Diodes Incorporated DDTA142TU-7-F

Overview

DDTA142TU-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT-323 package, featuring integrated 470 Ω base-emitter resistor (R1) and open-circuit base-collector path (R2), V_CEO = −40 V, I_C = −100 mA, and h_FE = 100–600 at I_C = −1 mA. It serves as a compact, bias-simplified switch in low-voltage logic interface circuits.

For engineers reviewing the DDTA142TU-7-F datasheet, DDTA142TU-7-F pinout, DDTA142TU-7-F application, or DDTA142TU-7-F equivalent, key selection criteria include verified R1/R2 configuration, guaranteed h_FE range at −1 mA, SOT-323 thermal derating curve, V_EBO = −5 V rating, and RoHS-compliant matte tin plating over Alloy 42 leadframe.

Technical Context

This device implements a single PNP bipolar junction transistor with monolithically integrated base biasing network-R1 connected between base and emitter, R2 omitted (open), enabling direct logic-level input drive without external resistors. Its internal structure uses epitaxial planar die construction for stable gain and leakage performance across temperature.

Designed for DC switching rather than linear amplification, it operates with guaranteed V_CE(sat) ≤ −0.3 V at I_C = −5 mA / I_B = −0.25 mA and supports ambient temperatures from −55 °C to +150 °C, with power dissipation derated above 25 °C per the published 200 mW → 0 mW linear curve.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic case (2.00–2.20 mm length, 1.15–1.35 mm width, 0.25–0.40 mm thickness), UL 94V-0 rated, 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 DDTA142TU-7-F, DDTA143EU-7-F trades lower base drive strength for reduced input loading, while NSV14200MT1G offers identical biasing in a thermally more robust but physically larger package-neither is pin-compatible due to differing pin assignments and package outlines.

Availability

DDTA142TU-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, power sequencing control, and low-voltage reset signal generation requiring stable component supply and long-term obsolescence mitigation support.

Supply support for DDTA142TU-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.

This part belongs to the DDTA/DDTC pre-biased transistor family, designed specifically to reduce bill-of-materials count and layout area in digital interface and power-control applications where simplified biasing is critical.

FAQ

Is DDTA142TU-7-F still in active production?

No-Diodes Incorporated has officially discontinued DDTA142TU-7-F, marking it "OBSOLETE – PART DISCONTINUED" in DS30402 Rev. 7 (June 2021). Aetrix Electronics maintains limited legacy stock and supports last-time-buy programs with full traceability and extended lifecycle documentation for qualified industrial customers.

What is the exact pin configuration for DDTA142TU-7-F in SOT-323?

Pin 1 is Emitter, Pin 2 is Base, Pin 3 is Collector-confirmed by the schematic diagram on page 2 of DS30402, showing emitter grounded, base connected to R1, and collector as output node. This matches standard SOT-323 top-marking orientation with marking dot adjacent to Pin 1.

Can DDTA142TU-7-F replace a standard PNP transistor like BC807?

Only with circuit redesign: DDTA142TU-7-F integrates R1 = 470 Ω and omits R2, so it cannot substitute for a bare PNP without removing external base resistors. Its fixed bias network sets specific V_IN thresholds and limits base current to ~−10.6 mA at −5 V input-unlike BC807, which requires full external bias control.

Does DDTA142TU-7-F support 5 V logic input directly?

Yes-its V_I(on) is specified at −2.0 V (typical) with VO = −0.3 V and IO = −20 mA, meaning a −5 V input fully saturates the device. With R1 = 470 Ω, input current is ~−10.6 mA at −5 V, well within its −28 mA absolute maximum rating and compatible with standard 5 V TTL/CMOS outputs.