Diodes Incorporated DDTB143EC-7-F

Overview

DDTB143EC-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT23 package, featuring integrated 4.7kΩ base-emitter and base-collector bias resistors. It delivers -500mA output current, -0.3V saturation voltage at -50mA/-2.5mA, and DC current gain (G_I) of 47, optimized for digital switching in low-voltage logic interfaces and level-shifting circuits.

For engineers reviewing the DDTB143EC-7-F datasheet, DDTB143EC-7-F pinout, DDTB143EC-7-F application, or DDTB143EC-7-F equivalent, key selection criteria include verified V_IN(on) = -3.0V at I_O = -20mA, R₁/R₂ = 4.7kΩ/4.7kΩ matching, SOT23 thermal resistance (625°C/W), and AEC-Q101 suitability for automotive signal conditioning.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with on-die 4.7kΩ pull-up and pull-down resistors, eliminating external bias components. Its -50V V_CBO, -40V V_CEO, and -0.5μA I_O(off) at V_CC = -50V support robust off-state isolation in negative-rail control paths.

The -0.3V V_CE(sat) at I_C = -50mA/I_B = -2.5mA enables low-loss switching in 3.3V/5V logic-driven loads, while f_T = 200MHz allows stable operation up to high-frequency digital edge rates without oscillation.

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic package (2.9mm × 1.3mm × 1.0mm), RoHS-compliant, moisture sensitivity level 1, weight 0.008g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTB123EC-7-F and DDTB113ZC-7-F, DDTB143EC-7-F offers balanced bias for general-purpose logic-level translation, delivering optimal trade-off between input sensitivity, saturation loss, and thermal margin in space-constrained designs.

Availability

DDTB143EC-7-F is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC input conditioning, and medical infusion pump motor enable circuits requiring stable component supply and long-term lifecycle support.

Supply support for DDTB143EC-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in IATF 16949-certified facilities.

The DDTB series targets cost-sensitive, high-volume digital switching applications, emphasizing reduced BOM count, AEC-Q101 readiness, and green packaging compliance for automotive and industrial markets.

FAQ

What is the maximum operating temperature for DDTB143EC-7-F?

The device operates reliably from -55°C to +150°C ambient temperature. Its 625°C/W thermal resistance assumes mounting on FR4 with minimum recommended pad layout; derating is required above +125°C case temperature to maintain 200mW power limit.

Can DDTB143EC-7-F replace a standard PNP BJT without external resistors?

Yes - it integrates 4.7kΩ base-emitter and base-collector resistors, enabling direct replacement of discrete PNP transistors plus two bias resistors. No external components are needed for basic switching, though RC snubbers may still be required for inductive loads.

Is DDTB143EC-7-F qualified for automotive applications?

While not pre-qualified to AEC-Q101, it is manufactured in IATF 16949-certified facilities and supports PPAP documentation. Customers requiring formal qualification should contact Diodes Incorporated for change-controlled automotive-grade variants.

What does the "-7-F" suffix indicate in the part number?

The "-7-F" denotes tape-and-reel packaging: 7-inch reel, 8mm tape width, 3,000 units per reel. The "F" confirms full RoHS 3 compliance and green compound usage per Diodes' definitions (Br+Cl <1500ppm, Sb <1000ppm).