CXT5551-TP Equivalent & Substitute Parts

Part Overview

The CXT5551-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications requiring moderate voltage and current handling. This surface mount device operates at 160 V collector-emitter breakdown voltage with a maximum collector current of 600 mA and 500 mW power dissipation. The part is classified as Active product status with full inventory availability. Substitute parts are identified to address packaging preferences, enhanced performance specifications, compliance certifications, or inventory optimization in production environments.

Substiute Parts

CXT5551-TP

Micro Commercial CoIn Stock: 943CXT5551-TP Datasheet

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CXT5551 TR PBFREE

Central Semiconductor CorpIn Stock: 8679CXT5551 TR PBFREE Datasheet

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DXT5551-13

Diodes IncorporatedIn Stock: 35407DXT5551-13 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CXT5551-TP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Transistor Type: NPN
• Collector Current (Max): 600 mA
• Collector-Emitter Breakdown Voltage (Max): 160 V
• Vce Saturation (Max): 200 mV @ 5mA, 50mA
• Collector Cutoff Current (Max): 50 nA
• DC Current Gain (hFE Min): 80
• Package / Case: TO-243AA (SOT-89)
• Mounting Type: Surface Mount

Parameters Permitted to Exceed Specification:

• Power Dissipation (Max): Substitute parts may exceed 500 mW
• Transition Frequency: Substitute parts may exceed 100 MHz
• Operating Temperature Range: Substitute parts may equal or exceed the specified range

The identified substitute parts CXT5551 TR PBFREE and DXT5551-13 satisfy all mandatory matching parameters while offering enhanced power dissipation and frequency performance. Both parts maintain the same electrical characteristics at the specified test conditions and package form factor.

Parameter Comparison

Engineering Selection Recommendations

CXT5551 TR PBFREE (Central Semiconductor Corp)

This substitute part maintains full electrical equivalence to the CXT5551-TP across all critical parameters. The part offers enhanced power dissipation capability (1.2 W versus 500 mW) and increased transition frequency (300 MHz versus 100 MHz), providing design margin for thermal and frequency performance. The part is ROHS3 compliant with MSL rating of 1 (Unlimited), indicating superior moisture handling characteristics. Packaging is supplied in Tape & Reel format, suitable for automated assembly processes. Operating temperature range matches the main part specification (-65 to 150 °C). Selection of this substitute is appropriate when RoHS compliance and enhanced performance specifications are required.

DXT5551-13 (Diodes Incorporated)

This substitute part satisfies all mandatory electrical equivalence criteria with identical collector current, breakdown voltage, saturation voltage, and current gain specifications. The part provides enhanced power dissipation (1 W versus 500 mW) and transition frequency (300 MHz versus 100 MHz). ROHS3 compliance and MSL rating of 1 (Unlimited) are provided. The operating temperature range is -55 to 150 °C, which is narrower at the lower bound by 10 °C compared to the main part. Packaging is supplied in Tape & Reel format with SOT-89-3 designation. Selection of this substitute is appropriate when enhanced performance and RoHS compliance are required, provided the minimum operating temperature of -55 °C is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can CXT5551 TR PBFREE be used as a direct replacement for CXT5551-TP in all applications?

A: Yes. Both parts are electrically equivalent across all critical parameters: 600 mA collector current, 160 V breakdown voltage, 200 mV saturation voltage, 50 nA cutoff current, and 80 minimum current gain. The substitute part offers enhanced power dissipation and frequency performance, which do not restrict compatibility. Packaging format differs (Tape & Reel versus Bulk), which affects procurement and assembly processes but not electrical function.

Q: What is the difference between CXT5551 TR PBFREE and DXT5551-13?

A: Both parts meet the electrical specifications of the CXT5551-TP. The primary differences are: (1) Manufacturer: Central Semiconductor Corp versus Diodes Incorporated; (2) Power dissipation: 1.2 W versus 1 W; (3) Operating temperature minimum: -65 °C versus -55 °C; (4) Supplier device package designation: SOT-89 versus SOT-89-3. All other electrical parameters are identical.

Q: Does the operating temperature range difference between DXT5551-13 and CXT5551-TP affect substitution?

A: The DXT5551-13 specifies a minimum operating temperature of -55 °C, which is 10 °C higher than the CXT5551-TP minimum of -65 °C. Substitution is valid only if the application does not require operation below -55 °C. If the circuit must function at temperatures below -55 °C, the DXT5551-13 is not suitable.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both CXT5551 TR PBFREE and DXT5551-13 are ROHS3 compliant. The main part CXT5551-TP does not specify RoHS status. If RoHS compliance is a requirement, either substitute part is appropriate.

Q: What does MSL rating 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life without moisture bake-out requirements. Both substitute parts carry this rating, providing superior moisture handling compared to higher MSL ratings. This is beneficial for long-term storage and supply chain management.

Q: Can I use DXT5551-13 if my application requires operation at -65 °C?

A: No. The DXT5551-13 is specified for operation only down to -55 °C. Use of this part at -65 °C is outside the manufacturer's specified operating range. For applications requiring -65 °C operation, use CXT5551-TP or CXT5551 TR PBFREE.

Q: What is the significance of the enhanced power dissipation in the substitute parts?

A: The substitute parts specify higher maximum power dissipation (1.2 W and 1 W versus 500 mW). This provides additional thermal margin in the circuit design. However, the actual power dissipation in the application is determined by circuit conditions, not the part rating. The higher rating does not change circuit behavior but allows operation in higher-power applications.

Q: What is the significance of the 300 MHz transition frequency in the substitute parts?

A: The substitute parts specify 300 MHz transition frequency compared to 100 MHz for the main part. This indicates faster switching capability. For applications operating at or below 100 MHz, this difference has no functional impact. For higher-frequency applications, the substitute parts provide additional performance margin.

Q: Does packaging format (Bulk versus Tape & Reel) affect electrical performance?

A: No. Packaging format affects procurement, storage, and assembly processes but does not alter electrical characteristics or performance. Both formats contain identical components; the difference is in delivery and handling method.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-243AA package (SOT-89 or SOT-89-3 designation), which is a three-pin surface mount package. Pin configuration and footprint are compatible for direct substitution on the printed circuit board.