Texas Instruments MSP430F5131IRSBT

Overview

MSP430F5131IRSBT from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller featuring 8 KB Flash, 1 KB RAM, dual 16-bit Timer_D modules (TD0/TD1), USCI_A0 (UART/IrDA/SPI) and USCI_B0 (I²C/SPI), 16-channel comparator, and 5-V-tolerant I/Os in a 40-pin QFN package. It targets battery-powered sensor systems and digital power supplies requiring sub-1-µA standby current and <5 µs wake-up.

For engineers reviewing the MSP430F5131IRSBT datasheet, MSP430F5131IRSBT pinout, MSP430F5131IRSBT application, or MSP430F5131IRSBT equivalent, key selection criteria include LPM3 current (1.1 µA @ 3 V), 16-channel comparator support, 40-pin RSB package compatibility, and absence of integrated ADC-distinguishing it from MSP430F5132 variants.

Technical Context

The MSP430F5131IRSBT belongs to the MSP430F51x1 family and implements the CPUXV2 core with 40-ns instruction cycle time, unified clock system (FLL, VLO, REFO, XT1 up to 25 MHz), and flexible power management including programmable LDO and brownout detection. It supports five low-power modes optimized for extended battery life.

Unlike the F51x2 series, the MSP430F5131IRSBT omits the 10-bit ADC10_A module and associated analog input channels (A0–A8, VREF±), confirming its role as a cost-optimized, digitally focused variant for applications where external ADC or analog sensing is handled separately.

Key Specifications

Pinout & Package

The MSP430F5131IRSBT is housed in a 40-pin Wettable Flank Quad Flat No-lead (WQFN) package, designated RSB, with 0.4-mm pitch and exposed thermal pad for enhanced thermal performance in compact designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with MSP430F5132IRSBT, the MSP430F5131IRSBT removes ADC functionality to lower cost and static power, while MSP430F5151IRSBT retains all features but doubles Flash/RAM-making the MSP430F5131IRSBT optimal for minimal, ultra-low-power digital control tasks.

Availability

MSP430F5131IRSBT is available at Aetrix Electronics and suitable for smart sensor nodes, digital power supplies, LED lighting drivers, and thermostat control units requiring stable component supply and long-term manufacturability.

Supply support for MSP430F5131IRSBT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on energy efficiency and reliability.

The MSP430F51x1 product line was designed for ultra-low-power digital control applications where integrated analog functions are unnecessary-prioritizing minimal active/standby current, fast wake-up, and flexible timer-based signal generation.

FAQ

Does the MSP430F5131IRSBT include an integrated analog-to-digital converter (ADC)?

No, the MSP430F5131IRSBT does not include an ADC. It belongs to the MSP430F51x1 family, which omits the ADC10_A module present in the F51x2 variants (e.g., MSP430F5132IRSBT). This omission reduces cost and static power consumption, making the MSP430F5131IRSBT ideal for digital-only control applications where external ADCs or purely digital sensors are used.

What is the maximum operating frequency supported by the MSP430F5131IRSBT?

The MSP430F5131IRSBT supports a maximum system clock (MCLK) frequency of 25 MHz via the XT1 high-frequency crystal oscillator. Its CPUXV2 core achieves a 40-ns instruction cycle time, enabling deterministic real-time execution at up to 25 MIPS. The FLL control loop stabilizes the DCO for consistent timing across voltage and temperature variations.

Is the MSP430F5131IRSBT pin-compatible with other devices in the MSP430F51x family?

Yes, the MSP430F5131IRSBT in the 40-pin RSB package shares identical pinout and electrical characteristics with MSP430F5132IRSBT, MSP430F5151IRSBT, and MSP430F5152IRSBT. This allows direct PCB reuse across variants-swapping to an ADC-equipped or higher-memory version requires only firmware and minor schematic updates, not layout changes.

How does the MSP430F5131IRSBT achieve ultra-low-power operation?

The MSP430F5131IRSBT achieves ultra-low-power operation through five configurable low-power modes (LPM0–LPM4.5), an integrated LDO for core voltage regulation, supply voltage supervision with brownout reset, and fast wake-up (<5 µs from LPM3). Its LPM3 current is specified at 1.1 µA @ 3 V, and LPM4.5 drops to 0.25 µA-enabling multi-year battery life in always-on sensor and control applications.

What debug interface does the MSP430F5131IRSBT support?

The MSP430F5131IRSBT supports Spy-Bi-Wire (SBW), a two-wire debug interface using RST/NMI/SBWTDIO and TEST/SBWTCK pins. This eliminates the need for a full 4-wire JTAG header, reducing PCB footprint and test complexity while enabling full in-system programming, breakpoint debugging, and memory inspection during development and field updates.