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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi BC307C

Name: BC307C
Brand: onsemi
SKU: BC307C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC307C

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: BC307C.pdf

Description:: TRANS PNP 45V 0.1A TO92

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC307C from onsemi is a PNP silicon small-signal amplifier transistor in TO-92 package, rated for −45 V_CEO, −100 mA_C, and 350 mW dissipation at 25°C ambient. It delivers DC current gain (h_FE) of 200–500 at −10 mA_C/−5 V_CE, with f_T = 280 MHz and low noise figure (2.0 dB typical), commonly used in audio preamplifier stages and discrete bias networks.

For engineers reviewing the BC307C datasheet, pinout, applications, or equivalent options, key selection considerations include its guaranteed h_FE bin (C-grade), V_CEO derating above 25°C, thermal resistance (R_JA = 357°C/W), and Pb-free TO-92 mechanical compatibility with legacy through-hole layouts.

Technical Context

The BC307C operates as a linear PNP bipolar junction transistor optimized for low-noise amplification and switching in analog signal paths. Its h_FE range (200–500) and tight V_BE(on) (−0.55 to −0.7 V) support stable biasing in emitter-follower and common-emitter configurations. The device exhibits C_cbo = 6.0 pF and f_T = 280 MHz, enabling use up to mid-VHF frequencies.

Thermal design requires attention to R_JA = 357°C/W and R_JC = 125°C/W - power derating is mandatory above 25°C ambient, with full derating to zero at +150°C junction temperature. The −5.0 V_EBO rating limits base-emitter reverse voltage in active bias schemes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 Vdc - maximum collector-to-emitter voltage before breakdown; sets safe operating voltage headroom in negative-rail amplifier designs
I_C (max)	−100 mAdc - continuous collector current limit; defines upper bound for load-driving capability in switching or Class-A stages
h_FE @ −10 mA	200–500 - guaranteed DC current gain range for BC307C grade; enables predictable bias point stability in discrete gain blocks
f_T	280 MHz - transition frequency; supports stable amplification up to ~100 MHz with proper layout and compensation
NF	2.0 dB typical - noise figure at 1 kHz/0.2 mA; critical for low-noise preamp input stages in audio and sensor interfaces
R_JA	357°C/W - junction-to-ambient thermal resistance; requires heatsinking or airflow for >100 mW sustained dissipation
V_BE(on)	−0.55 to −0.7 V - base-emitter turn-on voltage; determines required base drive level and quiescent current setting accuracy

Pinout & Package

BC307C is housed in a standard TO-92 plastic package (Case 29, Style 17), with lead-forming compliant to ANSI Y14.5M. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - verified per ON Semiconductor marking diagram and mechanical drawings.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Main current sink terminal	Connected to negative supply rail or load return path; carries full emitter current minus base current
2 (Base)	Control input node	Receives forward-biased current to modulate collector-emitter conduction; sensitive to ESD and leakage in high-impedance bias networks
3 (Emitter)	Current source reference	Typically tied to ground or negative rail; provides stable reference for emitter-degeneration resistors in gain-setting networks

Key Features

Feature	Design Value
Pb-free TO-92 packaging	Fully RoHS-compliant construction with verified solderability per ON Semiconductor's Pb-Free Soldering Manual
Guaranteed h_FE bin (C-grade)	200–500 at −10 mA/−5 V - tighter gain spread than BC307B (120–270), reducing need for post-build gain trimming
Low noise figure	2.0 dB typical at 1 kHz - enables use in microphone preamps and instrumentation front-ends without added noise penalty
High f_T	280 MHz - supports wideband analog signal conditioning and RF detector applications up to 100 MHz
−55°C to +150°C operation	Full junction temperature range validated - suitable for automotive under-hood and industrial control environments

Applications

Audio Preamp Stage	Discrete Bias Generator
Use Scenario: Low-noise voltage amplification of electret microphone output prior to ADC sampling. IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: 2.0 dB NF and 200–500 h_FE ensure high SNR and repeatable gain without feedback loop instability.	Use Scenario: Generating stable negative bias voltage for op-amp input stage referencing in dual-supply systems. IC Role / Device Role / Timing Role: Emitter-follower configured PNP transistor providing low-impedance, temperature-compensated bias node. Use Value: Tight V_BE(on) (−0.55 to −0.7 V) and low R_ob enable precise, drift-resistant bias voltage tracking across temperature.
LED Driver Switch	Level Translation Interface
Use Scenario: Driving high-brightness red/green LEDs from microcontroller GPIO pins with inverted logic. IC Role / Device Role / Timing Role: Saturated PNP switch controlling LED anode connection to positive rail. Use Value: V_CE(sat) ≤ −0.3 V at −100 mA ensures minimal voltage drop and efficient power delivery to LED loads.	Use Scenario: Translating 3.3 V logic signals to −5 V or −12 V domains in mixed-voltage analog subsystems. IC Role / Device Role / Timing Role: Inverting level shifter using common-emitter topology with pull-up resistor to negative supply. Use Value: Guaranteed −45 V_CEO and −50 V_CBO ratings allow safe operation across wide negative rail swings without breakdown.

Audio Preamp Stage

Discrete Bias Generator

Use Scenario: Low-noise voltage amplification of electret microphone output prior to ADC sampling.

IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration.

Use Value: 2.0 dB NF and 200–500 h_FE ensure high SNR and repeatable gain without feedback loop instability.

Use Scenario: Generating stable negative bias voltage for op-amp input stage referencing in dual-supply systems.

IC Role / Device Role / Timing Role: Emitter-follower configured PNP transistor providing low-impedance, temperature-compensated bias node.

Use Value: Tight V_BE(on) (−0.55 to −0.7 V) and low R_ob enable precise, drift-resistant bias voltage tracking across temperature.

LED Driver Switch

Level Translation Interface

Use Scenario: Driving high-brightness red/green LEDs from microcontroller GPIO pins with inverted logic.

IC Role / Device Role / Timing Role: Saturated PNP switch controlling LED anode connection to positive rail.

Use Value: V_CE(sat) ≤ −0.3 V at −100 mA ensures minimal voltage drop and efficient power delivery to LED loads.

Use Scenario: Translating 3.3 V logic signals to −5 V or −12 V domains in mixed-voltage analog subsystems.

IC Role / Device Role / Timing Role: Inverting level shifter using common-emitter topology with pull-up resistor to negative supply.

Use Value: Guaranteed −45 V_CEO and −50 V_CBO ratings allow safe operation across wide negative rail swings without breakdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC327-40	Same TO-92 package; higher h_FE (250–630), lower V_CEO (−45 V same), but higher V_CE(sat) (−0.7 V max at −500 mA)	Better suited for higher-current switching; less optimal for low-noise linear amplification due to higher NF (10 dB max)	Select BC327-40 only when ≥500 mA I_C capability is required; BC307C remains preferred for <100 mA analog gain
PN2907A	TO-92; identical V_CEO (−60 V), wider h_FE range (100–300), higher PD (625 mW), but no guaranteed f_T or NF specs	More robust for power switching; lacks documented noise or bandwidth performance for precision analog use	Choose PN2907A for cost-sensitive general-purpose switching; retain BC307C where 280 MHz f_T and 2.0 dB NF are design-critical

Compared with BC327-40 and PN2907A, the BC307C offers the narrowest h_FE spread and best-documented noise/bandwidth performance in its class - making it the preferred choice for repeatable, low-noise analog amplification below 100 mA.

Availability

BC307C is available at Aetrix Electronics and suitable for audio preamplifiers, discrete bias generators, LED driver switches, and level translation interfaces requiring stable component supply and consistent h_FE binning.

Supply support for BC307C 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The BC307C belongs to onsemi's legacy small-signal transistor family designed for high-reliability, cost-effective discrete amplification and switching in consumer, industrial, and communications equipment.

FAQ

What is the guaranteed h_FE range for BC307C at −10 mA collector current?

The BC307C is binned to guarantee h_FE = 200–500 when tested at −10 mA_C and −5 V_CE. This tighter spread than BC307B (120–270) improves predictability in bias-critical analog circuits. The BC307C datasheet confirms this range in the "ON CHARACTERISTICS" table under h_FE test conditions.

Does BC307C support Pb-free soldering processes?

Yes, BC307C is offered in Pb-free TO-92 packaging (e.g., BC307CG), fully compliant with RoHS and qualified per onsemi's Pb-Free Soldering and Mounting Techniques Reference Manual. Standard reflow profiles for SnAgCu alloys apply, with peak temperatures up to 260°C.

What is the maximum power dissipation for BC307C at 70°C ambient temperature?

At 70°C ambient, BC307C's power dissipation must be derated from 350 mW at 25°C by 2.8 mW/°C. The allowable PD is 350 − (2.8 × (70 − 25)) = 224 mW. Exceeding this risks junction temperature exceeding +150°C, triggering thermal shutdown or degradation.

Can BC307C be used as a direct replacement for BC307B in existing designs?

BC307C can replace BC307B in most designs, but h_FE is higher (200–500 vs. 120–270), potentially increasing gain or bias current. Verify stability in feedback loops and check V_CE(sat) impact in switching applications. No PCB changes are needed - both share identical TO-92 pinout and footprint.

What is the typical noise figure of BC307C and under what conditions is it measured?

The BC307C has a typical noise figure of 2.0 dB, measured at IC = −0.2 mAdc, VCE = −5.0 Vdc, RS = 2.0 kΩ, and f = 1.0 kHz. This value is specified in the "ELECTRICAL CHARACTERISTICS" table and makes BC307C suitable for low-noise preamplifier stages where signal integrity is critical.

BC307C Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 420 @ 2mA, 5V

Power - Max:: 350 mW

Frequency - Transition:: 280MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

BC307C FAQ

1.How can I place an order for BC307C through Aetrix?

Please submit a Request for Quotation (RFQ) for BC307C 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 BC307C reliable?

The price and inventory of BC307C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC307C is usually 5 days.

3.What payment methods are accepted for BC307C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC307C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC307C?

BC307C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC307C 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 BC307C?

For technical support, including BC307C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC307C requirements.

6.How does Aetrix verify that BC307C is sourced from the original manufacturer or authorized distributors?

All BC307C 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 BC307C meets industry standards.

7.What is the process for return or replacement of BC307C?

All BC307C units undergo pre-shipment inspection (PSI). If there is an issue with BC307C, 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 BC307C part is unused and in its original packaging.

Return procedure for BC307C:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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