Diodes Incorporated DDTC143FCA-7-F

Overview

DDTC143FCA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT23 package, featuring integrated bias resistors R1 = 4.7 kΩ and R2 = 22 kΩ (R1 ≠ R2), V_I(OFF) = 0.3 V, V_I(ON) = 1.1 V (at I_O = 3 mA), and I_O(MAX) = 100 mA. It functions as a digital switch or level translator in automotive body control modules, LED driver enable stages, and low-power logic interface circuits.

For engineers reviewing the DDTC143FCA-7-F datasheet, DDTC143FCA-7-F pinout, DDTC143FCA-7-F application, or DDTC143FCA-7-F equivalent, key selection criteria include input threshold voltage, output saturation voltage, resistor ratio tolerance (±20%), DC current gain (G_L = 68 at V_CE = 5 V, I_O = 10 mA), and AEC-Q101 qualification for automotive reliability.

Technical Context

This device integrates two precision bias resistors (R1 = 4.7 kΩ, R2 = 22 kΩ) to configure a single-NPN transistor as a digitally controlled switch with defined turn-on/turn-off thresholds. Its R1 ≠ R2 topology enables asymmetric input hysteresis and stable logic-level interfacing without external components.

Designed for 5 V and 3.3 V logic domains, it delivers V_O(ON) ≤ 0.3 V at I_O/I_L = 3 mA/0.25 mA, supports continuous output current up to 100 mA, and operates across −55 °C to +150 °C with 200 mW power dissipation on FR4 PCB.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, UL 94V-0 flammability rating, and 0.008 g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC143ZCA-7-F and DDTC143XCA-7-F, DDTC143FCA-7-F offers balanced input sensitivity (I_L = 3.6 mA @ 5 V) and mid-range threshold (V_I(ON) = 1.1 V), making it ideal for mixed-voltage 3.3 V/5 V systems requiring stable switching without excessive base current draw.

Availability

DDTC143FCA-7-F is available at Aetrix Electronics and suitable for automotive body electronics, LED driver interfaces, and industrial sensor enable circuits requiring stable component supply, AEC-Q101 traceability, and green manufacturing compliance.

Supply support for DDTC143FCA-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 automotive, industrial, and consumer markets.

The DDTC (R1 ≠ R2 SERIES) CA product line delivers pre-biased transistors optimized for simplified digital switching in space- and cost-constrained designs, with emphasis on AEC-Q101 compliance and green material specifications.

FAQ

What is the maximum continuous collector current for DDTC143FCA-7-F?

The absolute maximum continuous output current is 100 mA, verified per DS30330 Rev. 11–2 Section "Absolute Maximum Ratings." This rating applies at T_A = +25°C with proper PCB thermal relief; derating is required above 25°C ambient per the 625 °C/W R_θJA curve.

Does DDTC143FCA-7-F require external bias resistors?

No. It integrates R1 = 4.7 kΩ and R2 = 22 kΩ internally, forming a complete pre-biased NPN configuration. No external resistors are needed for basic switching operation-only the input signal (Pin 2), load (between Pin 3 and V_CC), and ground (Pin 1) connections are required.

Is DDTC143FCA-7-F qualified for automotive applications?

Yes. It is explicitly AEC-Q101 qualified and marked "AEC-Q101" in ordering information. It meets stress test requirements for temperature cycling, humidity, and mechanical shock, and supports PPAP documentation for Tier 1 automotive suppliers.

What is the input voltage range for reliable switching?

The guaranteed functional input voltage range is −6 V to +30 V, with V_I(OFF) = 0.3 V (max) and V_I(ON) = 1.1 V (typ.) at I_O = 3 mA. Operation outside this range may cause unintended conduction or damage; clamping diodes are not integrated.