onsemi BC560CTA

Overview

BC560CTA from ON Semiconductor is a PNP epitaxial silicon transistor optimized for low-noise amplification and general-purpose switching in analog signal paths, with h_FE of 420–800 at −2 mA, V_CEO = −45 V, and noise figure as low as 1.2 dB at 1 kHz. It is commonly used in audio preamplifier stages, sensor interface circuits, and discrete bias networks where stable DC gain and minimal signal degradation are required.

For engineers reviewing the BC560CTA datasheet, pinout, applications, or equivalent options, key selection criteria include its low-noise performance (1.2–2.0 dB), high h_FE tolerance band (Class C), TO-92 package thermal resistance (250 °C/W), and complementary pairing with BC546–BC550 NPN series in push-pull or differential configurations.

Technical Context

The BC560CTA operates as a medium-power, general-purpose PNP bipolar junction transistor with epitaxial base construction enabling improved frequency response and reduced leakage. Its design supports linear amplification up to 150 MHz (f_T) under −10 mA collector current and maintains low V_BE(on) (−600 to −750 mV) across −2 to −10 mA, ensuring predictable turn-on behavior in bias-sensitive circuits.

It shares the same TO-92 3-lead package and absolute maximum ratings (e.g., −45 V V_CEO, −100 mA I_C, 500 mW P_D) with the BC556–BC559 family but is specifically characterized for lowest noise among them-verified at 1.2 dB (typ.) with 2 kΩ source impedance and 200 μA collector current.

Key Specifications

Pinout & Package

BC560CTA is housed in a JEDEC-compliant TO-92 plastic package with straight or bent leads (Ammo packing), featuring 3 terminals arranged in standard emitter-base-collector (E-B-C) order when viewed with flat side facing outward and leads downward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC559CTA and MMBT3906LT1G, BC560CTA delivers superior noise performance (1.2 dB vs. ≥1.2 dB) and higher voltage rating (−45 V vs. −30 V or −40 V), making it the preferred choice for precision analog amplification in −45 V systems requiring stable, low-noise gain.

Availability

BC560CTA is available at Aetrix Electronics and suitable for audio preamplifiers, sensor interface circuits, and discrete bias networks requiring stable component supply, long-term manufacturability, and traceable sourcing.

Supply support for BC560CTA 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and consumer applications.

The BC560CTA belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild and maintained for high-reliability analog signal conditioning and switching in cost-sensitive, non-automotive applications.

FAQ

What is the maximum collector-emitter voltage rating for BC560CTA?

The BC560CTA has a maximum collector-emitter voltage (V_CEO) rating of −45 V. This value is confirmed in the Absolute Maximum Ratings table of the official datasheet and defines the highest reverse voltage the transistor can withstand between collector and emitter while in the off state without risk of breakdown. Exceeding −45 V may cause permanent damage to the BC560CTA.

Does BC560CTA have a specified noise figure, and under what conditions is it measured?

Yes, BC560CTA has a specified noise figure of 1.2–2.0 dB. It is measured at V_CE = −5 V, I_C = −200 μA, f = 1 kHz, and R_G = 2 kΩ, per the Electrical Characteristics table. This low-noise specification distinguishes BC560CTA from earlier variants like BC556 and makes it suitable for sensitive analog front-end applications where signal integrity is critical.

What is the h_FE range for BC560CTA, and how does it compare to other BC5xx PNP transistors?

The BC560CTA is classified as Class C with an h_FE range of 420–800 at V_CE = −5 V and I_C = −2 mA. This is the highest gain band in the BC556–BC560 family-BC556C offers 110–220, BC557C is 200–450-making BC560CTA ideal for applications demanding high, consistent current amplification without external gain adjustment.

Is BC560CTA pin-compatible with BC559CTA or BC557CTA?

Yes, BC560CTA is physically pin-compatible with BC559CTA and BC557CTA, sharing identical TO-92 package dimensions and E-B-C pinout (flat side facing viewer, leads down). However, electrical differences-including V_CEO (−45 V vs. −30 V), noise figure (1.2–2.0 dB vs. 1.2–4.0 dB), and h_FE distribution-require verification in the target circuit before substitution.

What packaging options are available for BC560CTA, and which is used for automated assembly?

BC560CTA is supplied in Ammo packing (tape-and-reel compatible carrier tape), as indicated in the Ordering Information table. This format supports automated pick-and-place assembly in SMT lines. Bulk and tape-and-reel variants exist for other members of the BC5xx family, but BC560CTA specifically uses Ammo packing per the documented part number suffix "TA".