Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi BC307ABU

Name: BC307ABU
Brand: onsemi
SKU: BC307ABU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BC307ABU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: BC307ABU.pdf

Description:: TRANS PNP 45V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,182

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BC307ABU from Fairchild Semiconductor is a PNP epitaxial silicon transistor optimized for low-noise amplifier and switching applications, with V_CEO = −45 V, I_C = −100 mA, h_FE = 180–460 (Class B), f_T = 130 MHz, and TO-92 package. It serves as an active gain element in audio preamplifier stages and signal-level switching in industrial control interfaces.

For engineers reviewing the BC307ABU datasheet, pinout, applications, or equivalent options, key selection criteria include its Class B h_FE range, low V_CE(sat) of −0.5 V at −10 mA/−0.5 mA, −5 V V_EB rating, and suitability for linear amplification below 100 kHz where noise figure < 4 dB is required.

Technical Context

The BC307ABU operates as a medium-speed, general-purpose PNP bipolar junction transistor with fixed-emitter bias topology. Its h_FE classification (B) ensures predictable DC current gain between 180 and 460 at V_CE = −5 V and I_C = −2 mA, while f_T = 130 MHz supports stable small-signal amplification up to mid-VHF range.

Designed for discrete analog signal conditioning, it features low output capacitance (C_ob = 6 pF at V_CB = −10 V) and input capacitance (C_ib = 12 pF at V_EB = −0.5 V), enabling high-impedance node interfacing without significant phase shift in feedback networks.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V: Maximum safe collector-emitter voltage before breakdown under open-base condition
I_C (DC)	−100 mA: Continuous collector current handling capacity for sustained switching or amplification
h_FE (Class B)	180–460: Confirmed DC current gain range ensuring consistent bias point stability in amplifier designs
f_T	130 MHz: Unity-gain frequency defining usable bandwidth for small-signal AC amplification
V_CE(sat)	−0.5 V @ −10 mA/−0.5 mA: Low saturation voltage enabling efficient switching with minimal power loss
NF	< 4 dB @ 1 kHz: Verified noise figure supporting low-noise preamplifier use in sensor front-ends
P_C	500 mW: Maximum dissipated power in TO-92 package with adequate heatsinking

Pinout & Package

BC307ABU is housed in a standard TO-92 plastic package with 3 leads, lead spacing 1.27 mm, body length 4.58 mm, and maximum height 3.86 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal for PNP operation	Connected to most positive rail in common-emitter configuration; sets reference for base bias
2 (Base)	Control electrode for minority-carrier injection	Receives reverse-biased current to modulate collector current; requires current-limiting resistor
3 (Collector)	Current sink terminal	Connected to load or next stage; voltage swing limited by V_CEO = −45 V rating

Key Features

Feature	Design Value
Low-noise amplification	Verified NF < 4 dB at 1 kHz enables use in microphone preamps and precision sensor interfaces
Class B h_FE binning	Guaranteed 180–460 gain range reduces need for circuit trimming in production amplifiers
High f_T / low C_ob ratio	130 MHz f_T with only 6 pF output capacitance supports stable gain above 10 MHz
TO-92 mechanical compatibility	Standard footprint allows drop-in replacement for BC327, BC557, and other legacy PNP transistors
Robust thermal rating	150°C max junction temperature supports operation in enclosed industrial enclosures without forced cooling

Applications

Audio Pre-amplifier Stage	Industrial Level Shifter
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: Discrete PNP transistor configured in common-emitter mode for voltage gain and impedance transformation. Use Value: Low 4 dB noise figure and stable h_FE ensure SNR preservation across production batches without calibration.	Use Scenario: Converting logic-level signals from 3.3 V microcontrollers to −12 V control lines in relay driver circuits. IC Role / Device Role / Timing Role: Saturated-switch PNP transistor acting as active pull-up to negative rail. Use Value: V_CE(sat) ≤ −0.5 V at −10 mA minimizes voltage drop and power loss during steady-state conduction.
Linear Voltage Regulator Pass Element	Discrete Op-Amp Input Stage
Use Scenario: Serving as series pass transistor in adjustable negative LDOs requiring < 100 mA output. IC Role / Device Role / Timing Role: Emitter-follower configured PNP device regulating output voltage via base voltage control. Use Value: 500 mW power dissipation and −45 V V_CEO support regulation down to −30 V with margin.	Use Scenario: Forming differential pair input stage in discrete instrumentation amplifiers for medical sensors. IC Role / Device Role / Timing Role: Matched PNP pair providing high CMRR and low input offset drift. Use Value: Tight h_FE binning (Class B) and low C_ib = 12 pF reduce gain mismatch and capacitive imbalance.

Audio Pre-amplifier Stage

Industrial Level Shifter

Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling.

IC Role / Device Role / Timing Role: Discrete PNP transistor configured in common-emitter mode for voltage gain and impedance transformation.

Use Value: Low 4 dB noise figure and stable h_FE ensure SNR preservation across production batches without calibration.

Use Scenario: Converting logic-level signals from 3.3 V microcontrollers to −12 V control lines in relay driver circuits.

IC Role / Device Role / Timing Role: Saturated-switch PNP transistor acting as active pull-up to negative rail.

Use Value: V_CE(sat) ≤ −0.5 V at −10 mA minimizes voltage drop and power loss during steady-state conduction.

Linear Voltage Regulator Pass Element

Discrete Op-Amp Input Stage

Use Scenario: Serving as series pass transistor in adjustable negative LDOs requiring < 100 mA output.

IC Role / Device Role / Timing Role: Emitter-follower configured PNP device regulating output voltage via base voltage control.

Use Value: 500 mW power dissipation and −45 V V_CEO support regulation down to −30 V with margin.

Use Scenario: Forming differential pair input stage in discrete instrumentation amplifiers for medical sensors.

IC Role / Device Role / Timing Role: Matched PNP pair providing high CMRR and low input offset drift.

Use Value: Tight h_FE binning (Class B) and low C_ib = 12 pF reduce gain mismatch and capacitive imbalance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC557B	Same TO-92 package; h_FE = 200–450; V_CEO = −45 V; f_T = 100 MHz	Slightly lower bandwidth; identical noise performance and saturation behavior	Preferred when board layout rework is prohibited and f_T margin > 30 MHz is not required
BC327-40	TO-92; h_FE = 250–630; V_CEO = −45 V; P_C = 625 mW	Higher gain spread and power rating; no guaranteed NF spec	Chosen when higher current drive (>100 mA) or wider h_FE tolerance is acceptable

Compared with BC557B and BC327-40, the BC307ABU offers tighter h_FE binning and verified low-noise performance critical for precision analog front-ends, while maintaining full TO-92 mechanical interchangeability and identical voltage ratings.

Availability

BC307ABU is available at Aetrix Electronics and suitable for audio preamplifier design, industrial level-shifting circuits, and discrete linear voltage regulator implementations requiring stable component supply and long-term obsolescence management.

Supply support for BC307ABU 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 power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The BC307ABU belongs to Fairchild's legacy BC307/308/309 family of general-purpose PNP transistors engineered for cost-sensitive, high-reliability analog signal conditioning and switching in industrial and consumer equipment.

FAQ

What is the exact h_FE range specified for BC307ABU?

The BC307ABU is binned to Class B, with a guaranteed DC current gain (h_FE) of 180 to 460 when measured at V_CE = −5 V and I_C = −2 mA. This range is explicitly defined in the Fairchild BC307/308/309 datasheet Rev. A2 and distinguishes BC307ABU from BC307A (Class A: 120–220) and BC307C (Class C: 380–800).

Does BC307ABU have a specified noise figure, and under what conditions?

Yes, BC307ABU has a verified noise figure (NF) of less than 4 dB, measured at V_CE = −5 V, I_C = −0.2 mA, R_G = 2 kΩ, and f = 1 kHz. This value is documented in the "Electrical Characteristics" table of the official Fairchild datasheet and applies specifically to the BC307 and BC308 variants - confirming BC307ABU's suitability for low-noise amplifier stages.

What is the maximum collector-emitter voltage rating for BC307ABU?

The BC307ABU has a maximum collector-emitter voltage rating (V_CEO) of −45 V under open-base conditions at T_a = 25°C. This rating is confirmed in both the Absolute Maximum Ratings and Electrical Characteristics sections of the Fairchild BC307/308/309 datasheet and must not be exceeded to avoid avalanche breakdown.

Is BC307ABU pin-compatible with BC557 or BC327 series transistors?

Yes, BC307ABU uses the standard TO-92 package with identical pinout (Emitter-Base-Collector on leads 1-2-3), making it mechanically and electrically pin-compatible with BC557, BC327, and other industry-standard PNP transistors in the same outline. No PCB layout changes are required for direct substitution in non-critical gain or bandwidth applications.

What is the typical transition frequency (f_T) of BC307ABU, and how is it tested?

The typical transition frequency (f_T) of BC307ABU is 130 MHz, measured under conditions of V_CE = −5 V, I_C = −10 mA, and f = 50 MHz, as stated in the Fairchild BC307/308/309 datasheet. This parameter reflects the frequency at which the transistor's small-signal current gain drops to unity and defines its upper usable bandwidth in amplifier designs.

BC307ABU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

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:: 500mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 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

BC307ABU FAQ

1.How can I place an order for BC307ABU through Aetrix?

Please submit a Request for Quotation (RFQ) for BC307ABU 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 BC307ABU reliable?

The price and inventory of BC307ABU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC307ABU is usually 5 days.

3.What payment methods are accepted for BC307ABU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC307ABU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC307ABU?

BC307ABU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC307ABU 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 BC307ABU?

For technical support, including BC307ABU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC307ABU requirements.

6.How does Aetrix verify that BC307ABU is sourced from the original manufacturer or authorized distributors?

All BC307ABU 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 BC307ABU meets industry standards.

7.What is the process for return or replacement of BC307ABU?

All BC307ABU units undergo pre-shipment inspection (PSI). If there is an issue with BC307ABU, 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 BC307ABU part is unused and in its original packaging.

Return procedure for BC307ABU:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…