ET-A17
74HC595 Shift Register
8 extra outputs from 3 pins, chainable
AED 14.00
Out of stockOverview
8 extra outputs from 3 pins, chainable
The ET-A17 is built around the Nexperia 74HC595 — 8-bit serial-in, parallel-out, latched, 3-state, ±35mA per pin (70mA total). It runs from 2–6V (3.3V and 5V logic).
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Driving many LEDs
- 7-segment displays
- Expanding outputs
Key features
What makes it different
IC
Nexperia 74HC595: 8-bit serial-in, parallel-out, latched, 3-state, ±35mA per pin (70mA total)
Chain
J4 passes clocks/latch + Q7S → next board's DS
Supply
2–6V (3.3V and 5V logic)
Libraries
shiftOut(), ShiftRegister74HC595
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| IC | Nexperia 74HC595: 8-bit serial-in, parallel-out, latched, 3-state, ±35mA per pin (70mA total) |
|---|---|
| Chain | J4 passes clocks/latch + Q7S → next board's DS |
| Supply | 2–6V (3.3V and 5V logic) |
| Size | 25.4 × 20.3 mm |
|---|---|
| Mounting | 2 mounting holes (M2.5) |
| Connectors | 7-pin 2.54 mm header |
| Main IC | 74HC595D,118 (LCSC C5947) |
| Revision | Rev A |
| Libraries | shiftOut(), ShiftRegister74HC595 |
|---|
Performance
Outputs
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | Power | 2–6V |
| 2 | GND | Ground | Ground |
| 3 | DS | Signal | Serial data in |
| 4 | SHCP | Control | Shift clock |
| 5 | STCP | Control | Latch |
| 6 | OE | Control | Active low, pulled low |
| 7 | MR | Control | Reset, active low, pulled high |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-A17 74HC595 Shift Register (assembled)
- 1 × 7-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: VCC, GND, DS, SHCP, STCP, OE
- Libraries: shiftOut(), ShiftRegister74HC595
Compare
Which I/O expander?
| 74HC595 Shift Register (this board)This board | ET-A18 16-Channel Analog Multiplexer | ET-A04 MCP23017 16-Bit I/O Expander | ET-A07 PCF8574 8-Bit I/O Expander | |
|---|---|---|---|---|
| What it does | 8 extra outputs from 3 pins, chainable | Read 16 analog or digital signals with one pin | Sixteen extra GPIO pins over I²C, Qwiic | Eight extra GPIO pins over I²C, Qwiic |
| Interface | — | — | I²C up to 1.7MHz, 0x20 (0x20–0x27 via jumpers →… | I²C 100kHz, 0x20 (0x20–0x27 via jumpers); Qwiic /… |
| Best for | Driving many LEDs | Many potentiometers or sensors | Button panels and keypads | A few extra buttons or LEDs |
| Price | 14 AED | 17 AED | 19 AED | 14 AED |
Downloads
Documents and design files
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