TPS3840PL45DBVR

TPS3840PL45DBVR is a TI fixed-threshold voltage supervisor (reset IC). The “PL45” denotes the 4.5-V threshold variant. It monitors the supply (Vcc) and generates a deterministic reset signal for a microcontroller or digital circuit when Vcc falls below about 4.5 V (with internal hysteresis) and releases reset when Vcc recovers. It’s designed for low quiescent current, fast, glitch-free power-up/power-down resets, and typically requires no external components. The “DBVR” suffix indicates the packaging (a tape-and-reel option in the DBV package). Typical uses include MCU/bicore systems in batteries or low-power devices where a known reset on power events is required. To use, connect Vcc to Vcc, ground to GND, and feed the RESET output into the MCU reset input (with decoupling as recommended). See the datasheet for pinout, exact timing, hysteresis, and package details.

TPS3840PL45DBVR is a 4.5 V threshold, push-pull reset supervisor. Comparable parts from other vendors include:
- Analog Devices ADM803/ADM804 family (4.63 V variants)
- Maxim MAX809/MAX810 family (4.63 V variants)
- Microchip MCP1316/MCP1317 (4.5 V class)
- ON Semiconductor NCP384/NCP385 (4.5 V class)
Note: exact threshold, output type, and package differ; use datasheets/cross-reference tools to pick an exact match.

Key features of TPS3840PL45DBVR (4.5V threshold):
- Fixed 4.5V reset threshold (TPS3840PL45 variant) for reliable supervision on standard 5V rails
- Power-on reset ensures MCU starts only after Vcc stabilizes above threshold
- Reset output is active-low (RST#) for easy MCU interconnection
- Very low quiescent current; no external components required for basic operation
- Small, RoHS-compliant package (DBVR) suitable for compact designs
- Wide operating temperature range (typical industrial range)
- Vcc operating range designed around 4.5–5.5V rails
Note: For exact electrical characteristics (tolerances, reset timeout, current sink, packaging details), refer to the datasheet.

- Pin count: 8 pins (DVB package).
- Function: Fixed-threshold voltage supervisor/reset IC; monitors VCC and generates a reset signal to a microcontroller when the supply falls below 4.5 V (POR/reset output).

- Manufacturer: Texas Instruments (TI)
- What kind of company: American multinational semiconductor company that designs and manufactures analog and embedded processing integrated circuits, headquartered in Dallas, Texas.

TPS3840PL45DBVR is a fixed-threshold voltage supervisor/reset IC (4.5 V variant) used to monitor a supply rail and generate a reset for a microcontroller or digital logic.
Typical application areas:
- Microcontroller and digital IC reset generation
- Power-on reset and brown-out protection for 4.5–5.5 V systems
- Reset supervision for multi-rail DC-DC converters and rail sequencing
- Low-quiescent-current supervision in battery-powered/portable devices
- Consumer electronics and industrial equipment requiring reliable reset signaling
- Manual reset interface with a pushbutton for user-initiated resets
Suitable for any system needing deterministic reset on power-up/down.

5-pin SC-70 / SOT-23‑5 package (DBV).