BC337-25,112 Equivalent & Substitute Parts

Part Overview

The BC337-25,112 is an NPN bipolar junction transistor manufactured by NXP USA Inc., housed in a TO-92-3 through-hole package. This device is rated for 45 V collector-emitter breakdown voltage, 500 mA maximum collector current, and 625 mW power dissipation. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	625	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	160 @ 100mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	—
Operating Temperature (Max)	150	°C
Package / Case	TO-92-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the BC337-25,112 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Transistor Type: NPN (must match exactly)
Voltage - Collector Emitter Breakdown (Max): 45 V or greater
Current - Collector (Ic) (Max): 500 mA or greater
Power - Max: 625 mW or greater
Package / Case: TO-92-3 (through-hole form factor)
Vce Saturation (Max) @ Ib, Ic: 700mV @ 50mA, 500mA (must not exceed)
DC Current Gain (hFE) (Min) @ Ic, Vce: 160 @ 100mA, 1V (must meet or exceed)

The substitute parts listed below satisfy these electrical and mechanical requirements within the allowed parameter ranges.

Parameter Comparison

Parameter	BC337-25,112 (Main)	BC337-25-AP	BC33725BU	2N4401BU
Manufacturer	NXP USA Inc.	Micro Commercial Co	Fairchild Semiconductor	onsemi
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	40 V
Current - Collector (Ic) (Max)	500 mA	800 mA	800 mA	600 mA
Power - Max	625 mW	625 mW	625 mW	625 mW
Frequency - Transition	100 MHz	210 MHz	100 MHz	250 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	160 @ 100mA, 1V	160 @ 100mA, 1V	160 @ 100mA, 1V	100 @ 150mA, 1V
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	750mV @ 50mA, 500mA
Operating Temperature (Max)	150°C	150°C	150°C	150°C
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BC337-25-AP (Micro Commercial Co): This part is electrically equivalent to the BC337-25,112, with identical voltage rating (45 V), higher collector current capability (800 mA), and matching DC current gain specifications. Both parts are obsolete. BC337-25-AP is ROHS3 compliant and carries unlimited moisture sensitivity rating. This part is suitable for direct substitution in applications where the higher current rating does not create thermal or design constraints.

BC33725BU (Fairchild Semiconductor): This part meets all critical electrical parameters with 45 V voltage rating, 800 mA collector current, and matching DC current gain (160 @ 100mA, 1V). BC33725BU is active in production status, providing long-term availability and supply chain stability. It is ROHS3 compliant and available in bulk packaging. This part is the preferred choice for new designs and ongoing production requiring sustained component availability.

2N4401BU (onsemi): This part has a lower voltage rating (40 V) compared to the BC337-25,112 (45 V). While it exceeds the collector current requirement (600 mA vs. 500 mA) and has higher transition frequency (250 MHz), the reduced voltage rating limits its use to applications where the 40 V maximum is sufficient. The DC current gain specification differs (100 @ 150mA, 1V vs. 160 @ 100mA, 1V). 2N4401BU is active in production and ROHS3 compliant. This part is suitable only for applications with voltage requirements of 40 V or less.

Frequently Asked Questions (FAQ)

Q: Can BC337-25-AP be used as a direct replacement for BC337-25,112?

A: Yes. BC337-25-AP meets all critical electrical parameters: 45 V voltage rating, 500 mA minimum collector current capability (rated at 800 mA), matching DC current gain (160 @ 100mA, 1V), and identical TO-92-3 package. Both parts are obsolete, but BC337-25-AP provides equivalent performance.

Q: Why is BC33725BU recommended over BC337-25-AP?

A: BC33725BU is the preferred substitute because it is active in production status, ensuring long-term availability and supply chain continuity. BC337-25-AP is obsolete. Both parts are electrically equivalent, but BC33725BU provides superior procurement reliability for ongoing applications.

Q: Can 2N4401BU replace BC337-25,112 in all applications?

A: No. 2N4401BU has a maximum voltage rating of 40 V, compared to 45 V for BC337-25,112. It is suitable only for applications where the circuit operates at 40 V or below. Additionally, the DC current gain specification differs (100 @ 150mA, 1V vs. 160 @ 100mA, 1V). Verify circuit voltage requirements before substitution.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts (BC337-25-AP, BC33725BU, and 2N4401BU) use the TO-92-3 through-hole package, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the BC337-25,112. All parts carry EAR99 export classification and HTSUS code 8541.21.0075.

Q: Which substitute part has the best long-term availability?

A: BC33725BU (Fairchild Semiconductor) is the only active production part among the substitutes. It is the recommended choice for new designs and applications requiring sustained component availability beyond the obsolescence of BC337-25,112.

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