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Diodes Incorporated BC857BQ-7-F
- Part No.:
- BC857BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC857BQ-7-F.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BC857BQ-7-F from Diodes Incorporated is a PNP small-signal transistor in SOT23 package, rated for VCEO = −45 V, IC = −100 mA, and hFE = 220–475 at IC = −2 mA, used in automotive-grade switching and audio-frequency amplification circuits.
For engineers reviewing the BC857BQ-7-F datasheet, BC857BQ-7-F pinout, BC857BQ-7-F application, or BC857BQ-7-F equivalent, key selection criteria include guaranteed AEC-Q101 qualification, low VCE(sat) (−250 mV typ. at IC = −10 mA/IB = −0.5 mA), high fT (100–200 MHz), and SOT23 lead-free "Green" compliance per RoHS 3 and J-STD-020 Level 1.
Technical Context
This PNP bipolar junction transistor operates with emitter-grounded common-emitter configuration, supporting linear amplification up to 200 MHz and fast switching with ton/toff in the nanosecond range under pulsed conditions (duty cycle ≤ 2%). Its thermal resistance RθJA is 357 °C/W on 15 mm × 15 mm 1 oz copper PCB.
The device features robust ESD protection (HBM 4 kV, MM 400 V), guaranteed breakdown ratings (VCBO = −50 V, VEBO = −5 V), and stable hFE across −50°C to +150°C operating range-enabling use in engine control modules and infotainment power management where thermal and voltage transients occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage before avalanche conduction in switching applications. |
| IC (cont.) | −100 mA: Continuous collector current limit defining maximum load drive capability in bias networks. |
| hFE | 220–475 @ IC = −2 mA: High DC current gain enabling low-base-drive designs in discrete amplifier stages. |
| fT | 100–200 MHz: Gain-bandwidth product confirming suitability for AF amplification and RF pre-driver roles. |
| VCE(sat) | −250 mV typ. @ IC = −10 mA/IB = −0.5 mA: Low saturation voltage minimizing power loss in active-low switch configurations. |
| PD | 350 mW @ 15 mm × 15 mm 1 oz Cu: Power dissipation rating dictating heatsinking requirements on standard PCB layouts. |
Pinout & Package
Package: SOT23 - surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated, 0.008 g weight, and J-STD-020 Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal | Connected to higher potential in PNP operation; defines reference for base biasing and current sourcing path. |
| 2 (Base) | Control input | Receives negative-going signal to turn on; requires current-limited drive due to β-dependent input impedance (~4.5 kΩ). |
| 3 (Collector) | Current sink terminal | Connected to load and supply return; carries full switched current with minimal VCE(sat) drop. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics with PPAP support. |
| Lead-free & Halogen-free | RoHS 3 compliant (<900 ppm Br/Cl, <1000 ppm Sb); meets IATF 16949 manufacturing standards. |
| Low VCE(sat) | −250 mV typical enables >95% efficiency in 5 V logic-level PNP switches driving LEDs or relays. |
| High fT | 200 MHz max supports stable gain in audio preamplifier stages up to 20 kHz with margin. |
| ESD robustness | HBM 4 kV rating reduces risk of field failure during handling and board assembly in industrial environments. |
Applications
| Automotive Door Module | Industrial Sensor Interface |
|---|---|
Use Scenario: Driving window lift motor enable lines and mirror fold/unfold solenoids in 12 V vehicle architectures. IC Role / Device Role / Timing Role: PNP high-side switch controlling ground-return loads with fast turn-off via base pull-up. Use Value: −45 V VCEO withstands load-dump transients; AEC-Q101 qualification ensures reliability over 15-year vehicle life. |
Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor bridges) into ADC front-ends. IC Role / Device Role / Timing Role: Emitter-follower buffer providing low-output-impedance drive without inversion. Use Value: hFE ≥ 220 ensures stable bias under temperature variation; −5 V VEBO prevents reverse-bias damage during sensor fault conditions. |
| Consumer Audio Amplifier | Power Supply Sequencing |
Use Scenario: Complementary pair with BC847BQ in Class-A headphone driver stage for portable media players. IC Role / Device Role / Timing Role: Active-load PNP transistor delivering symmetrical positive half-cycle amplification. Use Value: fT ≥ 100 MHz preserves bandwidth beyond 20 kHz; low NF (2–10 dB) minimizes audible noise floor. |
Use Scenario: Enabling 3.3 V rail after 5 V stabilization in multi-rail embedded systems using open-collector logic. IC Role / Device Role / Timing Role: Inverter-based enable gate with precise VBE(on) (−600 to −750 mV) for predictable threshold timing. Use Value: Tight VBE(sat) (−700 to −1100 mV) ensures consistent turn-on delay across temperature and process corners. |
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,115 (Nexperia) | SOT323 package (smaller footprint), same hFE range but lower VCEO (−45 V), no AEC-Q101 claim. | Limited to non-automotive consumer boards; unsuitable for PPAP-managed production. | Select only when board space is constrained and automotive qualification is not required. |
| MMBT857LT1G (ON Semiconductor) | SOT23 package, identical VCEO/IC, but hFE min = 120 (vs. 220), and no specified HBM ESD rating. | Acceptable for cost-sensitive industrial controls but lacks documented ESD robustness for high-handling-volume assembly. | Prefer when budget limits dominate and ESD immunity is verified externally via board-level protection. |
Compared with BC857BQ-7-F, BC857BW,115 trades automotive qualification for smaller size, while MMBT857LT1G sacrifices guaranteed gain and ESD margin for legacy supply chain compatibility-making BC857BQ-7-F optimal for new AEC-Q101-compliant designs requiring validated performance.
Availability
BC857BQ-7-F is available at Aetrix Electronics and suitable for automotive door modules, industrial sensor interfaces, and consumer audio amplifiers requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for BC857BQ-7-F 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 BC856AQ–BC857BQ series targets automotive and industrial signal conditioning, delivering AEC-Q101-qualified PNP transistors optimized for switching speed, gain consistency, and thermal resilience in harsh environments.
FAQ
Is BC857BQ-7-F pin-compatible with BC847BQ?
No. BC857BQ-7-F is a PNP transistor with emitter-base-collector pinout (1-E, 2-B, 3-C) in SOT23, while BC847BQ is NPN with collector-base-emitter (1-C, 2-B, 3-E). Swapping them without circuit redesign causes polarity inversion and functional failure.
What is the maximum allowable continuous power dissipation at 85°C ambient?
At TA = 85°C, derated power dissipation is 175 mW, calculated from the 350 mW rating at 25°C and 357 °C/W RθJA: PD(85°C) = 350 mW × (1 − (85 − 25)/357) = 175 mW. Exceeding this risks thermal runaway.
Does BC857BQ-7-F support pulsed operation above 100 mA?
Yes. Peak collector current ICM is −200 mA under pulsed conditions (pulse width ≤ 300 µs, duty cycle ≤ 2%), enabling short-duration surge handling in relay drivers and LED strobes without exceeding SOA limits.
Can BC857BQ-7-F be used in place of BC857CQ?
No. BC857CQ has hFE = 420–800, significantly higher than BC857BQ's 220–475. Substituting without recalculating base drive may cause insufficient saturation or excessive base current consumption in critical switching nodes.
BC857BQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 220 @ 2mA, 5V
- Power - Max:
- 310 mW
- Frequency - Transition:
- 200MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BC857BQ-7-F FAQ
1.How can I place an order for BC857BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BQ-7-F 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 BC857BQ-7-F reliable?
The price and inventory of BC857BQ-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BQ-7-F is usually 5 days.
3.What payment methods are accepted for BC857BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BQ-7-F?
BC857BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BQ-7-F 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 BC857BQ-7-F?
For technical support, including BC857BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BQ-7-F requirements.
6.How does Aetrix verify that BC857BQ-7-F is sourced from the original manufacturer or authorized distributors?
All BC857BQ-7-F 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 BC857BQ-7-F meets industry standards.
7.What is the process for return or replacement of BC857BQ-7-F?
All BC857BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC857BQ-7-F, 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 BC857BQ-7-F part is unused and in its original packaging.
Return procedure for BC857BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857BQ-7-F 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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