Nexperia USA Inc. PUMB9/ZLX

Overview

PUMB9 from Nexperia is a PNP/PNP resistor-equipped double transistor (RET) in SOT363-3 (SC-88) package, rated for −50 V V_CEO, −100 mA output current per transistor, with built-in bias resistors R1 = 10 kΩ and R2 = 47 kΩ. It serves as a compact, AEC-Q101-qualified digital switching pair for low-current peripheral driver and IC input control functions in automotive and industrial PCBs.

For engineers reviewing the PUMB9 datasheet, PUMB9 pinout, PUMB9 application, or PUMB9 equivalent, this page delivers verified electrical parameters, validated dual-transistor circuit role, thermal derating behavior, and real-world use cases in space-constrained digital interface designs.

Technical Context

The PUMB9 integrates two matched PNP transistors with monolithically embedded base bias networks-R1 (input resistor) and R2 (feedback resistor)-enabling direct logic-level drive without external bias components. Each transistor operates with open-base V_CEO = −50 V and I_O = −100 mA, supporting robust saturation at V_CE(sat) ≤ −100 mV under I_C = −5 mA / I_B = −0.25 mA.

Its dual-emitter-grounded topology (GND1 and GND2 on pins 1 and 4) supports independent or cascaded switching configurations. The R2/R1 ratio of 4.7 ensures stable current gain (h_FE ≥ 100 at I_C = −5 mA) across −40 °C to +100 °C ambient, with junction temperature limited to 150 °C.

Key Specifications

Pinout & Package

SOT363-3 (SC-88/TSSOP6) plastic surface-mount package: 2.2 mm × 1.35 mm footprint, 0.65 mm pitch, 0.95 mm max height, designed for reflow soldering with standard 0.5 mm paste apertures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PUMD9 and PUMH9, the PUMB9 uniquely provides dual-sinking PNP outputs ideal for grounded-load configurations in automotive and industrial control-offering superior noise immunity and simpler biasing than mixed- or NPN-only alternatives.

Availability

PUMB9 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for PUMB9 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.

The PUMB9 belongs to Nexperia's Resistor-Equipped Transistor (RET) product line, engineered specifically to replace discrete transistor-resistor combinations in digital interface and low-power switching applications-reducing design time and manufacturing cost.

FAQ

What is the maximum operating temperature for PUMB9 in continuous operation?

The PUMB9 has a maximum junction temperature (T_j) of 150 °C and an ambient operating range of −65 °C to +150 °C. On a standard FR4 PCB, its thermal resistance is 417 K/W, so continuous operation at full 100 mA per transistor is limited to ≤85 °C ambient to stay within safe junction limits-derating is required above that point.

Can PUMB9 be used in place of two separate BC857 transistors with external 10 kΩ and 47 kΩ resistors?

Yes-PUMB9 replaces two BC857 PNP transistors plus four external resistors (two R1, two R2) in a single SOT363-3 package. Its integrated R1/R2 network matches the specified values and tolerances, and its AEC-Q101 qualification exceeds BC857's industrial rating-making it a drop-in upgrade for automotive and high-reliability designs.

Does PUMB9 support parallel operation of both transistors for higher current?

No-PUMB9's transistors share no internal current-sharing mechanism and have independent emitters (GND1 and GND2). Parallel connection would cause mismatched current distribution due to h_FE and V_BE variations. For >100 mA, use a single higher-rated RET like PBSS4041P or discrete solution with forced current balancing.

Is the marking code 'B%9' laser-etched or ink-printed on the device?

The marking code 'B%9' (where % is a site-specific character) is laser-marked on the top surface of the PUMB9 package per Nexperia's standard SOT363-3 marking specification. Laser marking ensures permanent legibility after reflow, cleaning, and long-term environmental exposure-critical for traceability in automotive and medical applications.