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STE Safety Components in Charger and Appliance Teardowns (2025)

Original report

STE edition

Adapted from Chongdiantou

A July 2025 Chongdiantou roundup groups reported STE component use across power adapters, appliances and portable power equipment.

Chongdiantou's July 2025 review organizes reported STE component use into the product groupings in this report, from surface-mount safety capacitors to inrush-limiting thermistors and varistors. The equipment spans phone and computer chargers, robot power supplies, charging stations, portable power products and household appliances.

The following inventory preserves every application entry in the source. It records the publisher's category assignments rather than independently verified ordering codes. C means USB-C and A means USB-A. Names without a confirmed English market equivalent use romanized source labels.

Surface-mount Y1 safety capacitors

The report describes a lower-profile package than conventional leaded Y capacitors, flame-retardant epoxy encapsulation and tape-and-reel packaging. Its manufacturing discussion concerns compatibility with automated assembly; it does not provide a comparative production study. The two listed applications are:

  1. BULL 45 W USB-C GaN charger
  2. Motorola 90 W USB-C charger

X2 safety capacitors

The historical family overview lists 275, 305, 310, 330 and 350 VAC options. It discusses interference suppression across the supply lines and capacitive-dropper applications, together with UL94 V-0, RoHS, REACH and halogen-related claims. The exact construction, intended function and supporting approvals remain variant-specific. Listed equipment:

  1. GPD computer original 100 W GaN charger
  2. Huawei Pura X original 66 W Bing Tang GaN charger
  3. Unitree robot 302.4 W charger
  4. Motorola 90 W USB-C charger
  5. OPPO 100 W Xiaofangping GaN charger
  6. Huntkey 240 W three-C GaN charger
  7. Guozili 50 W dual-C GaN charger
  8. Baseus 67 W three-C GaN charger with retractable cable
  9. Baseus 67 W 10000 mAh power bank with display
  10. REDMAGIC 65 W Deuterium Energy Cube mini
  11. Huawei 100 W multiport charger

CD ceramic Y1 capacitors

Chongdiantou describes the CD family as using a high-permittivity ceramic dielectric and flame-retardant epoxy encapsulation. The article lists 400 and 500 VAC options and associates the family with noise suppression, coupling and bypass applications. Its case list includes:

  1. Beishida K46 45 W USB-C GaN charger
  2. Motorola 50 W 1A1C charger
  3. ARRIS 5 W Ethernet adapter
  4. StarCharge 7 kW AC charging station
  5. Lenovo 45 W USB-C charger
  6. Unitree robot 302.4 W charger
  7. Beishida 45 W USB-C charger described as integrated fast charging
  8. Xiaomi 15 Pro original 90 W GaN charger

CE ceramic Y2 capacitors

The section heading identifies CE, but its first descriptive sentence names CD. This adaptation preserves the CE application grouping while withholding that ambiguous parameter block. It should not be used to establish a CE or CD rating without the exact datasheet. Equipment listed under the CE heading:

  1. Dyson 53.4 W DC adapter
  2. Ninebot 160 W lithium-battery e-bike charger described as meeting the new Chinese standard
  3. Ninebot 1080 W e-bike charger described as meeting the new Chinese standard
  4. Jackery 2 kWh portable power station

CBB21B boxed film capacitors

The source describes a plastic-cased metallized polypropylene family, citing self-healing behavior, high insulation resistance and low high-frequency loss. Its overview lists 0.01–10 µF, an operating range of −40 to +105 °C and storage at 15–35 °C. Those family-level statements do not identify every available combination. The listed application is:

  1. EcoFlow RIVER 3 Plus 600 W 286 Wh portable power station

MF72 thermistors

MF72 thermistors are presented for inrush-current limiting in power-conversion, switching and UPS applications. The report lists disc diameters from 5 to 20 mm. It does not provide the exact thermistor code or operating conditions for each equipment entry:

  1. Panasonic 1200 W hair dryer
  2. BULL 20 W 2A1C GaN extension power strip

Varistors

The article describes varistors for transient overvoltage protection in adapters, appliances, industrial equipment and communications products. It mentions CQC, VDE and UL approvals at family level. An application assessment must establish which approval and pulse conditions apply to the specific part. Its eight examples are:

  1. Huntkey EasyCombo 6S USB extension power strip
  2. Xiaomi 120 W 3C1A GaN charger
  3. Panasonic 1200 W hair dryer
  4. Wofu Xiaohuatong high-speed hair dryer
  5. IKEA SJÖSS 45 W dual-port charger
  6. Mijia 1600 W high-speed hair dryer
  7. HONOR 66 W SuperCharge charger
  8. Huawei 100 W Bing Tang GaN charger

Scope of the report

Together, the entries show how Chongdiantou distributed its reported observations across STE product families. Several products appear more than once because the article associates them with more than one category. These appearances should not be counted as separate equipment designs.

The original introduction also presents historical company and laboratory credentials. This adaptation focuses on the product and equipment coverage rather than treating those broad statements as current certification evidence. The source's further-reading section links a separate STE surface-mount Y capacitor introduction.

For engineering use, follow the original teardown, confirm the component marking and obtain the relevant current specification. Neither the presence of a brand name nor the use of a component in one sample establishes endorsement, production volume or a measured reliability advantage.

Figures and tables from the original report

The following figures retain their original captions, markings and historical context. Transcribed tables present the values shown in the published images; product selection should use the specifications for the selected part.

Illustration from the original report — source figure 1
Figure 1. Illustration from the original report. Image: Chongdiantou. Chongdiantou image source
Illustration from the original report — source figure 2
Figure 2. Illustration from the original report. Image: Chongdiantou. Chongdiantou image source
Illustration from the original report — source figure 3
Figure 3. Illustration from the original report. Image: Chongdiantou. Chongdiantou image source
Illustration from the original report — source figure 4
Figure 4. Illustration from the original report. Image: Chongdiantou. Chongdiantou image source
Illustration from the original report — source figure 5
Figure 5. Illustration from the original report. Image: Chongdiantou. Chongdiantou image source
Illustration from the original report — source figure 6
Figure 6. Illustration from the original report. Image: Chongdiantou. Chongdiantou image source
Illustration from the original report — source figure 7
Figure 7. Illustration from the original report. Image: Chongdiantou. Chongdiantou image source

Related reading cited by the original report

Further reading from the original report (Chinese).

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