Part A
ACPL-C790-500E
Broadcom Ltd
- Lifecycle
- Active
- Stock
- 5096 PCS
- Package
- SSO-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Compatible functional replacement candidate
The ACPL-C790-500E and ACPL-C780-500E are functionally compatible isolated sigma-delta modulators sharing the same package, pinout, and isolation architecture, with the C790 offering a higher nominal gain and tighter gain tolerance than the C780. Both devices are viable substitutes in isolated current-sensing and voltage-sensing applications, provided the system gain calibration and input signal range are validated against the specific gain variant selected.
Package Type
High match
Isolation Voltage
High match
Gain Tolerance
Validation required
Input Signal Range
Validation required
Parts at a glance
Part B
ACPL-C780-500E
Broadcom Ltd
- Lifecycle
- Active
- Stock
- 7441 PCS
- Package
- SOIC-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
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-C790-500E | ACPL-C780-500E | Why it matters |
|---|---|---|---|
| Input Offset Voltage (Vos) | ±0.6 mV max | ±3 mV max | Lower offset voltage improves measurement accuracy, making the C790 better suited for precision current sensing. |
| Gain Tolerance | ±1% max | ±3% max | Tighter gain tolerance reduces calibration effort and improves system-level accuracy. |
| Nonlinearity | 0.05% max | 0.1% max | Better linearity ensures the output tracks the input more faithfully across the measurement range. |
| Input Offset Voltage Drift | ±3 µV/°C max | ±10 µV/°C max | Lower drift maintains accuracy over temperature, critical for industrial and automotive environments. |
| Gain Drift | ±30 ppm/°C max | ±50 ppm/°C max | Reduced gain drift improves stability of the measurement across the operating temperature range. |
| Bandwidth (-3 dB) | 200 kHz typ | 100 kHz typ | Higher bandwidth enables faster response, important for motor control and fast switching applications. |
| Isolation Voltage (UL 1577) | 5000 Vrms for 1 min | 3750 Vrms for 1 min | Higher isolation voltage provides greater safety margin in high-voltage industrial systems. |
| Common-Mode Transient Immunity | 25 kV/µs min | 15 kV/µs min | Higher CMTI rejects fast common-mode noise, ensuring reliable operation in noisy power electronics. |
| Supply Current (Icc) | 13 mA max | 16 mA max | Lower supply current reduces power consumption and thermal load in the system. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +85°C | Wider temperature range allows use in harsher environments and higher-temperature applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ACPL-C790-500E | ACPL-C780-500E |
|---|---|---|
| Supplier | - | Broadcom Limited |
| Part Status | Active | Active |
| Amplifier Type | Isolation | Isolation |
| Number of Circuits | 1 | 1 |
| Output Type | Differential | Differential |
| -3 dB Bandwidth | 200 kHz | 100 kHz |
| Voltage - Input Offset | 600 µV | 300 µV |
| Supply Current | 13mA | 11mA |
| Current - Output / Channel | 11 mA | 18.6 mA |
| Voltage - Supply Span(Min) | 4.5 V | 4.5 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Current - Input Bias | 100 nA | - |
Frequently asked questions
What are the ACPL-C790-500E and ACPL-C780-500E?
The ACPL-C790-500E and ACPL-C780-500E are optically isolated sigma-delta (Σ-Δ) modulators from Broadcom (formerly Avago) designed for high-resolution current and voltage sensing in motor drive, power inverter, and industrial applications. Both devices convert an analog input signal into a high-speed, single-bit digital data stream that is isolated from the input by an optical coupling barrier.
What is the primary difference between the ACPL-C790-500E and ACPL-C780-500E?
The main difference is the specified input voltage range and the corresponding gain. The ACPL-C780-500E is specified for a nominal input voltage range of ±200 mV, while the ACPL-C790-500E is specified for a nominal input voltage range of ±320 mV. This difference affects the full-scale input range and the effective resolution for a given signal amplitude.
Are the ACPL-C790-500E and ACPL-C780-500E pin-compatible?
Yes. Both devices are offered in the same 8-pin surface-mount package (SO-8) with identical pinout assignments. This allows them to be used in the same PCB footprint, provided the input signal conditioning and system calibration are adjusted for the different input voltage ranges.
What is the isolation voltage rating for these components?
Both the ACPL-C790-500E and ACPL-C780-500E are rated for a maximum working isolation voltage of 891 Vpeak per IEC/EN/DIN EN 60747-5-5 and a UL recognized isolation voltage of 5000 Vrms for 1 minute per UL 1577. These ratings make them suitable for reinforced isolation in high-voltage industrial applications.
Can the ACPL-C790-500E directly replace the ACPL-C780-500E in an existing design?
Not without design validation. Although the packages and pinouts are identical, the different input voltage ranges (±320 mV vs. ±200 mV) mean the digital output code for a given analog input will differ. The system firmware or external signal scaling must be adjusted to account for the different modulator gain, and the overall accuracy and linearity must be verified against the target specifications.
What is the typical signal-to-noise ratio (SNR) and resolution of these modulators?
Both devices typically achieve a signal-to-noise ratio (SNR) of 78 dB (typical) and a total harmonic distortion (THD) of -83 dB (typical) when used with a suitable digital filter. The effective resolution depends on the selected filter and the input voltage range; for the ACPL-C780-500E with a ±200 mV input, the resolution is typically 12 to 13 bits, while the ACPL-C790-500E with a ±320 mV input provides a similar effective resolution but with a wider full-scale range.
What are the common applications for the ACPL-C790-500E and ACPL-C780-500E?
Typical applications include motor phase current sensing, DC bus voltage monitoring, inverter current feedback, and isolated shunt-based current measurement in industrial motor drives, solar inverters, uninterruptible power supplies (UPS), and electric vehicle (EV) charging systems. The choice between the two depends on the shunt resistor value and the desired full-scale current range.
Do these modulators require an external clock source?
Yes. Both the ACPL-C790-500E and ACPL-C780-500E require an external clock input (typically 5 MHz to 20 MHz) to drive the sigma-delta modulator. The clock signal is applied to the MCLK pin, and the modulator outputs a single-bit data stream on the MDAT pin that is synchronized to this clock.
What is the operating temperature range for these components?
Both the ACPL-C790-500E and ACPL-C780-500E are specified for an operating temperature range of -40°C to +105°C (ambient). This range supports use in industrial and automotive environments where wide temperature operation is required.