Part A
ACPL-C79B-000E
Broadcom Limited
- Lifecycle
- Active
- Stock
- 5529 PCS
- Package
- SSO-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The ACPL-C87A-500E and ACPL-C79B-000E are both isolated analog-to-digital converter optocouplers from Broadcom's ACPL series, sharing a common functional architecture as isolated sigma-delta modulator front-ends. While they exhibit strong alignment in isolation voltage, supply voltage range, and operating temperature range, the ACPL-C87A-500E offers a higher input voltage range and different package option that may require validation for specific application requirements. The ACPL-C79B-000E remains a viable functional alternative where its lower input range and standard SO-8 package are acceptable.
Isolation Voltage
High match
Supply Voltage Range
High match
Input Voltage Range
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
ACPL-C87A-500E
Broadcom Limited
- Lifecycle
- Active
- Stock
- 7176 PCS
- Package
- SSO-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ACPL-C87A-500E | ACPL-C79B-000E | Why it matters |
|---|---|---|---|
| Manufacturer | Broadcom | Broadcom | Confirms both parts come from the same supplier, simplifying sourcing and qualification. |
| Function | Isolation amplifier for voltage sensing | Isolation amplifier for current sensing | Determines whether the device is intended to measure voltage or current, which dictates circuit topology and shunt placement. |
| Input Signal Type | Voltage input (via resistive divider) | Current input (via shunt resistor) | The input conditioning network differs, so the two parts are not directly interchangeable without redesign. |
| Input Voltage Range | ±2 V (nominal, with external divider) | ±200 mV (across shunt) | Defines the maximum signal the amplifier can accept before clipping, affecting measurement range and accuracy. |
| Isolation Voltage (UL 1577) | 5000 Vrms for 1 minute | 5000 Vrms for 1 minute | Ensures safety and compliance in high-voltage applications; identical rating means both meet the same isolation requirement. |
| Output Type | Differential analog voltage | Differential analog voltage | Both provide a differential output, allowing direct interface to differential ADCs, but signal scaling differs. |
| Gain | 1 (unity, with external divider) | 8.2 (fixed) | Gain determines the output voltage for a given input; different gains mean different signal conditioning and calibration. |
| Bandwidth | 100 kHz | 200 kHz | Affects the maximum frequency of signals that can be accurately measured, impacting control loop speed. |
| Package | Stretched SO-8 (500 mil) | Stretched SO-8 (500 mil) | Identical package allows the same PCB footprint, but pin functions may differ, so layout must be verified. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Both support industrial temperature ranges, ensuring reliable operation in harsh environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ACPL-C79B-000E | ACPL-C87A-500E |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Isolation | Isolation |
| Number of Circuits | 1 | 1 |
| Output Type | Differential | Differential |
| -3 dB Bandwidth | 200 kHz | 100 kHz |
| Current - Input Bias | 100 nA | 1.5 nA |
| Voltage - Input Offset | 600 µV | 300 µV |
| Supply Current | 13mA | 10.5mA |
| Current - Output / Channel | 11 mA | 30 mA |
| Voltage - Supply Span(Min) | 4.5 V | 3 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the ACPL-C87A-500E and ACPL-C79B-000E?
The ACPL-C87A-500E is a precision optically isolated voltage sensor from Broadcom's ACPL-C87A series, designed for isolated voltage sensing in applications such as motor drives and power inverters. The ACPL-C79B-000E is an optically isolated amplifier from Broadcom's ACPL-C79B series, designed for isolated current sensing in motor control and power conversion systems. Both are optocoupler-based isolation components but serve different sensing functions.
What is the key functional difference between the ACPL-C87A-500E and ACPL-C79B-000E?
The ACPL-C87A-500E is an isolated voltage sensor that measures voltage directly across its input, while the ACPL-C79B-000E is an isolated amplifier intended for current sensing when used with an external shunt resistor. The ACPL-C87A integrates a voltage divider input, whereas the ACPL-C79B accepts a differential input signal from a shunt for current measurement.
Do the ACPL-C87A-500E and ACPL-C79B-000E have the same package and pinout?
Both devices are offered in surface-mount SO-8 (small outline, 8-pin) packages with similar footprint dimensions. However, pin functions differ between the two devices because one is a voltage sensor and the other is an isolated amplifier. Designers must consult the respective Broadcom datasheets to verify pin assignments before considering any layout reuse.
What are the isolation voltage ratings for these components?
Both the ACPL-C87A-500E and ACPL-C79B-000E are rated for reinforced insulation with an isolation voltage of 5000 Vrms for 1 minute per UL 1577, and both offer working voltage ratings suitable for industrial isolation requirements. Designers should confirm the specific isolation parameters, including transient immunity and creepage/clearance, from the official Broadcom datasheets for each part number.
Can the ACPL-C87A-500E and ACPL-C79B-000E be used interchangeably in a design?
No. The ACPL-C87A-500E is a voltage sensor with an internal input voltage divider and is intended to measure voltage directly, while the ACPL-C79B-000E is an isolated amplifier designed to amplify a small differential signal from a current shunt. Their input structures, transfer functions, and intended measurement functions differ, so they are not direct substitutes. Any substitution requires full validation against the target application requirements and manufacturer datasheets.
What are the typical applications for the ACPL-C87A-500E and ACPL-C79B-000E?
The ACPL-C87A-500E is typically used for isolated DC bus voltage sensing in motor drives, inverters, and renewable energy systems. The ACPL-C79B-000E is typically used for isolated current sensing in motor phase current measurement, servo drives, and power supply feedback loops. Both are common in industrial and automotive high-voltage isolation applications.
What is the significance of the suffix differences, such as -500E versus -000E?
The suffixes indicate ordering and packaging options defined by Broadcom. The -500E suffix on the ACPL-C87A-500E typically denotes tape-and-reel packaging for automated assembly. The -000E suffix on the ACPL-C79B-000E typically denotes the standard tube or bulk packaging option. These suffixes do not change the electrical or functional specifications of the devices; they only affect how the parts are shipped and handled in production.
What supply voltage and output type do these devices use?
Both the ACPL-C87A-500E and ACPL-C79B-000E operate from a single 5 V supply on the output side and provide a differential analog output. The ACPL-C87A-500E output is proportional to the input voltage, while the ACPL-C79B-000E output is proportional to the differential input signal from a shunt. Exact gain, offset, and nonlinearity specifications should be verified from the respective Broadcom datasheets.