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MCP121T-270E

Public Made by Adom

by adom

Microchip Tech Monitors & Reset Circuits, SC-70-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MCP121T-270E

Microchip Tech · Monitors & Reset Circuits · SC-70-3

MCP121T-270E from Microchip Tech, in a SC-70-3. 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 RST output Active-low open-drain reset output (MCP121, needs external pull-up) that is low when VDD < VTRIP and goes high when VDD > VTRIP + VHYS after the 120 ms typical delay; absolute maximum is -0.6V to 13.5V w.r.t. VSS.
2 VDD power_in Positive power supply, operating range 1.0V to 5.5V (absolute maximum 7.0V).
3 VSS power_in Ground reference.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package SC-70-3
Category Power Supply Chip
Pins 3

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Operating Voltage Range VDD 1 5.5 V 3
VDD Trip Point (MCP1XX-270) VTRIP 2.591 2.63 2.67 V TA = +25°C (Note 1) 4
VDD Trip Point (MCP1XX-270) VTRIP 2.564 2.63 2.696 V Note 2 4
Threshold Hysteresis (MCP1XX-270) VHYS 0.026 0.158 V TA = +25°C 4
Operating Current, Reset Power-up Timer Inactive IDD 1 1.75 µA Reset Power-up Timer (tRPU) Inactive 3
Operating Current, Reset Power-up Timer Active IDD 20 µA Reset Power-up Timer (tRPU) Active 3
RST Low-level Output Voltage VOL 0.4 V IOL = 500 µA, VDD =VTRIP(MIN) 4
Open-drain High Voltage on Output VODH 13.5 V VDD = 3.0V, Time voltage > 5.5V applied ≤100s, current into pin limited to 2 mA, 25°C operation recommended (Note 5, Note 6) 4
VDD Detect to RST Inactive tRPU 80 120 180 ms Figure 1-1 and CL = 50 pF 5
Specified Temperature Range TA -40 125 ºC Except MCP1XX-195 5
Maximum Junction Temperature TJ 150 ºC 5
Storage Temperature Range TA -65 150 ºC 5
Absolute Maximum VDD VDD 7 V 3
Input current (VDD) 10 mA 3
Output current (RST) 10 mA 3
Rated Rise Time of VDD 100 V/µs 3
All inputs and outputs (except RST) w.r.t. VSS -0.6 V to (VDD + 1.0V) 3
RST output w.r.t. VSS -0.6 13.5 V 3
Storage temperature -65 150 °C 3
Ambient temperature with power applied -40 125 °C 3
Maximum Junction temperature with power applied 150 °C 3
Thermal Resistance, 3L-SC70 θJA 335 ºC/W 5
VDD Trip Point Tempco TTPCO 100 ppm/°C printed ±100 4
Open-drain Output Leakage Current IOD 0.1 µA 4
VDD Detect to RST Active tRPD 130 µs VDD ramped from VTRIP(MAX) + 250 mV down to VTRIP(MIN), 250 mV, per Figure 1-1, CL = 50 pF (Note 1) 5

CAD (KiCad official)

  • Symbol: MCP121T-270E
  • Footprint: Package_TO_SOT_SMD:SOT-323_SC-70
  • 3D model: SC-70-3 (KiCad packages3D, STEP)
  • 3D model files: mcp121t-270e-etched.step / mcp121t-270e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mcp121t-270e.step / mcp121t-270e.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (28 pp, sha256 46a5e4721c4ef577, retrieved 2026-10-22, tier: manufacturer)
  • 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