onsemi 2SC4027T-TL-H

Overview

2SC4027T-TL-H from onsemi is an NPN bipolar junction transistor (BJT) designed for general-purpose amplification and switching in low-voltage, medium-current applications. It features a DC current gain (h_FE) of 200–400 at I_C = 2 mA, V_CE = 2 V; maximum collector-emitter voltage (V_CEO) of 50 V; continuous collector current (I_C) rating of 150 mA; and a transition frequency (f_T) of 180 MHz. It is commonly used in audio preamplifier stages, signal buffering, and discrete logic interface circuits.

For engineers reviewing the 2SC4027T-TL-H datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed h_FE range at low bias, TO-236 (SOT-23) package thermal performance, V_CEO margin for 24 V rail operation, and f_T suitability for audio-band and low-MHz digital edge shaping.

Technical Context

This NPN BJT operates with base-emitter forward bias enabling controlled collector current flow proportional to base drive. Its h_FE specification is validated at I_C = 2 mA and V_CE = 2 V, supporting stable small-signal gain in linear amplifier configurations. The device exhibits a typical V_CE(sat) of 0.25 V at I_C = 10 mA and I_B = 1 mA, confirming efficient saturation in switching roles.

Thermal resistance R_θJA is 357°C/W (standard JEDEC PCB mount), limiting power dissipation to ~140 mW at 25°C ambient. The 180 MHz f_T confirms usable bandwidth up to ~10–20 MHz under practical bias conditions, excluding high-frequency RF use.

Key Specifications

Pinout & Package

2SC4027T-TL-H is housed in a TO-236AB (SOT-23) plastic surface-mount package with gull-wing leads, optimized for automated assembly and moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Compared with BC847BW,115 and MMBT3904LT1G, the 2SC4027T-TL-H offers balanced h_FE consistency and 180 MHz bandwidth-ideal for designs needing both predictable DC gain and reliable audio-frequency fidelity without over-spec'ing RF capability.

Availability

2SC4027T-TL-H is available at Aetrix Electronics and suitable for audio signal conditioning, logic interfacing, LED driver circuits, and discrete oscillator designs requiring stable component supply and consistent parametric performance across production batches.

Supply support for 2SC4027T-TL-H 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

onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 2SC4027T-TL-H belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability and parameter consistency in cost-sensitive, medium-performance analog and digital interface circuits.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC4027T-TL-H?

The 2SC4027T-TL-H has a maximum collector-emitter voltage (V_CEO) rating of 50 V. This value is specified under open-base conditions and defines the upper limit for safe DC or peak pulse voltage applied between collector and emitter. Exceeding this rating risks avalanche breakdown and permanent device damage. Designers should maintain at least 20% derating margin-e.g., limit operation to ≤40 V in 24 V systems with transients.

Does the 2SC4027T-TL-H have a guaranteed h_FE range, and at what test conditions?

Yes, the 2SC4027T-TL-H guarantees an h_FE range of 200 to 400. This specification is measured at I_C = 2 mA and V_CE = 2 V, with T_A = 25°C. The tight spread supports robust bias design without individual transistor binning, making it suitable for production-grade amplifiers and switches where gain predictability is essential.

Is the 2SC4027T-TL-H suitable for switching applications, and what is its typical saturation voltage?

Yes, the 2SC4027T-TL-H is well-suited for low-to-medium-speed switching. Its typical collector-emitter saturation voltage (V_CE(sat)) is 0.25 V at I_C = 10 mA and I_B = 1 mA. This low value minimizes conduction loss and self-heating during on-state operation, supporting efficient drive of relays, LEDs, or logic inputs in battery-powered or thermally constrained systems.

What package type does the 2SC4027T-TL-H use, and is it compatible with standard SMT assembly?

The 2SC4027T-TL-H uses the TO-236AB (SOT-23) surface-mount package with three gull-wing leads. It is fully compatible with standard reflow soldering profiles and automated pick-and-place equipment. Pad layout follows JEDEC MO-178AA guidelines, and thermal performance (R_θJA = 357°C/W) assumes minimum copper pour per industry-standard 2-layer PCB footprints.

How does the 2SC4027T-TL-H compare to the MMBT3904 in terms of bandwidth and gain consistency?

The 2SC4027T-TL-H offers higher gain consistency (h_FE = 200–400) versus the MMBT3904 (h_FE = 100–300), while maintaining strong bandwidth (f_T = 180 MHz vs. 300 MHz). Its narrower h_FE range simplifies bias network design, and its 50 V V_CEO provides greater headroom than the MMBT3904's 40 V rating-making the 2SC4027T-TL-H preferable in 24 V industrial interfaces where both gain stability and voltage margin matter.