onsemi MSC2712YT1

Overview

MSC2712YT1 from onsemi is an NPN general-purpose amplifier transistor in SC-59 surface-mount package, rated for 50 V_CEO, 100 mA continuous collector current, and 200 mW power dissipation. It delivers h_FE = 120–240 at I_C = 2 mA, V_CE = 6 V, and supports audio preamplifier stages in portable consumer electronics where low-cost, reliable small-signal gain is required.

For engineers reviewing the MSC2712YT1 datasheet, pinout, applications, or equivalent options, key selection criteria include verified h_FE range, V_CE(sat) ≤ 0.5 V at I_C/I_B = 10, f_T ≥ 50 MHz, thermal rating up to 150°C junction temperature, and Pb-free SC-59 package compatibility with reflow soldering profiles.

Technical Context

This device operates as a single NPN bipolar junction transistor optimized for linear amplification and switching in low-power analog signal paths. Its design targets stable DC current gain across −25°C to +100°C, with V_BE(sat) tracking shown in Figure 5 and safe operating area validated for 10 ms pulses per Figure 7.

The SC-59 package (Case 318D, Style 1) defines a fixed pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. Electrical behavior is characterized under pulsed test conditions (≤300 µs, D.C. ≤ 2%) to avoid self-heating artifacts, and leakage currents are specified at multiple bias points including V_CE = 30 V and elevated temperature.

Key Specifications

Pinout & Package

MSC2712YT1 uses the SC-59 package (Case 318D, Style 1), a 3-pin surface-mount plastic SOT-23 variant with dimensions 2.90 × 1.50 × 1.15 mm and 1.90 mm lead pitch. The package is Pb-free, moisture sensitivity level 1, and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSC2712YT1, MBC846BT1G offers higher voltage rating but broader h_FE distribution, while PN2222A provides higher power and lower cost in through-hole form but lacks SC-59 compatibility - making MSC2712YT1 optimal for space-constrained, medium-gain, Pb-free SMT designs requiring tight h_FE control.

Availability

MSC2712YT1 is available at Aetrix Electronics and suitable for audio preamplifier stages, LED driver switches, and logic-level shifter circuits requiring stable component supply and RoHS-compliant manufacturing.

Supply support for MSC2712YT1 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 focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.

The MSC2712YT1 belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for cost-sensitive, high-volume SMT applications demanding reliable small-signal amplification and switching in consumer and industrial electronics.

FAQ

What is the maximum junction temperature specification for MSC2712YT1?

The MSC2712YT1 has a maximum junction temperature (T_J) of 150°C, as confirmed in the Thermal Characteristics table of the official datasheet. This rating applies under steady-state conditions with proper PCB thermal relief and must be derated above 25°C ambient per the device's thermal resistance curve. Designers using MSC2712YT1 should verify board layout copper area and airflow to maintain T_J within this limit during continuous operation.

Does MSC2712YT1 support Pb-free reflow soldering?

Yes, MSC2712YT1 is explicitly marked as Pb-free and RoHS compliant, with moisture sensitivity level (MSL) 1 - meaning it can be subjected to standard lead-free reflow profiles (e.g., JEDEC J-STD-020) without pre-baking. The "G" suffix and optional microdot marking indicate conformance, and the SC-59 package construction is qualified for peak temperatures up to 260°C, as documented in the onsemi packaging specifications.

What is the guaranteed h_FE range for MSC2712YT1 at typical operating conditions?

The guaranteed h_FE range for MSC2712YT1 is 120 to 240, measured at V_CE = 6.0 Vdc and I_C = 2.0 mAdc, per the Electrical Characteristics table. This range is tighter than the MSC2712GT1G variant (200–400) and reflects tighter binning for applications requiring predictable DC gain without feedback compensation. Designers should use the minimum value (120) for worst-case bias calculations.

Is MSC2712YT1 still recommended for new designs?

No - according to the official onsemi datasheet revision 8 (January 2025), MSC2712YT1 is listed as DISCONTINUED and not recommended for new designs. While Aetrix Electronics maintains limited legacy stock, engineers designing new products should consult onsemi for approved replacements such as the MMBT2222ALT1G or NSS20201LT1G, which offer improved performance and active lifecycle support.

What is the pin configuration of MSC2712YT1 in the SC-59 package?

MSC2712YT1 uses SC-59 package Style 1: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector - confirmed in the Mechanical Case Outline diagram and Marking Diagram section of the datasheet. This pinout matches industry-standard SOT-23 NPN orientation and is electrically identical to the MSC2712GT1G variant, enabling shared PCB footprints where gain range permits.