Nexperia USA Inc. PDTA143ZT-QR

Overview

PDTA143ZT-QR from Nexperia is a PNP resistor-equipped transistor (RET) in SOT23 package, designed for digital switching in automotive and industrial systems. It features built-in bias resistors R1 = 4.7 kΩ and R2 = 47 kΩ, V_CEO = −50 V, I_O = −100 mA, and AEC-Q101 qualification - used to control IC inputs and switch low-power loads.

For engineers reviewing the PDTA143ZT-QR datasheet, PDTA143ZT-QR pinout, PDTA143ZT-QR application, or PDTA143ZT-QR equivalent, key selection criteria include its integrated R1/R2 ratio (10), guaranteed V_I(on) ≤ −0.9 V at I_C = −5 mA, and thermal resistance R_th(j-a) = 500 K/W on FR4 PCB.

Technical Context

This RET integrates a PNP bipolar transistor with two precision silicon-based bias resistors (R1 between base and input, R2 between base and emitter) to form a single-input, single-output digital switch. Its internal topology eliminates external base resistors and ensures predictable turn-on/off thresholds across temperature.

The device operates as a saturated switch with V_CE(sat) ≤ −100 mV at I_C = −5 mA / I_B = −0.25 mA and supports off-state input voltage V_I(off) ≥ −0.6 V - enabling direct interfacing with 3.3 V and 5 V logic without level-shifting.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pitch); 3-terminal configuration with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP digital switching applications.

Compared with PDTC143ZT-Q, PDTA143ZT-QR offers identical performance with enhanced traceability and lot-level automotive qualification reporting; versus BC857BW, it delivers lower assembly cost and higher production yield through resistor integration and guaranteed switching thresholds.

Availability

PDTA143ZT-QR is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC outputs, and consumer appliance control boards requiring stable component supply and AEC-Q101 compliance.

Supply support for PDTA143ZT-QR 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 semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

PDTA143ZT-QR belongs to Nexperia's Automotive-Qualified Resistor-Equipped Transistor (RET) product line, engineered to replace discrete BJT + resistor combinations in cost-sensitive, high-reliability digital switching applications.

FAQ

Is PDTA143ZT-QR pin-compatible with BC847/BC857 series transistors?

No - PDTA143ZT-QR uses Pin 1 = Input, Pin 2 = GND, Pin 3 = Output, whereas BC847/BC857 have Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. Direct replacement requires schematic and layout revision to accommodate the RET's integrated bias topology and reversed terminal assignment.

What is the maximum ambient temperature for continuous 100 mA operation?

At I_O = −100 mA and P_tot = 250 mW, the device reaches thermal limit at T_amb ≈ 75 °C on standard FR4 PCB (R_th(j-a) = 500 K/W). Derating is required above this; full-rated current is only sustainable below 25 °C ambient unless heatsinking or airflow is added.

Does PDTA143ZT-QR support 1.8 V logic input drive?

No - its V_I(on) specification is −0.9 V minimum (typical −1.3 V), meaning it requires ≥0.9 V negative swing relative to emitter. With emitter tied to ground, this implies ≥0.9 V positive logic-high voltage. It is not compatible with 1.8 V CMOS without level-shifting or emitter biasing.

How does the R2/R1 ratio affect switching behavior?

The R2/R1 = 10 ratio provides emitter feedback that stabilizes the base voltage during switching, reducing sensitivity to variations in h_FE and temperature. This yields consistent V_I(on)/V_I(off) thresholds and prevents partial turn-on states that could cause excessive power dissipation in the transistor.