NXP Semiconductors PEMB4,115

Overview

PEMB4 from Nexperia is a dual PNP resistor-equipped transistor (RET) in SOT666 package, featuring integrated 10 kΩ base bias resistors (R1), open R2 configuration, −50 V VCEO, −100 mA IO per transistor, and designed for low-current digital switching in space-constrained logic interface circuits.

For engineers reviewing the PEMB4 datasheet, PEMB4 pinout, PEMB4 application, or PEMB4 equivalent, this device serves as a drop-in replacement for discrete PNP pairs in level-shifting, bus buffering, and IC input control-where simplified BOM, reduced PCB footprint, and guaranteed bias stability are critical selection criteria.

Technical Context

The PEMB4 integrates two independent PNP transistors sharing no internal connection between R1 and R2; R2 is unconnected (open), enabling fixed-base biasing only on TR1's base (Pin 2) and TR2's base (Pin 5). Each transistor operates with VCE ≤ −50 V and supports DC output current up to −100 mA.

Thermal performance is defined for FR4 PCB mounting: junction-to-ambient thermal resistance is 416 K/W per device (SOT666), and maximum junction temperature is rated at 150 °C. The device uses reflow soldering exclusively and is not rated for wave or hand-soldering.

Key Specifications

Pinout & Package

PEMB4 is housed in a plastic surface-mounted SOT666 package (6-lead, 1.7 mm × 1.3 mm × 0.95 mm), optimized for automated assembly and high-density routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PUMB4, PEMB4 offers identical electrical behavior in a slightly smaller footprint (1.7 mm × 1.3 mm vs. 2.2 mm × 1.35 mm), while EMB4 trades gain and saturation performance for lower unit cost-making PEMB4 optimal for precision digital interface and low-loss switching.

Availability

PEMB4 is available at Aetrix Electronics and suitable for LED driver interfaces, microcontroller GPIO expansion, bus signal inversion, and power sequencing controllers requiring stable component supply across automotive infotainment, industrial HMI, and IoT edge node programs.

Supply support for PEMB4 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 discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with manufacturing and R&D centers across Asia, Europe, and the Americas.

PEMB4 belongs to Nexperia's resistor-equipped transistor (RET) product line, engineered specifically for BOM simplification and reliability enhancement in digital interface and low-power switching applications across consumer, industrial, and computing markets.

FAQ

Is PEMB4 pin-compatible with PUMB4?

No-PEMB4 uses SOT666 (1.7 mm × 1.3 mm) with 0.5 mm lead pitch, while PUMB4 uses SOT363 (2.2 mm × 1.35 mm) with 0.65 mm pitch. Pin numbering differs: PEMB4 Pin 1 = TR1 emitter; PUMB4 Pin 1 = TR1 emitter, but physical pad locations and solder mask layouts are incompatible without PCB redesign.

Can PEMB4 replace discrete PNP transistors like BC857 in existing designs?

Yes, provided the circuit relies on external 10 kΩ base resistors-PEMB4 integrates those resistors internally. However, verify that the original design does not require R2 connection or adjustable bias; PEMB4 has R2 open, so it cannot replicate variable-gain or feedback configurations.

What is the maximum ambient temperature for continuous operation?

PEMB4 is rated for continuous operation from −65 °C to +150 °C ambient temperature. At Tamb = 150 °C, derating applies: total power dissipation must be reduced to zero; full 300 mW rating is valid only at Tamb ≤ 25 °C with standard FR4 mounting.

Does PEMB4 support PWM dimming of LEDs at 1 kHz?

Yes-its typical transition time is <100 ns, and Cc = 3 pF ensures minimal capacitive loading. At 1 kHz, switching losses remain negligible (<0.5 mW), and VCEsat stability guarantees consistent LED current without thermal drift or duty-cycle distortion.