MCUs & Logic ICs — STM32, GD32, ESP32, 74-Series, Interface

Typical families and part numbers we quote on

Category	Examples of part numbers	Common packages	Typical use
32-bit MCU (ARM Cortex-M)	STM32F103C8T6, STM32F103RET6, STM32F407VGT6, STM32G030F6	LQFP-48/64/100, TSSOP-20	Industrial control, motor drives, instrumentation
Domestic MCU equivalents	GD32F103C8T6, GD32F303RCT6, HC32F460, APM32F103, CH32V003	LQFP, QFN, TSSOP	Cost-reduced designs, second-source strategy
8-bit MCU	ATmega328P-AU, ATmega2560, STC89C52RC, STM8S003F3	TQFP-32, DIP-28, LQFP-44	Legacy products, simple controllers, education
Wireless MCU / SoC	ESP32-WROOM-32, ESP32-S3, ESP8266EX, nRF52832, CC2541	Module, QFN-48	Wi-Fi / BLE products, IoT gateways
Logic gates & shift registers	74HC595, 74HC245, 74HC138, 74HC04, 74HCT14, CD4051	SOP-16, TSSOP-16, DIP	Glue logic, LED driving, signal routing
Level shifters & translators	TXS0108E, TXB0104, 74LVC245	TSSOP-20, VFBGA	3.3 V / 5 V interfaces, mixed-voltage buses
Interface & transceivers	MAX3232, MAX485, SP3485, CH340G, CH341A	SOP-16, SOP-8	RS-232 / RS-485 links, USB-to-UART bridges
Drivers & optocouplers	ULN2003A, ULN2803A, PC817, TLP521, L298N	SOP-16, DIP-16, DIP-4	Relay and motor driving, isolation
Analog switches & multiplexers	CD4052, ADG711, 74HC4067	SOP-16, TSSOP-24	Signal selection, sensor multiplexing

Indicative families only. Send the exact part number, package and quantity — stock and pricing on MCUs change constantly, and a suffix or temperature grade can change both.

Where we add value here

Second sources that actually work. Domestic MCUs are only useful if the pin-out and toolchain match — we flag the ones that do.
Glue logic in mixed volumes. Logic and interface devices are cheap individually and painful to buy in ones and twos; we consolidate them into one order.
Programming-adjacent parts. Crystals, reset ICs, level shifters and sockets that turn a chip order into a working build.
Long-lead mitigation. When an MCU is on allocation, we price what is genuinely available rather than promising a fantasy lead time.

What to send us

Full part number including package and temperature suffix (for example STM32F103C8T6, not "STM32F103").
Quantity, and whether partial shipments are useful to you.
Whether a pin-compatible domestic equivalent is acceptable — it often cuts cost and lead time significantly.
Flashing or programming requirements, if the part needs to arrive pre-loaded.
Tape-and-reel vs tray, if your assembly line cares.

A note on tooling and firmware: we supply components, not development services. Where a domestic equivalent needs a different toolchain, IDE or driver, we will tell you before quoting so the substitution does not surprise your engineering team after delivery.

The control layer: MCUs, SoCs, logic and interface ICs.

Send your MCU and logic list