration makes it a valuable component in both legacy and new analog circuit designs.