Diodes Incorporated DDTA123JKA-7-F

Overview

DDTA123JKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with R1 = 2.2 kΩ and R2 = 47 kΩ, designed for digital switching applications requiring integrated biasing. It supports V_CC = −50 V, I_O = −100 mA, V_I(ON) = −3.0 V at I_O = −20 mA, and exhibits DC current gain (G_L) of −80 at V_CE = −10 V, I_C = −10 mA - used in level-shifting circuits within industrial control I/O modules.

For engineers reviewing the DDTA123JKA-7-F datasheet, DDTA123JKA-7-F pinout, DDTA123JKA-7-F application, or DDTA123JKA-7-F equivalent, key selection criteria include input voltage threshold (−3.0 V), output saturation voltage (−0.3 V), built-in resistor ratio tolerance (±20%), thermal resistance (625 °C/W), and RoHS-compliant SC-59 surface-mount packaging.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with two non-equal on-chip base bias resistors (R1 ≠ R2), enabling direct logic-level interface without external bias components. Its R1–R2 configuration provides fixed current gain control and stable turn-on/turn-off behavior under varying load conditions.

The SC-59 package supports high-density PCB layouts and meets J-STD-020C Level 1 moisture sensitivity. Electrical operation is specified across −55 °C to +150 °C, with f_T = 250 MHz confirming suitability for moderate-speed switching up to ~10 MHz edge rates.

Key Specifications

Pinout & Package

Package: SC-59 - surface-mount plastic package with three terminals, UL 94V-0 rated, 0.008 g mass, and lead-free matte tin plating 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 DDTA123YKA-7-F and DDTA143XKA-7-F, DDTA123JKA-7-F offers balanced input sensitivity (−3.0 V), moderate speed, and optimal R2 value for general-purpose 3.3 V/5 V logic interfacing - making it the default choice for cost-sensitive industrial and consumer switching.

Availability

DDTA123JKA-7-F is available at Aetrix Electronics and suitable for industrial PLC digital outputs, automotive body control modules, consumer appliance power sequencing, and medical diagnostic equipment I/O requiring stable component supply and long-term manufacturability.

Supply support for DDTA123JKA-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.

This part belongs to the DDTA R1≠R2 series of pre-biased transistors, developed specifically to simplify digital interface design in space-constrained, high-reliability applications such as factory automation and automotive electronics.

FAQ

What is the maximum safe operating voltage for DDTA123JKA-7-F?

The absolute maximum collector-emitter voltage (V_CC) is −50 V. Operation beyond this rating risks permanent breakdown. For reliable long-term use, design with ≤ −40 V under worst-case transients and ensure proper PCB layout to minimize inductive kickback from inductive loads.

Can DDTA123JKA-7-F replace a standard PNP transistor like BC807?

Yes, but only when the circuit uses the base resistor network for biasing. Unlike BC807, DDTA123JKA-7-F integrates R1 and R2, so external base resistors must be removed. Pinout differs (Emitter–Collector–Base vs. Emitter–Base–Collector), requiring PCB layout revision.

Is DDTA123JKA-7-F suitable for PWM-driven loads?

Yes - its f_T = 250 MHz and t_ON/t_OFF < 200 ns (typical) support PWM frequencies up to 100 kHz. Ensure gate drive strength matches the −3.0 V V_I(ON) threshold and verify thermal dissipation at full duty cycle using the 625 °C/W R_θJA.

Does DDTA123JKA-7-F require derating at elevated ambient temperatures?

Yes - power dissipation must be linearly derated above 25 °C per the 625 °C/W R_θJA. At 85 °C ambient, max allowable P_D drops to 100 mW. Use the derating curve in Figure 1 of DS30342 Rev. 7–2 to determine safe operating area for your board's thermal environment.