onsemi PN5134

Overview

PN5134 from Fairchild Semiconductor is an NPN general-purpose bipolar junction transistor (BJT) designed for low-power amplification and switching applications, with V_CEO = 10 V, I_C = 500 mA continuous, h_FE = 20–150 at I_C = 10 mA, V_CE(sat) = 0.20–0.25 V, and TO-92 package. It serves in signal conditioning stages of consumer audio preamps and low-side load switches in 3.3 V/5 V logic-controlled circuits.

For engineers reviewing the PN5134 datasheet, pinout, applications, or equivalent options, key selection considerations include its 10 V collector-emitter breakdown rating, 500 mA DC current capability, 0.20 V low saturation voltage at I_B = 3.3 mA, thermal resistance of 200 °C/W, and suitability for general-purpose linear and switching use below 100 MHz.

Technical Context

The PN5134 operates as a silicon NPN BJT optimized for DC-coupled amplification and saturated-switching roles. Its h_FE range (20–150), low V_CE(sat) (0.20–0.25 V), and fast switching times (t_on/t_off ≈ 18 ns each) support stable gain control and efficient on/off transitions in low-voltage digital interfaces.

Thermal design is constrained by R_θJA = 200 °C/W and P_D = 625 mW at 25 °C, derating linearly above ambient. The device meets JEDEC TO-92 mechanical standards with defined lead spacing (1.27 mm pitch) and body dimensions (4.58 × 3.60 × 14.47 mm).

Key Specifications

Pinout & Package

Package: TO-92 - Three-lead through-hole plastic package with standard 1.27 mm lead pitch, 4.58 mm body width, and 14.47 mm overall length. Compliant with JEDEC TO-92 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC547B and MPSA18, the PN5134 offers lower V_CEO but superior switching speed and identical thermal performance, making it optimal for compact 3.3 V/5 V digital switching where voltage headroom is constrained and timing precision matters.

Availability

PN5134 is available at Aetrix Electronics and suitable for audio pre-amplifiers, LED drivers, relay interface circuits, and logic-level translators requiring stable component supply and long-term obsolescence management.

Supply support for PN5134 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 manufacturer specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016.

The PN5134 belongs to Fairchild's general-purpose bipolar transistor product line, engineered for cost-sensitive, low-to-medium frequency amplification and switching in consumer, industrial, and computing applications.

FAQ

What is the maximum continuous collector current rating for PN5134?

The PN5134 has a maximum continuous collector current (I_C) rating of 500 mA at T_A = 25 °C. This value decreases with rising ambient temperature due to thermal derating-5.0 mW/°C above 25 °C-and must be verified against actual board-level thermal conditions. The PN5134 achieves this rating within its 625 mW total power dissipation limit and TO-92 package constraints.

Does PN5134 support switching applications, and what are its key timing parameters?

Yes, the PN5134 supports switching applications with documented t_on, t_off, t_r, and t_f all ≤ 18 ns under specified test conditions (V_CC = 3.0 V, I_C = 10 mA). These values confirm suitability for PWM control up to several MHz. The PN5134's fast storage time (t_s = 13–18 ns) and low V_CE(sat) make it effective in digital output buffering and LED dimming circuits.

What is the DC current gain (h_FE) range of PN5134, and how does it vary with operating conditions?

The PN5134 exhibits h_FE = 20–150 at V_CE = 1.0 V and I_C = 10 mA, and h_FE = 15–150 at V_CE = 0.4 V and I_C = 30 mA. Gain decreases at higher currents and lower V_CE; design margins should account for this spread. The PN5134's wide h_FE range allows robust base resistor selection across manufacturing lots without performance drift.

Can PN5134 be used in place of BC547 in existing designs?

The PN5134 shares the TO-92 package and pinout (E-B-C) with BC547, but differs in V_CEO (10 V vs. 45 V) and h_FE range (20–150 vs. 200–450). Substitution is viable only if circuit voltage stress remains ≤10 V and gain tolerance accommodates lower minimum h_FE. The PN5134 is not a drop-in replacement for BC547 in 12 V or higher supply applications.

What is the thermal resistance of PN5134, and how does it impact PCB layout?

The PN5134 has R_θJA = 200 °C/W, meaning junction temperature rises 200 °C per watt dissipated without heatsinking. At 300 mW, ΔT ≈ 60 °C-requiring careful copper area allocation or airflow. Layouts should maximize copper pour under the emitter pad and avoid thermal isolation. The PN5134's thermal performance is consistent with standard TO-92 footprints but demands verification for >250 mW sustained loads.