NXP Semiconductors PDTC143ES,126

Overview

PDTC143ES from NXP Semiconductors is an NPN resistor-equipped transistor with integrated bias resistors R1 = 4.7 kΩ and R2 = 4.7 kΩ, designed for general-purpose switching in through-hole applications. It delivers 100 mA DC output current, supports 50 V collector-emitter voltage, and uses a TO-92 (SOT54) package for robust leaded mounting in industrial control and interface circuits.

For engineers reviewing the PDTC143ES datasheet, PDTC143ES pinout, PDTC143ES application, or PDTC143ES equivalent, this page provides verified pin configuration, thermal resistance (250 K/W), input-on/off voltage thresholds, saturation voltage (≤150 mV), and validated alternatives for discrete logic-level switching designs.

Technical Context

The PDTC143ES integrates two precision 4.7 kΩ bias resistors to form a single-chip solution that replaces three discrete components: an NPN transistor plus two external base resistors. Its internal resistor ratio (R2/R1 = 1.0 ±0.2) ensures stable turn-on/turn-off behavior under varying temperature and supply conditions.

Designed for DC switching-not linear amplification-the device features low VCEsat (≤150 mV at IC = 10 mA, IB = 0.5 mA), fast response due to low collector capacitance (≤2.5 pF), and guaranteed operation across −65 °C to +150 °C ambient range with junction temperature up to 150 °C.

Key Specifications

Pinout & Package

PDTC143ES uses the plastic single-ended leaded (through-hole) SOT54 (TO-92) package, with 3 leads and standard 2.54 mm lead pitch. The body measures 4.8 × 4.2 × 14.5 mm (L × W × H), optimized for manual assembly and wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PDTC143ET and MMBT3904T, the PDTC143ES uniquely combines through-hole mechanical reliability, integrated biasing, and 500 mW power handling-making it optimal for serviceable, medium-current industrial interfaces where solder joint integrity and design simplicity are prioritized.

Availability

PDTC143ES is available at Aetrix Electronics and suitable for industrial PLC input stages, microcontroller GPIO drivers, automotive body control modules, and consumer appliance interface circuits requiring stable component supply and long-term manufacturability.

Supply support for PDTC143ES 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PDTC143ES belongs to NXP's resistor-equipped transistor family, engineered to simplify discrete logic-level switching by integrating precision bias resistors-targeting cost-sensitive, high-volume industrial and consumer control systems.

FAQ

What is the maximum collector-emitter voltage rating for PDTC143ES?

The PDTC143ES has a maximum collector-emitter voltage (VCEO) rating of 50 V, tested under open-base conditions. This rating allows safe operation in 24 V industrial control systems with adequate safety margin and ensures robustness against transient voltage spikes commonly found in relay-driven or inductive-load environments. The PDTC143ES maintains this rating across its full operating temperature range.

Does PDTC143ES require external base resistors for microcontroller interfacing?

No, the PDTC143ES does not require external base resistors because it integrates R1 = 4.7 kΩ and R2 = 4.7 kΩ internally. When driven by a 3.3 V or 5 V microcontroller GPIO, the internal network provides appropriate base current limiting and ensures reliable saturation. This eliminates two passive components per switch, reducing BOM cost and layout complexity for the PDTC143ES implementation.

What is the thermal resistance (Rth(j-a)) of PDTC143ES and how does it affect power handling?

The PDTC143ES has a junction-to-ambient thermal resistance (Rth(j-a)) of 250 K/W in free air, measured in its SOT54 (TO-92) package. At 25 °C ambient, this limits total power dissipation to 500 mW before reaching the 150 °C maximum junction temperature. Engineers must derate linearly above 25 °C-for example, to ~300 mW at 85 °C ambient-ensuring safe operation of the PDTC143ES in enclosed or elevated-temperature enclosures.

Can PDTC143ES be used as a direct replacement for a standard 2N3904 with external bias resistors?

Yes, the PDTC143ES can replace a 2N3904 plus two 4.7 kΩ resistors in switching applications, provided the circuit operates within its 100 mA IO and 50 V VCEO limits. Unlike the 2N3904, the PDTC143ES guarantees resistor matching (R2/R1 = 1.0 ±0.2) and fixed input thresholds, improving consistency across production units and temperature. However, it is not a drop-in replacement for linear amplifier roles due to its fixed bias architecture.

What are the key differences between PDTC143ES and PDTC143ET?

The PDTC143ES uses a through-hole SOT54 (TO-92) package rated for 500 mW power dissipation and 250 K/W thermal resistance, while the PDTC143ET uses a surface-mount SOT23 package rated for 250 mW and 500 K/W. Both share identical R1/R2 values and electrical switching characteristics, but the PDTC143ES offers superior thermal performance and mechanical robustness for manual assembly or high-reliability industrial use cases.