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NUC123LD4AE0

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Nuvoton Tech Microcontroller Units (MCUs/MPUs/SOCs), LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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NUC123LD4AE0

Nuvoton Tech · Microcontroller Units (MCUs/MPUs/SOCs) · LQFP-48(7x7)

NUC123LD4AE0 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.
2 PB.8 bidirectional Digital GPIO pin, or TM0 Timer0 event counter input / toggle output.
3 PB.14 bidirectional Digital GPIO pin, or INT0 external interrupt 0 input.
4 PA.11 bidirectional Digital GPIO pin, or SPI1_CLK, SPI2_MOSI0 or I2C1_SCL.
5 PA.10 bidirectional Digital GPIO pin, or SPI1_MISO0, SPI2_MISO0 or I2C1_SDA.
6 PB.4 bidirectional Digital GPIO pin, or UART1_RXD input, SPI2_SS0 or SPI1_SS1.
7 PB.5 bidirectional Digital GPIO pin, or UART1_TXD output or SPI2_CLK.
8 PB.6 bidirectional Digital GPIO pin, or UART1_nRTS output or SPI2_MOSI0.
9 PB.7 bidirectional Digital GPIO pin, or UART1_nCTS input or SPI2_MISO0.
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 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 output 3.3V decoupling pin.
15 USB_D- bidirectional USB differential signal D-.
16 USB_D+ bidirectional USB differential signal D+.
17 PC.5 bidirectional Digital GPIO pin, or SPI0_MOSI1 or UART0_TXD output.
18 PC.4 bidirectional Digital GPIO pin, or SPI0_MISO1 or UART0_RXD input.
19 PC.3 bidirectional Digital GPIO pin, or SPI0_MOSI0 or I2S_DO data output.
20 PC.2 bidirectional Digital GPIO pin, or SPI0_MISO0 or I2S_DI data input.
21 PC.1 bidirectional Digital GPIO pin, or SPI0_CLK or I2S_BCLK bit clock.
22 PC.0 bidirectional Digital GPIO pin, or SPI0_SS0 or I2S_LRCLK left/right channel clock.
23 PB.10 bidirectional Digital GPIO pin, or SPI0_SS1 or TM2 Timer2 event counter input / toggle output.
24 PB.9 bidirectional Digital GPIO pin, or SPI1_SS1, TM1 Timer1 event counter input / toggle output, or PWM1 (NUC123xxxAEx only).
25 PC.13 bidirectional Digital GPIO pin, or SPI1_MOSI1, PWM3 or CLKO frequency divider output.
26 PC.12 bidirectional Digital GPIO pin, or SPI1_MISO1, PWM2 or I2S_MCLK master clock output.
27 PC.11 bidirectional Digital GPIO pin, or SPI1_MOSI0.
28 PC.10 bidirectional Digital GPIO pin, or SPI1_MISO0.
29 PC.9 bidirectional Digital GPIO pin, or SPI1_CLK.
30 PC.8 bidirectional Digital GPIO pin, or SPI1_SS0 or PWM0 (NUC123xxxAEx only).
31 PA.15 bidirectional Digital GPIO pin, or PWM3, I2S_MCLK master clock output or CLKO frequency divider output.
32 PA.14 bidirectional Digital GPIO pin, or PWM2 output / capture input.
33 PA.13 bidirectional Digital GPIO pin, or PWM1 output / capture input.
34 PA.12 bidirectional Digital GPIO pin, or PWM0 output / capture input.
35 ICE_DAT bidirectional Serial wired debugger data pin; a 100 kΩ pull-up resistor is recommended.
36 ICE_CLK input Serial wired debugger clock input pin; a 100 kΩ pull-up resistor is recommended.
37 AVDD power_in Power supply for internal analog circuit.
38 PD.0 bidirectional Digital GPIO pin, or ADC0 analog input or SPI2_SS0.
39 PD.1 bidirectional Digital GPIO pin, or SPI2_CLK, SPI0_SS1 or ADC1 analog input.
40 PD.2 bidirectional Digital GPIO pin, or SPI2_MISO0, SPI0_MISO1 or ADC2 analog input.
41 PD.3 bidirectional Digital GPIO pin, or SPI2_MOSI0, SPI0_MOSI1 or ADC3 analog input.
42 PD.4 bidirectional Digital GPIO pin, or ADC4 analog input or SPI2_MISO1.
43 PD.5 bidirectional Digital GPIO pin, or ADC5 analog input or SPI2_MOSI1.
44 PF.0 bidirectional Digital GPIO pin, or XT1_OUT external 4~24 MHz high speed crystal output.
45 PF.1 bidirectional Digital GPIO pin, or XT1_IN external 4~24 MHz high speed crystal input.
46 nRESET input External reset input, low active, resets chip to initial state, with internal pull-up; a 10 kΩ pull-up resistor and 10 μF capacitor are recommended.
47 PF.2 bidirectional Digital GPIO pin, or ADC6 analog input, I2C0_SDA or PS2_DAT.
48 PF.3 bidirectional Digital GPIO pin, or ADC7 analog input, I2C0_SCL or PS2_CLK.

Key specifications

Parameter Value
Manufacturer Nuvoton Tech
Package LQFP-48(7x7)
Category Single Chip Microcomputer/Microcontroller
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 -0.3 7 V 82
Oscillator Frequency 1/tCLCL 4 24 MHz 82
Operating Temperature TA -40 105 °C 82
Storage Temperature TST -55 150 °C 82
Maximum Current into VDD IDD 120 mA 82
Maximum Current out of VSS ISS 120 mA 82
Maximum Current sunk by a I/O pin IIO 35 mA 82
Maximum Current sourced by a I/O pin IIO 35 mA 82
Maximum Current sunk by total I/O pins IIO 100 mA 82
Maximum Current sourced by total I/O pins IIO 100 mA 82
Operation voltage VDD 2.5 5.5 V VDD = 2.5V ~ 5.5V up to 72 MHz 83
VDD rise rate to ensure internal operation correctly VRISE 0.05 V/ms 83
Power ground VSS/AVSS -0.3 V 83
LDO output voltage VLDO 1.62 1.8 1.98 V VDD > 2.5V 83
Analog operating voltage AVDD 0 V max is VDD 83
Source Current quasi-bidirectional ISR11 -300 -370 -450 μA VDD = 4.5V, VS = 2.4V 86
Source Current quasi-bidirectional ISR12 -50 -70 -90 μA VDD = 2.7V, VS = 2.2V 86
Source Current push-pull ISR21 -24 -28 -32 mA VDD = 4.5V, VS = 2.4V 86
Source Current push-pull ISR22 -4 -6 -8 mA VDD = 2.7V, VS = 2.2V 86
Sink Current quasi-bidirectional and push-pull ISK1 10 16 20 mA VDD = 4.5V, VS = 0.45V 86
Sink Current quasi-bidirectional and push-pull ISK1 7 10 13 mA VDD = 2.7V, VS = 0.45V 86
Brown-out voltage VBO2.2 2.1 2.2 2.3 V BOV_VL [1:0] =00b 86
Brown-out voltage VBO2.7 2.6 2.7 2.8 V BOV_VL [1:0] =01b 86
Brown-out voltage VBO3.8 3.5 3.7 3.9 V BOV_VL [1:0] =10b 86
Brown-out voltage VBO4.5 4.2 4.4 4.6 V BOV_VL [1:0] =11b 86
Hysteresis range of BOD voltage VBH 30 150 mV VDD = 2.5V - 5.5V 86
Input clock frequency (external crystal) 4 24 MHz External crystal 87
Crystal temperature -40 105 °C 87
Crystal oscillator VDD VDD 2.5 5.5 V 87
Clock High Time tCHCX 10 ns 87
Clock Rise Time tCLCH 2 15 ns 87
Internal 22.1184 MHz oscillator frequency accuracy -1 1 % +25°C; VDD =5 V 88
Internal 22.1184 MHz oscillator frequency accuracy -3 3 % -40°C~+105°C; VDD=2.5 V~5.5 V 88
Internal 10 kHz oscillator frequency accuracy -30 30 % +25°C; VDD =5 V 88
Internal 10 kHz oscillator frequency accuracy -50 50 % -40°C~+105°C; VDD=2.5 V~5.5 V 88
ADC Operating voltage AVDD 2.7 5.5 V AVDD = VDD 89
LDO input voltage 2.5 5 5.5 V VDD input voltage 89
LDO output voltage 1.62 1.8 1.98 V VDD > 2.5V 89
LVR threshold voltage 1.7 2 2.3 V Temperature = 25°C 90
LVR quiescent current 5 μA VDD = 5.5 V 90
BOD quiescent current 125 μA AVDD = 5.5 V 90
USB input high (driven) VIH 2 V 91
USB input low VIL 0.8 V 91
USB differential input sensitivity VDI 0.2 V /PADP-PADM/ 91
USB differential common-mode range VCM 0.8 2.5 V Includes VDI range 91
USB single-ended receiver threshold VSE 0.8 2 V 91
USB output low (driven) VOL 0 0.3 V 91
USB output high (driven) VOH 2.8 3.6 V 91
USB output signal cross voltage VCRS 1.3 2 V 91
USB pull-up resistor RPU 1.425 1.575 kΩ 91
USB pull-down resistor RPD 14.25 15.75 kΩ 91
USB termination voltage for upstream port pull up VTRM 3 3.6 V 91
USB rising time TFR 4 20 ns CL = 50p 91
USB falling time TFF 4 20 ns CL = 50p 91
USB LDO VBUS pin input voltage VBUS 4 5 5.5 V 92
USB LDO output voltage VDD33 3 3.3 3.6 V 92
Flash supply voltage VDD 1.62 1.8 1.98 V 93
Flash power down current IPD 1 20 μA 93
SPI master data output valid time tV 7 11 ns SPI Master mode, VDD = 4.5V ~ 5.5V, 30pF loading Capacitor 94

CAD (KiCad official)

  • Symbol: NUC123LD4AE0
  • Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
  • 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
  • 3D model files: nuc123ld4ae0-etched.step / nuc123ld4ae0-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); nuc123ld4ae0.step / nuc123ld4ae0.glb are the bare package body.

Provenance

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

  • Datasheet: Nuvoton Tech datasheet (100 pp, sha256 4155f3be31484ab1, retrieved 2026-10-23, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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