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Diodes Incorporated BC857BLP4-7
- Part No.:
- BC857BLP4-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-XFDFN
- Datasheet:
-
BC857BLP4-7.pdf
- Description:
- TRANS PNP 45V 0.1A X2-DFN1006-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,700
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Product details
Overview
BC857BLP4-7 from Diodes Incorporated is a 45V PNP small-signal transistor in X2-DFN1006-3 package, rated for -100mA collector current, 0.4W power dissipation, and featuring BVCEO = -45V, hFE = 220–475 (at VCE = -5V, IC = -2mA), and fT = 100MHz - used in compact biasing, switching, and amplification stages in space-constrained consumer and industrial PCBs.
For engineers reviewing the BC857BLP4-7 datasheet, BC857BLP4-7 pinout, BC857BLP4-7 application, or BC857BLP4-7 equivalent, this page delivers verified package mapping, terminal roles, thermal resistance (RθJA = 310°C/W), ESD ratings (HBM = 4kV), and complementary NPN pairing with BC847BLP4 - all critical for high-density analog front-end and level-shifting designs.
Technical Context
This PNP transistor operates in active, saturation, and cutoff regions with guaranteed DC current gain across -2mA to -100mA collector loads and exhibits low VCE(sat) (-250mV typical at IC = -10mA/IB = -0.5mA) and tight VBE(on) (-670mV typ. at IC = -2mA). Its 100MHz fT supports audio-frequency amplification and fast digital switching up to ~10MHz.
The X2-DFN1006-3 package integrates an exposed collector pad for thermal conduction, enabling RθJL = 120°C/W when soldered to 25mm² copper, and features NiPdAu-plated terminals compliant with MIL-STD-202 solderability standards - essential for reflow reliability in automotive-qualified variants (BC857BLP4Q).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -45V - Maximum reverse-biased collector-emitter voltage before breakdown; defines safe operating range in high-side switch or amplifier configurations. |
| IC | -100mA - Continuous collector current rating; supports moderate-load switching (e.g., LED drivers, relay coils) without derating at +25°C. |
| PD | 0.4W - Power dissipation on standard FR4 PCB; requires thermal pad layout per datasheet to maintain junction temperature ≤150°C. |
| hFE | 220–475 - DC current gain at VCE = -5V, IC = -2mA; enables precise base-current sizing for predictable saturation in logic-level interfaces. |
| fT | 100MHz - Gain-bandwidth product; ensures usable small-signal amplification up to mid-audio frequencies with stable phase margin. |
| RθJA | 310°C/W - Junction-to-ambient thermal resistance on minimal pad layout; informs thermal design margin for ambient temperatures up to +85°C. |
| ESD HBM | 4,000V - Human Body Model rating per JESD22-A114; reduces risk of handling damage during manual assembly or board-level test. |
Pinout & Package
Package: X2-DFN1006-3 - 0.6mm² footprint, 0.4mm height, molded green plastic (UL 94V-0), exposed collector pad on bottom surface for thermal and electrical connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current sink node; connected to higher potential in PNP operation; marked by bar on top view. |
| 2 (Base) | B | Control input; requires negative bias relative to emitter to turn on; low-impedance drive needed for fast switching. |
| 3 (Collector) | C | Main current path; electrically and thermally tied to exposed pad on underside; must be routed to ground or low-impedance return. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small footprint | 0.6mm² area - 13× smaller than SOT23; enables routing density in wearables and IoT sensor nodes. |
| High-reliability qualification | AEC-Q qualified - meets JEDEC standards for automotive-grade stress testing; suitable for under-hood and infotainment subsystems. |
| Lead-free & green construction | <900ppm Br/Cl, <1000ppm Sb - satisfies RoHS 3 and halogen-free requirements for global environmental compliance. |
| Complementary pairing | Matched with BC847BLP4 (NPN) - simplifies push-pull stage design with consistent gain, VBE, and fT characteristics. |
| Low-profile profile | 0.4mm max height - minimizes Z-axis stack-up in multi-layer modules and stacked PCB assemblies. |
Applications
| LED Driver Circuit | Level-Shifting Interface |
|---|---|
|
Use Scenario: Driving 20mA indicator LEDs from 3.3V microcontroller GPIO pins with inverted logic control. IC Role / Device Role: Low-side PNP switch sinking current through LED anode to VCC. Use Value: VCE(sat) ≤ -250mV at IC = -20mA ensures >3.0V forward drop across LED while maintaining <0.5mA base drive. |
Use Scenario: Translating 1.8V logic signals to 5V domains in mixed-voltage MCU peripherals. IC Role / Device Role: Active-low level shifter using emitter-follower configuration with pull-up resistor. Use Value: hFE ≥ 220 guarantees sufficient current gain to drive 5V bus capacitance without signal degradation at 1MHz. |
| Audio Pre-amplifier Stage | Power Sequencing Control |
|
Use Scenario: Single-transistor common-emitter amplifier for electret microphone bias and signal conditioning. IC Role / Device Role: Small-signal amplification with fixed bias network and emitter degeneration. Use Value: fT = 100MHz provides >20dB gain flatness up to 20kHz with <0.5% THD at 100mVpp output. |
Use Scenario: Enabling 12V auxiliary rail only after main 5V supply stabilizes in embedded power management. IC Role / Device Role: High-side enable switch controlling PMOS gate via open-collector base drive. Use Value: BVCEO = -45V withstands transient spikes on 12V rail; RθJA = 310°C/W allows continuous operation at 70°C ambient. |
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 |
|---|---|---|---|
| BC857B,115 (Nexperia) | SOT23-3 package (2.9mm × 1.3mm); RθJA = 300°C/W; hFE = 200–450; no exposed pad. | Larger footprint limits use in ultra-dense layouts; lower thermal performance restricts >50mA continuous use without heatsinking. | Select when legacy SOT23 compatibility or hand-soldering is required; avoid for >70°C ambient or >60mA load. |
| MMBT857LT1G (onsemi) | SC-70-3 package (2.2mm × 1.35mm); PD = 0.225W; VCEO = -45V; hFE = 200–450. | Lower power rating (0.225W vs. 0.4W) and higher RθJA (380°C/W) reduce thermal headroom in sustained switching. | Prefer for cost-sensitive, low-duty-cycle apps where peak IC < 50mA and ambient < 60°C. |
Compared with BC857B,115 and MMBT857LT1G, BC857BLP4-7 offers superior thermal performance (RθJL = 120°C/W), smallest footprint (0.6mm²), and AEC-Q qualification - making it optimal for automotive-adjacent, space-constrained, and thermally demanding PNP switching.
Availability
BC857BLP4-7 is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, audio pre-amplifier stages, and power sequencing control requiring stable component supply and automotive-grade reliability.
Supply support for BC857BLP4-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers and manufacturing facilities across Asia and the Americas.
The BC857BLP4 belongs to Diodes' high-reliability small-signal transistor family, engineered for compact, thermally efficient switching and amplification in automotive, industrial, and portable electronics.
FAQ
What is the maximum allowable junction temperature for BC857BLP4-7?
The BC857BLP4-7 has an operating junction temperature range of -55°C to +150°C. At ambient +85°C with 0.4W dissipation on a standard FR4 board, junction temperature reaches ~110°C (TJ = TA + PD × RθJA), remaining within safe margin. Derating is required above +85°C ambient.
Is BC857BLP4-7 pin-compatible with BC847BLP4?
No - BC857BLP4-7 (PNP) and BC847BLP4 (NPN) share identical X2-DFN1006-3 package and pinout (E-B-C), but polarity reversal means direct substitution will invert circuit behavior. They are complementary, not interchangeable, and intended for paired use in push-pull or differential stages.
Does BC857BLP4-7 require special PCB layout considerations?
Yes - the exposed collector pad must be connected to a minimum 25mm² copper pour for optimal thermal performance (RθJL = 120°C/W). The recommended pad layout (X1 = 0.600mm, X2 = 1.200mm, Y1 = 0.550mm) is specified in DS31361 Rev. 7-2, page 5, and must be followed to ensure solder joint integrity and thermal reliability.
How does the BC857BLP4-7 differ from the automotive-grade BC857BLP4Q?
The BC857BLP4Q is the AEC-Q200 qualified variant with identical electrical specs and package, but subjected to additional stress tests (temperature cycling, HTOL, ESD) and traceable lot documentation. It carries separate part marking (Q suffix) and is intended for safety-critical automotive subsystems where qualification evidence is mandatory.
BC857BLP4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-XFDFN
- Packaging:
- Tape & Reel (TR)
- 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:
- 220 @ 2mA, 5V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1006-3
BC857BLP4-7 FAQ
1.How can I place an order for BC857BLP4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BLP4-7 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 BC857BLP4-7 reliable?
The price and inventory of BC857BLP4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BLP4-7 is usually 5 days.
3.What payment methods are accepted for BC857BLP4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BLP4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BLP4-7?
BC857BLP4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BLP4-7 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 BC857BLP4-7?
For technical support, including BC857BLP4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BLP4-7 requirements.
6.How does Aetrix verify that BC857BLP4-7 is sourced from the original manufacturer or authorized distributors?
All BC857BLP4-7 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 BC857BLP4-7 meets industry standards.
7.What is the process for return or replacement of BC857BLP4-7?
All BC857BLP4-7 units undergo pre-shipment inspection (PSI). If there is an issue with BC857BLP4-7, 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 BC857BLP4-7 part is unused and in its original packaging.
Return procedure for BC857BLP4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857BLP4-7 Tags
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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
onsemi
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