BROADCOM HCPL-7800A Optocoupler Isolation Amplifier, SMD DIP 8-Pin, 3.75kV, 100

The BROADCOM HCPL-7800A-500E is a high-performance isolation amplifier engineered for precision current sensing in demanding electronic environments, particularly within motor drive systems. It employs advanced sigma-delta (Σ-Δ) analogue-to-digital converter technology alongside chopper-stabilised amplifiers to deliver exceptional accuracy and stability. The device creates a fully isolated differential output voltage that is directly proportional to the motor current flowing through an external sense resistor, effectively bridging the high-voltage motor circuit and the low-voltage control system with robust optical isolation.

Key to its design is a fully differential circuit topology, which provides superior noise immunity and high common-mode rejection. The amplifier is capable of rejecting common-mode transients at a rate of 15kV/µs, ensuring reliable operation in electrically noisy industrial settings. It achieves high linearity with a typical non-linearity of just 0.004%, while input offset voltage is minimised to a typical 0.3mV. The output bandwidth supports signals up to 100kHz, making it suitable for monitoring dynamic current waveforms.

Housed in a compact, auto-insertable 8-pin surface-mount DIP (Dual In-line Package), this optocoupler is designed for efficient PCB assembly. It is built to operate reliably across a wide ambient temperature range from -40°C to +85°C, catering to industrial and automotive applications. The device holds major international safety approvals, including UL 1577 certification for 3750Vrms isolation for one minute and compliance with IEC/EN/DIN EN 60747-5-5, guaranteeing its suitability for safety-critical designs.

Typical Applications

• Motor phase and rail current sensing in variable frequency drives (VFDs) and servo drives.
• Inverter current sensing for renewable energy systems and power conversion.
• Signal isolation in switched-mode power