AMC0202D - ±50mV Isolated Amplifier 3kVRMS | TI
MPN: AMC0202D ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.15 | $2.15 |
| 10 | $1.93 | $19.30 |
| 100 | $1.65 | $165.00 |
| 500 | $1.4 | $700.00 |
| 1,000 | $1.18 | $1,180.00 |
AMC0202D Overview
An isolated amplifier is an amplifier that provides galvanic isolation between its input and output stages, enabling safe measurement of the voltage across a shunt resistor in high-voltage systems. Within the signal-chain hierarchy, it sits between the current-sense shunt and the ADC or microcontroller, converting a small floating differential voltage into a ground-referenced signal. Isolation amplifiers are a core building block of industrial power-electronics control and protection systems.
Key features include the narrow ±50mV linear input range optimized for low-value shunts, fixed gain of 8.2 V/V, and a differential output that is insensitive to ground potential shifts and can be routed over long distances. DC accuracy is high, with typical offset of ±0.2mV and gain error of ±0.2%. Common-mode transient immunity reaches 100 kV/us, which keeps the device stable in the presence of fast switching edges from IGBT and GaN power stages.
Technically, the AMC0202D transfers the signal across a capacitive isolation barrier: the high-side stage amplifies the shunt voltage, the isolated barrier carries the information, and the low-side stage delivers a differential output for direct connection to a differential ADC or op-amp. The high-side and low-side each operate from a 3.3V or 5V supply, drawing roughly 5mA per side.
Typical applications include motor phase current sensing in variable-speed drives, inverter current monitoring in solar and UPS systems, and battery current measurement in energy storage systems, plus industrial process control and test equipment.
Design tip: place the shunt resistor close to the input pins, keep the input loop inductance minimal, and filter high-frequency noise without compromising signal bandwidth. Family members in the DWV wide-body package (AMC0380D/AMC0302D) offer reinforced 5 kVRMS isolation when required.
Drop-in alternatives for AMC0202D — 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:
AMC0202D-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
AMC0202D Maximum Ratings & Electrical Characteristics
| Input Voltage Range (Linear) | ±50 mV |
| Gain | 8.2 V/V (fixed) |
| Output Type | Differential |
| Input Offset Voltage | ±0.2 mV (typ) |
| Gain Error | ±0.2% (typ) |
| Common-Mode Transient Immunity | 100 kV/us (min) |
| Isolation Rating | 3 kVRMS (basic, 60 s) |
| Supply Voltage (Each Side) | 3.3 V or 5 V |
| Supply Current (Per Side) | approx. 5 mA |
| Operating Temperature | -40C to +125C |
| Package | 8-SOIC (D), narrow body |
| Mounting Type | Surface Mount |
| Isolation Type | Capacitive (TI ISO cap technology) |
| Automotive Qualification | No (AMC0202D-Q1 for AEC-Q100) |
| RoHS Status | Compliant |
AMC0202D Pin Configuration
| Pin 1 | VDD1 — High-side supply, 3.3V or 5V |
| Pin 2 | INP — Non-inverting input (shunt +) |
| Pin 3 | INN — Inverting input (shunt -) |
| Pin 4 | GND1 — High-side ground |
| Pin 5 | GND2 — Low-side ground |
| Pin 6 | OUTN — Inverting differential output |
| Pin 7 | OUTP — Non-inverting differential output |
| Pin 8 | VDD2 — Low-side supply, 3.3V or 5V |
Typical Applications
AMC0202D is suitable for 6 applications: Motor Drive Phase Current Sensing, Solar Inverter Current Monitoring, Battery Energy Storage Current Measurement, UPS and AC Power Systems, Traction Inverter and Automotive Power, Industrial Test and Process Control.
Motor Drive Phase Current Sensing
In variable-frequency drives and servo drives, the AMC0202D measures phase current via a low-value shunt in series with each motor phase. Its ±50mV linear input range matches sub-milliohm shunts, minimizing conduction loss at tens of amperes, while the fixed 8.2 V/V gain scales the signal for 3.3V ADC inputs. The 100 kV/us CMTI keeps the amplifier stable against dv/dt transients from IGBT or SiC switching, and basic 3 kVRMS isolation separates the hazardous phase domain from the controller. Place the shunt within millimeters of INP/INN to keep the Kelvin-sense loop inductance low and prevent gain peaking at high frequency.
Recommended
Solar Inverter Current Monitoring
Grid-tied solar inverters require isolated DC-link and AC output current feedback. The AMC0202D's differential output is insensitive to ground potential shifts, allowing the output signal to route across the inverter PCB to the DSP without additional isolation. With ±0.2mV typical offset and ±0.2% gain error, the device supports MPPT current accuracy and hardware overcurrent protection thresholds. Powered from 3.3V or 5V on each side at roughly 5mA per side, it integrates easily into existing power trees. The basic 3 kVRMS rating suits systems where reinforced isolation is provided elsewhere in the barrier chain.
Recommended
Battery Energy Storage Current Measurement
In battery packs and ESS racks, the AMC0202D measures pack current across a shunt while isolating the floating high-voltage battery domain from ground-referenced BMS electronics. The ±50mV input range keeps shunt power dissipation low even at hundreds of amperes, improving round-trip efficiency. Its -40C to +125C operating range covers outdoor container installations, and the differential output tolerates the long routing distances between shunt and BMS controller found in rack-level architectures. Typical offset of ±0.2mV supports coulomb-counting accuracy when combined with a precision ADC.
Recommended
UPS and AC Power Systems
Uninterruptible power supplies use the AMC0202D for inverter output current feedback and rectifier input current monitoring. The capacitive isolation barrier with 100 kV/us CMTI withstands the steep edges of high-frequency PWM stages without data corruption. The differential analog output connects directly to the DSP's ADC or through an op-amp difference stage for single-ended systems, enabling fast cycle-by-cycle current limiting. Because the device draws only about 5mA per side from a 3.3V or 5V rail, it adds negligible burden to auxiliary power supplies in compact UPS form factors.
Recommended
Traction Inverter and Automotive Power
For electric-vehicle traction inverters and onboard chargers, use the AEC-Q100 qualified AMC0202D-Q1 variant, which shares the ±50mV input, 8.2 V/V gain, and differential output of the AMC0202D. Phase-current sensing with the shunt-plus-isolated-amplifier approach provides the fast, accurate feedback needed for field-oriented control at switching frequencies of 10-20kHz. The 100 kV/us CMTI rating handles GaN and SiC edge rates, and the differential output resists the severe ground bounce present in traction inverters. Select the DWV wide-body family members when reinforced isolation is mandatory in the signal path.
Recommended
Industrial Test and Process Control
Test equipment, PLC analog modules, and process-control systems use the AMC0202D to make ground-loop-free current measurements on equipment operating at elevated potentials. The isolation breaks ground loops that would otherwise corrupt low-level measurements, while ±0.2% typical gain error and ±0.2mV offset provide the repeatability demanded by instrumentation. The simple analog interface (two supply pins in, differential pair out) means no firmware, clocks, or digital configuration is required, shortening design time compared to isolated modulator approaches. The narrow-body SOIC-8 keeps channel pitch small in multi-channel data acquisition cards.
Recommended
Recommended Products Summary
Engineering reference data for AMC0202D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AMC0202D-Q1 | AMC1306M25 | ACPL-C799 |
|---|---|---|---|---|
| Package | 8-SOIC (D), narrow body | 8-SOIC (D) - same | 8-SOIC (DWV) wide body | 8-SOIC (wide body) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Broadcom |
| Output Type | Analog differential | Analog differential | Delta-sigma bitstream | Delta-sigma bitstream |
| External Filter Requirement | Simple RC optional | Simple RC optional | Sinc filter in MCU required | Sinc filter in MCU required |
Key Differentiators
- Pure analog differential output - no digital filter needed (vs AMC1306M25)
- Automotive drop-in upgrade path (vs AMC0202D-Q1)
- Narrow-body SOIC-8 footprint saves board area (vs AMC0380D)
Design Notes
Place the shunt resistor directly adjacent to pins 2 and 3 (INP/INN) and route Kelvin sense traces as a tight differential pair. Minimize loop inductance - excessive input loop inductance combined with the input capacitance can cause ringing or gain peaking at switching frequencies. Keep the high-side ground (GND1) return path short and connected directly to the shunt's local ground reference.
Decouple VDD1 and VDD2 each with a 0.1uF ceramic capacitor placed within 2mm of the supply pins, plus a 1uF bulk capacitor per side. The device draws roughly 5mA per side from 3.3V or 5V. Both supplies should be well-regulated; supply ripple on the high side modulates the input stage offset and can degrade the ±0.2mV typical offset specification.
The differential output (OUTP/OUTN, pins 6 and 7) rejects common-mode noise and may be routed long distances, but still benefits from a matched pair with ground guard traces. Add a first-order RC filter (e.g., 100 ohm / 1nF, ~1.6MHz cutoff) ahead of the ADC to suppress out-of-band quantization noise without significantly limiting signal bandwidth. For single-ended ADCs, use a precision difference amplifier such as the OPA2375.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified - use AMC0202D-Q1 for automotive. REACH and halogen-free status not stated in provided data.
