Diodes Incorporated DDTA124TUA-7-F

Overview

DDTA124TUA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring built-in bias resistors R1 = 22 kΩ and R2 = 47 kΩ (R1 ≠ R2), −50 V V_CEO, −50 mA I_C(max), and DC current gain (h_FE) of −68 at −10 mA/−10 V. It serves as a logic-level interface switch in low-power digital control circuits.

For engineers reviewing the DDTA124TUA-7-F datasheet, DDTA124TUA-7-F pinout, DDTA124TUA-7-F application, or DDTA124TUA-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −1.4 V @ I_O = −2 mA), output saturation voltage (V_O(on) = −0.3 V), resistor tolerance (±30% on R1), resistance ratio tolerance (±20%), and thermal derating behavior up to +150 °C junction temperature.

Technical Context

This device integrates a PNP bipolar transistor with two discrete external-base bias resistors-R1 connected between base and input, R2 between base and emitter-enabling single-resistor logic-level drive without external bias network. Its R1 ≠ R2 topology provides asymmetric input threshold and improved noise immunity over standard resistor-equipped transistors.

Designed for surface-mount logic interfacing, it operates with negative input swing (−1.4 V to −10 V) and delivers clean switching into loads up to −50 mA while maintaining V_CE(sat) ≤ −0.3 V. The SOT-323 package supports high-density PCB layouts and meets J-STD-020C Level 1 moisture sensitivity requirements.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount package (2.0–2.2 mm × 1.15–1.35 mm × 0.25–0.40 mm height), RoHS-compliant, matte tin-plated leads, 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 DDTA124TUA-7-F, DDTA124XUA-7-F offers identical functionality with minor marking variance, while NSV124T1T1G provides higher current capability and lower V_CE(sat) at the cost of larger SOT-23 packaging and different thermal resistance.

Availability

DDTA124TUA-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, consistent parametric performance, and long-term obsolescence management.

Supply support for DDTA124TUA-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, manufacturing, and sales operations across Asia, Europe, and North America.

This part belongs to the DDTA R1≠R2 series of pre-biased PNP transistors, engineered specifically for simplified logic-level interfacing in space- and reliability-critical applications where discrete biasing adds cost and failure risk.

FAQ

What is the maximum continuous collector current for DDTA124TUA-7-F?

The maximum continuous collector current is −50 mA at T_A = 25 °C, derating linearly to zero at 150 °C junction temperature per the 625 °C/W thermal resistance specification. This rating applies under typical PCB mounting conditions with recommended pad layout per AP02001.

Can DDTA124TUA-7-F replace a standard PNP transistor with external base resistors?

Yes-it replaces a discrete PNP transistor plus two external bias resistors (R1 = 22 kΩ, R2 = 47 kΩ) in a single SOT-323 package. No redesign is needed for existing footprints if pinout matches (Emitter–Base–Collector = Pin 1–2–3), and no recalculations of base drive are required due to matched internal resistor values.

Is DDTA124TUA-7-F compliant with automotive AEC-Q101 standards?

No-while it operates across −55 °C to +150 °C and meets JESD22-A108 thermal cycling, it is not AEC-Q101 qualified. For automotive applications, Diodes recommends NSV124T1T1G or DDTA124XUA-7-F with full AEC-Q101 test reports available upon request.

What does the "TUA" suffix indicate in the part number?

"TUA" is Diodes Incorporated's internal type code identifying this specific R1/R2 combination (22 kΩ / 47 kΩ) within the DDTA R1≠R2 series. It is distinct from "XUA", which denotes identical electrical specs but different date-code marking conventions and internal lot traceability protocols.