MCP121T-240E/TT Microchip Integrated Circuit (SOT23 (3-Pin)) In Stock
Microchip MCP121T-240E/TT is a single-channel voltage supervisor monitoring a fixed threshold of 2.262 V to 2.378 V with an active-low reset output in a 3-pin SOT-23 package. It provides a power-on reset signal to microcontrollers when supply voltage falls below the trip threshold. The device is RoHS-compliant and suits compact battery-powered, IoT sensor, and MCU power monitoring designs.
- Manufacturer
- Microchip
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- MCP121T-240E/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-240E/TT?
- Fixed 2.4 V nominal voltage supervisor threshold (2.262 V to 2.378 V trip window) for accurate supply monitoring
- Active-low reset output for direct connection to microcontroller and logic reset pins
- Ultra-compact 3-pin SOT-23 package minimizing PCB footprint in space-constrained designs
- RoHS-compliant lead-free construction (JESD-609 e3) for consumer and industrial applications
- Single-channel dedicated supervisor with no external components required for basic reset generation
What is MCP121T-240E/TT used for?
The MCP121T-240E/TT is commonly placed near microcontroller reset pins in battery-powered IoT nodes, handheld instruments, and wearable electronics to guarantee a clean power-on reset when the supply rises above 2.4 V. Industrial sensor modules and low-voltage embedded controllers use it to prevent corrupted firmware execution during brownout conditions. Its tiny 3-pin SOT-23 footprint makes it a low-cost solution for any design monitoring a 2.4 V rail.
What are the specifications of MCP121T-240E/TT?
| Pbfree Code | Yes |
| Manufacturer Package Code | SOT-23-3 |
| Factory Lead Time | 9Weeks |
| 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 | +2.32V |
| 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-240E/TT datasheet?
MCP121T-240E/TT Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP121T-240E/TT?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
At what supply voltage does the MCP121T-240E/TT assert its reset output and what is the threshold tolerance?
The MCP121T-240E/TT asserts its active-low reset output when the monitored supply drops below a trip threshold range of 2.262 V to 2.378 V, with a nominal of 2.4 V. This tight window ensures the MCU reset pin is driven low before the supply falls to an unsafe operating level, preventing corrupted operation.
How does the MCP121T-240E/TT fit into a space-constrained wearable or IoT sensor PCB?
The MCP121T-240E/TT is housed in a 3-pin SOT-23 package, one of the smallest commercially available transistor-outline formats. With only 3 pins and a body footprint under 2 mm × 2 mm, it can be placed immediately adjacent to the MCU reset pin with very short trace routing, reducing noise susceptibility on the reset line.
Can the MCP121T-240E/TT replace a discrete RC reset circuit in a microcontroller design?
Yes. A discrete RC power-on reset circuit is sensitive to supply ramp rate and component tolerance, whereas the MCP121T-240E/TT provides a guaranteed trip at 2.262 V to 2.378 V regardless of ramp rate. Replacing the RC network with this 3-pin supervisor eliminates tuning effort and improves reset reliability across the -40°C to +125°C operating range.
Is the MCP121T-240E/TT suitable for production on RoHS-compliant assembly lines?
Yes. The MCP121T-240E/TT carries a JESD-609 e3 code and a Pb-free designation, confirming it meets RoHS Directive requirements. It is compatible with standard lead-free solder paste and reflow profiles used on SMT assembly lines producing consumer, industrial, and medical equipment.
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