PN4250 Equivalent & Substitute Parts

Part Overview

The PN4250 is a PNP bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 500 mA maximum collector current. The device is packaged in a TO-92-3 through-hole configuration with a maximum power dissipation of 625 mW and operates across a temperature range of -55°C to 150°C.

The PN4250 is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Substiute Parts

PN4250

onsemiIn Stock: 1761PN4250 Datasheet

Current PartRFQ

2N4403BU

Fairchild SemiconductorIn Stock: 697452N4403BU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PN4250 is determined by strict equivalence across the following critical parameters:

• Transistor Type: Must be PNP configuration
• Voltage Rating: Collector-emitter breakdown voltage must be 40 V or greater
• Current Rating: Maximum collector current must be 500 mA or greater
• Power Dissipation: Maximum power rating must be 625 mW or greater
• Package Type: Must be TO-92-3 through-hole configuration
• Operating Temperature: Must support -55°C to 150°C range

The 2N4403BU meets all substitution criteria. It maintains identical voltage and power ratings, exceeds the collector current specification, and shares the same through-hole TO-92-3 package footprint and thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

The 2N4403BU is a direct substitute for the PN4250 based on electrical and mechanical parameter equivalence. The substitute part is manufactured by Fairchild Semiconductor and maintains active product status, ensuring ongoing availability and supply chain support.

Both components are classified under ECCN EAR99 and are REACH unaffected, confirming compliance with export control and environmental regulations. The 2N4403BU exceeds the collector current specification of the PN4250 (600 mA versus 500 mA), providing additional design margin while maintaining identical voltage and power ratings.

The identical TO-92-3 package footprint and through-hole mounting type ensure direct mechanical and electrical compatibility in existing circuit board layouts without modification.

Frequently Asked Questions (FAQ)

Q: Can the 2N4403BU be used as a direct replacement for the PN4250 in existing designs?

A: Yes. The 2N4403BU meets all critical electrical and mechanical parameters required for substitution. Both devices share identical voltage ratings (40 V), power dissipation (625 mW), operating temperature range (-55°C to 150°C), and TO-92-3 package configuration. The 2N4403BU exceeds the collector current specification, providing additional operational margin.

Q: What are the key differences between the PN4250 and 2N4403BU?

A: The primary differences are manufacturer (onsemi versus Fairchild Semiconductor), product status (obsolete versus active), and maximum collector current (500 mA versus 600 mA). The 2N4403BU also specifies a transition frequency of 200 MHz. All other electrical and mechanical parameters are equivalent.

Q: Are there any package or pinout differences between these devices?

A: No. Both the PN4250 and 2N4403BU use the TO-92-3 through-hole package with identical pinout and footprint. No circuit board modifications are required for substitution.

Q: Does the higher collector current rating of the 2N4403BU affect circuit operation?

A: No. A higher maximum collector current rating does not affect circuit operation when the actual operating current remains within the original design specification. The 2N4403BU is rated for 600 mA maximum, which accommodates the PN4250 design requirement of 500 mA and below.

Q: Are both parts compliant with export control and environmental regulations?

A: Yes. Both the PN4250 and 2N4403BU are classified under ECCN EAR99 and are REACH unaffected, confirming compliance with applicable export control and environmental regulations.