Diodes Incorporated DMP2123LQ-13

Overview

DMP2123LQ from Diodes Incorporated is a P-channel enhancement-mode MOSFET in SOT23 package, rated for -20 V V_DSS, -3.0 A continuous drain current at 25°C, and 72 mΩ R_DS(ON) at V_GS = -4.5 V. It serves as a low-side load switch or reverse-polarity protection device in compact DC power rails for automotive body electronics and industrial control modules.

For engineers reviewing the DMP2123LQ datasheet, DMP2123LQ pinout, DMP2123LQ application, or DMP2123LQ equivalent, key selection criteria include its AEC-Q101 qualification, low gate threshold (-0.6 to -1.25 V), tight R_DS(ON) tolerance across V_GS levels, and SOT23 thermal performance under pulsed and steady-state loads.

Technical Context

This MOSFET operates in enhancement mode with negative gate drive, requiring V_GS ≤ -0.6 V to initiate conduction and fully turning on at V_GS = -4.5 V. Its body diode supports reverse-current blocking and freewheeling in buck or OR-ing configurations.

The device features low dynamic parameters: Q_g = 7.3 nC, C_iss = 443 pF, and fast switching (t_F = 41 ns), enabling efficient operation in 100–500 kHz DC-DC secondary-side synchronous rectification and low-power load switching.

Key Specifications

Pinout & Package

SOT23 package: 3-pin surface-mount plastic case, 2.9 mm × 1.35 mm footprint, 1.0 mm height, matte tin-plated copper leadframe, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel MOSFET switching applications.

Compared with DMG2305U-7 and AO3401, DMP2123LQ delivers balanced trade-offs: AEC-Q101 compliance for automotive use, tighter V_GS(TH) distribution for predictable turn-on with 3.3 V logic, and optimized Q_g/C_iss ratio for clean PWM edge integrity in space-constrained layouts.

Availability

DMP2123LQ-13 is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC output stages, USB-C power delivery ports, and smart lighting drivers requiring stable component supply and long-lifecycle support.

Supply support for DMP2123LQ-13 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.

The DMP2123LQ belongs to Diodes' AEC-Q101-qualified small-signal MOSFET product line, engineered specifically for robust, low-footprint power switching in automotive body electronics and industrial control systems.

FAQ

What is the maximum safe operating temperature for DMP2123LQ in continuous conduction?

The junction temperature must not exceed +150°C. With R_θJA = 90°C/W and ambient at +70°C, maximum continuous power dissipation is 0.89 W, limiting I_D to ~2.4 A at R_DS(ON) = 72 mΩ. Derating curves in Figure 6 confirm this limit holds up to +100°C ambient when board layout enhances heat spreading.

Can DMP2123LQ be driven directly by a 3.3 V microcontroller GPIO?

Yes - its V_GS(TH) range (-0.6 to -1.25 V) ensures full enhancement at V_GS = -3.3 V. With 72 mΩ R_DS(ON) at -4.5 V and 108 mΩ at -2.7 V, it delivers usable conduction even with 2.7 V logic, though optimal performance requires ≥-3.0 V gate drive referenced to source.

Does DMP2123LQ include integrated ESD protection?

No - the datasheet does not specify on-chip ESD structures. External TVS diodes or series resistors are recommended for gate protection in environments with >2 kV HBM exposure risk. The device's low input leakage (<100 nA) confirms absence of internal clamping networks that would increase standby current.

How does the body diode performance compare to discrete Schottky alternatives?

V_SD = -0.79 V at -1.7 A is higher than typical Schottky diodes (~0.3–0.45 V), resulting in ~0.4 V higher forward drop. However, integration eliminates board area and parasitic inductance, making it preferable in compact OR-ing and reverse-polarity circuits where moderate conduction loss is acceptable for layout simplicity.