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

Overview

MP6400DJ-33-LF-P from Monolithic Power Systems is a fixed-threshold supervisory circuit with 3.3V monitoring (V_IT = 3.07V), ±1% threshold accuracy, 1.6µA typical quiescent current, and programmable reset delay from 2.1ms to 10s via external capacitor on CDELAY pin. It features open-drain RESET output, manual reset (MR) input with internal 90kΩ pull-up, and guaranteed operation down to V_CC = 0.8V - ideal for battery-powered microcontroller systems requiring reliable power-on reset.

For engineers reviewing the MP6400DJ-33-LF-P datasheet, MP6400DJ-33-LF-P pinout, MP6400DJ-33-LF-P application, or MP6400DJ-33-LF-P equivalent, key selection criteria include its 3.3V fixed threshold, TSOT23-6 package footprint, low ICC suitability for energy-constrained designs, and CDELAY-based delay configuration flexibility across portable, FPGA, and embedded control applications.

Technical Context

The MP6400DJ-33-LF-P implements a precision voltage monitor with hysteresis (V_HYS = 1.5–3.5% of V_IT) and dual reset triggers: SENSE voltage drop below 3.07V or MR pin pulled low. Its internal 140nA current source charges an external capacitor on CDELAY to generate the reset timeout, enabling accurate delay tuning independent of supply voltage.

RESET assertion is open-drain with 0.4V max VOL at 1.0mA load and supports rail-to-rail pull-up (up to 6V), while immunity to SENSE transients ≤17.5µs ensures robustness against noise-induced false resets in noisy DC/DC or battery-supplied environments.

Key Specifications

Pinout & Package

MP6400DJ-33-LF-P is housed in a 6-pin TSOT23 package (2.9mm × 1.6mm × 1.0mm), optimized for space-constrained PCB layouts and compatible with standard pick-and-place equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326UT33+T, MP6400DJ-33-LF-P uniquely combines ultra-low I_CC, capacitor-programmable sub-100ms delays, and integrated MR - making it optimal for compact, battery-sensitive, and multi-trigger reset architectures.

Availability

MP6400DJ-33-LF-P is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, FPGA configuration systems, and battery-powered microcontroller applications requiring stable component supply and RoHS-compliant packaging.

Supply support for MP6400DJ-33-LF-P 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 in the US, China, and Taiwan.

The MP6400 product line delivers ultra-low-power, precision voltage supervision for battery-critical and space-constrained embedded systems - targeting portable electronics, industrial controls, and automotive body electronics where reliability and efficiency are paramount.

FAQ

What is the exact V_IT threshold for MP6400DJ-33-LF-P?

The MP6400DJ-33-LF-P has a factory-set threshold voltage (V_IT) of 3.07V with ±1% accuracy over temperature and supply variation. This value is trimmed during production and does not require external components to achieve 3.3V rail monitoring.

Can the reset delay be set to exactly 100ms?

Yes - a 100ms delay is achievable by connecting a 2.2nF capacitor between CDELAY and GND. The delay follows t_d ≈ 4.99 × C_DELAY (in nF) seconds, yielding ~109.8ms; a 2.0nF capacitor gives ~99.8ms, confirmed by the datasheet's design equation and test data.

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

Yes - the RESET pin is open-drain and must be pulled up externally with ≥10kΩ to a valid logic-high voltage (up to 6V). Without this resistor, the output remains floating and cannot drive a microcontroller's active-low RESET input.

Does MP6400DJ-33-LF-P support monitoring voltages other than 3.3V?

No - the "-33" suffix denotes a fixed 3.3V-monitoring version. For adjustable thresholds (e.g., 0.4V–5V), use MP6400DJ-01, which requires an external resistor divider on the SENSE pin.

What is the minimum V_CC needed for RESET to remain valid?

RESET output is guaranteed functional down to V_CC = 0.8V. Below this, the internal comparator and current source may not operate reliably, and RESET behavior becomes undefined - consistent with brown-out detection requirements in low-voltage microcontrollers.

How is the MR pin used in a typical pushbutton reset circuit?

The MR pin is internally pulled up to V_CC via 90kΩ, so a momentary switch to GND asserts RESET immediately. No external pull-up is needed; debouncing is recommended using a 100nF capacitor from MR to GND to suppress contact bounce.

What package variant does MP6400DJ-33-LF-P use?

MP6400DJ-33-LF-P uses the TSOT23-6 package (2.9mm × 1.6mm × 1.0mm), marked "3S" on top, with RoHS-compliant matte-tin lead finish and lead-free solder compatibility per JEDEC MO-193AB.