onsemi 2SC3330T-AC

Overview

2SC3330T-AC from Toshiba is an NPN epitaxial planar silicon transistor designed for audio frequency amplification, with DC current gain (h_FE) of 200–400 at I_C = 2 mA, V_CE = 6 V, and maximum collector current (I_C) of 150 mA, used in low-noise preamplifier stages of consumer audio equipment.

For engineers reviewing the 2SC3330T-AC datasheet, pinout, applications, or equivalent options, key selection criteria include h_FE range consistency, V_CEO rating of 50 V, low noise figure (NF = 10 dB typ. at f = 1 kHz), and TO-92MOD package compatibility in discrete AF amplifier designs.

Technical Context

This transistor operates in linear active mode for analog signal amplification, featuring a vertical epitaxial planar structure optimized for stable h_FE across temperature and low base-emitter leakage (I_EO ≤ 0.1 μA). Its junction temperature rating of 150°C supports continuous operation in compact audio enclosures.

The device exhibits uniform gain distribution within the 200–400 h_FE bin (designated by suffix "-AC"), enabling matched-pair use in differential input stages without external trimming, and maintains f_T ≥ 180 MHz to preserve high-frequency response in wideband AF circuits.

Key Specifications

Pinout & Package

Supplied in TO-92MOD plastic package with 1.27 mm lead pitch, 4.5 mm body height, and JEDEC-standard lead form for through-hole PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SC3330T-AC, the 2SC3329T-AC trades voltage and frequency headroom for cost, while KSC1845FTA offers similar voltage rating but looser noise control and non-MOD packaging-making 2SC3330T-AC optimal for noise-critical, space-constrained, and production-matched AF designs.

Availability

2SC3330T-AC is available at Aetrix Electronics and suitable for microphone preamplifiers, phono preamp stages, and portable audio line drivers requiring stable component supply and consistent gain matching across production batches.

Supply support for 2SC3330T-AC 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs with emphasis on reliability, efficiency, and automotive-grade qualification.

The 2SC3330T-AC belongs to Toshiba's legacy AF transistor family, engineered specifically for high-fidelity audio signal amplification in consumer and professional equipment where low noise, gain consistency, and thermal stability are critical.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC3330T-AC?

The 2SC3330T-AC has a maximum collector-emitter voltage (V_CEO) rating of 50 V. This specification defines the highest voltage that can be safely applied between collector and emitter with the base open, ensuring reliable operation in ±24 V or lower single-rail audio amplifier supplies. Exceeding this rating risks avalanche breakdown and permanent device failure.

Does the 2SC3330T-AC have a guaranteed h_FE range, and how is it binned?

Yes, the 2SC3330T-AC is binned to a guaranteed DC current gain (h_FE) range of 200–400 when measured at I_C = 2 mA and V_CE = 6 V. The "-AC" suffix explicitly denotes this gain group, enabling predictable bias design and facilitating matched-pair implementation in differential amplifier circuits without post-manufacture sorting.

What is the noise figure of the 2SC3330T-AC, and under what conditions is it specified?

The 2SC3330T-AC has a typical noise figure (NF) of 10 dB at f = 1 kHz, with I_C = 0.1 mA and V_CE = 6 V. This value reflects its suitability for low-noise small-signal amplification, particularly in first-stage microphone preamplifiers where preserving signal-to-noise ratio is essential. NF increases at higher frequencies and currents, as documented in Toshiba's EN1599A datasheet.

Can the 2SC3330T-AC be used in a common-base configuration, and what are the key considerations?

Yes, the 2SC3330T-AC can be operated in common-base mode for wideband voltage amplification. Key considerations include its V_CB rating of 60 V, input impedance below 100 Ω, and need for stable emitter biasing-often achieved with a constant-current source. The device's f_T ≥ 180 MHz supports bandwidths exceeding 50 MHz in properly terminated configurations, per Toshiba's application guidance in EN1599A.

Is the 2SC3330T-AC RoHS compliant and halogen-free?

Yes, the 2SC3330T-AC is RoHS compliant and halogen-free, meeting JEDEC J-STD-609 Category 1a for bromine/chlorine content and EU Directive 2011/65/EU. Toshiba confirms this status in the material declaration associated with ordering number EN1599A, supporting its use in environmentally regulated consumer audio products shipped globally.