Diodes Incorporated DDTA124GKA-7-F

Overview

DDTA124GKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor with built-in R2 bias resistor (22 kΩ), SC-59 package, −50 V V_CEO, −100 mA I_C, and h_FE = 56 (typ) at −5 mA/−5 V, used in discrete logic-level switching and level-shifting circuits in consumer power management.

For engineers reviewing the DDTA124GKA-7-F datasheet, DDTA124GKA-7-F pinout, DDTA124GKA-7-F application, or DDTA124GKA-7-F equivalent, key selection criteria include verified R2-only bias topology, guaranteed −50 V breakdown ratings, SC-59 thermal derating curve compliance, and h_FE consistency across −5 mA to −10 mA operating range.

Technical Context

This device implements a single-PNP epitaxial planar structure with only R2 (22 kΩ) integrated between base and emitter-no R1-enabling simplified high-side switch control with fixed bias current. It operates within −55 °C to +150 °C junction temperature range and delivers V_CE(sat) ≤ −0.3 V at −10 mA I_C/−0.5 mA I_B.

The SC-59 package provides 625 °C/W R_θJA on FR4 board per recommended layout, and its lead-free matte tin plating meets J-STD-020D Level 1 moisture sensitivity. Electrical behavior is characterized at 25 °C with specified test conditions for BVEBO, ICBO, and f_T = 250 MHz.

Key Specifications

Pinout & Package

Package: SC-59 - surface-mount, 3-terminal molded plastic case (UL 94V-0), 0.008 g weight, lead-free matte tin finish over copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA114GKA-7-F and DDTA144GKA-7-F, DDTA124GKA-7-F offers balanced base resistance and gain for general-purpose 3.3 V/5 V interface use-neither overloading weak drivers nor under-biasing robust ones-making it the default choice for mixed-voltage board designs.

Availability

DDTA124GKA-7-F is available at Aetrix Electronics and suitable for LED driver interfaces, microcontroller GPIO expansion, and power rail sequencing requiring stable component supply with consistent R2 tolerance and thermal performance.

Supply support for DDTA124GKA-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 China, Taiwan, and Malaysia.

This part belongs to the DDTA R2-Only Series-a family of pre-biased PNP transistors engineered for simplified digital interface and level-shifting in space-constrained consumer and industrial PCBs.

FAQ

What is the function of the internal R2 resistor in DDTA124GKA-7-F?

The internal R2 resistor (22 kΩ ±30%) connects the base to the emitter, forming a fixed-current bias path that eliminates the need for an external base resistor. This allows direct connection to logic outputs for on/off control, reduces component count, and ensures repeatable turn-on behavior across temperature and process variation.

Can DDTA124GKA-7-F replace a standard PNP transistor like BC807?

No-it cannot serve as a drop-in replacement for non-pre-biased PNP transistors. Its internal R2 ties the base to emitter, preventing conventional bias network implementation. Use only in designs specifically architected for R2-only pre-biased topology, not in circuits requiring adjustable base current or linear amplification.

Is the SC-59 package compatible with standard pick-and-place equipment?

Yes-the SC-59 package has standardized dimensions (2.70–3.00 mm length, 1.50–1.70 mm width, 0.35–0.50 mm thickness) and lead pitch matching JEDEC MO-203-AB, and is supported by major SMT assembly houses using 0.3 mm nozzle and vision-guided placement with fiducial alignment.

Does DDTA124GKA-7-F support operation above 100 °C ambient?

Yes-its −55 °C to +150 °C operating range permits use in high-temperature environments, but derating is required: maximum power dissipation drops linearly from 200 mW at 25 °C to 0 mW at 150 °C, per the published derating curve in DS30344 Rev. 8.