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NUC123LD4AN0

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Nuvoton Tech Microcontrollers (MCU/MPU/SOC), LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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NUC123LD4AN0

Nuvoton Tech · Microcontrollers (MCU/MPU/SOC) · LQFP-48(7x7)

NUC123LD4AN0 from Nuvoton Tech, in a LQFP-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 PVSS power_in PLL ground pin.
2 PB.8 bidirectional General-purpose digital I/O; alternate function TM0 (Timer0 event counter input / toggle output).
3 PB.14 bidirectional General-purpose digital I/O; alternate function INT0 (external interrupt 0 input).
4 PA.11 bidirectional General-purpose digital I/O; alternate functions SPI1_CLK (SPI1 serial clock), SPI2_MOSI0 (SPI2 1st MOSI) and I2C1_SCL (I2C1 clock).
5 PA.10 bidirectional General-purpose digital I/O; alternate functions SPI1_MISO0 (SPI1 1st MISO), SPI2_MISO0 (SPI2 1st MISO) and I2C1_SDA (I2C1 data input/output).
6 PB.4 bidirectional General-purpose digital I/O; alternate functions UART1_RXD (UART1 data receiver input), SPI2_SS0 (SPI2 1st slave select) and SPI1_SS1 (SPI1 2nd slave select).
7 PB.5 bidirectional General-purpose digital I/O; alternate functions UART1_TXD (UART1 data transmitter output) and SPI2_CLK (SPI2 serial clock).
8 PB.6 bidirectional General-purpose digital I/O; alternate functions UART1_nRTS (UART1 request to send output) and SPI2_MOSI0 (SPI2 1st MOSI).
9 PB.7 bidirectional General-purpose digital I/O; alternate functions UART1_nCTS (UART1 clear to send input) and SPI2_MISO0 (SPI2 1st MISO).
10 LDO_CAP power_out LDO output pin.
11 VDD power_in Power supply for I/O ports and LDO source for internal PLL and digital function; voltage range is 2.5V ~ 5V.
12 VSS power_in Ground.
13 USB_VBUS power_in USB power supply from USB host or hub.
14 USB_VDD33_CAP power_out USB internal power regulator 3.3V output, used as decoupling pin.
15 USB_D- bidirectional USB differential signal D-.
16 USB_D+ bidirectional USB differential signal D+.
17 PC.5 bidirectional General-purpose digital I/O; alternate functions SPI0_MOSI1 (SPI0 2nd MOSI) and UART0_TXD (UART0 data transmitter output).
18 PC.4 bidirectional General-purpose digital I/O; alternate functions SPI0_MISO1 (SPI0 2nd MISO) and UART0_RXD (UART0 data receiver input).
19 PC.3 bidirectional General-purpose digital I/O; alternate functions SPI0_MOSI0 (SPI0 1st MOSI) and I2S_DO (I2S data output).
20 PC.2 bidirectional General-purpose digital I/O; alternate functions SPI0_MISO0 (SPI0 1st MISO) and I2S_DI (I2S data input).
21 PC.1 bidirectional General-purpose digital I/O; alternate functions SPI0_CLK (SPI0 serial clock) and I2S_BCLK (I2S bit clock).
22 PC.0 bidirectional General-purpose digital I/O; alternate functions SPI0_SS0 (SPI0 1st slave select) and I2S_LRCLK (I2S left/right channel clock).
23 PB.10 bidirectional General-purpose digital I/O; alternate functions SPI0_SS1 (SPI0 2nd slave select) and TM2 (Timer2 event counter input / toggle output).
24 PB.9 bidirectional General-purpose digital I/O; alternate functions SPI1_SS1 (SPI1 2nd slave select) and TM1 (Timer1 event counter input / toggle output).
25 PC.13 bidirectional General-purpose digital I/O; alternate functions SPI1_MOSI1 (SPI1 2nd MOSI), PWM3 (PWM3 output / capture input) and CLKO (frequency divider output).
26 PC.12 bidirectional General-purpose digital I/O; alternate functions SPI1_MISO1 (SPI1 2nd MISO), PWM2 (PWM2 output / capture input) and I2S_MCLK (I2S master clock output).
27 PC.11 bidirectional General-purpose digital I/O; alternate function SPI1_MOSI0 (SPI1 1st MOSI).
28 PC.10 bidirectional General-purpose digital I/O; alternate function SPI1_MISO0 (SPI1 1st MISO).
29 PC.9 bidirectional General-purpose digital I/O; alternate function SPI1_CLK (SPI1 serial clock).
30 PC.8 bidirectional General-purpose digital I/O; alternate function SPI1_SS0 (SPI1 1st slave select).
31 PA.15 bidirectional General-purpose digital I/O; alternate functions PWM3 (PWM3 output / capture input), I2S_MCLK (I2S master clock output) and CLKO (frequency divider output).
32 PA.14 bidirectional General-purpose digital I/O; alternate function PWM2 (PWM2 output / capture input).
33 PA.13 bidirectional General-purpose digital I/O; alternate function PWM1 (PWM1 output / capture input).
34 PA.12 bidirectional General-purpose digital I/O; alternate function PWM0 (PWM0 output / capture input).
35 ICE_DAT bidirectional Serial wired debugger data pin.
36 ICE_CLK input Serial wired debugger clock input pin.
37 AVDD power_in Power supply for the internal analog circuit.
38 PD.0 bidirectional General-purpose digital I/O; alternate functions ADC0 (ADC channel 0 analog input) and SPI2_SS0 (SPI2 1st slave select).
39 PD.1 bidirectional General-purpose digital I/O; alternate functions SPI2_CLK (SPI2 serial clock), SPI0_SS1 (SPI0 2nd slave select) and ADC1 (ADC channel 1 analog input).
40 PD.2 bidirectional General-purpose digital I/O; alternate functions SPI2_MISO0 (SPI2 1st MISO), SPI0_MISO1 (SPI0 2nd MISO) and ADC2 (ADC channel 2 analog input).
41 PD.3 bidirectional General-purpose digital I/O; alternate functions SPI2_MOSI0 (SPI2 1st MOSI), SPI0_MOSI1 (SPI0 2nd MOSI) and ADC3 (ADC channel 3 analog input).
42 PD.4 bidirectional General-purpose digital I/O; alternate functions ADC4 (ADC channel 4 analog input) and SPI2_MISO1 (SPI2 2nd MISO).
43 PD.5 bidirectional General-purpose digital I/O; alternate functions ADC5 (ADC channel 5 analog input) and SPI2_MOSI1 (SPI2 2nd MOSI).
44 PF.0 bidirectional General-purpose digital I/O; alternate function XT1_OUT (external 4~24 MHz high speed crystal output).
45 PF.1 bidirectional General-purpose digital I/O; alternate function XT1_IN (external 4~24 MHz high speed crystal input).
46 nRESET input External reset input: low active, set this pin low to reset the chip to initial state; with internal pull-up.
47 PF.2 bidirectional General-purpose digital I/O; alternate functions ADC6 (ADC channel 6 analog input), I2C0_SDA (I2C0 data input/output) and PS2_DAT (PS/2 data).
48 PF.3 bidirectional General-purpose digital I/O; alternate functions ADC7 (ADC channel 7 analog input), I2C0_SCL (I2C0 clock) and PS2_CLK (PS/2 clock).

Key specifications

Parameter Value
Manufacturer Nuvoton Tech
Package LQFP-48(7x7)
Category Embedded Processors & Controllers
Pins 48

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
DC Power Supply (VDD - VSS) VDD-VSS -0.3 7 V 66
Oscillator Frequency 1/tCLCL 4 24 MHz 66
Operating Temperature TA -40 85 ℃ 66
Storage Temperature TST -55 150 ℃ 66
Maximum Current into VDD IDD 120 mA 66
Maximum Current out of VSS ISS 120 mA 66
Maximum Current sunk by a I/O pin IIO 35 mA 66
Maximum Current sourced by a I/O pin IIO 35 mA 66
Maximum Current sunk by total I/O pins IIO 100 mA 66
Maximum Current sourced by total I/O pins IIO 100 mA 66
Operation voltage VDD 2.5 5.5 V VDD = 2.5V ~ 5.5V up to 72 MHz 67
LDO output voltage VLDO 1.62 1.8 1.98 V VDD > 2.5V 67
Analog operating voltage AVDD 0 V 67
Brown-out voltage BOV_VL[1:0]=00b VBO 2.1 2.2 2.3 V BOV_VL [1:0] =00b 70
Brown-out voltage BOV_VL[1:0]=01b VBO 2.6 2.7 2.8 V BOV_VL [1:0] =01b 70
Brown-out voltage BOV_VL[1:0]=10b VBO 3.7 3.8 3.9 V BOV_VL [1:0] =10b 70
Brown-out voltage BOV_VL[1:0]=11b VBO 4.4 4.5 4.6 V BOV_VL [1:0] =11b 70
Hysteresis range of BOD voltage VBH 30 150 mV VDD = 2.5V - 5.5V 70
Source Current PA-PF (Quasi-bidirectional Mode) ISR11 -300 -370 -450 μA VDD = 4.5V, VS = 2.4V 70
Source Current PA-PF (Quasi-bidirectional Mode) ISR12 -50 -70 -90 μA VDD = 2.7V, VS = 2.2V 70
Source Current PA-PF (Quasi-bidirectional Mode) ISR12 -40 -60 -80 μA VDD = 2.5V, VS = 2.0V 70
Source Current PA-PF (Push-pull Mode) ISR21 -20 -24 -28 mA VDD = 4.5V, VS = 2.4V 70
Source Current PA-PF (Push-pull Mode) ISR22 -4 -6 -8 mA VDD = 2.7V, VS = 2.2V 70
Source Current PA-PF (Push-pull Mode) ISR22 -3 -5 -7 mA VDD = 2.5V, VS = 2.0V 70
Sink Current PA-PF (Quasi-bidirectional and Push-pull Mode) ISK1 10 16 20 mA VDD = 4.5V, VS = 0.45V 70
Sink Current PA-PF (Quasi-bidirectional and Push-pull Mode) ISK1 7 10 13 mA VDD = 2.7V, VS = 0.45V 70
Sink Current PA-PF (Quasi-bidirectional and Push-pull Mode) ISK1 6 9 12 mA VDD = 2.5V, VS = 0.45V 70
LDO Input Voltage 2.5 5 5.5 V VDD input voltage 74
Low Voltage Reset Operation voltage 1.7 5.5 V 74
Low Voltage Reset Quiescent current 5 uA VDD = 5.5 V 74
Low Voltage Reset Threshold voltage 1.7 2 2.3 V Temperature = 25℃ 74
Low Voltage Reset Hysteresis 0 0 0 V 74
Brown-out Detector Quiescent current 125 μA AVDD = 5.5 V 75
Flash Supply voltage VDD 1.62 1.8 1.98 V 77
Flash Power Down Current IPD 1 20 uA 77
Clock High Time tCHCX 10 nS 71
Clock Low Time tCLCX 10 nS 71
Clock Rise Time tCLCH 2 15 nS 71
Clock Fall Time tCHCL 2 15 nS 71
Input clock frequency 4 12 24 MHz External crystal 71
Crystal operating temperature -40 85 ℃ 71
Crystal VDD VDD 2.5 5 5.5 V 71
Internal 22.1184 MHz oscillator supply voltage 2.5 5.5 V 72
Calibrated Internal Oscillator Frequency (22.1184 MHz) -1 1 % +25℃; VDD =5 V 72
Calibrated Internal Oscillator Frequency (22.1184 MHz) -3 3 % -40℃+85℃; VDD =2.5 V5.5 V 72
Internal 10 kHz oscillator supply voltage 2.5 5.5 V 72
Calibrated Internal Oscillator Frequency (10 kHz) -30 30 % +25℃; VDD =5 V 72
Calibrated Internal Oscillator Frequency (10 kHz) -50 50 % -40℃+85℃; VDD=2.5 V5.5 V 72
ADC Operating Voltage AVDD 2.7 5.5 V AVDD = VDD 73
ADC input Voltage VIN 0 V 73
Integral Non-linearity Error (INL) INL -1 1 LSB Free running conversion 73
Differential Non-linearity Error (DNL) DNL -1 1 LSB Free running conversion 73
Gain Error EG -2 2 LSB 73
USB Differential common-mode range VCM 0.8 2.5 V Includes VDI range 76
USB Single-ended receiver threshold VSE 0.8 2 V 76
USB Output low (driven) VOL 0 0.3 V 76
USB Output high (driven) VOH 2.8 3.6 V 76
USB Pull-up resistor RPU 1.425 1.575 kΩ 76
USB Pull-down resistor RPD 14.25 15.75 kΩ 76
USB Termination Voltage for upstream port pull up (RPU) VTRM 3 3.6 V 76

CAD (KiCad official)

  • Symbol: NUC123LD4AN0
  • Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
  • 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
  • 3D model files: nuc123ld4an0-etched.step / nuc123ld4an0-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); nuc123ld4an0.step / nuc123ld4an0.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Nuvoton Tech datasheet (99 pp, sha256 ca512e4c313acc05, retrieved 2026-10-20, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF