Diodes Incorporated DMN1021UCA4-7

Overview

DMN1021UCA4 from Diodes Incorporated is an N-channel enhancement-mode MOSFET in a 0.76 mm × 0.76 mm CSP package, rated for 12 V V_DS, 20 mΩ R_DS(ON) at V_GS = 2.5 V, and 7.4 A continuous drain current at T_A = +25°C. It serves as a low-voltage, high-efficiency load switch or synchronous rectifier in space-constrained battery management and DC-DC converter circuits.

For engineers reviewing the DMN1021UCA4 datasheet, DMN1021UCA4 pinout, DMN1021UCA4 application, or DMN1021UCA4 equivalent, key selection criteria include its ultra-low profile (0.275 mm height), gate threshold voltage of 0.73 V (typ), 1.8 W power dissipation on FR-4 PCB, and J-STD-020 Level 1 moisture sensitivity - all critical for miniaturized portable and automotive power designs.

Technical Context

This MOSFET employs a trench-gate silicon process optimized for low R_DS(ON) at logic-level gate drive (V_GS ≥ 2.5 V), enabling direct interface with 3.3 V or 2.5 V microcontrollers without level-shifting. Its 409 pF input capacitance and 5.1 nC total gate charge support fast switching in high-frequency buck converters.

The device integrates a body diode with 0.74 V forward voltage at 1.8 A and exhibits normalized R_DS(ON) variation of ≤1.6× across −55°C to +150°C junction temperature, ensuring stable conduction in thermally aggressive environments like battery packs and PMICs.

Key Specifications

Pinout & Package

Package: X2-TSN0808-4, 4-terminal Chip-Scale Package (CSP) with NiAu-plated terminals, moisture sensitivity Level 1, weight 0.00034 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel logic-level MOSFET applications.

Compared with DMN1021UCB4-7, the DMN1021UCA4 trades 0.075 mm height reduction for ~13% higher R_θJA; versus AO3414, it delivers true 2.5 V logic compatibility and 60% smaller footprint - making it optimal for next-gen wearables and foldable displays where volume and gate drive voltage are limiting factors.

Availability

DMN1021UCA4 is available at Aetrix Electronics and suitable for battery management systems, USB-C power delivery sinks, and point-of-load DC-DC converters requiring stable component supply, consistent parametric performance, and long-term lifecycle assurance.

Supply support for DMN1021UCA4 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-performance, energy-efficient components for power management, signal integrity, and connectivity applications.

The DMN1021UCA4 belongs to Diodes' X2-CSP logic-level MOSFET product line, engineered specifically for ultra-compact, high-density power switching in portable electronics where board space, thermal envelope, and low-voltage control are primary design constraints.

FAQ

Is DMN1021UCA4 qualified for automotive applications?

No - while the DMN1021UCA4 meets AEC-Q101 stress-test guidelines in structure and process, it is not officially AEC-Q101 qualified or PPAP-capable. Diodes offers the pin-compatible DMN1021UCA4Q variant (with "Q" suffix) for automotive-grade applications requiring full qualification and IATF 16949 manufacturing.

What is the maximum safe operating frequency with DMN1021UCA4 in a buck converter?

Based on its 5.1 nC Q_g, 10.8 ns t_r, and 31.0 ns t_d(OFF), the DMN1021UCA4 supports stable operation up to 2 MHz in well-designed synchronous buck topologies with optimized gate driver impedance and PCB layout - verified in Diodes' reference design DN05021.

Can DMN1021UCA4 be used in reverse-biased (source-to-drain) conduction mode?

Yes - its body diode has a typical V_SD of 0.74 V at 1.8 A and is rated for continuous forward conduction. However, reverse-biased operation (drain negative relative to source) is limited to −12 V by V_DS rating; no avalanche energy rating is specified, so repetitive reverse recovery must be managed externally.

Does the X2-TSN0808-4 package require special reflow or soldering profiles?

Yes - due to its 0.275 mm height and fine-pitch terminals, the DMN1021UCA4 requires adherence to IPC-J-STD-020 Level 1 profile: peak temperature ≤260°C, time above 217°C ≤60 seconds, and ramp rate ≤3°C/s. Diodes recommends stencil aperture 0.12 mm thick with 0.15 mm opening for optimal solder paste release.