Diodes Incorporated DDTC143EE-7-F

Overview

DDTC143EE-7-F from Diodes Incorporated is an NPN pre-biased transistor in SOT523 package with integrated bias resistors R1 = R2 = 4.7 kΩ, rated for 50 V V_CC, 100 mA I_O, and 150 mW power dissipation, used in logic-level signal switching and level translation circuits in space-constrained consumer and industrial control modules.

For engineers reviewing the DDTC143EE-7-F datasheet, DDTC143EE-7-F pinout, DDTC143EE-7-F application, or DDTC143EE-7-F equivalent, key selection criteria include input voltage thresholds (V_I(OFF) ≤ 1.1 V, V_I(ON) ≥ 1.9 V), guaranteed output saturation (V_O(ON) ≤ 0.3 V at 20 mA), DC current gain (G_I = 20), and thermal resistance (R_θJA = 833 °C/W) under FR-4 mounting.

Technical Context

This device integrates a monolithic NPN transistor with two matched 4.7 kΩ bias resistors (R1 = R2) to form a single-input, single-output digital switch. It operates as a current-controlled inverter with defined turn-on/turn-off voltage thresholds and fixed base drive ratio.

The SOT523 package enables high-density placement in portable electronics. Its 0.002 g mass and J-STD-020 Level 1 moisture sensitivity support standard reflow assembly without baking. The 833 °C/W thermal resistance requires careful PCB copper area allocation for sustained 100 mA operation.

Key Specifications

Pinout & Package

SOT523 surface-mount package: 1.60 mm × 1.60 mm × 0.75 mm body, matte tin-plated leads, UL 94V-0 molding compound, 0.002 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC123EE-7-F and DDTC114EE-7-F, DDTC143EE-7-F strikes a balance between input drive strength and power efficiency-its 4.7 kΩ bias network delivers sufficient base current for 100 mA loads while limiting VI leakage to 1.8 mA at 5 V, making it optimal for general-purpose 3.3 V logic interfacing.

Availability

DDTC143EE-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and level translation interfaces requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for DDTC143EE-7-F 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-reliability components for industrial, computing, and automotive markets since 1960.

This part belongs to the DDTC (R1 = R2 Series) pre-biased transistor family, designed specifically to reduce bill-of-materials count and PCB area in digital interface and signal conditioning applications where predictable, resistor-stabilized switching behavior is required.

FAQ

What is the maximum continuous collector current for DDTC143EE-7-F?

The absolute maximum continuous output current is 100 mA, verified per DS30313 Rev. 16–2 Section "Absolute Maximum Ratings". This rating assumes operation at TA = +25°C with FR-4 PCB mounting meeting the recommended pad layout; derating applies above +25°C per the published derating curve (150 mW max at ambient).

Does DDTC143EE-7-F require an external base resistor?

No. It integrates two matched 4.7 kΩ bias resistors (R1 = R2) internally, eliminating the need for external base drive components. The device is configured as a single-input inverter: apply voltage to pin 3 (base), sink current from pin 2 (collector), and tie pin 1 (emitter) to ground.

Is DDTC143EE-7-F qualified for automotive use?

It is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, Diodes Incorporated offers qualification support upon customer request for automotive applications requiring change control and reliability validation.

What is the typical transition frequency (f_T) of DDTC143EE-7-F?

The typical transition frequency is 250 MHz, measured at V_CE = −10 V, I_E = 5 mA, and f = 100 MHz (DS30313 Rev. 16–2, Electrical Characteristics table). This value reflects the transistor die's intrinsic speed and supports switching applications up to several tens of MHz with appropriate layout.