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Diodes Incorporated BC857AW-7-F
- Part No.:
- BC857AW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857AW-7-F.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:5,748
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Product details
Overview
BC857AW-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 BC857AW-7-F datasheet, BC857AW-7-F pinout, BC857AW-7-F application, or BC857AW-7-F equivalent, key selection criteria include guaranteed DC current gain at low collector current (−2 mA), low VCE(sat) (−75 mV typ. @ −10 mA/−0.5 mA), thermal resistance (625 °C/W), and automotive-grade qualification path via Q-suffix variants.
Technical Context
This device operates as a general-purpose PNP bipolar junction transistor with complementary NPN pairing (e.g., BC847AW). Its design supports linear amplification and saturated switching, with fT = 100–200 MHz enabling stable AF performance up to ~100 kHz and limited RF use.
It meets JEDEC high-reliability standards, features matte tin-plated leads compliant with MIL-STD-202 Method 208, and is qualified per J-STD-020 Level 1 moisture sensitivity-enabling standard reflow without baking.
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 limit defining usable load drive capability |
| hFE (Group B) | 220–475 - guaranteed DC current gain range at VCE = −5 V, IC = −2 mA for predictable biasing |
| VCE(sat) | −75 mV (typ.) @ IC = −10 mA, IB = −0.5 mA - low saturation voltage enabling efficient switching with minimal power loss |
| fT | 100–200 MHz - unity-gain frequency confirming suitability for audio amplification and moderate-speed digital switching |
| RθJA | 625 °C/W - thermal resistance indicating junction-to-ambient heat dissipation on minimal FR4 pad layout |
| PD | 200 mW - maximum steady-state power dissipation under specified board conditions |
Pinout & Package
Package: SOT323 - surface-mount plastic case, 0.006 g weight, UL 94V-0 rated molding compound, 8 mm tape width, 3000 units per 7-inch reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current exit terminal in PNP operation; connects to higher potential node in switching or bias networks |
| 2 (Base) | B | Control terminal; requires negative base current relative to emitter to turn on device |
| 3 (Collector) | C | Current entry terminal; typically tied to load or supply rail in common-emitter configurations |
Key Features
| Feature | Design Value |
|---|---|
| Complementary NPN pairing | Direct match with BC847AW enables balanced push-pull stages and differential amplifier designs |
| JEDEC high-reliability qualification | Validated per AEC-Q101-equivalent stress testing, supporting industrial and automotive-adjacent applications |
| Lead-free & halogen-free "Green" construction | Meets RoHS 3 (2015/863/EU) and IATF 16949 manufacturing requirements without antimony or bromine additives |
| Low VBE(sat) | −700 mV (typ.) @ IC = −10 mA/IB = −0.5 mA - reduces base drive power and improves switching efficiency |
Applications
| Audio Pre-amplifier Stage | Level-Shifting Interface |
|---|---|
Use Scenario: Amplifying microphone-level signals (≤10 mVpp) before ADC input in portable voice recorders. IC Role / Device Role / Timing Role: PNP common-emitter amplifier providing 20–30 dB voltage gain with low noise figure (10 dB @ 1 kHz). Use Value: High hFE group B ensures stable bias point across temperature; low VCE(sat) minimizes distortion at signal peaks. | Use Scenario: Translating 3.3 V logic outputs to −5 V control lines in legacy analog test equipment. IC Role / Device Role / Timing Role: Saturated PNP switch sinking current from −5 V rail to ground when base is pulled low. Use Value: Guaranteed VCE(sat) ≤ −300 mV at IC = −100 mA ensures reliable low-side switching with <0.3 V drop. |
| LED Current Sink Driver | Discrete Power Supply Enable |
Use Scenario: Driving 20 mA indicator LEDs from microcontroller GPIO pins in medical diagnostic panels. IC Role / Device Role / Timing Role: Low-power PNP current sink configured with fixed base resistor for constant LED current. Use Value: Tight hFE tolerance (220–475) enables ±5% LED brightness consistency without feedback. | Use Scenario: Enabling/disabling a −12 V LDO regulator output based on system power-good signal. IC Role / Device Role / Timing Role: High-side enable switch controlling regulator EN pin via open-collector interface. Use Value: VCEO = −45 V exceeds −12 V rail margin, ensuring robust blocking during fault conditions. |
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 SOT323 package, identical VCEO/IC, but hFE = 220–475 (Group B) - matches BC857AW-7-F exactly | No functional difference; marking code differs (K3A vs. K3B), same electrical specs and reliability | Select when K3B-marked reels align with production traceability requirements |
| MMBT857LT1G | Same VCEO (−45 V), IC (−100 mA), but hFE = 100–300 (lower gain spread); RθJA = 500 °C/W (better thermal performance) | Suitable where tighter thermal management is needed, but gain-critical bias networks may require redesign | Prefer for thermally constrained layouts; verify hFE min. meets circuit stability margin |
Compared with BC857AW-7-F, BC857B-7-F offers identical performance with alternate reel marking, while MMBT857LT1G trades gain consistency for improved thermal resistance-making it viable only where hFE variation is tolerable and board-level cooling is limited.
Availability
BC857AW-7-F is available at Aetrix Electronics and suitable for audio pre-amplifiers, level-shifting interfaces, and LED current sink drivers requiring stable component supply, consistent hFE binning, and RoHS-compliant packaging.
Supply support for BC857AW-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 ISO/TS 16949-certified wafer fabs and assembly facilities.
The BC856AW–BC858CW series targets cost-sensitive, high-volume consumer and industrial applications needing reliable, lead-free PNP transistors with standardized SOT323 footprint and JEDEC-qualified reliability.
FAQ
Is BC857AW-7-F suitable for automotive applications?
No-BC857AW-7-F is a standard-grade part. For automotive use, 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; this part lacks that designation and associated change control.
What does the "-7-F" suffix indicate in BC857AW-7-F?
The "-7-F" suffix specifies packaging: "7" denotes a 7-inch tape-and-reel format, and "F" indicates Diodes' standard lead-free, halogen-free ("Green") finish. The "K3A" marking on the device body confirms it belongs to the BC857A gain group (hFE 125–250), though datasheet Table 2 shows BC857AW is Group B (220–475); actual unit marking aligns with ordering code, not letter suffix alone.
Can BC857AW-7-F replace BC857C-7-F in an existing design?
Only if gain tolerance is non-critical. BC857AW-7-F is Group B (hFE 220–475), while BC857C-7-F is Group C (420–800). Substituting may cause over-biasing or thermal runaway in fixed-base resistor circuits. Verify operating point stability across temperature and production lot variation before interchange.
What is the maximum allowable PCB trace width for SOT323 pads per Diodes' recommendation?
Diodes specifies a minimum 1.30 mm pad length (G dimension) and 0.65 mm pad width (C dimension) for SOT323, with 0.47 mm spacing (X) between pads. Trace width should match pad width (0.65 mm) for thermal balance; wider traces increase heat spreading but risk solder bridging. Full layout guidance is published in Diodes' SOT323 package outline document (PN: SOT323-1).
BC857AW-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:
- 125 @ 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
BC857AW-7-F FAQ
1.How can I place an order for BC857AW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857AW-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 BC857AW-7-F reliable?
The price and inventory of BC857AW-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 BC857AW-7-F is usually 5 days.
3.What payment methods are accepted for BC857AW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857AW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857AW-7-F?
BC857AW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857AW-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 BC857AW-7-F?
For technical support, including BC857AW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857AW-7-F requirements.
6.How does Aetrix verify that BC857AW-7-F is sourced from the original manufacturer or authorized distributors?
All BC857AW-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 BC857AW-7-F meets industry standards.
7.What is the process for return or replacement of BC857AW-7-F?
All BC857AW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC857AW-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 BC857AW-7-F part is unused and in its original packaging.
Return procedure for BC857AW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857AW-7-F Tags
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