XL8574AT – I/O Expander – Xinluda

The Xinluda XL8574AT is a remote 8-bit quasi-bidirectional I/O expander for the I²C-bus with an open-drain interrupt output, supplied in a SOP16W (300mil) package. It is pin- and function-compatible with the industry-standard PCF8574A.

The Xinluda XL8574AT is a remote 8-bit I/O expander that adds eight general-purpose, quasi-bidirectional I/O ports to a microcontroller over a simple two-wire I²C-bus interface (serial clock SCL and serial data SDA). Each port can be independently assigned as an input to monitor keypads or interrupt sources, or as a latched output to drive indicator devices such as LEDs directly. The XL8574AT shares the same pinout and register behavior as the widely used PCF8574A, making it a convenient sourcing alternative for designs that are GPIO-limited.

Three hardware address pins (A0, A1, A2) let up to eight XL8574A devices share a single I²C-bus. Combined with the related XL8574 (different fixed slave-address portion), up to 16 expanders can coexist on one bus, supporting as many as 128 I/Os. An active-LOW, open-drain interrupt output (INT) signals the host MCU whenever an input state changes, eliminating the need for continuous polling. An internal Power-On Reset initializes all I/Os as inputs with a weak 100µA pull-up at HIGH logic levels.

Key Features

• Remote 8-bit I²C-bus to parallel-port expander with eight quasi-bidirectional I/O ports (P0–P7)
• 100kHz I²C-bus clock frequency (Standard-mode)
• Operating supply voltage 2.5V to 6.0V (recommended operating range 2.3V to 5.5V) with non-overvoltage-tolerant I/O held to VCC via 100µA current source
• Low standby current of 2.5µA typical
• Three hardware address pins (A0, A1, A2) for up to 8 devices on the same bus
• Open-drain, active-LOW interrupt output (INT)
• Internal Power-On Reset; I/Os default to inputs at power-up
• Latched outputs directly drive LEDs; total package sink capability 80mA (current sunk by each I/O externally limited to 25mA)
• ESD protection exceeding JESD22: 2000V HBM, 200V MM, 1000V CDM; Latch-up per JESD78 (exceeds 100mA)
• Operating temperature range -40°C to +85°C; Moisture Sensitivity Level 3
• Supplied in SOP16W (300mil) package; also offered in DIP16, SOP16 (150mil) and SSOP20

Applications

• LED signs and displays
• Key pads and front-panel controls
• Industrial control and PLC equipment
• Servers and instrumentation
• Cellular telephones and mobile devices
• Products with GPIO-limited processors

Why Source XL8574AT from Pacific Component Xchange

The XL8574AT from Xinluda has limited authorized-distributor coverage in North America and the EU, which can stall production for buyers who need a PCF8574A-compatible I/O expander. Pacific Component Xchange is an independent distributor specializing in hard-to-find and end-of-life power-management ICs and interface devices. We help engineering and procurement teams secure parts like the XL8574AT when mainstream channels show no stock.

Every order is backed by our authenticity and quality-assurance process, with worldwide shipping to keep your line running. Pricing on this part is offered by quotation. Submit an RFQ today and our sourcing team will respond with current availability, lead time, and pricing for the XL8574AT.