Solution Introduction：

Broadcom offers a rich variety of optoisolator ICs, including ordinary analog optoisolators for low-speed analog signals, fault detection, power control, and other applications; digital optoisolators for various digital circuits; high-speed low-power optoisolators for IGBT gate driving; and high-linearity isolation amplifiers for current detection. These products feature advantages such as high isolation performance, high-speed transmission, low power consumption, and high reliability, enjoying wide applications and recognition in the electronics industry.

1. Introduction to Optoisolators

An optoisolator, also known as an optical isolator, is a commonly used semiconductor device. Its role in a circuit is to block and convert photoelectric signals, isolating unwanted signals by physically separating the high-voltage circuit system from the adjacent low-voltage system.

An optoisolator transmits signals through light as the medium. It typically encapsulates a light emitter, an isolation medium, and a light receiver in the same package, forming three links: light emission, transmission, and photosensitive detection. When an electrical signal is applied to the input end, the light emitter emits light, and the light receiver generates a photocurrent after receiving the light, which flows out from the output end, thus achieving "electrical-optical-electrical" control.

According to signal conversion characteristics, optoisolator devices can be divided into linear optoisolators and non-linear optoisolators. According to application scenarios, they are categorized into three major types: digital optoisolators, gate drivers, and isolation amplifiers. Digital optoisolators purely achieve signal isolation; gate drivers enhance current driving capability based on signal isolation, enabling the driving of gates for power devices such as IGBTs and MOSFETs; isolation amplifiers are used in feedback paths to return detected voltage, current, and other signals to the MCU for processing.

2. Broadcom Optoisolator Series

2.1 High-Speed CMOS Digital Optoisolators

ACSL-7210: A dual-channel bidirectional 25MBd digital optoisolator optimized for bidirectional industrial communication networks using high-speed protocols like PROFIBUS fieldbus and Serial Peripheral Interface (SPI). The device achieves a high isolation voltage of 3750VRMS in a thin, narrow-body SOIC-8 package (<2mm). It enables a propagation delay of 40ns and a maximum pulse width distortion of 10ns to meet the digital isolation design requirements of high-speed industrial communication networks, with a common-mode noise immunity of 35 kV/μs at 1000 VCM.
ACPL-M71U and ACPL-M72U: High-temperature digital CMOS optoisolators suitable for high-temperature industrial digital isolation applications, featuring excellent performance and low power consumption. ACPL-M71U uses a high-speed LED with a maximum propagation delay of 35ns (IF=10mA), while ACPL-M72U uses a low-current LED to reduce power consumption, with a typical propagation delay of 55ns at a low 4mA LED drive current. They operate in the temperature range of -40°C to 125°C and adopt SO-5 packaging.
ACPL-077L: A high-speed CMOS optoisolator with an operating voltage of 3.3V/5V and a working temperature of -40°C to +105°C. It achieves a data rate of 25MBd and a maximum pulse width distortion of 6ns, using a common SO-8 package with an isolation voltage of 3750 Vrms for 1 minute, providing a common-mode transient immunity of 35 kV/μs at VCM 1000V.
ACPL-071L: Utilizes a high-speed LED and a CMOS detector IC, with an operating voltage of 3.3V/5V and a single-channel 15MBd rate, in an SOIC-8 package. The corresponding dual-channel 15MBd series is ACPL-074L.
ACPL-W70L: Incorporates an integrated photodiode, a high-speed transimpedance amplifier, and a voltage comparator with an output driver, featuring single-channel 15MBd, an operating voltage of 3.3V/5V, and a working temperature of -40°C to +105°C. It uses a stretched SO-6 package, with the corresponding dual-channel model being ACPL-K73L.
ACPL-K73L: A CMOS optoisolator with dual-channel 15MBd, in a stretched SO8 package, achieving excellent performance with extremely low power consumption.
ACPL-M75L: A CMOS optoisolator with single-channel 15 MBd, in an SOIC-5 package.
ACPL-772L: A CMOS optoisolator with an operating voltage of 3.3V/5V, featuring a minimum data rate of 25MBd and a maximum pulse width distortion of 6ns, in a common DIP-8 package. ACPL-072L uses an SO-8 package.

2.2 10MBd Digital Optoisolators

ACNT-H61L and ACNT-H61LC: Low-power digital optoisolators with an operating voltage of 3.3V/5V, a working temperature of -40°C to +105°C, and a CMR of 20 kV/μs. They adopt a stretched SO-8 package with a creepage width of 15mm and a clearance of 14.2mm, making them ideal for isolated communication logic interfaces and control in high-voltage power systems, such as 1500V photovoltaic systems, 690Vac drivers, renewable inverters, and medical devices.
ACPL-C61L: A digital CMOS optoisolator combining an AlGaAs light-emitting diode with an integrated high-gain photodetector to meet low-power requirements. It has an operating voltage of 3.3V/5V, a working temperature of -40°C to +105°C, and a maximum IDD of 1.5mA across the entire temperature range. With a forward current as low as 3mA, it allows DC driving by most microprocessors. It uses a stretched SO-8 package with an internal clearance of 0.5mm, an isolation voltage of 5000 Vrms for 1 minute, and provides a common-mode transient immunity of 20 kV/μs.
ACPL-M62L: A digital CMOS optoisolator combining an AlGaAs light-emitting diode with an integrated high-gain photodetector to meet low-power requirements. It has an operating voltage of 3.3V/5V, a working temperature of -40°C to +105°C, and a maximum IDD of 1.5mA across the entire temperature range. The forward current is as low as 2mA, providing a common-mode transient immunity of 20 kV/μs. While maintaining TTL/CMOS compatibility, it achieves maximum AC and DC circuit isolation, suitable for high-speed logic interface applications.
ACPL-M71U and ACPL-M72U: High-temperature digital CMOS optoisolators, where ACPL-M71U uses a high-speed LED with a maximum propagation delay of 35ns (IF=10mA), and ACPL-M72U features low power consumption with a typical propagation delay of 55ns at a low 4mA LED drive current. Operating in the temperature range of -40°C to 125°C with SO-5 packaging, they are suitable for high-temperature industrial digital isolation applications.
ACNW261L: A single-channel ultra-low-power optoisolator with an operating voltage of 3.3V/5V, a working temperature range of -40°C to +105°C, and a maximum IDD current of 1.5mA per channel across the temperature range. With an LED forward current as low as 4mA, most microprocessors can directly drive the LED. It uses a wide-body 400mil DIP-8 package with an isolation voltage of 5000 Vrms for 1 minute, providing a common-mode transient immunity of 20 kV/μs, while maintaining TTL/CMOS compatibility and achieving maximum AC and DC circuit isolation.
ACPL-061L: A low-power optoisolator with an operating voltage of 3.3V/5V, a working temperature range of -40°C to +105°C, and a maximum IDD of 1.5mA across the entire temperature range. The LED forward current is as low as 1.6mA, allowing DC driving by most microprocessors. It uses an SO-8 package with an isolation voltage of 3750 Vrms for 1 minute, and the output of the detector IC is a CMOS output, providing a common-mode transient immunity of 20 kV/μs, suitable for low-power high-speed logic interfaces.
ACPL-064L: A dual-channel optoisolator with an operating voltage of 3.3V/5V, a working temperature range of -40°C to +105°C, and a maximum IDD current of 1.3mA per channel across the temperature range. The forward LED current is as low as 1.6mA, and most microprocessors can directly drive the LED. It uses an SO-8 package, providing a common-mode transient immunity of 20 kV/μs, suitable for high-speed logic interface applications.
ACNV2601: A single-channel 10MBd optical coupler with a working temperature range of -40°C to +105°C, providing a common-mode transient immunity of 20 kV/μs at Vcm=1500V. It uses a stretched SO-10 package with creepage and clearance greater than 13mm, designed to provide a high isolation voltage (7500 Vrms), capable of withstanding a continuous high operating voltage of 2262 V peak and a surge voltage of 12000 V peak.
ACNV260E: A single-channel 10MBd optical coupler with a working temperature range of -40°C to +105°C. It uses a stretched SO-10 package, providing an isolation voltage of 5000 Vrms, an insulation distance (DTI) of 2mm, and creepage and clearance of 13mm. It provides a common-mode transient immunity of 20 kV/μs at Vcm=1500V, suitable for high-speed logic interfaces, input/output buffering, and use in harsh noise interference environments.

2.3 1MBd Digital Optoisolators

ACNT-H511C: A single-channel high CTI optoisolator with an operating voltage range of 4.5V~24V and a working temperature range of -40°C to +105°C. It uses a 15mm stretched SO8 package with an isolation voltage of 7500 Vrms for 1 minute and a high insulation voltage of Viorm=2262Vpeak, suitable for isolated communication logic interfaces and control in high-voltage power systems, such as 1500V photovoltaic systems, 690VAC drivers, railway systems, and renewable inverters/energy storage in medical devices.
ACNU-250L: A single-channel 1MBd optoisolator device with an operating voltage range of 3V~24V and a working temperature range of -40°C to +105°C. It uses an 11mm stretched SO8 package with 11mm creepage and 10.5mm clearance, an isolation voltage of 5000 Vrms for 1 minute, and a high insulation voltage of Viorm=1414Vpeak, suitable for isolated communication logic interfaces and control in high-voltage power systems, space-constrained industrial applications, renewable inverters, and medical devices.
ACNT-H511: A single-channel open-collector optoisolator device with an operating voltage range of 4.5V~24V and a working temperature range of -40°C to +105°C. It uses a 15mm stretched SO8 package, ideal for isolated communication logic interfaces and control in high-voltage power systems, such as 1500V photovoltaic systems, 690VAC drivers, renewable inverters, and medical devices.
ACNT-H50L: A single-channel 1MBd optoisolator device with an operating voltage range of 3V~24V and a working temperature range of -40°C to +105°C, using a 15mm stretched SO8 package, ideal for isolated communication logic interfaces and control in high-voltage power systems, such as 1500V photovoltaic systems, 690VAC drivers, renewable inverters, and medical devices.
ACPL-K49U: A single-channel, high-temperature, high CMR, 20kBD digital optoisolator with a working temperature range of -40°C to +125°C, configurable as a low-power, low-leakage phototransistor. It uses a stretched SO-8 package, mainly applied in high-temperature industrial applications.
ACPL-M49U: A single-channel, high-temperature, high CMR, 20kBd digital optoisolator with a working temperature range of -40°C to +125°C, configurable as a low-power, low-leakage phototransistor, with a minimum common-mode transient immunity of 15kV/μs at VCM=1500V. It uses an SO-5 package, mainly applied in high-temperature industrial applications.
ACPL-W50L: A single-channel optoisolator is a low-power, low-input current digital optoisolator with an operating voltage of 2.7V~24V, a working temperature range of -40°C to +105°C, an isolation voltage of 5000 Vrms for 1 minute, a working insulation voltage VIORM of 1140 VPEAK, and a minimum common-mode transient immunity of 15kV/μs at VCM=1500V. At IF=3mA, the current transfer ratio (CTR) is typically 130%. It uses a stretched SO-6 package and can be used in any TTL/CMOS, TTL/LSTTL, or broadband analog applications.
ACPL-M51L: A low-power, low-power-voltage single-channel 1Mbd digital optoisolator with an operating voltage range of 2.25V~24V, a working temperature range of -40°C to +105°C, and a minimum common-mode transient immunity of 15000 V/μs at VCM=1500 V. At IF=3mA, the current transfer ratio (CTR) is typically 140%, using an SO-5 package, applicable to any TTL/CMOS, TTL/LSTTL, or other analog applications.
ACPL-K54L: An optoisolator is a low-power, low-input current, open-collector output dual-channel digital optoisolator with an operating voltage of 2.7V~24V, a working temperature range of -40°C to +105°C, an isolation voltage of 5000 Vrms for 1 minute, a working insulation voltage VIORM of 1140 VPEAK, and a minimum common-mode transient immunity of 15kV/μs at VCM=1500V. At IF=3mA, the current transfer ratio (CTR) is typically 130%. It uses a stretched SO-8 package and can be used in any TTL/CMOS, TTL/LSTTL, or broadband analog applications.
ACPL-054L: A dual-channel optoisolator is a low-power, low-input current, open-collector output digital optoisolator with an operating voltage of 2.7V~24V, a working temperature range of -40°C to +105°C, and a minimum common-mode transient immunity of 15kV/μs at VCM=1500V. At IF=3mA, the current transfer ratio (CTR) is typically 130%. It uses an SO-8 package and can be used in any TTL/CMOS, TTL/LSTTL, or broadband analog applications.

2.4 100KBd Digital Optoisolators

ACPL-K70A-000E: A low-power high-gain single-channel optoisolator with an operating voltage of 3.3V/5V and a working temperature range of -40°C to +105°C. Each channel can be driven with an input current as low as 40µA, with a typical current transfer ratio of 3500%. The device is designed for CMOS, LSTTL, and other low-power applications.
ACPL-K73A-000E: A low-power high-gain single-channel optoisolator with an operating voltage of 3.3V/5V and a working temperature range of -40°C to +105°C. Each channel can be driven with an input current as low as 40µA, with a typical current transfer ratio of 3500%. The device is designed for CMOS, LSTTL, and other low-power applications.
HCPL-270L: A high-gain series optoisolator with an operating voltage of 3.3V/5V and a working temperature range of 0°C to +70°C. It requires only 0.5mA of LED current to ensure a minimum current transfer ratio of 400%. It uses an SOIC-8 package, suitable for LVTTL/LVCMOS or other low-power applications.
HCPL-0730: A dual-channel optoisolator with an operating voltage VCC as low as 1.6V and a working temperature range of 0°C to +70°C. With an input current of 1.6mA, it has a 7V VCC and VO rating, and lower input currents as low as 250mA can be selected upon request, using a standard SO-8 package.
HCPL-073L: A high-gain series optoisolator with an operating voltage of 3.3V/5V and a working temperature range of 0°C to +70°C. It requires only 0.5mA of LED current to ensure a minimum current transfer ratio of 400%, using a standard SO-8 package, suitable for LVTTL/LVCMOS or other low-power applications.
6N139: A high-gain optoisolator series with a working temperature range of 0°C to +70°C, requiring only 0.5mA of LED current to ensure a minimum current transfer ratio of 400%. It uses DIP-8 or SO-8 packaging, suitable for CMOS, LSTTL, or other low-power applications.
HCNW138: A high-gain optoisolator series with a working temperature range of 0°C to +70°C, a minimum current transfer ratio (CTR) of 300%, and uses DIP-8 or SO-8 packaging, mainly applied in TTL applications.
HCPL-070L: A high-gain series optoisolator with a working temperature range of 0°C to +70°C, requiring only 0.5mA of LED current to ensure a minimum current transfer ratio of 400%. It uses a standard SOIC-8 package, mainly for LVTTL/LVCMOS or other low-power applications.
HCPL-273L: A high-gain series optoisolator with an operating voltage of 3.3V/5V and a working temperature range of 0°C to +70°C, requiring only 0.5mA of LED current to ensure a minimum current transfer ratio of 400%. It uses a standard SOIC-8 package, mainly for LVTTL/LVCMOS or other low-power applications.
HCPL-0700: A high-gain optoisolator series using a standard SOIC-8 package with a working temperature range of 0°C to +70°C. For an LED current of 1.6mA (1 TTL unit load), the minimum current transfer ratio (CTR) is 300%. HCPL-0700 is mainly designed for TTL applications.

3. Optoisolator Device Selection

When selecting an optoisolator, the following parameters are generally considered:

Linearity or Non-linearity: For switching signal applications, non-linear optoisolators can be selected; for analog signal transmission, linear optoisolators are required.
Speed: Depending on application requirements, choose low-speed optoisolators (phototransistors, response speed in microseconds) or high-speed optoisolators (photodiodes, response speed in nanoseconds).
Isolation Voltage: As optoisolators serve as isolation components, their isolation performance is reflected by the isolation voltage, which refers to the maximum voltage that the input and output of the optoisolator can withstand without breakdown in a short time.
Current Transfer Ratio (CTR): This parameter refers to the percentage of output current to input current. A larger CTR value indicates that the optoisolator is more power-efficient but more susceptible to interference, and vice versa.
Operating Temperature: All optoisolators have a temperature range. When selecting, choose the operating temperature parameter according to the application scenario (commercial/industrial/automotive specifications) and requirements.
Packaging: Determine whether to select single-channel or multi-channel products based on the circuit and PCB structure space. Common optoisolator packages include DIP-4, DIP-8, SOP-4, SOP-8, etc.