Monolithic Power Systems Inc. MP6400DJ-15-LF-Z

Overview

MP6400DJ-15-LF-Z from Monolithic Power Systems is a low-quiescent-current (1.6µA typ), programmable-delay supervisory circuit in TSOT23-6 package, with factory-set 1.5V threshold voltage (V_IT = 1.40V), ±1% threshold accuracy, and reset delay configurable from 2.1ms to 10s via external capacitor on CDELAY pin. It monitors system supply rails in battery-powered microcontroller systems where reliable power-on reset and manual reset control are required.

For engineers reviewing the MP6400DJ-15-LF-Z datasheet, MP6400DJ-15-LF-Z pinout, MP6400DJ-15-LF-Z application, or MP6400DJ-15-LF-Z equivalent, this device supports precise voltage monitoring down to 0.8V V_CC, open-drain RESET output compatible with 6V pull-up, and immunity to ≤17.5µs negative SENSE transients - critical for robust embedded power sequencing.

Technical Context

The MP6400DJ-15-LF-Z implements a precision bandgap reference and comparator-based supervision architecture with internal 90kΩ MR pull-up resistor and 140nA programmable current source charging the external CDELAY capacitor. Its reset assertion logic follows a dual-input truth table: RESET goes low when either SENSE falls below 1.40V or MR drops below 0.25×V_CC.

It guarantees valid reset operation down to V_CC = 0.8V and supports noise-immune monitoring via 1.5–3.5% hysteresis on V_IT, while the open-drain RESET output allows level-shifting up to 6V - enabling compatibility with diverse host processors regardless of I/O voltage domain.

Key Specifications

Pinout & Package

MP6400DJ-15-LF-Z is housed in a 6-pin TSOT23 package (2.9mm × 1.6mm × 1.0mm height) with exposed pad not electrically connected. Pin 1 is bottom-left when reading top marking "3S" left-to-right.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–15D2T+ and TPS3808G15DBVR, MP6400DJ-15-LF-Z uniquely combines capacitor-programmable delay (2.1ms–10s), MR input, and 17.5µs transient immunity - making it optimal for systems requiring flexible timing, manual intervention, and high-noise resilience.

Availability

MP6400DJ-15-LF-Z is available at Aetrix Electronics and suitable for battery-powered microcontrollers, laptop power sequencing, FPGA configuration, and industrial sensor nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MP6400DJ-15-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 power ICs, with design centers across Asia and North America and global distribution through authorized partners.

The MP6400 product line delivers ultra-low-power, precision voltage supervision for space-constrained and energy-sensitive applications - targeting portable electronics, computing platforms, and industrial edge devices where reliability and efficiency are non-negotiable.

FAQ

What is the exact threshold voltage for MP6400DJ-15-LF-Z?

The MP6400DJ-15-LF-Z has a factory-set V_IT of 1.40V ±1%, corresponding to nominal 1.5V rail supervision. This value is laser-trimmed during production and does not require external resistor networks - confirmed in MPS datasheet Rev. 1.1, Table "STANDARD VERSIONS" and Electrical Characteristics section.

Can MP6400DJ-15-LF-Z operate below 1.8V V_CC?

Yes - MP6400DJ-15-LF-Z guarantees functional reset assertion down to V_CC = 0.8V, though its recommended operating range starts at 1.8V. Below 1.8V, SENSE monitoring remains valid, but specifications like ICC and delay accuracy are not characterized - per Absolute Maximum Ratings and Recommended Operating Conditions tables.

How do I configure a 5-second reset delay?

To achieve ~5s delay, connect a 4.7nF ceramic capacitor between CDELAY (Pin 3) and GND. Using the formula t_D ≈ 4.99 × C_DELAY (in nF) × 10⁻⁶ s, 4.7nF yields 23.4ms; however, the datasheet confirms 10nF gives 102ms typ, so 4.7nF is insufficient. Use 10nF for 102ms, or scale linearly: for 5s, C_DELAY ≈ 1000nF (1µF) - verified in Figure 7(c) and delay equation on page 10.

Is the RESET output truly 6V-tolerant?

Yes - the RESET pin is rated for up to 6V regardless of V_CC, as specified in Absolute Maximum Ratings (V_RESET = –0.3V to +6.5V). This allows direct connection to 3.3V or 5V pull-up rails without level shifters, provided external pull-up resistor ≥10kΩ is used - per Application Information section and Pin Functions table.

Does MP6400DJ-15-LF-Z support monitoring voltages other than 1.5V?

No - MP6400DJ-15-LF-Z is factory-configured exclusively for 1.5V (1.40V V_IT). For adjustable thresholds, use MP6400DJ-01 (0.4V–5V via external divider). The "-15" suffix denotes fixed 1.5V version, as defined in Ordering Information and STANDARD VERSIONS tables - no resistor network can alter its threshold.

What is the thermal resistance of the TSOT23-6 package?

The TSOT23-6 package has θ_JA = 220°C/W and θ_JC = 110°C/W, measured on a JEDEC JESD51-7 4-layer board - per Recommended Operating Conditions table. These values define power dissipation limits: at 25°C ambient, max continuous power is 0.57W, aligning with the 0.57W rating in Absolute Maximum Ratings.

Can MR be left floating without external pull-down?

Yes - MR is internally pulled up to V_CC via 90kΩ, so it defaults to logic high when unconnected. Floating MR will not assert RESET; only deliberate pull-down to <0.25×V_CC triggers reset - confirmed in Pin Functions description and Truth Table on page 8 of the datasheet.