onsemi MSC2712YT1G

Overview

MSC2712YT1G from onsemi is an NPN general-purpose amplifier transistor in SC-59 surface-mount package, rated for V(BR)CEO = 50 Vdc, IC = 100 mAdc continuous, hFE = 120–240 at IC = 2.0 mAdc/VCE = 6.0 V, and fT = 50 MHz - used in low-power signal amplification stages of portable audio preamps and sensor interface circuits.

For engineers reviewing the MSC2712YT1G datasheet, pinout, applications, or equivalent options, key selection considerations include its hFE binning (Y-grade), SC-59 thermal performance (200 mW PD), VCE(sat) ≤ 0.5 V at IC/IB = 10, and RoHS-compliant Pb-free construction.

Technical Context

This NPN bipolar junction transistor operates in linear amplification mode with guaranteed DC current gain range of 120–240 under standard test conditions (VCE = 6.0 V, IC = 2.0 mAdc). Its 50 MHz fT supports mid-bandwidth analog signal conditioning up to ~10 MHz.

Designed for surface-mount assembly, it features moisture sensitivity level 1 (MSL-1), enabling reflow without baking. The device's safe operating area (SOA) is defined for single-pulse operation up to 100 ms at TA = 25°C, with thermal limit governed by TJ(max) = 150°C and PD = 200 mW.

Key Specifications

Pinout & Package

MSC2712YT1G uses the SC-59 (Case 318D, Style 1) plastic SMT package: 2.90 mm × 1.50 mm × 1.15 mm body with 1.90 mm lead pitch. Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT2222ALT1G and BC847BYT1G, MSC2712YT1G offers optimal balance of 50 V breakdown, MSL-1 reliability, and Y-bin hFE tightness in SC-59 - making it preferred for cost-sensitive, space-constrained 50 V-compatible analog stages where moderate bandwidth suffices.

Availability

MSC2712YT1G is available at Aetrix Electronics and suitable for portable audio preamps, sensor signal amplifiers, LED driver switches, and low-power logic interfaces requiring stable component supply and RoHS-compliant sourcing.

Supply support for MSC2712YT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MSC2712YT1G belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for reliable, low-cost linear amplification and switching in consumer and industrial surface-mount systems.

FAQ

What is the hFE range for MSC2712YT1G and how does it differ from MSC2712GT1G?

The MSC2712YT1G has a guaranteed hFE range of 120–240 at IC = 2.0 mAdc and VCE = 6.0 Vdc, representing the "Y" gain bin. In contrast, MSC2712GT1G is binned to 200–400 ("G" grade). This tighter Y-bin improves gain predictability in production amplifier circuits where consistent biasing is critical, and MSC2712YT1G remains functionally identical otherwise.

Is MSC2712YT1G still recommended for new designs?

No - per onsemi's datasheet (Rev. 8, Jan 2025), MSC2712YT1G is marked DISCONTINUED and not recommended for new designs. However, Aetrix Electronics maintains active inventory and supports legacy production runs. Engineers should consult onsemi for approved replacements if initiating new development, while continuing to use MSC2712YT1G for ongoing manufacturing where qualified.

What package type and pinout does MSC2712YT1G use?

MSC2712YT1G uses the SC-59 package (JEDEC TO-236AB), identical to SOT-23-3. Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector - confirmed in the official marking diagram and mechanical outline. This matches standard SOT-23 footprints, enabling compatibility with existing pick-and-place and reflow tooling.

Does MSC2712YT1G support high-frequency signal amplification?

MSC2712YT1G has an fT of 50 MHz, meaning it can provide useful small-signal gain up to approximately 5–10 MHz depending on bias and load conditions. It is not intended for RF or high-speed digital switching; rather, it targets audio, sensor, and control-loop analog amplification where bandwidth beyond 10 MHz is unnecessary. For such uses, MSC2712YT1G delivers stable, low-distortion performance with predictable hFE.

What are the thermal limitations of MSC2712YT1G in continuous operation?

MSC2712YT1G has a maximum power dissipation (PD) of 200 mW at TA = 25°C and a maximum junction temperature (TJ) of 150°C. Derating is required above 25°C - typically 1.6 mW/°C - so at 85°C ambient, usable PD drops to ~104 mW. Proper PCB copper area and airflow must be verified to keep junction temperature within limit during continuous IC = 100 mAdc operation.