Diodes Incorporated ADTC143ZCAQ-7

Overview

ADTC143ZCAQ-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT23 package, featuring integrated 4.7 kΩ and 47 kΩ bias resistors, AEC-Q101 qualification for automotive use, 50 V V_CC, and 100 mA I_O. It functions as a digital switch or level translator in low-power control circuits such as LED drivers and microcontroller I/O interface stages.

For engineers reviewing the ADTC143ZCAQ-7 datasheet, ADTC143ZCAQ-7 pinout, ADTC143ZCAQ-7 application, or ADTC143ZCAQ-7 equivalent, key selection criteria include input threshold voltage (V_I(OFF) ≤ 0.5 V, V_I(ON) ≥ 1.3 V), guaranteed saturation voltage (V_CE(SAT) ≤ 0.3 V at I_O/I_IN = 5 mA/0.25 mA), resistor tolerance (±30% R₁, ±20% R₂/R₁), and AEC-Q101 compliance for automotive-grade reliability.

Technical Context

This device integrates two precision bias resistors (R₁ = 4.7 kΩ, R₂ = 47 kΩ) directly on-die to configure a single-transistor inverter with fixed current gain and predictable switching thresholds. Its internal topology eliminates external base-resistor layout, reducing PCB footprint and improving consistency in high-volume automotive signal conditioning.

The transistor operates as a saturated switch under DC conditions with guaranteed V_CE(SAT) ≤ 0.3 V at I_O = 5 mA and I_IN = 0.25 mA, while maintaining f_T = 250 MHz for moderate-speed digital transitions. Thermal derating follows a defined 403 °C/W R_θJA on minimum-copper FR-4, supporting continuous operation up to +125 °C ambient when power dissipation remains below 310 mW.

Key Specifications

Pinout & Package

SOT23 surface-mount plastic package (JEDEC TO-236AB), 3-pin configuration with gull-wing leads, 0.008 g mass, UL 94V-0 flammability rating, and moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSV143ZMXV6T1G and DTC143ZCA-7-F, ADTC143ZCAQ-7 uniquely combines AEC-Q101 qualification, halogen/antimony-free construction, and guaranteed switching thresholds-making it the only option qualified for safety-critical automotive signal switching without design revalidation.

Availability

ADTC143ZCAQ-7 is available at Aetrix Electronics and suitable for automotive LED lighting control, microcontroller I/O expansion, and industrial sensor interface applications requiring stable component supply and long-term lifecycle support.

Supply support for ADTC143ZCAQ-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, specializing in high-reliability components for automotive, industrial, and computing markets.

The ADTC143ZCAQ belongs to Diodes' Automotive-Grade Pre-Biased Transistor product line, designed specifically to replace discrete resistor-transistor combinations in space-constrained, thermally demanding automotive signal-path applications.

FAQ

What is the maximum continuous collector current for ADTC143ZCAQ-7?

The absolute maximum rated output current is 100 mA, verified under DC conditions with V_CE ≤ 0.3 V and thermal derating applied per the 403 °C/W R_θJA curve. At 25 °C ambient on minimum-copper FR-4, full 100 mA is sustainable only if power dissipation remains ≤ 310 mW; above 85 °C ambient, current must be reduced to maintain safe junction temperature.

Can ADTC143ZCAQ-7 be used with 1.8 V logic inputs?

Yes-its guaranteed V_I(ON) ≤ 1.3 V ensures reliable turn-on with 1.8 V GPIO outputs, even under worst-case process and temperature conditions. The internal bias network provides sufficient base current to achieve I_O = 5 mA with I_IN = 0.25 mA, making it compatible with modern low-voltage microcontrollers without external level-shifting.

Is the SOT23 package lead-free and RoHS compliant?

Yes-ADTC143ZCAQ-7 is fully lead-free and RoHS 2 compliant (2011/65/EU), with matte tin-plated leads solderable per MIL-STD-202, Method 208. It also meets Diodes Incorporated's "Green" definition: <900 ppm bromine, <900 ppm chlorine, and <1000 ppm antimony, verified per internal material testing protocols.

How does the built-in resistor tolerance affect circuit performance?

R₁ tolerance is ±30%, and R₂/R₁ ratio tolerance is ±20%. This impacts base current and thus saturation margin-but the datasheet guarantees V_CE(SAT) ≤ 0.3 V and h_FE ≥ 80 under worst-case resistor combinations, ensuring functional reliability without design iteration for most digital switching applications.