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

onsemi BC327-040

Name: BC327-040
Brand: onsemi
SKU: BC327-040
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC327-040

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC327-040.pdf

Description:: TRANS PNP 45V 0.8A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:5,150

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Product details

Overview

BC327-040 from onsemi is a PNP silicon bipolar junction transistor designed for general-purpose amplification and switching in low-voltage, medium-current circuits. It features V_CEO = −45 V, I_C = −800 mA, h_FE = 250–630 (at I_C = −100 mA), V_CE(sat) = −0.7 V (at I_C = −500 mA, I_B = −50 mA), and f_T = 260 MHz - enabling use in audio preamplifiers, relay drivers, and logic-level interface stages.

For engineers reviewing the BC327-040 datasheet, pinout, applications, or equivalent options, key selection considerations include its guaranteed h_FE ≥ 250 (min) at I_C = −100 mA, TO-92 package thermal resistance (R_JA = 200 °C/W), and −55 °C to +150 °C operating junction temperature range.

Technical Context

The BC327-040 operates as a discrete PNP BJT with fixed gain binning (h_FE min = 250), optimized for linear amplification and saturated switching. Its V_CE(sat) ≤ −0.7 V at I_C/I_B = 10 ensures low conduction loss in driver applications, while f_T = 260 MHz supports audio-frequency signal handling without phase distortion.

Thermal design relies on R_JC = 83.3 °C/W and R_JA = 200 °C/W under free-air conditions. The device's safe operating area (SOA) is defined up to 100 ms pulse width with second-breakdown limits, and it meets Pb-free RoHS compliance per ON Semiconductor's standard packaging.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V - Maximum collector-emitter voltage before breakdown; sets upper rail limit in negative-supply amplifier or switch stages.
I_C (max)	−800 mA - Continuous collector current rating; supports relay coils, LED arrays, and small solenoids without heatsinking.
h_FE (min)	250 @ I_C = −100 mA - Guaranteed DC current gain ensures predictable base drive sizing in linear and switching designs.
V_CE(sat)	−0.7 V @ I_C = −500 mA, I_B = −50 mA - Low saturation voltage minimizes power dissipation and heat generation in on-state operation.
f_T	260 MHz - Transition frequency confirms suitability for audio-band amplification and fast-switching digital interfaces.
R_JA	200 °C/W - Junction-to-ambient thermal resistance defines maximum power derating (5.0 mW/°C above 25°C) in PCB-mounted TO-92 layout.

Pinout & Package

BC327-040 is housed in a standard TO-92 plastic package (Case 29, Style 17), with leads formed for through-hole mounting and marked "327" on the body. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - verified per ON Semiconductor's official marking diagram and package dimensions drawing (CASE 29-11).

Pin/Terminal	Circuit Role	Design Meaning
1	Collector	Primary current sink terminal; connects to load or supply rail in common-emitter configurations.
2	Base	Control input; requires current-limited drive (e.g., via series resistor) to bias transistor into active or saturation region.
3	Emitter	Current source terminal; typically tied to ground or negative rail, establishing reference for V_BE and I_C control.

Key Features

Feature	Design Value
Pb-Free TO-92 package	Complies with RoHS Directive 2011/65/EU; compatible with lead-free reflow and wave soldering processes.
Guaranteed h_FE ≥ 250	Enables consistent base-resistor calculation across production lots without gain binning adjustments.
V_CE(sat) ≤ −0.7 V	Reduces power loss in saturated switching, improving efficiency in discrete load-driver circuits.
−55 °C to +150 °C T_J	Supports operation in industrial ambient environments and automotive under-hood locations with minimal derating.

Applications

Audio Preamp Stage	Relay Driver Circuit
Use Scenario: Amplifying low-level microphone or line-level signals in battery-powered portable audio devices. IC Role / Device Role / Timing Role: Discrete PNP BJT configured in common-emitter topology for voltage gain and impedance matching. Use Value: h_FE ≥ 250 and f_T = 260 MHz ensure stable mid-band gain (20 Hz–20 kHz) with low harmonic distortion and no high-frequency roll-off.	Use Scenario: Driving 12 V, 200 mA electromagnetic relays in PLC I/O modules and industrial control panels. IC Role / Device Role / Timing Role: Saturated switch controlling relay coil current with fast turn-on/turn-off response. Use Value: V_CE(sat) ≤ −0.7 V limits coil power loss to <150 mW, reducing thermal stress and enabling compact PCB layout without heatsink.
Logic-Level Interface	Current Mirror Reference
Use Scenario: Translating 3.3 V CMOS logic outputs to −5 V or −12 V control signals in mixed-supply systems. IC Role / Device Role / Timing Role: Level-shifting switch with emitter-follower or common-base configuration for bidirectional compatibility. Use Value: V_EBO = −5.0 V and I_CBO ≤ −100 nA prevent leakage-induced false triggering and support reliable DC-coupled translation.	Use Scenario: Building matched current sources in analog sensor conditioning circuits and precision bias networks. IC Role / Device Role / Timing Role: Active component in two-transistor current mirror topology with matched h_FE and thermal tracking. Use Value: Tight h_FE binning (250–630) and −55 °C to +150 °C T_J range enable stable current ratio over temperature and supply variation.

Audio Preamp Stage

Relay Driver Circuit

Use Scenario: Amplifying low-level microphone or line-level signals in battery-powered portable audio devices.

IC Role / Device Role / Timing Role: Discrete PNP BJT configured in common-emitter topology for voltage gain and impedance matching.

Use Value: h_FE ≥ 250 and f_T = 260 MHz ensure stable mid-band gain (20 Hz–20 kHz) with low harmonic distortion and no high-frequency roll-off.

Use Scenario: Driving 12 V, 200 mA electromagnetic relays in PLC I/O modules and industrial control panels.

IC Role / Device Role / Timing Role: Saturated switch controlling relay coil current with fast turn-on/turn-off response.

Use Value: V_CE(sat) ≤ −0.7 V limits coil power loss to <150 mW, reducing thermal stress and enabling compact PCB layout without heatsink.

Logic-Level Interface

Current Mirror Reference

Use Scenario: Translating 3.3 V CMOS logic outputs to −5 V or −12 V control signals in mixed-supply systems.

IC Role / Device Role / Timing Role: Level-shifting switch with emitter-follower or common-base configuration for bidirectional compatibility.

Use Value: V_EBO = −5.0 V and I_CBO ≤ −100 nA prevent leakage-induced false triggering and support reliable DC-coupled translation.

Use Scenario: Building matched current sources in analog sensor conditioning circuits and precision bias networks.

IC Role / Device Role / Timing Role: Active component in two-transistor current mirror topology with matched h_FE and thermal tracking.

Use Value: Tight h_FE binning (250–630) and −55 °C to +150 °C T_J range enable stable current ratio over temperature and supply variation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP BJT amplification and switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC327-25	Lower h_FE bin: min = 160 @ I_C = −100 mA; otherwise identical ratings and package.	Suitable where lower gain suffices and tighter base-drive tolerance is acceptable.	Select BC327-25 when circuit gain margin allows reduced h_FE and cost optimization is prioritized.
BC807-40	SMT version (SOT-23); same h_FE bin (250–630), but lower I_C = −500 mA and higher R_JA = 300 °C/W.	Used in space-constrained PCBs requiring surface-mount assembly instead of through-hole.	Choose BC807-40 only for automated SMT production; verify SOA and thermal performance under actual board layout.

Compared with BC327-25 and BC807-40, the BC327-040 delivers the highest guaranteed h_FE in the BC327 family while retaining TO-92 through-hole compatibility and full 800 mA current capability - making it optimal for legacy designs, prototyping, and applications demanding robust gain stability without SMT rework.

Availability

BC327-040 is available at Aetrix Electronics and suitable for audio preamplifiers, relay driver circuits, and logic-level interface modules requiring stable component supply, long-term manufacturability, and industry-standard through-hole packaging.

Supply support for BC327-040 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BC327-040 belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability and consistency in discrete amplification, switching, and interface functions across commercial and industrial temperature ranges.

FAQ

What is the minimum DC current gain (h_FE) of the BC327-040?

The BC327-040 has a guaranteed minimum h_FE of 250 when tested at I_C = −100 mA and V_CE = −1.0 V. This value is binned during manufacturing and confirmed per ON Semiconductor's BC327/D datasheet Rev. 3. The BC327-040's h_FE can reach up to 630 under the same conditions, supporting robust base-drive design across production lots.

Is the BC327-040 available in Pb-free packaging?

Yes, the BC327-040G variant is the Pb-free, RoHS-compliant version of the BC327-040, using the same TO-92 package and electrical specifications. Both BC327-040 and BC327-040G share identical maximum ratings, thermal characteristics, and gain binning - differing only in lead finish and compliance documentation.

Can the BC327-040 replace the BC327-16 in an existing design?

The BC327-040 can replace the BC327-16 in most cases, but only if the circuit requires higher minimum h_FE. The BC327-16 guarantees h_FE ≥ 100, while the BC327-040 guarantees h_FE ≥ 250. No changes to pinout, package, or voltage/current ratings are needed - however, verify base resistor values to avoid overdriving the higher-gain BC327-040.

What is the maximum power dissipation of the BC327-040 at 25°C ambient?

At T_A = 25°C, the BC327-040 has a total power dissipation rating of 625 mW in free-air conditions. This value derates linearly by 5.0 mW/°C above 25°C ambient, meaning usable power drops to 500 mW at 50°C ambient. Derating must be applied when calculating safe operating area in real-world thermal environments.

Does the BC327-040 support operation at elevated temperatures?

Yes, the BC327-040 is rated for junction temperatures from −55 °C to +150 °C. Its thermal resistance values (R_JC = 83.3 °C/W, R_JA = 200 °C/W) allow reliable operation in industrial enclosures and automotive under-dash locations, provided PCB copper area and airflow meet datasheet-recommended layout guidelines for TO-92 packages.

BC327-040 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):: 800 mA

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

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 100mA, 1V

Power - Max:: 625 mW

Frequency - Transition:: 260MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

BC327-040 FAQ

1.How can I place an order for BC327-040 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC327-040 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 BC327-040 reliable?

The price and inventory of BC327-040 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC327-040 is usually 5 days.

3.What payment methods are accepted for BC327-040?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC327-040 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC327-040?

BC327-040 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC327-040 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 BC327-040?

For technical support, including BC327-040 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC327-040 requirements.

6.How does Aetrix verify that BC327-040 is sourced from the original manufacturer or authorized distributors?

All BC327-040 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 BC327-040 meets industry standards.

7.What is the process for return or replacement of BC327-040?

All BC327-040 units undergo pre-shipment inspection (PSI). If there is an issue with BC327-040, 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 BC327-040 part is unused and in its original packaging.

Return procedure for BC327-040:

1.Submit a request within 90 days.

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

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