2N5401BU Equivalent & Substitute Parts

Part Overview

The 2N5401BU is a PNP bipolar junction transistor (BJT) manufactured by onsemi, housed in a TO-92-3 through-hole package. This device is rated for 150 V collector-emitter breakdown voltage with a maximum collector current of 600 mA and power dissipation of 625 mW. The 2N5401BU is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance where this component is specified.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector-Emitter Breakdown Voltage (Max)	150	V
Collector Current (Max)	600	mA
Power Dissipation (Max)	625	mW
DC Current Gain (hFE Min) @ Ic, Vce	60 @ 10mA, 5V	—
Transition Frequency	400	MHz
Vce Saturation (Max)	500mV @ 5mA, 50mA	—
Operating Temperature Range	-55 to 150	°C
Package Type	TO-92-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the 2N5401BU is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor polarity: PNP
Collector-emitter breakdown voltage: 150 V (maximum)
Maximum collector current: 600 mA
Maximum power dissipation: 625 mW
DC current gain (hFE): minimum 60 at specified test conditions
Transition frequency: 400 MHz
Vce saturation: 500 mV at specified bias conditions

Mechanical Equivalence Criteria:

Package designation: TO-92-3 (TO-226-3, TO-226AA)
Mounting configuration: Through-hole
Pin compatibility: Three-terminal configuration

The 2N5401YBU meets all electrical and mechanical equivalence criteria and shares the same base product number (2N5401), confirming direct substitutability within the specified parameter envelope.

Parameter Comparison

Parameter	2N5401BU	2N5401YBU	Match
Transistor Type	PNP	PNP	✓
Collector-Emitter Breakdown Voltage (Max)	150 V	150 V	✓
Collector Current (Max)	600 mA	600 mA	✓
Power Dissipation (Max)	625 mW	625 mW	✓
DC Current Gain (hFE Min) @ Ic, Vce	60 @ 10mA, 5V	60 @ 10mA, 5V	✓
Transition Frequency	400 MHz	400 MHz	✓
Vce Saturation (Max)	500mV @ 5mA, 50mA	500mV @ 5mA, 50mA	✓
Operating Temperature Range	-55 to 150°C	-55 to 150°C	✓
Package Type	TO-92-3	TO-92-3	✓
Mounting Type	Through Hole	Through Hole	✓
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The 2N5401YBU is a direct electrical and mechanical equivalent to the 2N5401BU. Both devices share identical electrical specifications across all critical parameters: voltage rating, current capacity, power dissipation, gain characteristics, and frequency response. Both are housed in the TO-92-3 through-hole package with identical pin configuration.

The primary distinction between these parts is product status: the 2N5401BU is classified as obsolete, while the 2N5401YBU maintains active product status. The 2N5401YBU is ROHS3 compliant, whereas the 2N5401BU does not specify RoHS compliance. Both devices carry REACH Unaffected status and EAR99 export classification.

For new designs or system maintenance requiring this device class, the 2N5401YBU is the appropriate selection due to its active availability and regulatory compliance. For legacy system repairs where the original 2N5401BU is specified, the 2N5401YBU provides complete functional and physical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 2N5401YBU replace the 2N5401BU in existing circuit designs?

A: Yes. The 2N5401YBU is electrically and mechanically equivalent to the 2N5401BU across all specified parameters. Both devices have identical voltage ratings, current capacity, power dissipation, gain characteristics, and package configuration. Direct substitution is supported without circuit modification.

Q: What is the significance of the product status difference between these parts?

A: The 2N5401BU is classified as obsolete, indicating it is no longer in active production. The 2N5401YBU maintains active product status, ensuring continued availability and supply chain support. For new applications, the active part is the preferred selection.

Q: Are there any compliance or certification differences between these parts?

A: The 2N5401YBU is ROHS3 compliant, while the 2N5401BU does not specify RoHS compliance. Both parts are REACH Unaffected and carry EAR99 export classification. If RoHS compliance is a design requirement, the 2N5401YBU is the appropriate choice.

Q: Are the packages physically identical?

A: Yes. Both the 2N5401BU and 2N5401YBU use the TO-92-3 (TO-226-3, TO-226AA) through-hole package. Pin configuration, lead spacing, and mounting requirements are identical. No PCB layout modifications are required for substitution.

Q: What parameters determine substitutability for this device class?

A: Substitutability is determined by equivalence in transistor polarity (PNP), collector-emitter breakdown voltage (150 V), maximum collector current (600 mA), power dissipation (625 mW), DC current gain (60 minimum at specified conditions), transition frequency (400 MHz), saturation voltage characteristics, operating temperature range, and package type (TO-92-3 through-hole). All these parameters must match for direct substitution.

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