BC337-40 A1G Equivalent & Substitute Parts

Part Overview

The BC337-40 A1G is an NPN bipolar junction transistor manufactured by Taiwan Semiconductor Corporation, designed for general-purpose switching and amplification applications. This component operates at a maximum collector current of 800 mA with a collector-emitter breakdown voltage of 45 V and maximum power dissipation of 625 mW. The device is packaged in a TO-92 through-hole configuration with formed leads.

The BC337-40 A1G is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this transistor specification.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	800	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	700 mV @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	250 @ 100 mA, 5 V	—
Power - Max	625	mW
Frequency - Transition	100	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the BC337-40 A1G is determined by strict electrical and mechanical parameter matching. The following criteria establish valid equivalency:

Primary Matching Criteria:

Transistor Type: NPN
Current - Collector (Ic) Max: 800 mA
Voltage - Collector Emitter Breakdown (Max): 45 V
Power - Max: 625 mW
Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226AA) Formed Leads

Secondary Matching Criteria:

Vce Saturation (Max) @ Ib, Ic: 700 mV @ 50 mA, 500 mA
Current - Collector Cutoff (Max): 100 nA
Frequency - Transition: 100 MHz

Substitute parts are classified into two categories:

Direct Substitutes: Parts meeting all primary and secondary matching criteria with identical electrical performance specifications.

Similar Substitutes: Parts meeting all primary matching criteria with variations in secondary parameters such as DC current gain, frequency response, or operating temperature range. These parts are electrically compatible but may exhibit different performance characteristics in specific applications.

Parameter Comparison

Parameter	BC337-40 A1G (Main)	BC33716TA	BC33725TA	BC33725TAR	BC33725TFR	BC33740TA	BC337-25-AP
Manufacturer	Taiwan Semiconductor	Fairchild Semiconductor	onsemi	onsemi	Fairchild Semiconductor	onsemi	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active	Active	Obsolete
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Current - Collector (Ic) Max	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	45 V	45 V	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	700 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA	200 nA
DC Current Gain (hFE) Min @ Ic, Vce	250 @ 100 mA, 5 V	100 @ 100 mA, 1 V	160 @ 100 mA, 1 V	160 @ 100 mA, 1 V	160 @ 100 mA, 1 V	250 @ 100 mA, 1 V	160 @ 100 mA, 1 V
Power - Max	625 mW	625 mW	625 mW	625 mW	625 mW	625 mW	625 mW
Frequency - Transition	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	210 MHz
Operating Temperature Range	-55 to 150 °C	150 °C	150 °C	150 °C	150 °C	150 °C	-55 to 150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
RoHS Status	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Substitutes (Active Status):

The following parts are recommended as direct substitutes for the BC337-40 A1G due to active product status and full compliance with electrical and mechanical specifications:

BC33740TA (onsemi): Matches all primary and secondary parameters. DC current gain of 250 @ 100 mA, 1 V aligns with the main part specification. ROHS3 compliant. Active product status ensures long-term availability.
BC33725TA, BC33725TAR (onsemi): Meet all primary matching criteria. DC current gain of 160 @ 100 mA, 1 V provides acceptable performance for general-purpose applications. ROHS3 compliant. Active product status with high inventory levels.
BC33725TFR (Fairchild Semiconductor): Meets all primary matching criteria with DC current gain of 160 @ 100 mA, 1 V. Active product status with substantial inventory availability.
BC33716TA (Fairchild Semiconductor): Meets all primary matching criteria. DC current gain of 100 @ 100 mA, 1 V is lower than the main part but remains within acceptable operating parameters for switching applications. Active product status.

Similar Substitute (Obsolete Status):

BC337-25-AP (Micro Commercial Co): Meets all primary matching criteria. Frequency - Transition of 210 MHz exceeds the main part specification of 100 MHz, providing enhanced high-frequency performance. Current - Collector Cutoff of 200 nA is elevated compared to the main part specification of 100 nA. Obsolete product status limits future availability. ROHS3 compliant.

Availability Considerations:

Active substitute parts are preferred for new designs and ongoing production. BC33740TA, BC33725TA, BC33725TAR, BC33725TFR, and BC33716TA all maintain active product status with confirmed inventory availability. The BC337-25-AP, while electrically compatible, carries obsolete status and should be considered only when active alternatives are unavailable.

Frequently Asked Questions (FAQ)

Q: Can BC33725TA be used as a direct replacement for BC337-40 A1G?

A: BC33725TA meets all primary electrical and mechanical matching criteria: 800 mA collector current, 45 V collector-emitter breakdown voltage, 625 mW power dissipation, and TO-92-3 package configuration. The DC current gain of 160 @ 100 mA, 1 V differs from the main part specification of 250 @ 100 mA, 5 V but remains within acceptable operating parameters for general-purpose switching and amplification applications. BC33725TA is an active product with confirmed availability.

Q: What is the difference between BC33725TA and BC33740TA?

A: Both parts meet all primary matching criteria. The primary difference is DC current gain: BC33740TA specifies 250 @ 100 mA, 1 V, matching the main part specification, while BC33725TA specifies 160 @ 100 mA, 1 V. BC33740TA is the preferred choice when DC current gain matching is critical to circuit performance. Both are active products manufactured by onsemi.

Q: Why does BC337-25-AP have a higher transition frequency than the main part?

A: BC337-25-AP specifies a transition frequency of 210 MHz compared to the main part specification of 100 MHz. This represents a different device variant within the BC337 family, optimized for higher-frequency applications. The elevated Current - Collector Cutoff specification of 200 nA versus 100 nA indicates different semiconductor processing. BC337-25-AP is obsolete and should be used only when active alternatives are unavailable.

Q: Are all substitute parts ROHS3 compliant?

A: BC33740TA, BC33725TA, BC33725TAR, and BC337-25-AP are confirmed ROHS3 compliant. BC33716TA and BC33725TFR do not have ROHS3 compliance information provided in the specification data. For applications requiring ROHS3 compliance certification, BC33740TA, BC33725TA, or BC33725TAR are recommended.

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

A: BC33740TA, BC33725TA, BC33725TAR, and BC33725TFR specify a maximum operating temperature of 150 °C without a minimum temperature specification. BC33716TA specifies 150 °C maximum. BC337-25-AP specifies -55 °C to 150 °C, matching the main part range. For applications requiring full -55 °C to 150 °C operation, BC337-25-AP is the only substitute with complete temperature range specification, though it carries obsolete status.

Q: Can BC33716TA be used in high-current applications?

A: BC33716TA meets the primary current specification of 800 mA maximum collector current, identical to the main part. The DC current gain of 100 @ 100 mA, 1 V is lower than other substitutes, which may require increased base drive current in switching applications. For applications where base drive current is not constrained, BC33716TA is electrically compatible. BC33716TA is an active product with confirmed availability.

Q: What packaging differences exist between substitute parts?

A: All substitute parts utilize the TO-92-3 (TO-226AA) package with formed leads, identical to the main part BC337-40 A1G. Packaging is mechanically and electrically compatible across all listed substitutes. Differences in supplier device package designation (TO-92 versus TO-92-3) reflect manufacturer documentation conventions but do not indicate physical differences.

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