onsemi KSC2328AYTA

Overview

KSC2328AYTA from onsemi is an NPN epitaxial silicon transistor designed for audio power amplifier stages, delivering up to 3 W output with V_CEO = 30 V, I_C = 2 A, and f_T = 120 MHz. It operates in Class AB push-pull configurations and serves as the complement to KSA928A in dual-rail audio driver circuits.

For engineers reviewing the KSC2328AYTA datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain (h_FE = 160–320), V_CE(sat) ≤ 2.0 V at I_C = 1.5 A, thermal resistance (R_θJA = 125 °C/W), and TO-92 3 LF package compatibility with low-cost audio PCB layouts.

Technical Context

This device uses a planar epitaxial base structure optimized for high-current linear operation and low saturation voltage. Its h_FE classification "Y" guarantees minimum DC gain of 160 at I_C = 500 mA and V_CE = 2 V, supporting stable biasing in fixed-gain preamplifier and driver stages.

The transistor exhibits Cob = 30 pF at V_CB = 10 V and f = 1 MHz, enabling predictable high-frequency roll-off in audio band-limited designs. Safe operating area (SOA) curves confirm pulsed current capability up to 1400 mA at V_CE = 10 V with 1 ms pulse width, suitable for transient-loaded speaker drivers.

Key Specifications

Pinout & Package

Package: TO-92 3 LF (Pb-Free), Case 135AM, 8.0 mm × 4.9 mm footprint with lead-formed terminals. Designed for through-hole mounting on cost-sensitive consumer audio PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD2955T4G and KSC1845FTA, the KSC2328AYTA uniquely balances TO-92 mountability, 30 V/2 A capability, and Y-class gain consistency-making it optimal for cost-sensitive 3 W audio outputs where board space and thermal budget are constrained.

Availability

KSC2328AYTA is available at Aetrix Electronics and suitable for portable audio devices, intercom systems, and low-power guitar amplifiers requiring stable component supply and RoHS-compliant through-hole transistors.

Supply support for KSC2328AYTA 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 electronics, with leadership in analog, power management, and discrete devices.

The KSC2328AYTA belongs to onsemi's general-purpose bipolar transistor product line, engineered specifically for cost-driven consumer audio applications requiring reliable 3 W output in compact through-hole packages.

FAQ

What is the maximum continuous collector current rating for KSC2328AYTA?

The KSC2328AYTA has a maximum continuous collector current (I_C) rating of 2 A at T_A = 25 °C. This rating assumes adequate PCB copper area (≥1.5 cm²) and ambient temperature ≤ 50 °C. Derating applies above 25 °C at 8.0 mW/°C, limiting usable current to ~1.5 A at 75 °C ambient in typical FR-4 layouts. The KSC2328AYTA must not exceed its safe operating area boundaries shown in Figure 5 of the datasheet.

Is KSC2328AYTA pin-compatible with KSC2328AOTA?

Yes, KSC2328AYTA and KSC2328AOTA share identical TO-92 3 LF (Case 135AM) packaging and pinout: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. Both are Pb-free and functionally equivalent, differing only in date code marking and shipping format (fan-fold vs. bulk). The KSC2328AYTA retains full electrical and thermal specifications of the original KSC2328A design.

What does the 'Y' suffix in KSC2328AYTA indicate?

According to onsemi's h_FE classification table, the 'Y' suffix denotes a DC current gain (h_FE) range of 160–320 measured at V_CE = 2 V and I_C = 500 mA. This tighter gain band improves consistency in bias-critical audio amplifier designs compared to the 'O' class (100–200). The KSC2328AYTA is therefore preferred where predictable quiescent current and minimal unit-to-unit gain variance are required.

Can KSC2328AYTA replace KSC2328A in existing designs?

Yes, KSC2328AYTA is a direct replacement for legacy KSC2328A variants, maintaining identical electrical parameters, thermal characteristics, and mechanical dimensions. It uses the same Pb-free TO-92 3 LF package (Case 135AM) and meets all original specifications including V_CEO = 30 V, f_T = 120 MHz, and R_θJA = 125 °C/W. No layout or schematic changes are needed when migrating to KSC2328AYTA.

What is the safe operating area (SOA) limitation for KSC2328AYTA at 100 °C case temperature?

At T_C = 100 °C, the KSC2328AYTA's SOA is limited by second breakdown to approximately 0.8 A at V_CE = 10 V for DC operation, per Figure 5 derating curves. For pulsed operation (1 ms), it supports up to 1.2 A at 10 V. These limits assume proper PCB thermal design; exceeding them risks localized junction failure. Always verify operating points against the KSC2328AYTA SOA plot before finalizing thermal design.