Model No: BC857BLT1G
onsemi BC857BLT1G
Manufacturer: onsemi
SEMICON NO.: BC857BLT1G
Package: SOT-23-3 (TO-236-3, SC-59)
Stock: In stock
Description: Single BJT Transistor 45V 100mA 100MHz 300mW
SEMICON NO.: BC857BLT1G
Package: SOT-23-3 (TO-236-3, SC-59)
Stock: In stock
Description: Single BJT Transistor 45V 100mA 100MHz 300mW
Quantity :
| Mfr | onsemi |
| Device Type | PNP Silicon General-Purpose BJT Transistor |
| Collector-Emitter Voltage (Max) | −45 V (Max) |
| Collector-Base Voltage | −50 V (Max) |
| Emitter-Base Voltage | −5 V (Max) |
| Continuous Collector Current | −100 mA (Max) |
| Peak Collector Current | −200 mA (Max) |
| Power Dissipation | 300 mW (Max) |
| DC Current Gain | 220 (Min) / 475 (Max) |
| Collector-Emitter Saturation Voltage | −650 mV (Max) |
| Base-Emitter Saturation Voltage | −700 mV (Max) |
| Base-Emitter On Voltage | −600 mV (Max) |
| Collector Cut-off Current | 15 nA (Max) |
| Transition Frequency | 100 MHz (Min) |
| Operating Temperature | −55°C to +150°C |
| Package | SOT-23-3 (TO-236-3, SC-59) |
| Mounting Type | Surface Mount |
| Compliance | RoHS Compliant |
The BC857BLT1G is a widely used PNP small-signal bipolar junction transistor manufactured by ON Semiconductor, packaged in compact SOT-23 surface-mount form for tape and reel delivery. This general-purpose PNP transistor features continuous collector current up to 100mA, collector-emitter voltage of 45V, low noise and high current gain, making it ideal for low-power signal amplification and switching circuits. It supports stable operation across standard commercial temperature ranges, and this SOT-23 transistor is favored by designers for its consistent hFE grouping and excellent repeatability in mass production for consumer and industrial low-voltage boards.
Common application scenarios for BC857BLT1G cover multiple electronic designs:
● Audio preamplifier stages for portable speakers and headsets
● Low-speed signal switching and level shifting in MCU peripheral circuits
● Sensor signal amplification for low-power detection modules
●Bias and current source circuits for analog front ends
● General-purpose amplification on consumer electronics and IoT control boards
FAQ
Q: Does BC857BLT1G require heat sinks under normal use?
A: No, its low power dissipation rarely needs extra heat sinking for typical small-signal circuits.
Q: Is this part suitable for high-current load switching?
A: No, it is designed for small signals instead of heavy load driving.
Alternative BJT Transistor models
1. BC856BLT1G is a PNP small-signal SOT-23 transistor with lower minimum current gain for general amplification and switching.
2. BC858BLT1G is a low-noise PNP transistor with wider hFE range, suitable for high-sensitivity audio preamp circuits.
3. MMBT857 is a PNP small-signal transistor in SOT-23 package with similar ratings as a drop-in compatible option for signal circuits.
Common application scenarios for BC857BLT1G cover multiple electronic designs:
● Audio preamplifier stages for portable speakers and headsets
● Low-speed signal switching and level shifting in MCU peripheral circuits
● Sensor signal amplification for low-power detection modules
●Bias and current source circuits for analog front ends
● General-purpose amplification on consumer electronics and IoT control boards
FAQ
Q: Does BC857BLT1G require heat sinks under normal use?
A: No, its low power dissipation rarely needs extra heat sinking for typical small-signal circuits.
Q: Is this part suitable for high-current load switching?
A: No, it is designed for small signals instead of heavy load driving.
Alternative BJT Transistor models
1. BC856BLT1G is a PNP small-signal SOT-23 transistor with lower minimum current gain for general amplification and switching.
2. BC858BLT1G is a low-noise PNP transistor with wider hFE range, suitable for high-sensitivity audio preamp circuits.
3. MMBT857 is a PNP small-signal transistor in SOT-23 package with similar ratings as a drop-in compatible option for signal circuits.
