Diodes Incorporated DDTA143XKA-7-F

Overview

DDTA143XKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with built-in bias resistors R1 = 4.7 kΩ and R2 = 10 kΩ, V_CEO = −50 V, I_C(max) = −100 mA, and DC current gain (h_FE) ≥ 30 at I_C = −10 mA, V_CE = −10 V. It functions as a digital switch or level translator in low-power logic interface circuits.

For engineers reviewing the DDTA143XKA-7-F datasheet, DDTA143XKA-7-F pinout, DDTA143XKA-7-F application, or DDTA143XKA-7-F equivalent, key selection criteria include input voltage range (−20 V to +7 V), output saturation voltage (V_CE(sat) ≤ −0.3 V at I_C/I_B = −5 mA/−1.8 mA), thermal resistance (625 °C/W), and RoHS-compliant green molding compound.

Technical Context

This device implements a single PNP bipolar junction transistor with asymmetric integrated base biasing (R1 ≠ R2), enabling direct TTL/CMOS-compatible switching without external resistors. Its internal resistor network provides fixed current gain control and ensures stable turn-on/turn-off thresholds across temperature.

The SC-59 surface-mount package supports high-density PCB layouts and meets J-STD-020C Level 1 moisture sensitivity. Electrical behavior is characterized by V_I(off) ≤ −0.3 V (input cutoff), V_I(on) = −3.0 V (input threshold at I_O = −20 mA), and f_T = 250 MHz for moderate-frequency switching applications.

Key Specifications

Pinout & Package

Package: SC-59 - Surface-mount plastic package (2.7–3.0 mm × 1.5–1.7 mm × 0.35–0.50 mm), UL 94V-0 rated, lead-free matte tin plating, 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 DDTA143ZKA-7-F, DDTA143XKA-7-F offers higher base drive (−1.8 mA vs −0.16 mA) for faster turn-on in moderate-speed logic interfaces; versus DDTC143XKA-7-F, it enables high-side switching with rail-to-rail voltage translation but requires inverted control logic.

Availability

DDTA143XKA-7-F is available at Aetrix Electronics and suitable for logic-level translation, microcontroller GPIO expansion, and load switching applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for DDTA143XKA-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, industry-standard components for power management, signal integrity, and protection.

This part belongs to the DDTA (R1≠R2 Series) KA family of pre-biased transistors, designed specifically for eliminating external bias resistors in digital switching and interface applications across consumer, industrial, and automotive electronics.

FAQ

What is the maximum operating temperature for DDTA143XKA-7-F?

The device operates reliably from −55 °C to +150 °C, with thermal resistance R_θJA = 625 °C/W on FR4 board using Diodes Incorporated's recommended pad layout. Derating begins above 25 °C ambient, reducing power dissipation linearly to zero at 150 °C.

Can DDTA143XKA-7-F replace a standard PNP transistor like BC807?

Yes, but only when the circuit relies on external base resistors. DDTA143XKA-7-F integrates R1 = 4.7 kΩ and R2 = 10 kΩ, so replacing a discrete BC807 requires removing those resistors and verifying that the resulting base current (−1.8 mA at V_IN = −5 V) meets the target h_FE and switching speed requirements.

Is the SC-59 package of DDTA143XKA-7-F compatible with reflow soldering?

Yes - it is qualified for lead-free reflow per J-STD-020C Level 1 (unlimited floor life), with matte tin plating and thermal profile compatibility up to peak temperatures of 260 °C. Recommended soak time and ramp rates follow IPC-J-STD-020 guidelines for small-outline transistors.

What does the "X" in DDTA143XKA denote?

The "X" is Diodes Incorporated's type code identifying this specific R1/R2 combination: R1 = 4.7 kΩ and R2 = 10 kΩ. It distinguishes DDTA143XKA from other variants like DDTA143FKA (R1 = 4.7 kΩ, R2 = 22 kΩ) or DDTA143ZKA (R1 = 4.7 kΩ, R2 = 47 kΩ), ensuring correct bias network selection per application needs.