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Nexperia USA Inc. BC857BW/SNX
- Part No.:
- BC857BW/SNX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857BW/SNX.pdf
- Description:
- TRANS PNP 45V 0.1A SC-70
- Quantity:
- Payment:
- Shipping:
Inventory:6,774
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Product details
Overview
BC857BW/SNX from Nexperia is a PNP general-purpose bipolar junction transistor in SOT323 (SC-70) package, rated for −45 V VCEO, −100 mA IC, and offering hFE of 220–475 at VCE = −5 V and IC = −2 mA. It serves as a low-voltage, low-current switching or amplification device in space-constrained consumer and industrial PCBs.
For engineers reviewing the BC857BW/SNX datasheet, BC857BW/SNX pinout, BC857BW/SNX application, or BC857BW/SNX equivalent, key selection criteria include its guaranteed DC current gain range, SOT323 thermal resistance (625 K/W), −45 V collector-emitter breakdown rating, and compatibility with reflow soldering per JEDEC J-STD-020.
Technical Context
This PNP BJT operates in active or saturation mode with base-emitter turn-on voltage of −650 mV typical at IC = −10 mA, and exhibits VCE(sat) ≤ −600 mV at IC = −100 mA / IB = −5 mA. Its fT of 100 MHz supports moderate-frequency signal amplification up to audio bands.
Thermal performance is defined for FR4 PCB mounting (single-sided, 35 µm Cu), with Rth(j-a) = 625 K/W and maximum junction temperature of 150 °C. The device complies with IEC 60134 absolute maximum ratings, including −50 V VCBO and −5 V VEBO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in PNP switch designs |
| IC | −100 mA - Continuous DC collector current rating; sets load-driving capacity in linear or switching operation |
| hFE | 220–475 - Guaranteed DC current gain at VCE = −5 V, IC = −2 mA; enables predictable base drive sizing |
| VCE(sat) | ≤ −600 mV - Max collector-emitter saturation voltage at IC = −100 mA / IB = −5 mA; determines on-state power loss in switches |
| Rth(j-a) | 625 K/W - Junction-to-ambient thermal resistance on standard FR4; informs derating above 25 °C ambient |
| fT | 100 MHz - Transition frequency at VCE = −5 V, IC = −10 mA; indicates usable bandwidth for small-signal amplification |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: 1.3 mm × 1.8 mm footprint, 0.95 mm height, 3-lead single-row configuration optimized for high-density PCB layouts and automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires series resistor to limit IB and ensure saturation or linear bias |
| 2 | Emitter (E) | Common terminal for PNP topology; connects to higher potential rail in switch configurations |
| 3 | Collector (C) | Output current path; sinks current from load to emitter when biased on |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOT323 package | Enables placement in <1.0 mm board height constraints and supports 0.5 mm pitch reflow footprints |
| Guaranteed hFE range (220–475) | Reduces need for binning or feedback compensation in production-grade current mirror or amplifier stages |
| VCE(sat) ≤ −600 mV @ IC/IB = 20 | Minimizes conduction loss in low-side PNP switch applications operating near 3.3 V or 5 V rails |
| JEDEC-compliant SC-70 outline | Ensures mechanical and thermal interoperability with standard pick-and-place nozzles and reflow profiles |
Applications
| LED Driver Circuit | Level-Shifting Interface |
|---|---|
Use Scenario: Driving discrete indicator LEDs from microcontroller GPIO pins with inverted logic. IC Role / Device Role / Timing Role: PNP switch controlling LED anode connection to VCC; activated by low GPIO output. Use Value: Low VCE(sat) ensures >95% LED forward voltage utilization at 20 mA, minimizing wasted power in portable devices. |
Use Scenario: Translating 1.8 V logic outputs to 3.3 V or 5 V domains in mixed-voltage digital systems. IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-emitter configuration. Use Value: Guaranteed hFE and fast fT support clean edge transitions up to 10 MHz without added propagation delay. |
| Signal Amplifier Stage | Power Supply Enable Switch |
Use Scenario: Small-signal preamplification of sensor outputs (e.g., thermistor, photodiode) before ADC input. IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed bias network; provides 20–30 dB voltage gain. Use Value: 100 MHz fT and low noise figure (2–10 dB) preserve signal integrity in sub-100 kHz analog front-ends. |
Use Scenario: Enabling/disabling auxiliary power rails (e.g., 3.3 V LDO output) via MCU control signal. IC Role / Device Role / Timing Role: High-side PNP pass switch placed between input rail and LDO input. Use Value: −45 V VCEO margin allows safe operation with 24 V backup supplies; SOT323 footprint saves board area vs. SO-8 alternatives. |
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,115 (Nexperia) | Same electrical specs and SOT323 package; differs only in tape-and-reel packaging code (no functional impact) | No difference in circuit behavior or layout; identical thermal and electrical performance | Select when standard reel packaging is required for SMT line compatibility |
| MMBT3906LT1G (onsemi) | Higher VCEO (−40 V), lower hFE min (100), same SOT23-3 package but larger footprint (2.9 mm × 1.3 mm) | Requires PCB land pattern revision; suitable where higher voltage margin is needed but gain tolerance is relaxed | Choose for legacy SOT23-compatible designs or where −40 V rating suffices and cost optimization is prioritized |
Compared with BC857BW/SNX, BC857B,115 offers identical performance in a different reel format, while MMBT3906LT1G trades guaranteed high hFE for broader industry availability and slightly larger package-critical for manual prototyping or multi-source procurement strategies.
Availability
BC857BW/SNX is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, signal amplifier stages, and power supply enable switches requiring stable component supply across high-mix, low-volume production runs.
Supply support for BC857BW/SNX 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 leading semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-volume, high-reliability discrete and logic devices for consumer, industrial, and automotive markets.
The BC857BW/SNX belongs to Nexperia's BC856W/BC857W/BC858W family of general-purpose PNP transistors, engineered for cost-sensitive, space-constrained applications demanding consistent gain, low saturation voltage, and robust SMT manufacturability.
FAQ
What is the maximum allowable junction temperature for BC857BW/SNX?
The absolute maximum junction temperature (Tj) is 150 °C, as specified in Table 6 of the Nexperia datasheet. Operation above this threshold risks permanent parametric shift or failure. Derating is required above 25 °C ambient based on Rth(j-a) = 625 K/W and actual PCB copper area.
Does BC857BW/SNX support wave soldering?
Yes-Nexperia provides dedicated wave soldering footprint data (Figure 16) for SOT323, specifying 3.65 mm × 2.1 mm solder lands and preferred transport direction. Thermal mass and lead-free process compatibility are validated per IPC-J-STD-020, though reflow is recommended for optimal reliability.
How does the BC857BW/SNX hFE bin differ from BC857CW?
BC857BW/SNX has hFE = 220–475 at VCE = −5 V, IC = −2 mA, whereas BC857CW offers 420–800 in the same test condition. The 'W' suffix denotes standard gain grade; 'CW' indicates high-gain variant-both share identical VCEO, IC, and package, enabling direct substitution where gain headroom is acceptable.
Is BC857BW/SNX automotive qualified?
No-this part is not AEC-Q101 qualified. The Nexperia datasheet explicitly states "Non-automotive qualified products" in Section 14, and no automotive stress testing or qualification data is provided. It is intended for commercial and industrial applications only.
BC857BW/SNX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 220 @ 2mA, 5V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70
BC857BW/SNX FAQ
1.How can I place an order for BC857BW/SNX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BW/SNX 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 BC857BW/SNX reliable?
The price and inventory of BC857BW/SNX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BW/SNX is usually 5 days.
3.What payment methods are accepted for BC857BW/SNX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BW/SNX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BW/SNX?
BC857BW/SNX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BW/SNX 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 BC857BW/SNX?
For technical support, including BC857BW/SNX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BW/SNX requirements.
6.How does Aetrix verify that BC857BW/SNX is sourced from the original manufacturer or authorized distributors?
All BC857BW/SNX 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 BC857BW/SNX meets industry standards.
7.What is the process for return or replacement of BC857BW/SNX?
All BC857BW/SNX units undergo pre-shipment inspection (PSI). If there is an issue with BC857BW/SNX, 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 BC857BW/SNX part is unused and in its original packaging.
Return procedure for BC857BW/SNX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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