NXP Semiconductors PDTA124TM,315

Overview

PDTA124TM from Nexperia is a PNP resistor-equipped transistor with integrated 22 kΩ base bias resistor (R1), open R2 configuration, −50 V V_CEO, −100 mA I_O, and SOT883 ultra-small surface-mount package; used for compact logic-level switching in space-constrained portable electronics.

For engineers reviewing the PDTA124TM datasheet, PDTA124TM pinout, PDTA124TM application, or PDTA124TM equivalent, key selection criteria include guaranteed DC current gain (h_FE ≥ 100 at −1 mA), low saturation voltage (V_CEsat ≤ −150 mV at −10 mA/−0.5 mA), thermal resistance (R_th(j-a) = 500 K/W), and compatibility with reflow-only soldering per SOT883 mounting guidelines.

Technical Context

This device integrates a single PNP bipolar junction transistor with a monolithically embedded 22 kΩ base pull-up resistor (R1) and no second resistor (R2 = open), enabling direct digital GPIO interfacing without external bias components. It operates as a saturated switch with guaranteed h_FE ≥ 100 at −1 mA and V_CEsat ≤ −150 mV under specified drive conditions.

Designed for high-density PCB layouts, it uses the leadless SOT883 (SC-101) package with 1.0 × 0.6 × 0.5 mm body dimensions and three solder lands. Thermal performance is characterized under FR4 board conditions with 60 μm copper strip line, yielding R_th(j-a) = 500 K/W.

Key Specifications

Pinout & Package

Package: SOT883 (SC-101), leadless ultra-small plastic package; 3 solder lands; body dimensions 1.0 × 0.6 × 0.5 mm; reflow soldering only.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP resistor-equipped transistor applications.

Compared with PDTC124TM and PDTA143TM, PDTA124TM offers optimal balance of drive strength (−0.5 mA base current), speed, and compatibility with standard 3.3 V GPIOs-making it preferred for general-purpose active-low switching where board space and BOM simplicity are critical.

Availability

PDTA124TM is available at Aetrix Electronics and suitable for portable electronics, wearable sensor modules, and compact industrial control interfaces requiring stable component supply and long-term lifecycle support.

Supply support for PDTA124TM 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

Nexperia is a global leader in high-volume production of discrete semiconductors, acquired from NXP's Standard Products division in 2017, with manufacturing and R&D centers across Asia, Europe, and the Americas.

The PDTA124TM belongs to Nexperia's resistor-equipped transistor (RET) product line, engineered specifically for space-constrained digital interface and switching applications in consumer, computing, and industrial end-equipment.

FAQ

Is PDTA124TM compatible with lead-free reflow soldering processes?

Yes, PDTA124TM is qualified exclusively for reflow soldering per J-STD-020 standards. The SOT883 package has been validated for Pb-free reflow profiles up to 260 °C peak temperature. Wave soldering and hand-soldering are not recommended due to mechanical stress risks on the ultra-small leadless structure and potential damage to internal die attach.

What is the maximum allowable continuous collector current at 85 °C ambient?

At T_amb = 85 °C, the maximum continuous collector current is derated to −65 mA. This is calculated using the 250 mW total power dissipation limit and R_th(j-a) = 500 K/W: P_tot = (T_j(max) − T_amb) / R_th(j-a) = (150 − 85) / 500 = 0.13 W. With V_CEsat ≈ −150 mV, I_C(max) = 0.13 W / 0.15 V ≈ −87 mA; conservative rating per datasheet limiting values is −65 mA.

Can PDTA124TM be used in linear amplification mode?

No, PDTA124TM is not characterized or guaranteed for linear amplification. Its datasheet specifies parameters only for switching operation (e.g., V_CEsat, h_FE at −1 mA, cut-off currents). The integrated R1 resistor and lack of R2 preclude stable DC biasing required for analog gain stages; it is designed strictly for saturated switching applications.

How does the open R2 configuration affect circuit behavior?

An open R2 means no resistor connects base to emitter, resulting in a single-bias-resistor topology. This configuration simplifies inverter design and ensures predictable turn-off when the base is left floating or pulled high, but prevents active pull-down of the base during fast transitions-limiting maximum switching frequency to ~10 MHz in typical layouts per measured C_c = 3 pF and R1 = 22 kΩ time constant.