2N4402TA Equivalent & Substitute Parts

Part Overview

The 2N4402TA is a PNP bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 600 mA maximum collector current. This device is packaged in a TO-92-3 through-hole configuration and is classified as obsolete. Due to its obsolete product status, equivalent substitute parts are necessary for continued circuit implementation and design updates. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating modern component availability and compliance requirements.

Substiute Parts

2N4402TA

onsemiIn Stock: 8992N4402TA Datasheet

Current PartRFQ

2N3906-AP

Micro Commercial CoIn Stock: 13742N3906-AP Datasheet

SimilarRFQ

2N4403-AP

Micro Commercial CoIn Stock: 15682N4403-AP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N4402TA is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor Type: PNP (mandatory match)
• Voltage - Collector Emitter Breakdown (Max): 40 V (minimum requirement)
• Package / Case: TO-92-3 through-hole configuration (mechanical compatibility)
• Operating Temperature Range: -55°C to 150°C (functional envelope)

Secondary Compatibility Parameters:

• Current - Collector (Ic) (Max): Substitute must support applications requiring up to 600 mA
• Power - Max: Substitute must dissipate minimum 625 mW
• DC Current Gain (hFE): Substitute must provide sufficient gain for circuit biasing

The identified substitute parts 2N3906-AP and 2N4403-AP meet the primary criteria of PNP type, 40 V breakdown voltage, and TO-92-3 package configuration. However, differences in maximum collector current and power dissipation ratings require application-specific evaluation to ensure functional equivalence within the intended circuit design.

Parameter Comparison

Engineering Selection Recommendations

2N4403-AP Selection: The 2N4403-AP manufactured by Micro Commercial Co provides the closest electrical equivalence to the 2N4402TA. This substitute matches the saturation voltage specification (750mV @ 50mA, 500mA) and DC current gain (100 @ 150mA, 2V), ensuring compatible biasing characteristics. The 2N4403-AP maintains the 40 V breakdown voltage and TO-92-3 package configuration. Both devices share identical operating temperature ranges (-55°C to 150°C). The 2N4403-AP carries ROHS3 compliance certification, meeting modern regulatory requirements. This part is suitable for direct substitution in applications where the 600 mA collector current specification of the 2N4402TA is not exceeded.

2N3906-AP Selection: The 2N3906-AP is applicable only in circuits where maximum collector current does not exceed 200 mA. This substitute provides superior DC current gain (100 @ 10mA, 1V) and lower saturation voltage (400mV @ 5mA, 50mA), making it suitable for low-current signal amplification and switching applications. The 2N3906-AP includes transition frequency specification (250 MHz), enabling use in higher-frequency circuits. ROHS3 compliance and REACH unaffected status align with current regulatory standards. Selection of this part requires confirmation that circuit current demands remain within the 200 mA maximum rating.

Compliance Considerations: Both substitute parts maintain REACH unaffected status and carry ROHS3 compliance, satisfying environmental and regulatory requirements. The 2N4402TA, while REACH unaffected, lacks specified RoHS status due to its obsolete classification. Modern designs should prioritize the 2N4403-AP or 2N3906-AP to ensure compliance with current manufacturing and supply chain standards.

Frequently Asked Questions (FAQ)

Q: Can the 2N3906-AP directly replace the 2N4402TA in all applications?

A: The 2N3906-AP is not a universal substitute. The 2N3906-AP maximum collector current rating of 200 mA is significantly lower than the 2N4402TA rating of 600 mA. Substitution is valid only in circuits where collector current remains below 200 mA. Applications requiring higher current operation must use the 2N4403-AP.

Q: What is the primary difference between the 2N4403-AP and 2N3906-AP substitutes?

A: The 2N4403-AP supports higher collector current operation and matches the saturation voltage characteristics of the 2N4402TA. The 2N3906-AP is optimized for lower-current applications with superior frequency response (250 MHz transition frequency). Current requirements determine which substitute is appropriate.

Q: Are the substitute parts physically compatible with the 2N4402TA?

A: Yes. Both 2N3906-AP and 2N4403-AP use the TO-92-3 (TO-226AA) through-hole package with formed leads, providing identical mechanical compatibility and PCB footprint compatibility with the 2N4402TA.

Q: Do the substitute parts meet modern compliance standards?

A: Both 2N3906-AP and 2N4403-AP carry ROHS3 compliance certification and REACH unaffected status. The 2N4402TA, classified as obsolete, does not specify RoHS compliance. Modern designs should utilize the compliant substitute parts.

Q: How do the DC current gain specifications affect substitution?

A: The 2N4402TA specifies minimum hFE of 50 @ 150mA, 2V. Both substitutes provide higher minimum gain (100 @ specified conditions), resulting in improved biasing efficiency. Circuits designed for the lower gain of the 2N4402TA will function with enhanced performance using either substitute, provided current ratings are observed.

Q: What operating temperature range applies to the substitute parts?

A: Both 2N3906-AP and 2N4403-AP maintain the identical operating temperature range of -55°C to 150°C (TJ) as the 2N4402TA, ensuring thermal compatibility across all specified applications.

Q: Can saturation voltage differences between substitutes affect circuit performance?

A: Yes. The 2N4403-AP matches the 2N4402TA saturation voltage (750mV @ 50mA, 500mA), while the 2N3906-AP specifies lower saturation voltage (400mV @ 5mA, 50mA). In switching applications, the 2N3906-AP provides lower on-state voltage drop. In linear amplification, the 2N4403-AP maintains closer electrical behavior to the original part.