Nexperia USA Inc. PUMB1/DG/B4X

Overview

PUMB1/DG/B4X from Nexperia is a dual PNP resistor-equipped transistor (RET) in SOT363 (SC-88) surface-mount package, integrating two matched PNP transistors with built-in 22 kΩ input bias resistors (R1 = R2 = 22 kΩ) and R2/R1 ratio of 1.0 ±20%. It delivers −100 mA output current per transistor, supports −50 V collector-emitter voltage, and is AEC-Q101 qualified for automotive signal-level switching applications such as LED driver control and logic-level translation.

For engineers reviewing the PUMB1/DG/B4X datasheet, PUMB1/DG/B4X pinout, PUMB1/DG/B4X application, or PUMB1/DG/B4X equivalent, this page provides verified pin functions, thermal derating curves, on/off-state input voltage thresholds (VI(on) = −1.7 V typ, VI(off) = −1.1 V typ), DC current gain (hFE ≥ 60 at IC = −5 mA), and validated alternatives for digital interface and peripheral driver designs.

Technical Context

This dual PNP RET integrates two independent PNP transistors sharing no internal connection between collectors or emitters - each has dedicated base-input (with R1), emitter-GND, and collector-output terminals. The internal resistor network eliminates external bias components and enables direct TTL/CMOS logic interfacing without level-shifting circuitry.

It operates with guaranteed VI(on) ≤ −1.7 V and VI(off) ≥ −1.1 V at 25 °C, ensuring reliable turn-on under standard logic low conditions and robust noise immunity. Thermal resistance is 417 K/W per device on FR4 PCB, supporting continuous operation up to +150 °C junction temperature with appropriate power derating.

Key Specifications

Pinout & Package

SOT363 (SC-88) 6-pin ultra-small flat-lead plastic package, 2.2 mm × 1.35 mm footprint, 0.65 mm pitch, 0.95 mm max height. RoHS-compliant, reflow-solder compatible only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PUMB1/DG/B4X, NSVD2P0233MUTBG trades output current for lower static power, while EMZ6T2R sacrifices pin compatibility and dual-PNP symmetry for complementary functionality - neither offers drop-in replacement capability without circuit or layout changes.

Availability

PUMB1/DG/B4X is available at Aetrix Electronics and suitable for automotive body electronics, industrial I/O modules, and consumer appliance control systems requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.

Supply support for PUMB1/DG/B4X 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, spun off from NXP in 2017 and focused on high-volume, high-reliability components for automotive, industrial, and computing markets.

This part belongs to Nexperia's Resistor-Equipped Transistor (RET) product line, designed specifically to replace general-purpose transistors in digital interface and peripheral driver applications with integrated biasing and AEC-Q101 validation.

FAQ

What is the maximum ambient temperature for continuous operation at full rated current?

PUMB1/DG/B4X supports continuous operation up to +85 °C ambient at full −100 mA per transistor, provided PCB thermal design maintains junction temperature ≤150 °C. Derating begins above 25 °C at 2.4 mW/°C (based on Rth(j-a) = 417 K/W per device), reaching zero power at +150 °C ambient.

Can Pins 1 and 4 be connected to separate ground domains?

No - Pins 1 and 4 are both emitter terminals tied internally to their respective transistor emitters but not electrically connected to each other. They may be routed to separate ground nets only if isolation is required; however, doing so introduces mismatched reference potentials and invalidates VI(on)/VI(off) specifications unless both grounds are tightly coupled (<10 mV difference).

Is wave soldering supported for the SOT363 package?

No - Nexperia explicitly specifies reflow soldering as the only recommended method for PUMB1/DG/B4X. Wave soldering is not qualified and risks thermal damage due to the SC-88 package's low thermal mass and proximity of leads; Figure 14 in the datasheet shows wave footprint only for legacy reference, not endorsement.

How does the R2/R1 ratio affect switching performance?

The R2/R1 ratio (0.8–1.2) controls base current division between input and feedback paths. A ratio near 1.0 ensures consistent VI(on) and VI(off) thresholds across production lots, enabling predictable logic-level interfacing without calibration. Deviations >±20% increase threshold variation and reduce noise immunity in marginal signal environments.