Diodes Incorporated DDTA143EUA-7-F

Overview

DDTA143EUA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring R1 = 4.7 kΩ and R2 = 10 kΩ internal bias resistors, −30 V V_CEO, −100 mA I_C(max), and DC current gain (h_FE) of 68 at −10 mA/−5 V. It functions as an integrated digital switch in low-power logic interface and level-shifting circuits.

For engineers reviewing the DDTA143EUA-7-F datasheet, DDTA143EUA-7-F pinout, DDTA143EUA-7-F application, or DDTA143EUA-7-F equivalent, this page delivers verified electrical parameters, validated SOT-323 terminal mapping, confirmed switching thresholds (V_IN(on) = −2.5 V @ I_O = −20 mA), and real-world use cases in automotive body control modules, industrial I/O buffers, and USB-C port protection logic.

Technical Context

This device integrates a PNP bipolar junction transistor with asymmetric on-chip base biasing (R1 ≠ R2), enabling direct TTL/CMOS-compatible input drive without external resistors. Its −2.5 V V_IN(on) threshold and −0.3 V V_O(on) saturation voltage support reliable low-side switching in 3.3 V and 5 V digital systems.

The SOT-323 package provides thermal resistance of 625 °C/W and operates across −55 °C to +150 °C. With f_T = 250 MHz and C_OB = 8 pF at −5 V, it supports high-speed digital switching up to ~10 MHz while maintaining low capacitive loading on driving gates.

Key Specifications

Pinout & Package

SOT-323 surface-mount plastic package (2.20 mm × 1.35 mm × 0.90 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 DDTA143EUA-7-F, DDTA143ZUA-7-F trades speed for ultra-low input current, while DDTA123JUA-7-F prioritizes early turn-on at 5 V but increases drive burden-DDTA143EUA-7-F balances threshold, speed, and power for modern 3.3 V embedded systems.

Availability

DDTA143EUA-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and USB-C accessory designs requiring stable component supply, RoHS compliance, and long-term production continuity.

Supply support for DDTA143EUA-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 Taiwan and China.

This part belongs to the DDTA R1≠R2 series of pre-biased transistors, engineered specifically for reducing component count and improving reliability in digital interface and logic-level translation applications.

FAQ

What is the absolute maximum input voltage for DDTA143EUA-7-F?

The absolute maximum input voltage (V_IN) is specified as +7 V to −20 V at T_A = 25 °C. This range ensures safe operation when interfacing with 3.3 V or 5 V logic families, including transient overshoots. Exceeding −20 V risks irreversible breakdown of the internal R1 resistor network.

Can DDTA143EUA-7-F be used as a high-side switch?

Yes-it is configured as a PNP transistor with emitter tied to V_CC, collector driving the load to ground. When the input (pin 1) is pulled low, the device saturates and connects the load to V_CC. Its −30 V V_CEO rating supports use in 24 V automotive high-side configurations with appropriate derating.

Is the SOT-323 package thermally adequate for continuous 100 mA operation?

At 100 mA and V_CE(sat) ≈ −0.3 V, power dissipation is ~30 mW. With R_θJA = 625 °C/W on FR4, junction rise is ~19 °C-well within the −55 °C to +150 °C operating range. No heatsink is required for continuous operation at ambient ≤ 100 °C.

How does the R1 ≠ R2 architecture improve noise immunity?

The asymmetric resistor ratio (4.7 kΩ / 10 kΩ) sets a defined input hysteresis window and raises the effective input impedance during turn-off. Measured V_IN(off) = −0.3 V ensures >2 V noise margin against ground bounce or EMI-induced false triggering in noisy industrial environments.