2N4401RLRPG Equivalent & Substitute Parts

Part Overview

The 2N4401RLRPG is an NPN bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 600 mA maximum collector current. This device is designed for small-signal switching and amplification applications in the TO-92 through-hole package. The 2N4401RLRPG is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Direct substitutes with active product status and improved availability are available from onsemi and other manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	600	mA
Vce Saturation (Max) @ Ib, Ic	750 mV @ 50 mA, 500 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150 mA, 1 V	—
Power - Max	625	mW
Frequency - Transition	250	MHz
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3	—

Substitute Part Grouping Explanation

Substitute parts for the 2N4401RLRPG are classified into two categories based on electrical parameter compatibility:

Direct Substitutes (Identical Electrical Parameters): Direct substitutes maintain all critical electrical specifications: 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, 750 mV Vce saturation at specified conditions, 100 minimum DC current gain, 625 mW maximum power dissipation, and 250 MHz transition frequency. These parts are pin-compatible in TO-92-3 packaging and require no circuit modifications. Direct substitutes include 2N4401TA, 2N4401TAR, 2N4401TF, and 2N4401TFR from onsemi and Fairchild Semiconductor.

Similar Substitutes (Modified Electrical Parameters): Similar substitutes maintain the same collector current (600 mA), power dissipation (625 mW), and TO-92-3 package compatibility but differ in one or more electrical specifications. These parts are suitable for applications where the parameter differences do not impact circuit performance. Similar substitutes include KSP2222ATA (40 V, 300 MHz transition frequency), PN2222TA (30 V collector-emitter breakdown, 300 MHz transition frequency), PN2222TF (30 V collector-emitter breakdown, 300 MHz transition frequency), and 2N4401-AP (40 V, 600 mW power dissipation).

Parameter Comparison

Part Number	Manufacturer	Product Status	Vce Breakdown (V)	Ic Max (mA)	Power Max (mW)	fT (MHz)	Vce Sat @ 50mA, 500mA (mV)	hFE Min @ 150mA, 1V	Package
2N4401RLRPG	onsemi	Obsolete	40	600	625	250	750	100	TO-92-3
2N4401TA	onsemi	Active	40	600	625	250	750	100	TO-92-3
2N4401TAR	onsemi	Active	40	600	625	250	750	100	TO-92-3
2N4401TF	Fairchild Semiconductor	Active	40	600	625	250	750	100	TO-92-3
2N4401TFR	onsemi	Active	40	600	625	250	750	100	TO-92-3
KSP2222ATA	Fairchild Semiconductor	Active	40	600	625	300	1000	100	TO-92-3
PN2222TA	onsemi	Last Time Buy	30	600	625	300	1000	100	TO-92-3
PN2222TF	Fairchild Semiconductor	Active	30	600	600	300	1000	100	TO-92-3
2N4401-AP	Micro Commercial Co	Obsolete	40	600	600	250	750	100	TO-92-3

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification Required):

Select 2N4401TA, 2N4401TAR, 2N4401TF, or 2N4401TFR for applications requiring identical electrical performance to the 2N4401RLRPG. All four direct substitutes maintain 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, 750 mV Vce saturation, and 250 MHz transition frequency. These parts are available in active product status with higher inventory levels than the obsolete 2N4401RLRPG. onsemi manufactures 2N4401TA (89,662 units), 2N4401TAR (40,100 units), and 2N4401TFR (24,100 units). Fairchild Semiconductor manufactures 2N4401TF (2,100 units). All direct substitutes are RoHS3 compliant and REACH unaffected.

For Applications Tolerant of Parameter Variations:

KSP2222ATA is suitable for applications where increased transition frequency (300 MHz versus 250 MHz) and higher Vce saturation (1000 mV versus 750 mV) are acceptable. This part maintains 40 V collector-emitter breakdown voltage and 600 mA maximum collector current. KSP2222ATA is manufactured by Fairchild Semiconductor with 55,200 units in stock and active product status.

PN2222TA and PN2222TF are suitable only for applications where the reduced collector-emitter breakdown voltage of 30 V is acceptable. These parts maintain 600 mA maximum collector current and offer 300 MHz transition frequency. PN2222TA is classified as Last Time Buy. PN2222TF is active with 64,868 units in stock.

Packaging and Compliance Considerations:

All substitute parts are supplied in TO-92-3 through-hole package with formed leads, maintaining mechanical compatibility with the 2N4401RLRPG. Direct substitutes 2N4401TA, 2N4401TAR, and 2N4401TFR are supplied in Cut Tape (CT) packaging. All active-status parts are RoHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can 2N4401TA be used as a direct replacement for 2N4401RLRPG?

A: Yes. 2N4401TA is a direct substitute with identical electrical specifications: 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, 750 mV Vce saturation at specified conditions, 100 minimum DC current gain, 625 mW maximum power dissipation, and 250 MHz transition frequency. The part is pin-compatible in TO-92-3 packaging and requires no circuit modifications. 2N4401TA is manufactured by onsemi with active product status.

Q: What is the difference between 2N4401TFR and 2N4401TA?

A: Both parts are manufactured by onsemi and maintain identical electrical specifications. The primary difference is packaging: 2N4401TFR is supplied in Cut Tape (CT) packaging, while 2N4401TA is also supplied in Cut Tape (CT) packaging. Both are RoHS3 compliant and REACH unaffected. Selection between these parts depends on procurement and assembly requirements.

Q: Can KSP2222ATA replace 2N4401RLRPG in all applications?

A: KSP2222ATA is not a direct substitute. While it maintains 40 V collector-emitter breakdown voltage and 600 mA maximum collector current, it differs in transition frequency (300 MHz versus 250 MHz) and Vce saturation (1000 mV versus 750 mV). KSP2222ATA is suitable only for applications where these parameter differences do not impact circuit performance. Applications requiring the exact 750 mV Vce saturation or 250 MHz transition frequency must use direct substitutes.

Q: Why is PN2222TA classified as Last Time Buy?

A: PN2222TA is classified as Last Time Buy, indicating that onsemi will discontinue this product. While currently available with 4,556 units in stock, procurement should transition to active alternatives. For applications tolerant of 30 V collector-emitter breakdown voltage, PN2222TF (active status, 64,868 units) is the recommended alternative.

Q: Are all substitute parts RoHS3 compliant?

A: All active-status substitute parts (2N4401TA, 2N4401TAR, 2N4401TF, 2N4401TFR, KSP2222ATA, PN2222TA, and PN2222TF) are RoHS3 compliant. The original 2N4401RLRPG is classified as obsolete and does not have RoHS status specified. All active parts are REACH unaffected.

Q: What is the difference between TO-92 and TO-92-3 packaging?

A: TO-92-3 is the standard three-lead through-hole package for small-signal transistors. All substitute parts are supplied in TO-92-3 (TO-226-3 or TO-226AA) packaging with formed leads, maintaining mechanical compatibility with the 2N4401RLRPG. The 2N4401-AP variant is supplied in TO-92 packaging, which is functionally equivalent for through-hole assembly.

Q: Can 2N4401-AP be used as a substitute for 2N4401RLRPG?

A: 2N4401-AP maintains electrical compatibility with 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, 750 mV Vce saturation, and 250 MHz transition frequency. However, 2N4401-AP is classified as obsolete by Micro Commercial Co, making it unsuitable for new designs or long-term procurement. Active alternatives such as 2N4401TA or 2N4401TFR are recommended.

Q: What inventory levels are available for direct substitutes?

A: Direct substitutes have the following inventory levels: 2N4401TA (89,662 units), 2N4401TAR (40,100 units), 2N4401TFR (24,100 units), and 2N4401TF (2,100 units). The original 2N4401RLRPG has 20,738 units in stock but is classified as obsolete. For long-term procurement, 2N4401TA offers the highest availability.

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