NXP Semiconductors PEMB9,315

Overview

PEMB9 from Nexperia is a PNP/PNP resistor-equipped double transistor (RET) in SOT666 package, rated for −50 V V_CEO, −100 mA I_O, with built-in R₁ = 10 kΩ and R₂/R₁ = 4.7 ratio. It functions as a dual digital switching element for low-current logic interfacing and peripheral control, replacing discrete base-biased PNP pairs in space-constrained PCBs.

For engineers reviewing the PEMB9 datasheet, PEMB9 pinout, PEMB9 application, or PEMB9 equivalent, this device is selected for compact digital signal conditioning where integrated biasing eliminates external resistors, reduces BOM count, and supports high-density SMT assembly on FR4 boards with reflow-only soldering.

Technical Context

The PEMB9 integrates two matched PNP transistors with monolithically embedded bias networks-R₁ (input resistor) and R₂ (base-emitter feedback resistor)-enabling direct TTL/CMOS-level input drive without external components. Each transistor operates with V_CEO = −50 V and I_O = −100 mA under DC conditions.

Its SOT666 package features six leads in 0.5 mm pitch, with GND1/O1/I1 assigned to TR1 and GND2/O2/I2 assigned to TR2 in a symmetrical layout. Thermal resistance is 417 K/W (per device, free air), and maximum junction temperature is 150 °C.

Key Specifications

Pinout & Package

SOT666 is a 6-lead ultra-small flat lead surface-mount plastic package (1.6 mm × 1.2 mm × 0.55 mm body, 0.5 mm pitch), optimized for high-density routing and automated placement. Pin numbering follows standard top-view orientation with pin 1 marked by index notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PEMD9 and PEMH9, PEMB9 provides matched dual-sinking capability ideal for LED arrays and low-side MCU interfaces, whereas PEMD9 enables complementary output stages and PEMH9 serves positive-voltage active-high switching-each requiring distinct PCB layout and signal polarity planning.

Availability

PEMB9 is available at Aetrix Electronics and suitable for LED indicator driver circuits, microcontroller GPIO expansion, industrial digital input buffering, and legacy logic interface adaptation requiring stable component supply and long-term manufacturability.

Supply support for PEMB9 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 specializing in high-volume, high-reliability discrete and logic devices, with core competencies in automotive-grade and industrial-standard components.

The PEMB9 belongs to Nexperia's Resistor-Equipped Transistor (RET) product line, engineered to simplify digital interface design by integrating precision bias networks into miniature SMT packages for consumer, industrial, and computing applications.

FAQ

What is the maximum allowable input voltage applied to I1 or I2 pins?

The absolute maximum input voltage (VI) is −40 V, as specified in Table 5 (Limiting Values). This rating applies with respect to GND1 or GND2 respectively, and exceeds typical system requirements for industrial I/O protection. Operation above −6 V VEBO or below −40 V VI risks permanent damage due to emitter-base junction breakdown.

Can PEMB9 be used in linear amplifier configurations?

No-PEMB9 is characterized and qualified exclusively for switching operation. Its h_FE is specified only at V_CE = −5 V and IC = −5 mA, and no small-signal parameters (e.g., f_T linearity, gm, or noise figure) are guaranteed outside saturated switching conditions. Linear use violates Absolute Maximum Ratings and voids performance warranties.

Is thermal derating required when operating at ambient temperatures above 25 °C?

Yes-Fig. 1 shows linear derating of total device power dissipation (P_tot) from 300 mW at 25 °C to zero at 125 °C. At 75 °C ambient, maximum allowed P_tot is 200 mW. Designers must calculate combined power of both transistors (P = |V_CE| × |I_C|) and apply this curve to ensure junction temperature stays ≤150 °C.

Does the SOT666 package support hand-soldering or rework?

No-Nexperia explicitly states in Section 8 that reflow soldering is the only recommended method. The 0.5 mm pitch, thermal mass asymmetry, and internal leadframe geometry make hot-air or iron-based rework highly unreliable and likely to cause pad lifting or internal bond wire damage. Rework requires dedicated SMT rework stations with calibrated IR preheat and nozzle profiling.