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onsemi BC856ALT3G
- Part No.:
- BC856ALT3G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC856ALT3G.pdf
- Description:
- TRANS PNP 65V 0.1A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,090
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Product details
Overview
BC856ALT3G from onsemi is a PNP silicon general-purpose transistor in SOT-23 package, rated for −65 V VCEO, −100 mA IC continuous, and 100 MHz fT. It delivers hFE = 125–250 (A-grade), VCE(sat) ≤ −0.3 V at −10 mA/−0.5 mA, and is AEC-Q101 qualified for automotive signal switching and biasing circuits.
For engineers reviewing the BC856ALT3G datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating data, SOT-23 terminal mapping, automotive qualification status, and two validated alternative parts for design flexibility and supply continuity.
Technical Context
This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with defined breakdown limits: V(BR)CEO = −65 V (IC = −10 mA), V(BR)CBO = −80 V, and V(BR)EBO = −5.0 V. Its DC current gain spans 125–250 at −10 mA/−5.0 V, supporting stable bias networks in low-power analog stages.
Small-signal performance includes fT = 100 MHz at −10 mA/−5.0 V, Cob = 4.5 pF at −10 V, and NF = 10 dB at −0.2 mA/−5.0 V/2 kHz - confirming suitability for audio preamplifier and RF front-end switching where gain-bandwidth and noise matter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −65 V - Maximum collector-emitter voltage before breakdown; enables use in 48 V automotive power rails with safety margin. |
| IC Continuous | −100 mA - Sustained collector current handling; supports relay drivers and LED sink switches without forced cooling. |
| hFE Range | 125–250 @ −10 mA/−5.0 V - Tight DC gain binning ensures predictable base drive requirements in linear amplifiers. |
| VCE(sat) | ≤ −0.3 V @ −10 mA/−0.5 mA - Low saturation voltage minimizes power loss in high-efficiency switching applications. |
| fT | 100 MHz - Enables stable operation up to VHF band in oscillator and amplifier stages. |
| PD (FR-5) | 225 mW @ 25°C, derated 1.8 mW/°C - Defines thermal envelope for PCB layout on standard epoxy boards. |
| AEC-Q101 | Qualified - Confirmed reliability for automotive infotainment, body control modules, and sensor interfaces. |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm, surface-mount, Pb-free, RoHS compliant. Thermal resistance RJA = 556 °C/W on FR-5 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input; requires current-limited drive to achieve specified hFE and switching speed. |
| 2 | Emitter | Common reference node; connected to higher potential (e.g., VCC) in PNP switch configurations. |
| 3 | Collector | Output node; sinks current to load when base is forward-biased; must respect VCEO and safe operating area limits. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive temperature range (−40°C to +150°C) and lifetime reliability per stress test protocols. |
| PNP polarity with −65 V rating | Enables high-side switching in negative-rail systems and complementary pairing with NPN devices like BC846 series. |
| Low VCE(sat) (≤ −0.3 V) | Reduces conduction loss in battery-powered sensor nodes and low-voltage logic-level translators. |
| 100 MHz fT | Supports stable small-signal amplification in audio preamps and RF detector stages up to 30 MHz. |
| RoHS / Halogen-Free | Meets global environmental compliance for industrial and consumer end-equipment without material substitution risk. |
Applications
| Automotive Door Module Switching | Industrial Sensor Bias Network |
|---|---|
Use Scenario: Controlling window lift motor enable signals and mirror fold/unfold relays in door control units. IC Role / Device Role / Timing Role: PNP switch providing high-side current sink for 12 V relay coils with fast turn-off (tf = 40 ns). Use Value: −65 V VCEO withstands load-dump transients; AEC-Q101 ensures 15-year field life under vibration and thermal cycling. |
Use Scenario: Setting precise quiescent current in thermistor-based temperature sensing front-ends. IC Role / Device Role / Timing Role: Active load and current source in Wheatstone bridge amplifier stages. Use Value: Tight hFE bin (125–250) reduces calibration drift; low NF (10 dB) preserves signal-to-noise ratio in µV-level outputs. |
| Consumer Audio Preamp Stage | Medical Portable Device Power Control |
Use Scenario: Low-noise voltage amplifier in headphone driver IC input stage. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with 100 MHz fT and 10 dB NF. Use Value: fT > 10× audio bandwidth ensures flat gain response; Cob = 4.5 pF minimizes Miller effect distortion. |
Use Scenario: Enabling/disabling auxiliary power rails in portable ECG monitors during sleep mode. IC Role / Device Role / Timing Role: Low-leakage PNP switch isolating 3.3 V subsystems with ICBO ≤ −15 nA at 150°C. Use Value: −15 nA leakage at high temperature prevents battery drain; SOT-23 footprint saves space in compact PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC856BLT3G | Higher hFE bin: 220–475 @ −10 mA/−5.0 V; same VCEO, VCE(sat), and package. | Better suited for high-gain feedback loops where base drive current must be minimized. | Select BC856BLT3G when circuit stability requires ≥220 hFE at nominal operating point. |
| MMBT3906LT3G | Lower VCEO (−40 V), wider hFE range (100–300), identical SOT-23 footprint and pinout. | Not AEC-Q101 qualified; suitable for commercial-grade consumer electronics but not automotive. | Choose MMBT3906LT3G only for cost-sensitive non-automotive designs where −40 V rating suffices. |
Compared with BC856ALT3G, BC856BLT3G offers higher gain for reduced base drive burden, while MMBT3906LT3G trades automotive qualification and voltage rating for broader commercial availability - making BC856ALT3G the optimal choice for AEC-Q101-compliant 48 V system switching.
Availability
BC856ALT3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and portable medical device power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BC856ALT3G 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
onsemi is a global semiconductor supplier focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The BC856ALT3G belongs to onsemi's BC856ALT1G Series of AEC-Q101-qualified PNP transistors, designed specifically for robust signal switching and biasing in harsh-environment automotive electronics.
FAQ
What is the maximum collector-emitter voltage rating for BC856ALT3G?
The BC856ALT3G has a maximum collector-emitter voltage (VCEO) rating of −65 V at TA = 25°C, verified per onsemi's April 2023 datasheet revision. This rating applies to the BC856 variant within the BC856ALT1G Series and remains valid up to TJ = 150°C with appropriate thermal derating. The BC856ALT3G must not be operated beyond this limit to avoid irreversible breakdown.
Is BC856ALT3G pin-compatible with BC856BLT3G?
Yes, BC856ALT3G is pin-compatible with BC856BLT3G - both use identical SOT-23 (TO-236) package with Style 6 pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector). They share identical mechanical dimensions, thermal characteristics, and absolute maximum ratings except for hFE binning; no PCB layout change is required when substituting between these variants.
Does BC856ALT3G meet automotive reliability standards?
Yes, BC856ALT3G is AEC-Q101 qualified and PPAP capable, as confirmed in the official onsemi datasheet. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life - ensuring suitability for automotive infotainment, lighting control, and body electronics deployed across −40°C to +150°C ambient conditions.
What is the typical current gain (hFE) of BC856ALT3G at −10 mA collector current?
The BC856ALT3G exhibits hFE = 125–250 when tested at IC = −10 mA and VCE = −5.0 V, per the "ON CHARACTERISTICS" table in the onsemi datasheet. This A-grade binning ensures consistent base drive requirements in production designs, with typical values centered near 180 under those conditions.
Can BC856ALT3G be used in high-frequency amplifier applications?
Yes, BC856ALT3G supports high-frequency amplifier use with a current-gain bandwidth product (fT) of 100 MHz at IC = −10 mA and VCE = −5.0 V. Its 4.5 pF output capacitance (Cob) and 10 dB noise figure at 1 kHz make it suitable for VHF preamplifiers, RF detectors, and audio gain stages - provided layout minimizes parasitic inductance and grounding is optimized.
BC856ALT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 125 @ 2mA, 5V
- Power - Max:
- 300 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BC856ALT3G FAQ
1.How can I place an order for BC856ALT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for BC856ALT3G 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 BC856ALT3G reliable?
The price and inventory of BC856ALT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856ALT3G is usually 5 days.
3.What payment methods are accepted for BC856ALT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856ALT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC856ALT3G?
BC856ALT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC856ALT3G 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 BC856ALT3G?
For technical support, including BC856ALT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856ALT3G requirements.
6.How does Aetrix verify that BC856ALT3G is sourced from the original manufacturer or authorized distributors?
All BC856ALT3G 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 BC856ALT3G meets industry standards.
7.What is the process for return or replacement of BC856ALT3G?
All BC856ALT3G units undergo pre-shipment inspection (PSI). If there is an issue with BC856ALT3G, 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 BC856ALT3G part is unused and in its original packaging.
Return procedure for BC856ALT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC856ALT3G Tags
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onsemi
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