Diodes Incorporated DDTA144EKA-7-F

Overview

DDTA144EKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with integrated R1 = R2 = 47 kΩ bias resistors, V_CEO = −50 V, I_C(max) = −100 mA, and DC current gain (h_FE) of 68 at −5 V V_CE, −5 mA I_C, used for level-shifting and digital switching in portable power management circuits.

For engineers reviewing the DDTA144EKA-7-F datasheet, DDTA144EKA-7-F pinout, DDTA144EKA-7-F application, or DDTA144EKA-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −1.9 to −3 V), output saturation voltage (V_CE(sat) ≤ −0.3 V at −2 mA), resistor tolerance (±30%), and thermal resistance (625 °C/W on FR4).

Technical Context

This device integrates matched 47 kΩ base-emitter and base-collector resistors to enable single-resistor logic-level interface without external biasing. It operates as a saturated switch with guaranteed turn-on at −1.9 V input and maintains < −0.3 V V_CE(sat) under −2 mA load.

The epitaxial planar construction ensures stable h_FE of 68 across −55 °C to +150 °C, and its SC-59 footprint supports high-density PCB layouts while meeting J-STD-020C Level 1 moisture sensitivity and RoHS-compliant matte tin plating.

Key Specifications

Pinout & Package

Package: SC-59 - surface-mount plastic case (2.7–3.0 mm × 1.5–1.7 mm × 0.35–0.50 mm height), UL 94V-0 rated, 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 DDTA144W-7-F, the DDTA144EKA-7-F offers larger thermal mass and easier rework due to SC-59 pitch; versus NSV144EHT1G, it delivers higher guaranteed h_FE and lower V_IN(on), improving noise immunity in noisy industrial environments.

Availability

DDTA144EKA-7-F is available at Aetrix Electronics and suitable for smartphone power sequencing, USB-C port control, IoT sensor node reset logic, and industrial PLC input conditioning requiring stable component supply and long-term lifecycle support.

Supply support for DDTA144EKA-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 consumer, computing, industrial, and automotive markets.

The DDTA series targets cost-sensitive, high-volume digital interface applications where integration of bias resistors reduces design complexity and improves manufacturing yield.

FAQ

What is the maximum operating temperature for DDTA144EKA-7-F?

The device supports continuous operation from −55 °C to +150 °C junction temperature. Its 625 °C/W thermal resistance on FR4 means ambient temperature must be limited to +85 °C at full 200 mW dissipation, per the derating curve in Figure 1 of DS30341 Rev. 8-2.

Can DDTA144EKA-7-F replace a standard PNP BJT in existing designs?

Yes, but only if the original design uses external base bias resistors totaling ~47 kΩ. The internal R1/R2 network eliminates those resistors, so removing them is mandatory. Layout changes may be needed to accommodate SC-59 pad dimensions versus legacy SOT-23 footprints.

Is the 47 kΩ resistor value exact across units?

No - R1 and R2 each have ±30% tolerance, and their ratio (R2/R1) is specified from 0.8 to 1.2. This variation is accounted for in the guaranteed V_IN(on) and h_FE specs, making the device robust for digital switching despite resistor spread.

Does DDTA144EKA-7-F support PWM switching?

It is not optimized for high-frequency PWM: f_T is 250 MHz (transistor-only, not switch-mode), and typical turn-off time exceeds 100 ns. Use only for DC or low-frequency (<10 kHz) switching; for PWM, consider dedicated MOSFET drivers or faster small-signal transistors.