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Infineon Technologies BC857CB5000
- Part No.:
- BC857CB5000
- Manufacturer:
- Infineon Technologies
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC857CB5000.pdf
- Description:
- TRANS PNP 45V 0.1A PG-SOT23-3-1
- Quantity:
- Payment:
- Shipping:
Inventory:540,000
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Product details
Overview
BC857CB5000 from Nexperia is a PNP silicon small-signal transistor optimized for audio-frequency input stages and driver circuits. It delivers high DC current gain (hFE = 420–800 at IC = 2 mA), low VCE(sat) (max 300 mV at IC = 10 mA/IB = 0.5 mA), and low noise (F = 1–4 dB at 1 kHz) - enabling clean amplification in battery-powered audio preamps and logic-level interface drivers.
For engineers reviewing the BC857CB5000 datasheet, BC857CB5000 pinout, BC857CB5000 application, or BC857CB5000 equivalent, key selection criteria include its SOT23 package compatibility, AEC-Q101 qualification status (not applicable to BC857C variant), hFE group C performance envelope, thermal resistance (RthJS ≤ 240 K/W), and complementary NPN pairing with BC847C.
Technical Context
This PNP transistor operates with VCEO = 45 V and VCBO = 50 V, supporting robust voltage headroom in low-voltage bias networks. Its fT = 250 MHz (typ.) and h21e = 480–600 (at 2 mA) confirm suitability for wideband AF amplification and fast-switching digital interface roles.
Thermal design is constrained by Ptot = 330 mW at TS ≤ 71 °C and RthJS ≤ 240 K/W, requiring careful PCB copper area allocation. The device exhibits low Ccb = 1.5 pF and Ceb = 8 pF, minimizing Miller effect in high-gain configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - supports rail-to-rail operation in 3.3 V/5 V systems with margin against transients |
| hFE (IC = 2 mA) | 420–800 - enables high-impedance base drive with minimal loading on preceding stage |
| VCE(sat) | 300 mV max at IC/IB = 10 mA/0.5 mA - reduces power loss and heat generation in saturated switching |
| fT | 250 MHz typ. - ensures stable gain up to 20 kHz with >10× bandwidth margin for audio fidelity |
| F (noise figure) | 1–4 dB at 1 kHz - preserves signal-to-noise ratio in microphone preamplifier front-ends |
| Ccb | 1.5 pF - limits feedback capacitance in common-emitter amplifiers to prevent instability |
Pinout & Package
BC857CB5000 is housed in a standard SOT23 plastic surface-mount package (3.15 × 1.9 × 1.15 mm), with gull-wing leads and moisture sensitivity level (MSL) 1. Pin 1 is the emitter (E), Pin 2 is the base (B), and Pin 3 is the collector (C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to higher-potential rail in PNP common-emitter amplifier; defines reference for base bias network |
| 2 (Base) | Control input | Receives current-limited drive; requires series resistor to limit IB and ensure hFE-dependent saturation |
| 3 (Collector) | Output current source | Drives load to ground; polarity inversion enables active-low logic interfacing and pull-down switching |
Key Features
| Feature | Design Value |
|---|---|
| High hFE group C | Guaranteed 420–800 at IC = 2 mA, reducing base drive requirements and improving stage gain stability |
| Low VCE(sat) | ≤300 mV under typical switching conditions, lowering conduction loss in discrete load switches |
| Low-noise AF performance | 1–4 dB noise figure at 1 kHz with 2 kΩ source impedance, suitable for sensitive analog front-ends |
| RoHS-compliant SOT23 | Pb-free termination and halogen-free molding compound meet industrial and automotive environmental mandates |
Applications
| Audio Preamp Stage | Logic Level Translator |
|---|---|
|
Use Scenario: Amplifying electret microphone output in portable voice recorders before ADC sampling. IC Role / Device Role / Timing Role: PNP common-emitter amplifier with emitter degeneration for linearity and gain control. Use Value: Low 1–4 dB noise figure preserves SNR; high hFE minimizes base current draw from high-impedance mic bias network. |
Use Scenario: Converting 3.3 V CMOS logic outputs to drive 5 V TTL-compatible inputs in mixed-voltage microcontroller systems. IC Role / Device Role / Timing Role: Active-low level shifter using saturated PNP switch with grounded emitter. Use Value: VCE(sat) ≤ 300 mV ensures <0.3 V drop across collector–emitter, guaranteeing valid LOW level at 5 V receiver. |
| LED Driver Circuit | Current Mirror Reference |
|
Use Scenario: Sourcing current to drive indicator LEDs from 3.3 V supply in industrial HMI panels. IC Role / Device Role / Timing Role: Switch-mode current source with base resistor biasing and collector-connected LED anode. Use Value: 100 mA continuous IC rating supports multiple parallel LEDs; low VCE(sat) maximizes forward voltage margin. |
Use Scenario: Building matched current mirror pair with BC847C for precision biasing in op-amp input stages. IC Role / Device Role / Timing Role: Reference leg of Wilson current mirror, leveraging hFE matching within group C binning. Use Value: Tight hFE range (420–800) and complementary NPN/PPN pairing enable <2% mirror ratio error at 1 mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857BW | SOT323 package (smaller footprint), same hFE group C, but lower Ptot = 250 mW and RthJS = 105 K/W | Better suited for space-constrained layouts where thermal dissipation is managed via board layout | Select when PCB real estate is critical and peak power remains below 200 mW |
| MMBT3906 | Higher VCEO = 40 V (vs. 45 V), wider hFE spread (100–300), no AEC-Q101 option, same SOT23 | More widely available but less consistent gain matching; used in cost-sensitive consumer electronics | Choose for non-automotive designs where tighter hFE tolerance is not required |
Compared with BC857BW and MMBT3906, BC857CB5000 offers superior hFE consistency and higher voltage rating in the industry-standard SOT23 package, making it optimal for precision AF amplification and automotive-qualified designs where gain stability and margin matter.
Availability
BC857CB5000 is available at Aetrix Electronics and suitable for audio preamplifiers, logic level translators, and LED driver circuits requiring stable component supply, consistent hFE binning, and RoHS-compliant packaging.
Supply support for BC857CB5000 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
BC857CB5000 belongs to Nexperia's BC847–BC860 family of general-purpose bipolar transistors, engineered for high-fidelity audio-frequency amplification, low-noise sensing, and robust digital interface functions in compact SMT designs.
FAQ
Is BC857CB5000 AEC-Q101 qualified?
No. BC857CB5000 is not AEC-Q101 qualified. Only specific variants like BC857BL3 are explicitly excluded from qualification per the datasheet; BC857C variants (including BC857CB5000) carry no AEC-Q101 certification. For automotive applications, consider BC857BQ or BC857CQ variants which are AEC-Q101 qualified.
What is the maximum safe operating temperature for BC857CB5000?
The junction temperature (Tj) must not exceed 150 °C. With RthJS ≤ 240 K/W and Ptot = 330 mW at TS ≤ 71 °C, the device requires ≥100 mm² of 1-oz copper pour beneath the SOT23 pad to maintain safe thermal margins at full power.
Can BC857CB5000 replace BC857B in existing designs?
Yes, with functional improvement: BC857CB5000 has higher guaranteed hFE (420–800 vs. 220–475 for BC857B), lower VCE(sat), and identical pinout/package. No circuit changes are needed, but verify bias point stability due to increased gain in linear applications.
What is the marking code for BC857CB5000 on the SOT23 package?
The top-side marking is "3G", indicating the BC857C type with hFE group C. This matches the datasheet's pin configuration table where BC857C corresponds to marking "3G" and pin 1 = emitter, pin 2 = base, pin 3 = collector.
BC857CB5000 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 650mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 330 mW
- Frequency - Transition:
- 250MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-SOT23-3-1
BC857CB5000 FAQ
1.How can I place an order for BC857CB5000 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CB5000 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BC857CB5000 reliable?
The price and inventory of BC857CB5000 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CB5000 is usually 5 days.
3.What payment methods are accepted for BC857CB5000?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CB5000 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CB5000?
BC857CB5000 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CB5000 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BC857CB5000?
For technical support, including BC857CB5000 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CB5000 requirements.
6.How does Aetrix verify that BC857CB5000 is sourced from the original manufacturer or authorized distributors?
All BC857CB5000 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BC857CB5000 meets industry standards.
7.What is the process for return or replacement of BC857CB5000?
All BC857CB5000 units undergo pre-shipment inspection (PSI). If there is an issue with BC857CB5000, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BC857CB5000 part is unused and in its original packaging.
Return procedure for BC857CB5000:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857CB5000 Tags
-
MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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