Diodes Incorporated DDTA123EUA-7-F

Overview

DDTA123EUA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring integrated bias resistors R1 = R2 = 2.2 kΩ, −50 V V_CEO, −100 mA I_C(max), and DC current gain (G_L) of −20 at −20 mA. It functions as a digital switch or level translator in low-power logic interface circuits.

For engineers reviewing the DDTA123EUA-7-F datasheet, DDTA123EUA-7-F pinout, DDTA123EUA-7-F application, or DDTA123EUA-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −1.9 V typ), output saturation voltage (V_O(on) = −0.1 V typ), resistor tolerance (±30%), thermal resistance (625 °C/W), and SOT-323 mechanical compatibility.

Technical Context

This device integrates two matched 2.2 kΩ bias resistors (R1 = R2) to enable single-resistor-base drive configuration, eliminating external bias components. Its epitaxial planar construction ensures stable gain and leakage performance across −55 °C to +150 °C operating range.

The transistor operates as an inverter with grounded emitter (Pin 2), base driven through R1 (Pin 1), and collector output (Pin 3). Input voltage swing spans −12 V to +10 V, supporting TTL/CMOS-compatible logic-level translation with guaranteed turn-on at −1.9 V and turn-off at −0.5 V.

Key Specifications

Pinout & Package

SOT-323 surface-mount plastic package (2.20 mm × 1.35 mm × 0.90 mm), UL 94V-0 rated, moisture sensitivity Level 1, lead-free/RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP pre-biased transistor applications.

Compared with DDTA123JU-7-F, this part offers identical functionality with updated packaging labeling; versus NSV123EUT1G, it delivers lower saturation voltage and tighter resistor matching-critical for battery-powered and thermally constrained designs.

Availability

DDTA123EUA-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and consumer IoT peripherals requiring stable component supply, consistent SOT-323 form factor, and verified pre-biased switching performance.

Supply support for DDTA123EUA-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 device belongs to the DDTA series of pre-biased transistors designed specifically for reducing component count and improving reliability in digital logic interfacing and low-power switching applications.

FAQ

What is the function of Pin 2 (GND/+) in DDTA123EUA-7-F?

Pin 2 serves as the emitter terminal and is designated GND/+ to indicate its dual-role flexibility: it connects to ground in low-side switch configurations or to a positive rail in high-side arrangements. Internal construction confirms it is electrically isolated from the substrate and directly bonded to the emitter region, supporting bidirectional biasing per application schematic requirements.

Can DDTA123EUA-7-F replace a standard PNP transistor like BC807 in existing designs?

Yes, but only if the base drive circuit is redesigned to remove external bias resistors. DDTA123EUA-7-F integrates R1 and R2, so connecting a conventional base resistor would cause double-biasing and unpredictable switching behavior. Direct replacement requires verifying that the original design's base current matches the internal 2.2 kΩ network's implied drive strength under actual V_IN conditions.

Is the 2.2 kΩ resistor value exact across all units?

No-the datasheet specifies ±30% tolerance for R1, and R2/R1 ratio is 0.8–1.2. Measured units show typical R1 values between 1.54 kΩ and 2.86 kΩ. Designers must verify logic-level compatibility using worst-case thresholds: V_IN(on) min = −3 V and V_IN(off) max = −0.5 V, not nominal −1.9 V, to ensure margin across production lots.

Does DDTA123EUA-7-F support pulsed operation beyond its DC ratings?

Yes-its f_T of 250 MHz confirms suitability for fast digital switching up to ~10 MHz square waves, provided pulse duty cycle and peak current remain within SOA limits. Derating curves show 200 mW power limit applies only at T_A = 25 °C; at 75 °C ambient, max dissipation drops to 120 mW, requiring careful thermal layout for repetitive high-frequency use.