Nexperia USA Inc. PUMH7HX

Overview

PUMH7HX from Nexperia is a dual NPN resistor-equipped transistor (RET) in SOT363 (TSSOP6) package, featuring integrated 4.7 kΩ base bias resistors per transistor, 50 V V_CEO, 100 mA I_O, and operation up to 175 °C ambient - used for digital signal switching and IC input control in space-constrained industrial logic interfaces.

For engineers reviewing the PUMH7HX datasheet, PUMH7HX pinout, PUMH7HX application, or PUMH7HX equivalent, this page delivers verified pin functions, thermal derating behavior, built-in resistor tolerances, and direct alternatives for BC847-based digital switching designs.

Technical Context

This device integrates two matched NPN transistors with dedicated base-emitter bias resistors (R1 = 4.7 kΩ, R2 open), eliminating external pull-up/down components. Each transistor operates independently with isolated emitter grounds (GND1/GND2) and cross-coupled output routing (O1/O2).

It supports high-temperature digital switching with guaranteed V_CEO = 50 V, I_O = 100 mA, and junction temperature rating up to 175 °C. The SOT363 footprint enables dense placement while maintaining thermal resistance of 417 K/W (per device, FR4 PCB).

Key Specifications

Pinout & Package

SOT363 (TSSOP6) plastic surface-mount package: 2.1 mm × 1.25 mm × 0.95 mm body, 0.65 mm lead pitch, FR4-compatible footprint per Fig. 12–13.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual NPN RET applications.

Compared with BC847BPDW1T3G and PUMB3H, PUMH7HX uniquely combines dual NPN topology, integrated 4.7 kΩ biasing, and 175 °C operation in one SOT363 device - reducing layout complexity and enabling single-part qualification for high-temp digital interface designs.

Availability

PUMH7HX is available at Aetrix Electronics and suitable for industrial digital I/O expansion, automotive body control module inputs, and consumer appliance control logic requiring stable component supply across extended temperature ranges.

Supply support for PUMH7HX 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 high-volume, high-reliability essential semiconductors - delivering performance, efficiency, and consistency for mass-market electronics.

PUMH7HX belongs to Nexperia's Resistor-Equipped Transistor (RET) product line, engineered specifically to replace discrete BJT-resistor combinations in digital switching applications while improving thermal robustness and assembly yield.

FAQ

What is the function of Pin 3 (O2) and Pin 6 (O1) in PUMH7HX?

Pin 3 (O2) is the collector output of the second NPN transistor (TR2), and Pin 6 (O1) is the collector output of the first NPN transistor (TR1). Both operate as open-collector, active-low sink outputs - pulled low when their respective base inputs (I2 and I1) are driven high above VI(on) (~0.88 V), enabling direct interfacing with 3.3 V or 5 V logic systems without external pull-ups.

Does PUMH7HX include internal base-emitter resistors (R2), and what is their value?

No, PUMH7HX has R2 = open (unconnected) per datasheet Table 8 and Figure 10. Only R1 = 4.7 kΩ (±28%) is integrated per transistor - connecting each base (I1/I2) to its respective emitter (GND1/GND2). There is no internal base-emitter resistor; external pull-downs must be added if required for specific logic states.

Can PUMH7HX replace BC847 series transistors directly in existing designs?

Yes - as a functional drop-in replacement for two BC847 devices in digital switching roles, provided the circuit uses base biasing through ~4.7 kΩ resistors and does not require base-emitter shunt resistors. Layout changes are needed to accommodate the SOT363 footprint, and GND1/GND2 isolation must be accounted for in grounding strategy.

What is the thermal resistance from junction to ambient (R_th(j-a)) for PUMH7HX on a standard FR4 PCB?

Per Table 6, the per-device R_th(j-a) is 417 K/W when mounted on a single-sided FR4 PCB with 35 µm tin-plated copper and standard footprint (Fig. 12). This value assumes natural convection only and forms the basis for thermal derating - e.g., maximum power drops to 180 mW at 100 °C ambient.