BC237A Equivalent & Substitute Parts

Part Overview

The BC237A is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. It features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and maximum power dissipation of 500 mW in a Through Hole TO-92-3 package. The BC237A is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	BC237A Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max)	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min	120 @ 2 mA, 5 V	—
Power - Max	500	mW
Frequency - Transition	250	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the BC237A is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Collector current rating must be equal to or greater than 100 mA
Collector-emitter breakdown voltage must be equal to or greater than 45 V
Maximum power dissipation must be equal to or greater than 500 mW
DC current gain (hFE) must support the intended circuit bias conditions
Mounting type must be Through Hole
Package must be TO-92-3 compatible

Mechanical Compatibility Criteria:

Package / Case: TO-92-3 (TO-226AA)
Supplier Device Package: TO-92-3

The 2N5232A PBFREE meets all substitution criteria. It is an NPN transistor with a maximum collector current of 100 mA, collector-emitter breakdown voltage of 50 V (exceeding the 45 V requirement), maximum power dissipation of 625 mW (exceeding the 500 mW requirement), and is packaged in TO-92-3. The 2N5232A PBFREE is classified as Active, ensuring ongoing availability and supply chain continuity.

Parameter Comparison

Parameter	BC237A	2N5232A PBFREE	Unit
Transistor Type	NPN	NPN	—
Current - Collector (Ic) Max	100	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	50	V
Vce Saturation (Max)	600 mV @ 5 mA, 100 mA	125 mV @ 1 mA, 10 mA	—
Current - Collector Cutoff (Max)	15	30	nA
DC Current Gain (hFE) Min	120 @ 2 mA, 5 V	250 @ 2 mA, 5 V	—
Power - Max	500	625	mW
Operating Temperature (TJ)	150	−65 to 150	°C
Mounting Type	Through Hole	Through Hole	—
Package / Case	TO-92-3	TO-92-3	—
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The 2N5232A PBFREE is a direct substitute for the BC237A in applications requiring NPN bipolar junction transistor functionality within the specified electrical and mechanical parameters.

Compliance and Certification Status:

BC237A: REACH Unaffected, ECCN EAR99, HTSUS 8541.21.0075, Moisture Sensitivity Level 1 (Unlimited)
2N5232A PBFREE: RoHS3 Compliant, REACH Unaffected, ECCN EAR99, HTSUS 8541.21.0095, Moisture Sensitivity Level 1 (Unlimited)

The 2N5232A PBFREE provides enhanced electrical performance characteristics, including higher collector-emitter breakdown voltage (50 V versus 45 V), greater maximum power dissipation (625 mW versus 500 mW), and higher DC current gain (250 versus 120 at 2 mA, 5 V). The 2N5232A PBFREE is manufactured by Central Semiconductor Corp and maintains Active product status, ensuring long-term availability and supply chain reliability. The substitute part is suitable for direct replacement in existing BC237A circuit designs without modification to PCB layout or component footprint.

Frequently Asked Questions (FAQ)

Q: Can the 2N5232A PBFREE be used as a direct replacement for the BC237A?

A: Yes. Both transistors are NPN types in TO-92-3 packages with identical maximum collector current ratings (100 mA) and compatible electrical characteristics. The 2N5232A PBFREE exceeds the BC237A specifications in collector-emitter breakdown voltage, maximum power dissipation, and DC current gain, making it suitable for direct substitution without circuit modification.

Q: What are the key differences between the BC237A and 2N5232A PBFREE?

A: The primary differences are: (1) Collector-emitter breakdown voltage: 2N5232A PBFREE is rated at 50 V versus BC237A at 45 V; (2) Maximum power dissipation: 2N5232A PBFREE is rated at 625 mW versus BC237A at 500 mW; (3) DC current gain: 2N5232A PBFREE minimum is 250 versus BC237A minimum of 120 at 2 mA, 5 V; (4) Product status: 2N5232A PBFREE is Active while BC237A is Obsolete; (5) Operating temperature range: 2N5232A PBFREE operates from −65°C to 150°C versus BC237A at 150°C maximum.

Q: Are the package dimensions identical between BC237A and 2N5232A PBFREE?

A: Both transistors use the TO-92-3 (TO-226AA) Through Hole package. Pin configuration and physical dimensions are compatible, allowing direct PCB footprint compatibility without layout modification.

Q: What is the impact of the higher DC current gain in the 2N5232A PBFREE?

A: The 2N5232A PBFREE has a minimum DC current gain (hFE) of 250 at 2 mA, 5 V, compared to the BC237A minimum of 120 at the same conditions. This higher gain may affect bias point calculations in circuits designed specifically for the BC237A. Circuit analysis is required to confirm compatibility in applications with tight bias specifications.

Q: Is the 2N5232A PBFREE RoHS compliant?

A: Yes. The 2N5232A PBFREE is RoHS3 Compliant. The BC237A does not specify RoHS compliance status. Both parts are REACH Unaffected and classified under ECCN EAR99.

Q: What is the availability status of these parts?

A: The BC237A is classified as Obsolete with 713 pieces in stock. The 2N5232A PBFREE is classified as Active with 17,706 pieces in stock, providing superior long-term supply chain continuity and procurement reliability.

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