Part Number : 2SB1642

Function: -60V, -4A, PNP Triple Diffused Type Transistor

Package: TO-220 Type

Manufacturer: Toshiba

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Description

The B1642 is a high-power PNP silicon transistor in a TO-220F (or similar) package, designed especially for audio frequency output stages. It supports a collector current up to –4 A and a breakdown voltage of –60 V, and features low saturation voltage for efficient switching. It’s typically used in audio amplifiers, power amplifier stages, and complementary transistor pairs in push-pull outputs.

Features

• Collector–Emitter breakdown voltage V_CEO = –60 V (minimum)
• Collector current (continuous) I_C = –4 A
• Low saturation voltage V_CE(sat) = –1.5 V (max) at I_C = –2.5 A, I_B = –0.25 A
• Wide DC current gain: h_FE = 100 to 320 at moderate currents
• Transition frequency f_T ≈ 9 MHz
• Collector power dissipation P_C = 25 W (at case)
• Collector–Base voltage V_CBO = –60 V
• Emitter–Base breakdown voltage V_EBO = –7 V
• Capacitance (C_ob): ~50 pF (V_CB = –10 V, f = 1 MHz)

Absolute Maximum Ratings (Ta = 25 °C)

Applications

• Output stage in audio power amplifiers (PNP side)
• Complementary transistor in push-pull amplifier topologies
• Driver stage in class AB amplifiers
• Power amplification for speaker drivers and stereo systems
• General PNP high current switching roles in audio circuits

Alternative / Equivalent Products

• 2SB1640 – a close PNP transistor variant with similar specs
• 2SB1667 – alternative PNP transistor in audio designs
• 2SA1943 (if complementary or higher voltage rating required)
• BD140 / BD139 (lower power but common PNP alternatives)
• MJE2955 – another PNP power transistor with somewhat higher voltage headroom

B1642 Datasheet