4 layers164 × 118 mm Hellen121vag, the printed circuit board in 3D

Hellen121vag

A member of Hellen ECU family for rusEFI firmware.

Size: 164 × 118 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 129
Nets: 298
Pads: 876
Tracks, vias: 2,171, 281
Pours: 12
Routed: Yes
KiCad: KiCad 6 (file 20211014)
Created: 15 Jan 2021
Updated: 9 Sep 2025

Overview

Hellen121vag is an open-source printed circuit board by rusefi, from the rusefi/hellen121vag repository on GitHub. It is a 4-layer board of 164 × 118 mm with 129 parts on 298 nets, routed with 2,171 tracks and 281 vias.

It is built around the L6205PD, LPS25HB and 1N4148WS, with the B5819W among its other parts. Its parts include 46 connectors, 21 resistors, 19 capacitors, 14 diodes and 5 ICs.

Main components

README

README.md

A member of Hellen ECU family for rusEFI firmware.

User Documentation

ME 7.5

2025 status: older, single-side assembly revisions are known to function OK but a full refresh is in order:

need to use better ETB driver
need to use more reasonable injector drivers
etc?

Project files

Show this board on your page

https://pcbkit.io/boards/rusefi/hellen121vag

The board's own page, for a message or a post.

Source

Repository: rusefi/hellen121vag
Board file: hellen121vag.kicad_pcb
Commit: 386bc8e
Licence: Not stated

Parts

129

Qty	Value	Footprint	References
36	Pad	hellen-one-common:PAD-TH	P2, P3, P4, P10, P11, P12, P13, P14, P15, P16, P17, P20, P28, P40, P41, P43 +20
9	Jumper-Pad-Pad	hellen-one-common:PAD-0805-PAD	R2, R3, R4, R8, R9, R10, R11, R12, R13
8	10u	Capacitor_SMD:C_0805_2012Metric	C7, C8, C9, C10, C11, C12, C13, C14
5	100n	hellen-one-common:C0603	C1, C2, C6, C15, C16
5	1N4148WS	hellen-one-common:SOD-323	D1, D2, D3, D5, D9
5	B5819W	Diode_SMD:D_SOD-123	D10, D11, D12, D13, D14
5	Conn_01x01	TestPoint:TestPoint_Pad_D2.0mm	J2, J3, J4, J5, J6
4	LED-GREEN-0805	hellen-one-common:LED-0805	D4, D6, D7, D8
4	PROTO_AREA	hellen-one-common:PROTO_AREA	G1, G2, G3, G5
2	1u	hellen-one-common:C0603	C18, C19
2	2.7k	hellen-one-common:R0603	R6, R7
2	4.7k	hellen-one-common:R0603	R18, R19
2	5.1k	hellen-one-common:R0603	R16, R17
2	Button_SPST	hellen-one-common:SMD-2_2.9x3.9x1.7	S1, S2
2	Fuse-Pad-Pad	hellen-one-common:PAD-1206-PAD	F1, F2
2	LOGO	hellen-one-common:LOGO	G***, G6
2	Module-can-0.1	hellen-one-can-0.1:can	M1, M10
1	0	hellen-one-common:R0603	R23
1	1.6k	hellen-one-common:R0603	R20
1	100	hellen-one-common:R0603	R1
1	100k	hellen-one-common:R0603	R5
1	10k	hellen-one-common:R0603	R22
1	10n	hellen-one-common:C0603	C4
1	10u	hellen-one-common:C0603	C17
1	220n	hellen-one-common:C0603	C3
1	368255-2	hellen121vag:368255-2	P1
1	5.6n	hellen-one-common:C0603	C5
1	750	hellen-one-common:R0603	R21
1	AudioJack_THR	hellen-one-common:Jack_3.5mm_PJ-3250-5A	J10
1	BATTERY_CR2032	Battery:BatteryHolder_Keystone_1060_1x2032	BT1
1	Conn_01x06	Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical	J8
1	Conn_01x08	Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical	J7
1	DISCLAIMER	rusefi_lib:Off_Road_Disclaimer	G4
1	L6205PD	hellen-one-common:SO20POWER	U1
1	LOGO	rusefi_lib:LOGO	G7
1	LPS25HB	Package_LGA:ST_HLGA-10_2.5x2.5mm_P0.6mm_LayoutBorder3x2y	U2
1	MCP6002-xSN	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U3
1	Module-ign8-0.2	hellen-one-ign8-0.2:ign8	M7
1	Module-input-0.1	hellen-one-input-0.1:input	M4
1	Module-knock-0.1	hellen-one-knock-0.1:knock	M5
1	Module-mcu-0.7	hellen-one-mcu-0.7:mcu	M3
1	Module-output-0.3	hellen-one-output-0.3:output	M6
1	Module-power12-0.2	hellen-one-power12-0.2:power12	M8
1	Module-power5-0.2	hellen-one-power5-0.2:power5	M2
1	Module-vr-discrete-0.1	hellen-one-vr-discrete-0.1:vr-discrete	M11
1	Module-wbo-0.3	hellen-one-wbo-0.3:wbo	M9
1	TLS115_SOIC	kicad6-libraries:PG-DSO-8-43_VIA	U4
1	TLS115_SON	Package_SON:HVSON-8-1EP_3x3mm_P0.65mm_EP1.6x2.4mm	U5
1	USB_B_Mini	hellen-one-common:USB-MINI-B-VERTICAL	J1

Similar boards

4 layers160 × 118 mm
Hellen88bmw
rusefi/hellen88bmw

307 parts2
2 layers154 × 159 mm
Hellen64 NB1
rusefi/hellen-miata-NB1
Issues are tracked publicly at https://github.com/rusefi/hellen-NB1-issues
198 parts1
2 layers96 × 78.3 mm
Yokozunita potencia
OPRobots/Yokozunita
Robot minisumo con PCBs, motores fingertech, plomo fundido y stepUp.
45 parts2GPL-3.0
4 layers58.7 × 27 mm
Minisumo FreeRTOS
Hector93/mini-sumo-pcb

60 parts
4 layers140 × 100 mm
Dc usv
TobleMiner/DC-UPS
A small DC UPS, designed to keep small appliances like consumer network equipment running during power outages
351 parts223CERN-OHL-P-2.0
2 layers267 × 300 mm
Output.Panel R0.5.1 300x300 2layer step1 Modified
rusefi/hw_microRusEfi
microRusEfi board for rusEfi ECU
2,371 parts98
4 layers88 × 30 mm
Oled nametag
TobleMiner/oled-nametag
A ESP32-based OLED nametag
123 parts54CERN-OHL-P-2.0
4 layers100 × 100 mm
Uaefi
rusefi/uaefi
🔴Community support ONLY 🔴 https://www.facebook.com/groups/rusEfi 🔴 Discord🔴 Commercial Support 🔴
171 parts39

Questions

How big is the Hellen121vag PCB?

It measures 164 × 118 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Hellen121vag use?

129 parts, built around the L6205PD, LPS25HB, 1N4148WS and B5819W. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Hellen121vag KiCad files?

From the rusefi/hellen121vag repository on GitHub, at the commit this page was made from: the board is hellen121vag.kicad_pcb and its schematic boards/hellen121vag-a/kicad6/hellen121vag.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Hellen121vag design in my own project?

Its repository states no licence, so its author keeps all rights: ask rusefi before reusing the design.

Overview

Main components

L6205PD

LPS25HB

1N4148WS

B5819W