Part A
ACPL-C87B-000E
ブロードコム株式会社
- Lifecycle
- Active
- Stock
- 7760 個数
- Package
- SSO-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Compatible functional replacement candidate
The ACPL-C79B-000E and ACPL-C87B-000E are functionally compatible isolated amplifier candidates sharing the same package, isolation architecture, and signal chain topology, but they differ in input voltage range and output interface configuration. The ACPL-C87B-000E is not a direct drop-in replacement for the ACPL-C79B-000E without validating the input sensing network and output interface against the target application requirements.
Package Type
High match
Isolation Voltage
High match
Input Voltage Range
Validation required
Output Interface
Validation required
Parts at a glance
Part B
ACPL-C79B-000E
ブロードコム株式会社
- Lifecycle
- Active
- Stock
- 5529 個数
- Package
- SSO-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
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-C79B-000E | ACPL-C87B-000E | Why it matters |
|---|---|---|---|
| Input Signal Type | Isolated analog voltage (shunt-based current sensing) | Isolated analog voltage (DC voltage sensing) | Determines the sensing topology; the C79B is optimized for current sensing across a shunt, while the C87B is optimized for direct voltage sensing. |
| Nominal Input Voltage Range | ±200 mV | ±2 V | Defines the full-scale signal the device can accurately digitize; a 10x difference means the two parts are not directly interchangeable without signal scaling. |
| Input Resistance | ~22 kΩ (typical) | ~1 MΩ (typical) | Affects loading on the sensed node; the C87B's high impedance suits voltage dividers, while the C79B's low impedance suits shunt-based current sensing. |
| Isolation Working Voltage (VIORM) | 891 Vpeak | 1414 Vpeak | Higher isolation voltage allows use in higher-voltage systems; the C87B supports higher working voltages than the C79B. |
| Gain | 8.2 (typical) | 1.0 (typical) | Gain determines the output scaling relative to input; different gains require different downstream signal conditioning. |
| Output Type | Differential analog output | Differential analog output | Both provide differential outputs for noise immunity, but the output swing and common-mode characteristics differ due to different gain and input ranges. |
| Bandwidth | 200 kHz (typical) | 100 kHz (typical) | Bandwidth limits the maximum signal frequency that can be accurately measured; the C79B supports faster signals than the C87B. |
| Supply Voltage (VDD1/VDD2) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate from the same supply range, simplifying power supply design when substituting between them. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Identical temperature ratings mean both parts are suitable for the same industrial environments. |
| Package | Stretched SO-8 (SSO-8) | Stretched SO-8 (SSO-8) | Same package footprint allows drop-in PCB compatibility, though electrical differences still require circuit redesign. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ACPL-C87B-000E | ACPL-C79B-000E |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Isolation | Isolation |
| Number of Circuits | 1 | 1 |
| Output Type | Differential | Differential |
| -3 dB Bandwidth | 100 kHz | 200 kHz |
| Current - Input Bias | 1.5 nA | 100 nA |
| Voltage - Input Offset | 300 µV | 600 µV |
| Supply Current | 10.5mA | 13mA |
| Current - Output / Channel | 30 mA | 11 mA |
| Voltage - Supply Span(Min) | 3 V | 4.5 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-C79B-000E and ACPL-C87B-000E?
The ACPL-C79B-000E and ACPL-C87B-000E are isolated amplifier optocouplers from Broadcom (formerly Avago Technologies). Both are designed for current sensing and voltage sensing in motor control, power inverter, and industrial applications, providing galvanic isolation between high-voltage and low-voltage circuits.
What is the primary difference between the ACPL-C79B-000E and ACPL-C87B-000E?
The ACPL-C79B-000E is an isolated current sensing amplifier with a ±200 mV input range optimized for shunt resistor current measurement. The ACPL-C87B-000E is an isolated voltage sensing amplifier with a ±2 V input range designed for direct voltage measurement. Their input voltage ranges and intended sensing functions differ accordingly.
What is the input voltage range of each device?
The ACPL-C79B-000E has a nominal input voltage range of ±200 mV, suitable for shunt-based current sensing. The ACPL-C87B-000E has a nominal input voltage range of ±2 V, suitable for voltage sensing applications.
What isolation voltage do these devices provide?
Both the ACPL-C79B-000E and ACPL-C87B-000E provide reinforced galvanic isolation with a working insulation voltage of 1,140 Vpeak and a transient overvoltage rating of 8,000 Vpeak, as specified in the Broadcom datasheets.
Are the ACPL-C79B-000E and ACPL-C87B-000E pin-compatible?
Yes, both devices are offered in the same 8-pin surface-mount package (SO-8) with identical pinout assignments for power supply, ground, input, and output pins. However, because their input signal ranges and internal signal conditioning differ, they are not electrically interchangeable without circuit redesign.
What is the typical gain and output configuration of these amplifiers?
Both devices provide a differential output with a fixed gain. The ACPL-C79B-000E has a gain of 8.2 V/V referenced to its ±200 mV input range. The ACPL-C87B-000E has a gain of 0.82 V/V referenced to its ±2 V input range. Both output a differential signal centered around a common-mode voltage of approximately 2.5 V.
What are the typical applications for each device?
The ACPL-C79B-000E is typically used for isolated current sensing in motor phase current measurement, DC bus current monitoring, and switching power supply current feedback. The ACPL-C87B-000E is typically used for isolated DC bus voltage sensing, inverter output voltage monitoring, and high-voltage measurement in industrial systems.
What is the operating temperature range for both devices?
Both the ACPL-C79B-000E and ACPL-C87B-000E are specified for an operating temperature range of –40 °C to +105 °C, as stated in the Broadcom datasheets.
Can the ACPL-C79B-000E and ACPL-C87B-000E be used in the same circuit for combined current and voltage sensing?
Yes, because they share the same package and isolation ratings, both devices can be used in the same system to provide isolated current sensing (ACPL-C79B-000E) and isolated voltage sensing (ACPL-C87B-000E) on the same PCB, provided the respective input signal conditioning circuits are designed for their different input ranges.