onsemi PN4250_D75Z

Overview

PN4250_D75Z from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor (BJT) designed for amplification and switching in low-to-medium power circuits, with V_CEO = 40 V, I_C = 500 mA continuous, h_FE = 250–700 at I_C = 100 µA, and TO-92 package. It serves in signal conditioning, discrete logic interfaces, and load switching up to 300 mA collector current.

For engineers reviewing the PN4250_D75Z datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, TO-92 mechanical configuration (D75Z ammo pack variant), DC current gain range, saturation voltage under defined drive conditions, and thermal resistance (R_θJA = 200 °C/W).

Technical Context

The PN4250_D75Z operates as a silicon PNP BJT fabricated using Fairchild's Process 68, optimized for general-purpose linear amplification and saturated switching. Its design supports stable DC biasing with h_FE specified at V_CE = 5.0 V and I_C = 100 µA, and low V_CE(sat) = 0.25 V at I_C = 10 mA / I_B = 0.5 mA.

Thermal performance is defined by R_θJC = 83.3 °C/W and R_θJA = 200 °C/W, enabling operation across –55 °C to +150 °C junction temperature. All absolute maximum ratings-including V_CEO, V_CB, V_EB, and P_D = 625 mW-are validated at T_A = 25 °C with derating above that ambient.

Key Specifications

Pinout & Package

PN4250_D75Z is supplied in the TO-92 plastic package, with lead configuration per D75Z ammo pack specification: flat side of transistor faces upward, first wire off is collector, adhesive tape on top side.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose amplifier applications.

Compared with PN4250_D75Z, MPSA92 offers superior voltage headroom but reduced gain predictability, while BC557 provides improved gain spread and lower saturation voltage-making it preferable for precision biasing or low-loss switching where V_CEO margin permits.

Availability

PN4250_D75Z is available at Aetrix Electronics and suitable for relay drivers, discrete logic translators, audio pre-amplifiers, and current mirror references requiring stable component supply and TO-92-compatible manufacturing flow.

Supply support for PN4250_D75Z 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The PN4250_D75Z belongs to Fairchild's general-purpose PNP BJT product line, engineered for cost-sensitive, medium-current amplification and switching in consumer, industrial, and automotive auxiliary circuits.

FAQ

What is the pin configuration for PN4250_D75Z in the TO-92 package?

The PN4250_D75Z uses the standard TO-92 outline with emitter-base-collector (E-B-C) pin order when viewed with the flat side facing up and leads pointing downward. Per D75Z packaging specification, the first wire off is the collector, confirming this orientation is maintained in the ammo pack delivery format. Always verify physical orientation before PCB layout or assembly.

Does PN4250_D75Z support switching applications up to 300 mA?

Yes, PN4250_D75Z is explicitly rated for collector currents up to 300 mA in switching applications, with absolute maximum I_C = 500 mA continuous. Its V_CE(sat) ≤ 0.25 V at I_C = 10 mA / I_B = 0.5 mA and P_D = 625 mW ensure reliable operation at 300 mA when properly heatsinked or operated within ambient thermal limits.

What is the maximum operating junction temperature for PN4250_D75Z?

The maximum operating junction temperature for PN4250_D75Z is +150 °C, as defined in its Absolute Maximum Ratings table. This limit applies under steady-state conditions; pulsed or low-duty-cycle operation may require consultation with Fairchild's application engineering team per Note 2 in the original datasheet.

Is PN4250_D75Z RoHS compliant?

PN4250_D75Z was manufactured prior to full RoHS enforcement and does not carry explicit RoHS certification in its original documentation. For compliance-critical designs, Aetrix Electronics recommends verifying material declarations via ON Semiconductor's legacy part cross-reference portal or selecting a modern RoHS-compliant PNP BJT such as the NSS60201LT1G as an alternative.

How does the h_FE variation affect bias design for PN4250_D75Z?

The h_FE range of 250–700 for PN4250_D75Z means base current must be sized for the minimum gain (250) to guarantee saturation in switching use, or emitter degeneration added in amplifier configurations to stabilize Q-point against unit-to-unit variation. Designers should avoid fixed-base bias topologies relying on nominal h_FE without margin.