BD787 NPN Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The BD787 is an NPN bipolar junction transistor manufactured by onsemi, rated for 60V collector-emitter breakdown voltage and 4A maximum collector current. This device is packaged in the TO-126 through-hole configuration and is rated for 15W maximum power dissipation with a 50MHz transition frequency. The BD787 is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity. The BD787G represents the active production equivalent with identical electrical specifications and enhanced compliance status.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	4	A
Power - Max	15	W
Frequency - Transition	50	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 200mA, 3V	—
Vce Saturation (Max) @ Ib, Ic	2.5V @ 800mA, 4A	V
Current - Collector Cutoff (Max)	100	µA
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the BD787 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must satisfy the following criteria:

Electrical Parameters (Must Match):

Transistor type: NPN
Maximum collector-emitter breakdown voltage: 60V
Maximum collector current: 4A
Maximum power dissipation: 15W
Transition frequency: 50MHz
DC current gain (hFE): 40 minimum at specified conditions
Vce saturation: 2.5V maximum at specified bias conditions
Collector cutoff current: 100µA maximum
Operating temperature range: -65°C to 150°C

Mechanical Parameters (Must Match):

Mounting type: Through Hole
Package designation: TO-126-3

The BD787G meets all specified electrical and mechanical parameters and is therefore classified as a direct equivalent substitute.

Parameter Comparison

Parameter	BD787	BD787G	Match
Transistor Type	NPN	NPN	✓
Voltage - Collector Emitter Breakdown (Max)	60V	60V	✓
Current - Collector (Ic) (Max)	4A	4A	✓
Power - Max	15W	15W	✓
Frequency - Transition	50MHz	50MHz	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 200mA, 3V	40 @ 200mA, 3V	✓
Vce Saturation (Max) @ Ib, Ic	2.5V @ 800mA, 4A	2.5V @ 800mA, 4A	✓
Current - Collector Cutoff (Max)	100µA	100µA	✓
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-126-3	TO-126-3	✓
Product Status	Obsolete	Active	—
RoHS Status	Non-compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

The BD787G is the direct equivalent substitute for the BD787. Both components share identical electrical specifications across all rated parameters and are housed in the same TO-126-3 through-hole package.

Product Status Consideration: The BD787 is classified as obsolete, while the BD787G maintains active production status. For new designs and ongoing production support, the BD787G is the appropriate selection.

Compliance Status: The BD787G is ROHS3 compliant, whereas the BD787 is non-compliant. Applications subject to RoHS requirements must use the BD787G. The BD787G is also REACH unaffected, consistent with the original BD787.

Functional Equivalence: No electrical or mechanical parameter differences exist between these components. Pin configuration, thermal characteristics, and performance under specified operating conditions are identical.

Frequently Asked Questions (FAQ)

Q: Can the BD787G be used as a direct replacement for the BD787 in existing designs?

A: Yes. The BD787G is electrically and mechanically identical to the BD787 across all specified parameters. No circuit modifications are required for substitution.

Q: What is the primary reason to transition from BD787 to BD787G?

A: The BD787 is obsolete and no longer in production. The BD787G is the active equivalent with identical performance specifications. Additionally, the BD787G is ROHS3 compliant, meeting current regulatory requirements.

Q: Are the pin configurations identical between BD787 and BD787G?

A: Yes. Both components use the TO-126-3 package with identical pin assignments and mechanical dimensions.

Q: What are the maximum operating conditions for these transistors?

A: Maximum collector current is 4A, maximum collector-emitter breakdown voltage is 60V, and maximum power dissipation is 15W. Operating temperature range is -65°C to 150°C (junction temperature).

Q: Is thermal management required for these devices?

A: Thermal management depends on application-specific duty cycle and ambient conditions. The 15W power rating and TO-126 package thermal characteristics must be evaluated against circuit requirements.

Q: Are there packaging differences between BD787 and BD787G?

A: Both components are supplied in TO-126-3 through-hole packages. The BD787G is supplied in bulk packaging, while the original BD787 packaging format is not specified in the provided data.

Q: What is the transition frequency specification?

A: The transition frequency (fT) is 50MHz for both components, indicating suitable operation in applications requiring switching speeds up to this frequency.

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