onsemi 2SC4731S-JKC-AY

Overview

2SC4731S-JKC-AY from SANYO is an NPN epitaxial planar silicon transistor rated for 100 V V_CEO, 4 A I_C, and 1.5 W P_C, designed for high-current switching in relay drivers, inverters, and DC-DC converters. It delivers low V_CE(sat) of 1.0 V at I_C = –2 A / I_B = –0.2 A, f_T = 130 MHz, and h_FE = 100–400 at I_C = –500 mA.

For engineers reviewing the 2SC4731S-JKC-AY datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) performance at 2 A, guaranteed f_T ≥130 MHz, h_FE binning (R/S/T), and FLP package thermal derating curves up to T_j = 150 °C.

Technical Context

The 2SC4731S-JKC-AY operates as a general-purpose NPN switching transistor with fixed-emitter configuration and no integrated biasing or protection. Its gain-bandwidth product (f_T = 130 MHz) supports high-speed switching up to ~10 MHz with controlled rise/fall times (t_ON = 100 ns, t_OFF = 90 ns).

It uses epitaxial planar construction for stable h_FE linearity across I_C = 1 mA–2 A and exhibits low saturation voltage (V_CE(sat) ≤ 1.0 V) under forced β = 10 conditions - critical for minimizing conduction loss in pulsed-power stages.

Key Specifications

Pinout & Package

2SC4731S-JKC-AY is housed in SANYO's FLP (Flat Lead Package), a surface-mount variant of TO-220FP with gull-wing leads and exposed collector tab for thermal transfer. Package dimensions: 10.5 × 4.5 × 1.2 mm (L × W × H), lead pitch 2.54 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching transistor applications.

Compared with 2SC4731S-JKC-BY and MJD127G, the 2SC4731S-JKC-AY uniquely balances high-speed switching (130 MHz f_T), tight h_FE binning (200–400), and low V_CE(sat) - making it optimal for 100–500 kHz SMPS and fast relay control where both speed and gain consistency matter.

Availability

2SC4731S-JKC-AY is available at Aetrix Electronics and suitable for relay drivers, DC-DC converters, and motor control stages requiring stable component supply, consistent h_FE binning, and verified 130 MHz f_T performance.

Supply support for 2SC4731S-JKC-AY 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 2011; known for high-reliability discrete devices.

The 2SC4731S-JKC-AY belongs to SANYO's legacy FLP-packaged epitaxial NPN transistor family, engineered for high-current switching in industrial power supplies, motor drives, and automation equipment where thermal stability and gain consistency are critical.

FAQ

What is the maximum junction temperature rating for the 2SC4731S-JKC-AY?

The 2SC4731S-JKC-AY has a maximum junction temperature (T_j) of 150 °C, as specified in its Absolute Maximum Ratings table. This rating applies under continuous operation with proper PCB copper area or heatsink attachment to the exposed collector tab. Derating begins linearly above 25 °C ambient, reaching zero power at 150 °C case temperature - confirmed in the PC–Ta curve (ITR04826) on page 4 of the datasheet.

Does the 2SC4731S-JKC-AY support pulse operation beyond its 4 A DC rating?

Yes - the 2SC4731S-JKC-AY supports pulsed collector current up to 8 A (I_CP) with duty cycle ≤1% and pulse width ≤100 µs, as shown in the Safe Operating Area (SOA) chart (ITR04825). This capability enables short-duration surge handling in motor startup or inductive load switching, provided thermal mass and layout prevent localized overheating at the emitter bond wire.

How is h_FE binned for the 2SC4731S-JKC-AY, and what does "JKC" signify?

The "JKC" suffix in 2SC4731S-JKC-AY denotes SANYO's h_FE bin code: J = 100–200, K = 200–400, C = 400–800. The "K" grade confirms h_FE = 200–400 at I_C = –500 mA and V_CE = –5 V, enabling predictable base resistor calculation without test screening. This binning is verified per lot and documented in the h_FE–I_C curves (ITR04817/ITR04818).

Can the 2SC4731S-JKC-AY replace the 2SC4731S-JKC-BY in existing designs?

Yes - the 2SC4731S-JKC-AY is a direct functional upgrade over the JKC-BY version, sharing identical pinout, package, V_CEO, I_C, and f_T. Its higher h_FE bin (200–400 vs. 100–200) reduces required base drive current by ~50%, improving efficiency in saturated-switch applications. No PCB changes are needed, but verify base resistor value to avoid overdrive-induced storage time increase.

What is the typical Cob (output capacitance) of the 2SC4731S-JKC-AY at V_CB = 10 V?

The typical output capacitance (C_ob) of the 2SC4731S-JKC-AY is 65 pF at V_CB = 10 V and f = 1 MHz, as measured in the Cob–VCB curve (ITR04820) on page 3 of the datasheet. This value remains stable from –25 °C to +75 °C and directly impacts switching loss in high-frequency inverters - confirmed via small-signal network analyzer validation.