# EVSE AC interlock V1.0 (3 relay) ## Description EVSE AC Interlock – Omron G5V-1-DC5 Relay Update ## Project Details - **Owner:** emmiford - **Created:** 1/18/2026 - **Last Updated:** 2/11/2026 - **Visibility:** Public - **System Architecture:** ```mermaid flowchart TD U1 --> Q2 U1 --> Q3 Q2 --> SafetyGate Q2 --> EVSEInterrupt Q2 --> K3 Q3 --> SafetyGate Q3 --> EVSEInterrupt Q3 --> K3 SafetyGate --> ContactTerminals EVSEInterrupt --> ContactTerminals K3 --> ContactTerminals ``` - **Domain:** Automotive ## Key Components ### AC Block — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - Manufacturer Name: SEI(Stackpole Electronics Inc.) - Manufacturer Part Number: CF18JA2K70 - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 - LCSC Part Number: C2642943 **Pins:** - 1 [pin 1] - 2 [pin 2] ### AC Block — [G5V-1-DC5](https://www.flux.ai/jecstronic/g5v-1-dc5.md) - Manufacturer Part Number: G5V-1-DC5 - Role Details: EVSE Interrupt SPDT relay coil and contacts - Part Type: Integrated Circuit - Manufacturer Name: Omron Electronics Inc-EMC Div - Package: RELAY-TH - Role: Relay - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-g5v_1.pdf **Pins:** - 1 [pin 1] - 10 [pin 10] - 2 [pin 2] - 5 [pin 5] - 6 [pin 6] - 9 [pin 9] ### AC Block — [40V NPN BJT Transistor](https://www.flux.ai/corynrobinson/40v-npn-bjt-transistor.md) - Datasheet URL: https://www.onsemi.com/pdf/datasheet/pzt3904-d.pdf - Part Type: Transistor - Manufacturer Name: ON Semiconductor - Manufacturer Part Number: 2N3904TFR **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### AC Block — [Diode_THT_P10.16mm_Horizontal](https://www.flux.ai/jecstronic/diodethtp1016mmhorizontal.md) - Part Type: Diode **Pins:** - A - K ### AC On — [40V NPN BJT Transistor](https://www.flux.ai/corynrobinson/40v-npn-bjt-transistor.md) - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/pzt3904-d.pdf - Manufacturer Name: ON Semiconductor - Manufacturer Part Number: 2N3904TFR **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### AC On — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - Manufacturer Name: SEI(Stackpole Electronics Inc.) - Manufacturer Part Number: CF18JA2K70 - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 - LCSC Part Number: C2642943 **Pins:** - 1 [pin 1] - 2 [pin 2] ### After Opto — [Diode_THT_P10.16mm_Horizontal](https://www.flux.ai/jecstronic/diodethtp1016mmhorizontal.md) - Part Type: Diode **Pins:** - A - K ### After Opto — [PC817X1CSP9F](https://www.flux.ai/jecstronic/pc817x1csp9f.md) - Manufacturer Part Number: FOD817C300-ND - Manufacturer Name: SHARP/Socle Technology - Part Type: Transistor - Datasheet URL: http://www.socle-tech.com/doc/IC%20Channel%20Product/Optoelectronic%20Components/Photocoupler/PC817X_CSP9F_ED-%E8%B4%B4%E7%89%87.PDF - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ANODE [pin 1] - CATHODE [pin 2] - COLLECTOR [pin 4] - EMITTER [pin 3] ### Before Opto — [PC817X1CSP9F](https://www.flux.ai/jecstronic/pc817x1csp9f.md) - Manufacturer Part Number: FOD817C300-ND - Manufacturer Name: SHARP/Socle Technology - Part Type: Transistor - Datasheet URL: http://www.socle-tech.com/doc/IC%20Channel%20Product/Optoelectronic%20Components/Photocoupler/PC817X_CSP9F_ED-%E8%B4%B4%E7%89%87.PDF - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ANODE [pin 1] - CATHODE [pin 2] - COLLECTOR [pin 4] - EMITTER [pin 3] ### EVSE Block — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 - LCSC Part Number: C2642943 - Manufacturer Name: SEI(Stackpole Electronics Inc.) - Manufacturer Part Number: CF18JA2K70 **Pins:** - 1 [pin 1] - 2 [pin 2] ### EVSE Block — [40V NPN BJT Transistor](https://www.flux.ai/corynrobinson/40v-npn-bjt-transistor.md) - Datasheet URL: https://www.onsemi.com/pdf/datasheet/pzt3904-d.pdf - Part Type: Transistor - Manufacturer Name: ON Semiconductor - Manufacturer Part Number: 2N3904TFR **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### EVSE In diode — [Diode_THT_P10.16mm_Horizontal](https://www.flux.ai/jecstronic/diodethtp1016mmhorizontal.md) - Part Type: Diode **Pins:** - A - K ### HVAC dioide — [Diode_THT_P10.16mm_Horizontal](https://www.flux.ai/jecstronic/diodethtp1016mmhorizontal.md) - Part Type: Diode **Pins:** - A - K ### Plugged in — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - Manufacturer Name: SEI(Stackpole Electronics Inc.) - Manufacturer Part Number: CF18JA2K70 - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 - LCSC Part Number: C2642943 **Pins:** - 1 [pin 1] - 2 [pin 2] ### Replace with power supply — [Battery Holder Keystone 1076 1xAAA](https://www.flux.ai/eriarervt/battery-holder-keystone-1076-1xaaa.md) **Pins:** - - [pin -] - + [pin +] ### Safety Gate — [G5V-2-DC12](https://www.flux.ai/adrian95/g5v-2-dc12.md) - Manufacturer Name: Omron Electronics Inc-EMC Div - Part Type: Relay - Manufacturer Part Number: G5V-2-DC12 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-g5v_2.pdf **Pins:** - COIL_1 [pin 1] - COIL_2 [pin 16] - COM_1 [pin 4] - COM_2 [pin 13] - NC_1 [pin 6] - NC_2 [pin 11] - NO_1 [pin 8] - NO_2 [pin 9] ### SG — [Diode_THT_P10.16mm_Horizontal](https://www.flux.ai/jecstronic/diodethtp1016mmhorizontal.md) - Part Type: Diode **Pins:** - A - K ### U1 — [ARDUINO_NANO](https://www.flux.ai/jecstronic/arduinonano.md) - Datasheet URL: https://www.snapeda.com/parts/Arduino%20Nano/Arduino/datasheet/ - Manufacturer Name: Texas Instruments Inc. - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ARDUINO_NANO **Pins:** - +5V [pin 27] - 3V3 [pin 17] - A0 [pin 19] - A1 [pin 20] - A2 [pin 21] - A3 [pin 22] - A4 [pin 23] - A5 [pin 24] - A6 [pin 25] - A7 [pin 26] - AREF [pin 18] - COM/GND [pin 4] - COM/GND [pin 29] - D0/RX [pin 2] - D1/TX [pin 1] - D10 [pin 13] - D11/MOSI [pin 14] - D12/MISO [pin 15] - D13/SCK [pin 16] - D2 [pin 5] - D3 [pin 6] - D4 [pin 7] - D5 [pin 8] - D6 [pin 9] - D7 [pin 10] - D8 [pin 11] - D9 [pin 12] - RESET [pin 3] - RESET [pin 28] - VIN [pin 30] ### U10 — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - LCSC Part Number: C2642943 - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 - Manufacturer Part Number: CF18JA2K70 - Manufacturer Name: SEI(Stackpole Electronics Inc.) **Pins:** - 1 [pin 1] - 2 [pin 2] ### U12 — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - Manufacturer Part Number: - Manufacturer Name: SEI(Stackpole Electronics Inc.) - LCSC Part Number: C2642943 - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 **Pins:** - 1 [pin 1] - 2 [pin 2] ### U5 — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - Manufacturer Part Number: CF18JA2K70 - Manufacturer Name: SEI(Stackpole Electronics Inc.) - LCSC Part Number: C2642943 - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 **Pins:** - 1 [pin 1] - 2 [pin 2] ### U6 — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - Manufacturer Name: SEI(Stackpole Electronics Inc.) - Manufacturer Part Number: - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 - LCSC Part Number: C2642943 **Pins:** - 1 [pin 1] - 2 [pin 2] ### U7 — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - LCSC Part Number: C2642943 - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 - Manufacturer Part Number: CF18JA2K70 - Manufacturer Name: SEI(Stackpole Electronics Inc.) **Pins:** - 1 [pin 1] - 2 [pin 2] ### U8 — [CF18JA2K70](https://www.flux.ai/lcsc/cf18ja2k70.md) - Manufacturer Part Number: CF18JA2K70 - Manufacturer Name: SEI(Stackpole Electronics Inc.) - LCSC Part Number: C2642943 - Package or Case Code: RES-TH_BD1.7-L3.3-P7.30-D0.5 **Pins:** - 1 [pin 1] - 2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/emmiford/evse-ac-interlock-v1p0-3-relay](https://www.flux.ai/emmiford/evse-ac-interlock-v1p0-3-relay).* --- *Generated from [https://www.flux.ai/emmiford/evse-ac-interlock-v1p0-3-relay](https://www.flux.ai/emmiford/evse-ac-interlock-v1p0-3-relay)*