MCP121-450E/TO Microchip Integrated Circuit (Other) In Stock
The MCP121-450E/TO is a single-channel voltage supervisor and reset IC with a fixed 4.50 V trip threshold, asserting a reset output when supply voltage drops below the threshold. It is housed in a 3-pin TO-92 package for reliable MCU and processor power monitoring.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- MCP121-450E/TO Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2350(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Fixed 4.50 V reset threshold voltage for precise supply undervoltage detection
- Single-channel voltage supervisor with active-low reset output
- 3-pin TO-92 through-hole package for easy board integration
- Manual reset input not included, keeping design minimal and cost-effective
- No adjustable threshold — fixed trip point reduces BOM and simplifies design
- 7-week factory lead time with industrial-grade operating temperature range
Applications
The MCP121-450E/TO is used to monitor the power supply rail of 5 V microcontrollers, embedded processors, and digital logic systems, asserting a reset signal whenever the supply drops below 4.50 V to prevent corrupted program execution. It is a standard choice for industrial control panels, motor drive boards, and power-cycle-sensitive data logging equipment where reliable startup and brownout protection are required.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | TO-92-3 |
| Factory Lead Time | 7Weeks |
| YTEOL | 9 |
| Additional Feature | BAT BUP SW:N;MNL RST:N;OV DET:N;PW FL IP:N;PW FL IO:N;PW FL OP:N;PRG RST DLY:N;UV DET:N;WD: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 |
| Screening Level | TS 16949 |
| Supply Current-Max (Isup) | 0.02mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1V |
| Supply Voltage-Nom (Vsup) | 3V |
| Surface Mount | NO |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| 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
At what supply voltage does MCP121-450E/TO assert its reset output to protect a 5 V microcontroller?
The MCP121-450E/TO asserts the active-low reset output whenever the monitored supply voltage drops below the fixed 4.50 V threshold, holding the MCU in reset until the supply recovers above that level.
Why would a designer choose a fixed-threshold reset IC like MCP121-450E/TO over an adjustable supervisor?
A fixed 4.50 V threshold eliminates the external resistor divider required for adjustable parts, reducing component count by 2 resistors, cutting BOM cost, and removing a possible failure point in space-constrained designs.
How does the TO-92 package of MCP121-450E/TO compare to SOT-23 reset ICs in a production assembly context?
The TO-92 through-hole package is easier to hand-solder during prototyping and field repair, while SOT-23 saves more board area in SMT designs. Both provide equivalent voltage supervision functionality at the 4.50 V trip level.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.5300 | $0.53 |
| 10+ | $0.4860 | $4.86 |
| 25+ | $0.4540 | $11.35 |
| 100+ | $0.4000 | $40.00 |
| 1000+ | $0.2400 | $240.00 |
| 2000+ | $0.2350 | $470.00 |
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