BC337-40,412 NPN Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The BC337-40,412 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, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and current availability.

Key Parameters

Parameter	BC337-40,412	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
Operating Temperature (Max)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	V
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 100mA, 1V	—

Substitute Part Grouping Explanation

Substitution of the BC337-40,412 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (mandatory match)
Package / Case: TO-92-3 through-hole (mandatory match)
Voltage - Collector Emitter Breakdown (Max): ≥ 45 V
Current - Collector (Ic) (Max): ≥ 500 mA
Power - Max: ≥ 625 mW
Operating Temperature (Max): ≥ 150°C

Secondary Compatibility Parameters:

Vce Saturation characteristics
DC Current Gain (hFE) range
Frequency - Transition capability

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria) and Functional Alternatives (meeting primary criteria with different secondary characteristics). All listed substitutes maintain RoHS3 compliance and REACH unaffected status where applicable.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	Frequency MHz	Temp °C	hFE @ Ic, Vce	Status
BC337-40,412	NXP USA Inc.	500	45	625	100	150	250 @ 100mA, 1V	Obsolete
BC33740BU	onsemi	800	45	625	100	150	250 @ 100mA, 1V	Active
BC33716BU	Fairchild Semiconductor	800	45	625	100	150	100 @ 100mA, 1V	Active
BC33725BU	Fairchild Semiconductor	800	45	625	100	150	160 @ 100mA, 1V	Active
PN2222ABU	onsemi	1000	40	625	300	150	100 @ 150mA, 10V	Active
2N4401BU	onsemi	600	40	625	250	150	100 @ 150mA, 1V	Active
2N3904BU	onsemi	200	40	625	300	150	100 @ 10mA, 1V	Active
BC547B	Diotec Semiconductor	100	45	500	300	150	200 @ 2mA, 5V	Active
BC550CBU	onsemi	100	45	500	300	150	420 @ 2mA, 5V	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

BC33740BU (onsemi) and BC33716BU (Fairchild Semiconductor) are the closest functional equivalents. Both devices match the 45 V breakdown voltage, 625 mW power rating, and 150°C maximum operating temperature of the BC337-40,412. BC33740BU provides identical hFE characteristics (250 @ 100mA, 1V) and exceeds the 500 mA collector current requirement with 800 mA capability. BC33716BU offers 800 mA collector current with lower hFE (100 @ 100mA, 1V). Both are active products with full RoHS3 compliance and REACH unaffected status.

BC33725BU (Fairchild Semiconductor) provides equivalent electrical performance with 800 mA collector current and intermediate hFE (160 @ 100mA, 1V). All three BC337 variants maintain identical frequency response (100 MHz) and thermal characteristics.

Secondary Substitutes (Application-Dependent):

PN2222ABU (onsemi) exceeds all primary electrical criteria with 1 A collector current and 300 MHz transition frequency. However, the 40 V breakdown voltage is 5 V lower than the original specification. This device is suitable for applications where the 45 V rating is not critical to circuit operation.

2N4401BU (onsemi) provides 600 mA collector current and 250 MHz frequency response with 40 V breakdown voltage. This part is appropriate for designs tolerating reduced voltage headroom.

Low-Current Alternatives:

2N3904BU, BC547B, and BC550CBU are suitable only for applications requiring collector currents below 200 mA. These devices do not meet the 500 mA minimum current requirement of the original specification and should be selected only when circuit design permits reduced current handling.

All recommended substitutes maintain through-hole TO-92-3 packaging, ensuring mechanical compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can BC33740BU directly replace BC337-40,412 in all applications?

A: BC33740BU meets or exceeds all primary electrical parameters of BC337-40,412: 45 V breakdown voltage, 625 mW power rating, 150°C maximum temperature, and 800 mA collector current (exceeding the 500 mA requirement). Identical hFE characteristics (250 @ 100mA, 1V) and matching 100 MHz transition frequency ensure functional equivalence. Direct substitution is appropriate for applications where the original 500 mA specification is the design requirement.

Q: What is the difference between BC33740BU and BC33716BU?

A: Both devices share identical electrical ratings: 45 V breakdown voltage, 800 mA collector current, 625 mW power dissipation, and 100 MHz transition frequency. The primary difference is DC current gain: BC33740BU specifies 250 @ 100mA, 1V, while BC33716BU specifies 100 @ 100mA, 1V. Selection depends on circuit bias requirements. Higher hFE (BC33740BU) reduces base drive requirements; lower hFE (BC33716BU) provides more conservative gain characteristics.

Q: Why is PN2222ABU listed as a substitute if it has only 40 V breakdown voltage?

A: PN2222ABU exceeds the original 500 mA collector current requirement with 1 A capability and provides superior 300 MHz transition frequency. The 40 V breakdown voltage is 5 V lower than the 45 V specification. This device is a functional substitute only for applications where the circuit operating voltage does not approach the 40 V limit. Circuit analysis must confirm that the reduced voltage margin does not compromise design safety or reliability.

Q: Are BC547B and BC550CBU suitable replacements?

A: BC547B and BC550CBU are not suitable direct replacements. Both devices are limited to 100 mA maximum collector current, which is insufficient for applications requiring the original 500 mA specification. These parts are appropriate only for low-current signal amplification circuits where collector current does not exceed 100 mA. Substitution requires circuit redesign.

Q: What packaging considerations apply to these substitutes?

A: All listed substitute parts maintain TO-92-3 through-hole packaging, ensuring mechanical compatibility with PCB layouts designed for BC337-40,412. No package adapter or layout modification is required. Verify lead spacing and formed-lead configuration match existing PCB hole patterns.

Q: Do all substitutes maintain RoHS3 compliance?

A: BC33740BU, BC33716BU, BC33725BU, PN2222ABU, 2N4401BU, 2N3904BU, and BC550CBU are confirmed RoHS3 compliant. BC547B RoHS status is not applicable per manufacturer data. Verify compliance requirements for your specific application before final part selection.

Q: What is the significance of hFE variation among substitutes?

A: DC current gain (hFE) determines the base current required to achieve specified collector current. Higher hFE (BC550CBU: 420 @ 2mA, 5V) requires less base drive; lower hFE (BC33716BU: 100 @ 100mA, 1V) requires more base current. Circuit bias networks must be evaluated to ensure adequate base drive for the selected substitute. Significant hFE differences may require resistor value adjustments in base bias circuits.

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