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onsemi BC307BTA
- Part No.:
- BC307BTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC307BTA.pdf
- Description:
- TRANS PNP 45V 0.1A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,997
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Product details
Overview
BC307BTA from Fairchild Semiconductor is a PNP epitaxial silicon transistor in TO-92 package, rated for -45 V VCEO, -100 mA IC, and 500 mW PC, with hFE of 180–460 (Class B), used in low-noise audio preamplifier stages and general-purpose switching circuits.
For engineers reviewing the BC307BTA datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, TO-92 mechanical compatibility, guaranteed hFE classification B, VCE(sat) ≤ –0.5 V at –10 mA/–0.5 mA, and noise figure ≤ 4 dB at 1 kHz for small-signal amplification tasks.
Technical Context
This device operates as a medium-gain, low-noise PNP bipolar junction transistor optimized for linear amplification and saturated switching. Its hFE range (180–460) ensures predictable DC bias stability across production lots, while fT = 130 MHz supports audio-frequency and low-speed digital signal handling.
Designed for operation at TJ ≤ 150°C and TSTG = –55 to 150°C, it features low Cob (6 pF) and Cib (12 pF) enabling stable high-frequency gain without parasitic oscillation in common-emitter configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | –45 V: Maximum safe collector-emitter voltage before breakdown in open-base condition. |
| IC (DC) | –100 mA: Continuous collector current rating defining maximum linear/saturated load drive capability. |
| PC | 500 mW: Total power dissipation limit at TA = 25°C, requiring thermal derating above ambient. |
| hFE Class | B (180–460): Guaranteed DC current gain range at VCE = –5 V, IC = –2 mA for consistent bias design. |
| VCE(sat) | –0.5 V max at IC = –10 mA, IB = –0.5 mA: Confirmed low saturation voltage for efficient switching. |
| NF | ≤ 4 dB at 1 kHz: Verified low-noise performance suitable for microphone preamp and sensor interface stages. |
Pinout & Package
BC307BTA is housed in a standard TO-92 plastic package with 3 leads, lead spacing 1.27 mm, body length 4.58 mm, and overall height 3.86 mm - compatible with manual soldering and wave soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Collector | Main current sink terminal; connected to most negative supply rail in PNP common-emitter amplifier or switch. |
| 2 | Base | Control input; requires negative current relative to emitter to turn on; bias resistor network referenced here. |
| 3 | Emitter | Current source terminal; typically tied to circuit ground or positive rail in PNP configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise amplification | NF ≤ 4 dB at 1 kHz enables clean signal gain in microphone and sensor front-end stages. |
| Guaranteed hFE classification | Class B (180–460) ensures predictable DC operating point without binning or test adjustment. |
| High fT | 130 MHz bandwidth supports full-audio-range amplification and fast-switching applications up to ~100 kHz. |
| Low output capacitance | Cob = 6 pF minimizes Miller effect, improving high-frequency stability in CE amplifier designs. |
Applications
| Audio Preamp Stage | Level-Shifting Switch |
|---|---|
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable audio devices. IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration for linearity. Use Value: NF ≤ 4 dB and hFE ≥ 180 ensure high SNR and stable gain without external feedback trimming. | Use Scenario: Inverting logic-level translation between 5 V microcontroller outputs and –12 V analog subsystems. IC Role / Device Role / Timing Role: Saturated PNP switch controlling current flow from negative rail to load. Use Value: VCE(sat) ≤ –0.5 V at –10 mA reduces power loss and heat generation during active conduction. |
| Current Mirror Reference | Discrete Op-Amp Input Pair |
Use Scenario: Building matched current sources in discrete instrumentation amplifier bias networks. IC Role / Device Role / Timing Role: One leg of a PNP current mirror with emitter resistors for thermal tracking. Use Value: Tight hFE spread (180–460) and low VBE(on) variation (–0.55 to –0.7 V) improve mirror accuracy. | Use Scenario: Differential input stage in discrete rail-to-rail op-amps for industrial sensor conditioning. IC Role / Device Role / Timing Role: Complementary PNP pair forming the first gain stage with common-base topology. Use Value: Cib = 12 pF and fT = 130 MHz support wideband differential gain with minimal phase shift. |
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 |
|---|---|---|---|
| BC327-40 | Same TO-92 package; hFE = 250–630 (higher gain class); VCEO = –45 V identical; NF not specified. | Higher hFE may require bias network recalibration; no guaranteed noise spec for audio-critical use. | Select BC327-40 only when higher DC gain is prioritized over verified low-noise performance. |
| PN2907A | TO-92; VCEO = –60 V (higher); hFE = 100–300 (lower min); VCE(sat) = –0.6 V typical (worse). | Greater voltage margin but reduced gain consistency and higher saturation loss in switching. | Choose PN2907A where absolute breakdown voltage headroom outweighs gain and noise requirements. |
Compared with BC307BTA, BC327-40 offers higher hFE but lacks noise certification, while PN2907A provides superior voltage rating at the cost of gain linearity and saturation efficiency - making BC307BTA optimal for balanced low-noise, medium-gain, and low-loss switching needs.
Availability
BC307BTA is available at Aetrix Electronics and suitable for audio preamplifiers, discrete logic level shifters, current mirror references, and differential input stages requiring stable component supply and long-term obsolescence management.
Supply support for BC307BTA 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog, discrete, and power management ICs before its acquisition by ON Semiconductor in 2016.
The BC307BTA belongs to Fairchild's legacy BC307/308/309 PNP transistor family, engineered for general-purpose amplification and switching in consumer, industrial, and instrumentation equipment.
FAQ
What is the exact hFE range for BC307BTA?
The BC307BTA is classified as Class B, with a guaranteed DC current gain (hFE) range of 180 to 460 when measured at VCE = –5 V and IC = –2 mA. This specification is explicitly defined in the Fairchild BC307/308/309 datasheet Rev. A2 and applies strictly to the BC307BTA variant.
Is BC307BTA suitable for low-noise audio applications?
Yes, BC307BTA is suitable for low-noise audio applications: its noise figure is specified as ≤ 4 dB at VCE = –5 V, IC = –0.2 mA, RG = 2 kΩ, and f = 1 kHz. This value is confirmed in the official Fairchild datasheet and makes BC307BTA appropriate for microphone preamplifier and sensor interface stages.
What is the pinout configuration of BC307BTA?
The BC307BTA uses a standard TO-92 package with pin 1 = Collector, pin 2 = Base, and pin 3 = Emitter when viewed with flat side facing forward and leads pointing downward. This pinout is consistent across Fairchild's BC307/308/309 series and verified in the package dimension diagram of the Rev. A2 datasheet.
Does BC307BTA have the same specifications as BC307?
Yes - BC307BTA is the Fairchild-marked version of the BC307 transistor with Class B hFE grading. All absolute maximum ratings, electrical characteristics, and package dimensions match the BC307 entry in the shared BC307/308/309 datasheet; "BTA" denotes the manufacturer's internal suffix for TO-92 packaging and hFE binning.
What is the maximum operating junction temperature for BC307BTA?
The maximum junction temperature (TJ) for BC307BTA is 150°C, as stated in the Absolute Maximum Ratings table of the Fairchild datasheet. This rating defines the upper thermal limit for reliable operation and must be respected via appropriate PCB copper area, ambient derating, and power dissipation calculations.
BC307BTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 180 @ 2mA, 5V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 130MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BC307BTA FAQ
1.How can I place an order for BC307BTA through Aetrix?
Please submit a Request for Quotation (RFQ) for BC307BTA 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 BC307BTA reliable?
The price and inventory of BC307BTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC307BTA is usually 5 days.
3.What payment methods are accepted for BC307BTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC307BTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC307BTA?
BC307BTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC307BTA 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 BC307BTA?
For technical support, including BC307BTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC307BTA requirements.
6.How does Aetrix verify that BC307BTA is sourced from the original manufacturer or authorized distributors?
All BC307BTA 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 BC307BTA meets industry standards.
7.What is the process for return or replacement of BC307BTA?
All BC307BTA units undergo pre-shipment inspection (PSI). If there is an issue with BC307BTA, 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 BC307BTA part is unused and in its original packaging.
Return procedure for BC307BTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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