MCP131T-315E/LB

The MCP131T-315E/LB is Microchip’s fixed-threshold voltage supervisor (reset detector) with a 3.15 V trip point. The “315” indicates the 3.15 V trip; “E/LB” denotes packaging style and lead-free RoHS compliance, with “T” for Tape & Reel. It monitors VDD and asserts an active-low reset when supply voltage falls below the threshold, providing a reliable reset on power-up and brownouts. It’s designed for low quiescent current in 1.8–5.0 V systems and uses a simple 3-pin interface (VDD, GND, RESET). The RESET output is typically suitable for wiring with other devices on a shared reset line. This device is well-suited for MCU and digital logic reset supervision in battery-powered or low-power embedded applications. For exact electrical specs, timing, and packaging options, consult the Microchip datasheet.

Equivalents for MCP131T-315E/LB (3.15 V fixed-threshold reset, active-low) include:
- TI TLV803 family (3.0–3.3 V options)
- Onsemi CAT803/CAT804 (3.0–3.3 V)
- Maxim MAX809/MAX810 (3.0–3.3 V)
- Analog Devices ADM803/ADM809
Ensure matching reset polarity, debounce/delay, packaging and temperature range for your BOM.

MCP131T-315E/LB features (concise):
- Fixed 3.15 V reset threshold (MCP131T-315E) for precise supervision.
- Power-on reset (POR) with defined reset when Vcc ramps up and a clean release on stable Vcc.
- Manual reset input (MR) to force a reset externally.
- Push-pull RESET output capable of driving MCU reset lines.
- Very low quiescent current (microamp range) in normal operation.
- Wide operating voltage range (typical 2.7–5.5 V) and extended temp range (-40°C to +125°C).
- Small lead-free package options (LB suffix; Tape & Reel).
- Suitable for MCU/MPU reset supervision and brown-out protection.

- Pin count: 3 pins (SOT-23-3 package).
- Function: Voltage detector / reset supervisor with a fixed 3.15 V threshold. It monitors VDD and provides an active-low reset output to the MCU; resets on power-up/power-down to ensure proper startup. No external components required.

- Manufacturer: Microchip Technology Inc.
- What kind of company: A global American semiconductor company that designs and manufactures microcontrollers (e.g., PIC), analog and interface ICs, memory, and related embedded control solutions. It is a publicly traded company (NASDAQ: MCHP).

Applications of MCP131T-315E/LB:
- Reset supervision for microcontrollers/digital ICs in 3V–5V systems (threshold ~3.15V)
- Power-on reset and brown-out protection to ensure proper startup/shutdown
- Used in embedded, battery-powered devices, automotive, industrial control, consumer electronics, data acquisition, and medical equipment requiring deterministic resets
- Can serve as a standalone reset generator or with other supervisory circuitry to prevent unreliable MCU operation during supply dips

The MCP131T-315E/LB is offered in a SOT-23-3 (3-pin) plastic package.