onsemi BC547BTAR

Overview

BC547BTAR from ON Semiconductor is an NPN epitaxial silicon transistor designed for general-purpose switching and low-noise amplification in discrete analog circuits. It features V_CEO = 45 V, I_C = 100 mA, h_FE = 200–450 (Class B), f_T = 300 MHz, and TO-92 package with emitter-base voltage rating of 6 V - commonly used in audio preamplifiers, sensor interface stages, and digital logic level translation.

For engineers reviewing the BC547BTAR datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain classification (B-grade), saturation voltage at 10 mA/0.5 mA drive, noise figure under 200 µA bias, and compatibility with legacy BC-series PCB footprints requiring through-hole TO-92 placement.

Technical Context

This device operates as a medium-speed, low-power bipolar junction transistor optimized for linear amplification and saturated switching. Its epitaxial base construction enables stable h_FE across temperature and consistent V_BE(on) of 580–700 mV at 2 mA collector current.

The BC547BTAR belongs to the BC546–BC550 family sharing identical TO-92 mechanical form factor and pinout (C-B-E), but differentiated by voltage ratings and h_FE bins: BC547B offers balanced performance between breakdown voltage (45 V) and gain (200–450), unlike BC546B (65 V, lower gain) or BC549B (30 V, low-noise).

Key Specifications

Pinout & Package

BC547BTAR uses the standard JEDEC TO-92 3-lead plastic package with straight leads (bulk/ammo/tape-and-reel variants). Dimensions comply with TO-92 outline drawing per Fairchild Rev. 1.1.1 (2014). Pin identification is fixed: Lead 1 = Collector, Lead 2 = Base, Lead 3 = Emitter - verified across all BC546–BC550 family datasheets and ON Semiconductor packaging documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC547BTA, BC547BTAR offers identical performance in tape-and-reel delivery for automated manufacturing; versus PN2222A, BC547BTAR provides superior noise performance and tighter h_FE control at lower saturation voltage - critical for precision analog and low-power digital interface designs.

Availability

BC547BTAR is available at Aetrix Electronics and suitable for audio preamplifiers, sensor signal conditioning circuits, and digital logic level translation requiring stable component supply across industrial, consumer, and automotive auxiliary systems.

Supply support for BC547BTAR 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 cloud power applications.

The BC547BTAR belongs to ON Semiconductor's legacy general-purpose transistor product line, originally developed by Fairchild and maintained for backward compatibility in cost-sensitive, high-volume analog and interface designs.

FAQ

What is the pin configuration of BC547BTAR?

The BC547BTAR uses a standard TO-92 package with fixed pinout: Lead 1 is Collector, Lead 2 is Base, and Lead 3 is Emitter - confirmed in Fairchild's BC546–BC550 datasheet Rev. 1.1.1 and maintained in ON Semiconductor's cross-reference documentation. This configuration is consistent across all BC546–BC550 variants and enables direct substitution in existing TO-92 layouts.

What does the 'TAR' suffix mean in BC547BTAR?

The 'TAR' suffix in BC547BTAR indicates Tape-and-Reel packaging per EIA-481 standard, with 2,000 units per reel - distinct from 'TA' (ammo pack) or 'BU' (bulk) variants. This format is optimized for automated SMT placement equipment and ensures controlled static discharge handling during manufacturing, as specified in ON Semiconductor's packaging guidelines for legacy Fairchild devices.

Is BC547BTAR RoHS compliant?

Yes, BC547BTAR is RoHS compliant and meets Directive 2011/65/EU requirements, including lead-free terminations and halogen-free molding compound. ON Semiconductor confirms full compliance for this part number in its official product change notices and material declarations, with exemptions applied only where permitted under Annex III of the directive.

How does BC547BTAR differ from BC547BTA?

BC547BTAR and BC547BTA share identical silicon die, electrical specifications, and TO-92 mechanical dimensions - the sole difference is packaging: BC547BTAR is supplied in tape-and-reel format (2,000/reel), while BC547BTA uses ammo packaging. Both are Class B h_FE (200–450) devices with V_CEO = 45 V and f_T = 300 MHz, making them functionally interchangeable where packaging permits.

Can BC547BTAR replace BC547C in a circuit?

BC547BTAR (Class B, h_FE = 200–450) is not a direct replacement for BC547C (Class C, h_FE = 420–800) without circuit validation. Higher h_FE in BC547C may cause unintended bias shift or instability in high-gain amplifier stages. Use BC547BTAR only where gain tolerance allows 200–450 range, or recalculate base resistors to maintain operating point integrity.