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Home › Teardowns › Chargers & Cables › Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)
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Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)

Rusell
August 28, 2025

Introduction

Recently, we received a GaN charger from Walmart’s Onn. Brand. This charger features three USB-C ports and one USB-A port. Each USB-C port supports 60W PD fast charging and is USB-IF PD certified. It can charge laptops and also supports a 20W+20W+20W output configuration, making it ideal for fast charging three iPhones simultaneously.

The USB-A port delivers 12W output independently, suitable for powering smaller devices like earbuds and smartwatches. Overall, this charger significantly improves charging efficiency. As a product from a globally recognized brand, it uses a full GaN power solution designed by iSmartWare. Let’s take a closer look inside.

Product Appearance

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The front of the packaging displays the brand, design, product name, power rating, and certification marks.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The back shows the specifications.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The package contains only the charger.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The casing is made of flame-retardant PC material, with smooth, rounded corners and a matte finish, featuring a minimalist design.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The input side of the casing also has the specifications printed on it, with the Onn. Logo recessed in the center.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Model: WIAWHT36008513

Input: 100-240V\~50/60Hz 2.0A

Output:

USB-C1/C2/C3: 5V 3A, 9V 3A, 15V 3A, 20V 3A

USB-A: 5V 2.4A

C1 + C2/C3: 20W + 20W

C2 + C3: 20W + 20W

C1/C2/C3 + A: 60W + 12W

C1 + C2/C3 + A: 20W + 20W + 12W

C1/C2 + C3 + A: 20W + 20W + 12W

C1 + C2 + C3: 20W + 20W + 20W

C1 + C2 + C3 + A: 20W + 20W + 20W + 12W

The charger has passed ETL certification and Level VI energy efficiency certification.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

It is equipped with foldable prongs.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The output side features three USB-C ports, one USB-A port, and an indicator light.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The length of the charger is about 60.07 mm (2.36 inches).

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The width is about 50.27 mm (1.98 inches).

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The thickness is about 38.12 mm (1.5 inches). 

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

It is much smaller in size compared to the Apple 61W charger.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

That's how big it is in the hand.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The weight is about 158 g (5.57 oz).

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

When powered on, the indicator light glows blue.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

ChargerLAB POWER-Z KM003C shows that the USB-C1 supports PD3.0 and DCP charging protocols.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

And it has four fixed PDOs of 5V3A, 9V3A, 15V3A, and 20V3A.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The USB-C2 port supports the same protocols as the USB-C1 port.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The PDO reports are also the same.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The USB-C3 port supports the same protocols as well.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The PDO reports are identical as well.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The USB-A supports DCP and Apple 2.4A charging protocols.

Teardown

Next, let's take it apart to see its internal components and structure.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Open the input-side casing, which is ultrasonically welded. The prongs are connected to the PCBA module via wires and secured with a black plastic plate and screws.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Remove the PCBA module. The length is about 56.14 mm (2.21 inches).

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The width is about 45.36 mm (1.79 inches).

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The thickness is about 33.07 mm (1.3 inches). 

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The PCBA module consists of multiple small PCBs. The gaps between the components and the small PCBs are filled with white adhesive for reinforcement.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The back of the module is covered by a copper heat sink, with a Mylar sheet between them for insulation.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

After removing the heat sink, the PCB is found to have adhesive applied. Between the primary and secondary sides is a hollow filled with a Mylar sheet for isolation and insulation.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The adhesive was cleaned off. The transformer is located at the center of the front side.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

On the back side, there are components including a bridge rectifier, master control chip, primary MOSFET, synchronous rectifiers, an optocoupler, and SMD Y capacitors.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Input side overview: the vertical PCB on the right features a filter inductor.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Remove the small PCB. On the front side, there is a time-delay fuse, a safety X2 capacitor, and two common mode chokes.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The back side has no components.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The time-delay fuse is from WalterFuse. 3.15A 250V.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

This common mode choke is dual-wound and used to filter out EMI interference.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The other common mode choke is insulated with a heat-shrink tubing.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The safety X2 capacitor is from HEL. 0.22μF.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The ULBFR810 bridge rectifier is rated at 8A, 1000V, and uses a ULBF package.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Close-up of the filter inductor.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

There are three high-voltage filtering electrolytic capacitors on the module.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

All are manufactured by BERYL. These two are rated at 400V 47μF.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The other one is rated at 400V 33μF.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

This side features the transformer and two solid capacitors.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The master control chip is the SW1106P from iSmartWare. It is a high-frequency quasi-resonant flyback controller that supports direct drive of enhancement-mode GaN FETs. It integrates a 700V high-voltage startup circuit and X-capacitor discharge function. With a built-in 6V GaN driver, it can directly drive GaN FETs.

The SW1106P operates in valley-switching mode with valley lock and includes frequency jitter to improve EMI performance. It supports burst mode and features a dual VDD supply design to reduce power loss under wide USB PD output voltage conditions.

It also integrates comprehensive protection features, including input overvoltage, supply overvoltage, output overvoltage, cycle-by-cycle current limiting, overload, output overcurrent, current sense resistor open/short protection, internal thermal shutdown, and support for external NTC for overtemperature protection.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The iSmartWare SW1106P uses an SSOP10 package and is designed for GaN fast charging, chargers, and switch-mode power supply applications. It expands iSmartWare’s product lineup in the fast-charging power supply sector.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The primary MOSFET is the Navitas NV6145C, rated for 700V with a 210mΩ Rds(on), and comes in a DPAK-4L package.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Close-up of the transformer.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The UPC1009G optocoupler is used for output voltage feedback.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The SMD Y capacitors are from TRX. Their compact size and light weight make them well-suited for high-density power applications such as GaN fast chargers. The part numbers are TMY1471K and TMY1102M, respectively.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The synchronous rectifier controller is the iSmartWare SW1608, a high-performance driver for secondary-side synchronous rectifiers in offline flyback converters. Packaged in SOT23-6, it supports 6V or 9V VCC power with self-supply capability, eliminating the need for an auxiliary winding and supporting a wide output voltage range. Used with MOSFETs to replace Schottky diodes, it significantly improves system efficiency.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The SW1608 supports a 600kHz switching frequency and is suitable for both High Side and Low Side configurations. It operates in multiple modes, including CCM, QR, and DCM. The chip features intelligent conduction detection to prevent false triggering caused by DCM ringing. Additionally, it offers ultra-low turn-off propagation delay and strong pull-down current capability, significantly reducing voltage stress on the rectifiers.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The two synchronous rectifiers, marked N10005D, use a PDFN 5×6 package.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The two solid capacitors for output filtering are also from BERYL, each rated at 25V 680μF.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

All four USB sockets are mounted on separate small PCBs.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Remove all the small PCBs. On the front side of the three USB-C socket PCBs, each has a buck inductor and a secondary filtering solid capacitor.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The back side of each features a buck protocol chip, synchronous buck MOSFETs, and a VBUS MOSFET. All three USB-C PCBs share the same design and components, so only one will be detailed to save space.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The buck protocol chip is the iSmartWare SW3561H, which supports dual USB-C output. It integrates a high-efficiency synchronous buck converter capable of delivering up to 20V/5A and supports USB PD3.1 SPR. Built around an ARM Cortex-M0 core, it includes integrated Type-C logic and supports multiple fast-charging protocols such as PD3.1, QC, SCP, and UFCS, with customizable protocol support.

It enables dual USB-C path control with line loss compensation. When paired with two synchronous buck MOSFETs and corresponding VBUS MOSFETs, it can provide dual-port buck output. The internal buck converter operates at a default frequency of 180kHz, supports custom frequency settings, and can handle up to 100W output—ideal for compact designs. The chip includes comprehensive protection features such as over-temperature, input/output overvoltage and undervoltage, output overcurrent, and data pin overvoltage protection. It comes in a QFN-32 package.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Here is the information about iSmartWare SW3561H.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Both synchronous buck MOSFETs are iSmartWare SWT40N45, housed in a PDFN3030 package.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Close-up of the other one.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Close-up of the buck inductor.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The secondary buck solid capacitor is rated at 25V 150μF.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The output VBUS MOSFET is from ASDsemi, marked 30N40A. The full model is ASDM30N40AE-R, an N-channel MOSFET rated for 30V, housed in a PDFN3.3×3.3-8 package.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The USB-C socket uses through-hole soldering.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The front side of the USB-A socket PCB features a buck inductor and a solid capacitor.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The back side houses a synchronous buck converter.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The synchronous buck converter is the SouthChip SC8101. It supports a wide input voltage range of 5V to 32V and delivers up to 5V/5A output with high efficiency. The output voltage is adjustable, and it features precise output current limiting, entering constant current mode when the set limit is reached. The SC8101 integrates MOSFETs internally, minimizing the need for external components.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Here is the information about SouthChip SC8101.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Close-up of the paired 10μH buck inductor.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

The solid capacitor for output filtering is from APAQ. 6.3V 220μF.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Close-up of the USB-A socket.

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Well, those are all components of the Walmart Onn. 72W Multi-Port GaN Wall Charger.

Summary of ChargerLAB

Teardown of Walmart Onn. 72W Multi-Port GaN Wall Charger (WIAWHT36008513)-Chargerlab

Here is the component list of the Walmart Onn. 72W Multi-Port GaN Wall Charger for your convenience.

It features foldable prongs for easy storage and portability, with three USB-C ports and one USB-A port supporting 60W and 12W output, respectively, for a total output power of 72W. All three USB-C ports are USB-IF PD certified.

After taking it apart, we found that it uses the iSmartWare SW1106P + SW1608 high-frequency QR power solution, paired with a Navitas GaN component. Each of the three USB-C ports utilizes the SW3561H for secondary buck conversion and output control, while the USB-A port adopts a SouthChip SC8101 synchronous buck converter. It also uses capacitors from BERYL and APAQ for filtering. The module is built from multiple PCBs, with adhesive applied between gaps for reinforcement. As a product under Walmart’s Onn. Brand, the build quality and component selection are indeed impressive.

Related Articles:
1. Teardown of HUNDA 300W USB-C GaN Charging Station (A2319-300W-02)
2. Teardown of UGREEN Nexode Car Charger 145W with Retractable USB‑C Cable (EC604)
3. Teardown of Lenovo thinkplus 240W Qlex Dual USB-C Retractable Cable (CBQX240A)

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