Diodes Incorporated DDTA124GUA-7-F

Overview

DDTA124GUA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor with built-in 22 kΩ bias resistor (R2 only), rated for -50 V V_CEO, -100 mA I_C, and 200 mW power dissipation in SOT-323 package; used in digital logic interface, level translation, and load switching circuits in consumer and industrial control systems.

For engineers reviewing the DDTA124GUA-7-F datasheet, DDTA124GUA-7-F pinout, DDTA124GUA-7-F application, or DDTA124GUA-7-F equivalent, key selection criteria include verified R2 value (22 kΩ ±30%), h_FE = 56 at I_C = -5 mA, V_CE(sat) ≤ -0.3 V, ESD robustness per JEDEC JS-001, and SOT-323 thermal performance on FR4 PCBs.

Technical Context

This device implements a single PNP bipolar junction transistor with monolithic integration of a 22 kΩ base-emitter pull-up resistor (R2), eliminating external bias components. It operates in saturation or cutoff mode for digital switching, with guaranteed V_CEO = -50 V and BVEBO = 5 V minimum.

The epitaxial planar die construction ensures stable h_FE across temperature (-55°C to +150°C), while the SOT-323 package provides 625°C/W junction-to-ambient thermal resistance when mounted per AP02001 pad layout.

Key Specifications

Pinout & Package

SOT-323 plastic surface-mount package with gull-wing leads; dimensions per DS30328 Rev. 6 (A: 0.25–0.40 mm, B: 1.15–1.35 mm, C: 2.00–2.20 mm); moisture sensitivity level 1; RoHS-compliant matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA124GUA-7-F, the DDTA124EUA-7-F saves 40% board area but sacrifices thermal headroom, while the NSVDDTA124GUT5G adds automotive qualification and tighter R2 control at no electrical cost-making it ideal for safety-critical deployments.

Availability

DDTA124GUA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and power rail enable switching requiring stable component supply and consistent SOT-323 tape-and-reel delivery.

Supply support for DDTA124GUA-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

This part belongs to the DDTA R2-only pre-biased transistor series, designed specifically to simplify digital interface design by integrating a single base-emitter bias resistor-targeting cost-sensitive, space-constrained consumer and industrial control applications.

FAQ

What is the exact value and tolerance of the internal bias resistor R2 in DDTA124GUA-7-F?

The internal R2 resistor is 22 kΩ with a tolerance of ±30%, as confirmed in the Electrical Characteristics table on page 2 of DS30328 Rev. 6. This value is laser-trimmed during wafer sort and validated per production test flow; no external calibration is required for standard digital switching use cases.

Can DDTA124GUA-7-F be used in place of a standard PNP transistor with an external base resistor?

Yes-it replaces discrete PNP + resistor combinations in high-side switch configurations. Its integrated R2 enables direct connection to CMOS/TTL logic outputs, but note that base current is fixed; unlike discrete designs, you cannot adjust bias for varying load currents or temperature drift compensation.

Is thermal derating required when operating above 25°C ambient?

Yes-derating follows the linear curve in Figure 1: power dissipation must be reduced by 0.32 mW/°C above 25°C. At 85°C ambient, maximum allowable P_D drops to 181 mW. Use AP02001-recommended pad layout to maintain specified R_θJA = 625°C/W.

Does this device support bidirectional signal translation or analog amplification?

No-it is optimized for digital switching only. The fixed R2, limited h_FE linearity, and absence of small-signal AC parameters (e.g., r_π, C_ob vs. frequency) preclude use in linear amplification or bidirectional level shifting; it functions strictly as a saturated/cutoff switch.