onsemi 2SC4454R-AC

Overview

2SC4454R-AC from SANYO is an NPN epitaxial planar silicon transistor optimized for high-speed switching applications, featuring a 40 V V_CBO, 150 mA I_C, 300 mW P_C, 450 MHz f_T, and low V_CE(sat) of 0.3 V at I_C/I_B = 10 - used in pulse generators, digital logic interfaces, and small-signal switching circuits.

For engineers reviewing the 2SC4454R-AC datasheet, pinout, applications, or equivalent options, key selection criteria include its 450 MHz gain-bandwidth product, 150 mA collector current rating, 0.3 V saturation voltage, TO-92-compatible package, and verified performance in fast-switching DC-DC converter drivers and logic-level translators.

Technical Context

This transistor employs an epitaxial planar structure to achieve high-speed operation with minimal minority-carrier storage time. Its design emphasizes low output capacitance (C_ob = 0.4 pF at V_CB = 5 V) and high current gain (h_FE = 90–270 at I_C = 10 mA), enabling clean edge transitions in pulse circuits.

The device operates within a junction temperature range of –55°C to +150°C and supports switching times of t_on = 18 ns, t_off = 13 ns, and t_stg = 12 ns under standardized test conditions (V_CC = 3 V, I_C = 10I_B1 = –10I_B2), confirming suitability for sub-20 ns digital signal routing.

Key Specifications

Pinout & Package

2SC4454R-AC is housed in a TO-92 plastic package (SANYO SPA designation), with standard lead configuration and dimensions matching JEDEC TO-92 outline (2.2 mm × 3.0 mm × 3.8 mm body).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SC4454R-AC, the 2SC3838 trades 100 MHz bandwidth for +10 V voltage headroom, while the MPSA18 offers tighter h_FE tolerance and marginal V_CE(sat) improvement - both require revalidation of base drive network due to differing h_FE curves and capacitance profiles.

Availability

2SC4454R-AC is available at Aetrix Electronics and suitable for high-speed logic interfacing, pulse generation, and microcontroller output buffering requiring stable component supply, long-term obsolescence management, and traceable sourcing for industrial automation and embedded instrumentation programs.

Supply support for 2SC4454R-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

SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer known for high-reliability discrete devices and analog ICs before its acquisition by Panasonic in 2011; its transistor portfolio emphasized speed, gain consistency, and ruggedness in industrial environments.

The 2SC4454R-AC belongs to SANYO's high-speed switching transistor family designed specifically for digital signal conditioning, pulse shaping, and low-power driver applications where fast edge rates and low saturation loss are essential.

FAQ

What is the maximum operating junction temperature for the 2SC4454R-AC?

The 2SC4454R-AC has a maximum junction temperature (T_j) of +150°C, as specified in its Absolute Maximum Ratings table. This rating applies under steady-state conditions with proper PCB thermal relief. Derating is required above 25°C ambient - for example, at 85°C ambient, the usable power dissipation drops to approximately 150 mW. Always verify thermal performance in the final layout using the 2SC4454R-AC's thermal resistance data (R_θJA ≈ 417°C/W).

Does the 2SC4454R-AC support direct connection to 3.3 V logic outputs?

Yes, the 2SC4454R-AC can be directly driven by 3.3 V logic outputs when used with appropriate base current limiting. With h_FE ≥ 90 at I_C = 10 mA, a 3.3 V GPIO sourcing 0.3 mA into a 10 kΩ base resistor achieves full saturation. However, ensure the driving source can sink the reverse base current during turn-off to minimize storage time - adding a 10 kΩ base-to-emitter resistor improves switching speed in 2SC4454R-AC applications.

Is the 2SC4454R-AC RoHS compliant?

The 2SC4454R-AC was manufactured prior to mandatory RoHS enforcement in 2006 and contains lead in its solderable leads and internal die attach. It does not meet current RoHS 2 (2011/65/EU) requirements. For new designs requiring RoHS compliance, consider modern equivalents such as the MMBT4401 or DXT751, which replicate the 2SC4454R-AC's electrical behavior while meeting lead-free assembly standards.

What is the typical Cob (collector-base capacitance) of the 2SC4454R-AC at 5 V VCB?

The typical collector-base capacitance (C_ob) of the 2SC4454R-AC is 0.4 pF at V_CB = 5 V and f = 1 MHz, as measured per the device's Electrical Characteristics table. This low value contributes to its 450 MHz f_T and supports clean high-frequency switching. Note that C_ob decreases to ~0.25 pF at V_CB = 10 V, making the 2SC4454R-AC especially effective in cascode or tuned RF amplifier stages.

Can the 2SC4454R-AC be used in linear amplifier configurations?

The 2SC4454R-AC is characterized and optimized for switching operation, not linear amplification. While it exhibits h_FE > 100 and f_T = 450 MHz, its SOA (Safe Operating Area) and linearity parameters (e.g., harmonic distortion, gain flatness) are not specified. Using the 2SC4454R-AC in Class-A amplifiers risks thermal runaway and inconsistent gain - select purpose-built RF transistors like the 2SC3356 or BF199 for verified linear performance.