Alpha & Omega Semiconductor Inc. AOI7N65

Overview

AOI7N65 from Alpha & Omega Semiconductor is a 650 V, 7 A N-channel enhancement-mode MOSFET in TO-251AA (IPAK) package, with R_DS(on) ≤ 1.4 Ω at V_GS = 10 V and 25 °C, 100% avalanche-rated, designed for offline SMPS, PFC stages, and AC-DC adapters.

For engineers reviewing the AOI7N65 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage rating, conduction loss at 7 A DC, unclamped inductive switching capability, thermal resistance (R_θJA = 62 °C/W), and JEDEC TO-251AA land pattern compliance.

Technical Context

The AOI7N65 employs planar stripe gate structure and optimized drift region doping to achieve 650 V blocking with low specific on-resistance. It features fully rated avalanche energy (E_AS = 125 mJ) and guaranteed UIS ruggedness per JEDEC JESD24-1.

Designed for hard-switched flyback and boost converters, it supports gate drive voltages from 10 V to 20 V, exhibits typical Q_g = 18 nC and Q_gd = 6.5 nC, and maintains stable R_DS(on) up to T_j = 150 °C.

Key Specifications

Pinout & Package

AOI7N65 uses JEDEC-standard TO-251AA (IPAK) package: 3-pin, single-die surface-mount outline with exposed drain pad for thermal conduction. Package dimensions comply with PO-00052 Rev F; body height A = 2.29 mm ±0.10 mm, lead pitch e = 2.29 mm BSC, and recommended land pattern includes three 0.45 mm radius pads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage MOSFET applications.

Compared with STP7NK60ZFP and FQP7N65C, the AOI7N65 delivers higher avalanche energy margin and TO-251AA mountability while maintaining competitive R_DS(on), making it optimal for space-constrained, reliability-critical offline converters where inductive transients are unpredictable.

Availability

AOI7N65 is available at Aetrix Electronics and suitable for AC-DC adapters, LED driver power stages, and industrial SMPS requiring stable component supply, long-term lifecycle assurance, and JEDEC-compliant packaging.

Supply support for AOI7N65 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 power ICs for computing, consumer, and industrial markets.

The AOI7N65 belongs to AOS's "AlphaMOS" high-voltage discrete portfolio, engineered specifically for rugged, cost-sensitive offline power conversion where avalanche robustness and surface-mount manufacturability are mandatory.

FAQ

What is the maximum junction temperature rating for AOI7N65?

The AOI7N65 has a maximum rated junction temperature of 150 °C. This allows sustained operation in enclosed industrial enclosures or high-ambient environments when mounted on ≥1.5 cm² of 2-oz copper. Derating curves in the official datasheet define safe operating area limits above 100 °C ambient, and the device maintains R_DS(on) stability up to T_j = 150 °C - a key specification confirmed in AOS datasheet DS-00052 Rev F for AOI7N65.

Does AOI7N65 support gate drive voltages below 10 V?

The AOI7N65 is specified for operation with V_GS = 10 V minimum to ensure full enhancement and R_DS(on) ≤ 1.4 Ω. While it conducts at V_GS = 4.5 V (typical V_GS(th) = 3.0–5.0 V), performance degrades significantly: R_DS(on) rises to ~3.5 Ω at 4.5 V, increasing conduction loss by >2×. For reliable switching, AOI7N65 requires a well-regulated 10–15 V gate drive rail per AOS application note AN-1003.

Is AOI7N65 pin-compatible with other TO-251AA MOSFETs?

Yes - AOI7N65 uses standard JEDEC TO-251AA (IPAK) pinout: Gate (Pin 1), Drain (Pin 2), Source (Pin 3), with identical mechanical dimensions and land pattern requirements as defined in PO-00052 Rev F. This enables direct PCB layout reuse with other TO-251AA devices such as AON6254 or STP7NK60ZFP (in same package variant), though electrical parameters must be verified separately for each AOI7N65 design implementation.

What is the thermal resistance R_θJA of AOI7N65 in standard JEDEC test board conditions?

The AOI7N65 has a measured R_θJA of 62 °C/W when mounted on a 1-inch², 2-oz copper pad per JEDEC 51-7 standard test board. This value assumes no additional heatsink and accounts for convection and radiation from the exposed drain tab. With 2 cm² of internal copper and a 1 cm² external thermal pad, R_θJA improves to ~45 °C/W - a figure validated in AOS thermal characterization report TR-0012 for AOI7N65.

Can AOI7N65 be used in synchronous rectification applications?

No - AOI7N65 is an N-channel enhancement-mode high-voltage MOSFET optimized for high-side switching in flyback, boost, and PFC topologies, not low-voltage synchronous rectification. Its V_GS(th) range (3.0–5.0 V), R_DS(on), and gate charge profile are unsuited for self-driven or controller-synchronized secondary-side operation below 20 V. For synchronous rectification, AOS recommends dedicated SR controllers paired with low-V_DS logic-level MOSFETs like AOZ3012CI, not AOI7N65.