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Diodes Incorporated BC857BW-7-F
- Part No.:
- BC857BW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857BW-7-F.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:8,468
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Product details
Overview
BC857BW-7-F from Diodes Incorporated is a PNP small-signal transistor in SOT323 package, rated for VCEO = −45 V, IC = −100 mA, and hFE = 220–475 (Group B), optimized for switching and audio-frequency amplification in space-constrained PCBs.
For engineers reviewing the BC857BW-7-F datasheet, BC857BW-7-F pinout, BC857BW-7-F application, or BC857BW-7-F equivalent, key selection criteria include guaranteed DC current gain at low collector current, low VCE(sat) under 10 mA drive, thermal performance on FR4, and JEDEC-compliant reliability for industrial signal conditioning.
Technical Context
This PNP bipolar junction transistor operates with emitter-base forward bias and collector-base reverse bias in active or saturation mode. Its design supports linear amplification up to 200 MHz fT and fast switching with <300 µs pulse capability per JEDEC test conditions.
It features a complementary NPN counterpart series (BC846AW–BC848CW), shares identical SOT323 mechanical footprint and thermal resistance (RθJA = 625 °C/W), and meets J-STD-020 moisture sensitivity Level 1 for reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC | −100 mA - Continuous DC collector current rating defining maximum linear/saturation load handling. |
| hFE (Group B) | 220–475 - Guaranteed DC current gain range at VCE = −5 V, IC = −2 mA for predictable biasing. |
| VCE(sat) | −75 to −300 mV - Low saturation voltage at IC = −10 mA / IB = −0.5 mA, minimizing power loss in switch mode. |
| fT | 100–200 MHz - Gain-bandwidth product enabling stable AF amplification and moderate-speed digital switching. |
| RθJA | 625 °C/W - Thermal resistance from junction to ambient on minimum 1 oz copper FR4, guiding heatsinking decisions. |
| PD | 200 mW - Maximum steady-state power dissipation under specified board layout and still-air conditions. |
Pinout & Package
Package: SOT323 - Surface-mount plastic case, 0.006 g weight, UL 94V-0 rated molding compound, matte tin-plated leads solderable per MIL-STD-202.
| 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 input; −0.65 V typical VBE(on) at IC = −2 mA defines required drive level for turn-on. |
| 3 (Collector) | C | Output terminal; carries load current toward ground; voltage swing limited by VCEO = −45 V rating. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-qualified high-reliability construction | Qualified to AEC-Q101 stress test standards and manufactured in IATF 16949 certified facilities. |
| Green, halogen- and antimony-free packaging | Meets RoHS 3 (2015/863/EU); Br + Cl ≤ 1500 ppm, Sb ≤ 1000 ppm - supports eco-compliance programs. |
| Low VCE(sat) at medium current | −250 mV max at IC = −100 mA / IB = −5 mA - enables efficient saturated switching in logic-level interfaces. |
| Stable hFE across temperature | Typical hFE variation <±20% from −50°C to +150°C - reduces need for gain-compensating bias networks. |
| SOT323 tape-and-reel packaging | 7-inch reel, 3000 units - compatible with high-volume automated pick-and-place assembly. |
Applications
| Audio Pre-amplifier Stage | Level-Shifting Interface |
|---|---|
|
Use Scenario: Amplifying microphone or sensor output signals in portable audio devices before ADC sampling. IC Role / Device Role / Timing Role: PNP common-emitter amplifier providing 20–30 dB voltage gain with minimal distortion at 20 Hz–20 kHz. Use Value: High hFE group B ensures consistent gain without trimming; low noise figure (NF ≤ 10 dB) preserves SNR in weak-signal paths. |
Use Scenario: Translating 3.3 V logic outputs to 5 V or 12 V loads in mixed-voltage microcontroller systems. IC Role / Device Role / Timing Role: Active-low open-collector driver configured as inverting level shifter with pull-up resistor. Use Value: VCEO = −45 V allows safe operation with 12 V rail; fast fT supports >1 MHz toggle rates in digital control lines. |
| LED Current Switch | Discrete Power Sequencing |
|
Use Scenario: Driving indicator LEDs or small solenoids from low-power MCU GPIO pins. IC Role / Device Role / Timing Role: Saturated PNP switch controlling current path from supply rail to LED cathode. Use Value: VCE(sat) ≤ −300 mV at IC = −10 mA minimizes voltage drop and heat generation in compact layouts. |
Use Scenario: Enabling/disabling power rails in multi-rail embedded systems using discrete sequencing logic. IC Role / Device Role / Timing Role: Discrete timing element in RC-triggered enable chain for controlled power-up sequence. Use Value: Stable hFE and low leakage (ICBO ≤ −4 µA at 150°C) ensure reliable turn-on/turn-off margins over temperature. |
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-7-F | Same electrical specs but SOT23 package (larger footprint, RθJA = 400 °C/W). | Less suitable for ultra-dense layouts; better thermal margin in high-power analog stages. | Select when board real estate permits and thermal headroom is prioritized over miniaturization. |
| MMBT857LT1G | Identical SOT323 package, same VCEO/IC, but hFE Group C (420–800) and higher VBE(sat). | Higher gain improves bias stability in low-current sensors but increases saturation voltage at high IC. | Prefer for precision low-IC amplifiers; avoid where VCE(sat) < −250 mV is critical at >10 mA. |
Compared with BC857B-7-F and MMBT857LT1G, BC857BW-7-F uniquely balances compact SOT323 size, mid-range hFE consistency, and low saturation voltage-making it optimal for cost-sensitive, space-constrained switching and AF amplification where thermal and gain trade-offs must be tightly controlled.
Availability
BC857BW-7-F is available at Aetrix Electronics and suitable for audio pre-amplifier stages, level-shifting interfaces, and LED current switching requiring stable component supply and JEDEC-qualified reliability.
Supply support for BC857BW-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, manufacturing, and sales operations across Asia, Europe, and North America.
The BC856AW–BC858CW series targets high-volume, cost-sensitive industrial and consumer applications requiring robust, RoHS-compliant PNP transistors with validated thermal and switching performance in miniature packages.
FAQ
Is BC857BW-7-F automotive-grade qualified?
No, BC857BW-7-F is a standard-grade part. For automotive applications, Diodes offers the BC857BWQ-13-F variant, which is AEC-Q101 qualified, PPAP-capable, and manufactured in IATF 16949 certified facilities. The "Q" suffix denotes automotive qualification.
What is the maximum operating temperature for BC857BW-7-F?
The BC857BW-7-F has an operating junction temperature range of −55°C to +150°C. At +150°C ambient, its maximum continuous collector current drops to −4 mA due to thermal derating, as shown in Figure 1 of DS30251 Rev. 12-2.
Can BC857BW-7-F replace BC857C in a circuit?
Yes, but only if gain tolerance is acceptable: BC857BW-7-F is Group B (hFE = 220–475), while BC857C is Group C (hFE = 420–800). Circuits relying on minimum hFE ≥ 420 may experience reduced drive strength or bias shift with the Group B version.
Does BC857BW-7-F require special PCB layout considerations?
Yes - use the recommended SOT323 pad layout (C = 0.65 mm, G = 1.30 mm, X = 0.47 mm, Y = 0.60 mm, Y1 = 2.50 mm) from Diodes' package outline document. Avoid excessive copper pour under the device to prevent thermal runaway; maintain ≥0.25 mm clearance to adjacent traces.
BC857BW-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- 200 mW
- Frequency - Transition:
- 200MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC857BW-7-F FAQ
1.How can I place an order for BC857BW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BW-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 BC857BW-7-F reliable?
The price and inventory of BC857BW-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 BC857BW-7-F is usually 5 days.
3.What payment methods are accepted for BC857BW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BW-7-F?
BC857BW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BW-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 BC857BW-7-F?
For technical support, including BC857BW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BW-7-F requirements.
6.How does Aetrix verify that BC857BW-7-F is sourced from the original manufacturer or authorized distributors?
All BC857BW-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 BC857BW-7-F meets industry standards.
7.What is the process for return or replacement of BC857BW-7-F?
All BC857BW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC857BW-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 BC857BW-7-F part is unused and in its original packaging.
Return procedure for BC857BW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857BW-7-F Tags
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MMBT3906LT1G
onsemi
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Diodes Incorporated
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MMBT3904LT1G
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onsemi
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Nexperia USA Inc.
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MMBTA06LT1G
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