Diodes Incorporated DDTA123YUA-7

Overview

DDTA123YUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring built-in bias resistors R1 = 2.2 kΩ and R2 = 10 kΩ (R1 ≠ R2), −50 V V_CEO, −100 mA I_C(max), and DC current gain (h_FE) of −33 at −10 mA/−5 V. It functions as a logic-level interface switch in low-power digital control circuits.

For engineers reviewing the DDTA123YUA-7 datasheet, DDTA123YUA-7 pinout, DDTA123YUA-7 application, or DDTA123YUA-7 equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −3.0 V @ −20 mA), output saturation voltage (V_O(on) = −0.1 V), resistor tolerance (±30%), thermal resistance (625 °C/W), and RoHS-compliant green molding compound.

Technical Context

This device integrates a PNP bipolar junction transistor with two discrete on-die biasing resistors-R1 connected between base and input, R2 between base and emitter-enabling single-resistor logic-level drive without external components. Its R1 ≠ R2 topology provides asymmetric turn-on/turn-off behavior optimized for digital switching.

Designed for surface-mount logic interfacing, it operates across −55 °C to +150 °C, supports −50 V supply voltage, delivers −100 mA output current, and exhibits f_T = 250 MHz for high-speed switching applications where gain-bandwidth trade-offs are critical.

Key Specifications

Pinout & Package

SOT-323 plastic surface-mount package (2.20 mm × 1.35 mm × 0.90 mm), lead-free matte tin plating, UL 94V-0 rated, 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 DDTA123YUA-7, DDTA123JUA-7-F trades faster switching for lower base current draw, while DDTC123YKA-7-F enables symmetrical NPN/PNP pair design-critical for balanced driver stages and H-bridge control.

Availability

DDTA123YUA-7 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, consistent parametric performance, and long-term lifecycle support.

Supply support for DDTA123YUA-7 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 industrial, computing, and automotive markets.

The DDTA series targets cost-sensitive, space-constrained digital interface applications, delivering integrated biasing to simplify logic-level translation and reduce PCB complexity in high-volume consumer and industrial electronics.

FAQ

What is the absolute maximum input voltage for DDTA123YUA-7?

The absolute maximum input voltage (V_IN) is +5 V to −12 V per datasheet DS30326 Rev. 7-2, page 1. Exceeding −12 V risks irreversible damage to the internal R1 resistor or base-emitter junction, especially under sustained bias conditions.

Can DDTA123YUA-7 be used in linear amplifier mode?

No-it is not characterized or specified for linear operation. The device is optimized for saturated switching with fixed R1/R2 biasing; its h_FE and V_CE(sat) are only guaranteed in switching conditions, and no small-signal parameters (e.g., r_π, g_m) are provided for analog gain design.

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

At 25 °C ambient, yes-P_D = 200 mW allows −100 mA × |V_CE(sat)| ≈ 10 mW dissipation. However, junction temperature rises rapidly above ambient: ΔT = 625 °C/W × 0.01 W = 6.25 °C, remaining well below 150 °C max. Derating is required above 70 °C ambient.

How does the R1 ≠ R2 configuration affect switching behavior compared to R1 = R2 types?

R1 ≠ R2 creates asymmetric base drive: R1 controls turn-on current, R2 sets turn-off leakage path. This yields faster turn-off (via R2 discharge) and sharper logic thresholds than symmetric biasing-critical for noise-immune digital interfaces in electrically noisy environments like automotive or industrial settings.