onsemi BC307_J35Z

Overview

BC307_J35Z from Fairchild Semiconductor is a PNP epitaxial silicon transistor designed for low-noise amplifier and switching applications, with V_CEO = −45 V, I_C = −100 mA, P_C = 500 mW, h_FE = 120–800 (Class A/B/C), and f_T = 130 MHz - used in audio preamplifier stages and relay driver circuits.

For engineers reviewing the BC307_J35Z datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE classification (J35Z denotes Class B: h_FE = 180–460), TO-92 package compatibility, V_CE(sat) ≤ −0.5 V at I_C = −10 mA/I_B = −0.5 mA, and noise figure of 2 dB at 1 kHz.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with fixed emitter-base and collector-emitter breakdown limits. Its DC current gain is classified per h_FE bin (J35Z = Class B), and its low V_BE(on) (−0.55 to −0.7 V) supports efficient base drive in low-voltage logic interfaces.

Designed for linear amplification and digital switching, BC307_J35Z exhibits Cob = 6 pF and Cib = 12 pF at 1 MHz, enabling stable high-frequency operation up to f_T = 130 MHz under specified bias conditions (V_CE = −5 V, I_C = −10 mA).

Key Specifications

Pinout & Package

BC307_J35Z is housed in a standard TO-92 plastic package (3.60 × 4.58 × 14.47 mm), with leads formed for through-hole mounting and JEDEC-standard lead spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC307_J35Z, BC327-40 offers higher h_FE but degrades audio SNR, while PN2907A extends voltage margin at the cost of bandwidth and verified low-noise behavior - BC307_J35Z remains optimal for balanced gain, noise, and speed in compact analog/digital hybrid designs.

Availability

BC307_J35Z is available at Aetrix Electronics and suitable for audio preamplifier stages, relay driver circuits, LED current sink applications, and level-shifting interfaces requiring stable component supply and long-term obsolescence management.

Supply support for BC307_J35Z 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 BC307_J35Z belongs to Fairchild's legacy BC307/308/309 family of general-purpose PNP transistors engineered for cost-sensitive, high-reliability analog and switching functions in consumer and industrial equipment.

FAQ

What does the 'J35Z' suffix indicate in BC307_J35Z?

The J35Z suffix identifies the h_FE gain bin for BC307_J35Z per Fairchild's classification system: Class B, with DC current gain ranging from 180 to 460 at V_CE = −5 V and I_C = −2 mA. This binning ensures predictable base drive requirements and consistent amplification behavior across production units of BC307_J35Z.

Is BC307_J35Z suitable for audio amplifier applications?

Yes, BC307_J35Z is specifically characterized for low-noise operation with a noise figure of 2 dB at 1 kHz, making it appropriate for audio preamplifier stages. Its h_FE stability, low V_BE(on), and f_T = 130 MHz support clean signal amplification without introducing significant distortion or thermal drift in BC307_J35Z-based designs.

What is the maximum continuous collector current for BC307_J35Z?

The maximum continuous collector current (I_C) for BC307_J35Z is −100 mA at T_A = 25°C. Derating is required above ambient temperature - approximately −0.7 mA/°C beyond 25°C - to maintain reliability and prevent thermal runaway in BC307_J35Z circuits.

Can BC307_J35Z replace BC327 in existing designs?

BC307_J35Z is not a direct replacement for BC327 due to differences in h_FE range (BC307_J35Z: 180–460 vs. BC327-40: 250–630) and noise performance (BC307_J35Z: 2 dB vs. BC327: 10 dB). Substitution may require bias network recalibration and noise evaluation - BC307_J35Z should only replace BC327 where low-noise priority outweighs gain headroom in the target BC307_J35Z application.

What package type is used for BC307_J35Z?

BC307_J35Z uses the standard JEDEC TO-92 plastic package with three leads (collector, base, emitter), measuring 3.60 × 4.58 × 14.47 mm. Its pinout is fixed as 1–Collector, 2–Base, 3–Emitter, and it supports through-hole assembly and manual soldering compatible with legacy BC307_J35Z board layouts.