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Diodes Incorporated BC858AW-7-F
- Part No.:
- BC858AW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC858AW-7-F.pdf
- Description:
- TRANS PNP 30V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:7,629
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Product details
Overview
BC858AW-7-F from Diodes Incorporated is a PNP small-signal transistor in SOT323 package, rated for VCEO = −30 V, IC = −100 mA, and hFE = 420–800 (Group C), optimized for switching and audio-frequency amplification in space-constrained PCBs.
For engineers reviewing the BC858AW-7-F datasheet, BC858AW-7-F pinout, BC858AW-7-F application, or BC858AW-7-F equivalent, key selection criteria include guaranteed high DC current gain at low collector currents, low VCE(sat) under moderate drive, thermal performance on FR4, and RoHS-compliant green packaging for consumer and industrial assembly lines.
Technical Context
This device operates as a discrete PNP bipolar junction transistor with fixed emitter-base and collector-base junction structures. Its Group C hFE binning ensures consistent gain across production lots, and its fT ≥ 100 MHz supports stable AF amplification up to ~20 kHz with margin.
Designed for surface-mount automatic insertion, it uses matte tin-plated leads solderable per MIL-STD-202 Method 208 and meets J-STD-020 moisture sensitivity Level 1. Thermal resistance RθJA = 625 °C/W is specified for minimum 1 oz copper pad layout on single-sided FR4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −30 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC | −100 mA - Continuous DC collector current rating; defines maximum linear/switching load capability. |
| hFE (Group C) | 420–800 - Guaranteed DC current gain range at VCE = −5 V, IC = −2 mA; enables predictable base drive sizing. |
| VCE(sat) | −300 mV max at IC = −10 mA, IB = −0.5 mA - Low saturation voltage reduces power loss in switching applications. |
| fT | 100–200 MHz - Gain-bandwidth product confirming usable frequency response beyond audio band. |
| PD | 200 mW - Maximum steady-state power dissipation on standard FR4 layout; limits thermal derating above 25°C ambient. |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount case (2.15 mm × 2.10 mm × 0.95 mm), UL 94V-0 rated, 0.006 g weight, lead-free and halogen-free "Green" compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current sink terminal; connected to higher potential in PNP operation; requires proper grounding or bias reference. |
| 2 (Base) | B | Control input; reverse-biased relative to emitter to turn device on; requires current-limited drive for saturation. |
| 3 (Collector) | C | Output terminal; carries load current toward lower potential; must remain ≤ VCEO below emitter voltage. |
Key Features
| Feature | Design Value |
|---|---|
| High hFE Group C binning | Guaranteed 420–800 gain at 2 mA enables precise, low-base-current biasing in amplifier stages. |
| SOT323 footprint compatibility | Standardized 0.65 mm pitch allows use with automated pick-and-place equipment and reflow profiles for high-yield SMT lines. |
| Low VCE(sat) at 10 mA | ≤ −300 mV ensures <3 mW conduction loss in switching nodes, improving efficiency in discrete logic or LED drivers. |
| JEDEC-qualified reliability | Qualified to AEC-Q101 stress test standards for high-reliability industrial and automotive-adjacent applications. |
Applications
| Audio Pre-Amplifier Stage | Discrete Logic Inverter |
|---|---|
Use Scenario: Low-noise voltage amplification of microphone or line-level signals in portable audio devices. IC Role / Device Role / Timing Role: PNP active load and gain stage in Class-A common-emitter topology. Use Value: High hFE and low NF (≤10 dB) preserve signal integrity while minimizing base drive complexity. | Use Scenario: Level-shifting and inversion in 3.3 V or 5 V digital control circuits where IC logic gates are unavailable. IC Role / Device Role / Timing Role: Saturated switch implementing NOT function with defined VOL/VOH thresholds. Use Value: Fast turn-on/off (enabled by fT ≥ 100 MHz) and low VCE(sat) ensure clean logic transitions and minimal static power. |
| LED Current Sink Driver | Power Supply Enable Switch |
Use Scenario: Constant-current sinking for indicator or status LEDs in battery-powered instrumentation panels. IC Role / Device Role / Timing Role: Linear or switched current regulator controlling LED anode-to-VCC path. Use Value: Tight hFE tolerance and low thermal resistance allow stable current setting without external feedback. | Use Scenario: Enabling/disabling auxiliary rails (e.g., sensor bias, display backlight) via microcontroller GPIO. IC Role / Device Role / Timing Role: High-side or low-side pass element controlled by MCU output pin. Use Value: −30 V VCEO and −100 mA IC support direct interface with 24 V industrial supplies and robust fault margin. |
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 |
|---|---|---|---|
| BC858B-7-F | hFE = 220–475 (Group B); lower gain spread than BC858AW-7-F. | Suitable where tighter gain control is needed but absolute maximum gain is not required. | Select when design tolerates reduced current gain margin but benefits from narrower hFE distribution. |
| MMBT3906LT1G | VCEO = −40 V; hFE = 100–300 (typical); SOT-23 package (larger footprint). | Higher voltage rating supports wider supply ranges; larger package eases hand-soldering and thermal management. | Choose for designs needing >30 V blocking or manual prototyping, accepting lower gain and larger board area. |
Compared with BC858B-7-F, the BC858AW-7-F offers higher guaranteed gain for low-drive amplifier stages; versus MMBT3906LT1G, it trades voltage headroom and package size for superior hFE consistency and smaller footprint in high-density layouts.
Availability
BC858AW-7-F is available at Aetrix Electronics and suitable for audio pre-amplifiers, discrete logic inverters, and LED current sink drivers requiring stable component supply, JEDEC-qualified reliability, and RoHS-compliant green packaging.
Supply support for BC858AW-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 the Americas.
The BC856AW–BC858CW series belongs to Diodes' small-signal transistor portfolio, engineered for cost-sensitive, high-volume consumer and industrial applications demanding consistent gain, low saturation voltage, and automated assembly compatibility.
FAQ
What is the maximum operating temperature for BC858AW-7-F?
The BC858AW-7-F has an operating junction temperature range of −55°C to +150°C. Its thermal resistance RθJA = 625 °C/W is measured on a standard 1 oz copper FR4 PCB; derating begins above +25°C ambient per Figure 1 in DS30251.
Is BC858AW-7-F suitable for automotive applications?
No-BC858AW-7-F is a standard-grade part. For automotive use, Diodes offers the Q-suffix variant BC858BWQ-13-F, qualified to AEC-Q101, PPAP-capable, and manufactured in IATF 16949 certified facilities.
How does the SOT323 package affect PCB layout?
The SOT323 footprint requires precise pad dimensions (E1 = 1.15–1.35 mm, e = 0.65 mm BSC) and 0.47 mm solder mask clearance. Its 0.95 mm height and 2.15 mm × 2.10 mm body demand tight spacing but enable high-density routing in compact designs.
What is the meaning of the 'K3A' marking on BC858AW-7-F?
'K3A' is the product type marking code per Diodes' ordering information: 'K' denotes the BC856–BC858 family, '3' indicates SOT323 package, and 'A' specifies the BC858A gain group (hFE = 125–250), though BC858AW-7-F is Group C-this reflects legacy coding; actual gain bin is confirmed by test data, not top-side mark.
BC858AW-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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):
- 30 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
BC858AW-7-F FAQ
1.How can I place an order for BC858AW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BC858AW-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 BC858AW-7-F reliable?
The price and inventory of BC858AW-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 BC858AW-7-F is usually 5 days.
3.What payment methods are accepted for BC858AW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC858AW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC858AW-7-F?
BC858AW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC858AW-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 BC858AW-7-F?
For technical support, including BC858AW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC858AW-7-F requirements.
6.How does Aetrix verify that BC858AW-7-F is sourced from the original manufacturer or authorized distributors?
All BC858AW-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 BC858AW-7-F meets industry standards.
7.What is the process for return or replacement of BC858AW-7-F?
All BC858AW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC858AW-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 BC858AW-7-F part is unused and in its original packaging.
Return procedure for BC858AW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC858AW-7-F Tags
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