CMPT5401E BK Equivalent & Substitute Parts

Part Overview

The CMPT5401E BK is a Surface Mount PNP Bipolar Junction Transistor manufactured by Central Semiconductor Corp, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 600 mA, collector-emitter breakdown voltage of 220 V, and a transition frequency of 300 MHz in a compact SOT-23 package.

The CMPT5401E BK is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems and applications.

Substiute Parts

CMPT5401E BK

Central Semiconductor CorpIn Stock: 842CMPT5401E BK Datasheet

Current PartRFQ

CMPT5401 BK PBFREE

Central Semiconductor CorpIn Stock: 843CMPT5401 BK PBFREE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMPT5401E BK is determined by strict equivalence across the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor Type: PNP configuration
• Maximum Collector Current: 600 mA minimum
• Collector-Emitter Breakdown Voltage: Must support 220 V or higher
• Vce Saturation characteristics: Must meet or exceed performance specifications
• DC Current Gain (hFE): Minimum 100 @ 10 mA, 5 V
• Power Dissipation: 350 mW maximum rating
• Transition Frequency: 300 MHz minimum
• Operating Temperature Range: -65°C to 150°C
• Package: SOT-23 Surface Mount configuration

Substitute Part Identified:

The CMPT5401 BK PBFREE (manufacturer recommended substitute) is classified as a partial electrical equivalent. This part maintains identical collector current (600 mA), power rating (350 mW), transition frequency (300 MHz), operating temperature range (-65°C to 150°C), and package configuration (SOT-23). However, the collector-emitter breakdown voltage is reduced to 150 V, and DC current gain is reduced to 60 @ 10 mA, 5 V. This part is suitable only for applications where the 220 V breakdown voltage specification is not required.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (Voltage-Constrained Applications):

The CMPT5401 BK PBFREE is suitable as a substitute only in applications where the collector-emitter breakdown voltage requirement does not exceed 150 V. This part is currently in active production status and carries ROHS3 compliance certification, providing improved supply chain availability and regulatory alignment compared to the obsolete CMPT5401E BK.

Critical Limitations of the Substitute:

The CMPT5401 BK PBFREE exhibits reduced DC current gain (60 vs. 100 @ 10 mA, 5 V) and significantly higher Vce saturation voltage (500 mV vs. 150 mV @ 5 mA, 50 mA). These parameter reductions may impact circuit performance in applications requiring high current gain or low saturation voltage operation. Applications operating at or near the 220 V breakdown voltage specification cannot use this substitute without circuit redesign.

Compliance and Supply Chain Considerations:

The CMPT5401 BK PBFREE is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1), matching the environmental specifications of the original part. The active product status ensures ongoing availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the CMPT5401 BK PBFREE be used as a direct pin-for-pin replacement for the CMPT5401E BK?

A: Yes, the CMPT5401 BK PBFREE is pin-compatible and uses the identical SOT-23 package configuration. However, electrical performance differs in three key parameters: collector-emitter breakdown voltage (150 V vs. 220 V), DC current gain (60 vs. 100), and Vce saturation voltage (500 mV vs. 150 mV). Substitution is valid only if the application does not require the higher voltage or current gain specifications.

Q: What is the primary reason the CMPT5401E BK is classified as obsolete?

A: The CMPT5401E BK is listed as obsolete by the manufacturer. The CMPT5401 BK PBFREE represents the active production alternative, incorporating lead-free (PBFREE) processing and ROHS3 compliance to meet current regulatory requirements.

Q: Are there any thermal or environmental differences between these parts?

A: Both parts share identical operating temperature ranges (-65°C to 150°C), maximum power dissipation (350 mW), and moisture sensitivity levels (MSL 1, Unlimited). Thermal performance is equivalent under identical operating conditions.

Q: How do the reduced DC current gain and increased Vce saturation affect circuit design?

A: Lower DC current gain (60 vs. 100) requires higher base current to achieve the same collector current. Higher Vce saturation voltage (500 mV vs. 150 mV) increases power dissipation in saturation mode. Applications with tight current gain or saturation voltage margins must be re-evaluated before substitution.

Q: Is the CMPT5401 BK PBFREE suitable for high-voltage applications?

A: The CMPT5401 BK PBFREE is rated for maximum 150 V collector-emitter breakdown voltage. Applications requiring 220 V operation cannot use this substitute without circuit modification or alternative component selection.

Q: What packaging options are available for both parts?

A: Both the CMPT5401E BK and CMPT5401 BK PBFREE are supplied in SOT-23 Surface Mount packages (TO-236-3, SC-59, SOT-23-3 designations). No alternative package options are specified for these parts.