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
What are the key features of MCP121T-300E/TT?
- 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
What is MCP121T-300E/TT used for?
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.
What are the specifications of MCP121T-300E/TT?
| 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 |
Where can I find the MCP121T-300E/TT datasheet?
MCP121T-300E/TT Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP121T-300E/TT?
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.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
More from Microchip
| 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 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“We've been using FindMyChip for 2 years. Pricing is consistently 20-30% below Mouser/DigiKey for volume orders.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit