ZTX450-AP Equivalent & Substitute Parts

Part Overview

The ZTX450-AP is a Bipolar (BJT) NPN transistor manufactured by Micro Commercial Co, rated for 45V collector-emitter breakdown voltage and 1A maximum collector current in a Through Hole TO-92 package. This component is classified as obsolete, making identification of suitable substitute parts necessary for ongoing design support and production continuity. The ZTX450-AP delivers 625mW maximum power dissipation with a transition frequency of 150MHz, suitable for general-purpose switching and amplification applications requiring moderate voltage and current ratings.

Substiute Parts

ZTX450-AP

Micro Commercial CoIn Stock: 1184ZTX450-AP Datasheet

Current PartRFQ

PN2222ATA

onsemiIn Stock: 5422PN2222ATA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX450-AP is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor type must be NPN
• Maximum collector current (Ic) must equal or exceed 1A
• Collector-emitter breakdown voltage (VCEO) must equal or exceed 45V
• Maximum power dissipation must equal or exceed 625mW
• DC current gain (hFE) minimum must equal or exceed 100 at specified test conditions
• Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

• Mounting type must be Through Hole
• Package must be TO-92-3 (TO-226AA) with formed leads

Compliance Requirements:

• RoHS3 compliance required
• ECCN classification EAR99

The PN2222ATA meets these substitution criteria with electrical ratings that equal or exceed the ZTX450-AP specifications, while maintaining identical mechanical packaging and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The PN2222ATA from onsemi is a suitable substitute for the obsolete ZTX450-AP based on the following engineering factors:

Compliance and Availability: The PN2222ATA maintains ROHS3 compliance and EAR99 ECCN classification, ensuring regulatory alignment with the original part. The substitute is classified as Active product status with 5400 pieces in stock, providing supply continuity for the obsolete ZTX450-AP.

Electrical Performance: Both parts share identical maximum collector current (1A), maximum power dissipation (625mW), and DC current gain specifications (100 @ 150mA, 10V). The PN2222ATA operates across the same temperature range (-55°C to 150°C), ensuring thermal compatibility in existing designs.

Voltage Rating Consideration: The PN2222ATA is rated for 40V maximum collector-emitter breakdown voltage, compared to the ZTX450-AP rating of 45V. Applications operating at voltages below 40V experience no functional limitation. Applications requiring the full 45V rating require circuit-level voltage margin analysis.

Frequency Performance: The PN2222ATA provides a transition frequency of 300MHz, exceeding the ZTX450-AP specification of 150MHz. This enhanced frequency response does not create incompatibility and may improve performance in switching applications.

Mechanical Compatibility: Both parts utilize identical TO-92-3 Through Hole packaging with formed leads, enabling direct physical substitution without PCB modification.

Frequently Asked Questions (FAQ)

Q: Can the PN2222ATA directly replace the ZTX450-AP in all applications?

A: Direct substitution is valid for applications where the collector-emitter voltage does not exceed 40V. The PN2222ATA meets or exceeds all other electrical specifications of the ZTX450-AP. For circuits operating above 40V, circuit-level voltage margin analysis is required to determine substitution feasibility.

Q: Are the TO-92-3 packages physically identical?

A: Yes. Both the ZTX450-AP and PN2222ATA use TO-92-3 (TO-226AA) packaging with formed leads. Physical board layout and component placement require no modification for substitution.

Q: What is the significance of the higher transition frequency in the PN2222ATA?

A: The PN2222ATA transition frequency of 300MHz exceeds the ZTX450-AP specification of 150MHz. This parameter indicates faster switching capability and does not create incompatibility. Applications benefit from improved high-frequency performance characteristics.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant and classified as EAR99 for export control purposes. No compliance barriers exist for substitution. The PN2222ATA is an active product, ensuring ongoing availability and supply chain stability compared to the obsolete ZTX450-AP.

Q: What is the saturation voltage difference between these parts?

A: The ZTX450-AP specifies 250mV maximum saturation voltage at 15mA base current and 150mA collector current. The PN2222ATA specifies 1V maximum saturation voltage at 50mA base current and 500mA collector current. These measurements occur at different test conditions and do not directly indicate substitution incompatibility. Circuit-level saturation performance depends on actual operating base and collector currents.

Q: Can the PN2222ATA be used in high-temperature applications?

A: Yes. The PN2222ATA operates across the identical temperature range as the ZTX450-AP (-55°C to 150°C junction temperature), supporting high-temperature applications without thermal limitation.