AMC1202DWVR Reinforced Isolated Amplifier Selection Guide: AMC1202, AMC1302, AMC3302, AMC1311 Compared
How to choose the right TI AMCxxxx reinforced isolated amplifier for motor drives, BMS, and SiC inverters — covering input range, DC/DC integration, CMTI, and precision.
Last updated: June 2026
Bottom Line: When selecting a reinforced isolated amplifier for motor drives, solar inverters, or industrial current sensing, prioritize three parameters above all: isolation voltage rating (≥ 5 kV for IEC 61800-5-1 compliance), input voltage range matched to your shunt (±50 mV for low-ohm shunts, ±250 mV or 2 V for higher-value shunts), and integrated DC/DC supply (saves two external rails and simplifies layout). Texas Instruments' AMC1202, AMC1302, AMC3302, and AMC1311 families cover the full matrix; this guide tells you which to pick and when.
Why Reinforced Isolation Matters in Power Electronics
Reinforced isolation protects both the operator and the microcontroller from high-voltage transients on the power bus. IEC 61010-1 and IEC 60664-1 define reinforced isolation as double the clearance and creepage of basic isolation, offering a single-fault-safe barrier. In a 600 V motor drive, a fault without reinforced isolation can push 850 V peak across the signal ground, destroying the MCU and creating a safety hazard. The IEC 61800-5-1 standard for adjustable-speed drives mandates reinforced isolation on any signal path crossing the power/control boundary. All devices in the TI AMCxxxx series carry a 5 kV RMS or 7 kV peak reinforced isolation rating that satisfies this requirement.
Key Selection Parameter 1 — Input Voltage Range
The input voltage range must match the differential voltage that your current-sense shunt or voltage divider produces. A mismatch causes signal clipping, nonlinearity, or sensitivity loss.
- ±50 mV range (AMC1202DWVR, AMC1302DWV, AMC1302DWVR): Optimal for milliohm shunts (0.5–5 mΩ) carrying 10–100 A. Gain is fixed internally at ×41 (AMC1202) or ×41 (AMC1302), mapping ±50 mV → ±2.048 V output. This high gain minimizes ADC input noise.
- ±250 mV range (AMC3302DWE, AMC3302DWER): Suits shunts of 5–25 mΩ at moderate currents, or resistive dividers on DC bus rails up to 1250 V (5× gain). The AMC3302 also integrates a DC/DC converter, eliminating the isolated power supply.
- 0–2 V range (AMC1311DWV, AMC1311DWVR, AMC1311BDWV): Designed for voltage sensing directly on resistive dividers, gate-driver DESAT pins, or NTC thermistors. Gain = 1 V/V with high 1 MΩ input impedance.
Choose your shunt resistance first, then pick the amplifier whose full-scale input range makes 80–90% use of that shunt's differential voltage at maximum current.
Key Selection Parameter 2 — Integrated DC/DC Converter
An isolated amplifier needs power on both the high-voltage (field) side and the low-voltage (controller) side. Without an internal DC/DC, you must supply a separate isolated 3.3 V or 5 V rail on the field side — adding cost, board area, and EMI.
- With integrated DC/DC (AMC3302DWE, AMC3302DWER): The AMC3302 powers its own field side from the controller 5 V supply, outputting an internal ~500 mW isolated rail. This simplifies BOM to a single SOIC-16 package with no external transformer.
- Without integrated DC/DC (AMC1202DWVR, AMC1302DWV, AMC1311DWV): Requires an external isolated supply (e.g., a tiny flyback or a push-pull converter). This adds 5–10 components but enables better noise isolation and flexibility in field-side supply voltage.
In space-constrained designs or when driving ≤ 4 isolated channels, prefer parts with integrated DC/DC. In high-channel-count systems, a shared external isolated supply is more efficient.
Key Selection Parameter 3 — Bandwidth and Settling Time
Bandwidth determines the fastest current transient you can accurately measure. Motor-drive current loops typically require 50–100 kHz closed-loop bandwidth, demanding an isolated amplifier with at least 5× higher signal bandwidth.
- AMC1202DWVR: 200 kHz signal bandwidth, suitable for most industrial motor drives.
- AMC1302DWV / AMC1302DWVR: 200 kHz, identical to AMC1202 but with tighter offset (±25 µV vs. ±100 µV) for precision current measurement.
- AMC3302DWE / AMC3302DWER: 200 kHz; same bandwidth as AMC1302 but in the integrated-DC/DC package.
- AMC1311DWV / AMC1311BDWV: 200 kHz to 275 kHz (B-grade); the BDWV variant with 275 kHz is suited for high-speed gate-driver feedback loops.
For servo drives with 20 kHz PWM, 200 kHz is generally sufficient. If you use oversampling or sigma-delta ADCs above 500 kHz, check that the amplifier's group-delay response does not introduce phase shift.
Key Selection Parameter 4 — Offset Voltage and Gain Accuracy
Offset voltage and gain error directly translate into current measurement error. In battery management systems (BMS) or energy meters, a 1% gain error on a 100 A shunt means 1 A of permanent offset in state-of-charge (SoC) calculation.
| Device | Offset Voltage (max) | Gain Error (max) | Best For |
|---|---|---|---|
| AMC1202DWVR | ±0.5 mV | ±0.6% | General motor drive |
| AMC1302DWV | ±25 µV | ±0.1% | Precision current sensing |
| AMC1302DWVR | ±25 µV | ±0.1% | Tape-and-reel version of AMC1302DWV |
| AMC3302DWE | ±50 µV | ±0.2% | Integrated DC/DC, precision |
| AMC1311BDWV | ±2 mV | ±0.4% | High-CMTI voltage sensing |
For IEC 61557-12 Class 0.5 energy metering, choose the AMC1302 family (±0.1% gain error). For standard inverter current loops, the AMC1202 family's ±0.6% is adequate.
Key Selection Parameter 5 — Common-Mode Transient Immunity (CMTI)
CMTI specifies how many kV/µs of common-mode voltage change the amplifier can reject without corrupting output. In SiC or GaN gate-driver applications, switching edges can exceed 100 kV/µs.
- AMC1202DWVR, AMC1302DWV: CMTI ≥ 100 kV/µs — meets most Si-IGBT drive requirements.
- AMC1311DWV, AMC1311BDWV: CMTI ≥ 150 kV/µs — designed specifically for high-CMTI voltage sensing on SiC or GaN platforms.
If you are designing with SiC MOSFETs switching at 200 kV/µs or faster, select AMC1311B variants (e.g., AMC1311BDWV or AMC1311BDWVR).
Key Selection Parameter 6 — Operating Temperature Range
Industrial applications run from −40 °C to +125 °C. Automotive designs (AEC-Q100 Grade 1) require qualification over the same range with additional stress testing.
- Standard (−55 °C to +125 °C): AMC1302DWV, AMC1311DWV, AMC1311BDWV.
- Standard (−40 °C to +125 °C): AMC1202DWVR, AMC3302DWE.
- Automotive AEC-Q100: AMC3302-Q1, AMC3302QDWERQ1, AMC1311BQDWVQ1, AMC1311BQDWVRQ1, AMC1311QDWVQ1 — choose these for EV inverter designs that must pass PPAP.
Key Selection Parameter 7 — Package and Board Area
All devices come in small-outline packages with extended creepage slots between the input and output pins, providing the required 8 mm creepage for 5 kV reinforced isolation.
- 8-SOIC (SOP-8 wide): AMC1202DWVR, AMC1302DWV, AMC1302DWVR, AMC1311DWV, AMC1311DWVR, AMC1311BDWV, AMC1311BDWVR — compact, minimum BOM when using an external isolated supply.
- 16-SOIC (SOP-16 wide): AMC3302DWE, AMC3302DWER — slightly larger footprint but the integrated DC/DC eliminates all external power components.
Recommended Products Comparison Table
| Product | Input Range | Integrated DC/DC | Offset (max) | Gain Error (max) | CMTI | Best For |
|---|---|---|---|---|---|---|
| AMC1202DWVR | ±50 mV | No | ±0.5 mV | ±0.6% | 100 kV/µs | Motor drive current sensing, general industrial |
| AMC1302DWV | ±50 mV | No | ±25 µV | ±0.1% | 100 kV/µs | Precision BMS / energy metering |
| AMC3302DWE | ±250 mV | Yes | ±50 µV | ±0.2% | 100 kV/µs | Space-constrained drives, no external power |
| AMC1311DWV | 0–2 V | No | ±2 mV | ±0.4% | 150 kV/µs | Voltage sensing, SiC/GaN gate feedback |
| AMC1311BDWV | 0–2 V | No | ±2 mV | ±0.4% | 150 kV/µs | High-CMTI precision voltage sensing |
Selection Decision Flowchart
Step 1 — Sensing current or voltage?
- Current sensing → proceed to Step 2.
- Voltage sensing → choose AMC1311DWV or AMC1311BDWV; skip to Step 5.
Step 2 — What is the shunt differential voltage at full-scale current?
- ≤ 50 mV → proceed to Step 3.
- 50–250 mV → go to AMC3302DWE (Step 4) or AMC3302DWER.
Step 3 — Do you need precision (gain error ≤ 0.2%) or is ≤ 0.6% acceptable?
- Precision required → AMC1302DWV or AMC1302DWVR.
- Standard accuracy acceptable → AMC1202DWVR.
Step 4 — Does your layout allow an external isolated supply?
- Yes → AMC1302DWV (for lower shunt voltage, ±50 mV).
- No → AMC3302DWE (integrated DC/DC, ±250 mV).
Step 5 — Is the design automotive (AEC-Q100 required)?
- Yes → choose the -Q1 suffix variant (e.g., AMC3302-Q1, AMC1311BQDWVQ1).
- No → standard commercial/industrial grade.
FAQ
Q1: What is the difference between AMC1202DWVR and AMC1302DWV?
The AMC1202DWVR and AMC1302DWV share the same ±50 mV input range, 200 kHz bandwidth, and 5 kV reinforced isolation, but differ in precision. The AMC1302DWV offers a maximum offset of ±25 µV and ±0.1% gain error — roughly 4–6× better than the AMC1202DWVR's ±0.5 mV and ±0.6%. Choose AMC1302DWV for battery management, energy meters, or any application requiring Class 0.5 current accuracy. Choose AMC1202DWVR for cost-sensitive motor drives where ±0.6% gain error is acceptable.
Q2: Do I need an isolated power supply when using AMC1202DWVR?
Yes. The AMC1202DWVR requires an isolated 3.3 V or 5 V supply on the field side (pins VDD1). You can use a small flyback converter, a push-pull transformer driven by a PWM controller, or a dedicated isolated DC/DC module such as the Murata MGJ2 series. If you want to eliminate this external supply, use the AMC3302DWE, which includes an integrated DC/DC converter powered from the controller-side 5 V rail.
Q3: Which AMC amplifier is best for SiC MOSFET gate-driver current sensing?
The AMC1311BDWV is the recommended choice for SiC MOSFET applications. Its ≥ 150 kV/µs CMTI rating handles the fast switching edges typical of SiC devices (often 100–200 kV/µs). The 2 V input range works directly with resistive dividers on the gate-driver supply rail or DESAT protection networks. The 275 kHz signal bandwidth of the BDWV variant provides adequate headroom for current-loop control.
Q4: Is the AMC3302 AEC-Q100 qualified for automotive use?
Yes, but you must specify the correct part number. The standard AMC3302DWE is not AEC-Q100 qualified. For automotive applications, use the AMC3302-Q1 or AMC3302QDWERQ1, which are qualified to AEC-Q100 Grade 1 (−40 °C to +125 °C, HBM Class 2). Both are available through FindMyChip's network of 200+ verified distributors; request a quote to compare pricing across suppliers.
Q5: How do I verify I am buying authentic TI AMC isolated amplifiers?
Counterfeit analog ICs are a known risk in spot-market procurement. To reduce this risk: (1) purchase from TI-authorized distributors only; (2) inspect laser-marking font, lead finish, and date code formatting against TI's factory standards; (3) use electrical characterization (measure gain, offset, and CMTI against the datasheet limits) on incoming parts. FindMyChip's 5-point authentication program covers exactly these steps. Search for AMC1202DWVR or search for AMC3302DWE to compare verified-distributor offers.
Conclusion
Texas Instruments' AMCxxxx reinforced isolated amplifier family covers every current and voltage sensing need in IEC- and AEC-Q100-regulated power electronics designs. For general industrial motor drives, the AMC1202DWVR offers the best cost-to-performance ratio. For precision BMS or energy metering, step up to the AMC1302DWV. When board space or BOM count is constrained, the AMC3302DWE eliminates the external isolated supply entirely. For SiC or GaN high-CMTI voltage sensing, choose the AMC1311BDWV.
FindMyChip connects you to 200+ verified distributors, provides 5-point anti-counterfeit authentication, and delivers competitive China-based pricing with 24-hour quote response. Search for AMC series amplifiers or request a quote to compare live inventory and pricing across the full family.