N76E003AT20 from Nuvoton Tech, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	P0.5/PWM2/IC6/T0/AIN4	bidirectional	Port 0 bit 5. Muxed with PWM2 output, Input Capture channel 6, Timer/Counter 0 external count input T0, and ADC input channel 4.
2	P0.6/TXD/AIN3	bidirectional	Port 0 bit 6. Muxed with UART0 transmit output TXD and ADC input channel 3. UART0 TXD/RXD are software-exchangeable via AUXR1.2 (UART0PX).
3	P0.7/RXD/AIN2	bidirectional	Port 0 bit 7. Muxed with UART0 receive input RXD and ADC input channel 2.
4	P2.0/RST	input	Reset input (active-low Schmitt trigger) with internal pull-up. When RPD (CONFIG0.2) is programmed as 0, this pin is available as P2.0 input. A low pulse resets the device; POR can be formed with an external capacitor to GND.
5	P3.0/INT0/OSCIN/AIN1	bidirectional	Port 3 bit 0 available when internal oscillator is the system clock. Muxed with external interrupt 0 (INT0), external clock input XIN (when ECLK mode enabled), and ADC input channel 1.
6	P1.7/INT1/AIN0	bidirectional	Port 1 bit 7. Muxed with external interrupt 1 (INT1) and ADC input channel 0.
7	GND	power_in	Ground potential (0 V reference).
8	P1.6/ICPDA/OCDDA/TXD_1/[SDA]	bidirectional	Port 1 bit 6. Muxed with ICP data I/O, OCD (on-chip debug) data I/O, alternate UART0 transmit (TXD_1), and optional I2C SDA (I2C remap via I2CPX = I2CON.0).
9	VDD	power_in	Supply voltage input (2.4-5.5 V) for device operation.
10	P1.5/PWM5/IC7/SS	bidirectional	Port 1 bit 5. Muxed with PWM output channel 5, Input Capture channel 7, and SPI slave select input (active-low SS).
11	P1.4/SDA/FB/PWM1	bidirectional	Port 1 bit 4. Muxed with I2C data SDA, PWM fault brake input FB, and PWM output channel 1.
12	P1.3/SCL/[STADC]	bidirectional	Port 1 bit 3. Muxed with I2C clock SCL and optional external ADC start trigger STADC (STADC remap via STADCPX = ADCCON1.6).
13	P1.2/PWM0/IC0	bidirectional	Port 1 bit 2. Muxed with PWM output channel 0 and Input Capture channel 0.
14	P1.1/PWM1/IC1/AIN7/CLO	bidirectional	Port 1 bit 1. Muxed with PWM output channel 1, Input Capture channel 1, ADC input channel 7, and system clock output CLO.
15	P1.0/PWM2/IC2/SPCLK	bidirectional	Port 1 bit 0. Muxed with PWM output channel 2, Input Capture channel 2, and SPI clock SPCLK.
16	P0.0/PWM3/IC3/MOSI/T1	bidirectional	Port 0 bit 0. Muxed with PWM output channel 3, Input Capture channel 3, SPI master-out/slave-in MOSI, and Timer/Counter 1 external count input T1.
17	P0.1/PWM4/IC4/MISO	bidirectional	Port 0 bit 1. Muxed with PWM output channel 4, Input Capture channel 4, and SPI master-in/slave-out MISO.
18	P0.2/ICPCK/OCDCK/RXD_1/[SCL]	bidirectional	Port 0 bit 2. Muxed with ICP clock, OCD clock, alternate UART0 receive (RXD_1), and optional I2C clock SCL (I2C remap via I2CPX = I2CON.0).
19	P0.3/PWM5/IC5/AIN6	bidirectional	Port 0 bit 3. Muxed with PWM output channel 5, Input Capture channel 5, and ADC input channel 6.
20	P0.4/AIN5/STADC/PWM3/IC3	bidirectional	Port 0 bit 4. Muxed with ADC input channel 5, external ADC start trigger STADC, PWM output channel 3, and Input Capture channel 3.

Key specifications

Parameter	Value
Manufacturer	Nuvoton Tech
Package	TSSOP-20
Category	MCU
Pins	20

Ordering variants

Same part, different packaging or reel option.

N76E003AT20
N76E003AQ20
N76E003BQ20

CAD (KiCad official)

Symbol: N76E003AT20
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`n76e003at20.step`	267 KB	You want the bare part, or you mark your own boards.
`n76e003at20-etched.step`	2.9 MB	You want the part with `N76E003AT20` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 724 faces against 327 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Nuvoton Tech datasheet (273 pp, sha256 ce8252def999785f, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF