Diodes Incorporated DDTA124TUA-7

Overview

DDTA124TUA-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT323 package with built-in 22 kΩ bias resistor (R1 only), −50 V V_CEO, −100 mA I_C, 200 mW power dissipation, and h_FE of 100–600 at I_C = −1 mA, used for discrete logic-level switching in space-constrained automotive and industrial control circuits.

For engineers reviewing the DDTA124TUA-7 datasheet, DDTA124TUA-7 pinout, DDTA124TUA-7 application, or DDTA124TUA-7 equivalent, key selection criteria include verified R1 value (22 kΩ ±30%), guaranteed V_CE(sat) ≤ −0.3 V at I_C/I_B = −2.5 mA/−0.25 mA, AEC-Q101 qualification status, SOT323 thermal resistance (625 °C/W), and compatibility with lead-free reflow profiles.

Technical Context

This device integrates a single PNP bipolar junction transistor with one external-base biasing resistor (R1) monolithically embedded in the die structure-no internal R2-enabling simplified high-side switch design without discrete base resistors. It operates within −55 °C to +150 °C and supports stable DC switching up to 250 MHz f_T.

The SOT323 package delivers low thermal resistance (625 °C/W) on FR4 PCBs with minimum pad layout, and its −50 V breakdown ratings (V_CBO, V_CEO, V_EBO) support robust operation in 24 V industrial bus and 12 V automotive subsystems where transient suppression and ESD resilience are required.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mount package: 3-terminal, 1.8–2.2 mm × 2.0–2.2 mm footprint, 0.9–1.0 mm height, matte tin-plated leads, moisture sensitivity level 1, weight ≈ 0.006 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA124TUA-7, the DDTA124TKA-7 offers better thermal performance in less space-constrained layouts, while the NSV124T1T5G trades qualification and gain consistency for lower unit cost-neither matches the combined AEC-Q101 compliance, SOT323 miniaturization, and guaranteed h_FE range of the original.

Availability

DDTA124TUA-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC output modules, and medical infusion pump control systems requiring stable component supply, full RoHS 3 compliance, and AEC-Q101 traceability.

Supply support for DDTA124TUA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The DDTA series targets cost-optimized, space-constrained high-side switching applications in automotive and industrial environments, emphasizing integration, qualification, and green packaging without sacrificing electrical performance.

FAQ

What is the exact value and tolerance of the built-in bias resistor R1 in DDTA124TUA-7?

The DDTA124TUA-7 integrates a single base bias resistor R1 with a nominal value of 22 kΩ and a tolerance of ±30%, confirmed in the "Part Number R1 (NOM)" table of DS30327 Rev. 7-2. This value is laser-trimmed during wafer sort and validated per production test flow; no external resistor is required for standard logic-level drive.

Is DDTA124TUA-7 qualified to AEC-Q101, and what documentation supports this?

Yes, DDTA124TUA-7 is AEC-Q101 qualified. The datasheet footnote states: "For automotive applications requiring specific change control (i.e., parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative." Full qualification reports and PPAP documentation are available upon request through Diodes' automotive support portal.

Can DDTA124TUA-7 replace a standard PNP transistor like MMBT3906 in existing designs?

DDTA124TUA-7 can replace discrete PNP transistors in high-side switch configurations where base biasing is provided externally, but only if the existing circuit does not require dual-resistor (R1+R2) biasing or emitter degeneration. Its integrated 22 kΩ R1 sets fixed base current-designers must verify that resulting I_B yields sufficient h_FE-margin for target I_C under worst-case temperature and voltage.

What is the maximum continuous collector current at 100 °C ambient temperature?

At T_A = 100 °C, derating begins at 200 mW P_D with R_θJA = 625 °C/W. Using P_D = (T_J(max) − T_A) / R_θJA, max allowable P_D = (150 − 100) / 625 = 80 mW. At V_CE(sat) ≤ −0.3 V, max continuous I_C ≈ 80 mW / 0.3 V = 267 mA-but absolute maximum rating limits I_C to −100 mA regardless of power. Thus, I_C is capped at −100 mA.