onsemi PN2484_D74Z

Overview

PN2484_D74Z from Fairchild Semiconductor is an NPN general-purpose amplifier transistor optimized for low-noise, high-gain signal amplification at collector currents from 1 µA to 50 mA. It features V_CEO = 60 V, I_C = 100 mA continuous, h_FE up to 800 at I_C = 10 mA, and NF = 3.0 dB at 1 kHz - used in preamplifier stages of audio and sensor interface circuits.

For engineers reviewing the PN2484_D74Z datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 radial ammo packaging (EOL code D74Z), verified thermal resistance R_θJA = 357 °C/W on FR-4, and compatibility with low-current analog gain blocks requiring stable h_FE across -55°C to +150°C.

Technical Context

This device operates as a discrete bipolar junction transistor with fixed NPN polarity and base-emitter forward biasing. Its process (Fairchild Process 07) delivers consistent h_FE distribution and low noise figure, validated under pulsed test conditions (≤300 µs, ≤3% duty cycle).

It supports linear amplification in common-emitter configuration with V_CE(sat) = 0.35 V at I_C = 1 mA / I_B = 0.1 mA and V_BE(on) = 0.5–0.7 V at I_C = 100 µA - enabling predictable bias point establishment in DC-coupled small-signal stages.

Key Specifications

Pinout & Package

PN2484_D74Z is supplied in TO-92 radial ammo packaging (EOL code D74Z), with leads arranged in emitter-collector-base order when viewed from flat side with leads down. The package is lead-free and RoHS-compliant per Fairchild documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PN2484_D74Z, MMBT2484 offers smaller footprint but reduced thermal capability, while 2N5088 provides higher guaranteed h_FE at low currents - both require revalidation of bias networks and thermal management in final design.

Availability

PN2484_D74Z is available at Aetrix Electronics and suitable for audio preamplifier stages, sensor signal conditioning, low-power oscillator cores, and interface level shifting requiring stable component supply and long-term manufacturability.

Supply support for PN2484_D74Z 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.

PN2484_D74Z belongs to Fairchild's legacy general-purpose transistor family designed for cost-sensitive, high-reliability analog signal amplification in industrial and consumer electronics.

FAQ

What is the pin configuration of PN2484_D74Z?

PN2484_D74Z uses TO-92 radial ammo packaging with emitter-collector-base lead order when viewed from the flat side with leads pointing downward. This matches the standard TO-92 mechanical orientation defined in Fairchild's Rev B1 tape-and-reel documentation. The D74Z EOL code confirms emitter-first wire-off orientation and bottom-side adhesive tape placement - critical for correct automated placement feed direction.

Is PN2484_D74Z RoHS compliant?

Yes, PN2484_D74Z is RoHS compliant and lead-free, as confirmed by Fairchild Semiconductor's product change notices and packaging specifications for TO-92 devices manufactured under Process 07. The device meets EU Directive 2011/65/EU requirements, with homogeneous material analysis verifying Pb content below 0.1 wt% - essential for compliance in CE-marked industrial and consumer products.

What is the maximum power dissipation for PN2484_D74Z at 75°C ambient?

At 75°C ambient, PN2484_D74Z has a derated power dissipation of 490 mW. This is calculated using its 350 mW rated PD at 25°C and 2.8 mW/°C derating factor: 350 mW − (75 − 25) × 2.8 mW = 490 mW. Exceeding this risks junction temperature exceeding 150°C, potentially degrading h_FE stability or causing permanent damage to the PN2484_D74Z die.

Can PN2484_D74Z replace PN2222A in existing designs?

PN2484_D74Z is not a direct replacement for PN2222A due to differences in h_FE distribution and noise performance: PN2484_D74Z specifies h_FE ≥ 30 at I_C = 1 µA (vs. PN2222A's min 100 at I_C = 10 mA) and NF = 3.0 dB (vs. ~10 dB for PN2222A). Circuit revalidation - especially bias point and noise floor - is required before substituting PN2484_D74Z in PN2222A-based designs.

What does the D74Z suffix indicate for PN2484_D74Z?

The D74Z suffix identifies the specific packaging configuration for PN2484_D74Z: TO-92 radial ammo format with collector-first wire-off orientation, bottom-side adhesive tape, and flat side positioned on top during feeding. This EOL code is documented in Fairchild's TO-92 Tape and Reel Data Rev B, ensuring compatibility with pick-and-place machines calibrated for D74Z carrier dimensions and orientation.