BD244B PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The BD244B is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 6 A maximum collector current in a TO-220-3 through-hole package. The device is classified as RoHS non-compliant and is no longer in active production. Due to its obsolete status, equivalent and substitute parts are necessary for circuit redesign, board refresh, or inventory replenishment in applications requiring PNP transistor functionality within the specified electrical parameters.

Key Parameters

Parameter	BD244B Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	6	A
Power - Max	65	W
Frequency - Transition	3	MHz
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the BD244B is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor polarity: PNP
Voltage rating: 80 V collector-emitter breakdown (minimum)
Current rating: 6 A collector current (minimum)
Package type: TO-220-3 through-hole configuration
Operating temperature range: -65°C to 150°C (minimum overlap required)

Secondary Compatibility Factors:

Vce saturation characteristics at specified base and collector currents
DC current gain (hFE) at rated operating points
Transition frequency capability
Power dissipation rating

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria) and Enhanced Substitutes (exceeding primary criteria with improved specifications or compliance status).

Parameter Comparison

Parameter	BD244B	TIP42BG	TIP32BG	D45VH10G	Unit
Product Status	Obsolete	Last Time Buy	Active	Active	—
Transistor Type	PNP	PNP	PNP	PNP	—
Voltage - Collector Emitter Breakdown (Max)	80	80	80	80	V
Current - Collector (Ic) (Max)	6	6	3	15	A
Power - Max	65	2	2	83	W
Frequency - Transition	3	3	3	50	MHz
Operating Temperature Range	-65 to 150	-65 to 150	-65 to 150	-55 to 150	°C (TJ)
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	—
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	—
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Vce Saturation (Max) @ Ib, Ic	1.5V @ 1A, 6A	1.5V @ 600mA, 6A	1.2V @ 375mA, 3A	1V @ 800mA, 8A	V @ mA, A
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 3A, 4V	15 @ 3A, 4V	10 @ 3A, 4V	20 @ 4A, 1V	—
Current - Collector Cutoff (Max)	700µA	700µA	300µA	—	µA

Engineering Selection Recommendations

TIP42BG is the direct electrical equivalent to BD244B, matching all primary substitution criteria including 6 A collector current, 80 V breakdown voltage, 3 MHz transition frequency, and -65°C to 150°C operating temperature range. TIP42BG holds Last Time Buy status and is ROHS3 compliant, making it suitable for immediate replacement in existing designs. Vce saturation and DC current gain parameters are identical to the BD244B.

D45VH10G is an enhanced substitute offering superior specifications: 15 A maximum collector current (2.5× the BD244B rating), 83 W power dissipation (1.3× the BD244B rating), and 50 MHz transition frequency (16.7× the BD244B rating). D45VH10G is in active production with ROHS3 compliance. The operating temperature range is -55°C to 150°C, which does not extend to the full -65°C lower limit of the BD244B. D45VH10G is appropriate for applications requiring higher current capacity or faster switching performance within the -55°C to 150°C thermal envelope.

TIP32BG is a reduced-current substitute rated for 3 A maximum collector current, which is below the 6 A requirement of the BD244B. TIP32BG is in active production with ROHS3 compliance and identical operating temperature range. This part is suitable only for circuit redesigns where collector current requirements can be reduced to 3 A or lower.

For new designs and inventory replenishment, D45VH10G is recommended due to active production status, enhanced electrical performance, and full ROHS3 compliance. For direct replacement in existing applications, TIP42BG provides electrical equivalence with improved compliance status.

Frequently Asked Questions (FAQ)

Q: Can TIP42BG be used as a direct replacement for BD244B in existing circuits?

A: Yes. TIP42BG is electrically equivalent to BD244B across all critical parameters: 6 A collector current, 80 V breakdown voltage, 3 MHz transition frequency, identical Vce saturation and DC current gain specifications, and matching -65°C to 150°C operating temperature range. Pin configuration and TO-220-3 package are identical. No circuit modifications are required.

Q: What is the difference between D45VH10G and BD244B?

A: D45VH10G exceeds BD244B specifications in three areas: collector current (15 A vs. 6 A), power dissipation (83 W vs. 65 W), and transition frequency (50 MHz vs. 3 MHz). The operating temperature range of D45VH10G is -55°C to 150°C, which does not include the full -65°C lower limit of BD244B. All other parameters including voltage rating, package type, and mounting configuration are compatible.

Q: Why is TIP32BG listed as a substitute if it only handles 3 A?

A: TIP32BG is listed as a compatible substitute for applications where circuit redesign permits reduction of collector current requirements to 3 A or lower. It maintains the same voltage rating, package type, and operating temperature range as BD244B. It is not a direct replacement for circuits requiring the full 6 A current capacity.

Q: Are all substitute parts RoHS compliant?

A: BD244B is RoHS non-compliant. All three substitute parts (TIP42BG, TIP32BG, and D45VH10G) are ROHS3 compliant, making them suitable for applications with RoHS compliance requirements.

Q: Can D45VH10G be used in circuits designed for BD244B if the operating temperature never drops below -55°C?

A: Yes. If the application environment guarantees operating temperatures remain above -55°C, D45VH10G is fully compatible with BD244B circuits. The enhanced current and power ratings of D45VH10G provide additional design margin. Pin configuration and TO-220-3 package are identical.

Q: What is the inventory status of these substitute parts?

A: BD244B has 4,207 pieces in stock (obsolete status). TIP42BG has 2,100 pieces available (Last Time Buy status). TIP32BG has 3,700 pieces available (active production). D45VH10G has 50,501 pieces available (active production). For long-term availability, D45VH10G and TIP32BG are preferred due to active production status.

Q: Are there any differences in saturation voltage between BD244B and TIP42BG?

A: No. Both devices specify 1.5 V maximum Vce saturation at 1 A base current and 6 A collector current. Saturation characteristics are identical.

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