TPS3840DL31DBVR

The TPS3840DL31DBVR is TI’s fixed-threshold voltage supervisor (reset IC) with watchdog for microcontrollers. It monitors the supply voltage and asserts a reset output if VCC is out of range or during power-up, ensuring the MCU starts in a known state. The DL31 suffix denotes a 3.1‑V reset threshold variant. Key features typically include low quiescent current, a defined power-on reset delay, and a reset output that remains active until the supply is stable. It also provides a watchdog/heartbeat input to force a reset if the MCU stops toggling, improving fault detection. The device is intended for embedded systems requiring reliable brownout protection and deterministic MCU reset, and comes in a small, RoHS-compliant package suitable for space-constrained designs. Applications include automotive, consumer, and portable electronics where dependable reset behavior is critical.

Equivalent voltage supervisor/reset ICs (approx. 3.1 V threshold, similar package):
- TI: TPS383x / TPS3890 families
- Microchip: MCP131 / MCP132 series
- Maxim: MAX809 / MAX810
- ON Semiconductor: NCP301 / NCP302
- Analog Devices: ADM803 / ADM806
Notes: verify exact threshold, reset polarity, output type, and package to ensure drop‑in compatibility.

Here are the key features of the TPS3840DL31DBVR (TPS3840 family, fixed 3.1 V threshold):
- Fixed reset threshold: 3.1 V
- Active-low RESET output (push-pull) suitable for MCU resets
- Manual reset input (MR) for forcing a reset
- Power-on reset with brown-out protection; guarantees a valid reset during power-up/down
- Low quiescent current (ultra-low power in normal operation)
- Wide operating supply range around the threshold (typical 2.7 V to 5.5 V, compatible with many microcontrollers)
- Temperature range suitable for industrial use (often -40°C to +125°C)
- Quick, glitch-free reset behavior with hysteresis to avoid chatter
- Small, high-density package (DBV/related small-package) for compact designs
- ESD protection and TI quality/reliability
Note: exact numbers (current, hysteresis value, package name) vary by revision; verify the datasheet for the precise electrical specs and packaging.

- Pin count: 5 pins (SOT-23-5 package)
- Function: Voltage supervisor/microcontroller reset IC with a fixed 3.1 V threshold; monitors Vcc and provides an active-low reset output to the MCU when Vcc is below threshold or during power-up/power-down.

- Manufacturer: Texas Instruments Incorporated (TI).
- What kind of company: TI is a global American semiconductor company that designs and manufactures analog and embedded processing integrated circuits (ICs) and related software; one of the world's largest semiconductor suppliers.

TPS3840DL31DBVR is a voltage supervisor/reset IC. Common application areas include:
- Microcontroller/processor reset supervision: power-on reset, brown-out protection, and manual reset input
- Embedded, IoT, wearables, and consumer electronics: reliable reset for 3.3 V/5 V rails
- Automotive electronics: ECUs, sensors, and body electronics needing safe startup and fault detection
- Industrial and medical devices with strict reset requirements during power sequencing
- Multi-rail systems: monitoring several rails and holding reset if any rail is out of spec
- Battery-powered systems requiring low quiescent current reset supervision

DBV package, an 8-pin VSSOP (Very Small Outline Package).