Diodes Incorporated DDTA143EKA-7-F

Overview

DDTA143EKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with integrated R1 = R2 = 4.7 kΩ bias resistors, −50 V V_CEO, −100 mA I_C(max), and 200 mW P_D, used for level-shifting and digital switching in compact logic interface circuits.

For engineers reviewing the DDTA143EKA-7-F datasheet, DDTA143EKA-7-F pinout, DDTA143EKA-7-F application, or DDTA143EKA-7-F equivalent, key selection criteria include verified input voltage thresholds (V_IN(on) = −1.9 V typ), output saturation voltage (V_CE(sat) = −0.1 V typ at I_C/I_B = −10 mA/−0.5 mA), DC current gain (h_FE = 20 min), and thermal resistance (R_θJA = 625 °C/W).

Technical Context

This device integrates matched base-emitter and base-collector bias resistors (R1 = R2 = 4.7 kΩ ±30%) to enable single-resistor logic-level interfacing without external components. It operates as an inverter with grounded emitter configuration and supports rail-to-rail input swing from +10 V to −30 V.

Its epitaxial planar construction delivers f_T = 250 MHz and low output capacitance (C_OB ≈ 12 pF at V_R = 5 V), making it suitable for medium-speed digital switching up to ~10 MHz while maintaining stable DC gain (h_FE ≥ 20 at I_C = −20 mA, V_CE = −5 V).

Key Specifications

Pinout & Package

Package: SC-59 surface-mount plastic package (3.0 mm × 1.7 mm × 0.95 mm), UL 94V-0 rated, lead-free, 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 DDTA143EKA-7-F, DDTA143ZCA-7-F trades thermal performance for size, while NSV143EWT1G improves voltage headroom and efficiency at the cost of Diodes Inc. supply chain alignment.

Availability

DDTA143EKA-7-F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and consumer appliance control boards requiring stable component supply and long-term manufacturing continuity.

Supply support for DDTA143EKA-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, serving industrial, computing, communications, and consumer markets.

This part belongs to the DDTA R1=R2 series of pre-biased transistors, designed specifically to simplify digital logic interfacing and replace discrete transistor-resistor combinations in space-constrained applications.

FAQ

What is the maximum allowable input voltage for DDTA143EKA-7-F?

The absolute maximum input voltage (V_IN) is specified as +10 V to −30 V at T_A = 25°C. This range ensures safe operation when interfacing with 3.3 V, 5 V, or 12 V logic families, including transient overvoltage conditions typical in automotive and industrial environments.

Can DDTA143EKA-7-F be used in linear amplifier configurations?

No - this device is optimized for digital switching, not analog amplification. Its integrated bias resistors fix the operating point, and its h_FE variation (20–100) and lack of linearity specifications make it unsuitable for linear gain stages. Use standard PNP transistors like BC807 for amplification.

Is the SC-59 package pin-compatible with SOT-23?

No - SC-59 has a 3-pin layout identical to SOT-23 mechanically, but the pin assignment differs: SC-59 uses E-B-C (Emitter-Base-Collector) order, whereas standard SOT-23 PNP devices use C-B-E. Direct substitution without PCB redesign will cause functional failure.

What is the typical input current at −5 V applied to pin 2?

At V_IN = −5 V, the input current (I_L) is −1.8 mA (typical), calculated from the internal R1–R2 network (4.7 kΩ each). This value is confirmed in the Electrical Characteristics table and defines required drive strength from upstream logic gates.