Monolithic Power Systems Inc. MP6400DJ-33-LF-Z

Overview

MP6400DJ-33-LF-Z from Monolithic Power Systems is a fixed-threshold supervisory IC with 3.3V monitoring (V_IT = 3.07V), ±1% threshold accuracy, 1.6µA typical quiescent current, and programmable reset delay (2.1ms–10s via CDELAY pin). It provides open-drain RESET assertion during SENSE undervoltage or MR low, supporting battery-powered microcontroller systems requiring reliable power-on reset at V_CC ≥ 0.8V.

For engineers reviewing the MP6400DJ-33-LF-Z datasheet, MP6400DJ-33-LF-Z pinout, MP6400DJ-33-LF-Z application, or MP6400DJ-33-LF-Z equivalent, key selection criteria include factory-set 3.3V threshold accuracy, TSOT23-6 package compatibility, CDELAY-configurable delay timing, and guaranteed RESET validity down to 0.8V supply.

Technical Context

The MP6400DJ-33-LF-Z implements a precision voltage monitor with internal 140nA current source charging an external capacitor on CDELAY to generate user-defined reset delays. Its comparator includes 1.5–3.5% hysteresis (V_HYS) to reject SENSE transients up to 17.5µs at 5% overdrive.

RESET output is open-drain with 0.4V max VOL at 1mA load and supports pull-up voltages up to 6V-enabling interface with higher-voltage logic. MR input features a 90kΩ internal pull-up, allowing direct connection to system logic without external biasing.

Key Specifications

Pinout & Package

MP6400DJ-33-LF-Z is housed in a 6-pin TSOT23 package (2.9mm × 1.6mm × 1.1mm height) with exposed pad for thermal enhancement and RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–33D3+ and TPS3808G33DBVR, MP6400DJ-33-LF-Z uniquely combines ultra-low 1.6µA quiescent current, ±1% threshold accuracy, and continuous 2.1ms–10s capacitor-programmable delay-enabling single-BOM flexibility across diverse timing requirements without redesign.

Availability

MP6400DJ-33-LF-Z is available at Aetrix Electronics and suitable for battery-powered microcontroller systems, FPGA configuration monitoring, and handheld consumer electronics requiring stable component supply with full RoHS compliance and TSOT23-6 footprint compatibility.

Supply support for MP6400DJ-33-LF-Z 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, motor drive, and sensing applications.

The MP6400 product line delivers ultra-low-power supervisory circuits optimized for portable and energy-sensitive systems where precision voltage monitoring and flexible reset timing are critical.

FAQ

What is the minimum V_CC at which MP6400DJ-33-LF-Z guarantees valid RESET assertion?

The device guarantees RESET assertion remains functional down to V_CC = 0.8V, enabling reliable reset generation during deep brown-out conditions before the host microcontroller loses operational integrity. This specification is validated across –40°C to +85°C ambient temperature.

Can the MP6400DJ-33-LF-Z monitor voltages other than 3.3V?

No-MP6400DJ-33-LF-Z is factory-trimmed exclusively for 3.3V nominal rail monitoring (V_IT = 3.07V). For adjustable thresholds, the MP6400DJ-01 variant must be used with an external resistor divider network on the SENSE pin.

How does the CDELAY pin configure reset delay times?

CDELAY supports three configurations: floating (24ms), tied to V_CC via 50–200kΩ resistor (380ms), or connected to GND via capacitor ≥150pF (2.1ms–10s). The internal 140nA current source charges the capacitor; RESET de-asserts when voltage reaches 1.13V.

Is an external pull-up resistor required on the RESET pin?

Yes-an external pull-up resistor ≥10kΩ is mandatory on the open-drain RESET output to define the high logic level. The pull-up may connect to any compatible voltage rail up to 6V, independent of V_CC, enabling level-shifted reset signaling.

What is the maximum transient duration the SENSE pin can reject?

The SENSE pin rejects negative transients up to 17.5µs when the overdrive magnitude equals 5% of V_IT. Shorter transients or lower overdrive levels are rejected with proportionally reduced immunity duration, preventing false resets from ESD or switching noise.

Does the MR pin require an external pull-up resistor?

No-the MR pin includes a factory-trimmed 90kΩ internal pull-up to V_CC, allowing direct connection to push-button switches or open-drain logic outputs without external components. This reduces BOM count and PCB area in manual reset implementations.