Diodes Incorporated DDTB123YU-7-F

Overview

DDTB123YU-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT323 package, featuring integrated 2.2 kΩ and 10 kΩ biasing resistors, −50 V collector-base breakdown voltage, −40 V collector-emitter breakdown voltage, and DC current gain (h_FE) of 56 at −5 mA / −5 V. It operates across −55 °C to +150 °C and delivers −0.3 V saturation voltage at −50 mA collector current, suited for discrete logic-level switching in automotive body control modules.

For engineers reviewing the DDTB123YU-7-F datasheet, DDTB123YU-7-F pinout, DDTB123YU-7-F application, or DDTB123YU-7-F equivalent, key selection criteria include verified R1/R2 resistor values (2.2 kΩ / 10 kΩ), guaranteed V_CEO and V_CBO ratings, confirmed SOT323 thermal resistance (625 °C/W), and documented I_C(off) leakage (< −0.5 µA at −50 V).

Technical Context

This device implements a monolithic PNP bipolar junction transistor with two on-die base bias resistors-R1 connected between base and emitter, R2 between base and collector-enabling single-resistor drive interface and eliminating external bias network requirements. Its −0.3 V V_CE(sat) at −50 mA ensures low conduction loss in high-side switch configurations.

The SOT323 package provides 200 mW power dissipation capability with 625 °C/W junction-to-ambient thermal resistance when mounted on FR4 PCB using minimum recommended pad layout. Absolute maximum input voltage range is −12 V to +5 V, validated under specified test conditions per DS30383 Rev. 7-2.

Key Specifications

Pinout & Package

Package: SOT323 - surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, weight ≈ 0.006 g, UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTB123EU-7-F and DDTB133HU-7-F, DDTB123YU-7-F offers asymmetric R1/R2 (2.2 kΩ / 10 kΩ) that lowers base current demand while maintaining −2.0 V V_I(on), making it optimal for low-power microcontroller GPIO drive in space-constrained automotive modules.

Availability

DDTB123YU-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and consumer appliance control boards requiring stable component supply and long-term obsolescence management.

Supply support for DDTB123YU-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.

The DDTB series targets cost-sensitive, high-reliability discrete switching applications in automotive and industrial markets, emphasizing integrated biasing, AEC-Q101 readiness, and standardized SOT323 packaging for automated assembly.

FAQ

Is DDTB123YU-7-F qualified to AEC-Q101?

No, DDTB123YU-7-F is not formally AEC-Q101 qualified per its ordering information status ("Obsolete Standard"). However, it is manufactured in IATF 16949 certified facilities and supports PPAP documentation upon request. For production automotive applications, Diodes recommends contacting their local representative to discuss qualification pathways or alternate AEC-Q101-compliant variants such as the DDTA series.

What is the meaning of "Y" in the marking code P66?

The "Y" in P66 refers to the product type marking code assigned to the DDTB123YU variant per Diodes' internal part numbering system. It distinguishes this specific R1/R2 combination (2.2 kΩ / 10 kΩ) from other members of the DDTB family, such as P61 for DDTB123EU or P67 for DDTB133HU. This code appears on the top-side laser marking of each unit.

Can DDTB123YU-7-F replace a standard PNP transistor like MMBT3906?

Yes, but only when the circuit uses the built-in bias network. Unlike the MMBT3906-which requires two external base resistors-DDTB123YU-7-F integrates R1 (2.2 kΩ) and R2 (10 kΩ), so direct substitution requires removing those external components. Its −0.3 V V_CE(sat) and 56 h_FE match typical MMBT3906 performance, but input voltage thresholds differ (−2.0 V vs −0.7 V), affecting logic compatibility.

What is the thermal derating behavior above 25°C ambient?

Derating follows the 625 °C/W R_θJA value: power dissipation must be reduced by 0.32 mW/°C above +25°C ambient. At +85°C ambient, maximum allowable P_D drops to 128 mW. This assumes mounting on FR4 with minimum recommended pad layout per DS30383; enhanced copper pour or thermal vias improve performance beyond this baseline.