MCP121T-300E/TT Microchip Integrated Circuit (SOT23 (3-Pin)) In Stock
Microchip MCP121T-300E/TT is a single-channel voltage supervisor with open-drain active-low reset output and ultra-low 1 µA quiescent current in a tiny SOT-23-3 package. It monitors a 3.0 V threshold to protect microcontrollers and logic from brownout conditions. Available from stock worldwide with competitive pricing and fast shipping.
- Manufacturer
- Microchip
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- MCP121T-300E/TT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2400(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
- Ultra-low 1 µA quiescent current extends battery life in power-constrained portable designs
- Precise 3.0 V threshold monitoring with open-drain active-low output for direct MCU reset interfacing
- 3-pin SOT-23-3 package minimises PCB footprint in space-critical board layouts
Applications
The MCP121T-300E/TT is ideal for supervising 3.0 V supply rails in battery-operated IoT nodes, wearable devices, and portable medical instruments where the 1 µA standby current has a significant impact on run time. Its open-drain reset output connects directly to microcontroller reset pins, ensuring orderly power-up and brownout recovery without external glue logic. The tiny SOT-23-3 footprint also suits compact handheld consumer electronics and automotive body-control modules requiring reliable voltage monitoring.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | SOT-23-3 |
| Factory Lead Time | 14Weeks |
| 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 | R-PDSO-G3 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TO-236 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| 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 | YES |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +2.93V |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Package | SOT23 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
At what voltage level does MCP121T-300E/TT assert its reset signal?
The MCP121T-300E/TT asserts its active-low open-drain reset output when the monitored supply falls below its 3.0 V threshold, holding the reset line low until the supply recovers above that level, which prevents corrupted operation in 3.3 V and 3.0 V microcontroller systems.
How does the 1 µA quiescent current of MCP121T-300E/TT benefit battery-powered designs?
With only 1 µA of quiescent current, the MCP121T-300E/TT adds negligible drain on a 100 mAh coin cell, extending battery life by months compared with supervisors drawing tens of microamps, making it an excellent fit for wireless sensor nodes and wearable devices that run for years on a single cell.
Which microcontroller reset configurations are compatible with the open-drain output of MCP121T-300E/TT?
The open-drain active-low output is compatible with any MCU that has an active-low reset pin, including common 3.3 V and 5 V devices. A pull-up resistor of 10 kΩ to VCC is typically used; the output can also be wire-ORed with other open-drain reset sources for multi-fault reset schemes.
How compact is the SOT-23-3 package of MCP121T-300E/TT for tight PCB designs?
The SOT-23-3 package measures approximately 2.9 mm × 1.3 mm with a height of 1.3 mm, making it one of the smallest 3-pin packages available. This allows designers to place the supervisor within millimetres of the MCU reset pin, minimising trace length and improving noise immunity in dense, multi-layer PCBs.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.5300 | $0.53 |
| 10+ | $0.3788 | $3.79 |
| 25+ | $0.3467 | $8.67 |
| 100+ | $0.3286 | $32.86 |
| 3000+ | $0.2450 | $735.00 |
| 9000+ | $0.2400 | $2160.00 |
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