BC327-040 Equivalent & Substitute Parts

Part Overview

The BC327-040 is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 800 mA maximum collector current in a Through Hole TO-92 package. The device is designed for general-purpose switching and amplification applications requiring moderate current handling and voltage ratings.

Due to its obsolete product status, direct replacement with active production equivalents is necessary for new designs and ongoing procurement. The substitute parts listed maintain functional compatibility through equivalent electrical ratings and identical package configurations.

Key Parameters

Parameter	BC327-040
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	45 V
Current - Collector (Ic) (Max)	800 mA
Power - Max	625 mW
Frequency - Transition	260 MHz
Operating Temperature Range	-55°C to 150°C (TJ)
Package / Case	TO-226-3, TO-92-3 Long Body
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the BC327-040 is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (required match)
Package Configuration: TO-92-3 Through Hole (required match)
Voltage - Collector Emitter Breakdown: minimum 45 V
Current - Collector (Ic) (Max): minimum 800 mA
Power Dissipation: minimum 625 mW
Operating Temperature Range: -55°C to 150°C minimum

Secondary Compatibility Factors:

DC Current Gain (hFE) characteristics
Vce Saturation voltage
Frequency - Transition specifications

Substitute parts are grouped into two categories based on their alignment with the BC327-040 electrical specifications and product status.

Parameter Comparison

Parameter	BC327-040	BC32740BU	BC32725BU	2N4403BU	2N3906BU
Manufacturer	onsemi	onsemi	onsemi	Fairchild Semiconductor	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	40 V	40 V
Current - Collector (Ic) (Max)	800 mA	800 mA	800 mA	600 mA	200 mA
Power - Max	625 mW	625 mW	625 mW	625 mW	625 mW
Frequency - Transition	260 MHz	100 MHz	100 MHz	200 MHz	250 MHz
Operating Temperature Range	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	750mV @ 50mA, 500mA	400mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 100mA, 1V	250 @ 100mA, 1V	160 @ 100mA, 1V	100 @ 150mA, 2V	100 @ 10mA, 1V
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified

Engineering Selection Recommendations

Tier 1 - Direct Electrical Equivalents (Preferred):

BC32740BU and BC32725BU are the primary substitutes for BC327-040. Both devices are manufactured by onsemi, maintain identical voltage and current ratings (45 V, 800 mA), and are packaged in TO-92-3 Through Hole configuration. Both parts are in active production status, ensuring long-term availability. BC32740BU provides the closest DC Current Gain match (250 @ 100mA, 1V) to the original BC327-040. BC32725BU offers reduced transition frequency (100 MHz versus 260 MHz) but maintains all critical electrical parameters. Both substitute parts are ROHS3 compliant, addressing environmental compliance requirements absent in the obsolete original part.

Tier 2 - Functional Alternatives (Limited Current Applications):

2N4403BU (Fairchild Semiconductor) operates at reduced voltage rating (40 V versus 45 V) and reduced collector current (600 mA versus 800 mA). This part is suitable for applications where the full 800 mA current capability is not required. The device maintains 625 mW power dissipation and operates across the same temperature range.

2N3906BU (Fairchild Semiconductor) is limited to 200 mA maximum collector current and 40 V voltage rating. This part is suitable only for low-current applications and does not provide functional equivalence for circuits requiring the full 800 mA capability of the BC327-040.

Compliance Considerations:

BC32740BU and BC32725BU are ROHS3 compliant, addressing regulatory requirements for new designs. The original BC327-040 is RoHS non-compliant. Fairchild Semiconductor substitute parts do not specify RoHS status in the provided data.

Frequently Asked Questions (FAQ)

Q: Can BC32740BU directly replace BC327-040 in existing designs?

A: Yes. BC32740BU maintains identical voltage (45 V), current (800 mA), power (625 mW), and package (TO-92-3) specifications. The DC Current Gain (hFE) is identical at 250 @ 100mA, 1V. The reduced transition frequency (100 MHz versus 260 MHz) does not affect applications operating below this frequency threshold. Pin configuration and mechanical dimensions are identical.

Q: What is the difference between BC32740BU and BC32725BU?

A: Both parts share identical voltage, current, and power ratings. The primary difference is DC Current Gain: BC32740BU provides 250 @ 100mA, 1V (matching BC327-040), while BC32725BU provides 160 @ 100mA, 1V. Both operate at 100 MHz transition frequency. Selection depends on circuit gain requirements.

Q: Can 2N4403BU replace BC327-040 in all applications?

A: No. 2N4403BU is limited to 600 mA maximum collector current versus 800 mA for BC327-040. It is suitable only for applications requiring 600 mA or less. The voltage rating is also reduced to 40 V. Use this part only when circuit requirements do not exceed these reduced specifications.

Q: Why is 2N3906BU listed as a substitute if it only handles 200 mA?

A: 2N3906BU is listed as a substitute for low-current applications only. It is not suitable for circuits requiring the full 800 mA capability of BC327-040. Selection of this part requires verification that application current requirements do not exceed 200 mA.

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

A: Yes. All substitute parts are packaged in TO-92-3 Through Hole configuration, identical to BC327-040. Mechanical dimensions and pin assignments are compatible for direct board-level substitution.

Q: What is the impact of reduced transition frequency in BC32740BU and BC32725BU?

A: Both parts operate at 100 MHz transition frequency versus 260 MHz for BC327-040. This reduction does not affect DC switching applications or low-frequency amplification circuits. Applications requiring operation above 100 MHz require evaluation of specific frequency requirements against substitute part specifications.

Q: Are the substitute parts RoHS compliant?

A: BC32740BU and BC32725BU are ROHS3 compliant. Fairchild Semiconductor parts (2N4403BU and 2N3906BU) do not specify RoHS status in available documentation. For new designs subject to RoHS requirements, onsemi substitutes are recommended.

Q: What is the temperature operating range for substitute parts?

A: All substitute parts operate across -55°C to 150°C (TJ), matching the BC327-040 specification. This range is suitable for industrial and consumer applications with standard thermal requirements.

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