Schematic for Arduino Pro Micro AIO Board

Explaining PC817C Optocoupler

flux

2:03

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Schematic

Using the datasheet tool.

Utilizing the knowledge tool.

Structuring the response.

Linking components effectively.

Using Knowledge Base Tool.

Looking for "device overview description" in TPC817%20SERIES_C1612.pdf

Looking for "features list" in TPC817%20SERIES_C1612.pdf

Looking for "applications typical applications" in TPC817%20SERIES_C1612.pdf

Looking for "internal structure phototransistor optocoupler description" in TPC817%20SERIES_C1612.pdf

Looking for "CTR classification PC817A PC817B PC817C PC817D differences CTR rank" in TPC817%20SERIES_C1612.pdf

Looking for "Absolute Maximum Ratings isolation voltage" in TPC817%20SERIES_C1612.pdf

Looking for "Absolute Maximum Ratings input forward current" in TPC817%20SERIES_C1612.pdf

Looking for "Absolute Maximum Ratings collector emitter voltage" in TPC817%20SERIES_C1612.pdf

Looking for "Electrical Characteristics CTR for PC817C at IF=5mA or 10mA" in TPC817%20SERIES_C1612.pdf

Looking for "Electrical Characteristics forward voltage of input diode" in TPC817%20SERIES_C1612.pdf

Looking for "Electrical Characteristics collector current, saturation voltage conditions" in TPC817%20SERIES_C1612.pdf

Looking for "Switching characteristics response time frequency bandwidth" in TPC817%20SERIES_C1612.pdf

Looking for "Package information pin configuration and outline" in TPC817%20SERIES_C1612.pdf

Using Schematic Tool.

Planning the data queries.

Here is an overview of Q5 (PC817C optocoupler), its operation, notable characteristics, and how it fits in the PC817 family.

What it is and purpose

Type: Phototransistor optocoupler (galvanic isolation between LED input and transistor output).
Purpose: Break ground loops, protect low-voltage logic from higher/noisy domains, level-shift and transfer digital or slow analog signals across an isolation barrier.

How it works in a circuit

Internals: An input IR LED optically drives a phototransistor output (no electrical connection between sides).
Typical use:
- Drive the LED with a current-limiting resistor from a control signal.
- Use the phototransistor as an open-collector output with a pull-up on the collector; the emitter returns to the isolated ground.
In this design (connections observed):
- Q5 connects to GND, to R5 (Net 13), and to the [Digital Out](Digital Out) header channel (Net 15). This is consistent with: R5 setting LED current on the input side, and the transistor side referenced to GND driving a digital output via an open-collector/pull-up arrangement.
Design tips (best practices):
- Size the LED current-limiting resistor for the needed input current; ensure the pull-up resistor allows sufficient collector current given CTR and your logic thresholds.
- For harsh environments, check CTR derating vs. temperature and adjust LED current accordingly.

Notable characteristics (from the PC817/TPC817 datasheet)

Isolation voltage (Viso): 5000 Vrms.
CTR rank “C”: MIN 200% / MAX 400% (at IF = 5 mA, VCE = 5 V).
Forward voltage of LED: 1.2 V typ, 1.4 V max (at IF = 20 mA).
Collector-emitter voltage (VCEO): 80 V.
Cut-off frequency: 80 kHz. Typical switching times: tr 4–18 µs, tf 3–18 µs.
Mechanical: DIP-4 package with creepage distance > 7.62 mm; also available in DIP-4M and SOP-4.

Common applications

MCU/PLC input-output isolation.
Power-supply feedback isolation (with appropriate linearization).
Noise and ground-loop isolation between subsystems.
Interfacing sensors or external signals to microcontrollers with different grounds.

Family/series overview (PC817 ranks)

The PC817 family is binned by CTR (current transfer ratio). Ranks differ by guaranteed CTR range at specified conditions:

PC817 CTR Ranks (IF = 5 mA, VCE = 5 V)

Table
Rank MIN CTR MAX CTR
PC817A 80% 160%
PC817B 130% 260%
PC817C 200% 400%
PC817D 300% 600%

Rank	MIN CTR	MAX CTR
PC817A	80%	160%
PC817B	130%	260%
PC817C	200%	400%
PC817D	300%	600%

How to choose among A/B/C/D

Use lower-CTR bins (A/B) when you have ample LED current and want tighter switching behavior.
Use higher-CTR bins (C/D, like Q5) when LED drive current is limited or you need larger output current for a given input current.
Note: Higher CTR bins can show more variation over temperature and may trade off speed; always consult derating and switching characteristics.

Key takeaways for Q5 (PC817C) in this project

It provides galvanic isolation for the [Digital Out](Digital Out) channel with a comfortably high CTR bin (C = 200–400%).
Ensure R5 is chosen so the LED current, multiplied by CTR(min), yields enough collector current to assert your logic level through the chosen pull-up.
Keep in mind the 5000 Vrms isolation rating and creepage: good for robust separation between domains.

All specifications above are taken directly from the PC817/TPC817 datasheet for the C rank. If you want, I can compute a recommended R5 value from your drive voltage and target LED current, and suggest a pull-up value based on your logic thresholds.

Check R5 sizing

Pick pull-up value

Confirm pin mapping

Swap to faster opto

Noise/derating check

10 days

Ready.

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Missing Footprints

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Design Rule Checks

Overlapping Copper • 203

Des	Net	Des	Net
Arduino Pro Micro:D2 (2C SDA)	Net 4	Arduino Pro Micro:5	None
Through-hole - 1	Net 4	Arduino Pro Micro:5	None
Trace 2b1b	Net 4	Arduino Pro Micro:5	None
Trace 8c81	Net 4	Arduino Pro Micro:5	None
Trace 870a	Net 4	Arduino Pro Micro:5	None
Trace 8031	Net 4	Arduino Pro Micro:5	None
Trace b819	Net 4	Arduino Pro Micro:5	None
Trace 1563	Net 5	Trace 564a	Net 2
Through-hole - 1	Net 6	Arduino Pro Micro:6	None
Through-hole - 1	Net 6	Arduino Pro Micro:6	None
Trace 06e8	Net 6	Arduino Pro Micro:6	None
Trace 9a15	Net 6	Arduino Pro Micro:6	None
Trace 434d	Net 6	Arduino Pro Micro:6	None
Trace 6833	Net 6	Arduino Pro Micro:6	None
Arduino Pro Micro:D5 (PWM)	Net 10	Arduino Pro Micro:8	None
Arduino Pro Micro:A7/D6 (PWM)	Net 14	Arduino Pro Micro:9	None
Trace 98c7	Net 14	Arduino Pro Micro:9	None
Arduino Pro Micro:A8/D8	Net 20	Arduino Pro Micro:11	None
Trace 5dad	Net 20	Arduino Pro Micro:11	None
Trace 78c9	Net 20	Arduino Pro Micro:11	None
Trace 33cd	Net 23	Arduino Pro Micro:12	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:1	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:2	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:3	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:4	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:5	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:6	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:7	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:11	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:12	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:13	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:13	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:14	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:15	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:17	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:18	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:19	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:20	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:21	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:22	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:23	None
Arduino Pro Micro:A10/D10 (PWM)	Net 27	Arduino Pro Micro:24	None
Trace 4cf5	Net 27	Arduino Pro Micro:1	None
Trace 4cf5	Net 27	Arduino Pro Micro:2	None
Trace 4cf5	Net 27	Arduino Pro Micro:3	None
Trace 4cf5	Net 27	Arduino Pro Micro:4	None
Trace 4cf5	Net 27	Arduino Pro Micro:5	None
Trace 4cf5	Net 27	Arduino Pro Micro:6	None
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Trace 4cf5	Net 27	Arduino Pro Micro:8	None
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Trace 4cf5	Net 27	Arduino Pro Micro:12	None
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Trace 4cf5	Net 27	Arduino Pro Micro:13	None
Trace 4cf5	Net 27	Arduino Pro Micro:14	None
Trace 4cf5	Net 27	Arduino Pro Micro:15	None
Trace 4cf5	Net 27	Arduino Pro Micro:16	None
Trace 4cf5	Net 27	Arduino Pro Micro:17	None
Trace 4cf5	Net 27	Arduino Pro Micro:18	None
Trace 4cf5	Net 27	Arduino Pro Micro:19	None
Trace 4cf5	Net 27	Arduino Pro Micro:20	None
Trace 4cf5	Net 27	Arduino Pro Micro:21	None
Trace 4cf5	Net 27	Arduino Pro Micro:22	None
Trace 4cf5	Net 27	Arduino Pro Micro:23	None
Trace 4cf5	Net 27	Arduino Pro Micro:24	None
Trace 84c1	Net 27	Arduino Pro Micro:1	None
Trace 84c1	Net 27	Arduino Pro Micro:2	None
Trace 84c1	Net 27	Arduino Pro Micro:3	None
Trace 84c1	Net 27	Arduino Pro Micro:4	None
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Trace 84c1	Net 27	Arduino Pro Micro:11	None
Trace 84c1	Net 27	Arduino Pro Micro:12	None
Trace 84c1	Net 27	Arduino Pro Micro:13	None
Trace 84c1	Net 27	Arduino Pro Micro:13	None
Trace 84c1	Net 27	Arduino Pro Micro:14	None
Trace 84c1	Net 27	Arduino Pro Micro:15	None
Trace 84c1	Net 27	Arduino Pro Micro:16	None
Trace 84c1	Net 27	Arduino Pro Micro:17	None
Trace 84c1	Net 27	Arduino Pro Micro:18	None
Trace 84c1	Net 27	Arduino Pro Micro:19	None
Trace 84c1	Net 27	Arduino Pro Micro:20	None
Trace 84c1	Net 27	Arduino Pro Micro:21	None
Trace 84c1	Net 27	Arduino Pro Micro:22	None
Trace 84c1	Net 27	Arduino Pro Micro:23	None
Trace 84c1	Net 27	Arduino Pro Micro:24	None
Trace 186a	Net 27	Arduino Pro Micro:1	None
Trace 186a	Net 27	Arduino Pro Micro:2	None
Trace 186a	Net 27	Arduino Pro Micro:3	None
Trace 186a	Net 27	Arduino Pro Micro:4	None
Trace 186a	Net 27	Arduino Pro Micro:5	None
Trace 186a	Net 27	Arduino Pro Micro:6	None
Trace 186a	Net 27	Arduino Pro Micro:7	None
Trace 186a	Net 27	Arduino Pro Micro:8	None
Trace 186a	Net 27	Arduino Pro Micro:9	None
Trace 186a	Net 27	Arduino Pro Micro:10	None
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Trace 186a	Net 27	Arduino Pro Micro:14	None
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Trace 186a	Net 27	Arduino Pro Micro:21	None
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Trace 186a	Net 27	Arduino Pro Micro:24	None
Trace a11c	Net 27	Arduino Pro Micro:1	None
Trace a11c	Net 27	Arduino Pro Micro:2	None
Trace a11c	Net 27	Arduino Pro Micro:3	None
Trace a11c	Net 27	Arduino Pro Micro:4	None
Trace a11c	Net 27	Arduino Pro Micro:5	None
Trace a11c	Net 27	Arduino Pro Micro:6	None
Trace a11c	Net 27	Arduino Pro Micro:7	None
Trace a11c	Net 27	Arduino Pro Micro:8	None
Trace a11c	Net 27	Arduino Pro Micro:9	None
Trace a11c	Net 27	Arduino Pro Micro:10	None
Trace a11c	Net 27	Arduino Pro Micro:11	None
Trace a11c	Net 27	Arduino Pro Micro:12	None
Trace a11c	Net 27	Arduino Pro Micro:13	None
Trace a11c	Net 27	Arduino Pro Micro:13	None
Trace a11c	Net 27	Arduino Pro Micro:14	None
Trace a11c	Net 27	Arduino Pro Micro:15	None
Trace a11c	Net 27	Arduino Pro Micro:16	None
Trace a11c	Net 27	Arduino Pro Micro:17	None
Trace a11c	Net 27	Arduino Pro Micro:18	None
Trace a11c	Net 27	Arduino Pro Micro:19	None
Trace a11c	Net 27	Arduino Pro Micro:20	None
Trace a11c	Net 27	Arduino Pro Micro:21	None
Trace a11c	Net 27	Arduino Pro Micro:22	None
Trace a11c	Net 27	Arduino Pro Micro:23	None
Trace a11c	Net 27	Arduino Pro Micro:24	None
Arduino Pro Micro:D16 (SPI MOSI)	Net 30	Arduino Pro Micro:14	None
Trace 5e6d	Net 31	Arduino Pro Micro:20	None
Trace 80dd	Net 31	Arduino Pro Micro:20	None
Gun 2 X:PIN1	Net 32	Trace 77b9	Net 38
Trace 5aba	Net 32	Trace 6e96	Net 38
Trace 5aba	Net 32	Trace 77b9	Net 38
Trace 0a7e	Net 33	Arduino Pro Micro:19	None
Trace 9767	Net 33	Arduino Pro Micro:19	None
Arduino Pro Micro:A1/D19	Net 34	Arduino Pro Micro:18	None
Trace 5b77	Net 34	Arduino Pro Micro:18	None
Trace 393e	Net 34	Arduino Pro Micro:18	None
Trace 24fc	Net 35	Trace 6e96	Net 38
Trace 4a90	Net 37	Arduino Pro Micro:17	None
Trace 8bde	Net 37	Arduino Pro Micro:17	None
Trace 01e0	Net 38	Gun 1 X:PIN1	Net 36
Trace 1efd	Net 38	R6:P1	None
Trace 6d43	Net 38	R8:P1	None
Trace 11dc	Net 38	R10:P1	None
Trace 032a	Net 38	R1:P1	None
Trace 58ff	Net 38	J1:Pin_4	None
Trace 79e4	Net 38	J1:Pin_4	None
Trace 204f	Net 38	Trace 5aba	Net 32
Trace 1721	Net 38	Arduino Pro Micro:21	None
Trace 2134	Net 38	R3:P1	None
Trace 5816	Net 38	R6:P1	None
Trace d393	Net 38	R5:P1	None
Arduino Pro Micro:GND	Net 39	Arduino Pro Micro:23	None
DC Power 5V:P2	Net 39	Trace 6d9f	Net 40
Trace 0b51	Net 39	Arduino Pro Micro:23	None
Trace 4f49	Net 39	Arduino Pro Micro:23	None
Arduino Pro Micro:7-12V Power (DC)	Net 40	Arduino Pro Micro:24	None
DC Power 5V:P1	Net 40	Trace 7568	Net 39
DC Power 5V:P1	Net 40	Trace b8ba	Net 39
Trace 6c35	Net 40	Arduino Pro Micro:24	None
Arduino Pro Micro:5	None	Through-hole - 1	Net 4
Arduino Pro Micro:5	None	Trace c832	Net 4
Arduino Pro Micro:6	None	Arduino Pro Micro:D3(I2C SCL PWM)	Net 6
Arduino Pro Micro:6	None	Trace c08f	Net 6
Arduino Pro Micro:7	None	Arduino Pro Micro:A6/D4	Net 7
Arduino Pro Micro:7	None	Trace d6ea	Net 7
Arduino Pro Micro:8	None	Trace c45c	Net 10
Arduino Pro Micro:8	None	Arduino Pro Micro:A10/D10 (PWM)	Net 27
Arduino Pro Micro:9	None	Arduino Pro Micro:A10/D10 (PWM)	Net 27
Arduino Pro Micro:10	None	Arduino Pro Micro:D7	Net 16
Arduino Pro Micro:10	None	Trace eff9	Net 16
Arduino Pro Micro:10	None	Arduino Pro Micro:A10/D10 (PWM)	Net 27
Arduino Pro Micro:12	None	Arduino Pro Micro:A9/D9 (PWM)	Net 23
Arduino Pro Micro:14	None	Trace d550	Net 30
Arduino Pro Micro:14	None	Trace fa12	Net 30
Arduino Pro Micro:16	None	Arduino Pro Micro:A10/D10 (PWM)	Net 27
Arduino Pro Micro:17	None	Arduino Pro Micro:A0/D18	Net 37
Arduino Pro Micro:19	None	Arduino Pro Micro:A2/D20	Net 33
Arduino Pro Micro:20	None	Arduino Pro Micro:A3/D21	Net 31
R2:P1	None	Trace b240	Net 38
R3:P1	None	Trace 8a5e	Net 38
R4:P1	None	Trace c9f4	Net 38
R4:P1	None	Trace f09a	Net 38
R7:P1	None	Trace e6d6	Net 38
R7:P1	None	Trace f2d7	Net 38
R8:P1	None	Trace d5c4	Net 38
R9:P1	None	Trace f918	Net 38

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	Designator	Ruleset
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀VALUE｀＊	Override rule for ＊｀VALUE｀＊
	＊｀VALUE｀＊	Override rule for ＊｀VALUE｀＊

Airwires • 2

	Designators	Net
	DC Power 5V:P2, Trace 7568:Trace 7568	Net 39
	DC Power 5V:P1, Trace 6d9f:Trace 6d9f	Net 40

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