# TMCC WiFi DCC 5A Module

## Description

Per\-locomotive 18 VAC input module that regenerates a 5 A bipolar DCC output using an ESP32 WiFi module and DRV8873 H\-bridge, targeting standard PCB assembly\.

## Project Details

- **Owner:** wcom939
- **Created:** 7/3/2026
- **Last Updated:** 8/4/2026
- **Visibility:** Public

## Key Components

### D1 — [SS510](https://flux.ai/lcsc/ss510~q4ky.md)

- Role Details: One of four SS510 diodes forming the 18 VAC input bridge\.
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/e155e7a04581f4592e924380964bedd3d10b86fa357921e1a5be474870d9bdd9\.pdf
- Part Type: Schottky Barrier Diodes \(SBD\)
- Manufacturer Name: LGE
- Package or Case Code: SMC\_L6\.9\-W5\.9\-LS7\.9\-R\-RD
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C717458
- Manufacturer Part Number: SS510
- Role: Bridge Rectifier Diode
- Product Info Url: https://jlcpcb\.com/partdetail/LGE\-SS510/C717458

**Pins:**
- A [pin 1]
- K [pin 2]

### D2 — [SS510](https://flux.ai/lcsc/ss510~q4ky.md)

- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/e155e7a04581f4592e924380964bedd3d10b86fa357921e1a5be474870d9bdd9\.pdf
- Part Type: Schottky Barrier Diodes \(SBD\)
- Manufacturer Name: LGE
- Package or Case Code: SMC\_L6\.9\-W5\.9\-LS7\.9\-R\-RD
- JLCPCB Part Class: Extended Part
- Product Info Url: https://jlcpcb\.com/partdetail/LGE\-SS510/C717458
- LCSC Part Number: C717458
- Role: Bridge Rectifier Diode
- Manufacturer Part Number: SS510
- Role Details: One of four SS510 diodes forming the 18 VAC input bridge\.

**Pins:**
- A [pin 1]
- K [pin 2]

### D3 — [SS510](https://flux.ai/lcsc/ss510~q4ky.md)

- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/e155e7a04581f4592e924380964bedd3d10b86fa357921e1a5be474870d9bdd9\.pdf
- Part Type: Schottky Barrier Diodes \(SBD\)
- Role Details: One of four SS510 diodes forming the 18 VAC input bridge\.
- Manufacturer Name: LGE
- Role: Bridge Rectifier Diode
- Product Info Url: https://jlcpcb\.com/partdetail/LGE\-SS510/C717458
- Package or Case Code: SMC\_L6\.9\-W5\.9\-LS7\.9\-R\-RD
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C717458
- Manufacturer Part Number: SS510

**Pins:**
- A [pin 1]
- K [pin 2]

### D4 — [SS510](https://flux.ai/lcsc/ss510~q4ky.md)

- Role Details: One of four SS510 diodes forming the 18 VAC input bridge\.
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/e155e7a04581f4592e924380964bedd3d10b86fa357921e1a5be474870d9bdd9\.pdf
- Part Type: Schottky Barrier Diodes \(SBD\)
- Manufacturer Name: LGE
- Product Info Url: https://jlcpcb\.com/partdetail/LGE\-SS510/C717458
- Role: Bridge Rectifier Diode
- Package or Case Code: SMC\_L6\.9\-W5\.9\-LS7\.9\-R\-RD
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C717458
- Manufacturer Part Number: SS510

**Pins:**
- A [pin 1]
- K [pin 2]

### D5 — [SMBJ43A](https://flux.ai/lcsc/smbj43a~rv2y.md)

- LCSC Part Number: C123821
- Product Info Url: https://lcsc\.com/product\-detail/TVS\_Jiangsu\-Yutai\-Elec\-SMBJ43A\_C123821\.html
- Manufacturer Part Number: SMBJ43A
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2407291901\_MDD\-Microdiode\-Semiconductor\-SMBJ43A\_C123821\.pdf
- Functional Group: Power Input Protection
- Part Type: TVS
- JLCPCB Part Class: Extended Part
- Package or Case Code: SMB\_L4\.6\-W3\.6\-LS5\.3\-RD
- Manufacturer Name: MDD

**Pins:**
- A [pin 2]
- C [pin 1]

### F1 — [ICP T6\.3A250V](https://flux.ai/lcsc/icp-t6p3a250v~zpu.md)

- Manufacturer Part Number: ICP T6\.3A250V
- Functional Group: Power Input Protection
- Role Details: T6\.3A 250V input fuse; manual installation/excluded from CPL; sized for 60W output and rectifier charging pulses\.
- Role: Input Protection
- Product Info Url: https://lcsc\.com/product\-detail/Others\_Walter\-Elec\-ICP6\-3A250V\_C354917\.html
- LCSC Part Number: C354917
- Package or Case Code: FUSE\-TH\_BD3\.9\-L11\.0\-P15\.00\-D0\.6
- JLCPCB Part Class: Extended Part
- Manufacturer Name: WALTER\(华德\)
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2409272202\_Walter\-Elec\-ICP\-T6\-3A250V\_C354917\.pdf
- Part Type: Cartridge Fuses
- Exclude from Pick & Place: true

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J1 — [B2P\-VH\(LF\)\(SN\)](https://flux.ai/lcsc/b2p-vhlfsn~n4oo.md)

- Operating Temperature: \-25 \~ \+85℃
- Connector Rows: 1
- Role Details: 18 VAC track pickup input, 5 A class\.
- Connector Type: Header
- Part Type: Wire To Board / Wire To Wire Connector
- Role: Power Input Connector
- Package or Case Code: CONN\-TH\_B2P\-VH\-LF\-SN
- Connector Positions: 2
- Manufacturer Name: JST
- Manufacturer Part Number: B2P\-VH\(LF\)\(SN\)
- LCSC Part Number: C160315
- Connector Pitch: 3\.96mm
- Connector Gender: Male
- JLCPCB Part Class: Extended Part
- Product Info Url: https://lcsc\.com/product\-detail/\_JST\_B2P\-VH\-LF\-SN\_B2P\-VH\-LF\-SN\_C160315\.html
- Voltage Rating: 250V
- Current Rating: 10A
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_JST\-B2P\-VH\-LF\-SN\_C160315\.pdf

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J2 — [B2P\-VH\(LF\)\(SN\)](https://flux.ai/lcsc/b2p-vhlfsn~n4oo.md)

- Role: Power Output Connector
- Operating Temperature: \-25 \~ \+85℃
- Connector Rows: 1
- Role Details: Bipolar DCC A/B output to stock decoder, 5 A class\.
- Connector Type: Header
- Part Type: Wire To Board / Wire To Wire Connector
- Package or Case Code: CONN\-TH\_B2P\-VH\-LF\-SN
- Connector Positions: 2
- Manufacturer Name: JST
- Manufacturer Part Number: B2P\-VH\(LF\)\(SN\)
- LCSC Part Number: C160315
- Connector Pitch: 3\.96mm
- Connector Gender: Male
- JLCPCB Part Class: Extended Part
- Product Info Url: https://lcsc\.com/product\-detail/\_JST\_B2P\-VH\-LF\-SN\_B2P\-VH\-LF\-SN\_C160315\.html
- Voltage Rating: 250V
- Current Rating: 10A
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_JST\-B2P\-VH\-LF\-SN\_C160315\.pdf

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### LED1 — [Generic LED SMD](https://flux.ai/jharwinbarrozo/generic-led-smd~ku.md)

- Part Type: LED
- Manufacturer Name: Hubei KENTO Elec
- Forward Voltage: 2V
- Role Details: RED 3\.3 V power\-present LED; driven through existing 1k series resistor\. LED1 remains the power indicator\.
- LCSC Part Number: C2286
- Manufacturer Part Number: KT\-0603R
- JLCPCB Part Class: Basic Part
- Role: Indicator
- Package: LED\_0603\_1608Metric
- Current: 1\.3mA

**Pins:**
- A [pin 2]
- K [pin 1]

### LED2 — [Generic LED SMD](https://flux.ai/jharwinbarrozo/generic-led-smd~ku.md)

- Part Type: LED
- Manufacturer Name: Hubei KENTO Elec
- Forward Voltage: 3\.1V
- Role Details: BLUE ESP32 GPIO16 activity LED; driven through existing 1k series resistor\. LED2 remains the GPIO16 activity indicator\.
- LCSC Part Number: C2288
- Manufacturer Part Number: KT\-0603B
- Package: LED\_0603\_1608Metric
- Current: 0\.0002A
- JLCPCB Part Class: Basic Part
- Role: Indicator

**Pins:**
- A [pin 2]
- K [pin 1]

### Q1 — [SED10070GG](https://flux.ai/lcsc/sed10070gg~qv7q.md)

- Role Details: LM5146 100V high\-side MOSFET; 9\.8mohm max at 10V, 95nC Qg; thermal validation required\.
- LCSC Part Number: C396083
- Manufacturer Name: SINO\-IC\(光宇睿芯\)
- Role: Switching
- Package or Case Code: DFN\-8\_L5\.1\-W5\.7\-P1\.27\-LS6\.1\-BL
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_2409302230\_SINO\-IC\-SED10070GG\_C396083\.pdf
- JLCPCB Part Class: Extended Part
- Part Type: MOSFETs
- Product Info Url: https://lcsc\.com/product\-detail/New\-Arrivals\_SINO\-IC\-SED10070GG\_C396083\.html
- Manufacturer Part Number: SED10070GG

**Pins:**
- D [pin 8]
- D [pin 5]
- D [pin 9]
- D [pin 7]
- D [pin 6]
- G [pin 4]
- S [pin 1]
- S [pin 2]
- S [pin 3]

### Q2 — [SED10070GG](https://flux.ai/lcsc/sed10070gg~qv7q.md)

- LCSC Part Number: C396083
- Manufacturer Name: SINO\-IC\(光宇睿芯\)
- Role Details: LM5146 100V low\-side MOSFET and RDS\(on\) current\-sense element; 9\.8mohm max at 10V, 95nC Qg\.
- Package or Case Code: DFN\-8\_L5\.1\-W5\.7\-P1\.27\-LS6\.1\-BL
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_2409302230\_SINO\-IC\-SED10070GG\_C396083\.pdf
- JLCPCB Part Class: Extended Part
- Part Type: MOSFETs
- Role: Switching
- Product Info Url: https://lcsc\.com/product\-detail/New\-Arrivals\_SINO\-IC\-SED10070GG\_C396083\.html
- Manufacturer Part Number: SED10070GG

**Pins:**
- D [pin 8]
- D [pin 5]
- D [pin 9]
- D [pin 7]
- D [pin 6]
- G [pin 4]
- S [pin 1]
- S [pin 2]
- S [pin 3]

### U1 — [DRV8873HPWPR](https://flux.ai/lcsc/drv8873hpwpr~4yks.md)

- Manufacturer Name: Texas Instruments
- Manufacturer Part Number: DRV8873HPWPRQ1
- Role Details: Automotive DRV8873\-Q1 H\-bridge driver for bipolar DCC output stage; pin/package\-compatible HTSSOP\-24 PowerPAD variant, requires thermal validation\.
- Role: H\-Bridge Driver
- Product Info Url: https://jlcpcb\.com/partdetail/TexasInstruments\-DRV8873HPWPRQ1/C2150479
- JLCPCB Part Class: Extended Part
- Part Type: Motor Driver ICs
- Package or Case Code: HTSSOP\-24\_L7\.8\-W4\.4\-P0\.65\-LS6\.4\-BL\-EP5\.2
- LCSC Part Number: C2150479
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/drv8873\-q1\.pdf

**Pins:**
- CPH [pin 22]
- CPL [pin 23]
- DISABLE [pin 9]
- DVDD [pin 1]
- EN/IN1 [pin 7]
- EP [pin 25]
- GND [pin 24]
- IPROPI1 [pin 10]
- IPROPI2 [pin 12]
- MODE [pin 3]
- nFAULT [pin 2]
- nITRIP [pin 5]
- nOL [pin 6]
- nSLEEP [pin 11]
- OUT1 [pin 18]
- OUT1 [pin 19]
- OUT2 [pin 15]
- OUT2 [pin 14]
- PH/IN2 [pin 8]
- SR [pin 4]
- SRC [pin 16]
- SRC [pin 17]
- VCP [pin 21]
- VM [pin 20]
- VM [pin 13]

### U2 — [74LVC1G04SE\-7](https://flux.ai/lcsc/74lvc1g04se-7~j36l.md)

- Manufacturer Part Number: 74LVC1G04SE\-7
- Role Details: Generates DCC\_SIGN from ESP32 DCC\_SIG for IN2\.
- LCSC Part Number: C264081
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_Diodes\-Incorporated\-74LVC1G04SE\-7\_C264081\.pdf
- Package or Case Code: SOT\-353\_L2\.2\-W1\.4\-P0\.65\-LS2\.4\-BR
- JLCPCB Part Class: Extended Part
- Part Type: Gates
- Manufacturer Name: DIODES\(美台\)
- Role: Logic Inverter
- Product Info Url: https://lcsc\.com/product\-detail/Others\_Diodes\-Incorporated\_74LVC1G04SE\-7\_Diodes\-Incorporated\-74LVC1G04SE\-7\_C264081\.html

**Pins:**
- A [pin 2]
- GND [pin 3]
- NC [pin 1]
- VCC [pin 5]
- Y [pin 4]

### U3 — [LMR36015BRNXR](https://flux.ai/lcsc/lmr36015brnxr~7d6u.md)

- Manufacturer Part Number: LMR36015BRNXR
- Part Type: DC\-DC Converters
- JLCPCB Part Class: Extended Part
- Manufacturer Name: Texas Instruments
- Functional Group: 3\.3V Buck Regulator
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/lmr36015\.pdf
- Role Details: VBUS to 3\.3V synchronous buck, 1\.5A, 1MHz; TI LMR36015BRNXR / LCSC C1850340
- Role: Power Conversion
- LCSC Part Number: C1850340
- Package or Case Code: VQFN\-12\_L3\.0\-W2\.0\-P0\.65\-BL\_TI\_RNX

**Pins:**
- AGND [pin 6]
- BOOT [pin 4]
- EN [pin 9]
- FB [pin 7]
- NC [pin 3]
- PG [pin 8]
- PGND [pin 11]
- PGND [pin 1]
- SW [pin 12]
- VCC [pin 5]
- VIN [pin 2]
- VIN [pin 10]

### U4 — [ESP32\-WROOM\-32UE](https://flux.ai/jecstronic/esp32-wroom-32ue~ob.md)

- Manufacturer Name: Espressif Systems
- Part Type: Module
- Role: MCU / WiFi Module
- Datasheet URL: https://www\.espressif\.com/sites/default/files/documentation/esp32\-wroom\-32e\_esp32\-wroom\-32ue\_datasheet\_en\.pdf
- Product Info Url: https://www\.lcsc\.com/product\-detail/C701346\.html
- Role Details: WiThrottle client and DCC waveform generator; replaces bare Espressif chip for assembly compatibility\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: ESP32\-WROOM\-32UE\-N16
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C701346

**Pins:**
- 3V3 [pin 2]
- EN [pin 3]
- GND [pin 39\_1]
- GND [pin 39\_15]
- GND [pin 39\_10]
- GND [pin 39\_6]
- GND [pin 39\_7]
- GND [pin 39\_17]
- GND [pin 39\_14]
- GND [pin 39\_13]
- GND [pin 39\_11]
- GND [pin 39\_19]
- GND [pin 1]
- GND [pin 39\_9]
- GND [pin 15]
- GND [pin 39\_8]
- GND [pin 39\_21]
- GND [pin 39\_5]
- GND [pin 38]
- GND [pin 39\_18]
- GND [pin 39\_4]
- GND [pin 39\_2]
- GND [pin 39\_12]
- GND [pin 39\_16]
- GND [pin 39\_20]
- GND [pin 39\_3]
- IO0 [pin 25]
- IO12 [pin 14]
- IO13 [pin 16]
- IO14 [pin 13]
- IO15 [pin 23]
- IO16 [pin 27]
- IO17 [pin 28]
- IO18 [pin 30]
- IO19 [pin 31]
- IO2 [pin 24]
- IO21 [pin 33]
- IO22 [pin 36]
- IO23 [pin 37]
- IO25 [pin 10]
- IO26 [pin 11]
- IO27 [pin 12]
- IO32 [pin 8]
- IO33 [pin 9]
- IO34 [pin 6]
- IO35 [pin 7]
- IO4 [pin 26]
- IO5 [pin 29]
- NC [pin 21]
- NC [pin 20]
- NC [pin 17]
- NC [pin 22]
- NC [pin 19]
- NC [pin 18]
- NC1 [pin 32]
- RXD0 [pin 34]
- SENSOR\_VN [pin 5]
- SENSOR\_VP [pin 4]
- TXD0 [pin 35]

### U5 — [LM5146QRGYRQ1](https://flux.ai/lcsc/lm5146qrgyrq1~ubwf.md)

- JLCPCB Part Class: Extended Part
- Functional Group: 16V Buck
- Part Type: DC\-DC Controllers
- Manufacturer Name: TI\(德州仪器\)
- Manufacturer Part Number: LM5146QRGYRQ1
- LCSC Part Number: C1850329
- Package or Case Code: VQFN\-20\_L4\.5\-W3\.5\-P0\.50\-BL\-EP\-1
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/lm5146\-q1\.pdf?HQS=dis\-dk\-null\-digikeymode\-dsf\-pf\-null\-wwe&ts=1780585094516&ref\_url=https%253A%252F%252Fwww\.ti\.com%252Fgeneral%252Fdocs%252Fsuppproductinfo\.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww\.ti\.com%252Flit%252Fgpn%252Flm5146\-q1
- Symbol Style: parametric\-v1
- Role: Power Conversion
- Role Details: LM5146\-Q1 synchronous buck controller, 16\.8V nominal at up to 5A from rectified VBUS, 400kHz\. Regulation requires VBUS trough above 16\.8V plus conversion headroom\.

**Pins:**
- AGND [pin 6]
- BST [pin 17]
- COMP [pin 4]
- EN/UVLO [pin 1]
- EP [pin 15]
- FB [pin 5]
- GND [pin 21]
- HO [pin 18]
- ILIM [pin 11]
- LO [pin 13]
- NC [pin 9]
- NC [pin 16]
- PGND [pin 12]
- PGOOD [pin 10]
- RT [pin 2]
- SS/TRK [pin 3]
- SW [pin 19]
- SYNCIN [pin 8]
- SYNCOUT [pin 7]
- VCC [pin 14]
- VIN [pin 20]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/wcom939/tmcc\-wifi\-dcc\-5a\-module\~jx](https://flux.ai/wcom939/tmcc-wifi-dcc-5a-module~jx).*

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*Generated from [https://flux\.ai/wcom939/tmcc\-wifi\-dcc\-5a\-module\~jx](https://flux.ai/wcom939/tmcc-wifi-dcc-5a-module~jx)*