Nexperia USA Inc. PMST6428,115

Overview

PMST6428 from Nexperia is an NPN general-purpose bipolar junction transistor in SC-70 (SOT323) package, rated for 50 V V_CEO, 100 mA I_C, and 200 mW P_tot, with DC current gain h_FE ≥ 250 at I_C = 1 mA and f_T up to 700 MHz - used for low-power signal switching and amplification in telephony interface circuits.

For engineers reviewing the PMST6428 datasheet, PMST6428 pinout, PMST6428 application, or PMST6428 equivalent, key selection considerations include its SOT323 footprint compatibility, low V_CE(sat) (≤ 600 mV at 100 mA), tight h_FE distribution across bias points, and thermal resistance of 625 K/W on FR4 PCB - critical for space-constrained analog front-ends and line-card signal conditioning.

Technical Context

This device operates as a single NPN silicon transistor optimized for linear and switching operation in low-voltage, low-current signal paths. Its structure supports stable h_FE from 0.01 mA to 10 mA (min 250), low C_c (3 pF) and C_e (12 pF), and high f_T (100–700 MHz), enabling broadband small-signal amplification up to VHF range.

Designed for surface-mount assembly on standard FR4 boards, it uses base-emitter and collector-base junctions with specified cut-off currents (ICBO ≤ 10 nA at 30 V, 25 °C), ensuring low leakage in standby states. The 3-pin SC-70 layout places emitter (Pin 2) adjacent to base (Pin 1) and collector (Pin 3) opposite - supporting compact common-emitter configurations.

Key Specifications

Pinout & Package

Package: SC-70 (SOT323), plastic surface-mounted, 3-lead package with 0.65 mm lead pitch; dimensions per JEDEC MO-203AA, footprint compatible with automated pick-and-place.

Key Features

Applications

Availability

PMST6428 is available at Aetrix Electronics and suitable for telephony interface design, headset audio amplification, and industrial sensor signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for PMST6428 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 automotive, industrial, computing, and consumer markets.

The PMST6428 belongs to Nexperia's general-purpose bipolar transistor portfolio, designed specifically for cost-sensitive, space-constrained analog signal path applications where reliability and parametric consistency are essential.

FAQ

What is the maximum operating junction temperature for PMST6428?

The absolute maximum junction temperature (T_j) is 150 °C, as defined in the Limiting Values table. Operation above this threshold risks permanent degradation of h_FE and increased leakage. Derating begins at T_amb > 25 °C using R_{th j-a} = 625 K/W on FR4 board.

Is PMST6428 pin-compatible with PMST6429?

Yes - both share identical SC-70 (SOT323) pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector) and mechanical outline. However, PMST6429 has lower V_CEO (45 V) and higher h_FE (500–1250), making it unsuitable as a direct replacement without circuit review.

Does PMST6428 support pulsed operation beyond its DC ratings?

Yes - peak collector current I_CM is rated at 200 mA with pulse width ≤ 300 μs and duty cycle ≤ 2%. This allows short-duration surge handling in transient detection or pulse-shaping circuits, provided average power remains within 200 mW limits.

Can PMST6428 be used in common-base configuration?

Yes - its low C_c (3 pF) and high f_T make it suitable for common-base RF amplifiers. The emitter-base breakdown voltage (V_EBO = 6 V) and low C_e (12 pF) support stable input impedance and wideband response when emitter is AC-grounded.