Diodes Incorporated DDTB142JU-7-F

Overview

DDTB142JU-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT-323 package, designed for low-power switching and signal amplification with integrated 47 kΩ base-emitter (R2) and 22 kΩ base-collector (R1) biasing resistors. It supports −500 mA output current, −40 V V_CEO, and −0.3 V V_CE(sat) at −50 mA, commonly used in portable LED driver control and logic-level interface circuits.

For engineers reviewing the DDTB142JU-7-F datasheet, DDTB142JU-7-F pinout, DDTB142JU-7-F application, or DDTB142JU-7-F equivalent, key selection criteria include verified R1/R2 resistor values (22 kΩ / 47 kΩ), guaranteed −500 mA I_C capability, confirmed SOT-323 mechanical dimensions (2.1 mm × 1.25 mm × 0.9 mm), and validated −0.3 V saturation voltage under −50 mA load.

Technical Context

This device integrates two on-die resistors to eliminate external bias components: R1 = 22 kΩ between base and collector, R2 = 47 kΩ between base and emitter. It operates as a single-gain-stage PNP switch with fixed DC bias network, enabling direct TTL/CMOS-compatible input drive without external resistors.

Its −40 V BV_CEO, −50 V BVCBO, and −5 V BVEBO ratings define safe operating limits for low-voltage rail applications. Thermal resistance of 625 °C/W (R_JA) on FR4 board constrains continuous power dissipation to 200 mW at 25 °C ambient.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic case (2.1 mm × 1.25 mm × 0.9 mm), UL 94V-0 rated, matte tin-plated terminals, 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 DDTB142JU-7-F, DDTB142TU-7-F lacks R2 and needs external biasing for reliable cutoff, while NSV142JUW3T1G trades 10 V breakdown margin for 20% smaller footprint and improved thermal performance-both require revalidation of input threshold and saturation behavior in final layout.

Availability

DDTB142JU-7-F is available at Aetrix Electronics and suitable for portable LED drivers, logic-level translators, and load-switching circuits requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for DDTB142JU-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 Europe.

The DDTB series targets cost-sensitive, space-constrained applications needing simplified bipolar switching-designed specifically for replacing dual-resistor PNP configurations in consumer, computing, and industrial control boards.

FAQ

What is the function of the internal resistors R1 and R2 in DDTB142JU-7-F?

R1 (22 kΩ) connects base to collector and provides feedback bias for stable active-region operation; R2 (47 kΩ) connects base to emitter and ensures reliable cutoff when input is open or high-impedance. Together they replace two external resistors, enabling direct logic-level drive without additional components.

Can DDTB142JU-7-F be used in linear amplifier mode?

No-it is optimized for switching operation, not linear amplification. Its h_FE is specified only at I_C = −5 mA and −50 mA, and the fixed R1/R2 network prevents stable DC biasing for Class-A operation. Use discrete transistors like BC807 for analog gain stages.

Is the SOT-323 package lead-free and RoHS compliant?

Yes. DDTB142JU-7-F uses matte tin-plated terminals and meets RoHS Directive 2011/65/EU requirements. The "-7-F" suffix explicitly denotes lead-free, halogen-free, and green-compliant packaging per Diodes Incorporated's specification DS30400 Rev. 2.

How does thermal performance change above 25 °C ambient?

Power dissipation must be linearly derated above 25 °C using R_JA = 625 °C/W: maximum allowable P_D = 200 mW − [(T_A − 25) × 0.32 mW/°C]. At 70 °C ambient, max P_D drops to 56 mW, limiting continuous I_C to ~180 mA at −0.3 V V_CE(sat).