BD234 Equivalent & Substitute Parts

Part Overview

The BD234 is a PNP bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 2 A maximum collector current. The device is packaged in a TO-126 through-hole configuration and delivers 25 W maximum power dissipation with a 3 MHz transition frequency. The BD234 is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Transistor Type	PNP
Current - Collector (Ic) (Max)	2 A
Voltage - Collector Emitter Breakdown (Max)	45 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 100 mA, 1 A
Current - Collector Cutoff (Max)	100 µA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 1 A, 2 V
Power - Max	25 W
Frequency - Transition	3 MHz
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-225AA, TO-126-3

Substitute Part Grouping Explanation

Substitution of the BD234 is determined by electrical and mechanical parameter equivalence. The critical parameters governing substitution are:

Transistor polarity (PNP)
Maximum collector current (2 A)
Maximum collector-emitter breakdown voltage (45 V)
Saturation voltage characteristics (600 mV @ 100 mA, 1 A)
DC current gain minimum (25 @ 1 A, 2 V)
Maximum power dissipation (25 W)
Transition frequency (3 MHz)
Operating temperature range (-55°C ~ 150°C)
Through-hole mounting configuration
TO-126 package compatibility

The BD234G meets all electrical and mechanical specifications identical to the BD234, establishing it as a direct functional equivalent. Both devices share the same base product number (BD234) and are manufactured by onsemi.

Parameter Comparison

Parameter	BD234	BD234G
Manufacturer	onsemi	onsemi
Transistor Type	PNP	PNP
Current - Collector (Ic) (Max)	2 A	2 A
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 100 mA, 1 A	600 mV @ 100 mA, 1 A
Current - Collector Cutoff (Max)	100 µA (ICBO)	100 µA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 1 A, 2 V	25 @ 1 A, 2 V
Power - Max	25 W	25 W
Frequency - Transition	3 MHz	3 MHz
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-225AA, TO-126-3	TO-225AA, TO-126-3
Product Status	Obsolete	Last Time Buy
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The BD234G is the direct substitute for the BD234. Both components are manufactured by onsemi and share identical electrical specifications and mechanical packaging. The BD234G is classified as Last Time Buy status, indicating limited availability for future procurement.

The primary distinction between the two parts is regulatory compliance. The BD234G achieves ROHS3 compliance, whereas the BD234 is RoHS non-compliant. For applications subject to RoHS requirements or environmental regulations, the BD234G is the appropriate selection. Both devices maintain REACH Unaffected status and EAR99 export classification.

Electrical performance is equivalent across all specified parameters, including current ratings, voltage ratings, saturation characteristics, gain specifications, power dissipation, frequency response, and operating temperature range. Pin configuration and PCB footprint compatibility are maintained through identical TO-126 packaging.

Frequently Asked Questions (FAQ)

Q: Can BD234G be used as a direct replacement for BD234 in existing designs?

A: Yes. The BD234G is electrically and mechanically equivalent to the BD234. All electrical parameters, including collector current, breakdown voltage, saturation voltage, current gain, power rating, and frequency response, are identical. The TO-126 package and pin configuration are unchanged.

Q: What is the difference between BD234 and BD234G?

A: The primary differences are product status and regulatory compliance. The BD234 is obsolete and RoHS non-compliant. The BD234G is Last Time Buy status and ROHS3 compliant. Electrical specifications and packaging are identical.

Q: Is the BD234G suitable for new designs?

A: The BD234G is suitable for new designs from an electrical and mechanical standpoint. However, Last Time Buy status indicates limited future availability. Long-term design strategies should consider alternative PNP transistors with extended product lifecycles.

Q: Are there any thermal or mounting considerations when substituting BD234 with BD234G?

A: No. Both devices operate across the same temperature range (-55°C ~ 150°C) and use identical through-hole TO-126 packaging. Thermal management and PCB mounting requirements remain unchanged.

Q: What is the significance of RoHS compliance for this substitution?

A: RoHS compliance is a regulatory requirement in many markets. The BD234G meets ROHS3 standards, making it suitable for applications subject to RoHS directives. The BD234, being RoHS non-compliant, may not be acceptable for such applications.

Q: Can BD234 and BD234G be mixed in the same production batch?

A: From an electrical and mechanical perspective, yes. However, procurement and quality documentation practices should maintain consistency. Mixing parts with different compliance statuses may complicate traceability and regulatory documentation.

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