Texas Instruments AMC1200SDUBR

Overview

AMC1200SDUBR from Texas Instruments is a fully-differential precision isolation amplifier with SiO₂ capacitive isolation barrier, ±250-mV input range optimized for shunt-based current sensing, 8× fixed gain (±0.5% accuracy), 108 dB CMRR at DC, and 60 kHz minimum input bandwidth. It enables accurate high-side current measurement in motor-control inverters operating up to 1200 VPEAK working voltage.

For engineers reviewing the AMC1200SDUBR datasheet, AMC1200SDUBR pinout, AMC1200SDUBR application, or AMC1200SDUBR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application differences.

Technical Context

The AMC1200SDUBR employs a second-order delta-sigma modulator on the high-voltage side, digitizing the differential analog input into a 1-bit bitstream clocked at ~10 MHz, then transmitting it across a certified SiO₂ capacitive isolation barrier. On the low-voltage side, a third-order active low-pass filter reconstructs the analog signal and applies fixed 8× gain.

Its isolation barrier provides 4250 VPEAK (AMC1200B variant) galvanic isolation per UL1577 and VDE V 0884-10, with 10 kV/µs minimum common-mode transient immunity and ≥400 V comparative tracking index (CTI). Output common-mode voltage self-adjusts to either 3.3 V or 5 V low-side supply, enabling direct interface with downstream ADCs or controllers.

Key Specifications

Pinout & Package

AMC1200SDUBR uses an 8-pin SOP (DUB) package measuring 9.50 mm × 6.57 mm, with gull-wing leads and reinforced creepage/clearance (7 mm min.) for reinforced isolation compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolation amplifier applications.

Compared with AMC1200SDUBR, AMC1301SDWVR offers wider bandwidth and lower noise but demands more complex filtering and lacks the self-adjusting output common-mode; ISO124U provides lower-cost transformer isolation but sacrifices bandwidth, CMRR, and modern low-voltage compatibility.

Availability

AMC1200SDUBR is available at Aetrix Electronics and suitable for motor control, green energy inverters, and industrial frequency inverters requiring stable component supply, long-term lifecycle assurance, and certified reinforced isolation.

Supply support for AMC1200SDUBR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in isolation, power management, and precision signal chain products.

The AMC1200 product line delivers reinforced-capacitive isolation amplifiers engineered for high-reliability current sensing in high-voltage industrial drives, renewable energy systems, and power conversion equipment.

FAQ

What is the isolation rating of the AMC1200SDUBR and which standards does it meet?

The AMC1200SDUBR is the AMC1200B variant and carries a 4250 VPEAK isolation voltage rating per UL1577 and VDE V 0884-10. It supports a 1200 VPEAK working voltage and achieves ≥10 kV/µs common-mode transient immunity. Certification documentation includes VDE certificate number 40016131 and UL file number E181974, confirming compliance for reinforced insulation in industrial safety applications.

Can the AMC1200SDUBR operate with a 3.3-V low-side supply, and how does that affect performance?

Yes, the AMC1200SDUBR supports VDD2 from 2.7 V to 5.5 V. At 3.3 V, its output common-mode voltage settles to 1.29 V (typical), and nonlinearity remains within ±0.1% - fully specified per datasheet Table 6.5. Low-side supply current is reduced to 3.8–6 mA, lowering power dissipation to 11.4–21.6 mW, making it ideal for 3.3-V microcontroller interfaces without level-shifting.

What is the maximum differential input voltage the AMC1200SDUBR can handle before clipping?

The AMC1200SDUBR clips when the differential input exceeds ±320 mV, though its specified linear range is ±250 mV. Within ±250 mV, nonlinearity is guaranteed ≤±0.075% (AMC1200B), and CMRR remains ≥108 dB. Exceeding ±320 mV risks saturation and introduces distortion; the internal input protection diodes limit current to 10 mA beyond AGND1 – 0.5 V or VDD1 + 0.5 V.

How does the AMC1200SDUBR's output common-mode voltage behave across temperature and supply variations?

The AMC1200SDUBR's output common-mode voltage (VOUT_CM) tracks VDD2 proportionally: 1.29 V at 3.3 V, 2.55 V at 5 V. Over temperature (–40°C to 105°C), variation is ±15 mV at 3.3 V and ±20 mV at 5 V, per Figure 27. This tight regulation ensures consistent ADC reference alignment and eliminates need for external common-mode biasing circuits in precision measurement systems.

Is the AMC1200SDUBR pin-compatible with other devices in the AMC1200 family, such as the DWV package variant?

No - the AMC1200SDUBR (DUB, SOP-8) and AMC1200SDWVR (DWV, SOIC-8) share identical pin numbering and functions but differ in body size (9.50 × 6.57 mm vs. 5.85 × 7.50 mm) and creepage/clearance (7 mm vs. 8 mm). PCB footprints are not interchangeable; layout redesign is required when switching packages, though schematic connectivity remains identical.