Diodes Incorporated DDTA124TKA-7-F

Overview

DDTA124TKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor with integrated 22 kΩ base bias resistor (R1 only), SC-59 package, −50 V V_CEO, −100 mA I_C, and h_FE of 100–600 at −1 mA/−5 V; used in discrete logic-level switching and signal inversion circuits in consumer power management.

For engineers reviewing the DDTA124TKA-7-F datasheet, DDTA124TKA-7-F pinout, DDTA124TKA-7-F application, or DDTA124TKA-7-F equivalent, key selection criteria include verified R1-only bias topology, guaranteed V_CE(sat) ≤ −0.3 V at −2.5 mA/−0.25 mA drive, SC-59 thermal resistance (625 °C/W), and RoHS-compliant green molding compound compliance.

Technical Context

This device implements a single-PNP transistor with monolithically integrated base-emitter pull-up resistor (R1 = 22 kΩ ±30%), eliminating external bias components for digital interface applications. It operates in active and saturation regions with guaranteed breakdown ratings: V_CBO = −50 V, V_EBO = −5 V, and T_j range of −55 °C to +150 °C.

The R1-only architecture simplifies PCB layout for level-shifting and open-collector driver functions. Its f_T of 250 MHz (at V_CE = −10 V, I_E = 5 mA) supports moderate-speed switching up to ~10 MHz, while V_CE(sat) specification ensures low conduction loss in load-switching roles.

Key Specifications

Pinout & Package

Package: SC-59 - Surface-mount plastic package with 3-pin configuration, UL 94V-0 flammability rating, moisture sensitivity level 1, and matte tin-plated copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA124TKA-7-F, DDTA124TK-7-F lacks green compound compliance and NSVDDTA124TXZT6G adds AEC-Q101 qualification and tighter R1 tolerance-making the latter suitable for automotive, while the former serves cost-sensitive industrial uses where RoHS is not mandated.

Availability

DDTA124TKA-7-F is available at Aetrix Electronics and suitable for smartphone power sequencing, USB over-current protection, and industrial PLC input modules requiring stable component supply and full RoHS compliance.

Supply support for DDTA124TKA-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, specializing in high-reliability, energy-efficient components for power management, signal integrity, and protection applications.

The DDTA (R1-only series) product line delivers pre-biased PNP transistors optimized for simplified digital interface design in consumer, computing, and industrial systems where board space and BOM reduction are critical.

FAQ

What is the function of the "A" suffix in DDTA124TKA-7-F?

The "A" suffix denotes Diodes Incorporated's "Green" manufacturing standard: devices with this suffix use halogen-free, antimony-free molding compound and comply with RoHS Directive 2011/65/EU. Units without "A" (e.g., DDTA124TK-7-F) were produced prior to Date Code 0627 and contain legacy flame retardants.

Can DDTA124TKA-7-F replace a standard PNP transistor like BC807-25?

No-it cannot serve as a drop-in replacement because it integrates only R1 (22 kΩ), lacking the R2 emitter-base resistor found in dual-resistor types. BC807-25 requires external biasing; DDTA124TKA-7-F is designed for direct logic-level drive, so substitution would require circuit redesign to remove external resistors and verify saturation under target I_C/I_B conditions.

What is the maximum operating frequency for switching applications?

The device's f_T is specified at 250 MHz under V_CE = −10 V and I_E = 5 mA, but practical switching speed is limited by stored charge and package parasitics. For reliable digital switching, it is validated up to 10 MHz with <100 ns t_ON/t_OFF at I_C = −10 mA, per typical curves in DS30343 Rev. 7-2.

Is thermal derating required above 25°C ambient?

Yes-power dissipation must be linearly derated above 25°C using R_θJA = 625 °C/W. At 75°C ambient, maximum allowable P_D drops to 100 mW. Derating follows the curve in Figure 1 of DS30343 Rev. 7-2, assuming FR4 board with Diodes' recommended pad layout (AP02001).