onsemi 2SC3598E

Overview

2SC3598E from SANYO is an NPN epitaxial planar silicon transistor designed for high-frequency video output stages in ultrahigh-definition CRT displays and color TV chroma circuits. It delivers f_T = 500 MHz (typ), V_CEO ≥ 120 V, C_re = 1.6 pF at V_CB = –30 V / f = 1 MHz, P_C = 1.2 W (T_c = 25 °C), and h_FE = 40–120 at I_C = –10 mA / V_CE = –10 V.

For engineers reviewing the 2SC3598E datasheet, pinout, applications, or equivalent options, key selection criteria include high-voltage video switching capability, low reverse transfer capacitance for wideband stability, complementary pairing with 2SA1404, FBET process reliability, and TO-126 thermal performance in analog video driver designs.

Technical Context

The 2SC3598E employs SANYO's FBET (Flat Base Epitaxial Transistor) process to achieve tight parameter distribution and superior high-frequency linearity. Its V_CEO ≥ 120 V and low C_re (1.6 pF) enable stable operation in CRT deflection and chroma amplification where fast edge fidelity and voltage headroom are critical.

Designed as a complementary NPN counterpart to the 2SA1404 PNP transistor, the 2SC3598E supports push-pull video output configurations with matched gain-bandwidth and breakdown characteristics. Absolute maximum ratings specify T_j ≤ 150 °C and storage range from –55 °C to +150 °C.

Key Specifications

Pinout & Package

2SC3598E is housed in a SANYO TO-126 plastic package (standard JEDEC TO-126 outline), featuring integral heat-dissipating tab and through-hole mounting. The case is electrically connected to the collector terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SC3598E, the 2SC3866 trades bandwidth for higher voltage safety margin, while the 2SC4027 offers marginal RF performance gains at tighter gain consistency-both require validation of TO-126 footprint compatibility and thermal derating curves in target video layouts.

Availability

2SC3598E is available at Aetrix Electronics and suitable for ultrahigh-definition CRT display manufacturing, color TV chroma output modules, and wideband analog video amplifier designs requiring stable component supply and long-lifecycle support.

Supply support for 2SC3598E 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 analog and power devices for consumer electronics, particularly video, audio, and power management ICs and discrete transistors.

The 2SC3598E belongs to SANYO's high-frequency video transistor product line, engineered specifically for CRT-based display systems demanding high-voltage linearity, wide bandwidth, and thermal robustness in analog video signal paths.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC3598E?

The 2SC3598E has a guaranteed minimum V_CEO rating of 120 V under DC conditions at T_a = 25 °C. This rating ensures safe operation in CRT video output stages where peak anode-related voltages may exceed 100 V. Exceeding this voltage-even momentarily-may cause irreversible breakdown. Always observe derating curves for elevated ambient or case temperatures when applying the 2SC3598E in production designs.

Does the 2SC3598E have a complementary PNP counterpart?

Yes, the 2SC3598E is explicitly designed as the NPN complement to the 2SA1404 PNP transistor. Both share matched absolute maximum ratings (including V_CEO/V_ECO ≥ 120 V), similar f_T (500 MHz typ), and compatible h_FE ranges. Their paired use in push-pull video output stages ensures balanced slew rate, minimized crossover distortion, and symmetrical thermal behavior-critical for high-fidelity analog video reproduction using the 2SC3598E.

What is the typical gain-bandwidth product (f_T) of the 2SC3598E and under what conditions is it measured?

The 2SC3598E exhibits a typical f_T of 500 MHz, measured at V_CE = –10 V and I_C = –50 mA per SANYO specification No.1763. This value reflects the transistor's intrinsic high-frequency capability and directly determines usable bandwidth in video amplifier configurations. Designers should verify small-signal gain flatness and phase margin in their specific circuit layout, as parasitic capacitances and layout inductance can reduce effective bandwidth below the 2SC3598E's rated f_T.

How is thermal performance characterized for the 2SC3598E in its TO-126 package?

The 2SC3598E's TO-126 package delivers 1.2 W collector dissipation at T_c = 25 °C, with derating to zero at T_c = 150 °C. Its thermal resistance from junction-to-case (R_θJC) is not explicitly published, but typical TO-126 R_θJC values fall near 15–20 °C/W. For reliable operation, mount the 2SC3598E with the collector-tab thermally coupled to a copper pour or heatsink, and avoid exceeding T_j = 150 °C-verified via case temperature measurement and derating per the published P_C vs. T_c curve.

Is the 2SC3598E suitable for life-support or aviation-critical systems?

No. Per SANYO documentation (Spec No.1763), the 2SC3598E is not qualified for applications requiring extremely high reliability-such as life-support systems, aircraft control, or other functions where failure could cause serious physical or material damage. The 2SC3598E is intended for consumer video equipment like CRT displays and TVs. Engineers must consult SANYO's official representative before considering the 2SC3598E in safety-critical designs, and no reliability data beyond standard commercial-grade testing is provided for the 2SC3598E.