BC327-40 Equivalent & Substitute Parts

Part Overview

The BC327-40 is an active PNP bipolar junction transistor (BJT) manufactured by Diotec Semiconductor in TO-92 through-hole packaging. This device is rated for 45V collector-emitter breakdown voltage and 800mA maximum collector current, with a maximum power dissipation of 625mW. The BC327-40 serves in general-purpose switching and amplification applications requiring PNP transistor functionality in compact through-hole form factors. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications where the BC327-40 specifications are met or exceeded by alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	800	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Power - Max	625	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) Min @ Ic, Vce	250 @ 100mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	—
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-92-3 (TO-226AA)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitute parts for the BC327-40 are classified into two categories based on electrical parameter alignment:

Parametric Equivalent: BC32740TA (onsemi) matches the BC327-40 across all critical electrical specifications including 45V breakdown voltage, 800mA collector current, 625mW power rating, 100MHz transition frequency, and identical DC current gain characteristics. This part is a direct functional replacement with identical performance boundaries.

Functional Equivalent: PN2907ABU (onsemi) and KSA708YBU (Fairchild Semiconductor) provide PNP transistor functionality with specifications that meet or exceed the BC327-40 requirements. These parts operate within compatible electrical ranges but feature higher voltage ratings (60V) and alternative gain or frequency characteristics. Substitution is valid where the application does not require the exact parameter matching of the parametric equivalent.

Substitution eligibility is determined by the following criteria:

Transistor type must be PNP
Collector current rating must equal or exceed 800mA
Collector-emitter breakdown voltage must equal or exceed 45V
Power dissipation must equal or exceed 625mW
Package must be TO-92-3 through-hole configuration
Operating temperature range must encompass the application requirements

Parameter Comparison

Parameter	BC327-40 (Diotec)	BC32740TA (onsemi)	PN2907ABU (onsemi)	KSA708YBU (Fairchild)
Transistor Type	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	800 mA	800 mA	800 mA	700 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	60 V	60 V
Power - Max	625 mW	625 mW	625 mW	800 mW
Frequency - Transition	100 MHz	100 MHz	200 MHz	50 MHz
DC Current Gain (hFE) Min @ Ic, Vce	250 @ 100mA, 1V	250 @ 100mA, 1V	100 @ 150mA, 10V	120 @ 50mA, 2V
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	1.6V @ 50mA, 500mA	700mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100 nA	100 nA	20 nA	100 nA
Operating Temperature Range	-55 to 150 °C	Up to 150 °C	-55 to 150 °C	Up to 150 °C
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

BC32740TA (onsemi) is the primary parametric equivalent for direct replacement of the BC327-40. This part maintains identical electrical specifications across all critical parameters including voltage rating, current capacity, power dissipation, and gain characteristics. The BC32740TA carries ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. This part is supplied in Cut Tape packaging with 4,892 units in stock.

PN2907ABU (onsemi) is a functional equivalent suitable for applications where higher voltage margin (60V vs. 45V) and enhanced transition frequency (200MHz vs. 100MHz) provide design benefits. The PN2907ABU exhibits lower collector cutoff current (20nA vs. 100nA) and carries ROHS3 compliance with REACH Unaffected status. This part is available in bulk packaging with 155,400 units in stock, supporting high-volume requirements.

KSA708YBU (Fairchild Semiconductor) is a functional equivalent offering higher power dissipation (800mW vs. 625mW) and elevated voltage rating (60V). The KSA708YBU operates at lower transition frequency (50MHz) and exhibits different gain characteristics. This part is available in bulk packaging with 91,001 units in stock.

Selection between these substitutes depends on application-specific requirements for frequency response, gain characteristics, and voltage margin. All three parts maintain PNP transistor functionality and TO-92-3 through-hole compatibility with the BC327-40.

Frequently Asked Questions (FAQ)

Q: Can BC32740TA replace BC327-40 in all applications?

A: Yes. BC32740TA is a parametric equivalent with identical electrical specifications. All critical parameters including voltage rating, current capacity, power dissipation, transition frequency, and DC current gain match the BC327-40 exactly. The parts are functionally interchangeable.

Q: What is the difference between BC32740TA and PN2907ABU?

A: BC32740TA matches BC327-40 specifications exactly. PN2907ABU provides higher voltage rating (60V vs. 45V), higher transition frequency (200MHz vs. 100MHz), and lower collector cutoff current (20nA vs. 100nA). PN2907ABU is suitable where these enhanced characteristics provide design margin or performance benefits.

Q: Can KSA708YBU be used instead of BC327-40?

A: KSA708YBU is a functional equivalent with compatible PNP transistor operation and TO-92-3 packaging. However, it features lower maximum collector current (700mA vs. 800mA), lower transition frequency (50MHz vs. 100MHz), and different gain characteristics. Substitution is valid only where the application does not require the full 800mA current capacity or 100MHz frequency response of the BC327-40.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use TO-92-3 through-hole packaging, maintaining mechanical and electrical compatibility. BC32740TA is supplied in Cut Tape packaging; PN2907ABU and KSA708YBU are supplied in bulk packaging. Packaging format does not affect electrical performance or pin compatibility.

Q: What compliance certifications apply to these substitute parts?

A: BC32740TA and PN2907ABU carry ROHS3 compliance and REACH Unaffected status. KSA708YBU compliance information is provided with ECCN EAR99 classification. All parts meet EAR99 export control requirements.

Q: Which substitute part has the highest inventory availability?

A: PN2907ABU has the highest inventory with 155,400 units in stock. KSA708YBU has 91,001 units available. BC32740TA has 4,892 units in stock. BC327-40 has 1,360 units in stock.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. All substitute parts maintain identical TO-92-3 pin configuration and through-hole lead spacing. Direct PCB footprint compatibility is maintained across all parts without design modification.

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