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
What are the key features of MCP121T-315E/TT?
- 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
What is MCP121T-315E/TT used for?
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.
What are the specifications of MCP121T-315E/TT?
| 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 |
Where can I find the MCP121T-315E/TT datasheet?
MCP121T-315E/TT Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP121T-315E/TT?
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.
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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 |
| 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 |
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