PN3569_D26Z Equivalent & Substitute Parts

Part Overview

The PN3569_D26Z 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. This device is classified as obsolete, indicating discontinued production and limited availability. Substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	40 V
Current - Collector (Ic) (Max)	500 mA
Power - Max	625 mW
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 1V
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	TO-92-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the PN3569_D26Z is determined by electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 40 V (minimum requirement)
DC Current Gain (hFE) (Min) @ Ic, Vce: 100 @ 150mA, 1V
Operating Temperature Range: -55°C ~ 150°C (TJ)
Package / Case: TO-92-3
Mounting Type: Through Hole

Allowable Variations:

Current - Collector (Ic) (Max): Substitute parts rated at 600 mA exceed the original 500 mA specification, providing enhanced current handling capability while maintaining backward compatibility
Power - Max: Substitute parts maintain the 625 mW rating
Frequency - Transition: Substitute parts include 250 MHz specification, not present in the original part

All listed substitute parts meet or exceed the electrical requirements of the PN3569_D26Z while maintaining identical package and mounting specifications.

Parameter Comparison

Parameter	PN3569_D26Z	2N4401TA	2N4401TAR	2N4401TF	2N4401TFR
Manufacturer	onsemi	onsemi	onsemi	Fairchild Semiconductor	onsemi
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	40 V	40 V	40 V
Current - Collector (Ic) (Max)	500 mA	600 mA	600 mA	600 mA	600 mA
Power - Max	625 mW	625 mW	625 mW	625 mW	625 mW
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 1V	100 @ 150mA, 1V	100 @ 150mA, 1V	100 @ 150mA, 1V	100 @ 150mA, 1V
Frequency - Transition	Not specified	250 MHz	250 MHz	250 MHz	250 MHz
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (onsemi Manufactured):

The 2N4401TA, 2N4401TAR, and 2N4401TFR are direct substitutes manufactured by onsemi. These parts are classified as active products with ROHS3 compliance, ensuring long-term availability and regulatory adherence. The 2N4401TFR variant offers the highest inventory availability at 24,100 pieces, followed by 2N4401TAR at 40,100 pieces. Both are supplied in cut tape packaging suitable for automated assembly processes.

Secondary Substitute (Fairchild Semiconductor):

The 2N4401TF, manufactured by Fairchild Semiconductor, provides an alternative source for the 2N4401 base product number. This part maintains electrical and mechanical compatibility with the PN3569_D26Z while offering 2,100 pieces in inventory. Fairchild Semiconductor sourcing introduces supply chain diversification.

Compliance Considerations:

All active substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the regulatory profile of the original PN3569_D26Z. The onsemi variants include ROHS3 compliance certification, supporting modern manufacturing and environmental standards.

Current Rating Enhancement:

Substitute parts are rated for 600 mA maximum collector current, compared to the original 500 mA specification. This 20% increase in current capacity provides design margin without introducing incompatibility, as the substitute parts maintain identical voltage, power, and gain specifications.

Frequently Asked Questions (FAQ)

Q: Can the 2N4401 series parts directly replace the PN3569_D26Z in existing designs?

A: Yes. The 2N4401TA, 2N4401TAR, 2N4401TF, and 2N4401TFR are electrically and mechanically compatible with the PN3569_D26Z. All parts share identical voltage ratings (40 V), DC current gain specifications (100 @ 150mA, 1V), operating temperature range (-55°C to 150°C), and TO-92-3 package configuration. The substitute parts are rated for higher maximum collector current (600 mA versus 500 mA), which does not create incompatibility.

Q: What is the difference between the onsemi and Fairchild Semiconductor 2N4401 variants?

A: The electrical and mechanical specifications are identical across all manufacturers. The primary differences are manufacturing source and inventory availability. onsemi variants (2N4401TA, 2N4401TAR, 2N4401TFR) offer significantly higher inventory levels and ROHS3 compliance certification. The Fairchild Semiconductor 2N4401TF provides an alternative source with 2,100 pieces available.

Q: Are there packaging differences between the substitute parts?

A: All substitute parts use the TO-92-3 through-hole package with formed leads. The 2N4401TA, 2N4401TAR, and 2N4401TFR are supplied in cut tape packaging, suitable for automated pick-and-place assembly. The 2N4401TF packaging specification is not detailed in the provided data. All parts are compatible with standard through-hole PCB layouts.

Q: What does the higher collector current rating (600 mA) mean for circuit design?

A: The substitute parts are rated for 600 mA maximum collector current compared to the original 500 mA. This represents a 20% increase in current handling capability. In applications where the PN3569_D26Z was operating near its 500 mA limit, the substitute parts provide additional design margin. Circuits designed for the original 500 mA specification operate safely with the substitute parts without modification.

Q: Why is the PN3569_D26Z classified as obsolete?

A: The PN3569_D26Z is an older product designation that has been superseded by the 2N4401 series. The 2N4401 family represents the current active product line for this transistor type and specification class. Substitute parts ensure continued availability and support for designs requiring this performance level.

Q: Which substitute part should be selected for new designs?

A: Selection among the active substitute parts depends on supply chain and manufacturing requirements. The 2N4401TFR offers the highest inventory availability (24,100 pieces) and onsemi manufacturing with ROHS3 compliance. The 2N4401TAR provides an alternative onsemi source with 40,100 pieces available. Both are suitable for new production designs.

Q: Are there any frequency or speed differences between the original and substitute parts?

A: The substitute parts specify a transition frequency of 250 MHz, which is not specified for the original PN3569_D26Z. This specification indicates the substitute parts are capable of higher-frequency operation. For applications operating below the specified frequency limits of the original part, this difference does not affect compatibility.

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