Texas Instruments AMC23C12DWV

Overview

AMC23C12 from Texas Instruments is a reinforced isolated window comparator IC designed for high-speed overcurrent and overvoltage fault detection across galvanically isolated domains. It features adjustable ±20mV to ±300mV trip thresholds, 280ns typical propagation delay, 55V/ns minimum CMTI, and operates with independent 3–27V high-side and 2.7–5.5V low-side supplies. It is used in motor drive protection circuits where fast, accurate, and noise-immune fault sensing is critical.

For engineers reviewing the AMC23C12 datasheet, AMC23C12 pinout, AMC23C12 application, or AMC23C12 equivalent, key selection considerations include its reinforced isolation rating (7000VPK per VDE 0884-17), latch/transparent output mode control, open-drain output with 4mA sink capability, and operation over –40°C to +125°C for industrial and automotive power systems.

Technical Context

The AMC23C12 implements dual comparators (Cmp0 and Cmp1) forming a zero-centered window comparator: Cmp0 triggers on positive excursions above +VREF, Cmp1 on negative excursions below –VREF. Threshold adjustment is achieved via a precision 100μA ±1% internal current source applied to an external resistor on the REF pin, enabling direct mapping of resistance to trip voltage.

Isolation is implemented using TI's capacitive SiO₂ barrier, certified for reinforced insulation (5000VRMS/1min UL1577; 7000VPK VDE 0884-17), supporting up to 1000VRMS working voltage. The device supports two functional modes: window-comparator mode (VREF ≤ 550mV) and positive-only comparator mode (VREF > 550mV), selected automatically by REF voltage level with built-in hysteresis.

Key Specifications

Pinout & Package

The AMC23C12 is housed in an 8-pin wide-body SOIC package (DWV), measuring 5.85mm × 11.5mm, with reinforced creepage and clearance ≥8.5mm for high-voltage isolation integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated comparator applications.

Compared with AMC1301QDWV and SI8920BD-IS, the AMC23C12 uniquely delivers programmable window thresholds, sub-300ns response, and latch mode in a single reinforced-isolation package-making it optimal for safety-critical, high-dV/dt overcurrent protection where timing and configurability are non-negotiable.

Availability

AMC23C12 is available at Aetrix Electronics and suitable for motor drives, solar inverters, and frequency inverters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for industrial OEM programs.

Supply support for AMC23C12 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 leader specializing in analog, embedded processing, and power management technologies, with deep expertise in isolation, signal conditioning, and high-reliability power-system ICs.

The AMC23C12 belongs to TI's reinforced isolated comparator product line, engineered specifically for fast, accurate fault detection in high-noise, high-voltage power conversion systems such as EV traction inverters and industrial motor controls.

FAQ

What is the maximum adjustable trip threshold range for the AMC23C12?

The AMC23C12 supports an adjustable window-comparator threshold range of ±20mV to ±300mV, set by a single external resistor on the REF pin. This is achieved using the device's internal 100μA ±1% reference current source. In positive-comparator mode (REF > 550mV), the threshold extends up to 2.7V - enabling flexible use for both precision shunt sensing and supply rail monitoring. The AMC23C12 datasheet specifies ±1% max trip error at 250mV.

How does the AMC23C12 implement latch versus transparent output mode?

The AMC23C12 uses the LATCH pin to select output behavior: when pulled high, the open-drain OUT pin latches after a fault event and remains asserted until the LATCH pin is cycled low; when held low (or tied to GND2), the output operates in transparent mode, tracking the input state in real time. The AMC23C12 requires explicit handling of the LATCH pin - it must never be left floating. This dual-mode capability makes the AMC23C12 suitable for both diagnostic logging and real-time control loops.

What isolation certifications does the AMC23C12 hold, and what do they mean for system design?

The AMC23C12 is certified to DIN EN IEC 60747-17 (VDE 0884-17) for 7000VPK reinforced isolation and UL1577 for 5000VRMS isolation for 1 minute. These certifications validate that the internal capacitive barrier meets rigorous test protocols for partial discharge, surge withstand, and lifetime reliability - allowing designers to meet IEC 61800-5-1, IEC 62109, and UL 62368-1 system-level safety requirements without additional isolation validation. The AMC23C12's 1000VRMS working voltage rating supports direct use in 690VAC industrial drives and 1000VDC solar arrays.

Can the AMC23C12 be used with a 24V high-side supply and 3.3V low-side MCU?

Yes - the AMC23C12 is explicitly specified for high-side supply (VDD1) from 3V to 27V and low-side supply (VDD2) from 2.7V to 5.5V, making it fully compatible with 24V bus monitoring and 3.3V microcontroller interfaces. Its open-drain OUT pin can be pulled up to either 3.3V or 5V, and the LATCH input is 3.3V-tolerant. The AMC23C12's wide supply ranges eliminate level-shifters and reduce bill-of-materials in mixed-voltage systems.

What is the significance of the 55V/ns CMTI specification for the AMC23C12?

The 55V/ns minimum common-mode transient immunity (CMTI) means the AMC23C12 reliably rejects fast voltage transients across its isolation barrier - critical in SiC and GaN inverter applications where dV/dt exceeds 50kV/μs. This specification ensures the AMC23C12 maintains correct logic state during switching edge-induced noise, preventing false trips or missed faults. Measured with |VIN – VREF| ≥ 4mV and 10kΩ pull-up, the AMC23C12's CMTI performance directly enables robust operation in high-frequency, high-power converter topologies.