BD233-BP Equivalent & Substitute Parts

Part Overview

The BD233-BP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, rated for 45V collector-emitter breakdown voltage and 2A maximum collector current. This component is designed for through-hole mounting in TO-126 package configuration and operates at a maximum junction temperature of 150°C with 1.25W power dissipation capability.

The BD233-BP is classified as an obsolete product. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	2	A
Power - Max	1.25	W
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	—
Vce Saturation (Max)	600mV @ 100mA, 1A	—
Current - Collector Cutoff (Max)	100µA	—
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-225AA, TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the BD233-BP is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown rating must equal or exceed 45V
DC Current Gain (hFE) minimum specification must meet or exceed 40 @ 150mA, 2V
Operating temperature rating must support 150°C junction temperature
Power dissipation capability must support 1.25W minimum

Mechanical Compatibility Criteria:

Mounting type must be Through Hole
Package configuration must be compatible with TO-126 footprint applications

The BD135 substitute part satisfies these criteria through equivalent electrical ratings and compatible through-hole mounting configuration, despite differences in maximum collector current specification and package designation.

Parameter Comparison

Parameter	BD233-BP (Main Part)	BD135 (Substitute)	Compatibility
Manufacturer	Micro Commercial Co	STMicroelectronics	Different
Transistor Type	NPN	NPN	Match
Voltage - Collector Emitter Breakdown (Max)	45V	45V	Match
Current - Collector (Ic) (Max)	2A	1.5A	Reduced
Power - Max	1.25W	1.25W	Match
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	40 @ 150mA, 2V	Match
Vce Saturation (Max)	600mV @ 100mA, 1A	500mV @ 50mA, 500mA	Different
Current - Collector Cutoff (Max)	100µA	100nA	Improved
Operating Temperature (TJ)	150°C	150°C	Match
Mounting Type	Through Hole	Through Hole	Match
Package / Case	TO-225AA, TO-126-3	TO-225AA, TO-126-3	Match
Product Status	Obsolete	Active	Active Available
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match

Engineering Selection Recommendations

The BD135 manufactured by STMicroelectronics is an active product substitute for the obsolete BD233-BP. Both components share identical voltage ratings (45V), power dissipation (1.25W), DC current gain specifications (40 @ 150mA, 2V), and operating temperature limits (150°C).

The BD135 provides improved collector cutoff current performance (100nA versus 100µA) and lower saturation voltage characteristics. The maximum collector current specification of the BD135 is 1.5A compared to 2A for the BD233-BP; this represents a design constraint that must be evaluated against application current requirements.

Both parts maintain ROHS3 compliance and identical through-hole mounting configuration with TO-126-3 package compatibility. The BD135 active product status ensures ongoing availability and supply chain support compared to the obsolete BD233-BP.

Frequently Asked Questions (FAQ)

Q: Can the BD135 directly replace the BD233-BP in existing designs?

A: The BD135 is electrically compatible for applications operating at collector currents of 1.5A or below. Applications requiring the full 2A collector current capability of the BD233-BP require design evaluation. Both parts share identical voltage ratings, power dissipation, current gain specifications, and operating temperature limits.

Q: What are the key differences between these parts?

A: The primary differences are maximum collector current (BD233-BP: 2A; BD135: 1.5A), collector cutoff current (BD233-BP: 100µA; BD135: 100nA), and saturation voltage characteristics. The BD135 offers improved leakage performance and lower saturation voltage at reduced current levels.

Q: Are the packages physically compatible?

A: Both the BD233-BP and BD135 utilize through-hole mounting with TO-126-3 package configuration. Physical footprint compatibility is confirmed for PCB applications designed for TO-126 mounting.

Q: What is the compliance status of the BD135?

A: The BD135 is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). Compliance specifications match the BD233-BP requirements.

Q: Why is the BD233-BP listed as obsolete?

A: The BD233-BP is classified as an obsolete product by the manufacturer. The BD135 represents an active alternative with equivalent electrical specifications and improved performance characteristics in collector cutoff current.

Q: Are there any thermal considerations when substituting these parts?

A: Both parts share identical maximum junction temperature ratings of 150°C and power dissipation limits of 1.25W. Thermal management requirements remain equivalent between the two components.

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