2SD1979GSL Equivalent & Substitute Parts

Part Overview

The 2SD1979GSL is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, designed for surface mount applications in the SMini3-F2 package. This device is rated for 20 V collector-emitter breakdown voltage with a maximum collector current of 300 mA and 150 mW power dissipation. The transistor operates at frequencies up to 80 MHz and is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

2SD1979GSL

Panasonic Electronic ComponentsIn Stock: 9372SD1979GSL Datasheet

Current PartRFQ

BC847CW-TP

Micro Commercial CoIn Stock: 5000392BC847CW-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2SD1979GSL requires identification of NPN bipolar junction transistors with compatible electrical and mechanical characteristics. The primary substitution criteria are based on the following parameters:

Voltage Rating Compatibility: The substitute must support the collector-emitter breakdown voltage requirement. The 2SD1979GSL operates at 20 V maximum; substitutes with equal or higher voltage ratings are acceptable.

Current Handling Capability: The maximum collector current of 300 mA establishes the minimum current requirement. Substitutes with equal or greater current ratings maintain functional equivalence.

Power Dissipation: The 150 mW power rating defines thermal performance requirements. Substitutes must support this power level or higher.

Frequency Response: The 80 MHz transition frequency establishes the upper frequency limit for signal processing applications. Substitutes with equal or higher transition frequencies are acceptable.

Package and Mounting: Surface mount configuration with compatible pinout and footprint ensures mechanical and electrical integration without redesign.

DC Current Gain: The minimum hFE of 500 at specified conditions ensures amplification characteristics remain within design parameters.

The BC847CW-TP meets these substitution criteria with higher voltage and frequency ratings, providing enhanced performance margins while maintaining NPN topology and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

The BC847CW-TP is an active product available from Micro Commercial Co with established supply chain continuity, addressing the obsolescence status of the 2SD1979GSL. Both devices are classified as MSL 1 (Unlimited) and carry identical ECCN and HTSUS codes, ensuring regulatory and compliance alignment.

The BC847CW-TP provides enhanced voltage rating (45 V versus 20 V) and higher transition frequency (100 MHz versus 80 MHz), delivering improved performance margins for signal processing applications. However, the BC847CW-TP is rated for 100 mA maximum collector current, which is lower than the 2SD1979GSL specification of 300 mA. This current limitation requires circuit-level evaluation to confirm compatibility with existing designs.

Both devices employ surface mount technology with MSL 1 moisture sensitivity classification, supporting identical handling and storage protocols. The BC847CW-TP is supplied in SOT-323 package format, which differs from the 2SD1979GSL SMini3-F2 package, necessitating PCB layout modification.

Selection of the BC847CW-TP is appropriate for applications where collector current requirements do not exceed 100 mA and where the enhanced voltage and frequency specifications provide design benefits. Applications requiring the full 300 mA collector current capability require alternative substitutes with higher current ratings.

Frequently Asked Questions (FAQ)

Q: Can the BC847CW-TP directly replace the 2SD1979GSL without circuit modification?

A: Direct replacement requires evaluation of collector current requirements. The BC847CW-TP maximum collector current of 100 mA is lower than the 2SD1979GSL specification of 300 mA. If the application operates within 100 mA, substitution is feasible. PCB layout modification is required due to package differences (SOT-323 versus SMini3-F2).

Q: What are the key electrical differences between these devices?

A: The BC847CW-TP provides higher voltage rating (45 V versus 20 V) and higher transition frequency (100 MHz versus 80 MHz). The 2SD1979GSL supports higher collector current (300 mA versus 100 mA). DC current gain specifications differ at different operating points: 2SD1979GSL at 500 @ 4mA, 2V versus BC847CW-TP at 420 @ 2mA, 5V.

Q: Are there package compatibility considerations?

A: Yes. The 2SD1979GSL uses SMini3-F2 package while the BC847CW-TP uses SOT-323 package. These packages have different pinout footprints and physical dimensions, requiring PCB redesign for mechanical and electrical integration.

Q: What is the moisture sensitivity classification for both devices?

A: Both the 2SD1979GSL and BC847CW-TP are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Identical handling and storage protocols apply to both devices.

Q: Is the BC847CW-TP suitable for high-frequency applications?

A: The BC847CW-TP transition frequency of 100 MHz exceeds the 2SD1979GSL specification of 80 MHz, providing enhanced high-frequency performance. Applications operating at or below 80 MHz are fully supported.

Q: What is the product availability status for each device?

A: The 2SD1979GSL is classified as obsolete with 846 pieces in current inventory. The BC847CW-TP is an active product with 5,000,300 pieces in inventory, ensuring long-term supply chain continuity.