BC337-40 Equivalent & Substitute Parts

Part Overview

The BC337-40 is an NPN bipolar junction transistor (BJT) manufactured by Diotec Semiconductor in a through-hole TO-92 package. This device is rated for 45V collector-emitter breakdown voltage and 800mA maximum collector current, making it suitable for general-purpose switching and amplification applications. The part is currently in active production status with 5168 units in stock. Substitute parts are identified to provide design flexibility, supply chain alternatives, and equivalent performance across different manufacturer sources.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the BC337-40 is determined by strict equivalence across the following critical parameters:

Transistor Type: NPN configuration required
Current Rating: 800mA maximum collector current
Voltage Rating: 45V collector-emitter breakdown voltage
Saturation Characteristics: Vce saturation at specified base and collector currents
Current Gain: Minimum DC current gain (hFE) of 250 at 100mA, 1V
Power Dissipation: 625mW maximum power rating
Frequency Response: 100MHz transition frequency
Package: TO-92-3 through-hole configuration with formed leads
Leakage Current: 100nA maximum collector cutoff current

The BC33740TA manufactured by onsemi meets all specified electrical and mechanical parameters and is classified as a parametric equivalent. Both devices share identical electrical performance characteristics and package specifications, enabling direct substitution in circuit applications.

Parameter Comparison

Parameter	BC337-40 (Diotec)	BC33740TA (onsemi)	Match
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) Max	800 mA	800 mA	✓
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	✓
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	✓
Current - Collector Cutoff (Max)	100 nA	100 nA	✓
DC Current Gain (hFE) Min @ Ic, Vce	250 @ 100mA, 1V	250 @ 100mA, 1V	✓
Power - Max	625 mW	625 mW	✓
Frequency - Transition	100 MHz	100 MHz	✓
Operating Temperature (TJ)	-55°C to 150°C	150°C	✓
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	✓
Mounting Type	Through Hole	Through Hole	✓
Product Status	Active	Active	✓

Engineering Selection Recommendations

Both the BC337-40 and BC33740TA are active production devices suitable for direct substitution. The BC33740TA manufactured by onsemi carries ROHS3 compliance certification and REACH unaffected status, providing additional regulatory alignment for applications subject to environmental standards. The BC337-40 from Diotec Semiconductor maintains active product status with established supply availability. Selection between these devices should be based on supply chain requirements, inventory availability, and regulatory compliance mandates specific to the end application. Both devices are classified under ECCN EAR99 and share identical HTSUS commodity codes.

Frequently Asked Questions (FAQ)

Q: Can BC33740TA replace BC337-40 in existing designs?

A: Yes. The BC33740TA is a parametric equivalent with identical electrical specifications across all critical parameters including current rating, voltage rating, saturation characteristics, current gain, power dissipation, and frequency response. The TO-92-3 package configuration is mechanically identical, enabling direct pin-for-pin substitution.

Q: Are there differences in operating temperature ranges?

A: The BC337-40 specifies an operating temperature range of -55°C to 150°C (TJ). The BC33740TA specifies 150°C (TJ). Both devices operate within the same maximum temperature limit. Applications requiring operation below -55°C require verification against the BC33740TA datasheet specifications.

Q: What are the package compatibility considerations?

A: Both devices use the TO-92-3 (TO-226AA) through-hole package with formed leads. Pin configuration and mechanical dimensions are identical, allowing direct substitution on printed circuit boards without layout modifications.

Q: How do the regulatory certifications differ?

A: The BC33740TA carries ROHS3 compliance and REACH unaffected status. The BC337-40 lists RoHS status as not applicable. Applications requiring ROHS3 compliance should specify the BC33740TA.

Q: Are there inventory or lead time considerations?

A: The BC33740TA has 21100 units in stock compared to 5168 units for the BC337-40. Supply chain requirements may favor the onsemi device for high-volume applications or extended delivery schedules.

Q: What is the base product relationship between BC33740TA and BC337-40?

A: Both devices are variants of the BC337 series NPN transistor. The BC33740TA lists BC33740 as the base product number. Both share the same electrical performance class and are interchangeable for circuit applications.

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