component
MCP1661T-E
Public Made by Adomby adom
Microchip Tech DC-DC Converters, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownMCP1661T-E
Microchip Tech · DC-DC Converters · SOT-23-5
MCP1661T-E from Microchip Tech, in a SOT-23-5. 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 | SW | passive | Switch node connecting the boost inductor to the internal N-channel switch drain, carrying inductor current up to 1.3A peak. |
| 2 | GND | power_in | Ground return pin for circuit ground; keep traces from input and output capacitor returns to this pin as short as possible. |
| 3 | VFB | input | Feedback voltage pin for output regulation via a resistor divider, with VFB typically 1.227V. |
| 4 | EN | input | Logic-level enable input; logic high (>85% of VIN) enables the regulator and logic low (<7.5% of VIN) disables it and lowers quiescent current. |
| 5 | VIN | power_in | Input voltage pin, to be decoupled from GND with a 4.7 µF minimum capacitor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOT-23-5 |
| Category | Power Management ICs |
| Pins | 5 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage Range | VIN | 2.4 | 5.5 | V | Note 1 | 3 | |
| Output Voltage Adjust Range | VOUT | 32 | V | Note 1 | 3 | ||
| Feedback Voltage | VFB | 1.19 | 1.227 | 1.264 | V | 3 | |
| VFB Accuracy | -3 | 3 | % | 3 | |||
| Line Regulation | /(ΔVFB/VFB)/ΔVIN/ | 0.05 | 0.5 | %/V | VIN = 3V to 5V, IOUT = 20 mA, VOUT = 12.0V | 4 | |
| Load Regulation | /ΔVFB/VFB/ | 0.5 | 1.5 | % | IOUT = 20 mA to 100 mA, VIN = 3.3V, VOUT = 12.0V | 4 | |
| Maximum Duty Cycle | DCMAX | 88 | 90 | % | Note 4 | 4 | |
| Switching Frequency | fSW | 425 | 500 | 575 | kHz | ±15% | 4 |
| EN Input Logic High | VIH | 85 | % of VIN | IOUT = 1 mA | 4 | ||
| EN Input Logic Low | VIL | 7.5 | % of VIN | IOUT = 1 mA | 4 | ||
| Operating Junction Temperature Range | TJ | -40 | 125 | °C | Steady State | 4 | |
| Storage Temperature Range | TA | -65 | 150 | °C | 4 | ||
| Maximum Junction Temperature | TJ | 150 | °C | Transient | 4 | ||
| VSW, GND | VSW | 36 | V | 3 | |||
| EN, VIN, GND | 6 | V | 3 | ||||
| VFB | VFB | 1.3 | V | 3 | |||
| Storage Temperature | -65 | 150 | °C | 3 | |||
| Ambient Temperature with Power Applied | -40 | 125 | °C | 3 | |||
| Operating Junction Temperature | -40 | 150 | °C | 3 | |||
| ESD Protection HBM | 4 | kV | All pins | 3 | |||
| Input Capacitor CIN | CIN | 4.7 | µF | Table 5-1 | 16 | ||
| Output Capacitor COUT | COUT | 10 | 47 | µF | Table 5-1 | 16 | |
| Inductance range | L | 4.7 | 10 | µH | 16 | ||
| Thermal Resistance, 5LD-SOT-23 | θJA | 201 | °C/W | 4 | |||
| UVLO start | UVLOSTART | 2.3 | V | VIN rising, IOUT = 1 mA resistive load | 3 | ||
| UVLO stop | UVLOSTOP | 1.85 | V | VIN falling, IOUT = 1 mA resistive load | 3 | ||
| Maximum Output Current | IOUT | 125 | mA | 3.3V VIN, 12V VOUT | 3 | ||
| Maximum Output Current | IOUT | 200 | mA | 5.0V VIN, 12V VOUT | 3 | ||
| Maximum Output Current | IOUT | 100 | mA | 4.2V VIN, 24V VOUT | 3 | ||
| Feedback Input Bias Current | IVFB | 0.005 | µA | 3 | |||
| No Load Input Current | IIN0 | 250 | µA | Device switching, no load, 3.3V VIN, 12V VOUT (Note 2) | 3 | ||
| Shutdown Quiescent Current | IQSHDN | 200 | nA | EN = GND, feedback divider current not included (Note 3) | 3 | ||
| Peak Switch Current Limit | IN(MAX) | 1.3 | A | Note 4 | 3 | ||
| NMOS Switch Leakage | INLK | 0.4 | µA | VIN = VSW = 5V; VOUT = 5.5V, VEN = VFB = GND | 3 | ||
| NMOS Switch ON Resistance | RDS(ON) | 0.8 | Ω | VIN = 5V, VOUT = 12V, IOUT = 100 mA (Note 4) | 3 | ||
| Overvoltage Reference | OVP_REF | 80 | mV | VFB to GND transition (Note 4) | 4 | ||
| EN Input Leakage Current | IENLK | 0.025 | µA | VEN = 5V | 4 | ||
| Soft-Start Time | tSS | 3 | ms | TA, EN Low-to-High, 90% of VOUT | 4 | ||
| Thermal Shutdown Die Temperature | TSD | 150 | °C | 4 | |||
| Die Temperature Hysteresis | TSDHYS | 15 | °C | 4 |
CAD (KiCad official)
- Symbol:
MCP1661T-E - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
mcp1661t-e-etched.step/mcp1661t-e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mcp1661t-e.step/mcp1661t-e.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (34 pp, sha256
4ee52900f5f449c6, retrieved 2026-10-23, tier: lcsc) - 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).