BD237-BP Equivalent & Substitute Parts

Part Overview

The BD237-BP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, rated for 80 V collector-emitter breakdown voltage and 2 A maximum collector current. This device is packaged in TO-126 through-hole configuration and is designed for general-purpose switching and amplification applications. The BD237-BP is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

BD237-BP

Micro Commercial CoIn Stock: 878BD237-BP Datasheet

Current PartRFQ

BD237G

onsemiIn Stock: 11573BD237G Datasheet

DirectRFQ

BD237

STMicroelectronicsIn Stock: 21205BD237 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BD237-BP are identified based on strict electrical and mechanical parameter matching. The primary criteria for substitution are:

Electrical Parameters (Must Match):

• Transistor Type: NPN
• Voltage - Collector Emitter Breakdown (Max): 80 V
• Current - Collector (Ic) (Max): 2 A
• Vce Saturation (Max) @ Ib, Ic: 600mV @ 100mA, 1A
• Current - Collector Cutoff (Max): 100µA (ICBO)
• Frequency - Transition: 3MHz

Mechanical Parameters (Must Match or Be Compatible):

• Mounting Type: Through Hole
• Package / Case: TO-225AA, TO-126-3 or equivalent through-hole package

Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes: Parts that maintain identical electrical specifications and compatible packaging, allowing direct replacement without circuit modification.

Similar Manufacturer Substitutes: Parts that meet core electrical requirements but may have different package designations or enhanced specifications, requiring physical compatibility verification.

Parameter Comparison

Engineering Selection Recommendations

BD237G (onsemi) - Direct Manufacturer Substitute

The BD237G is the primary substitute for the BD237-BP. This part is manufactured by onsemi and maintains identical electrical specifications across all critical parameters: 80 V breakdown voltage, 2 A collector current, 600mV saturation voltage, and 3MHz transition frequency. The BD237G is supplied in TO-126 package configuration, ensuring direct mechanical compatibility. The part is currently in active production status with ROHS3 compliance certification. The enhanced power rating (25 W versus 1.25 W) and extended operating temperature range (-55°C to 150°C) provide additional design margin without affecting circuit operation. This part is suitable for direct replacement in existing designs.

BD237 (STMicroelectronics) - Similar Manufacturer Substitute

The BD237 manufactured by STMicroelectronics meets all core electrical requirements: 80 V breakdown voltage, 2 A collector current, and 600mV saturation voltage. This part is supplied in SOT-32-3 package configuration, which is mechanically compatible with TO-225AA and TO-126-3 case designations. The part is currently in active production status with ROHS3 compliance certification. The enhanced power rating (25 W) provides additional thermal capability. Physical board layout verification is required to confirm SOT-32-3 package compatibility with existing TO-126 footprints, as pin spacing may differ.

Frequently Asked Questions (FAQ)

Q: Can BD237G be used as a direct replacement for BD237-BP?

A: Yes. The BD237G maintains identical electrical specifications for voltage, current, saturation characteristics, and transition frequency. Both parts are supplied in TO-126 package configuration, enabling direct mechanical substitution without circuit modification or board redesign.

Q: What is the difference between BD237G and BD237 (STMicroelectronics)?

A: Both parts meet the core electrical requirements of the BD237-BP. The primary difference is package designation: BD237G uses TO-126 package, while the STMicroelectronics BD237 uses SOT-32-3 package. Pin configurations are compatible, but physical board layout must be verified for SOT-32-3 footprint compatibility.

Q: Why does the BD237G have a higher power rating than the BD237-BP?

A: The BD237G is rated for 25 W maximum power dissipation compared to 1.25 W for the BD237-BP. This represents an enhanced thermal design in the substitute part. The higher power rating does not affect circuit operation and provides additional design margin for thermal management.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both BD237G and BD237 (STMicroelectronics) are ROHS3 compliant, matching the compliance status of the BD237-BP.

Q: What is the operating temperature range for each part?

A: The BD237-BP and BD237 (STMicroelectronics) are rated to 150°C maximum junction temperature. The BD237G extends this range to -55°C to 150°C, providing broader environmental operating capability.

Q: Can I use the STMicroelectronics BD237 if my board is designed for TO-126 package?

A: Physical compatibility must be verified. The STMicroelectronics BD237 uses SOT-32-3 package designation. While pin configurations are compatible with TO-225AA and TO-126-3 case families, the actual footprint dimensions may differ. Board layout review is required before substitution.

Q: What is the DC current gain difference between these parts?

A: The BD237-BP specifies minimum DC current gain (hFE) of 40 at 150mA collector current and 2V Vce. The BD237G and STMicroelectronics BD237 specify minimum hFE of 25 at 1A collector current and 2V Vce. Both specifications meet the electrical requirements for NPN transistor operation in the specified voltage and current ranges.

Q: Are there inventory considerations for selecting a substitute?

A: The BD237-BP is classified as obsolete with 768 pieces in stock. The BD237G (onsemi) has 11,547 pieces available, and the BD237 (STMicroelectronics) has 21,100 pieces available. Active production status for both substitute parts ensures long-term availability.