SX1508B & SX1509B Ultra-Low Voltage GPIOs

Semtech SX1508B and SX1509B Ultra-Low Voltage GPIOs are general-purpose parallel input/output expanders ideal for low-power handheld battery-powered equipment. This family of GPIOs comes in 4-, 8-, and 16-channel configuration options and allows easy serial expansion of I/O through a standard 400kHz I2C interface. These devices come with a fully programmable LED Driver with an internal oscillator for enhanced lighting control. Keypad applications are also supported with an on-chip scanning engine that enables continuous keypad monitoring up to 64 keys without any additional host interaction reducing bus activity.

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Description Datasheet Availability Pricing (TWD) Filter the results in the table by unit price based on your quantity.
Qty. RoHS ECAD Model Series
Mounting Style
Package / Case
Interface Type
Number of I/Os
Interrupt Output
Supply Voltage - Min
Supply Voltage - Max
Maximum Clock Frequency
Minimum Operating Temperature
Maximum Operating Temperature
Packaging
ESD Protection
Semtech Interface - I/O Expanders 16 CHAN LOW VOLT I2C GPIO +PWM
Datasheet
20,910In Stock
24,152Expected 10/29/2026
Cut Tape
NT$126.19
NT$95.00
NT$87.12
NT$78.51
View
Reel
NT$68.83
MouseReel Available
Min.: 1
Mult.: 1
: 3,000
SX1509 SMD/SMT QFN-28 I2C, Serial 16 I/O With Interrupt 1.2 V 3.6 V 2 MHz - 40 C + 85 C Reel, Cut Tape, MouseReel 2 kV
Semtech Interface - I/O Expanders 16 CHAN LOW VOLT GPIO + PWM
Datasheet
8,368In Stock
Cut Tape
NT$126.19
NT$95.00
NT$87.12
NT$78.51
View
Reel
NT$68.83
MouseReel Available
Min.: 1
Mult.: 1
: 3,000
SX1509 SMD/SMT QFN-28 I2C, Serial 16 I/O With Interrupt 1.2 V 3.6 V 2 MHz - 40 C + 85 C Reel, Cut Tape, MouseReel 2 kV
Semtech Interface - I/O Expanders 8 CHAN LOW VOLT I2C GPIO + PWM
Datasheet
15,000Expected 12/7/2026
Cut Tape
NT$74.21
NT$54.85
NT$49.83
NT$44.45
View
Reel
NT$38.00
MouseReel Available
Min.: 1
Mult.: 1
: 3,000
SX1508 SMD/SMT QFN-20 I2C, Serial 8 I/O With Interrupt 1.2 V 3.6 V 2 MHz - 40 C + 85 C Reel, Cut Tape, MouseReel 2 kV
Semtech Interface - I/O Expanders 8 CHAN LOW VOLT I2C GPIO + PWM
Datasheet
Non-Stocked Lead-Time 26 Weeks
Reel
NT$40.15
Min.: 3,000
Mult.: 3,000
: 3,000
SX1508 SMD/SMT QFN-20 I2C, Serial 8 I/O With Interrupt 1.2 V 3.6 V 2 MHz - 40 C + 85 C Reel 2 kV