CMPT5551E TR Equivalent & Substitute Parts

Part Overview

The CMPT5551E TR is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, designed for surface mount applications in the SOT-23 package. This device operates at maximum collector-emitter breakdown voltage of 220 V with collector current capability of 600 mA and maximum power dissipation of 350 mW. The CMPT5551E TR is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement continuity.

Substiute Parts

CMPT5551E TR

Central Semiconductor CorpIn Stock: 863CMPT5551E TR Datasheet

Current PartRFQ

CMPT5551 TR PBFREE

Central Semiconductor CorpIn Stock: 6322CMPT5551 TR PBFREE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMPT5551E TR is determined by electrical and mechanical compatibility within the following parameters:

Electrical Compatibility Criteria:

• Transistor type must remain NPN
• Collector current (Ic) maximum must equal or exceed 600 mA
• Voltage - Collector Emitter Breakdown must equal or exceed 220 V
• Power dissipation maximum must equal or exceed 350 mW
• Frequency - Transition must equal or exceed 300 MHz
• Operating temperature range must encompass -65°C to 150°C

Mechanical Compatibility Criteria:

• Mounting type must be Surface Mount
• Package must be SOT-23 (TO-236-3, SC-59, SOT-23-3)
• Moisture Sensitivity Level must be 1 (Unlimited)

The CMPT5551 TR PBFREE is identified as a manufacturer-recommended substitute. However, this part exhibits reduced maximum collector-emitter breakdown voltage (160 V versus 220 V) and reduced minimum DC current gain (80 versus 120 at specified conditions). These reductions indicate this substitute is suitable only for applications where the lower voltage and gain specifications are acceptable.

Parameter Comparison

Engineering Selection Recommendations

The CMPT5551E TR is classified as obsolete. The CMPT5551 TR PBFREE is the manufacturer-recommended active substitute and is ROHS3 compliant, providing enhanced regulatory compliance for new designs and procurement.

Substitution Applicability:

The CMPT5551 TR PBFREE is electrically compatible with the CMPT5551E TR for applications where the following conditions are met:

• Maximum operating collector-emitter voltage does not exceed 160 V
• DC current gain requirement does not exceed 80 at 10 mA collector current and 5 V collector-emitter voltage
• Saturation voltage specification can tolerate 200 mV at 5 mA base current and 50 mA collector current

For applications requiring the full 220 V collector-emitter breakdown voltage or minimum DC current gain of 120, the CMPT5551 TR PBFREE does not provide equivalent electrical performance and alternative components must be evaluated.

Both parts share identical mechanical compatibility: SOT-23 surface mount package, 350 mW power dissipation, 300 MHz transition frequency, and -65°C to 150°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the CMPT5551 TR PBFREE directly replace the CMPT5551E TR in all applications?

A: No. The substitute part has reduced maximum collector-emitter breakdown voltage (160 V versus 220 V) and reduced minimum DC current gain (80 versus 120). Direct substitution is valid only for circuits designed to operate within these lower specifications.

Q: What is the primary reason for substitution?

A: The CMPT5551E TR is obsolete. The CMPT5551 TR PBFREE is the active equivalent from the same manufacturer, ensuring continued availability and supply chain continuity.

Q: Are the packages physically identical?

A: Yes. Both parts use the SOT-23-3 surface mount package (also designated TO-236-3 or SC-59). No PCB layout modifications are required for mechanical compatibility.

Q: Does the substitute part meet RoHS requirements?

A: Yes. The CMPT5551 TR PBFREE is ROHS3 compliant, whereas the original part does not specify RoHS status. This represents an improvement for regulatory compliance in new designs.

Q: What are the key electrical differences?

A: The substitute exhibits two primary electrical differences: (1) Collector-emitter breakdown voltage is reduced from 220 V to 160 V, and (2) Minimum DC current gain is reduced from 120 to 80 at 10 mA collector current and 5 V collector-emitter voltage. Saturation voltage also increases from 100 mV to 200 mV under specified conditions.

Q: Are moisture sensitivity and operating temperature range identical?

A: Yes. Both parts have MSL rating of 1 (Unlimited) and identical operating temperature range of -65°C to 150°C (junction temperature).

Q: What should be verified before implementing this substitution?

A: Circuit design margins for collector-emitter voltage and DC current gain must be confirmed. If the original design operates at or near 220 V or requires minimum gain of 120, the reduced specifications of the substitute may cause circuit malfunction.