Diodes Incorporated DDTA124GUA-7

Overview

DDTA124GUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor with built-in R2 bias resistor (22 kΩ), SOT-323 package, −50 V V_CEO, −100 mA I_C, and h_FE = 56 at −5 mA/−5 V, used in discrete logic-level switching and level-shifting circuits.

For engineers reviewing the DDTA124GUA-7 datasheet, DDTA124GUA-7 pinout, DDTA124GUA-7 application, or DDTA124GUA-7 equivalent, key selection criteria include verified R2-only biasing topology, guaranteed V_CE(sat) ≤ −0.3 V at −10 mA/−0.5 mA drive, JEDEC-compliant SOT-323 thermal performance (R_θJA = 625 °C/W), and RoHS/Green compliance per Diodes Inc. AP02001 pad layout.

Technical Context

This device implements a single-PNP transistor with only an emitter-base pull-up resistor (R2 = 22 kΩ ±30%), no R1, enabling simplified high-side switch control without external base bias networks. It operates within −55 °C to +150 °C and supports DC switching up to 250 MHz f_T.

The SOT-323 package uses matte tin-plated Alloy 42 leads, UL 94V-0 molding compound, and meets J-STD-020C Level 1 moisture sensitivity. Electrical validation includes BVEBO = −5 V (IE = −330 μA) and ICBO ≤ −0.5 μA at VCB = −50 V.

Key Specifications

Pinout & Package

SOT-323 surface-mount plastic package with 3 terminals: Emitter (E), Base (B), Collector (C); dimensions per DS30328 Rev. 6 (A: 0.25–0.40 mm, B: 1.15–1.35 mm, C: 2.00–2.20 mm, D: 0.65 mm nominal, E: 0.30–0.40 mm, G: 1.20–1.40 mm, H: 1.80–2.20 mm, K: 0.90–1.00 mm, L: 0.25–0.40 mm, M: 0.10–0.18 mm, α: 0°–8°).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA124GUA-7, DDTA124EUA-7 offers identical electrical behavior but different traceability coding, while NSVDDTA124GUA adds AEC-Q101 qualification-critical for automotive use but unnecessary for industrial or consumer applications where cost and lead time are prioritized.

Availability

DDTA124GUA-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller GPIO expansion, and consumer appliance logic requiring stable component supply with full RoHS and Green compliance.

Supply support for DDTA124GUA-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, serving industrial, computing, communications, and consumer markets since 1960.

The DDTA (R2-ONLY SERIES) UA product line delivers pre-biased PNP transistors optimized for space-constrained, high-reliability discrete logic switching-designed specifically to reduce bill-of-materials count in microcontroller interfacing and level translation.

FAQ

What is the function of the R2-only bias configuration in DDTA124GUA-7?

The R2-only configuration integrates a single 22 kΩ resistor between base and emitter, eliminating the need for an external base pull-up (R1). This simplifies circuit design for active-low switching, where the transistor turns on when the base is pulled low relative to the emitter-ideal for direct MCU GPIO control without additional passives.

Can DDTA124GUA-7 replace a standard PNP transistor like BC807 in existing designs?

No-it cannot directly replace non-pre-biased transistors without circuit modification. DDTA124GUA-7 requires no external base resistor, whereas BC807 needs R1 for biasing. Swapping requires removing R1 and verifying that the logic drive polarity (active-low vs. active-high) matches the R2-only topology's turn-on condition.

Is the SOT-323 package of DDTA124GUA-7 compatible with standard reflow profiles?

Yes-the device is rated J-STD-020C Level 1 moisture sensitivity and uses matte tin-plated Alloy 42 leads. It supports industry-standard Pb-free reflow profiles (peak 260 °C, 60 sec max above 217 °C) without baking, provided the PCB follows Diodes Inc.'s AP02001 recommended pad layout for thermal reliability.

How does the −50 V V_CEO rating impact its use in 12 V automotive systems?

The −50 V rating exceeds ISO 7637-2 Pulse 1 (−50 V load-dump transient), allowing DDTA124GUA-7 to survive worst-case voltage spikes without external clamping. This enables robust operation in 12 V body-control modules without adding TVS diodes-reducing component count and board space in cost-sensitive automotive applications.