Equivalent & Substitute Parts for 2SD1683S

Part Overview

The 2SD1683S is an NPN bipolar junction transistor manufactured by onsemi, rated for 50 V collector-emitter breakdown voltage and 4 A maximum collector current. This device is packaged in TO-126ML through-hole configuration and is designed for general-purpose switching and amplification applications with a maximum power dissipation of 1.5 W.

The 2SD1683S is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production, repair, and redesign applications. Substitute devices must maintain functional compatibility within the electrical and mechanical constraints of the original design.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	4	A
Power - Max	1.5	W
Frequency - Transition	150	MHz
Mounting Type	Through Hole	—
Operating Temperature (Max)	150	°C
Vce Saturation (Max)	500 mV @ 100 mA, 2 A	—
DC Current Gain (hFE) (Min)	100 @ 100 mA, 2 V	—

Substitute Part Grouping Explanation

Substitution of the 2SD1683S is determined by the following critical electrical parameters:

Transistor Type: Must be NPN
Voltage Rating: Collector-emitter breakdown voltage must be greater than or equal to 50 V
Current Rating: Maximum collector current must be greater than or equal to 4 A
Power Dissipation: Maximum power rating must support the application requirements
Mounting Configuration: Through-hole package compatibility with TO-126 or equivalent footprints
Operating Temperature: Maximum junction temperature of 150°C or higher

Substitute parts are grouped based on whether they meet or exceed these parameters while maintaining through-hole mounting compatibility. Parts with lower voltage or current ratings are not suitable for direct substitution. Parts with different package types (such as SOT-32) may require PCB layout modifications but remain electrically compatible if electrical parameters are satisfied.

Parameter Comparison

Parameter	2SD1683S	BD17510STU	BD17516STU	BD787G	BD437
Manufacturer	onsemi	onsemi	onsemi	onsemi	STMicroelectronics
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50 V	45 V	45 V	60 V	45 V
Current - Collector (Ic) (Max)	4 A	3 A	3 A	4 A	4 A
Power - Max	1.5 W	30 W	30 W	15 W	36 W
Frequency - Transition	150 MHz	3 MHz	3 MHz	50 MHz	3 MHz
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C
Vce Saturation (Max)	500 mV @ 100 mA, 2 A	800 mV @ 100 mA, 1 A	800 mV @ 100 mA, 1 A	2.5 V @ 800 mA, 4 A	600 mV @ 200 mA, 2 A
DC Current Gain (hFE) (Min)	100 @ 100 mA, 2 V	63 @ 150 mA, 2 V	100 @ 150 mA, 2 V	40 @ 200 mA, 3 V	30 @ 10 mA, 5 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-126-3	TO-126-3	TO-126-3	TO-126-3	SOT-32-3
Product Status	Obsolete	Last Time Buy	Active	Active	Not For New Designs
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BD17516STU is the primary substitute for the 2SD1683S. This device is manufactured by onsemi with Active product status, ensuring long-term availability. It maintains TO-126-3 package compatibility and is ROHS3 compliant. While the BD17516STU has a lower maximum collector current rating (3 A versus 4 A) and lower voltage rating (45 V versus 50 V), it is suitable for applications where the design does not require the full 4 A current capability or 50 V voltage margin. The DC current gain (hFE) of 100 at 150 mA, 2 V matches the original specification.

BD787G is an alternative substitute with Active product status and onsemi manufacturing. This device maintains the 4 A current rating and exceeds the voltage rating at 60 V. The TO-126-3 package is compatible with the original footprint. The transition frequency of 50 MHz is lower than the original 150 MHz, making this device suitable for lower-frequency applications. The higher power rating (15 W) provides additional thermal margin.

BD437 is manufactured by STMicroelectronics with ROHS3 compliance. This device maintains the 4 A current rating and 45 V voltage rating. The SOT-32-3 package differs from the original TO-126-3, requiring PCB layout modification. The product status is Not For New Designs, limiting its suitability for new development.

BD17510STU has Last Time Buy status, indicating limited future availability. This device is not recommended for new designs or long-term production applications.

Frequently Asked Questions (FAQ)

Q: Can the BD17516STU replace the 2SD1683S in all applications?

A: The BD17516STU is suitable for applications where the design does not require the full 4 A collector current or 50 V voltage margin of the original device. The lower current rating (3 A maximum) and voltage rating (45 V maximum) must be verified against circuit requirements. The DC current gain and operating temperature range are compatible.

Q: What is the difference between the BD17516STU and BD17510STU?

A: Both devices have identical electrical specifications (45 V, 3 A, TO-126-3 package). The primary difference is product status: BD17516STU is Active, while BD17510STU is Last Time Buy. The BD17516STU is recommended for new designs and ongoing production due to superior availability.

Q: Why does the BD787G have a higher Vce saturation voltage than the 2SD1683S?

A: The BD787G exhibits higher saturation voltage (2.5 V at 800 mA, 4 A) compared to the 2SD1683S (500 mV at 100 mA, 2 A) due to different transistor design and current handling characteristics. This parameter must be evaluated in the specific circuit context to determine acceptability.

Q: Is the BD437 package change from TO-126-3 to SOT-32-3 a significant concern?

A: The SOT-32-3 package has a different physical footprint than the original TO-126-3. PCB layout modification is required for mounting. The electrical performance is compatible, but the package change necessitates design review and potential board redesign.

Q: Which substitute part has the best long-term availability?

A: The BD17516STU has Active product status from onsemi, indicating ongoing production and long-term availability. The BD787G also has Active status. Both are suitable for applications requiring sustained component supply.

Q: Can I use the BD787G in high-frequency applications?

A: The BD787G has a transition frequency of 50 MHz, which is lower than the original 2SD1683S at 150 MHz. For applications requiring frequencies above 50 MHz, the BD787G is not suitable. The original 2SD1683S or equivalent high-frequency devices must be used.

Q: Are all substitute parts RoHS3 compliant?

A: The BD17516STU, BD17510STU, BD787G, and BD437 are all ROHS3 compliant. The original 2SD1683S RoHS status is not specified in the provided data.

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