Diodes Incorporated DDTB143EU-7-F

Overview

DDTB143EU-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT323 package, featuring integrated 4.7kΩ base-emitter and base-collector bias resistors. It delivers V_CEO = −40V, I_C = −500mA max, V_CE(sat) = −0.3V at I_C/I_B = −50mA/−2.5mA, and DC current gain (h_FE) of 100–600, used for level-shifting and digital switching in low-power logic interfaces.

For engineers reviewing the DDTB143EU-7-F datasheet, DDTB143EU-7-F pinout, DDTB143EU-7-F application, or DDTB143EU-7-F equivalent, key selection criteria include guaranteed V_l(on) ≤ −3.0V at I_O = −20mA, R₁/R₂ = 4.7kΩ/4.7kΩ matching, SOT323 thermal resistance (R_θJA = 625°C/W), and AEC-Q101 readiness for automotive signal conditioning.

Technical Context

This device integrates two matched 4.7kΩ resistors to configure a single-PNP transistor with fixed base biasing-eliminating external resistor placement while ensuring consistent turn-on threshold and saturation behavior across temperature. Its V_l(on) = −3.0V (typ) and V_l(off) = −0.5V (max) define sharp digital input switching boundaries under −5V supply conditions.

The SOT323 package enables high-density PCB layout with 0.006g mass and J-STD-020 Level 1 moisture sensitivity. With f_T = 200MHz and BVCBO = −50V, it supports moderate-speed switching up to ~10MHz in buffered gate drive or IO expansion circuits without oscillation risk.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small surface-mount plastic case (2.15mm × 2.10mm × 0.95mm), UL 94V-0 rated, matte tin-plated leads, moisture sensitivity Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTB123EU-7-F and DDTB114EU-7-F, DDTB143EU-7-F strikes a balanced trade-off: its 4.7kΩ bias network delivers optimal combination of input current (−1.8mA), switching speed, and noise immunity for general-purpose logic interfacing across industrial and automotive domains.

Availability

DDTB143EU-7-F is available at Aetrix Electronics and suitable for IO expansion interfaces, automotive door module control, and industrial sensor signal conditioning requiring stable component supply and long-term production continuity.

Supply support for DDTB143EU-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, manufacturing, and sales operations across Asia, Europe, and North America.

The DDTB series belongs to Diodes' pre-biased transistor product line, engineered specifically for space-constrained digital interface applications where reliability, consistency, and simplified bill-of-materials are critical.

FAQ

What is the maximum allowable continuous collector current for DDTB143EU-7-F?

The absolute maximum continuous collector current is −500mA, as specified in the Absolute Maximum Ratings table. However, practical operation is limited by power dissipation: at 200mW PD and R_θJA = 625°C/W, sustained current should remain below −200mA in still-air conditions to avoid exceeding T_J = +150°C.

Does DDTB143EU-7-F require external bias resistors?

No. DDTB143EU-7-F integrates matched 4.7kΩ base-emitter (R₂) and base-collector (R₁) resistors. This eliminates the need for external bias components, simplifying PCB layout and improving consistency across production units and temperature ranges.

Is DDTB143EU-7-F qualified for automotive applications?

Yes. While not pre-qualified to AEC-Q101 out-of-box, Diodes states this part is manufactured in IATF 16949-certified facilities and supports PPAP documentation. Customers requiring formal qualification can initiate change control processes through Diodes' automotive team for specific application validation.

What is the typical input current when driven with −5V at the base terminal?

At V_I = −5V, the typical input current (I_L) is −1.8mA, as measured across the internal 4.7kΩ R₁ resistor. This value is confirmed in the Electrical Characteristics table under "Input Current" for DDTB143EU, with test condition VI = −5V.