onsemi SS9015ABU

Overview

SS9015ABU from Fairchild Semiconductor is a PNP epitaxial silicon transistor designed for low-frequency, low-noise amplification in signal conditioning and preamplifier stages. It features hFE of 100–300 (Class B), V_CEO = −45 V, I_C = −100 mA, P_C = 450 mW, and f_T = 100–190 MHz - enabling use in audio front-ends and sensor interface circuits.

For engineers reviewing the SS9015ABU datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package, complementary pairing with SS9014, Class B hFE binning, low noise figure (0.7–10 dB at 1 kHz), and verified DC current gain linearity at I_C = −1 mA to −10 mA.

Technical Context

The SS9015ABU operates as a general-purpose PNP bipolar junction transistor optimized for linear amplification rather than switching. Its design emphasizes low-noise performance (NF = 0.7–10 dB) and stable hFE across collector currents from −0.2 mA to −10 mA, with V_BE(on) = −0.6 to −0.75 V at I_C = −2 mA.

It exhibits low output capacitance (C_ob = 4.5–7.0 pF at V_CB = −10 V), high current gain bandwidth product (f_T up to 190 MHz), and tight saturation voltage control: V_CE(sat) = −0.7 V and V_BE(sat) = −1.0 V at I_C = −100 mA / I_B = −5 mA.

Key Specifications

Pinout & Package

SS9015ABU is housed in a standard through-hole TO-92 package (3.86 mm × 1.27 mm × 4.58 mm), with lead spacing of 1.27 mm and body height ≤ 4.58 mm. Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - confirmed per Fairchild Rev. B2 datasheet mechanical drawing and terminal assignment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal amplifier applications.

Compared with BC557B and MPSA92, the SS9015ABU delivers superior noise performance and higher f_T/C_ob ratio, making it optimal for precision low-frequency amplification where gain consistency and signal fidelity are prioritized over ultra-high voltage or generic switching use.

Availability

SS9015ABU is available at Aetrix Electronics and suitable for audio preamplifier stages, sensor signal conditioning, differential pair inputs, and low-voltage bias generators requiring stable component supply and long-term obsolescence management.

Supply support for SS9015ABU 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 analog, discrete, and power ICs before its acquisition by ON Semiconductor in 2016.

The SS9015ABU belongs to Fairchild's legacy general-purpose BJT family, engineered specifically for low-noise, low-frequency linear amplification in cost-sensitive consumer and industrial electronics.

FAQ

What is the hFE classification for SS9015ABU?

The "B" suffix in SS9015ABU denotes Class B hFE binning: guaranteed DC current gain of 100–300 at V_CE = −5 V and I_C = −1 mA. This classification is explicitly defined in the Fairchild SS9015 Rev. B2 datasheet and distinguishes SS9015ABU from SS9015A (60–150), SS9015C (200–600), and SS9015D (400–1000).

Is SS9015ABU pin-compatible with SS9014?

Yes - SS9015ABU and SS9014 share identical TO-92 packaging and pinout (Emitter-Base-Collector = Pin 1-2-3), and Fairchild explicitly positions them as complementary PNP/NPN pairs. This allows direct use in push-pull, differential, or mirror configurations without PCB layout changes.

What is the maximum operating junction temperature for SS9015ABU?

The absolute maximum junction temperature (T_J) for SS9015ABU is 150°C, as specified in the Fairchild SS9015 Rev. B2 datasheet under Absolute Maximum Ratings. Derating is required above T_A = 25°C per the thermal resistance curve, with P_C decreasing linearly to zero at 150°C ambient in free-air conditions.

Does SS9015ABU support switching applications?

SS9015ABU is characterized and optimized for linear amplification, not switching. While it can operate in saturation (V_CE(sat) = −0.7 V at I_C = −100 mA), its relatively slow turn-off time and lack of switching-specific parameters (e.g., t_f, t_r) in the datasheet indicate it is not intended for high-speed digital or PWM switching roles.

What is the noise figure specification for SS9015ABU?

The noise figure (NF) of SS9015ABU is specified as 0.7–10 dB at f = 1 kHz, V_CE = −5 V, I_C = −0.2 mA, and R_S = 1 kΩ. This low-noise capability is a key differentiator versus general-purpose PNP transistors and confirms its suitability for sensitive analog signal paths.