component
MCP121T-270E
Public Made by Adomby adom
Microchip Tech Monitors & Reset Circuits, SC-70-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownMCP121T-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mcp121t-270e.step/mcp121t-270e.glbare 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, primaryclaude-sonnet-5-5(text), consensusclaude-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).