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Nexperia USA Inc. BC857CM,315
- Part No.:
- BC857CM,315
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-101, SOT-883
- Datasheet:
-
BC857CM,315.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-883
- Quantity:
- Payment:
- Shipping:
Inventory:8,500
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Product details
Overview
BC857CM,315 from Nexperia is a PNP general purpose transistor in SOT883 ultra-small leadless package (1.0 × 0.6 × 0.5 mm), rated for −45 V VCEO, −100 mA IC, and DC current gain hFE of 420–800 at −5 V VCE/−2 mA IC. It serves as a low-power switching or amplification element in space-constrained portable electronics such as digital cameras and PCMCIA cards.
For engineers reviewing the BC857CM,315 datasheet, BC857CM,315 pinout, BC857CM,315 application, or BC857CM,315 equivalent, key selection criteria include its high hFE bin, ultra-compact SOT883 footprint, low VBE (−600 to −750 mV), robust thermal resistance (290 K/W on FR4), and compatibility with automated placement in high-density mobile PCBs.
Technical Context
This PNP bipolar junction transistor operates in active or saturation mode for DC signal amplification and low-to-medium frequency switching. Its design emphasizes high current gain consistency across temperature (−55 °C to +150 °C) and low base-emitter voltage drop under bias.
The device uses standard silicon planar epitaxial process technology, features isolated collector pad for improved thermal dissipation (430 mW at Tamb ≤ 25 °C with 1 cm² copper), and exhibits low noise figure (≤10 dB at 1 kHz) and transition frequency fT ≥ 100 MHz - enabling use in RF front-end biasing and audio preamplifier stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage before breakdown; supports rail-to-rail operation in 3.3 V/5 V logic-level circuits. |
| hFE | 420–800 at −5 V VCE/−2 mA IC: High DC gain enables low-base-drive designs, reducing MCU GPIO loading in discrete switch applications. |
| VBE | −600 to −750 mV at −2 mA IC: Predictable forward bias ensures stable turn-on threshold in precision current mirror or level-shifting circuits. |
| Ptot | 430 mW on FR4 with 1 cm² collector pad: Enables higher continuous current handling than typical SOT23 equivalents without thermal derating. |
| fT | ≥100 MHz: Supports small-signal amplification up to VHF band, suitable for IF stages and oscillator bias networks. |
| Cc | ≤2.5 pF at −10 V VCB: Low collector capacitance minimizes Miller effect, preserving bandwidth in high-gain amplifier configurations. |
Pinout & Package
SOT883 is a leadless ultra-small plastic package (1.0 × 0.6 × 0.5 mm) with three solder lands on bottom surface; board space footprint is 1.3 × 0.9 mm. Thermal performance relies on direct copper pad contact for collector terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input node; requires current-limited drive (max IB = −100 mA peak) to avoid saturation delay or thermal stress. |
| 2 | Emitter | Common reference terminal; internally connected to substrate ground plane in SOT883 layout - must be routed with low-inductance path. |
| 3 | Collector | Main power output node; designed for direct thermal coupling to PCB copper area (1 cm² minimum) to sustain 430 mW dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact footprint | 1.0 × 0.6 × 0.5 mm body with 1.3 × 0.9 mm board space - enables >3× density vs. SOT23 in camera module flex PCBs. |
| High hFE bin (D3) | Guaranteed 420–800 gain range reduces variation in current mirror matching and improves linearity in analog sensor interfaces. |
| Low VBE dispersion | −600 to −750 mV spread ensures consistent turn-on behavior across production lots, simplifying bias network design. |
| Thermal-enhanced dissipation | 290 K/W Rth(j-a) with optimized FR4 mounting - allows sustained −100 mA operation without external heatsinking. |
Applications
| Digital Camera Autofocus Driver | PCMCIA Card Level Shifter |
|---|---|
|
Use Scenario: Driving voice coil motor (VCM) in compact autofocus modules where board height is limited to <0.8 mm. IC Role / Device Role / Timing Role: PNP switch controlling bidirectional current through VCM coil; operates in saturation with fast turn-off via base pull-down. Use Value: Ultra-low profile (0.5 mm height) and high hFE enable precise microsecond-scale current control without added gate drivers. |
Use Scenario: Translating 3.3 V logic signals to 5 V levels between PCMCIA host controller and legacy peripherals. IC Role / Device Role / Timing Role: Discrete level shifter using emitter-follower configuration; provides rail-compatible output swing with minimal propagation delay. Use Value: Low VBE and tight gain tolerance ensure accurate 5 V output referencing, critical for reliable card enumeration timing. |
| Wearable Sensor Signal Conditioning | Industrial PLC Input Isolation Stage |
|
Use Scenario: Amplifying weak thermistor or photodiode signals in hearable devices with strict EMI and size constraints. IC Role / Device Role / Timing Role: Common-emitter preamplifier stage with fixed bias network; operates in linear region for analog signal integrity. Use Value: 100 MHz fT and ≤10 dB noise figure preserve SNR in sub-10 μV signal paths while fitting within 2 mm² total area. |
Use Scenario: Optocoupler input stage in DIN-rail mounted PLC modules requiring long-term reliability at 85 °C ambient. IC Role / Device Role / Timing Role: Current-limiting driver for IR LED anode; configured as constant-current source with feedback resistor. Use Value: Guaranteed hFE min of 420 ensures stable LED current over temperature, eliminating need for recalibration during field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP general purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857B,315 | hFE = 220–475 (lower gain bin); otherwise identical electrical specs and SOT883 package. | Less suitable for low-base-drive or high-precision current mirror applications due to wider hFE tolerance. | Select when cost sensitivity outweighs gain stability requirements; compatible with same PCB footprint and reflow profile. |
| MMBT3906LT1G | SOT23-3 package (larger footprint); hFE = 100–300; Rth(j-a) = 375 K/W - lower thermal efficiency. | Not viable for ultra-dense layouts; requires larger board area and may need derating above 70 °C ambient. | Choose only if existing SOT23 design reuse is mandatory; not recommended for new space-constrained designs. |
Compared with BC857B,315 and MMBT3906LT1G, BC857CM,315 delivers superior gain consistency and thermal performance in minimal volume - making it optimal for next-generation wearables and embedded imaging systems where size and parametric stability are non-negotiable.
Availability
BC857CM,315 is available at Aetrix Electronics and suitable for digital camera modules, PCMCIA interface boards, and wearable sensor nodes requiring stable component supply, consistent hFE binning, and ultra-compact packaging.
Supply support for BC857CM,315 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP's Standard Products division in 2017 and focused on automotive, industrial, computing, and consumer markets.
The BC857M series belongs to Nexperia's general-purpose bipolar transistor product line, engineered specifically for high-density portable electronics demanding miniature packaging, predictable gain, and robust thermal behavior.
FAQ
What is the maximum continuous collector current for BC857CM,315?
The absolute maximum DC collector current (IC) is −100 mA per the datasheet limiting values table. This rating assumes standard mounting on FR4 with 1 cm² copper pad for the collector terminal. At ambient temperatures above 25 °C, derating applies per the thermal resistance curve - e.g., at 85 °C ambient, usable IC drops to approximately −65 mA to maintain Tj ≤ 150 °C.
Is BC857CM,315 pin-compatible with BC847M series NPN transistors?
No - BC857CM,315 is a PNP transistor with pinout Base–Emitter–Collector (1–2–3), while the NPN-complement BC847CM,315 has pinout Emitter–Base–Collector (1–2–3) in the same SOT883 package. Swapping them without circuit revision causes polarity inversion and functional failure. Layout must reflect correct terminal mapping per each device's symbol and pinning diagram.
Does BC857CM,315 require special reflow profile considerations?
Yes - due to its leadless SOT883 construction and small thermal mass, BC857CM,315 demands precise reflow control: peak temperature must not exceed 260 °C, time above 217 °C should be 40–90 seconds, and ramp rates must stay within 1–3 °C/s. Exceeding these risks solder joint voiding or die attach delamination, especially given the absence of leads to absorb thermal stress.
Can BC857CM,315 be used in RF amplifier stages?
Yes - with verified fT ≥ 100 MHz and Cc ≤ 2.5 pF, BC857CM,315 supports small-signal amplification up to ~100 MHz in common-emitter configuration. It has been characterized in RF bias networks and VHF oscillator stages, but is not specified for power RF output; use requires impedance-matching networks and careful layout to minimize parasitic inductance at the base and collector terminals.
BC857CM,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-101, SOT-883
- 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:
- 400mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 150 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-883
BC857CM,315 FAQ
1.How can I place an order for BC857CM,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857CM,315 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 BC857CM,315 reliable?
The price and inventory of BC857CM,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CM,315 is usually 5 days.
3.What payment methods are accepted for BC857CM,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CM,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857CM,315?
BC857CM,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857CM,315 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 BC857CM,315?
For technical support, including BC857CM,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CM,315 requirements.
6.How does Aetrix verify that BC857CM,315 is sourced from the original manufacturer or authorized distributors?
All BC857CM,315 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 BC857CM,315 meets industry standards.
7.What is the process for return or replacement of BC857CM,315?
All BC857CM,315 units undergo pre-shipment inspection (PSI). If there is an issue with BC857CM,315, 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 BC857CM,315 part is unused and in its original packaging.
Return procedure for BC857CM,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857CM,315 Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
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MMBT3904LT1G
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MMBT3906-7-F
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MMBT2222A-7-F
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BC846BLT1G
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BC847B,215
Nexperia USA Inc.
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MMBTA06LT1G
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