MCP120-450DI/TO Microchip Integrated Circuit (Other) In Stock
Microchip MCP120-450DI/TO is a single-channel microcontroller voltage supervisor that asserts a reset signal when supply voltage drops below 4.50 V, ensuring safe MCU startup and brownout recovery. Fixed threshold with active-low open-drain reset output and no watchdog timer in a compact TO-92-3 through-hole package. Available from stock worldwide for embedded reset and power monitoring designs.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- MCP120-450DI/TO Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.1402(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Fixed 4.50 V trip threshold with accurate voltage monitoring for reliable microcontroller reset assertion during supply brownout or slow power-up conditions
- Active-low open-drain reset output is compatible with 3.3 V and 5 V microcontrollers and can be wire-OR'd with other reset sources without additional logic
- TO-92-3 through-hole package with 3 pins enables direct breadboard prototyping and through-hole PCB assembly with minimal footprint and no soldering complexity
Applications
The MCP120-450DI/TO is used to provide a reliable power-on reset and brownout detection for PIC, AVR, and other 5 V microcontrollers in embedded control systems where an undetected low-voltage condition could cause firmware corruption or erratic operation. Its simple 3-pin interface makes it a minimal-component solution for adding supervisor functionality to designs that use microcontrollers without an integrated brownout detector. The device is also suited for reset sequencing in industrial control panels and appliance controllers where the MCU must not execute code until the supply reaches a valid 4.50 V level.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | TO-92-3 |
| Factory Lead Time | 7Weeks |
| YTEOL | 8 |
| Additional Feature | MNL RST:N;PW FL IO:N;PRG RST DLY:N;WD:N;WDO:N;WWD:N |
| Adjustable Threshold | NO |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | O-PBCY-T3 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SIP3,.1,50 |
| Package Shape | ROUND |
| Package Style | CYLINDRICAL |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 0.06mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 1.27mm |
| Terminal Position | BOTTOM |
| Threshold Voltage-Nom | +4.38V |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Philippines, Taiwan |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the reset threshold voltage of the MCP120-450DI/TO, and what supply condition triggers its reset output?
The MCP120-450DI/TO has a fixed reset threshold of 4.50 V. When the monitored supply voltage drops below 4.50 V, the device asserts its active-low open-drain RESET output, holding the microcontroller in reset. The output remains asserted until the supply rises back above 4.50 V and the internal timeout delay elapses, ensuring a clean power-on reset at startup.
How does the open-drain reset output of the MCP120-450DI/TO support shared reset bus designs with multiple reset sources?
The open-drain RESET output can be wire-OR'd directly with other active-low reset sources such as a manual reset button or a watchdog timer output on a shared reset bus. Multiple open-drain devices can pull the same RESET line low simultaneously without contention or the need for diodes, simplifying reset circuit design in systems with 3 or more reset-generating components on a single microcontroller RESET pin.
For a 5 V PIC16F microcontroller board, how does adding the MCP120-450DI/TO improve firmware reliability compared to relying solely on the MCU's internal POR?
Many PIC16F internal power-on reset circuits guarantee reset only when the supply rises above approximately 2.0 V, not at the 4.5 V level required for reliable 5 V Flash write and erase operations. The MCP120-450DI/TO adds an external brownout trip at 4.50 V, preventing the MCU from executing code during a slow supply ramp or a brownout dip between 2.0 V and 4.5 V, where unintended Flash writes could corrupt program memory.
What package does the MCP120-450DI/TO use, and in what design phase is the TO-92-3 format most useful?
The MCP120-450DI/TO is housed in a TO-92-3 (3-pin plastic transistor) through-hole package. This format is most useful during prototyping and early hardware bring-up phases when boards are assembled by hand, since TO-92 parts insert directly into breadboards and strip-boards without soldering adapters. For production designs requiring reflow assembly, Microchip offers the same MCP120 supervisor in SOT-23 surface-mount packages.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.1402 | $0.14 |
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