MCP121T-315E/TT Microchip Integrated Circuit (SOT23 (3-Pin)) In Stock
The MCP121T-315E/TT is a single-channel voltage supervisor IC from Microchip with a fixed 3.15 V threshold, open-drain active-low reset output, and only 1 µA quiescent current. It monitors supply voltage and asserts a reset signal during brownout or power-up events. Available in the compact SOT-23-3 surface-mount package from authorized global distributors.
- Manufacturer
- Microchip
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- MCP121T-315E/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
- Fixed 3.15 V supervisory threshold for accurate brownout detection
- Open-drain active-low RESET output for easy wired-OR configurations
- Ultra-low 1 µA quiescent current for battery-sensitive applications
- SOT-23-3 surface-mount package for space-constrained PCB layouts
- No external components required for complete reset function
- RoHS-compliant with halogen-free construction
Applications
The MCP121T-315E/TT is designed for microcontroller reset and brownout protection in portable consumer electronics, wearable devices, and battery-powered IoT nodes where quiescent current must be kept below 1 µA. Its open-drain output allows multiple supervisors to be wired together on a shared reset bus, making it convenient for multi-rail power sequencing in compact designs. The tiny SOT-23-3 package fits easily into space-constrained layouts such as coin-cell powered sensor tags and smart card readers.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | SOT-23-3 |
| Factory Lead Time | 6Weeks |
| 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 | +3.08V |
| 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 | Mainland China, Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the MCP121T-315E/TT's 1 µA quiescent current benefit a coin-cell powered IoT sensor design?
With only 1 µA quiescent current, the MCP121T-315E/TT draws negligible power from a 220 mAh CR2032 coin cell, contributing less than 0.5% of the total power budget in typical sleep-mode sensor applications. Over a one-year deployment, the supervisor itself consumes under 9 mAh, extending battery life by months compared to supervisors with 10 µA or higher standby current.
When is an open-drain reset output preferable to a push-pull output in a microcontroller system using the MCP121T-315E/TT?
An open-drain active-low reset output is preferable when multiple devices share a single RESET bus, since each device can pull the line low independently without creating bus contention. The MCP121T-315E/TT's open-drain configuration allows a manual reset button, a watchdog timer output, and the supervisor itself to all drive the same 3-pin reset net through a single pull-up resistor, simplifying PCB routing and reducing part count.
How does the SOT-23-3 package of the MCP121T-315E/TT compare to TO-92 supervisors in a compact wearable PCB?
The SOT-23-3 surface-mount package of the MCP121T-315E/TT measures approximately 2.9 mm x 1.3 mm with 0.95 mm pitch, occupying roughly 80% less board area than a comparable TO-92 through-hole device. For a wearable PCB constrained to under 400 mm², this reduction frees space for additional sensors or battery capacity, and the surface-mount footprint eliminates the need for through-hole drilling that weakens thin, flexible substrates.
Related Guides
CL31A107MQHNNNE 1206 100 uF MLCC Selection Guide
How to choose CL31A107MQHNNNE and related 1206 MLCCs for low-voltage bulk capacitance and regulator stability.
Jul 2, 2026
CL05B103KB5NNNC 0402 10 nF X7R MLCC Selection Guide
How to choose CL05B103KB5NNNC and related 0402 MLCCs for bypassing, filtering, voltage derating, and sourcing.
Jul 2, 2026
ADAQ7768-1 Design Guide for Precision Vibration and Dynamic Signal Measurement
Design ADAQ7768-1 precision data acquisition channels for vibration and dynamic sensing with the right bandwidth, reference, clock, and layout choices.
Jun 30, 2026
AD5204BRZ10 Design Guide for SPI-Controlled Gain and Offset Calibration
Design AD5204BRZ10 digital potentiometer calibration loops with bounded trim span, safe wiper current, clean SPI routing, and reliable startup codes.
Jun 30, 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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.5300 | $0.53 |
| 25+ | $0.4400 | $11.00 |
| 100+ | $0.4000 | $40.00 |
| 1000+ | $0.2959 | $295.90 |
| 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.”