STE Surface Mount Y Capacitors in Compact Charger Design
Original report
STE edition
A three-supplier survey of STE, TRX and JingQin surface-mount Y capacitors, including package architectures, safety classes, reported applications and historical product ranges.
Chongdiantou's December 2023 survey of surface mount Y capacitors placed STE alongside TRX and JingQin in a discussion of thinner, more densely assembled fast chargers. The STE section focused on compact ceramic safety capacitors, surface mount production and potential use across power conversion applications.
The engineering question behind the report remains practical: how can a designer allocate less mechanical space to the EMI filter while retaining the required electrical and insulation performance? Component packaging is part of that decision, together with the PCB layout, circuit connection and manufacturing process.
STE's contribution to the reported product landscape
The article described STE's SMD ceramic safety capacitor construction and reel packaging, including support for automated surface mount assembly. It also reported flame-retardant encapsulation and environmental characteristics. Those statements describe the product presentation at the time; an actual design should use the selected part's drawing, process requirements and approval documentation.
The article named applications including switching power supplies, adapters, lighting, communications equipment and meters. These examples identify the markets considered in the original coverage. They do not establish that every value or package is qualified for every listed use.
| Topic in the STE coverage | What a design team needs to establish |
|---|---|
| Compact surface mount construction | Body dimensions, terminal geometry, land pattern and surrounding clearance |
| Ceramic safety capacitor function | Required safety class and the circuit connection it must serve |
| Reel packaging and automated assembly | Compatible soldering profile, placement process and board support |
| Environmental performance | Exact test conditions and limits for the selected part |
TRX: Y1, Y2 and high-voltage ceramic products
The historical profile describes Sichuan TRX as established in 2014 in Mianyang, with RMB 100 million registered capital and a predecessor business founded in Shenzhen in 2004. It identifies SMD TRX and leaded TY capacitor brands, ceramic-material development and applications in switching supplies, LED lighting, UPS equipment, electronic ballasts, household-appliance controls and security equipment.
The source reports ISO 9001, ISO 14001, ISO 45001 and QC 08000 management-system certifications, together with CQC, UL/CUL, VDE, ENEC and KC product approvals. These references describe reported historical coverage; a product family's exact approval scope remains separate from the company's management systems.
TRX's molded SMD-Y1 construction places the ceramic element horizontally and brings out two terminals for surface mounting. The article describes an L-shaped terminal form, reduced body-height and dimensional variation, and compatibility with reflow and wave soldering. Its standard 7854 range is reported as 2–2200 pF, while high-capacitance 10596 covers 680–10000 pF. The example body measures 10.5 × 9.6 × 2.58 mm. The narrative pairs “102K” with 10000 pF/Y5V/±20%, an inconsistent combination; the translated product table is retained for individual values rather than treating that sentence as a valid complete part specification.
The SMD-Y2 discussion gives 2–2200 pF for 4335 and 680–4700 pF for 6056. A cited iQOO 120 W GaN charger teardown reports two TBY2101KB parts and two TBY2331KB parts. The source reports a 26% reduction in charger volume, 35 g lower weight and 1.31 W/cm³ power density for that equipment comparison. These finished-product figures do not isolate the contribution of the capacitors.
TRX also presents a high-voltage ceramic family with a 4.3 × 3.5 × 2.2 mm body, 47–2200 pF options and reported voltage choices from 1 to 3 kV. The source describes these as compact alternatives to leaded high-voltage ceramic parts; their voltage class does not itself make them Y safety capacitors. Related reading covers TRX's high-capacitance Y1 introduction and the Y2/high-voltage ceramic launch.
JingQin: four internal arrangements
The JingQin profile dates the business to 2013, with research in Shenzhen and a Huizhou factory entering production in 2019. It describes surface-mount varistors, thermistors and X/Y safety capacitors, with patents for multi-element capacitor and thermistor arrangements. Reported management systems include ISO 9001:2015, ISO 14001:2015 and IATF 16949. The source also lists product safety and environmental-compliance claims, without establishing their current scope for each component.
Its laboratory description covers surge-current and combination-wave testing, destructive voltage testing, pulse tests, 85°C/85% RH exposure, high-temperature endurance, thermal shock, salt spray and vibration. Stated applications include LED protection, industrial and switching supplies, 5G infrastructure, consumer electronics, appliances and automotive electronics.
The product section distinguishes four Y1 arrangements. A single-element 2822 version uses gull-wing terminals and a reported 7 × 5.6 × 2.4 mm body. A single-element 4524 uses inward-bent terminals and measures 11.4 × 6 × 2.4 mm. Both are described with 10–2200 pF and a 500 V rating. A two-element parallel 4524 arrangement increases available capacitance, with examples labeled Y5P-102K, Y5U-222M, Y5U-332M and Y5V-472M. A two-element series 4524 arrangement is presented as a way to combine two Y functions in one package, with a reported 10–2200 pF range and 500 V rating. Its suitability still depends on the required circuit and insulation arrangement.
The source describes UL94 V-0 encapsulation, tape-and-reel supply, automated assembly and high-temperature/humidity performance across this product presentation. Its cost, reliability and space-saving comparisons are supplier claims, not independently measured results in the article. Individual dimensions and model entries are preserved in the translated source tables.
Company and exhibition context
The STE profile identifies the Shantou bonded-zone company founded in 2012 and reports a 75,000 m² development and production campus. It names ceramic and film capacitors, varistors and thermistors, provincial and municipal engineering-center recognitions, UL-recognized laboratories, and company management and product-safety certifications. These are historical company statements; they do not extend every certification to every SMD option.
The original exhibition invitations concerned the March 20–22, 2024 Asia Charging Expo: TRX at C35/C36/C47/C48, JingQin at C67 and STE at B62. They are historical notices. The original's further-reading section also linked to previews of capacitor, wireless-charging, charging-solution, semiconductor and specialist-enterprise exhibitors.
Using the historical report today
The letter Y identifies a safety capacitor category; it is not an abbreviation for a claimed level of electromagnetic compatibility. A Y capacitor can provide a path for high-frequency common-mode current, subject to the equipment's insulation and permitted-current requirements. The required class must be selected for the actual connection.
STE's present package-specific information is available through the SMD-X1Y1 and SMC-X1Y2 product pages. These references allow a reader to move from historical reporting to a particular component specification. SMD-X1Y1 SMC-X1Y2
The original article also announced STE's participation in the spring 2024 Asia Charging Expo. That invitation belongs to the article's publication period and is retained in the Chinese source as historical context.
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.
| Field | Source description |
|---|---|
| Example part number | TGY1102K |
| T | TRX |
| G | High capacitance |
| Y1 | Y1 safety class |
| 102 | 1000 pF |
| K | ±10% |
| SMD | Plastic package with L-shaped surface-mount leads |
| AC | Alternating current |
| Rated voltage | 400 V (250 V) |
Source: TRX-3-079, B1, 2019-09-15, page 5/22.
| Field | Source description |
|---|---|
| Brand / model reference | TRX |
| Dielectric code | B (Y5P) / E (Y5U) / F (Y5U) |
| Class | Y1 |
| Nominal capacitance | 680–10000 pF |
| Tolerance | K (±10%) / M (±20%) |
| Approval marks shown | UL / CQC / ENEC / KC |
| Voltage markings | 400 VAC / 250 VAC |
| Date-code example | NB210831 (added as required) |
The source labels F as Y5U; this is retained and requires manufacturer confirmation. Approval marks are transcribed from this historical image and do not establish current approval scope.
| No. | Customer P/N | Ordering code | Product description | Package code |
|---|---|---|---|---|
| 1 | / | TMY1100J | SMD Y1-SL100J/AC400V | 7854 |
| 2 | / | TMY1220J | SMD Y1-SL220J/AC400V | 7854 |
| 3 | / | TMY1470J | SMD Y1-SL470J/AC400V | 7854 |
| 4 | / | TMY1680J | SMD Y1-SL680J/AC400V | 7854 |
| 5 | / | TMY1101K | SMD Y1-Y5P101K/AC400V | 7854 |
| 6 | / | TMY1221K | SMD Y1-Y5P221K/AC400V | 7854 |
| 7 | / | TMY1331K | SMD Y1-Y5P331K/AC400V | 7854 |
| 8 | / | TMY1471K | SMD Y1-Y5P471K/AC400V | 7854 |
| 9 | / | TMY1471M | SMD Y1-Y5U471M/AC400V | 7854 |
| 10 | / | TMY1681M | SMD Y1-Y5U681M/AC400V | 7854 |
| 11 | / | TMY1102M | SMD Y1-Y5U102M/AC400V | 7854 |
| 12 | / | TMY1152M | SMD Y1-Y5U152M/AC400V | 7854 |
| 13 | / | TMY1222M | SMD Y1-Y5V222M/AC400V | 7854 |
SL is Class I; Y5P/Y5U/Y5V are Class II. Every customer P/N cell contains only the source placeholder “/”.
| No. | Customer P/N | TRX P/N | Product description | Package code |
|---|---|---|---|---|
| 1 | / | TGY1681K | SMD-Y1Y5P681K/AC400V | 10596 |
| 2 | / | TGY1102K | SMD-Y1Y5P102K/AC400V | 10596 |
| 3 | / | TGY1222M | SMD-Y1Y5U222M/AC400V | 10596 |
| 4 | / | TGY1332M | SMD-Y1Y5U332M/AC400V | 10596 |
| 5 | / | TGY1472M | SMD-Y1Y5U472M/AC400V | 10596 |
| 6 | / | TGY1103M | SMD-Y1Y5V103M/AC400V | 10596 |
Unused blank rows 7–12 are omitted.
| Field | Source description |
|---|---|
| L (mm) | 7.0±0.1 |
| W (mm) | 5.6±0.1 |
| T (mm) | 2.4±0.1 |
| L1 (mm) | 9.5±0.2 |
| L2 (mm) | 8.5±0.2 |
| FL (mm) | 0.5±0.2 |
| FW (mm) | 2.5±0.1 |
| Capacitance range | 10–2200 pF |
| Rated voltage | 500 VAC |
Source: QC-T4-09, version 1.0. Dimension symbols follow the source drawing.
| Field | Source description |
|---|---|
| L (mm) | 11.4±0.3 |
| W (mm) | 6.0±0.3 |
| T (mm) | 2.4±0.1 |
| F (mm) | 10±0.3 |
| FL (mm) | 0.7±0.3 |
| FW (mm) | 2.5±0.3 |
| Capacitance range | 10–2200 pF |
| Rated voltage | 500 VAC |
Source: QC-T4-09, version 1.0. Dimension symbols follow the source drawing.
| Field | Source description |
|---|---|
| L (mm) | 11.4±0.3 |
| W (mm) | 6.0±0.3 |
| T (mm) | 2.4±0.1 |
| F (mm) | 10±0.3 |
| FL (mm) | 0.7±0.3 |
| FW (mm) | 2.5±0.3 |
| Capacitance range | Y5P-102K; Y5U-222M; Y5U-332M; Y5V-472M |
| Rated voltage | 500 VAC |
Source: QC-T4-09, version 1.0. Dimension symbols follow the source drawing.
| Field | Source description |
|---|---|
| L (mm) | 11.4±0.3 |
| W (mm) | 6.0±0.3 |
| T (mm) | 2.4±0.1 |
| F (mm) | 10±0.3 |
| FL (mm) | 0.7±0.3 |
| FW (mm) | 2.5±0.3 |
| Capacitance range | Dual-Y: 10–2200 pF |
| Rated voltage | 500 VAC |
Source: QC-T4-09, version 1.0. Dimension symbols follow the source drawing.
| Temperature characteristic | Nominal capacitance (pF) | Model | Note |
|---|---|---|---|
| SL | 10 | ST1Y1SL100J500VAC | |
| SL | 22 | ST1Y1SL220J500VAC | |
| SL | 47 | ST1Y1SL470J500VAC | |
| SL | 56 | ST1Y1SL560J500VAC | |
| SL | 68 | ST1Y1SL680J500VAC | |
| SL | 100 | ST3Y1SL101J500VAC | |
| Y5P | 100 | ST1Y1Y5P101K500VAC | |
| Y5P | 100 | ST2Y1Y5P101K500VAC | Dual-Y |
| Y5P | 120 | ST1Y1Y5P121K500VAC | |
| Y5P | 120 | ST2Y1Y5P121K500VAC | Dual-Y |
| Y5P | 150 | ST1Y1Y5P151K500VAC | |
| Y5P | 150 | ST2Y1Y5P151K500VAC | Dual-Y |
| Y5P | 200 | ST1Y1Y5P201K500VAC | |
| Y5P | 200 | ST2Y1Y5P201K500VAC | Dual-Y |
| Y5P | 220 | ST1Y1Y5P221K500VAC | |
| Y5P | 220 | ST2Y1Y5P221K500VAC | Dual-Y |
| Y5P | 270 | ST1Y1Y5P271K500VAC | |
| Y5P | 270 | ST2Y1Y5P271K500VAC | Dual-Y |
| Y5P | 330 | ST1Y1Y5P331K500VAC | |
| Y5P | 330 | ST2Y1Y5P331K500VAC | Dual-Y |
| Y5P | 330 | ST3Y1Y5P331K500VAC | |
| Y5P | 390 | ST1Y1Y5P391K500VAC | |
| Y5P | 390 | ST2Y1Y5P391K500VAC | Dual-Y |
| Y5P | 390 | ST3Y1Y5P391K500VAC | |
| Y5P | 470 | ST1Y1Y5P471K500VAC | |
| Y5P | 470 | ST2Y1Y5P471K500VAC | Dual-Y |
| Y5P | 470 | ST3Y1Y5P471K500VAC | |
| Y5P | 560 | ST3Y1Y5P561K500VAC | |
| Y5P | 680 | ST3Y1Y5P681K500VAC | |
| Y5P | 820 | ST3Y1Y5P821K500VAC | |
| Y5P | 1000 | ST3Y1Y5P102K500VAC | |
| Y5U | 470 | ST1Y1Y5U471M500VAC | |
| Y5U | 470 | ST2Y1Y5U471M500VAC | Dual-Y |
| Y5U | 560 | ST1Y1Y5U561M500VAC | |
| Y5U | 560 | ST2Y1Y5U561M500VAC | Dual-Y |
| Y5U | 680 | ST1Y1Y5U681M500VAC | |
| Y5U | 680 | ST2Y1Y5U681M500VAC | Dual-Y |
| Y5U | 820 | ST1Y1Y5U821M500VAC | |
| Y5U | 820 | ST2Y1Y5U821M500VAC | Dual-Y |
| Y5U | 1000 | ST1Y1Y5U102M500VAC | |
| Y5U | 1000 | ST2Y1Y5U102M500VAC | Dual-Y |
| Y5U | 1500 | ST1Y1Y5U152M500VAC | |
| Y5U | 2200 | ST3Y1Y5U222M500VAC | |
| Y5U | 3300 | ST3Y1Y5U332M500VAC | |
| Y5V | 1000 | ST1Y1Y5V102M500VAC | |
| Y5V | 1000 | ST2Y1Y5V102M500VAC | Dual-Y |
| Y5V | 1500 | ST1Y1Y5V152M500VAC | |
| Y5V | 1500 | ST2Y1Y5V152M500VAC | Dual-Y |
| Y5V | 2200 | ST1Y1Y5V222M500VAC | |
| Y5V | 3300 | ST3Y1Y5V332M500VAC | |
| Y5V | 4700 | ST3Y1Y5V472M500VAC |
This table preserves historical models shown in the 2023 article. Use the current datasheet for the exact package when selecting a part.
Related reading cited by the original report
Chinese source titles are retained below. 特锐祥发布高容超薄贴片Y1电容 特锐祥推出贴片式Y2电容和贴片高压瓷片电容 小身材，大能量，STE松田电子推出贴片Y电容 10家电容企业参加2024（春季）亚洲充电展 10家无线充工厂将在2024（春季）亚洲充电展发布数百款新品 7大快充、无线充电方案企业闪耀2024春季亚洲充电科技盛典 36家芯片企业强势集结2024亚洲充电展 46家专精特新企业参加2024（春季）亚洲充电展