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I need to find the SMD equivalent of a transistor
jackbauer:
I'm having trouble finding an equivalent for either bc456, bc457 or bc458, which has the very same values or higher voltage and watts but keeping the other values as the same.
Whether I find an "equivalent" SMD, it either has a lower frequency or wattage. Can anyone help me out?
mariush:
BC 456
Polarity: PNP
Maximum Collector Power Dissipation: 0.3 W
Maximum Collector-Base Voltage: 30 V
Maximum Collector-Emitter Voltage: 30 V
Maximum Emitter-Base Voltage: 5 V
Maximum Collector Current: 0.1 A
Maximum Operating Junction Temperature: 125 °C
Transition Frequency: 150 MHz
Forward Current Transfer Ratio (hFE Value): 125
Collector Capacitance: 6 pF
Package: TO92
In bold you have the properties of the replacement, if they're different :
2SA2029 : https://www.digikey.com/en/products/detail/onsemi/2SA2029M3T5G/1475407
NS2029 : https://www.digikey.com/en/products/detail/onsemi/NS2029M3T5G/1792901
Polarity: PNP
Maximum Collector Power Dissipation: 0.30 W 0.265W
Maximum Collector-Base Voltage: 30 V 60v
Maximum Collector-Emitter Voltage: 30 V 50v
Maximum Emitter-Base Voltage: 5 V 6v
Maximum Collector Current: 0.1 A
Maximum Operating Junction Temperature: 125 °C 150c
Transition Frequency: 150 MHz 140 Mhz
Forward Current Transfer Ratio (hFE Value): 125 min. 120, max 560
Collector Capacitance: 6 pF 3.5pF
Package: TO92 SOT-23
They're general purpose pnp transistors, they're unlikely to be used at close to their maximum specifications.
Maybe this would also work, just has lower collector emitter voltage.
MMS8550 : https://www.digikey.com/en/products/detail/onsemi/2SA2029M3T5G/1475407
Polarity: PNP
Maximum Collector Power Dissipation: 0.30 W 0.30W
Maximum Collector-Base Voltage: 30 V 40v
Maximum Collector-Emitter Voltage: 30 V 25v
Maximum Emitter-Base Voltage: 5 V 5v
Maximum Collector Current: 0.1 A 0.5A
Maximum Operating Junction Temperature: 125 °C 150c
Transition Frequency: 150 MHz
Forward Current Transfer Ratio (hFE Value): 125 min. 120, max 350
Collector Capacitance: 6 pF ?
Package: TO92 SOT-23
higher voltage ...
BC806 : https://www.digikey.com/en/products/detail/nexperia-usa-inc/BC806-16VL/10496455
Polarity: PNP
Maximum Collector Power Dissipation: 0.30 W 0.25W - 0.345W if big enough pad
Maximum Collector-Base Voltage: 30 V 80v
Maximum Collector-Emitter Voltage: 30 V 80v
Maximum Emitter-Base Voltage: 5 V 8v
Maximum Collector Current: 0.1 A 0.5A
Maximum Operating Junction Temperature: 125 °C 150c
Transition Frequency: 150 MHz
Forward Current Transfer Ratio (hFE Value): 125 min. 100, max 250 for -16 version, 160 - 400 for -25 version
Collector Capacitance: 6 pF 5 pF
Package: TO92 SOT-23
jackbauer:
The frequency of those is twice lower, are you sure they're fit for the job? Also, those are all PNP, I need NPN.
TimFox:
The BC456 and BC457 are PNP.
The BC458 is NPN.
mariush:
--- Quote from: jackbauer on April 26, 2023, 04:13:00 pm ---The frequency of those is twice lower, are you sure they're fit for the job? Also, those are all PNP, I need NPN.
--- End quote ---
Well, what frequency are you talking about, that is twice lower?
Also, maybe you meant BC547 which is NPN transistor? For BC457 I couldn't even find a datasheet.
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