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UCD3138RHAT

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Texas Instruments Supervisor And Reset ICs, VQFN-40-EP(6x6). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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UCD3138RHAT

Texas Instruments · Supervisor And Reset ICs · VQFN-40-EP(6x6)

UCD3138RHAT from Texas Instruments, in a VQFN-40-EP(6x6). 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 AGND power_in Analog ground reference for differential error ADC and analog circuitry
2 AD13 input 12-bit ADC channel 13 input; connected to comparator E for current-sharing DAC output selection
3 AD06 input 12-bit ADC channel 6 input; connected to comparator F for DAC output selection
4 AD04 input 12-bit ADC channel 4 input; connected to comparator D for DAC output selection
5 AD03 input 12-bit ADC channel 3 input; connected to comparators B and C for overvoltage/undervoltage protection
6 DGND power_in Digital ground reference for digital circuitry and logic
7 /RESET input Device reset input, active-low; device resets when this pin is pulled below threshold
8 ADC_EXT_TRIG input External ADC conversion trigger input; multiplexed with TCAP, SYNC, and PWM0 functions
9 PMBUS_CLK tri_state Open-drain PMBus/I2C clock line; can be configured as SCI_TX0 UART output
10 PMBUS_DATA tri_state Open-drain PMBus/I2C data line; can be configured as SCI_RX0 UART input
11 DPWM0A output Digital PWM output 0A with 250ps pulse-width resolution; supports up to 2MHz switching frequency
12 DPWM0B output Digital PWM output 0B with 250ps pulse-width resolution; supports up to 2MHz switching frequency
13 DPWM1A output Digital PWM output 1A with 250ps pulse-width resolution; supports up to 2MHz switching frequency
14 DPWM1B output Digital PWM output 1B with 250ps pulse-width resolution; supports up to 2MHz switching frequency
15 DPWM2A output Digital PWM output 2A with 250ps pulse-width resolution; supports up to 2MHz switching frequency
16 DPWM2B output Digital PWM output 2B with 250ps pulse-width resolution; supports up to 2MHz switching frequency
17 DPWM3A output Digital PWM output 3A with 250ps pulse-width resolution; supports up to 2MHz switching frequency
18 DPWM3B output Digital PWM output 3B with 250ps pulse-width resolution; supports up to 2MHz switching frequency
19 PMBUS_ALERT tri_state Open-drain PMBus alert signal output; configurable as general-purpose GPIO
20 PMBUS_CTRL tri_state Open-drain PMBus control signal line; configurable as general-purpose GPIO
21 TCK input JTAG test clock input for debugging or manufacturer test; multiplexed with TCAP, SYNC, and PWM0
22 TDO output JTAG test data output for debugging; can be configured as SCI_TX0, PMBUS_ALERT, or FAULT0
23 TDI input JTAG test data input for debugging; can be configured as SCI_RX0, PMBUS_CTRL, or FAULT1
24 TMS input JTAG test mode select input for debugging or manufacturer test; configurable as GPIO
25 FAULT2 input External fault input 2; detects external fault conditions for protection
26 DGND power_in Digital ground reference for digital circuitry and logic
27 V33D power_in Digital 3.3V core supply input; nominal 3.3V with recommended 4.7µF and 10nF bypass capacitors
28 BP18 power_in 1.8V bypass pin for internal regulator; requires 1µF and 10nF bypass capacitors to ground
29 AGND power_in Substrate analog ground reference; connected to internal silicon substrate
30 AGND power_in Analog ground reference for differential error ADC and analog circuitry
31 EAP0 input Error ADC channel 0 positive input; positive terminal of differential feedback measurement for loop 0
32 EAN0 input Error ADC channel 0 negative input; negative terminal of differential feedback measurement for loop 0
33 EAP1 input Error ADC channel 1 positive input; positive terminal of differential feedback measurement for loop 1
34 EAN1 input Error ADC channel 1 negative input; negative terminal of differential feedback measurement for loop 1
35 EAP2 input Error ADC channel 2 positive input; recommended for peak current mode control applications; positive terminal of differential measurement for loop 2
36 AGND power_in Analog ground reference for differential error ADC and analog circuitry
37 V33A power_in Analog 3.3V supply input; powers analog circuitry with internal regulator; requires 4.7µF and 10nF bypass capacitors
38 AD00 input 12-bit ADC channel 0 input; connected to internal current source for PMBus address detection
39 AD01 input 12-bit ADC channel 1 input; connected to internal current source for PMBus address detection
40 AD02 input 12-bit ADC channel 2 input; connected to comparator A for current-sharing bus monitoring
41 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package VQFN-40-EP(6x6)
Category Power Management (PMIC)
Pins 41

CAD (KiCad official)

  • Symbol: UCD3138RHAT
  • Footprint: Package_DFN_QFN:QFN-40-1EP_6x6mm_P0.5mm_EP4.6x4.6mm
  • 3D model: VQFN-40-EP(6x6) (KiCad packages3D, STEP)
  • 3D model files: ucd3138rhat-etched.step / ucd3138rhat-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ucd3138rhat.step / ucd3138rhat.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (102 pp, sha256 5ebcb7f0fa3d9854, retrieved 2026-10-07, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-4-5-20251001 (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