Monolithic Power Systems Inc. MP6400DJ-25-LF-Z

Overview

MP6400DJ-25-LF-Z from Monolithic Power Systems is a low-quiescent-current (1.6µA typ), programmable-delay supervisory circuit in TSOT23-6 package, with fixed 2.5V SENSE threshold (±1% accuracy), open-drain RESET output, and user-selectable delay from 2.1ms to 10s via external capacitor on CDELAY pin. It monitors system voltage in battery-powered microcontroller applications where supply stability below 0.8V must be detected.

For engineers reviewing the MP6400DJ-25-LF-Z datasheet, MP6400DJ-25-LF-Z pinout, MP6400DJ-25-LF-Z application, or MP6400DJ-25-LF-Z equivalent, key selection criteria include guaranteed reset validity down to VCC = 0.8V, immunity to ≤17.5µs negative SENSE transients, manual reset (MR) input with 90kΩ internal pull-up, and compatibility with 1.8–6V supply rails.

Technical Context

The MP6400DJ-25-LF-Z implements a precision voltage monitor with hysteresis (1.5–3.5% of VIT) and dual reset triggers: SENSE voltage falling below 2.33V (VIT) or MR pulled low. Its internal 140nA current source charges an external capacitor on CDELAY to generate delay times-enabling deterministic deassertion timing after fault clearance.

RESET assertion is open-drain with VOL ≤0.4V at IOL = 1.0mA (1.8V ≤ VCC ≤ 6V), supporting level-shifted reset signaling up to 6V. The device guarantees functional reset behavior even as VCC drops to 0.8V, making it suitable for brown-out detection in ultra-low-power wake-up sequences.

Key Specifications

Pinout & Package

MP6400DJ-25-LF-Z is housed in a 6-pin TSOT23 package (2.9mm × 1.6mm × 1.0mm height), RoHS-compliant and lead-free, with exposed pad not present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G25DBVR and MAX6326UT25+T, MP6400DJ-25-LF-Z uniquely combines ultra-low IQ, field-programmable delay, and MR input in TSOT23-6-enabling adaptive reset timing and flexible system-level control without increasing BOM count.

Availability

MP6400DJ-25-LF-Z is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial microcontroller systems, laptop embedded controllers, and FPGA configuration monitors requiring stable component supply with full lifecycle support.

Supply support for MP6400DJ-25-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, motion control, and sensing applications.

The MP6400 product line delivers ultra-low-power supervisory circuits optimized for battery longevity and precise reset timing in portable, industrial, and computing systems-addressing demand for robust power sequencing in resource-constrained environments.

FAQ

What is the exact SENSE threshold voltage for MP6400DJ-25-LF-Z?

The MP6400DJ-25-LF-Z has a nominal SENSE threshold of 2.5V, with a guaranteed VIT of 2.33V (−7% tolerance) and ±1% typical accuracy over temperature. This corresponds to the "25" suffix in the part number, indicating fixed 2.5V monitoring capability per MPS ordering documentation.

Can the reset delay be set to exactly 100ms using an external capacitor?

Yes. Using the formula t_D ≈ 4.99 × 10⁷ × C_DELAY (with C_DELAY in farads), a 2nF capacitor yields ~100ms delay. The device supports C_DELAY values from 150pF to ≥10nF, enabling precise delay tuning within the 2.1ms–10s range without trimming.

Is the RESET output compatible with 5V logic systems when VCC is 3.3V?

Yes. The open-drain RESET output supports voltage levels up to 6V regardless of VCC. When pulled up to 5V via ≥10kΩ resistor, it safely drives 5V-tolerant MCU reset inputs-even with VCC = 3.3V-without level-shifter components.

Does MP6400DJ-25-LF-Z require an external pull-up on the MR pin?

No. The MR pin features an internal 90kΩ pull-up to VCC, allowing direct connection to ground (for active-low manual reset) or leaving it unconnected for automatic operation. No external resistor is required unless driving MR from an open-drain source.

What is the minimum VCC at which RESET remains valid and asserted?

RESET remains guaranteed valid down to VCC = 0.8V. Below this, output behavior is undefined. This specification ensures reliable brown-out detection during deep undervoltage events before the MCU loses functional integrity.

How does the device handle noise on the SENSE pin?

The MP6400DJ-25-LF-Z incorporates 1.5–3.5% hysteresis on the SENSE threshold and recommends a 1–10nF bypass capacitor at the pin. This combination rejects short transients (≤17.5µs at 5% overdrive) and suppresses high-frequency noise that could cause spurious resets.