SS8050-D-AP Equivalent & Substitute Parts

Part Overview

The SS8050-D-AP is a small-signal NPN bipolar junction transistor manufactured by Micro Commercial Co, rated for 25V collector-emitter breakdown voltage and 1.5A maximum collector current. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The TO-92 through-hole package and 1W power rating make this transistor suitable for general-purpose switching and amplification applications in legacy and new designs requiring compatible pin configurations and electrical characteristics.

Substiute Parts

SS8050-D-AP

Micro Commercial CoIn Stock: 1213SS8050-D-AP Datasheet

Current PartRFQ

SS8050CTA

Fairchild SemiconductorIn Stock: 15676SS8050CTA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS8050-D-AP is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Transistor polarity: NPN configuration required
• Maximum collector current: 1.5A minimum rating
• Collector-emitter breakdown voltage: 25V minimum rating
• Maximum power dissipation: 1W minimum rating
• Package/case: TO-92-3 through-hole configuration with identical pin assignment

Functional Compatibility Criteria:

• DC current gain (hFE) at specified bias conditions
• Saturation voltage characteristics
• Collector cutoff current specifications
• Operating temperature range compatibility

The SS8050CTA manufactured by Fairchild Semiconductor meets all substitution criteria. Both devices share identical maximum ratings for collector current, breakdown voltage, and power dissipation. Both employ the TO-92-3 through-hole package with formed leads, ensuring mechanical and electrical pin compatibility. The transition frequency difference (190MHz vs. 100MHz) does not preclude substitution, as the SS8050CTA operates within acceptable parameters for applications designed for the SS8050-D-AP.

Parameter Comparison

Engineering Selection Recommendations

SS8050CTA Selection Basis:

The SS8050CTA is the primary substitute for the obsolete SS8050-D-AP based on the following engineering factors:

1. Product Status: The SS8050CTA maintains active production status with Fairchild Semiconductor, ensuring long-term availability and supply chain continuity compared to the obsolete SS8050-D-AP.

2. Electrical Equivalence: Both devices share identical maximum ratings across collector current (1.5A), breakdown voltage (25V), power dissipation (1W), and saturation voltage characteristics. These parameters define the operational envelope for switching and amplification circuits.

3. Package Compatibility: Both transistors employ the TO-92-3 through-hole package with formed leads, enabling direct mechanical and electrical substitution without PCB redesign or rework.

4. Compliance Certification: Both parts carry RoHS compliance and identical ECCN/HTSUS classifications, satisfying regulatory and procurement requirements.

5. Functional Margin: The SS8050CTA's lower transition frequency (100MHz vs. 190MHz) and minimum DC current gain (120 vs. 160) represent conservative specifications that maintain compatibility with designs originally specified for the SS8050-D-AP. Applications operating below 100MHz encounter no functional degradation.

Inventory Consideration: The SS8050CTA maintains significantly higher stock levels (15,600 pcs) compared to the SS8050-D-AP (1,188 pcs), supporting procurement reliability for volume production and long-term support.

Frequently Asked Questions (FAQ)

Q: Can the SS8050CTA directly replace the SS8050-D-AP without circuit modification?

A: Yes. Both transistors share identical pin assignments in the TO-92-3 package, identical maximum electrical ratings (1.5A, 25V, 1W), and equivalent saturation voltage characteristics. Direct substitution is supported without circuit redesign.

Q: What is the significance of the transition frequency difference (190MHz vs. 100MHz)?

A: Transition frequency defines the upper frequency limit for linear amplification. The SS8050CTA's 100MHz specification is sufficient for applications originally designed for the SS8050-D-AP. Circuits operating below 100MHz experience no performance change. High-frequency switching applications above 100MHz require circuit-level evaluation.

Q: Are there differences in DC current gain that affect circuit operation?

A: The SS8050CTA specifies a minimum DC current gain (hFE) of 120 at 100mA, 1V, compared to 160 for the SS8050-D-AP. This represents a 25% reduction in gain. For circuits designed with gain margin, this difference is absorbed within normal design tolerances. Circuits with minimal gain margin require bias network recalculation.

Q: Do both transistors support the same operating temperature range?

A: The SS8050-D-AP specifies -55°C to +150°C. The SS8050CTA specification provided indicates operation to +150°C. For applications requiring the full -55°C lower limit, verify the SS8050CTA datasheet for complete temperature range specification.

Q: What is the packaging difference between "Bulk" and the original packaging?

A: The SS8050CTA is supplied in bulk packaging, indicating loose components without tape-and-reel or tube packaging. This affects handling and automated assembly processes but does not alter electrical or mechanical specifications. Confirm packaging compatibility with assembly equipment and procurement workflows.

Q: Are both parts RoHS compliant?

A: Yes. Both the SS8050-D-AP and SS8050CTA carry RoHS compliance certification, satisfying environmental and regulatory requirements for EU and equivalent markets.

Q: Can the SS8050CTA be used in new designs, or only as a replacement for obsolete SS8050-D-AP?

A: The SS8050CTA is suitable for both new designs and obsolescence replacement. Its active production status and established supply chain make it a preferred choice for new development requiring small-signal NPN transistors in the 1.5A, 25V class.