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NXP Semiconductors PCA9535CPW,118 — Discrete Semiconductors

NXP PCA9535CPW,118 I²C I/O Expander, 16-Bit, 400 kHz

MPNPCA9535CPW,118
End of Life

NXP PCA9535CPW,118, 16-bit I²C/SMBus I/O expander, 400 kHz clock, 2.3 V to 5.5 V supply, open-drain outputs, interrupt output, POR, -40°C to 85°C, 24-TSSOP package, Tape & Reel.

$2.46Ref. price · indicative, final on quote
NXP Semiconductors PCA9535CPW,118 datasheet (PDF)
Packaging24-TSSOP (0.173", 4.40mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

PCA9535CPW,118 specifications
ParameterValue
Output typeOpen Drain
MountingSurface Mount
Voltage2.3V ~ 5.5V
Current - output source (Sink)10mA, 25mA
Frequency400 kHz
InterfaceI²C, SMBus
Operating temperature-40°C ~ 85°C
PackageTape & Reel (TR); Cut Tape (CT)
FeaturesPOR
Number of i (O)16
Case24-TSSOP (0.173\", 4.40mm Width)
Interrupt outputYes

Product details

The 400 kHz I²C clock rate is standard Fast-mode, compatible with most MCU I²C peripherals without needing a clock-stretch workaround. The 10 mA source and 25 mA sink per pin are enough to drive a standard LED directly (with a series resistor) or to pull a logic input high/low — but not enough for a relay coil without an external transistor. The POR (Power-On Reset) feature ensures all I/O channels start in a known high-impedance state, which avoids unintended actuator activation during power-up. The interrupt output saves firmware cycles: the host reads the expander only when an input changes, rather than polling the I²C bus continuously.

Housed in a 24-TSSOP (4.40 mm body width), surface-mount only.

For a BOM freeze, this part carries no near-term obsolescence risk.

Frequently asked questions

What voltage does PCA9535CPW,118 support?

The supply voltage range is 2.3 V to 5.5 V. This covers 3.3 V and 5 V logic rails, and allows the expander to bridge between a 3.3 V MCU and 5 V peripherals.

What are alternatives to PCA9535CPW,118?

The closest pin-compatible alternative in the same family is the PCA9535PW. The two parts share the same footprint, I²C interface, and 16-bit I/O count. The primary difference is that the PCA9535CPW includes a Power-On Reset (POR) feature, which the PCA9535PW lacks — the POR ensures all outputs start in a known high-impedance state on power-up. If your design requires that deterministic startup behavior, the PCA9535CPW is the correct choice.

How does PCA9535CPW,118 differ from PCA9535PW?

The PCA9535CPW includes a Power-On Reset (POR) feature; the PCA9535PW does not. Both are 16-bit I²C I/O expanders in 24-TSSOP with the same pinout. The POR in the PCA9535CPW ensures all I/O channels start in a known high-impedance state, which is important for applications where outputs must not be active during power-up transients.