Resistors

R3

330 k

Ω/0.5 W

Leaded

Any

Digi-Key

PPC330KW-1CT-ND

R4,R6

4.7 k

Ω

SMD0805

Any

R7

100 k

Ω

SMD0805

Any

R8

2.7 k

Ω

SMD0805

Any

Switches

SW1, SW2

Push button switch

right angle

Switch tactile

SPST-NO 0.05

A 12 V

TT Electronics

SWT6-R6K

Digi-Key

987-1385-ND

Document / project reference: BOM for the IR remote transmitter

ST devices

U1

STM8L101 8-bit low

power MCU

TSSOP-20

STMicroelectronics

STM8L101F2P6

Q1

PNP transistor

SOT-23

STMicroelectronics

2STR2260

Other

devices

IRLED

940 nm IR LED

3 mm through

hole

Vishay

TSAL4400

Digi-Key

751-1201-ND

BT1

3 V CR2032 battery

retainer

Memory protection

devices

BK-833

Digi-Key

BHSD-2032-SMCT-ND

Capacitors

C1

100 nF ceramic

SMD0805

Any

Resistors

R1

22

Ω

SMD0805

Any

Switches

SW1, SW2,

Carbon contact push

button switch on PCB

ENIG gold

plated carbon

contact switch

(PCB)

3

Enclosure

N/A

BOSS 3 button key

FOB enclosure

Enclosure

Boss Enclosures

2955-20R-3

Farnell

1264656

1.

C4 X2 rating is important for reliable operation. A DC rated capacitor (even rated at 1000V DC) will fail over time as it is not designed to withstand the stress conditions

present on AC supply lines. Use 330 nF for 230 V AC nominal supply voltage and increase to 680 nF for 110V AC supply.

2.

SW1, SW2, SW3 are carbon contact footprints on PCB while the actual carbon contact is integrated into the enclosure. Alternately 2 pin tactile SMD switch from

MULTICOMP part no. DTSM-32S-B can be used on the same footprint.

Table 2.

BOM (continued)

Category

Reference

designator

Component

description

Package

Manufacturer

Manufacturer’s

ordering code /

orderable part

number

Supplier

Supplier ordering code