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CH345T (SSOP-20) — Symbol, Footprint IPC-7351B & 3D STEP Model

CH345T

WCHID: C5246448SSOP-20 · 20 Pins · Pitch 0.65mmIPC-7351B Verified5.0 (0)
SYNCHRONIZED 4D CROSS-PROBE MODETouch or hover any pin to highlight concurrently across Symbol, Footprint and 3D
1. SYMBOL
U1 · CH345T (SSOP-20)1RST2ACT#3MOUT4MIN5V36UD+7UD-8GND9XI10XO20NOS#19VCC18NC .17GND16ACK15MUX14LEDI13LEDO12NC.11NC.Grid Pitch = 2.54mm (IEEE-315)-15.2-10.2-5.105.110.215.217.812.77.62.5-2.5-7.6-12.7-17.8mm
2. 2D FOOTPRINT
1234567891011121314151617181920E=5.30mm · Pitch e=0.65mmD=7.20mm-6-5-4-3-2-101234566543210-1-2-3-4-5-6mm
3. 3D CAD MODEL
Package Body: 5.30mm × 7.20mm · Pitch: 0.65mm · Ruler Step: 1.00mmSynced <100ms

Synchronized Pinout (Symbol / 2D / 3D) (20/20)

Touch or hover any pin to highlight concurrently across Symbol, Footprint and 3D
PinSymbolTypeFunction (EN)
1RSTI/OMultiplexed I/O & Peripheral Pin RST (General)
2ACT#I/OMultiplexed I/O & Peripheral Pin ACT# (General)
3MOUTI/OMultiplexed I/O & Peripheral Pin MOUT (General)
4MINI/OMultiplexed I/O & Peripheral Pin MIN (General)
5V3PowerRegulated Power Output (V3 — 3.3V to 5V)
6UD+I/OMultiplexed I/O & Peripheral Pin UD+ (USB)
7UD-I/OMultiplexed I/O & Peripheral Pin UD- (USB)
8GNDGNDGround Reference Pin (GND)
9XII/OMultiplexed I/O & Peripheral Pin XI (RTC/CLK)
10XOI/OMultiplexed I/O & Peripheral Pin XO (RTC/CLK)
11NC.I/OMultiplexed I/O & Peripheral Pin NC. (General)
12NC.I/OMultiplexed I/O & Peripheral Pin NC. (General)
13LEDOI/OMultiplexed I/O & Peripheral Pin LEDO (General)
14LEDII/OMultiplexed I/O & Peripheral Pin LEDI (General)
15MUXI/OMultiplexed I/O & Peripheral Pin MUX (General)
16ACKI/OMultiplexed I/O & Peripheral Pin ACK (General)
17GNDGNDGround Reference Pin (GND)
18NC .I/OMultiplexed I/O & Peripheral Pin NC . (General)
19VCCPowerPower Supply Input (VCC — 3.3V to 5V)
20NOS#I/OMultiplexed I/O & Peripheral Pin NOS# (General)
PIN 1 RST
I/O
Multiplexed I/O & Peripheral Pin RST (General)
Design note: Signal terminal RST (I/O, 3.3V to 5V domain). Multiplexed alternate functions: RST. Supported peripheral buses: General.
IPC-7351B Solder Density & Span C/G/Z Tuner

Live Embedded Datasheet PDF & Technical Drawing Gallery (6 Standard Drawings + 4 Extracted Figures)

Read the original datasheet PDF directly or click any drawing to view fullscreen
Open PDF in New Window ↗Read Datasheet PDF (.pdf)
PDF VIEWEROfficial Datasheet Document: CH345T (WCH · SSOP-20)
Scroll, search text (Ctrl+F), or expand directly inside the embedded PDF reader below
1. Realistic 3D PackageREPRESENTATIVE
CH345T (SSOP-20) - 1. Realistic 3D Package
Detailed solid 3D bodyExpand ›
2. Standard Pinout (Top View)CLEANROOM PINOUT
CH345T (SSOP-20) - 2. Standard Pinout (Top View)
True package pinout (20 pins)Expand ›
3. Original Datasheet PinoutPDF PINOUT
CH345T (SSOP-20) - 3. Original Datasheet Pinout
Uncropped datasheet pin diagramExpand ›
4. Package Dimensions (D×E×A)PACKAGE DIMENSIONS
CH345T (SSOP-20) - 4. Package Dimensions (D×E×A)
SSOP-20 · 5.30×7.20mm · Pitch 0.65mmExpand ›
5. Recommended Land PatternLAND PATTERN
CH345T (SSOP-20) - 5. Recommended Land Pattern
IPC-7351B Footprint (20 Pads)Expand ›
6. Application SchematicSCHEMATIC
CH345T (SSOP-20) - 6. Application Schematic
Typical Application SchematicExpand ›
Original Datasheet Pinouts & Technical Drawings (4 figures · Page 1/1)
Showing 1–4 of 4 uncropped original figures for CH345
P1 · p01_fig02EXACT PACKAGE
CH345T (SSOP-20) — 封装形式 塑体宽度 引脚间距 封装说明 订货型号
封装形式 塑体宽度 引脚间距 封装说明 订货型号
P1 · p01_fig03EXACT PACKAGE
CH345T (SSOP-20) — 封装形式 塑体宽度 引脚间距 封装说明 订货型号 | SSOP-20 5.30mm 209mil 0.65mm 25mil 超小型20 脚贴片 CH345T | 4、引脚 | 引脚号 引脚名称 类型 引脚说明 | 19 VCC 电源 正电源输入端，需要外接0.1uF 电源退耦电容 8、17 GND 电源 公共接地端，直接连到USB 总线的地线 | 5 V3 电源 在3.3V 电源电压时连接VCC 输入外部电源， | 在5V 电源电压时外接容量为0.1uF 退耦电容
封装形式 塑体宽度 引脚间距 封装说明 订货型号 | SSOP-20 5.30mm 209mil 0.65mm 25mil 超小型20 脚贴片 CH345T | 4、引脚 | 引脚号 引脚名称 类型 引脚说明 | 19 VCC 电源 正电源输入端，需要外接0.1uF 电源退耦电容 8、17 GND 电源 公共接地端，直接连到USB 总线的地线 | 5 V3 电源 在3.3V 电源电压时连接VCC 输入外部电源， | 在5V 电源电压时外接容量为0.1uF 退耦电容
P1 · p01_fig011648×655px
CH345T (SSOP-20) — CH345 是一个USB 转MIDI 芯片。CH345 支持一个MIDI 信号输入通道和两个MIDI 信号输出通道， 用于制作USB 总线的MIDI 键盘，MIDI 音乐回放，以及将MIDI 电子乐器转换为USB 接口。 | 2、特点 | ● 全速USB 设备接口，兼容USB V2.0，外围元器件只需要晶体和电容。 ● 提供一个MIDI 信号输入通道和两个MIDI 信号输出通道。 ● 符合相关规范，计算机端Windows 2000/XP 及以上操作系统下无需安装驱动程序。 ●
CH345 是一个USB 转MIDI 芯片。CH345 支持一个MIDI 信号输入通道和两个MIDI 信号输出通道， 用于制作USB 总线的MIDI 键盘，MIDI 音乐回放，以及将MIDI 电子乐器转换为USB 接口。 | 2、特点 | ● 全速USB 设备接口，兼容USB V2.0，外围元器件只需要晶体和电容。 ● 提供一个MIDI 信号输入通道和两个MIDI 信号输出通道。 ● 符合相关规范，计算机端Windows 2000/XP 及以上操作系统下无需安装驱动程序。 ●
P1 · p01_fig03P1
CH345T (SSOP-20) — Datasheet Page 1 (p01_fig03)
Datasheet Page 1 (p01_fig03)

Technical Specifications & Part Details (CH345T)

Summary of electrical parameters, mechanical dimensions, voltage range and peripheral interfaces from Datasheet (EN)
Standard Electronic & Interconnect Component
Detailed Overview:CH345T (SSOP-20) is a 20-pin standard electronic & interconnect component featuring a 7.20 × 5.30 × 1.85 mm mechanical envelope (lead pitch e = 0.65 mm). Rated for 3.3V to 5V supply operation across -40°C ~ +85°C (Industrial Grade) with integrated USB, RTC/CLK interfaces.
Operating Supply VoltageV_CC / V_DD
3.3V to 5V
Place 100nF + 10µF X7R decoupling capacitors < 2mm from supply pins
Ambient Operating TemperatureT_A
-40°C ~ +85°C (Industrial Grade)
Industrial temperature grade; T_J(max) = +125°C
Clock / RF Operating Frequencyf_CLK / f_RF
12.02 MHz
Extracted from authoritative PDF specification tables
Current & Power RatingI_OUT / I_CC
I_GPIO(max) = ±20 mA / pin | I_VDD(total) ≤ 150 mA
Observe per-pin absolute maximum current limits
Package Envelope (D × E × A)D × E × A
7.20 × 5.30 × 1.85 mm (A1=0.15 mm)
Package family: TSSOP (SSOP-20)
Pin Count & Lead PitchN / e
20 Pins | Pitch e = 0.65 mm (25.6 mil)
Normalized to Center-to-Center Span C per IPC-7351B
Integrated Peripheral InterfacesBuses
USB, RTC/CLK
Cross-linked with 4D Pinout & Schematic Symbol
Reflow & Moisture SensitivityIPC / MSL
IPC-7351B Level B | J-STD-020 (Peak 260°C) | MSL-3
60% windowed solder paste stencil on thermal EPAD
Engineering Safety Alert: Verify Pin-1 chamfer orientation on Top Silkscreen prior to SMT pick-and-place assembly.
Engineering Safety Alert: Connect exposed thermal pad (if present) to internal ground plane via 0.3mm stitched thermal vias.

5-Point Standards Verification

Automated compliance checks prior to export
5/5 PASS
IEEE-315 Symbol20 auto-grouped pins
OK
IPC-7351B Land Pattern20 pads · Pitch 0.65mm
OK
IPC-7525 60% Solder PasteReflow 1:1 Standard
OK
DFM Rules JLCPCB / PCBWayMin pad clearance: 0.25mm
OK
3D STEP AP214 & GLBAligned coordinate origin (0,0,0)
OK

Hardware Verification & Community Engineering Reviews

Summary of electrical parameters, mechanical dimensions, voltage range and peripheral interfaces from Datasheet
5.00 PCB Verified

Mechanical Dimensions & Land Pattern (SSOP-20)

Extracted from Datasheet & IPC-7351B Normalized
mm
Package Body (D × E)Nominal
7.20 × 5.30 mm
Height (A) & Pitch (e)IPC-7351B
A=1.85mm · e=0.65mm
Pad Size (W × L)Level B
0.42 × 1.60 mm
Pins / Total PadsTopology
20P / 20Pad (DUAL_ROW)

Recommended Companion BOM & Drop-In Equivalents

Passive external components per reference schematic and 1:1 pin-compatible alternatives
DFM READY
Designator / Replacement MPNValue / PackageFunction & PCB Layout Rule
N/A
BOM
Per application circuit
SSOP-20
Size power & signal trace widths for rated load current following IPC-2221 clearance rules.

Technical Frequently Asked Questions (FAQ) — CH345T (SSOP-20)

Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formats
IPC-7351B / IEEE-315

What is the Pinout and operating voltage specification of CH345T (SSOP-20)?

Manufactured by WCH, the CH345T is housed in a SSOP-20 package with 20 pins and a 0.65 mm lead pitch, supporting a VCC supply range of 3.3V to 5V. Key pins include: 1 (RST: Multiplexed I/O & Peripheral Pin RST (General)), 2 (ACT#: Multiplexed I/O & Peripheral Pin ACT# (General)), 3 (MOUT: Multiplexed I/O & Peripheral Pin MOUT (General)), 4 (MIN: Multiplexed I/O & Peripheral Pin MIN (General)), 5 (V3: Regulated Power Output (V3 — 3.3V to 5V)), 6 (UD+: Multiplexed I/O & Peripheral Pin UD+ (USB)).

What are the IPC-7351B PCB Footprint dimensions for CH345T?

Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), CH345T (SSOP-20) has a nominal body envelope of 5.30 × 7.20 mm, pitch e = 0.65 mm, and 20 copper pads.

Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for CH345T?

You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for CH345T (WCH, SSOP-20) directly on this page, including KiCad 8 Footprints (.kicad_mod), Schematic Symbols (.kicad_sym), Autodesk Fusion 360 / Eagle (.lbr), and 3D STEP AP214 / WebGL GLB models.

Static Reference Appendix: Pinout Table (20 pins) & CH345 Family VariantsExpand static table
Pin #Signal NameElectrical TypeFunctional Description & Design Notes
1RSTDigital_IOSignal terminal RST (I/O, 3.3V to 5V domain). Multiplexed alternate functions: RST. Supported peripheral buses: General.
2ACT#Digital_IOSignal terminal ACT# (I/O, 3.3V to 5V domain). Multiplexed alternate functions: ACT#. Supported peripheral buses: General.
3MOUTDigital_IOSignal terminal MOUT (I/O, 3.3V to 5V domain). Multiplexed alternate functions: MOUT. Supported peripheral buses: General.
4MINDigital_IOSignal terminal MIN (I/O, 3.3V to 5V domain). Multiplexed alternate functions: MIN. Supported peripheral buses: General.
5V3Power_OutRegulated power output rail (V3) operating in the 3.3V to 5V domain (Max rating: 5.0V).
6UD+Digital_IOSignal terminal UD+ (I/O, 3.3V to 5V domain). Multiplexed alternate functions: UD+. Supported peripheral buses: USB.
7UD-Digital_IOSignal terminal UD- (I/O, 3.3V to 5V domain). Multiplexed alternate functions: UD-. Supported peripheral buses: USB.
8GNDGND0V electrical ground return terminal (GND) for internal core logic, I/O drivers, and analog sub-blocks.
9XIDigital_IOSignal terminal XI (I/O, 3.3V to 5V domain). Multiplexed alternate functions: XI. Supported peripheral buses: RTC/CLK.
10XODigital_IOSignal terminal XO (I/O, 3.3V to 5V domain). Multiplexed alternate functions: XO. Supported peripheral buses: RTC/CLK.
11NC.Digital_IOSignal terminal NC. (I/O, 3.3V to 5V domain). Multiplexed alternate functions: NC.. Supported peripheral buses: General.
12NC.Digital_IOSignal terminal NC. (I/O, 3.3V to 5V domain). Multiplexed alternate functions: NC.. Supported peripheral buses: General.
13LEDODigital_IOSignal terminal LEDO (I/O, 3.3V to 5V domain). Multiplexed alternate functions: LEDO. Supported peripheral buses: General.
14LEDIDigital_IOSignal terminal LEDI (I/O, 3.3V to 5V domain). Multiplexed alternate functions: LEDI. Supported peripheral buses: General.
15MUXDigital_IOSignal terminal MUX (I/O, 3.3V to 5V domain). Multiplexed alternate functions: MUX. Supported peripheral buses: General.
16ACKDigital_IOSignal terminal ACK (I/O, 3.3V to 5V domain). Multiplexed alternate functions: ACK. Supported peripheral buses: General.
17GNDGND0V electrical ground return terminal (GND) for internal core logic, I/O drivers, and analog sub-blocks.
18NC .Digital_IOSignal terminal NC . (I/O, 3.3V to 5V domain). Multiplexed alternate functions: NC .. Supported peripheral buses: General.
19VCCPower_InPrimary positive power supply input (VCC) operating in the 3.3V to 5V domain (Max rating: 5.0V).
20NOS#Digital_IOSignal terminal NOS# (I/O, 3.3V to 5V domain). Multiplexed alternate functions: NOS#. Supported peripheral buses: General.
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