MCP121T-270E/TT Microchip Integrated Circuit (SOT23 (3-Pin)) In Stock
MCP121T-270E/TT is a low-power voltage supervisor IC with 1 µA quiescent current and open-drain active-low reset output. Fixed 2.70 V threshold monitors supply rails in a 3-pin SOT-23 package. Available from Microchip with worldwide shipping.
- Manufacturer
- Microchip
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- MCP121T-270E/TT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2280(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-270E/TT?
- Ultra-low 1 µA quiescent current voltage supervisor with fixed 2.70 V threshold for battery-powered and energy-sensitive designs
- Open-drain active-low reset output in a 3-pin SOT-23 package, minimizing PCB footprint in space-constrained applications
- Single-channel supply monitoring with factory-set threshold, eliminating external resistor dividers and reducing BOM complexity
What is MCP121T-270E/TT used for?
The MCP121T-270E/TT is used to supervise microcontroller power rails in portable and battery-operated devices, ensuring clean reset generation when supply voltage drops below 2.70 V. Its 1 µA standby current makes it ideal for always-on monitoring in IoT nodes, wearables, and remote sensors where battery life is critical. The tiny SOT-23-3 package allows it to be placed close to the processor in compact PCB designs with minimal space overhead.
What are the specifications of MCP121T-270E/TT?
| Pbfree Code | Yes |
| Manufacturer Package Code | SOT-23-3 |
| Factory Lead Time | 23Weeks |
| 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 | +2.63V |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| ## MCP121T-270E/TT Alternates Showing results | Image |
| 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-270E/TT datasheet?
MCP121T-270E/TT Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP121T-270E/TT?
Compatible alternatives and drop-in replacements for MCP121T-270E/TT:
suggested
suggested
Frequently Asked Questions
What is the reset threshold voltage of the MCP121T-270E/TT and how does the output behave when triggered?
The MCP121T-270E/TT has a fixed 2.70 V reset threshold. When the monitored supply falls below this level, the open-drain active-low output asserts to pull the reset line low, holding the microcontroller in reset until the supply stabilizes above the threshold. This behavior prevents erratic program execution during brown-out conditions.
How much current does the MCP121T-270E/TT consume during normal operation and why does this matter for battery designs?
The MCP121T-270E/TT draws only 1 µA quiescent current during normal monitoring operation, which is critical for battery-powered designs such as IoT sensors, wearables, and handheld instruments. At this current level, a 100 mAh coin cell can power the supervisor for over 10,000 hours, making it negligible compared to other system loads.
What package does the MCP121T-270E/TT use and how small is the PCB footprint?
The MCP121T-270E/TT is housed in a 3-pin SOT-23 package (JEDEC R-PDSO-G3) with a board footprint of approximately 1.6 mm × 2.9 mm, one of the smallest available for supervisor ICs. This compact size allows placement directly adjacent to the microcontroller VDD pin, minimizing trace length for the most reliable reset detection.
When should a designer choose MCP121T-270E/TT over an adjustable-threshold supervisor for a 3.3 V system?
The MCP121T-270E/TT is preferable when the target reset threshold of 2.70 V matches the application requirement and no external resistors are desired, saving 2 components and reducing the risk of threshold drift. For a 3.3 V nominal supply, a 2.70 V threshold provides approximately 18% undervoltage headroom, which is appropriate for most microcontroller minimum operating voltages of 2.0 V to 2.5 V.
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