Finding Alternative for U2

0:00

Work done

Replaced the function of U2 from NCP176BMX330TCG to NCP176AMX330TCG (onsemi NCP176A variant) by updating U2 properties (MPN/Manufacturer/Datasheet/Role). This is the cleanest pin-compatible choice, and matches the already-present U4.
Verified wiring context stayed the same: U2 IN -> PP5V0, OUT+FB -> PP3V3, EN -> PG_PP5V0, GND -> GND (no net edits required).
Checked capacitor compatibility on the rail: existing C24 1 uF plus additional bulk/decoupling on PP3V3 meets the NCP176 stability guidance (>= 0.8 uF effective, ESR max = 1 uF, COUT 1 uF X7R/X5R recommended
Difference (A vs B):
- NCP176A adds output discharge when disabled: discharge resistance ~60 ohm typ. This is generally beneficial for clean power-down; it is the only meaningful behavior change to be aware of.

Success criteria review

✅ U2 now specifies a drop-in, pin-compatible, equal-or-better replacement: NCP176AMX330TCG (same pinout class; added output discharge feature)
✅ Schematic connections and capacitor network remain compatible; no changes required to C22 / C24 / C19
❌ ERC does not currently pass cleanly due to a pre-existing “Missing Power” ERC error on IC1, U1, and J1 (not introduced by the U2 change)
❌ I could not attach a report file because the file export permission failed in this environment

Next steps

If you want ERC/DRC fully clean, I can chase the existing Missing Power errors on IC1 / U1 / J1 and fix whatever power-pin typing/netting is triggering them.

77 days

PP5V0

PP3V3

PP3V3_SPI

PP3V3

PP5V0

PP3V3

Resistance

10kΩ

Capacitance

1uF

C13

Capacitance

1uF

Resistance

10kΩ

C18

Capacitance

1uF

USBC2.0_D_N

SPI_MISO

I2C_SDA

SPI_SCK

USBC2.0_D_P

C10

Capacitance

1uF

I2C_SCL

C15

Capacitance

1uF

SPI_SCK

Capacitance

1uF

INT_ADC_DRDY

Resistance

10kΩ

GPIO_SW1

C12

Capacitance

1uF

I2C_SDA

GPIO_SW2

SPI_MISO

C24

Capacitance

1uF

SPI_MOSI

I2C_SCL

SPI_CS

C31

Capacitance

.1uF

SPI_CS

SPI_MOSI

Manufacturer Part Number

OPT

C25

Capacitance

22uF

Inductance

2.2nH

IC1

C22

Capacitance

10uF

Capacitance

13pF

C21

Capacitance

10uF

Capacitance

1.2pF

C30

Capacitance

10uF

Inductance

2.2nH

Capacitance

13pF

MCU_TXD

MCU_RXD

MCU_BOOT

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Project Name

ESPRSSO32 Smart Scale AI Auto Layout [Power Prompt Example]

Description

Learn how to use AI Auto Layout on this ESP32 Espresso Smart Scale! In one click you’ll see AI Auto Layout perform magic. Pay close attention to how we recommend creating rulesets, zones, and fanouts. By copying the setup in this example on your own project, you’ll have a fully routed board in no time!

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$3.48–$5.87
Digi-Key	$6.26–$9.30
LCSC	$7.63–$8.56
Mouser	$10.58
TME	$3.40
Verical	$3.46–$5.59

Controls

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