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 is a viable functional replacement candidate for the ACPL-C784-500E in isolated current sensing applications, sharing the same package footprint, isolation architecture, and sigma-delta modulation topology. However, designers must validate the reduced input voltage range and lower gain tolerance against the target application requirements before committing to a drop-in substitution.
Package Type
High match
Isolation Voltage
High match
Input Voltage Range
Validation required
Gain Tolerance
Validation required
Parts at a glance
Part B
ACPL-C784-500E
Broadcom Ltd
- Lifecycle
- Active
- Stock
- 6380 PCS
- Package
- SSO-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-C784-500E | ACPL-C790-500E | Why it matters |
|---|---|---|---|
| Input Signal Type | Analog (isolated amplifier) | Analog (isolation amplifier) | Both are analog isolation amplifiers, but the C784 is optimized for current sensing with a specific input range, while the C790 is a general-purpose isolation amplifier; this affects circuit topology and signal conditioning requirements. |
| Input Voltage Range | ±200 mV (nominal, with external shunt) | ±200 mV (nominal, with external shunt) | The input range determines the compatible shunt resistor value and the measurable current range; both are designed for small differential signals across a shunt. |
| Gain | 8.2 V/V (typical) | 8.2 V/V (typical) | Fixed gain defines the output voltage for a given input differential; matching gain ensures the same signal scaling in the downstream ADC or controller. |
| Isolation Voltage (UL 1577) | 5000 Vrms for 1 minute | 5000 Vrms for 1 minute | Isolation voltage is critical for safety and noise immunity in high-voltage applications; identical ratings mean both meet the same basic isolation requirements. |
| Bandwidth | 100 kHz (typical, -3 dB) | 100 kHz (typical, -3 dB) | Bandwidth limits the maximum signal frequency that can be accurately amplified; both are suitable for low-to-medium frequency current sensing and motor control. |
| Supply Voltage (VDD1 / VDD2) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Supply voltage compatibility determines whether the part can be used in 5 V or 3.3 V systems; both require a 5 V nominal supply on both sides. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Industrial temperature range ensures reliable operation in harsh environments; identical ranges mean both are suitable for the same application conditions. |
| Package / Mounting | 8-pin SOIC (surface mount, stretched body) | 8-pin SOIC (surface mount, stretched body) | Package and footprint must match for drop-in replacement; both use the same stretched SOIC-8 package, allowing PCB layout compatibility. |
| Output Type | Differential analog voltage | Differential analog voltage | Differential output improves noise immunity and allows direct connection to differential ADCs; both provide this output style. |
| Nonlinearity | ±0.05% (typical) | ±0.05% (typical) | Low nonlinearity ensures accurate signal reproduction; identical specifications mean both offer the same measurement fidelity for precision applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ACPL-C790-500E | ACPL-C784-500E |
|---|---|---|
| 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 | - |
| 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 |
Frequently asked questions
What are the ACPL-C784-500E and ACPL-C790-500E?
The ACPL-C784-500E and ACPL-C790-500E are optically isolated sigma-delta (Σ-Δ) modulators from Broadcom (formerly Avago Technologies). Both are designed for high-resolution current and voltage sensing in motor drive, power inverter, and industrial applications, providing galvanic isolation between the high-voltage power stage and the low-voltage control electronics.
What is the key difference between the ACPL-C784-500E and ACPL-C790-500E?
The primary difference is the input voltage range and corresponding gain. The ACPL-C784-500E 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 affects the full-scale input range and the resulting signal-to-noise performance for a given shunt voltage.
Are the ACPL-C784-500E and ACPL-C790-500E pin-compatible?
Yes. Both devices are offered in the same 8-pin surface-mount package (SO-8) with identical pinout assignments. This allows a common PCB footprint, but electrical differences such as input range and gain must be validated before substituting one for the other in an existing design.
What is the isolation voltage rating for these modulators?
Both the ACPL-C784-500E and ACPL-C790-500E are rated for 5 kV RMS isolation for 1 minute per UL 1577, and they carry IEC/EN/DIN EN 60747-5-5 approval with a working voltage of 891 V peak. These ratings make them suitable for reinforced isolation in high-voltage industrial systems.
What is the typical signal-to-noise ratio (SNR) of these devices?
Both the ACPL-C784-500E and ACPL-C790-500E typically achieve an SNR of 78 dB (typical) with a 10 MHz internal clock. The actual SNR depends on the input signal amplitude and the external filter configuration used with the modulator output bitstream.
Can the ACPL-C784-500E and ACPL-C790-500E operate from the same supply voltages?
Yes. Both devices operate from a 5 V nominal supply on the input side (VDD1) and a 3.3 V or 5 V nominal supply on the output side (VDD2). The recommended operating supply voltage range is 4.5 V to 5.5 V for VDD1 and 3.0 V to 5.5 V for VDD2, allowing flexible interfacing with common microcontrollers and DSPs.
What is the operating temperature range for these modulators?
Both the ACPL-C784-500E and ACPL-C790-500E are specified for an operating temperature range of –40 °C to +105 °C, making them suitable for industrial and automotive-adjacent environments where wide temperature operation is required.
Which device should be selected for a given shunt-based current sensing design?
Selection depends on the expected shunt voltage magnitude. The ACPL-C784-500E with its ±200 mV input range is better suited for lower shunt voltages, while the ACPL-C790-500E with its ±320 mV input range accommodates larger shunt voltages without clipping. The choice should be validated against the target full-scale current, shunt resistor value, and desired resolution.