6 layers111.8 × 111.8 mm Rt ihu, the printed circuit board in 3D

Rt ihu

Radiation Tolerant IHU (Flight Computer)

Size: 111.8 × 111.8 mm
Copper layers: 6
Thickness: 1.56 mm
Parts: 524
Nets: 485
Pads: 1,809
Tracks, vias: 5,446, 1,495
Pours: 120
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 6 Nov 2024
Updated: 15 Jan 2025

Overview

Rt ihu is an open-source printed circuit board by zmetzing, from the zmetzing/rt-ihu repository on GitHub, published under the BSD-2-Clause licence. It is a 6-layer board of 111.8 × 111.8 mm with 524 parts on 485 nets, routed with 5,446 tracks and 1,495 vias.

It is built around the MMZ09312BT1, ADP-2-1W+ and MAX31726MTA+, with the MR25H40DF, SN74CBTLV3245APW and FPF2004 among its other parts. Its parts include 154 capacitors, 140 resistors, 39 inductors, 37 ICs and 18 diodes.

Main components

README

This repo holds the physical design files for the:

text

 Radiation Tolerant Internal Housekeeping Unit (RT-IHU)

The RT-IHU was conceived as a successor to the Fox-series IHU flight computer. It aims tp increase reliability in higher Earth orbits where a harsher radiation environment might cause early failure of the "legacy" IHU design.

The directory hierarchy is as follows:

pcb/ Schematic and layout files for board kicad_lib Symbol and footprint libraries for KiCAD docs Design documentation for the supervisor

Z. Metzinger 14-Jan-2025

Credits

Initial design/schematic/layout (v1.0, v1.1, v1.2) by Z. Metzinger (N0ZGO) Design review and input from J. Brandenburg (KF5IDY), B. Davis, B. Fisher (WB1FJ), M. McCann (KB2GHZ), B. Reed (NX5R), E. Skoog (K1TVV), J. Trewitt (KF5COQ), and all the team members of AMSAT GOLF -- present and former. KiCAD 7.x conversion and v1.2.1 layout by C. Castillo (KJ7ILB)

Release Notes

v1.2.1 U37 and U39 are wired incorrectly and require blue-wire fixes U38 is DNI, but a blue wire must be installed between pins 1 and 5 on PCB

Parts

524

Qty	Value	Footprint	References
47	100n	Capacitors_SMD:C_0603	C1, C2, C3, C4, C42, C43, C104, C105, C115, C116, C117, C118, C119, C120, C121, C122 +31
32	100R	Resistors_SMD:R_0402	R103, R104, R105, R106, R107, R108, R109, R119, R120, R121, R122, R123, R124, R125, R126, R127 +16
32	1M	Resistors_SMD:R_0402	R100, R101, R102, R110, R111, R112, R113, R114, R115, R116, R117, R118, R128, R129, R130, R131 +16
32	470p	Capacitors_SMD:C_0402	C126, C127, C128, C129, C130, C131, C132, C133, C134, C135, C136, C137, C138, C139, C140, C141 +16
16	DNI	Capacitors_SMD:C_0603	C13, C17, C19, C20, C26, C68, C72, C74, C75, C81, C112, C113, C114, C123, C124, C125
14	~	amsat_misc:RF_SHIELD_PAD	SH1, SH2, SH3, SH4, SH5, SH6, SH7, SH8, SH9, SH9, SH10, SH10, SH12, SH12
13	0R	Resistors_SMD:R_0603	R6, R7, R13, R28, R34, R35, R40, R41, R42, R43, R49, R54, R55
10	10p	Capacitors_SMD:C_0603	C21, C27, C28, C76, C82, C83, C98, C99, C100, C101
10	1k	Resistors_SMD:R_0603	R60, R61, R62, R63, R64, R65, R66, R67, R76, R77
10	1u	Capacitors_SMD:C_0603	C14, C18, C40, C41, C69, C73, C102, C103, C109, C111
10	3k3	Resistors_SMD:R_0603	R1, R2, R3, R20, R22, R23, R24, R37, R39, R68
8	10k	Resistors_SMD:R_0603	R38, R44, R45, R52, R53, R56, R57, R73
8	8k2	Resistors_SMD:R_0603	R11, R12, R29, R31, R69, R70, R74, R75
8	D	Diodes_SMD:D_SOD-123	D11, D12, D13, D14, D15, D16, D17, D18
6	10n	Capacitors_SMD:C_0603	C29, C30, C31, C84, C85, C86
6	270	Resistors_SMD:R_0603	R15, R16, R17, R25, R26, R27
6	SN74CBTLV3245A	amsat_ti:RGY_R-PVQFN-N20	U13, U14, U15, U16, U19, U20
5	4u7	Capacitors_SMD:C_0603	C25, C80, C89, C90, C96
4	0R	amsat_murata:L_0603	L7, L25, L38, L39
4	120n	amsat_murata:L_0603	L12, L13, L30, L31
4	12n	amsat_murata:L_0603	L6, L8, L24, L26
4	12p	Capacitors_SMD:C_0603	C23, C24, C78, C79
4	150n	amsat_murata:L_0603	L14, L15, L32, L33
4	16M	amsat_abracon:Crystal_SMD_ABM9	Y1, Y2, Y3, Y4
4	4k7	Resistors_SMD:R_0603	R50, R51, R58, R59
4	4p3	Capacitors_SMD:C_0603	C10, C12, C65, C67
4	68n	amsat_murata:L_0603	L10, L11, L28, L29
4	CUBESAT_MOUNT_HOLE	amsat_misc:CUBESAT_MOUNT_HOLE	H1, H2, H3, H4
4	FPF2004	Package_TO_SOT_SMD:SOT-353_SC-70-5	U29, U30, U37, U39
4	MAX14930	amsat_maxim:QSOP-16_E16MS_1F	U41, U42, U43, U44
4	RED	LEDs:LED_0603	D1, D4, D8, D9
3			, ,
3	15u	Capacitors_SMD:C_0603	C87, C88, C95
3	3u3	amsat_murata:L_0603	L35, L36, L37
3	49k9 1%	Resistors_SMD:R_0603	R46, R71, R72
3	MAX4995	TO_SOT_Packages_SMD:SOT-23-6	U6, U7, U35
3	PEM_SMTSO_256_2ET	amsat_misc:PEM_SMTSO_256_2ET	H5, H6, H7
2	100n	amsat_murata:L_0603	L1, L19
2	100p	Capacitors_SMD:C_0603	C15, C70
2	10u	Capacitors_SMD:C_0603	C36, C37
2	18n	amsat_murata:L_0603	L4, L22
2	1k5	Resistors_SMD:R_0603	R5, R33
2	1n2	amsat_murata:L_0603	L5, L23
2	22n	Capacitors_SMD:C_0603	C32, C33
2	24k	Resistors_SMD:R_0603	R14, R30
2	270R	Resistors_SMD:R_0603	R10, R36
2	2u2	Capacitors_SMD:C_0603	C34, C35
2	330R	Resistors_SMD:R_0603	R4, R32
2	3n9	amsat_murata:L_0603	L9, L27
2	3p9	Capacitors_SMD:C_0603	C22, C77
2	42k2 1%	Resistors_SMD:R_0603	R19, R47
2	43n	amsat_murata:L_0603	L2, L20
2	470n	Capacitors_SMD:C_0603	C106, C107
2	470p	Capacitors_SMD:C_0603	C16, C71
2	4n7	amsat_murata:L_0603	L3, L21
2	5p6	Capacitors_SMD:C_0603	C11, C66
2	91n	amsat_murata:L_0603	L16, L34
2	ADP-2-1W+	amsat_minicircuits:ADP-2-1W+	T1, T2
2	AX5043	amsat_onsemi:QFN28	U3, U26
2	DS28E83	amsat_maxim:TDFN_T633_2	U18, U32
2	Disable Watchdog	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal	JP1, JP2
2	GRN	LEDs:LED_0603	D3, D6
2	LT1963A-3.3	Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm	U27, U31
2	MAX3051	amsat_maxim:MAX-SOIC-8	U8, U22
2	MAX31726	amsat_maxim:TDFN_T833_2	U9, U23
2	MAX77504	amsat_maxim:FC2QFN_F122A2F_2	U4, U5
2	MMSD4148T3G	Diodes_SMD:D_SOD-123	D7, D10
2	MMZ09312BT1	amsat_nxp:QFN12	U2, U25
2	MR25H40	amsat_everspin:MR2xH40_DFN_SmallFlag	U10, U24
2	SMA	amsat_misc:MMCX	P1, P2
2	STWD100NYWY3F	TO_SOT_Packages_SMD:SOT-23-5	U33, U36
2	TMS570LS0914PGE	amsat_ti:TQFP-144_20x20mm_Pitch0.5mm	U1, U21
2	YEL	LEDs:LED_0603	D2, D5
1	115k 1%	Resistors_SMD:R_0603	R8
1	11k1 1%	Resistors_SMD:R_0603	R48
1	143k 1%	Resistors_SMD:R_0603	R18
1	15p	Capacitors_SMD:C_0603	C108
1	1u	Inductors_SMD:L_1210	L18
1	1u5	Inductors_SMD:L_1210	L17
1	2.87k 1%	Resistors_SMD:R_0603	R9

The 422 most common of 524 parts.

Questions

How big is the Rt ihu PCB?

It measures 111.8 × 111.8 mm and has 6 copper layers, 1.56 mm thick.

What parts does the Rt ihu use?

524 parts, built around the MMZ09312BT1, ADP-2-1W+, MAX31726MTA+ and MR25H40DF. 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 Rt ihu KiCad files?

From the zmetzing/rt-ihu repository on GitHub, at the commit this page was made from: the board is pcb/rtihu.kicad_pcb and its schematic pcb/arbiter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Rt ihu design in my own project?

Its repository publishes it under the BSD-2-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Project files

Show this board on your page

A live frame, for any web page

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A picture

<img src="https://pcbkit.io/embed/boards/zmetzing-rt-ihu.jpg" alt="Rt ihu" width="1200" height="900">

A picture that opens the board, for a README

[![Rt ihu](https://pcbkit.io/embed/boards/zmetzing-rt-ihu.jpg?size=s)](https://pcbkit.io/boards/zmetzing-rt-ihu)

Source

Repository: zmetzing/rt-ihu
Board file: pcb/rtihu.kicad_pcb
Commit: 8a29f87
Licence: BSD-2-Clause

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