FSB6726 Equivalent & Substitute Parts

Part Overview

The FSB6726 is a PNP bipolar junction transistor manufactured by onsemi, rated for 30 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a surface mount SOT-23-3 package. This device is classified as obsolete, indicating discontinued production and limited availability. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

FSB6726

onsemiIn Stock: 962FSB6726 Datasheet

Current PartRFQ

NSS30100LT1G

onsemiIn Stock: 32091NSS30100LT1G Datasheet

DirectRFQ

2STR2230

STMicroelectronicsIn Stock: 2094722STR2230 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSB6726 is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

• Transistor polarity (PNP)
• Collector-emitter breakdown voltage (30 V minimum)
• Maximum collector current (1.5 A or greater)
• Maximum power dissipation (500 mW or greater)
• Package type (SOT-23-3 surface mount)
• Operating temperature range (-55°C to 150°C or wider)
• Moisture sensitivity level (MSL 1 or equivalent)

Substitution Categories:

Direct Equivalent (NSS30100LT1G): This onsemi part maintains identical voltage and package specifications but operates at reduced maximum collector current (1 A) and power dissipation (310 mW). This part is suitable for applications where the full 1.5 A current capability is not required. The part is active and widely available.

Upgrade Equivalent (2STR2230): This STMicroelectronics part matches or exceeds all electrical specifications of the FSB6726, including 1.5 A collector current and 500 mW power dissipation. The operating temperature range extends to -65°C, providing enhanced low-temperature performance. This part is active and carries RoHS3 compliance certification.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Current-Limited Applications): The NSS30100LT1G is an active onsemi product suitable for applications where collector current does not exceed 1 A. This part maintains identical voltage specifications and package form factor. The reduced power dissipation (310 mW versus 500 mW) requires verification that thermal design margins remain adequate. This part carries ROHS3 compliance and unlimited moisture sensitivity rating.

For Full-Specification Replacement (Current-Demanding Applications): The 2STR2230 is an active STMicroelectronics product that matches the FSB6726 across all primary electrical specifications, including 1.5 A collector current and 500 mW power dissipation. The extended operating temperature range (-65°C to 150°C) provides additional margin for low-temperature environments. This part carries ROHS3 compliance and is suitable for applications requiring the full electrical capability of the original device.

Compliance Considerations: Both substitute parts maintain REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity rating, matching the original FSB6726. The 2STR2230 provides explicit RoHS3 compliance certification, while the NSS30100LT1G also carries RoHS3 compliance. Both parts are suitable for applications subject to environmental and regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the NSS30100LT1G be used in all applications where the FSB6726 was used?

A: The NSS30100LT1G is suitable only for applications where the maximum collector current does not exceed 1 A. If the original design requires the full 1.5 A capability, the 2STR2230 is the appropriate substitute. Thermal design must also be evaluated, as the NSS30100LT1G has reduced power dissipation (310 mW).

Q: What is the primary difference between the NSS30100LT1G and 2STR2230?

A: The NSS30100LT1G operates at 1 A maximum collector current and 310 mW power dissipation. The 2STR2230 operates at 1.5 A maximum collector current and 500 mW power dissipation, matching the FSB6726 specifications. The 2STR2230 also provides an extended low-temperature operating range (-65°C versus -55°C).

Q: Are both substitute parts available in the same package as the FSB6726?

A: Yes. Both the NSS30100LT1G and 2STR2230 are packaged in SOT-23-3 (TO-236-3, SC-59), identical to the FSB6726. Pin configuration and mechanical dimensions are compatible with existing PCB layouts.

Q: Do the substitute parts meet the same environmental and compliance standards?

A: Both substitute parts maintain REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity rating. Both carry RoHS3 compliance certification. All three parts operate across the -55°C to 150°C temperature range, with the 2STR2230 extending to -65°C.

Q: Which substitute part should be selected for new designs?

A: For new designs, the 2STR2230 is recommended when full 1.5 A collector current capability is required. The NSS30100LT1G is suitable for designs with collector current limited to 1 A or less. Both parts are active products with established supply chains and long-term availability.

Q: What is the significance of the transition frequency specification?

A: Both substitute parts specify 100 MHz transition frequency, indicating enhanced high-frequency performance compared to the FSB6726 (transition frequency not specified). This provides additional margin for switching applications and RF circuits.