STE Y1 and Y2 Capacitors Featured in Charger Industry Roundup

A June 2025 Chongdiantou roundup examined surface mount Y capacitors from STE, TRX and JingQin as designers continued to seek compact fast-charging power supplies. STE's contribution covered the SMD-X1Y1 and SMC-X1Y2 families, with different safety classes and package options.

The source emphasized the manufacturing advantages of a surface mount format. This English edition focuses on the selection information an engineer needs: the required safety class, available capacitance in a specific outline and the difference between an operating rating and a test condition.

Two STE families with different selection roles

The SMD-X1Y1 family provides Y1 options, while SMC-X1Y2 provides Y2 options. A designer must select the class required by the equipment's insulation arrangement before considering size. A common capacitance value does not establish that the two families can replace one another.

The package-specific STE specifications give the following examples:

These are nominal body dimensions, not maximum heights or complete footprints. Use the tolerances and terminal drawings in the individual datasheet. The capacitance range also depends on dielectric and tolerance options. The SMC family-wide electrical range must not be read as availability of every capacitance in each package.

Put test claims in their proper context

The original coverage discussed withstand performance, insulation resistance and environmental tests. Such results are useful only with the test conditions and the product variant attached. For example, a short-duration AC withstand test is separate from a continuous AC working rating.

Similarly, reporting a thermal cycling test does not establish complete automotive qualification for all capacitance and package combinations. Qualification and approvals need to be tied to the part being considered.

Surface mount assembly can support automated production, but the finished board still needs a suitable process window. Placement, soldering, mechanical stress and local component temperature all belong in the qualification plan. Production savings or yield improvements require measurements from that process.

TRX: Y1 and Y2 package families

The TRX section describes Y1 products with 250 V/400 V voltage entries and a −40 to +125°C operating range. It gives 10–2200 pF for package 7854 and 680–10000 pF for 10596, with consumer, industrial and automotive product grades. The source emphasizes small size, low weight and vibration resistance, and names coupling, bypass, filtering, DC blocking and other circuit uses. A circuit still needs the correct safety class and a grade supported by its own documentation.

Its Y1 application links cover EcoFlow RAPID 65 W 2C1A, Philips 100 W 2C1A, Lenovo Legion 170 W, Xiaomi 90 W 2C1A and HP 96 W USB-C GaN chargers. These examples belong to TRX's portion of the roundup.

For Y2, the source gives a 300 V voltage entry and the same temperature range. Consumer and industrial selections use 4335, 4539, 6056 and 10596 packages; the reported capacitance groups are 22–2200 pF, 22–2200 pF, 680–4700 pF and 10000 pF, respectively. Automotive selections use 4539, 6056 and 10596. The source's prose lists 10–2000 pF, 100–4700 pF and 10000 pF for those groups; the accompanying translated model tables preserve the individual printed selections rather than treating the prose as an ordering specification.

The Y2 application links concern an iQOO 120 W GaN charger, OnePlus 100 W 1A1C charger, Nothing CMF 65 W 2C1A charger, OPPO 33 W 1A1C UFCS charger and Ninebot 1080 W e-bike charger. Related reading describes TRX's three product grades and published applications. References to safety approvals and automotive grades remain part-specific claims from the source.

JingQin: single, series and parallel capacitor arrangements

JingQin's Y1 range is described with a 500 VAC rating and three internal arrangements: a single Y1 element, two Y1 elements in series, and two in parallel for higher capacitance. The stated capacitance ranges are 10–2200 pF, 50–2200 pF and 100–4700 pF, respectively. The source highlights multiple dielectrics and packages, compact construction, humidity/temperature performance and voltage withstand. Its application links identify GOSIRY 45 W and 50 W dual-USB-C GaN chargers.

The Y2 section gives 300 VAC and four arrangements: one Y2 element, two in series, two in parallel, and two in series with an external ground termination. The reported ranges are 10–10000 pF, 5–5000 pF, 100–10000 pF and 5–5000 pF, respectively. The original Y2 prose repeats Y1/X1 family strings; this edition describes the internal arrangements without presenting those inconsistent strings as verified Y2 order codes. The source tables retain the product distinctions.

STE application examples and manufacturing context

The STE Y1 section links to ROMOSS 65 W 2C1A, BULL 45 W USB-C and Motorola 90 W USB-C GaN charger teardowns, plus a BULL 20 W 2A1C GaN extension power strip. It also names 3222 and 4522 packages alongside 3225, reports capacitance up to 4700 pF across the family, and describes UL94 V-0 epoxy encapsulation and tape-and-reel supply. Its 85°C/85% RH and 1000-cycle AEC-Q200 thermal-shock references are reported individual tests, not complete automotive qualification.

The source concludes that surface mounting can support automated assembly and reduce material, labor and production-time demands. It supplies no controlled comparison establishing the amount of those savings. The three suppliers' different package and internal-connection choices therefore remain design options requiring their own evaluation, not an interchangeability list.

Product documentation

The numerical examples above use the manufacturer specifications for SMD-X1Y1 3225, SMC-X1Y2 1815 and SMC-X1Y2 2522, revision 2025-03-22, pages 4–6. The source images and translated supplier tables accompany this edition. SMD-X1Y1 3225 SMC-X1Y2 1815 SMC-X1Y2 2522

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.

Jingqin Y2 rows retain the source table’s Y1X1 labels; its later Y2 ordering page uses Y2X1, so confirm the designation with the manufacturer. A family maximum does not apply to every package.

The capacitance range is the overall range printed in the image; consult the package-specific datasheet for available values.

Dimensions are approximate values printed in the source image. Use the package-specific datasheet for dimensions and tolerances.

The capacitance range is the overall range printed in the image; consult the package-specific datasheet for available values.

Dimensions are approximate values printed in the source image. Use the package-specific datasheet for dimensions and tolerances.

Grades and models are transcribed as labeled, without independent qualification verification. The source notes replacement of 4335 by 4539 and a planned discontinuation date of June 30, 2025; confirm current availability with the manufacturer.

Grades and models are transcribed as labeled, without independent qualification verification. The source notes replacement of 4335 by 4539 and a planned discontinuation date of June 30, 2025; confirm current availability with the manufacturer.

Grades and models are transcribed as labeled, without independent qualification verification. The source notes replacement of 4335 by 4539 and a planned discontinuation date of June 30, 2025; confirm current availability with the manufacturer.

Grades and models are transcribed as labeled, without independent qualification verification. The source notes replacement of 4335 by 4539 and a planned discontinuation date of June 30, 2025; confirm current availability with the manufacturer.

Grades and models are transcribed as labeled, without independent qualification verification. The source notes replacement of 4335 by 4539 and a planned discontinuation date of June 30, 2025; confirm current availability with the manufacturer.

Grades and models are transcribed as labeled, without independent qualification verification. The source notes replacement of 4335 by 4539 and a planned discontinuation date of June 30, 2025; confirm current availability with the manufacturer.

The source’s 101 example contains an arithmetic error: the three-digit code 101 represents 10×10¹=100 pF. Patent references are transcribed from the source, without a validity assessment.

Dimensions are transcribed from the source text. Use them with the dimensional drawing and tolerances for the specific model.

The source uses B/E/F for Y5P/Y5U/Y5V respectively. Patent references are transcribed without a validity assessment.

Dimensions are transcribed from the source text. Use them with the dimensional drawing and tolerances for the specific model.

Related reading cited by the original report

Chinese source titles are retained below. 拆解报告：罗马仕65W 2C1A氮化镓充电器 拆解报告：公牛45W USB-C氮化镓快充充电器 拆解报告：摩托罗拉90W USB-C快充充电器 拆解报告：公牛20W 2A1C氮化镓快充延长线插座 松田推出SMD-X1Y1、SMC-X1Y2两款贴片Y电容 小身材，大能量，STE松田电子推出贴片Y电容 拆解报告：正浩RAPID 65W 2C1A氮化镓充电器 拆解报告：飞利浦100W 2C1A氮化镓快充充电器 拆解报告：拯救者170W氮化镓充电器 拆解报告：小米90W 2C1A氮化镓快充充电器 拆解报告：惠普96W USB-C氮化镓快充充电器 挑战百瓦快充体积极限，iQOO 120W 氮化镓闪充拆解 拆解报告：OnePlus一加100W 1A1C超级闪充充电器 拆解报告：Nothing CMF 65W 2C1A氮化镓快充充电器 支持UFCS融合快充，OPPO 33W 1A1C双口氮化镓充电器拆解 拆解报告：九号1080W电动自行车新国标充电器 特锐祥推出消费级、车规级与工业级三个等级的产品 体积小，重量轻，特锐祥贴片Y电容获超百款设备采用 拆解报告：GOSIRY果子理45W双USB-C氮化镓充电器 拆解报告：果子理50W双USB-C氮化镓充电器