Diodes Incorporated DCX143EH-7

Overview

DCX143EH-7 from Diodes Incorporated is a complementary NPN/PNP pre-biased small-signal transistor pair in SOT563 package, featuring integrated 4.7kΩ and 4.7kΩ bias resistors (R1 = R2 = 4.7kΩ), ±50V V_CEO, ±100mA I_O, and 150mW total power dissipation. It serves as a compact logic-level interface driver for dual-polarity switching in space-constrained digital control circuits.

For engineers reviewing the DCX143EH-7 datasheet, DCX143EH-7 pinout, DCX143EH-7 application, or DCX143EH-7 equivalent, key selection criteria include verified input voltage thresholds (V_I(ON) = ±1.9V at I_O = 5mA), output saturation voltage (V_O(ON) = ±0.3V), DC current gain (G_L = 20), and thermal derating behavior up to +150°C ambient.

Technical Context

This device integrates matched NPN and PNP transistors with identical on-chip base-emitter bias resistors (4.7kΩ each), enabling symmetrical high-side and low-side switching without external resistor networks. Its dual-rail input compatibility (±10V to ±30V VIN range) supports bidirectional level translation between 3.3V/5V logic and higher-voltage loads.

The SOT563 package provides six terminals with internal connection of emitter-collector paths and discrete resistor terminations - confirmed by mechanical diagram and marking code C08. Thermal resistance (R_θJA = 833°C/W) is specified for FR-4 board mounting per J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

SOT563 is a 6-pin ultra-small surface-mount package (1.6mm × 1.2mm × 0.5mm) with gull-wing leads, matte tin-plated copper leadframe, and green halogen-free molding compound rated UL 94V-0.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar complementary pre-biased transistor applications.

Compared with DCX143TH-7, DCX143EH-7 delivers full complementary operation essential for push-pull topologies; versus NSBC114EPDXV6T1G, it offers cost-optimized industrial performance without automotive qualification overhead.

Availability

DCX143EH-7 is available at Aetrix Electronics and suitable for LED indicator interfaces, microcontroller GPIO expansion, relay coil driving, and push-pull signal inversion requiring stable component supply and consistent parametric performance across production batches.

Supply support for DCX143EH-7 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 and manufacturing operations across Asia and the Americas.

This part belongs to the DCX-series complementary pre-biased transistor family, engineered specifically for reducing component count and PCB area in digital interface and switching applications where space and BOM simplicity are critical.

FAQ

What is the maximum recommended operating voltage for DCX143EH-7?

The device supports ±50V collector-emitter voltage (V_CEO) and ±30V input voltage (V_IN) for the NPN/PPN sections respectively. Exceeding these ratings risks permanent breakdown; sustained operation above ±40V requires derating per the datasheet's thermal curve and board layout optimization.

Can DCX143EH-7 be used in AC-coupled signal amplification?

No - this is a digitally optimized pre-biased switching transistor, not a linear amplifier. Its fixed bias network and saturation-focused design yield poor linearity and undefined small-signal parameters like f_T for the DCX143EH variant; use dedicated RF or general-purpose transistors for amplification.

How does the 4.7kΩ/4.7kΩ resistor ratio affect logic compatibility?

The matched R1/R2 values ensure symmetric input current draw (~0.36mA at 5V), enabling clean toggle between NPN and PNP states using standard CMOS outputs. This eliminates duty-cycle distortion in push-pull waveforms and guarantees consistent V_I(ON) = ±1.9V across temperature.

Is DCX143EH-7 suitable for PWM motor control?

It supports PWM frequencies up to ~100kHz for small DC motors (<1W), given its V_CE(SAT) ≤ 0.3V and thermal limit of 150mW. For higher-power or higher-frequency applications, dedicated H-bridge drivers or MOSFET-based solutions are recommended to avoid thermal overload.