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onsemi BC808-40LT1G
- Part No.:
- BC808-40LT1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC808-40LT1G.pdf
- Description:
- TRANS PNP 25V 0.5A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,472
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Product details
Overview
BC808-40LT1G from onsemi is a PNP silicon general-purpose transistor in SOT-23 package, rated for −25 V VCEO, −500 mA continuous collector current, and 225 mW power dissipation on FR-5 board. It delivers DC current gain (hFE) of 250–600 at IC = −100 mA and VCE = −1.0 V, with VCE(sat) ≤ −0.7 V at IC = −500 mA/IB = −50 mA - used in low-voltage switching and linear amplification stages of industrial control modules.
For engineers reviewing the BC808-40LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed hFE binning (40–600), AEC-Q101 qualification, Pb-free RoHS compliance, and validated thermal performance on standard FR-5 PCBs.
Technical Context
This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with defined breakdown limits: V(BR)CEO = −25 V (IC = −10 mA), V(BR)CES = −30 V (VEB = 0), and V(BR)EBO = −5.0 V (IE = −1.0 A). Its fT = 100 MHz enables stable small-signal amplification up to mid-VHF range.
Thermal design is constrained by RJA = 556 °C/W on FR-5 board and 417 °C/W on alumina substrate. The device supports operation from −55 °C to +150 °C junction temperature, with ICBO ≤ −100 nA at VCB = −20 V and ≤ −5.0 A at TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −25 V - maximum safe collector-emitter voltage before avalanche breakdown under open-base condition |
| IC (continuous) | −500 mA - absolute maximum DC collector current without derating at TA = 25 °C |
| hFE (min–max) | 250–600 - guaranteed DC current gain range at IC = −100 mA, VCE = −1.0 V, enabling predictable biasing |
| VCE(sat) | ≤ −0.7 V - collector-emitter saturation voltage at IC = −500 mA/IB = −50 mA, limiting conduction loss in switch mode |
| fT | 100 MHz - transition frequency defining usable bandwidth for small-signal amplification |
| RJA (FR-5) | 556 °C/W - junction-to-ambient thermal resistance on standard 1.0 × 0.75 inch FR-5 board, guiding heatsinking requirements |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, 1.90 mm lead pitch, Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Current-controlled input terminal; requires −50 mA base drive for full saturation at −500 mA collector load |
| 2 | Emitter | Common reference terminal for PNP configuration; connected to higher potential rail in typical switch applications |
| 3 | Collector | Output current path; sinks load current when base is forward-biased relative to emitter |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47 |
| hFE binning (40–600) | Guaranteed minimum gain of 250 ensures consistent switching thresholds across production lots |
| Pb-free / RoHS compliant | Meets EU Directive 2011/65/EU and halogen-free/BFR-free requirements for environmentally regulated markets |
| Low VCE(sat) | ≤ −0.7 V at rated current reduces power loss and self-heating in high-duty-cycle switching |
Applications
| Industrial Power Switching | Automotive Body Control |
|---|---|
|
Use Scenario: Driving 12 V relay coils and LED indicator banks in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Low-side PNP switch controlling ground-return loads with TTL-compatible base drive. Use Value: VCE(sat) ≤ −0.7 V minimizes coil heating; hFE ≥ 250 ensures reliable turn-on with microcontroller GPIO outputs. |
Use Scenario: Controlling door lock actuators and mirror adjustment motors in vehicle body electronics modules. IC Role / Device Role / Timing Role: High-reliability PNP driver interfacing between MCU I/O and inductive loads. Use Value: AEC-Q101 qualification guarantees operation over −40 °C to +125 °C ambient; −25 V VCEO withstands load dump transients. |
| Consumer Appliance Control | IoT Sensor Node Biasing |
|
Use Scenario: Enabling/disabling 5 V solenoid valves and fan speed regulators in smart home HVAC systems. IC Role / Device Role / Timing Role: General-purpose PNP amplifier and switch in compact, cost-sensitive PCB layouts. Use Value: SOT-23 footprint saves board space; 225 mW PD supports continuous duty at room temperature without heatsink. |
Use Scenario: Providing stable bias current to precision analog front-end components in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Linear-mode current source for op-amp reference circuits and sensor excitation. Use Value: Tight hFE spread (250–600) and low ICBO (< −100 nA) ensure stable quiescent current over temperature and time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC807-40LT1G | Same package and pinout; lower VCEO = −45 V but hFE min = 250 at IC = −100 mA - identical gain binning | Preferred where higher breakdown margin is required without changing layout | Select BC807-40LT1G if system-level transient protection demands >−25 V collector rating |
| MMBT4403 | Same SOT-23 package; VCEO = −40 V, hFE = 100–300 (min 100), VCE(sat) = −0.75 V - narrower gain range and slightly higher saturation loss | Used in legacy designs where wider hFE tolerance is acceptable | Choose MMBT4403 only when existing BOM uses it and gain variation can be accommodated in circuit design |
Compared with BC808-40LT1G, BC807-40LT1G offers higher voltage headroom while maintaining identical gain and pinout, whereas MMBT4403 trades guaranteed high hFE for broader industry adoption - making BC808-40LT1G optimal for new designs needing robust, AEC-Q101-qualified PNP switching with tight gain control.
Availability
BC808-40LT1G is available at Aetrix Electronics and suitable for industrial power switching, automotive body control, and consumer appliance control requiring stable component supply and long-term lifecycle support.
Supply support for BC808-40LT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BC808-40LT1G belongs to onsemi's general-purpose bipolar transistor family designed for cost-effective, high-reliability discrete switching and amplification in space-constrained applications across automotive and industrial segments.
FAQ
What is the maximum operating temperature for BC808-40LT1G?
The BC808-40LT1G has a specified junction and storage temperature range of −55 °C to +150 °C. Its thermal resistance (RJA = 556 °C/W on FR-5 board) means that at 25 °C ambient and 225 mW dissipation, junction temperature rises by ~125 °C - staying within safe limits. Always verify actual board-level thermal performance using measured power and layout.
Is BC808-40LT1G pin-compatible with BC807-40LT1G?
Yes, BC808-40LT1G and BC807-40LT1G share identical SOT-23 package dimensions, pinout (Style 6: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector), and marking format. Both are AEC-Q101 qualified and RoHS compliant, enabling direct substitution where voltage rating allows.
Does BC808-40LT1G support automotive applications?
Yes, BC808-40LT1G is explicitly AEC-Q101 qualified and PPAP capable, with stress testing covering temperature cycling, high-temperature reverse bias, and electrostatic discharge per automotive reliability standards - making it suitable for body electronics, lighting, and non-safety-critical control modules.
What is the guaranteed hFE range for BC808-40LT1G at IC = −100 mA?
The BC808-40LT1G is binned to guarantee hFE between 250 and 600 when tested at IC = −100 mA and VCE = −1.0 V. This wide but controlled gain range ensures predictable base drive requirements across production lots without needing individual calibration.
Can BC808-40LT1G replace BC808-25LT1G in a design?
Yes - BC808-40LT1G is a direct upgrade to BC808-25LT1G with identical package, pinout, and electrical characteristics except for higher guaranteed hFE (250–600 vs. 160–400). No layout or schematic changes are needed; the improved gain enhances noise immunity and reduces base drive current requirements.
BC808-40LT1G 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):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 25 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 250 @ 100mA, 1V
- 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)
BC808-40LT1G FAQ
1.How can I place an order for BC808-40LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BC808-40LT1G 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 BC808-40LT1G reliable?
The price and inventory of BC808-40LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC808-40LT1G is usually 5 days.
3.What payment methods are accepted for BC808-40LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC808-40LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC808-40LT1G?
BC808-40LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC808-40LT1G 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 BC808-40LT1G?
For technical support, including BC808-40LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC808-40LT1G requirements.
6.How does Aetrix verify that BC808-40LT1G is sourced from the original manufacturer or authorized distributors?
All BC808-40LT1G 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 BC808-40LT1G meets industry standards.
7.What is the process for return or replacement of BC808-40LT1G?
All BC808-40LT1G units undergo pre-shipment inspection (PSI). If there is an issue with BC808-40LT1G, 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 BC808-40LT1G part is unused and in its original packaging.
Return procedure for BC808-40LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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