AMC0380D - ±400V AC-Input Reinforced Isolated Amplifier | TI
MPN: AMC0380D ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.7 | $47.00 |
| 100 | $4.15 | $415.00 |
| 500 | $3.75 | $1,875.00 |
| 1,000 | $3.35 | $3,350.00 |
AMC0380D Overview
An isolated amplifier is a signal-conditioning IC that provides galvanic isolation between its input and output, protecting low-voltage circuitry from high-voltage transients and ground loops. In the analog front-end (AFE) hierarchy, it sits between raw high-voltage sensing points and system ADCs or MCUs, and is essential in motor drives, grid infrastructure, solar inverters, and power monitoring where safety isolation and accuracy are paramount.
Key features include a linear input range of +/-400V with 8.3M-ohm input impedance, an integrated high-voltage resistive divider that eliminates external resistor networks, and a second-order delta-sigma (Delta-Sigma) modulator architecture for high resolution and strong noise immunity. The fixed-gain differential output simplifies interfacing with downstream ADCs and microcontrollers, while reinforced isolation provides robust protection against high-voltage transients.
Technically, the input stage drives a second-order Delta-Sigma modulator whose bitstream crosses the isolation barrier, ensuring excellent linearity and low offset drift over temperature. The differential output preserves signal integrity across the barrier and rejects common-mode noise on the low side.
Typical applications include AC phase-voltage sensing in three-phase motor drives, grid-tied solar inverters, and power quality monitoring, where the wide +/-400V input range removes the need for additional scaling circuitry.
When designing with the AMC0380D, maintain isolation creepage and clearance on the PCB, keep the device near the sensing point, and add a low-pass filter on the differential output to suppress modulator noise.
Drop-in alternatives for AMC0380D — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AMC0380D-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
AMC0380D04DFXR
✅ Drop-In📋 Reference alternative (not in catalog)
AMC0380D04QDFXRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
AMC0380D Maximum Ratings & Electrical Characteristics
| Product Type | Reinforced isolated amplifier, AC voltage input |
| Linear Input Range | +/-400 V |
| Input Impedance | 8.3 M-ohm |
| Input Divider | Integrated high-voltage resistive divider |
| Output Type | Fixed-gain differential |
| Modulator Architecture | Second-order delta-sigma |
| High-Side Supply (VDD1) | 3.0 V to 5.5 V |
| Low-Side Supply (VDD2) | 3.0 V to 5.5 V |
| Number of Channels | 1 |
| Isolation Type | Reinforced (galvanic) |
| Operating Temperature | -40C to +125C |
| Package | 15-SSOP, 0.65 mm pitch |
| Mounting Type | Surface Mount |
| Automotive Grade Option | AMC0380D-Q1 (AEC-Q100) |
| Typical Application | AC phase voltage sensing, grid infrastructure, solar inverters |
AMC0380D Pin Configuration
| Pin 1 | HVINPUT — High-voltage AC input to integrated divider |
| Pin 5 | VDD1 — High-side supply, 3.0V to 5.5V |
| Pin 6 | GND1 — High-side ground |
| Pin 8 | VDD2 — Low-side supply, 3.0V to 5.5V |
| Pin 9 | GND2 — Low-side ground |
| Pin 12 | OUTP — Differential output positive |
| Pin 13 | OUTN — Differential output negative |
| Pin 15 | NC/GND2 — [DATA_NEEDED: exact pinout per datasheet] |
Typical Applications
AMC0380D is suitable for 6 applications: Three-Phase Motor Drive Voltage Sensing, Grid-Tied Solar Inverter Phase Monitoring, Power Quality Monitoring and Smart Meters, EV Onboard Charger and Traction Inverter Sensing, Industrial Grid Infrastructure and UPS, Battery Energy Storage System AC-Side Sensing.
Three-Phase Motor Drive Voltage Sensing
In three-phase industrial motor drives, the AMC0380D senses AC phase voltages directly through its integrated high-voltage divider with +/-400V linear range and 8.3M-ohm impedance, feeding the fixed-gain differential output to the MCU ADC for control loops and protection. Reinforced galvanic isolation protects low-voltage control electronics from 400V-class rails. Placement near the sensing point with 10uF decoupling on VDD1/VDD2 minimizes noise pickup; an RC low-pass filter on the output suppresses delta-sigma modulator noise before sampling.
Recommended
Grid-Tied Solar Inverter Phase Monitoring
Grid-tied solar inverters require accurate AC phase-voltage measurement for synchronization, anti-islanding, and grid-code compliance. The AMC0380D connects directly to the AC line via its 8.3M-ohm integrated divider, eliminating external high-voltage resistor strings and their associated drift and creepage layout effort. The reinforced isolation barrier separates the 230V/400VAC grid side from the digital control side, while the differential output rejects common-mode noise from switching power stages, delivering clean voltage waveforms to DSPs such as TMS320F28379D.
Recommended
Power Quality Monitoring and Smart Meters
Power-quality analyzers and smart-meter front ends use the AMC0380D to measure mains voltage waveforms with low drift over -40C to +125C. The second-order delta-sigma modulator architecture provides stable, high-resolution conversion of the AC input, while the fixed-gain differential output interfaces simply with precision ADCs or MCU peripherals. The integrated divider removes calibration complexity of discrete resistor networks, improving long-term accuracy for billing-grade and harmonic-analysis equipment across industrial temperature ranges.
Recommended
EV Onboard Charger and Traction Inverter Sensing
For automotive traction inverters and onboard chargers, the AMC0380D-Q1 variant provides AEC-Q100-qualified AC voltage sensing with the same +/-400V range and reinforced isolation as the industrial AMC0380D. It monitors DC-link-adjacent AC quantities and grid input in charging systems, isolating high-voltage domains from automotive low-voltage ECUs. The 15-SSOP reinforced-isolation package supports compact designs where creepage space is limited, and the differential output drives automotive MCUs such as AM263x for functional-safety monitoring paths.
Recommended
Industrial Grid Infrastructure and UPS
Uninterruptible power supplies and grid-interconnection equipment use the AMC0380D to monitor AC line and bypass voltages. The direct-connect high-voltage input with 8.3M-ohm impedance minimizes loading and power loss on the sensed line, and the second-order delta-sigma modulator ensures accurate waveform reproduction for transfer-switch decisions and frequency tracking. Reinforced isolation maintains safety separation between mains and control grounds, while the -40C to +125C rating suits outdoor cabinet installations with wide thermal swings.
Recommended
Battery Energy Storage System AC-Side Sensing
Battery energy storage systems (BESS) require grid-side AC voltage measurement for charge/discharge control and protective relaying. The AMC0380D provides direct +/-400V AC sensing without external dividers, reducing component count in dense power-conversion cabinets. Its reinforced isolation and wide temperature rating support the harsh electrical environment of utility-scale inverters, and the differential output delivers a stable signal to monitoring MCUs. An RC filter on the output sets bandwidth for fundamental-frequency measurement while attenuating switching-frequency ripple.
Recommended
Recommended Products Summary
Engineering reference data for AMC0380D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AMC0380D-Q1 | AMC0380D04DFXR | AMC0380D04QDFXRQ1 |
|---|---|---|---|---|
| Package | 15-SSOP | 15-SSOP - same | 15-SSOP - same | 15-SSOP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Linear Input Range | +/-400 V | +/-400 V | +/-400 V | +/-400 V |
| Input Impedance | 8.3 M-ohm | 8.3 M-ohm | 8.3 M-ohm | 8.3 M-ohm |
| AEC-Q100 Qualified | No | Yes | No | Yes |
| Supply Range (VDD1/VDD2) | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Output Type | Fixed-gain differential | Fixed-gain differential | Fixed-gain differential | Fixed-gain differential |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| External Divider Needed | No (integrated) | No (integrated) | No (integrated) | No (integrated) |
Key Differentiators
- Integrated high-voltage resistive divider (vs AMC1301M25)
- Reinforced isolation in compact 15-SSOP (vs AMC0380D04DFXR)
- Automotive qualified variant available (vs AMC0380D04QDFXRQ1)
Design Notes
Maintain reinforced-isolation creepage and clearance on the PCB between the high-voltage (side 1) and low-voltage (side 2) copper regions. Do not route low-side traces under the side-1 section of the package. Place the AMC0380D close to the high-voltage sensing point to minimize exposed high-voltage trace length, and slot the PCB under the isolation barrier if additional creepage margin is required.
Decouple VDD1 and VDD2 each with a 100nF ceramic capacitor placed within 2mm of the pins, plus a 10uF bulk capacitor per side. Because the two sides may share different domains, never connect GND1 to GND2 except through the intended isolation strategy. Observe the 3.0V to 5.5V supply range on both sides; mixed 3.3V/5V operation is supported since the isolation barrier passes the modulator bitstream, not the analog signal.
The fixed-gain differential output carries residual delta-sigma modulator noise. Add a first-order RC low-pass filter (for example 1k-ohm and 10nF, roughly 16kHz cutoff) between OUTP/OUTN and the ADC input, and use the ADC differential input mode to reject common-mode noise. Sample synchronously or oversample-and-average in the MCU to further reduce quantization noise in metering-grade measurements.
Compliance Information
RoHS/lead-free status typical for current TI production parts; the AMC0380D-Q1 variant is AEC-Q100 qualified. Verify exact compliance certificates on TI.com product pages.
