Alpha & Omega Semiconductor Inc. AIM702H50B

Overview

AIM702H50B from Alpha & Omega Semiconductor is a 500V, 3-phase intelligent power module (IPM) integrating six αMOS2™ MOSFETs with high-side gate drivers, bootstrap diodes, UVLO, and over-temperature protection. It delivers R_DS(on) ≤ 4.0Ω, 1500V_rms isolation, and operates from -40°C to 150°C junction temperature. It serves as a compact inverter stage for low-power AC motor drives in fan and appliance applications.

For engineers reviewing the AIM702H50B datasheet, pinout, applications, or equivalent options, key selection criteria include its integrated HVIC driver architecture, 1.5A continuous drain current per phase, 16kHz max PWM frequency, and VOT-based temperature monitoring interface compatible with 3.3V/5V MCUs.

Technical Context

The AIM702H50B implements a fully integrated 3-phase inverter with independent high-side and low-side input logic (IN(UH)/IN(UL), etc.), each featuring Schmitt-trigger receivers and 2.5V ON/0.8V OFF thresholds. Its HVIC drivers support bootstrap biasing via integrated diodes and current-limiting resistors on VB(U)/VB(V)/VB(W) pins.

Protection functions are hardware autonomous: control supply UVLO triggers at 11.4V (trip) / 11.9V (reset) for VCC and 10.0V / 11.0V for VBS; over-temperature detection uses an internal LVIC sensing element with VOT output calibrated to 1.05V at 25°C and 2.78V at 90°C across a 10kΩ pull-down.

Key Specifications

Pinout & Package

AIM702H50B is housed in the IPM-7 surface-mount package (18 × 7.5 × 2.5 mm), optimized for thermal dissipation and compact motor control PCB layouts. The module features 19-pin configuration with dedicated high-side and low-side inputs, bootstrap bias rails, isolated power terminals (P/N), phase outputs (U1/U2/V/W), and diagnostic signal (VOT).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-phase inverter module applications.

Compared with FSB50450 and IRSM836-024, the AIM702H50B uniquely combines VOT-based die temperature monitoring, integrated bootstrap diodes with limiting resistors, and dual UVLO protection in a compact IPM-7 package-reducing external component count and simplifying thermal and fault management in fan and appliance inverters.

Availability

AIM702H50B is available at Aetrix Electronics and suitable for fan motor control, small appliance drives, and low-power pump applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AIM702H50B 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

Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, IGBTs, and intelligent power modules for consumer, industrial, and computing markets.

The AIM702H50B belongs to AOS's αMOS2™-based IPM product line, engineered specifically for compact, cost-sensitive 3-phase motor drives where integration of gate drivers, protection, and thermal monitoring reduces system-level design effort.

FAQ

What is the maximum DC bus voltage supported by the AIM702H50B?

The AIM702H50B supports a recommended maximum DC bus voltage of 400V applied between P and N terminals. Its 500V MOSFET breakdown rating provides margin for transient spikes and ensures reliable operation in AC 100–240Vrms input systems where rectified bus voltages reach up to ~340V (240V × √2) and may peak near 400V under surge conditions. Exceeding 400V violates the Recommended Operating Conditions and risks premature failure.

How does the VOT pin function in the AIM702H50B?

The VOT pin on the AIM702H50B outputs an analog voltage proportional to the internal LVIC temperature sensor, ranging from 0.80V at 25°C to 2.92V at 90°C when loaded with a 10kΩ pull-down resistor to COM. This enables direct MCU ADC measurement without signal conditioning. If left unconnected, the internal over-temperature shutdown activates at 130°C (typical), disabling all outputs until reset.

Does the AIM702H50B include built-in bootstrap diodes?

Yes, the AIM702H50B integrates bootstrap diodes on VB(U), VB(V), and VB(W) pins, each with a built-in current-limiting resistor. This eliminates the need for external bootstrap diodes and series resistors, simplifying layout and improving reliability in high-frequency motor drive applications where bootstrap capacitor recharge efficiency is critical.

What protection features are implemented in hardware on the AIM702H50B?

The AIM702H50B implements three hardware protection features: (1) Control supply UVLO with separate thresholds for VCC (trip at 11.4V) and VBS (trip at 10.0V); (2) Over-temperature detection using an internal LVIC sensor that asserts fault when die temperature exceeds 130°C (typical); and (3) Arm shoot-through blocking with 1.5µs minimum dead time enforced by internal logic to prevent cross-conduction.

What is the thermal resistance specification for the AIM702H50B?

The AIM702H50B has a junction-to-case thermal resistance (R_th(j-c)) of 12.5°C/W per MOSFET, measured at the case surface. Its junction-to-ambient thermal resistance (R_th(j-a)) is 39°C/W under standard operating conditions. These values inform heatsink sizing and airflow requirements to maintain T_J ≤ 150°C when dissipating up to 8W total power at T_C = 25°C.