Diodes Incorporated DDTA124XUA-7

Overview

DDTA124XUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring integrated bias resistors R1 = 22 kΩ and R2 = 47 kΩ (R1 ≠ R2), V_I(OFF) = −0.4 V, I_O(max) = −50 mA, and DC current gain G_L = −68 at V_CE = −5 V / I_C = −10 mA. It serves as a logic-level interface switch in low-power digital control circuits.

For engineers reviewing the DDTA124XUA-7 datasheet, DDTA124XUA-7 pinout, DDTA124XUA-7 application, or DDTA124XUA-7 equivalent, key selection criteria include input voltage thresholds (V_I(ON) = −1.4 V @ I_O = −2 mA), output saturation voltage (V_O(ON) = −0.3 V), resistor tolerance (±30% for 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 on-die biasing resistors (R1 = 22 kΩ, R2 = 47 kΩ), enabling direct connection to CMOS/TTL logic without external base resistors. Its R1 ≠ R2 configuration provides asymmetric input impedance and optimized switching thresholds for unidirectional level translation.

The transistor operates with V_CC = −50 V maximum, supports −50 mA continuous output current, and delivers stable DC current gain (G_L = −68) under V_CE = −5 V / I_C = −10 mA conditions. Thermal resistance R_θJA = 625 °C/W reflects its SOT-323 mounting on FR4 PCB per AP02001 layout.

Key Specifications

Pinout & Package

SOT-323 surface-mount plastic package (2.20 × 1.35 × 0.90 mm), UL 94V-0 rated, moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA124XUA-7, DDTA144WUA-7-F offers higher input threshold for 5 V compatibility but reduced gain, while DDTA114YUA-7-F trades input efficiency for greater output current and speed-both require revalidation of bias network timing and thermal margins.

Availability

DDTA124XUA-7 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and consumer appliance power sequencing requiring stable component supply and long-term manufacturing continuity.

Supply support for DDTA124XUA-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 and manufacturing operations across Asia and the Americas.

This part belongs to the DDTA (R1≠R2 Series) UA family of pre-biased PNP transistors engineered specifically for simplified digital interface design in space-constrained, cost-sensitive applications.

FAQ

What is the maximum operating temperature for DDTA124XUA-7?

The DDTA124XUA-7 has an operating junction temperature range of −55°C to +150°C. Its thermal resistance R_θJA is 625°C/W when mounted on FR4 PCB using Diodes Inc.'s recommended AP02001 pad layout. Derating begins above +25°C ambient, reaching zero power at +150°C.

Can DDTA124XUA-7 replace a standard PNP transistor with external bias resistors?

Yes-it replaces a discrete PNP transistor plus two base resistors (22 kΩ and 47 kΩ) in series configuration. The internal R1–R2 network is laser-trimmed to ±30% R1 tolerance and ±20% R2/R1 ratio, eliminating manual resistor selection and placement while maintaining identical functional behavior.

Is DDTA124XUA-7 compatible with lead-free reflow processes?

Yes-the device uses matte tin finish over Alloy 42 leadframe and complies with J-STD-020C Level 1 moisture sensitivity. It supports standard Pb-free reflow profiles up to 260°C peak temperature and passes solderability testing per MIL-STD-202 Method 208.

How does the R1 ≠ R2 architecture improve switching performance?

The asymmetric resistor values (22 kΩ / 47 kΩ) create unequal current division at the base node, lowering effective input capacitance and sharpening transition edges. This yields faster turn-on/turn-off times versus symmetric R1=R2 designs, confirmed by f_T = 250 MHz measurement on the bare transistor die.