# SAI 5V Dual\-Domain Power Module

## Description

Production\-intent regulated 5 V power\-entry module with reverse\-polarity protection, fail\-safe dry\-contact shutdown, and independently fused logic and motor domains using strict single\-point star grounding\.

## Project Details

- **Owner:** quaff
- **Created:** 8/15/2026
- **Last Updated:** 8/15/2026
- **Visibility:** Public

## Key Components

### ENT\_C1 — [Generic Capacitor](https://flux.ai/jharwinbarrozo/generic-capacitor~1d.md)

- Capacitor Type: Ceramic
- Voltage Rating: 25V
- Package: SMD\_0603\_1608Metric
- Role Details: Gate\-source capacitor; ENT\_R1\*C1 nominal 1 ms; actual switching timing requires bench measurement
- Role: Timing
- Functional Group: PWR\_ENTRY
- Part Type: Non\-Polarized Capacitor
- Capacitance: 10nF

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### ENT\_C2 — [Generic Capacitor](https://flux.ai/jharwinbarrozo/generic-capacitor~1d.md)

- Capacitor Type: Ceramic
- Voltage Rating: 25V
- Package: SMD\_1210\_3225Metric
- Role Details: Local VIN\_5V entry energy storage; account for MLCC DC\-bias derating
- Role: Bulk
- Part Type: Non\-Polarized Capacitor
- Capacitance: 10uF
- Functional Group: PWR\_ENTRY

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### ENT\_C3 — [Generic Capacitor](https://flux.ai/jharwinbarrozo/generic-capacitor~1d.md)

- Functional Group: PWR\_ENTRY
- Voltage Rating: 25V
- Package: SMD\_0603\_1608Metric
- Role: Decoupling
- Capacitor Type: Ceramic
- Part Type: Non\-Polarized Capacitor
- Capacitance: 100nF
- Role Details: VIN\_5V entry high\-frequency bypass

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### ENT\_J1 — [2EDGVC\-5\.08\-04P\-14\-100A\(H\)](https://flux.ai/lcsc/2edgvc-5p08-04p-14-100ah~r7yf.md)

- Part Type: Pluggable System Terminal Block
- Manufacturer Part Number: 2EDGVC\-5\.08\-04P\-14\-100A\(H\)
- Manufacturer Name: DEGSON\(高正/高松\)
- Functional Group: PWR\_ENTRY
- Role Details: Regulated 5 V input; parallel contacts require current\-rating validation
- LCSC Part Number: C2758106
- Role: Power Conversion
- JLCPCB Part Class: Extended Part
- Package or Case Code: CONN\-TH\_2EDGVC\-5\.08\-04P\-14\-100A\-H

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### ENT\_Q1 — [AON6403](https://flux.ai/silicon-yard/aon6403.md)

- Manufacturer Name: Alpha & Omega Semiconductors
- Symbol Style: parametric\-v1
- Role: Reverse Polarity Protection
- Manufacturer Part Number: AON6403
- Functional Group: PWR\_ENTRY
- Datasheet URL: http://www\.aosmd\.com/pdfs/datasheet/AON6403\.pdf
- Part Type: Transistors
- Role Details: AON6403 entry stage; 12 A path requires thermal/copper validation

**Pins:**
- D\_1 [pin 5]
- D\_2 [pin 6]
- D\_3 [pin 7]
- D\_4 [pin 8]
- G [pin 4]
- S\_1 [pin 1]
- S\_2 [pin 2]
- S\_3 [pin 3]

### ENT\_Q2 — [AON6403](https://flux.ai/silicon-yard/aon6403.md)

- Manufacturer Name: Alpha & Omega Semiconductors
- Symbol Style: parametric\-v1
- Functional Group: PWR\_ENTRY
- Manufacturer Part Number: AON6403
- Role Details: Open RUN contact OFF; closed dry contact to GND\_IN enables output
- Role: Switching
- Datasheet URL: http://www\.aosmd\.com/pdfs/datasheet/AON6403\.pdf
- Part Type: Transistors

**Pins:**
- D\_1 [pin 5]
- D\_2 [pin 6]
- D\_3 [pin 7]
- D\_4 [pin 8]
- G [pin 4]
- S\_1 [pin 1]
- S\_2 [pin 2]
- S\_3 [pin 3]

### ENT\_R1 — [Generic Resistor](https://flux.ai/jharwinbarrozo/generic-resistor~3e.md)

- Part Type: Resistor
- Role Details: Forces ENT\_Q2 OFF when RUN contact is open; forms 1 ms nominal R\*C with ENT\_C1
- Functional Group: PWR\_ENTRY
- Tolerance: 1%
- Resistance: 100kΩ
- Package: SMD\_0603\_1608Metric
- Role: Pull Up / Down

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### ENT\_R2 — [Generic Resistor](https://flux.ai/jharwinbarrozo/generic-resistor~3e.md)

- Part Type: Resistor
- Functional Group: PWR\_ENTRY
- Role: Current Limiting
- Role Details: Limits gate/contact current from RUN\_SW\_GATE dry contact
- Tolerance: 1%
- Resistance: 1kΩ
- Package: SMD\_0603\_1608Metric

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### ENT\_R3 — [Generic Resistor](https://flux.ai/jharwinbarrozo/generic-resistor~3e.md)

- Part Type: Resistor
- Role Details: Only permitted GND\_IN\-to\-LOGIC\_GND connection
- Functional Group: PWR\_ENTRY
- Tolerance: 1%
- Resistance: 0Ω
- Package: SMD\_1206\_3216Metric
- Role: Isolation

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### ENT\_R4 — [Generic Resistor](https://flux.ai/jharwinbarrozo/generic-resistor~3e.md)

- Part Type: Resistor
- Role Details: Only permitted GND\_IN\-to\-MOTOR\_GND connection
- Functional Group: PWR\_ENTRY
- Tolerance: 1%
- Role: Isolation
- Resistance: 0Ω
- Package: SMD\_1206\_3216Metric

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### LOG\_C1 — [Generic Capacitor](https://flux.ai/jharwinbarrozo/generic-capacitor~1d.md)

- Voltage Rating: 16V
- Capacitor Type: Aluminum Electrolytic
- Package: CP\_Radial\_D12\.5mm\_P5\.00mm
- Role: Bulk
- Functional Group: LOGIC\_DIST
- Role Details: 2200uF 16V low\-ESR 105C radial electrolytic; exact D12\.5mm/P5\.00mm footprint; P1 positive
- Part Type: Polarized Capacitor
- Capacitance: 2200uF

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### LOG\_C2 — [Generic Capacitor](https://flux.ai/jharwinbarrozo/generic-capacitor~1d.md)

- Role Details: LOGIC\_5V rail high\-frequency bypass
- Voltage Rating: 16V
- Functional Group: LOGIC\_DIST
- Package: SMD\_0603\_1608Metric
- Role: Decoupling
- Capacitor Type: Ceramic
- Part Type: Non\-Polarized Capacitor
- Capacitance: 100nF

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### LOG\_F1 — [BSMD2920\-400\-16V](https://flux.ai/lcsc/bsmd2920-400-16v~k27.md)

- Product Info Url: https://lcsc\.com/product\-detail/PTC\-Resettable\-Fuses\_BHFUSE\-BSMD2920\-400\-16V\_C910845\.html
- Manufacturer Name: BHFUSE\(佰宏\)
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010300\_BHFUSE\-BSMD2920\-400\-16V\_C910845\.pdf
- Role: Protection
- Functional Group: LOGIC\_DIST
- Package or Case Code: F2920
- JLCPCB Part Class: Extended Part
- Role Details: Logic branch 4 A hold, 8 A trip at 25 C; verified from datasheet
- Manufacturer Part Number: BSMD2920\-400\-16V
- Part Type: Resettable Fuses
- LCSC Part Number: C910845

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

### LOG\_J1 — [2EDGVC\-5\.08\-04P\-14\-100A\(H\)](https://flux.ai/lcsc/2edgvc-5p08-04p-14-100ah~r7yf.md)

- Part Type: Pluggable System Terminal Block
- Manufacturer Part Number: 2EDGVC\-5\.08\-04P\-14\-100A\(H\)
- Role: Power Conversion
- Manufacturer Name: DEGSON\(高正/高松\)
- LCSC Part Number: C2758106
- JLCPCB Part Class: Extended Part
- Package or Case Code: CONN\-TH\_2EDGVC\-5\.08\-04P\-14\-100A\-H
- Functional Group: LOGIC\_DIST
- Role Details: LOGIC\_5V and LOGIC\_GND output; parallel contacts require current\-rating validation

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### LOG\_R1 — [Generic Resistor](https://flux.ai/jharwinbarrozo/generic-resistor~3e.md)

- Part Type: Resistor
- Functional Group: LOGIC\_DIST
- Role Details: Unconnected because exact KT\-0603G green LED is unavailable
- Role: Current Limiting
- Tolerance: 1%
- Resistance: 470Ω
- Package: SMD\_0603\_1608Metric

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### MOT\_C2 — [Generic Capacitor](https://flux.ai/jharwinbarrozo/generic-capacitor~1d.md)

- Role Details: MOTOR\_V high\-frequency bypass
- Capacitor Type: Ceramic
- Functional Group: MOTOR\_DIST
- Voltage Rating: 16V
- Package: SMD\_0603\_1608Metric
- Role: Decoupling
- Part Type: Non\-Polarized Capacitor
- Capacitance: 100nF

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### MOT\_C3 — [Generic Capacitor](https://flux.ai/jharwinbarrozo/generic-capacitor~1d.md)

- Voltage Rating: 16V
- Role: Bulk
- Package: SMD\_1210\_3225Metric
- Functional Group: MOTOR\_DIST
- Capacitor Type: Ceramic
- Part Type: Non\-Polarized Capacitor
- Capacitance: 10uF
- Role Details: MOTOR\_V local ceramic energy storage; account for DC\-bias derating

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### MOT\_J1 — [2EDGVC\-5\.08\-04P\-14\-100A\(H\)](https://flux.ai/lcsc/2edgvc-5p08-04p-14-100ah~r7yf.md)

- Functional Group: MOTOR\_DIST
- Part Type: Pluggable System Terminal Block
- Role Details: MOTOR\_V and MOTOR\_GND output; parallel contacts require current\-rating validation
- Manufacturer Part Number: 2EDGVC\-5\.08\-04P\-14\-100A\(H\)
- Manufacturer Name: DEGSON\(高正/高松\)
- LCSC Part Number: C2758106
- JLCPCB Part Class: Extended Part
- Role: Power Conversion
- Package or Case Code: CONN\-TH\_2EDGVC\-5\.08\-04P\-14\-100A\-H

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### MOT\_R1 — [Generic Resistor](https://flux.ai/jharwinbarrozo/generic-resistor~3e.md)

- Part Type: Resistor
- Role Details: Unconnected because exact HSMA\-C170\-T0000 amber LED is unavailable
- Functional Group: MOTOR\_DIST
- Tolerance: 1%
- Role: Current Limiting
- Resistance: 680Ω
- Package: SMD\_0603\_1608Metric

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/quaff/sai\-5v\-dual\-domain\-power\-module\~e1](https://flux.ai/quaff/sai-5v-dual-domain-power-module~e1).*

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*Generated from [https://flux\.ai/quaff/sai\-5v\-dual\-domain\-power\-module\~e1](https://flux.ai/quaff/sai-5v-dual-domain-power-module~e1)*