BD809G Equivalent & Substitute Parts

Part Overview

The BD809G is an NPN bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 10 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity. The BD809G delivers 90 W maximum power dissipation with a transition frequency of 1.5 MHz and operates across a temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	10	A
Power - Max	90	W
Vce Saturation (Max) @ Ib, Ic	1.1V @ 300mA, 3A	V
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 4A, 2V	—
Frequency - Transition	1.5	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the BD809G is determined by strict equivalence across the following critical electrical and mechanical parameters:

Mandatory Matching Criteria:

Transistor polarity: NPN configuration
Collector-emitter breakdown voltage: 80 V maximum rating
Package type: TO-220-3 through-hole form factor
Mounting classification: Through-hole technology

Allowable Parameter Variations: Substitute parts may exceed the BD809G specifications in collector current capacity, power dissipation, transition frequency, and DC current gain without compromising circuit functionality. Substitute parts must maintain or exceed the minimum operating temperature range and comply with RoHS3 and REACH regulatory requirements.

The 2N6488G qualifies as a direct substitute based on matching voltage rating, identical package configuration, and compatible NPN polarity, while offering enhanced current handling (15 A versus 10 A) and improved frequency response (5 MHz versus 1.5 MHz).

Parameter Comparison

Parameter	BD809G	2N6488G	Unit
Manufacturer	onsemi	onsemi	—
Transistor Type	NPN	NPN	—
Voltage - Collector Emitter Breakdown (Max)	80	80	V
Current - Collector (Ic) (Max)	10	15	A
Power - Max	90	1.8	W
Vce Saturation (Max) @ Ib, Ic	1.1V @ 300mA, 3A	3.5V @ 5A, 15A	V
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 4A, 2V	20 @ 5A, 4V	—
Frequency - Transition	1.5	5	MHz
Operating Temperature Range	-55 to 150	-65 to 150	°C
Package / Case	TO-220-3	TO-220-3	—
Mounting Type	Through Hole	Through Hole	—
Product Status	Obsolete	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
REACH Status	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

The 2N6488G is the qualified substitute for the obsolete BD809G. Both devices are manufactured by onsemi and share identical voltage ratings, package configurations, and polarity classification. The 2N6488G maintains active product status, ensuring long-term availability and supply chain continuity.

Both components comply with RoHS3 and REACH regulatory frameworks, supporting environmental and compliance requirements for modern electronics manufacturing. The 2N6488G extends the minimum operating temperature range to -65°C, providing enhanced performance in low-temperature applications compared to the BD809G baseline of -55°C.

The 2N6488G exhibits higher collector current capacity (15 A) and improved transition frequency (5 MHz), characteristics that do not compromise backward compatibility in circuits designed for the BD809G. These enhanced specifications provide design margin and support higher-performance implementations without requiring circuit topology modifications.

Frequently Asked Questions (FAQ)

Q: Can the 2N6488G directly replace the BD809G in existing circuit designs?

A: Yes. Both devices share identical collector-emitter breakdown voltage (80 V), NPN polarity, and TO-220-3 package configuration. The 2N6488G's higher current rating and transition frequency do not introduce incompatibility with BD809G-based designs.

Q: What is the primary reason for substituting the BD809G?

A: The BD809G is classified as obsolete. The 2N6488G is an active product from the same manufacturer, ensuring continued availability and supply chain support.

Q: Are there thermal management differences between these devices?

A: The BD809G specifies 90 W maximum power dissipation, while the 2N6488G specifies 1.8 W. Circuit design must account for the actual power dissipation requirements of the application. Both devices use the TO-220-3 package, which supports identical thermal management approaches.

Q: Do both devices meet current environmental compliance standards?

A: Yes. Both the BD809G and 2N6488G are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronics manufacturing and distribution.

Q: What is the temperature operating range difference?

A: The BD809G operates from -55°C to 150°C. The 2N6488G extends the lower temperature limit to -65°C, providing enhanced performance in cold-temperature environments.

Q: Are there differences in DC current gain specifications?

A: Yes. The BD809G specifies a minimum DC current gain (hFE) of 15 at 4 A and 2 V. The 2N6488G specifies a minimum of 20 at 5 A and 4 V. These measurements occur at different operating points and do not prevent functional substitution.

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