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Diodes Incorporated BC856BWQ-7
- Part No.:
- BC856BWQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC856BWQ-7.pdf
- Description:
- TRANS PNP 65V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:8,748
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Product details
Overview
BC856BWQ from Diodes Incorporated is a 65V PNP small-signal bipolar junction transistor (BJT) in SOT323 package, rated for -100mA continuous collector current, -65V VCEO, and AEC-Q101 qualified for automotive use. It delivers hFE of 220–475 at -2mA/-5V, fT ≥100MHz, and VCE(sat) ≤-300mV at -10mA/-0.5mA, supporting switching and audio-frequency amplifier functions in engine control modules and body electronics.
For engineers reviewing the BC856BWQ datasheet, BC856BWQ pinout, BC856BWQ application, or BC856BWQ equivalent, key selection criteria include its AEC-Q101 qualification, SOT323 thermal resistance (RθJA = 625°C/W), low VBE(sat) (-700mV typ), high fT, and complementary pairing with BC846BWQ for push-pull designs.
Technical Context
This PNP BJT operates in active, saturation, and cutoff regions with pulsed VCE(sat) measured at ≤300µs pulse width and ≤2% duty cycle. Its DC current gain exhibits strong temperature dependence-hFE drops from ~290 at +25°C to ~100 at +150°C under -2mA bias.
The device uses a planar epitaxial structure with matte tin-plated leads, optimized for automatic insertion and reflow soldering per MIL-STD-202. Its 0.006g mass and SOT323 footprint support space-constrained automotive PCB layouts while maintaining 200mW power dissipation on minimum FR4 pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -65V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC | -100mA - Continuous collector current rating defining maximum linear/saturation load drive capability |
| hFE | 220–475 - DC current gain range at VCE = -5V, IC = -2mA, directly impacting base drive sizing |
| fT | 100–200MHz - Gain-bandwidth product determining usable frequency limit for small-signal amplification |
| VCE(sat) | -300mV max at IC = -10mA/IB = -0.5mA - Low saturation voltage enabling efficient switching with minimal conduction loss |
| RθJA | 625°C/W - Junction-to-ambient thermal resistance on standard 1oz FR4, defining derating curve above +25°C ambient |
| PD | 200mW - Maximum steady-state power dissipation under specified PCB layout and still-air conditions |
Pinout & Package
Package: SOT323 - Surface-mount plastic case, 0.006g weight, UL 94V-0 rated molding compound, moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current sink terminal; connects to higher potential in PNP operation; requires proper grounding or bias network |
| 2 (Base) | B | Control electrode; negative input relative to emitter to turn on; requires current-limiting resistor in digital switch applications |
| 3 (Collector) | C | Current source terminal; connects to load and supply rail; handles full switched current and associated power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| SOT323 package | Compact 2.2 × 2.1 mm footprint with 0.65 mm lead pitch, compatible with high-density automated assembly |
| Complementary NPN pair | BC846BWQ available for matched push-pull or differential pair configurations with consistent gain and thermal behavior |
| Halogen- and antimony-free | Meets "Green" definition: Br <900ppm, Cl <900ppm (Br+Cl <1500ppm), Sb <1000ppm - supports eco-compliance programs |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; no intentionally added lead, suitable for Pb-free reflow profiles |
Applications
| Engine Control Unit (ECU) Signal Conditioning | Automotive Door Module Switch Drivers |
|---|---|
Use Scenario: Amplifying low-level sensor signals (e.g., knock sensor output) before ADC sampling in engine management systems. IC Role / Device Role / Timing Role: Small-signal PNP amplifier operating in common-emitter configuration with fixed bias network. Use Value: High hFE (290 typ) enables low-base-drive current design, reducing MCU GPIO loading and improving noise immunity at 1–10kHz bandwidth. | Use Scenario: Driving resistive loads such as LED status indicators and relay coils in door control modules. IC Role / Device Role / Timing Role: Digital switch in saturation mode, controlled by microcontroller GPIO with current-limiting base resistor. Use Value: VCE(sat) ≤-300mV ensures <30mW conduction loss at 100mA, minimizing thermal rise in sealed module enclosures. |
| Body Control Module (BCM) Level Shifting | Automotive HVAC Fan Speed Control |
Use Scenario: Translating 3.3V logic signals from CAN transceivers to 5V/12V domains for solenoid actuation drivers. IC Role / Device Role / Timing Role: Level-shifting switch with emitter-follower or common-base topology depending on interface direction. Use Value: -65V VCEO provides margin against load-dump transients up to ±60V, meeting ISO 7637-2 Pulse 5a requirements. | Use Scenario: PWM-controlled fan motor driver stage in climate control units requiring bidirectional speed regulation. IC Role / Device Role / Timing Role: Low-side switch in discrete H-bridge half-bridge configuration with complementary BC846BWQ. Use Value: Matched fT (≥100MHz) and hFE between PNP/NPN pairs ensure balanced switching timing and reduced shoot-through risk at 20kHz PWM. |
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 |
|---|---|---|---|
| BC857BWQ | Higher hFE group (420–800), same VCEO/IC/package | Better suited for low-base-drive analog amplification where gain consistency is critical | Select when higher DC gain stability across temperature is required over wide IC range |
| MMBT3906 | Same VCEO (-40V), lower IC (-200mA), non-AEC-Q101, SOT23 package | Limited to non-automotive industrial or consumer applications due to qualification gap and larger thermal resistance | Choose only for cost-sensitive non-automotive designs where AEC-Q101 and SOT323 size are not mandatory |
Compared with BC856BWQ, BC857BWQ offers higher gain but tighter tolerance constraints, while MMBT3906 sacrifices automotive qualification and thermal performance for broader commercial availability-making BC856BWQ optimal for space-limited, thermally demanding AEC-Q101 applications.
Availability
BC856BWQ is available at Aetrix Electronics and suitable for engine control units, body control modules, and automotive lighting systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BC856BWQ 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, manufacturing, and sales operations across Asia, Europe, and North America.
The BC856BWQ belongs to Diodes' automotive-qualified small-signal transistor product line, engineered specifically for reliable signal switching and amplification in harsh-temperature, high-reliability vehicle subsystems.
FAQ
Is BC856BWQ pin-compatible with BC846BWQ?
No-BC856BWQ (PNP) and BC846BWQ (NPN) share identical SOT323 pinout (E-B-C), but their complementary polarity means they cannot substitute directly without circuit topology changes. Both use the same physical layout and marking orientation, enabling symmetric PCB design for push-pull stages.
What is the maximum allowable junction temperature during operation?
The BC856BWQ has an absolute maximum junction temperature of +150°C, with storage temperature matching this range. Derating begins above +25°C ambient per the power dissipation curve in Figure 1; at +85°C ambient, maximum usable power drops to ~80mW on standard FR4 layout.
Does BC856BWQ require special handling for moisture sensitivity?
No-BC856BWQ is rated Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH without baking prior to reflow. No floor life limitations apply, simplifying SMT line logistics and inventory management.
Can BC856BWQ be used in linear regulator pass transistor applications?
Not recommended-its 200mW power rating and 625°C/W thermal resistance limit safe linear operation to very low dropout (<1V) and sub-50mA loads. Designed for switching and AF amplification, not continuous power dissipation; dedicated pass transistors like ZTX951 offer superior SOA and thermal performance.
BC856BWQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 65 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:
- 200 mW
- Frequency - Transition:
- 200MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC856BWQ-7 FAQ
1.How can I place an order for BC856BWQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC856BWQ-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 BC856BWQ-7 reliable?
The price and inventory of BC856BWQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856BWQ-7 is usually 5 days.
3.What payment methods are accepted for BC856BWQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856BWQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC856BWQ-7?
BC856BWQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC856BWQ-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 BC856BWQ-7?
For technical support, including BC856BWQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856BWQ-7 requirements.
6.How does Aetrix verify that BC856BWQ-7 is sourced from the original manufacturer or authorized distributors?
All BC856BWQ-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 BC856BWQ-7 meets industry standards.
7.What is the process for return or replacement of BC856BWQ-7?
All BC856BWQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with BC856BWQ-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 BC856BWQ-7 part is unused and in its original packaging.
Return procedure for BC856BWQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC856BWQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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