PN3569 NPN Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The PN3569 is an NPN bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 500 mA maximum collector current in a TO-92-3 through-hole package. The device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	625	mW
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-92-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution eligibility for the PN3569 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown rating must be ≥40 V
Current - Collector (Ic) maximum rating must be ≥500 mA
Power dissipation maximum must be ≥625 mW
Operating temperature range must encompass or exceed -55°C to 150°C

Mechanical Compatibility Requirements:

Package type must be TO-92-3 (TO-226-3)
Mounting type must be Through Hole

The substitute parts identified below satisfy these criteria and are classified as either direct equivalents (matching all primary electrical specifications) or upgrades (exceeding minimum specifications while maintaining backward compatibility).

Parameter Comparison

Parameter	PN3569 (Main)	2N4401BU	2N4424 PBFREE	Unit
Manufacturer	onsemi	onsemi	Central Semiconductor Corp	—
Product Status	Obsolete	Active	Active	—
Transistor Type	NPN	NPN	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	40	40	V
Current - Collector (Ic) (Max)	500	600	500	mA
Power - Max	625	625	625	mW
Operating Temperature (Min)	-55	-55	-65	°C
Operating Temperature (Max)	150	150	150	°C
Package / Case	TO-92-3	TO-92-3	TO-92-3	—
Mounting Type	Through Hole	Through Hole	Through Hole	—
Frequency - Transition	—	250	—	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 1V	100 @ 150mA, 1V	180 @ 2mA, 4.5V	—
Vce Saturation (Max)	250mV @ 15mA, 150mA	750mV @ 50mA, 500mA	300mV @ 3mA, 50mA	—
Current - Collector Cutoff (Max)	50nA	—	30nA	—

Engineering Selection Recommendations

2N4401BU (onsemi): The 2N4401BU is an active product offering electrical equivalence to the PN3569 with enhanced collector current capability (600 mA versus 500 mA). This part maintains identical voltage and power ratings, matching operating temperature range, and identical DC current gain specification. The 2N4401BU includes transition frequency specification (250 MHz) not provided for the PN3569. This substitute is suitable for direct replacement in applications where the additional current margin provides design flexibility. RoHS3 compliance status is confirmed.

2N4424 PBFREE (Central Semiconductor Corp): The 2N4424 PBFREE is an active product providing electrical equivalence with identical collector current and power ratings to the PN3569. This part extends the minimum operating temperature to -65°C, providing enhanced low-temperature performance. The device demonstrates improved DC current gain (180 @ 2mA, 4.5V) and lower collector cutoff current (30 nA versus 50 nA). RoHS3 compliance and lead-free construction are confirmed. This substitute is suitable for applications requiring extended temperature range or improved leakage characteristics.

Both substitute parts satisfy all mandatory electrical and mechanical compatibility criteria and are available in active production status.

Frequently Asked Questions (FAQ)

Q: Can the 2N4401BU replace the PN3569 in existing designs? A: Yes. The 2N4401BU maintains identical voltage rating (40 V), power dissipation (625 mW), operating temperature range (-55°C to 150°C), and package configuration (TO-92-3). The higher collector current rating (600 mA) provides additional design margin without affecting circuit operation.

Q: What is the primary difference between the 2N4401BU and 2N4424 PBFREE? A: Both parts are electrically compatible with the PN3569. The 2N4424 PBFREE offers extended minimum operating temperature (-65°C versus -55°C), improved DC current gain characteristics, and lower collector cutoff current. The 2N4401BU provides higher collector current capability (600 mA) and includes transition frequency specification.

Q: Are both substitute parts RoHS compliant? A: Yes. The 2N4401BU carries RoHS3 compliance certification. The 2N4424 PBFREE is RoHS3 compliant with lead-free construction.

Q: Can these parts be used interchangeably in PCB designs? A: Yes. All three parts (PN3569, 2N4401BU, and 2N4424 PBFREE) use identical TO-92-3 through-hole packaging with matching pin configurations, allowing direct mechanical and electrical substitution without PCB modification.

Q: Which substitute should be selected for new designs? A: For new designs, either active substitute is acceptable. The 2N4401BU is recommended where higher collector current margin is beneficial. The 2N4424 PBFREE is recommended where extended low-temperature operation or improved leakage performance is required.

Q: What is the REACH compliance status of these parts? A: All three parts (PN3569, 2N4401BU, and 2N4424 PBFREE) carry REACH Unaffected status.

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