onsemi KSD1616AYTA

Overview

KSD1616AYTA from onsemi is an NPN epitaxial silicon transistor designed for audio frequency power amplification and medium-speed switching applications, with V_CEO = 60 V, I_C = 1 A (DC), h_FE = 135–400 at I_C = 100 mA, f_T = 100–160 MHz, and TO-92-3 LF (Case 135AR) packaging. It serves as a complement to KSB1116/KSB1116A in push-pull amplifier stages.

For engineers reviewing the KSD1616AYTA datasheet, pinout, applications, or equivalent options, key selection considerations include its DC current gain classification (Y = 135–270), saturation voltage performance (V_CE(sat) ≤ 0.30 V at I_C = 1 A), thermal resistance (R_JA = 160 °C/W), and discontinued status requiring supply continuity planning.

Technical Context

This device operates as a general-purpose bipolar junction transistor optimized for linear amplification and switching in low-to-medium power analog circuits. Its 160 MHz f_T, low V_CE(sat), and 1 A continuous collector current support stable operation in Class-A/B audio output stages and relay drivers.

The KSD1616AYTA features Pb-free construction per J-STD-020, uses TO-92-3 LF (Case 135AR) package with standardized leadform, and exhibits complementary pairing with PNP KSB1116 series - enabling matched gain and thermal tracking in differential configurations.

Key Specifications

Pinout & Package

Package: TO-92-3 LF (Case 135AR), Pb-free, through-hole mounting with 4.83 mm × 4.76 mm footprint and standardized leadform per onsemi mechanical drawing 98AON13879G.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KSD1616AYTA, KSD1616AGTA offers higher guaranteed h_FE in the same through-hole package, while MJD1616G provides superior thermal performance in SMT form - both require validation of base drive network and PCB thermal relief for target application reliability.

Availability

KSD1616AYTA is available at Aetrix Electronics and suitable for audio amplifier modules, relay driver circuits, and DC motor control systems requiring stable component supply despite its discontinued status.

Supply support for KSD1616AYTA 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 power and sensing solutions for automotive, industrial, cloud, and IoT applications.

The KSD1616A family belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, medium-power analog and switching functions in consumer and industrial electronics.

FAQ

Is KSD1616AYTA still in production?

No, KSD1616AYTA is officially marked as discontinued per onsemi's February 2026 revision history. While limited legacy stock may be available through authorized distributors, no new manufacturing runs are scheduled. Aetrix Electronics maintains traceable inventory and supports last-time buy planning for KSD1616AYTA to mitigate supply chain disruption for ongoing production.

What does the "Y" suffix in KSD1616AYTA indicate?

The "Y" suffix in KSD1616AYTA denotes the h_FE classification bin: h_FE1 = 135–270 at V_CE = 2 V and I_C = 100 mA. This distinguishes it from the "G" variant (h_FE1 = 200–400). Both share identical absolute maximum ratings, thermal characteristics, and pinout - only DC current gain range differs.

Can KSD1616AYTA replace KSD1616AGTA in existing designs?

Yes, KSD1616AYTA can functionally replace KSD1616AGTA in most circuits, as both share identical package, pinout, voltage/current ratings, and thermal parameters. However, the lower h_FE range (135–270 vs. 200–400) may require verification of base drive sufficiency - especially in low-I_B bias networks or high-temperature operation where h_FE degrades.

What is the maximum power dissipation for KSD1616AYTA at 75°C ambient?

At T_A = 75°C, KSD1616AYTA's maximum power dissipation is 0.45 W. This is calculated using the 6 mW/°C derating factor: PD = 0.75 W − [(75 − 25) × 0.006 W/°C] = 0.45 W. Exceeding this value risks junction temperature exceeding 150°C, potentially triggering thermal runaway or accelerated degradation.

Does KSD1616AYTA support audio-frequency switching above 20 kHz?

Yes, KSD1616AYTA's f_T of 100–160 MHz and measured t_ON/t_F ≤ 70 ns support clean switching well beyond 20 kHz - including Class-D amplifier gate driving and ultrasonic transducer control. However, layout parasitics and base drive strength become critical above 100 kHz; proper PCB grounding and low-inductance base connections are essential for maintaining specified timing performance.