Introduction
Today, we are tearing down the Hong Kong version of the 40W Dynamic Power Adapter, model A3353, equipped with a UK plug. It supports dynamic power adjustment technology, delivering up to 60W of output. When used with the iPhone 17 series, it can charge the device to approximately 50% in about 20 minutes. This teardown examines its internal structure and components.
Product Appearance
The front of the packaging features the Apple logo, the charger’s name, and an image of the product.
The back of the packaging displays the product image, a diagram of the ports, CE certification information, and other details.
The package includes the charger, a user manual, a list of hazardous substances, and a warranty card.
It features a white glossy casing with a minimalist design.
Both sides have small recessed areas to facilitate plugging and unplugging.
The output side is equipped with a single USB-C port with a white plastic sheet.
The plug area features a recessed design to make it easier to remove the plug.
The bottom is gray and bears the Apple logo.
The UK plug is foldable.
The plug storage slot is printed with product specifications, certifications, and manufacturer information.
Model: A3353
Input: 100–240V~50/60Hz 1.5A (USB PD)
Output: (AVS) 15–20V 2A [3.0A DPS] or (AVS) 9–15V 2.67A [3.0A DPS] or 9V 3A or 5V 3A
Maximum total output power: 60W
It is certified with CE and meets Level VI energy efficiency standards.
The length of the charger is about 46.28 mm (1.82 inches).
The width is about 48.79 mm (1.92 inches).
The thickness is about 39.21 mm (1.54 inches).
Placed side by side with the Chinese version, the two adapters have nearly identical cross-sectional dimensions, but the Hong Kong version is noticeably thicker.
That's how big it is in the hand.
The weight is about 118 g (4.16 oz).
ChargerLAB POWER-Z KM003C shows that it supports PD3.2 and DCP charging protocols.
It has four fixed PDOs of 5V3A, 9V3A, 15V3A, and 20V3A. It also has a set of AVS, which is 9-20V3A.
When used to charge the iPhone 17 Pro Max, the charging power is about 36.49W.
When charging the MacBook Pro, the charging power is about 56.79W, successfully activating the 60W dynamic fast charging feature.
Teardown
Next, let's take it apart to see its internal components and structure.
The bottom casing is removed, and the edges have retaining clips.
The plug module uses a linked mechanism, allowing the live and neutral pins to fold or unfold simultaneously by simply moving the ground pin.
Close-up of the linked lever at the ground pin.
Another area is lined with insulating paper.
Auxiliary retaining springs are installed on both sides of the module to prevent the live and neutral pins from loosening after prolonged use.
The plug module and the PCBA module are electrically connected through direct contact.
A protective rubber pad is placed at the bottom of the PCBA module.
Cut open the casing to remove the PCBA module.
The inner side of the other half of the casing is lined with graphite thermal tape and has been insulated.
The top of the PCBA module is also covered with a protective rubber pad, with cutouts corresponding to the rectifier bridge, inductor, and other components.
The length of the PCBA module is about 40.63 mm (1.6 inches).
The width is about 44.04 mm (1.73 inches).
The thickness is about 24.81 mm (0.98 inches).
The protective rubber pads on the top and bottom of the PCBA module are removed.
The transformer at the center of the module is wrapped in copper foil, with a plastic casing on the secondary side for reinforcement and insulation.
The back of the PCB features a bridge rectifier, differential-mode choke, synchronous rectifier, protocol chip, and VBUS MOSFET.
The central area of the input side has metal contacts for electrical conduction and a supporting plastic frame.
Both sides of the output have Y capacitors and solid capacitors.
The USB-C connector is wrapped with plastic insulating tape.
The common-mode choke, high-voltage filter electrolytic capacitors, transformer, and other components are removed.
The front of the PCB is equipped with an SMD fuse, a master control chip, and other components.
The SMD fuse is from Littelfuse, rated at 3.15 A.
The common-mode choke is used to filter out EMI interference.
Close-up of another common-mode choke.
The safety X2 capacitor has a specification of 0.1 μF and is wrapped in a copper foil shield.
The input-side bridge rectifier is from DIODES, with a custom model RTT10KL, and comes in a TTL package.
The high-voltage filter capacitors are from NCC, rated at 400 V 47 μF, with two units connected in parallel.
The differential-mode choke is rated at 13 μH.
The master control chip is from PI, marked ZN1612F, a custom model for Apple. It integrates the primary controller, high-voltage MOSFET, synchronous rectification controller, and feedback functions, offering high integration and minimal external components, which simplifies fast-charging power supply design. It comes in an InSOP-T28D package.
The capacitor supplying power to the master control chip is from Lelon.
The capacitor is rated at 50 V, 22 μF.
The transformer is manufactured by Sumida.
Close-up of the black Y capacitors.
Close-up of the third capacitor.
The synchronous rectifier is from Onsemi, model NTMFS3D6N10MCL, an NMOS with a voltage rating of 100 V and an on-resistance of 3.6 mΩ, in a DFN5 package.
The three output filter solid capacitors are from Nichicon, each rated at 25 V, 270 μF.
The protocol chip is from Infineon, model CYPDC1185B2-32E, in a 32-pin QFN package.
The single operational amplifier marked 8541 comes in an SOT-23 package.
VBUS MOSFET from AOS, model AON7428, NMOS, with a voltage rating of 30V and an on-resistance of 2.8 mΩ, packaged in DFN3.3 × 3.3EP.
Here is the information about AOS AON7428.
This sampling resistor is used to measure the charger's output current, with a thermistor located in the top-left corner.
The USB-C connector pins are extended and soldered onto the PCBA.
Close-up of the USB-C connector.
Well, those are all components of the Apple 40W Dynamic Power Adapter (A3365, HK Version).
Summary of ChargerLAB
Here is the component list of the Apple 40W Dynamic Power Adapter (A3365, HK Version) for your convenience.
It continues Apple’s classic design, featuring foldable UK-style plug pins. The key selling point is its support for dynamic fast-charging technology, enabling intelligent power regulation with “peak 60 W, stable 40 W.”
After taking it apart, we found that it uses the highly integrated PI power management IC ZN1612F as the controller, paired with the Infineon CYPDC1185B2-32E protocol chip to manage output, and assisted by NCC and Nichicon capacitors for filtering.
The UK plug pins feature an interlinked folding mechanism: sliding the ground pin allows the live and neutral pins to extend or retract simultaneously. The operation feels smooth, and the internal spring mechanism effectively prevents looseness after long-term use.
The PCBA module has a compact layout, with graphite thermal pads applied internally, along with protective rubber cushions and plastic brackets, balancing structural strength and thermal performance.
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