onsemi 2SC4159D

Overview

2SC4159D from SANYO is an NPN epitaxial planar silicon transistor designed for high-voltage switching and audio-frequency power amplification, with V_CEO = −160 V, I_C = −1.5 A, P_C = 115 W at T_C = 25 °C, f_T = 100 MHz, and h_FE ≥ 200 at I_C = −0.5 A, V_CE = −5 V - used in 100 W output predriver stages of solid-state audio amplifiers.

For engineers reviewing the 2SC4159D datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (TO-220ML), terminal roles (Emitter/Collector/Base), absolute maximum ratings, switching timing data (t_on = 0.22 µs, t_f = 0.48 µs), and application-specific thermal derating curves.

Technical Context

The 2SC4159D operates as a high-voltage, medium-power NPN switching transistor with a micaless TO-220ML package enabling direct heatsink mounting. Its −160 V V_CEO rating and 115 W power dissipation support robust operation in Class AB audio output stages and DC-DC converter primary-side switches.

It exhibits f_T = 100 MHz at I_C = −50 mA, V_CE = −10 V, confirming suitability for fast-switching applications up to several MHz; V_CE(sat) = −1.0 V max at I_C = −1.5 A, I_B = −0.15 A ensures low conduction loss in saturated switching mode.

Key Specifications

Pinout & Package

Package: TO-220ML (micaless, single-ended heat-transfer variant of TO-220 with metal tab isolated from collector).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching applications.

Compared with 2SC4159D, 2SC3854 offers reduced voltage and power headroom but identical pinout and thermal footprint, while MJE13009 delivers superior voltage rating and current capacity at the cost of less precise h_FE control and higher switching losses in linear AF applications.

Availability

2SC4159D is available at Aetrix Electronics and suitable for high-voltage audio amplifier output stages, industrial DC-DC converter primary switches, and AF pre-driver circuits requiring stable component supply, long-lifecycle continuity, and traceable sourcing.

Supply support for 2SC4159D 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

SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer specializing in power transistors, analog ICs, and optoelectronics before its acquisition by Panasonic in 2012; known for rugged, high-reliability discrete devices.

The 2SC4159D belongs to SANYO's high-voltage NPN transistor family engineered specifically for audio-frequency power amplification and industrial switching - emphasizing thermal robustness, consistent h_FE, and fast switching in TO-220ML packaging.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC4159D?

The 2SC4159D has a maximum collector-emitter voltage rating (V_CEO) of −160 V at T_A = 25 °C. This rating applies under open-base conditions and defines the upper limit for safe DC or repetitive pulse operation. Exceeding this voltage - even momentarily - risks irreversible avalanche breakdown. Derating is required above 25 °C ambient, per the published thermal curve in the official SANYO datasheet No.2535.

Is the 2SC4159D pin-compatible with the 2SA1606 PNP counterpart?

Yes, the 2SC4159D and 2SA1606 share identical TO-220ML packaging and pinout: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter. This allows direct complementary placement in push-pull amplifier output stages. However, polarity reversal must be observed in circuit layout - the 2SC4159D handles positive half-cycles while the 2SA1606 handles negative half-cycles - and both require matched h_FE bins for optimal crossover distortion performance.

What is the typical DC current gain (h_FE) of the 2SC4159D at operating conditions?

The 2SC4159D exhibits h_FE = 200–600 when measured at I_C = −0.5 A and V_CE = −5 V, Ta = 25 °C. This wide range reflects factory binning; units labeled "D" suffix (as in 2SC4159D) are sorted to the 200–600 group. For stable biasing in linear applications, designers should assume h_FE(min) = 200 and verify quiescent current across temperature using emitter degeneration resistors.

Does the 2SC4159D require electrical isolation from the heatsink?

Yes - the collector (Pin 2) is internally connected to the metal tab in the TO-220ML package. Therefore, the 2SC4159D must be mounted to the heatsink using an electrically isolating pad (e.g., silicone thermal pad with dielectric strength ≥2 kV) unless the heatsink is intentionally referenced to the collector potential. Failure to isolate may cause short circuits in grounded-chassis systems or violate safety insulation requirements.

What are the key thermal limitations affecting continuous operation of the 2SC4159D?

The 2SC4159D has a maximum junction temperature (T_j(max)) of 150 °C and a storage temperature range of −55 °C to +150 °C. Its 115 W power dissipation rating applies only at T_C = 25 °C; derating is linear at −0.92 W/°C above 25 °C. To sustain continuous operation, the heatsink must maintain T_C ≤ 75 °C for 70 W dissipation - requiring thermal resistance ≤ 0.71 °C/W including interface materials and airflow.