BC557B
Bipolar (BJT) Single Transistor, PNP, 45 V, 100 mA, 500 mW, TO-92, Through Hole
- Manufacturer: MULTICOMP PRO
- Product type:
- Transistor Polarity:PNP; Collector Emitter Voltage V(br)ceo:45V; Transition Frequency ft:150MHz; Power Dissipation Pd:625mW; DC Collector Current:100mA; DC Current Gain hFE:200hFE; Tran
- MSL: -
- SVHC: No SVHC (25-Jun-2025)
- No. of Pins: 3Pins
- Product Range: -
- Qualification: -
- Power Dissipation: 500mW
- Transistor Mounting: Through Hole
- Transistor Polarity: PNP
- Transition Frequency: 150MHz
- Transistor Case Style: TO-92
- DC Current Gain hFE Min: 200hFE
- Operating Temperature Max: 150°C
- Continuous Collector Current: 100mA
- Collector Emitter Voltage Max: 45V
| Delivery and price | |
|---|---|
| Units per pack | 5000 |
| Price | 0.052 € |
| Current stock | 1000+ |
| Lead time | 30 days |
## **General Purpose Transistor** **Pin Configuration:** 1. Emitter 2.�Base 3.�Collector ## **Features:** - PNP Silicon Planar Epitaxial Transistor Especially Suited For use in Driver Stages of Audio Amplifiers, Low Noise Input Stages of Tape Recorders, HI-FI�Amplifiers,�Signal�Processing�Circuits�of�Television�Receivers ## **Absolute Maximum Ratings** |**Absolute Maximum Ratings**|||| |---|---|---|---| |**Parameters**|**Symbol**|**Rating**|**Unit**| |Collector-Emitter�Voltage|VCEO|45|V| |Collector-Emitter�Voltage|VCES|50|| |Collector-Base�Voltage|VCBO||| |Emitter-Base�Voltage|VEBO|5|| |Collector�Current�Continuous�Peak|IC<br>ICM|100<br>200|mA| |Base�Current�Peak|IBM|200|| |Emitter�Current�Peak|IEM||| |Power�Dissipation�at�Ta�=�25°C�<br>Derate�above�25°C|PTA|500<br>4|mW<br>mW/°C| |Storage Temperature|Tstg|-65�to�+150|°C| |Junction Temperature|Tj|150|| Newark.com/multicomp-pro Farnell.com/multicomp-pro Element14.com/multicomp-pro Page <1> 17/09/19 V1.0 ## **General Purpose Transistor** ## **Electrical Characteristics (Ta = 25°C unless otherwise specified)** |**Parameters**|**Symbol**|**Test Condition**|**Rating**|**Unit**| |---|---|---|---|---| |Collector-EmitterVoltage|VCEO|IC=2mA,IB= 0|>45|V| |Collector-BaseVoltage|VCBO|IC=100µA,IE= 0|>50|| |Emitter-BaseVoltage|VEBO|IE=100µA,IC= 0|>5|| |Collector-CutoffCurrent|ICBO<br>ICES|VCB=30V,IE= 0<br>Tj=150°C<br>VCB=30V,IE= 0<br>VCE=80V,VBE= 0|<15<br><5<br><15|nA<br>µA<br>nA| |Collector-CutoffCurrent|ICES|TJ=125°C<br>VCE=80V,VBE= 0|<4|µA| |DCCurrentGain|hFE|IC=10µA,VCE=5V<br>**BC557B**<br>**BC557B**<br>IC=100mA,VCE=5V<br>**BC557B**|Typical 150<br>200-450<br>Typical 200|-| |CollectorEmitterSaturationVoltage|VCE(Sat)|IC=10mA,IB= 0.5mA<br>IC=100mA,IB= 5mA|<0.30<br><0.65|V| |BaseEmitterSaturationVoltage|VBE(sat)|IC=10mA,IB= 0.5mA<br>IC=100mA,IB= 5mA|Typical 0.70<br>Typical 0.90|| |BaseEmitteronVoltage|VBE(on)|IC=2mA,VCE=5V<br>IC=10mA,VCE=5V|0.55-0.70<br><0.82|| |**Dynamic Characteristics**||||| |Transition Frequency|fT|IC=10mA,VCE=5V<br>f=100MHz|Typical 150|MHz| |CollectoroutputCapacitance|Ccbo|VCB=10V,f=1MHz|<6|pF| |EmitterInputCapacitance|Cib|VEB=0.5V,f=1MHz|Typical 9|| |Noise Figure|NF|IC=0.2mA,VCE=5V<br>RS=2kΩ,f=1kHz<br>B=200Hz|<10|dB| |SmallSignalCurrentGain|hfe|IC=2mA,VCE=5V-**BC557B**|Typical 330|-| |InputImpedance|hie|IC=2mA,VCE=5V-**BC557B**|3.2-8.5|KΩ| |VoltageFeedbackRatio|hre|IC=2mA,VCE=5V-**BC557B**|Typical 2|×10-4| |OutputAdmittance|hoe|IC=2mA,VCE=5V-**BC557B**|<60|umhos| Newark.com/multicomp-pro Farnell.com/multicomp-pro Element14.com/multicomp-pro 17/09/19 V1.0 Page <2> ## **General Purpose Transistor** |**Dimensions**|**Min.**|**Max.**| |---|---|---| |A|4.32|5.33| |B|4.45|5.2| |C|3.18|4.19| |D|0.41|0.55| |E|0.35|0.5| |F|5°|| |G|1.14|1.4| |H||1.53| |K|12.7|-| Dimensions�:�Millimetres **Pin Configuration:** 1. Emitter 2.�Base 3.�Collector **Part Number Table Description Part Number** Transistor,�PNP,�TO-92 BC557B ~~+~~ **Important Notice :** �This�data�sheet�and�its�contents�(the�“Information”)�belong�to�the�members�of�the�AVNET�group�of�companies�(the�“Group”)�or�are�licensed�to�it.�No�licence�is�granted�for� the�use�of�it�other�than�for�information�purposes�in�connection�with�the�products�to�which�it�relates.�No�licence�of�any�intellectual�property�rights�is�granted.�The�Information�is�subject�to�change� without�notice�and�replaces�all�data�sheets�previously�supplied.�The�Information�supplied�is�believed�to�be�accurate�but�the�Group�assumes�no�responsibility�for�its�accuracy�or�completeness,� any�error�in�or�omission�from�it�or�for�any�use�made�of�it.�Users�of�this�data�sheet�should�check�for�themselves�the�Information�and�the�suitability�of�the�products�for�their�purpose�and�not�make� any�assumptions�based�on�information�included�or�omitted.�Liability�for�loss�or�damage�resulting�from�any�reliance�on�the�Information�or�use�of�it�(including�liability�resulting�from�negligence�or� where�the�Group�was�aware�of�the�possibility�of�such�loss�or�damage�arising)�is�excluded.�This�will�not�operate�to�limit�or�restrict�the�Group’s�liability�for�death�or�personal�injury�resulting�from�its� negligence.�Multicomp�Pro�is�the�registered�trademark�of�Premier�Farnell�Limited�2019. Newark.com/multicomp-pro Farnell.com/multicomp-pro Element14.com/multicomp-pro 17/09/19 V1.0 Page <3>
Updated at April 13, 2026
Multicomp Pro is a trusted manufacturer of high-quality electronic components, built upon the rich heritage of established industry names such as SPC Technology, Tenma, Duratool, and Pro Power. Developed to provide engineers and procurement professionals with exceptional value, the brand offers an extensive portfolio of rigorously lab-tested products. By combining strict quality assurance with cost-effective manufacturing, Multicomp Pro delivers premium reliability while providing significant savings compared to leading industry alternatives. The brand's comprehensive lineup is anchored by a vast selection of passive components and essential circuit protection devices. Engineers consistently rely on Multicomp Pro for aluminum electrolytic capacitors, film capacitors, and power inductors designed for demanding applications. The protection portfolio is equally robust, featuring hundreds of standard fuses, resettable fuses, and transient voltage suppression (TVS) diodes to safeguard critical circuitry. Furthermore, the company is a major provider of precision timing solutions, including a wide array of reliable crystals and standard oscillators. Beyond passives and board-level protection, Multicomp Pro offers extensive solutions in power management, discrete semiconductors, and connectivity. This includes highly efficient AC/DC converters, bridge rectifiers, bipolar transistors, and a versatile selection of wire-to-board terminal blocks. Backed by comprehensive factory audits, continuous laboratory testing, and a strong commitment to ethical sourcing, Multicomp Pro ensures that every component consistently meets stringent international safety and performance standards.
About Novapart
Novapart is a B2B electronic component broker specialising in stock shortages and cost reduction. We source hard-to-find parts and identify compliant alternatives across a catalogue of 410,000+ components from 500+ manufacturers.
Learn more →Stock Shortage Specialist
When a component is unavailable, discontinued or has an unacceptable lead time, we tap into our network of vetted European and Asian distributors to source what you need — without compromising on quality or traceability.
Request a quote →Compliant Alternatives
We identify pin-to-pin, electrically equivalent substitutes that meet the same certifications (RoHS, AEC-Q100, REACH) as your original specification — validated against datasheets, not just part numbers. Often at a lower cost.
BOM Analysis service →