Bill of Materials
This is a list of components you need to build the OpenTendo NES. You will need some components from the original NES and have to order more modern components.
From the OEM NES
| Reference | Qty | Part | Description |
|---|---|---|---|
| U5 | 1 | NTSC: RP2C02 PAL: RP2C07 |
PPU |
| U6 | 1 | NTSC: RP2A03 PAL: RP2A07 |
CPU |
| U10 | 1 | 3193A | CIC |
| Q1 | 1 | A937 | Epitaxial planar PNP transistor |
| Q2, Q3 | 2 | C2021 | 3 pin small signal bipolar transistor |
| DA1, DA3 | 2 | DAN601 | 6 pin small signal diode array |
| P2 | 1 | Connector | 48 pin expansion port |
| P6 | 1 | Connector | 5 pin connector for the power/reset breakout board |
Alternatives
| Reference | Qty | Part | Description |
|---|---|---|---|
| U5 | 1 | NTSC: UA6528 [1] PAL: UA6528P |
PPU clone |
| U6 | 1 | NTSC: UA6527 [2] PAL: UA6527P |
CPU clone |
| U10 | 1 | NullCIC[3] | Small board to replace CIC |
| Q1 | 1 | 2SA937[4] | Epitaxial planar PNP transistor |
| Q2, Q3 | 2 | 2SC2021[5] | 3 pin small signal bipolar transistor |
| DA1, DA3 | 2 | DAN601[6] | 6 pin small signal diode array |
| P2 | 2 | PPPC241LFBN-RC[7] | 24 Pins Header Connector 0.100" (2.54mm) Through Hole |
| P8 | 1 | S5B-PH-K-S[8] | JST-PH 5 pin connector 2mm pitch |
Note
[1] While it works as a direct drop-in replacement, it isn't known whether it is compatible with all NES games.
[2] They are known to have different sounding audio due to swapped duty cycles, as such they aren't a 100% identical substitute, they otherwise work though.
[3] NullCIC is optional. Use this if you want to remove the CIC but still have the reset functionality.
[4][5][6] These components are discontinued and difficult to find. If you could find them, we recommend replacing the OEM. If not, the OEM components should still be fine.
[7] If you don't want to use the OEM expansion port, you can replace it with a header pin connector or not put anything at all. OpenTendo should still work without the expansion port.
[8] If you want to change the blue 5 pin connector (
P6) for the power/reset breakout board, the modded OpenTendo have a footprint for a male 5 pin JST-PH 2mm. You will have to replace the connector of the power/reset breakout board with a female JST-PH 5 pin 2mm pitch. You will also have to replace the wire pins to fit the female connector.
What to buy
We recommend using Octopart's BOM tool and import the BOM.csv. This tool makes ordering from multiple Octopart's authorized distributors (Digikey, Mouser, etc.) easier.
Resistors
| Reference | Qty | Part | Description |
|---|---|---|---|
| RA1 | 1 | 4613X-101-103LF | 10k Ohm ±2% 200mW Bussed 12 Resistor Array 13-SIP |
| R1 | 1 | RNF14FTD1M00 | 1M OHM 1% 1/4W |
| R2, R12 | 2 | CF18JT510R | 510 OHM 5% 1/8W |
| R3, R4 | 2 | CF18JT100R | 100 OHM 5% 1/8W |
| R5 | 1 | CF18JT220R | 220 OHM 5% 1/8W |
| R6 | 1 | CF18JT47K0 | 47K OHM 5% 1/8W |
| R7, R9 | 2 | CF18JT20K0 | 20K OHM 5% 1/8W |
| R8 | 1 | CF18JT12K0 | 12K OHM 5% 1/8W |
| R10 | 1 | CF18JT220K | 220K OHM 5% 1/8W |
| R11 | 1 | CF18JT1K20 | 1.2K OHM 5% 1/8W |
| R13 | 1 | CFR-25JB-52-150K | 150K OHM 5% 1/4W |
| R15 | 1 | CF18JT100K | 100K OHM 5% 1/8W |
| R17 | 1 | CF14JT2K20 | 2.2K OHM 5% 1/4W |
| R18, R19 | 2 | CF18JT1K00 | 1K OHM 5% 1/8W |
Capacitors
| Reference | Qty | Part | Description |
|---|---|---|---|
| BC1, BC2 | 2 | K153K10X7RF5UH5 | 0.015 µF 50V Ceramic Capacitor |
| C1 | 1 | ECE-A0JKA101I | 100 µF 6.3 V Electrolytic Capacitor |
| C2, C3, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C22, C24, C26, C32, C38, C39, C40 |
19 | K103K10X7RF5UH5 | 10000 pF 50V Ceramic Capacitor |
| C4 | 1 | K221K15X7RF5TH5 | 220 pF 50V Ceramic Capacitor 5mm |
| C5, C27, C28, C29, C30, C31, C33, C34, C35, C36, C37 |
11 | K331K15X7RF53L2 | 330 pF 50V Ceramic Capacitor |
| C8, C46 | 2 | K104K15X7RF5UH5 | 0.1 µF 50V Ceramic Capacitor |
| C9 | 1 | ECA-1HHG2R2I | 2.2 µF 50 V Electrolytic Capacitor |
| C20, C43, C45 | 3 | K560J15C0GF5TL2 | 56 pF 50V Ceramic Capacitor |
| C21, C44 | 2 | K221K15X7RF5TL2 | 220 pF 50V Ceramic Capacitor 2.5mm |
| C23 | 1 | UVR2A010MDD1TD | 1 µF 100 V Electrolytic Capacitor |
| C41 | 1 | FG18C0G1H180JNT00 | 18 pF 50V Ceramic Capacitor |
| C42 | 1 | K150J15C0GF5TL2 | 15 pF 50V Ceramic Capacitor |
ICs
| Reference | Qty | Part | Description |
|---|---|---|---|
| U1, U4 | 2 | 6116SA15SOG[1] | SRAM Chip Async Single 5V 16K-Bit 2K x 8 15ns 24-Pin SOIC |
| U2 | 1 | SN74HC373N | D-Type Transparent Latch 1 Channel 8:8 IC Tri-State 20-PDIP |
| U3 | 1 | SN74HC139N | Decoder/Demultiplexer 1 x 2:4 16-PDIP |
| U7, U8 | 2 | SN74HC368N | Buffer, Inverting 2 Element 2, 4 (Hex) Bit per Element 3-State Output 16-PDIP |
| U9 | 1 | SN74HCU04N | Inverter IC 6 Channel 14-PDIP |
Alternatives
| Reference | Qty | Part | Description |
|---|---|---|---|
| U1, U4 | 2 | 6116SA15TPG | SRAM - Asynchronous Memory IC 16Kb (2K x 8) Parallel 15ns 24-PDIP |
Note
[1] If you're not comfortable working with SOIC, We recommend looking for the alternative
6116SA15TPGor use the SRAM from the OEM NES.
Connectors
| Reference | Qty | Part | Description |
|---|---|---|---|
| U5, U6 | 2 | ED40DT | 40 (2 x 20) Pos DIP, 0.6" (15.24mm) Row Spacing Socket Tin Through Hole |
| P4, P5 | 2 | S7B-PH-K-S(LF)(SN) | JST PH 2mm 7 Pins Male |
Others
| Reference | Qty | Part | Description |
|---|---|---|---|
| X1 | 1 | NTSC: ECS-214-S-4X PAL: N/A[1] |
NTSC: 21.47727MHz Crystal PAL: 26.601712MHz Crystal |
| X2 | 1 | CSTLS4M00G56-B0 | 4 MHz Ceramic Resonator Built in Capacitor 47 pF |
| D1, D2 | 2 | 1N5231BTR | Zener Diode 5.1 V 500 mW Through Hole |
| FC1 | 1 | B78108S1393K | 39 µH Unshielded Drum Core, Wirewound Inductor 470 mA 1.02Ohm Max Axial |
| FC2 | 1 | 28L0138-10R-10 | 75 Ohms @ 100 MHz 1 Ferrite Bead Axial 5A 10mOhm |
Note
[1] We couldn't find a good part number for a crystal for PAL system. We recommend searching the internet to find a 26.601712MHz crystal for PAL.