2N4403RLRAG Equivalent & Substitute Parts

Part Overview

The 2N4403RLRAG 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 Through Hole TO-92 (TO-226) configuration and is designed for general-purpose switching and amplification applications. The 2N4403RLRAG is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Direct substitutes from the same manufacturer base product line (2N4403) are available in active product status with identical electrical specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	600	mA
Power - Max	625	mW
Frequency - Transition	200	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 2V	—
Vce Saturation (Max) @ Ib, Ic	750mV @ 50mA, 500mA	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the 2N4403RLRAG is determined by matching the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

Transistor polarity: PNP
Voltage - Collector Emitter Breakdown (Max): 40 V minimum
Current - Collector (Ic) (Max): 600 mA minimum
Power - Max: 625 mW minimum
Frequency - Transition: 200 MHz minimum
DC Current Gain (hFE) (Min): 100 minimum at specified conditions
Vce Saturation: 750 mV maximum at 50 mA base current, 500 mA collector current

Mechanical Matching Criteria:

Mounting Type: Through Hole
Package / Case: TO-92-3 or TO-226-3 compatible

Substitute parts are classified into two categories:

Direct Substitutes (Identical Electrical Specifications): Parts from the 2N4403 base product line manufactured by onsemi with active product status. These devices meet or exceed all electrical parameters of the 2N4403RLRAG and are pin-compatible in TO-92-3 packaging.

Similar Substitutes (Reduced Current Rating): Parts with lower maximum collector current (100 mA or 200 mA) or reduced power dissipation. These are suitable only for applications where the full 600 mA current capability is not required. Similar substitutes include BC557 series devices and 2N3906 variants.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency (Transition) MHz	hFE (Min)	Package
2N4403RLRAG	onsemi	Obsolete	600	40	625	200	100	TO-92-3
2N4403TA	onsemi	Active	600	40	625	200	100	TO-92-3
2N4403TAR	onsemi	Active	600	40	625	200	100	TO-92-3
2N4403TF	onsemi	Active	600	40	625	200	100	TO-92-3
2N4403TFR	onsemi	Active	600	40	625	200	100	TO-92-3
2N4403-AP	Micro Commercial Co	Obsolete	Not Specified	40	600	200	100	TO-92-3
2N3906-AP	Micro Commercial Co	Obsolete	200	40	600	250	100	TO-92-3
BC557BTF	onsemi	Active	100	45	500	150	200	TO-92-3
BC557ATA	Fairchild Semiconductor	Active	100	45	500	150	110	TO-92-3

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

The 2N4403TA, 2N4403TAR, 2N4403TF, and 2N4403TFR are direct electrical and mechanical equivalents of the 2N4403RLRAG. All four parts are manufactured by onsemi, carry active product status, and meet identical electrical specifications. These devices are ROHS3 compliant and REACH unaffected. Selection among these four variants is determined by packaging format and inventory availability:

2N4403TA: Cut Tape packaging, 60,100 units in stock
2N4403TAR: Cut Tape packaging, 20,400 units in stock
2N4403TF: Cut Tape packaging, 1,500 units in stock
2N4403TFR: Cut Tape packaging, 2,300 units in stock

All four parts are suitable for direct pin-for-pin replacement in applications currently using the 2N4403RLRAG.

Secondary Substitutes (Reduced Current Applications):

The 2N3906-AP and 2N4403-AP are obsolete variants from alternative manufacturers. The 2N3906-AP provides 200 mA maximum collector current and 250 MHz transition frequency, suitable only for applications not requiring the full 600 mA capability of the primary device.

The BC557BTF and BC557ATA are active PNP transistors with reduced maximum collector current (100 mA) and lower power dissipation (500 mW). These devices are suitable only for low-current signal applications and are not recommended for applications requiring 600 mA collector current.

Frequently Asked Questions (FAQ)

Q: Can the 2N4403TA be used as a direct replacement for the 2N4403RLRAG?

A: Yes. The 2N4403TA is a direct electrical and mechanical equivalent. Both devices are PNP transistors with identical ratings: 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, 625 mW power dissipation, and 200 MHz transition frequency. The 2N4403TA is in active product status and is ROHS3 compliant, making it the recommended replacement for the obsolete 2N4403RLRAG.

Q: What is the difference between 2N4403TA, 2N4403TAR, 2N4403TF, and 2N4403TFR?

A: All four parts are electrically identical and manufactured by onsemi. The differences are in packaging format (all are Cut Tape) and inventory availability. The suffixes (TA, TAR, TF, TFR) indicate different tape and reel configurations used for automated assembly. Selection should be based on procurement requirements and available inventory.

Q: Can the BC557BTF replace the 2N4403RLRAG in all applications?

A: No. The BC557BTF has a maximum collector current of 100 mA, compared to 600 mA for the 2N4403RLRAG. The BC557BTF is suitable only for applications requiring less than 100 mA collector current. Applications requiring the full 600 mA capability must use the 2N4403 series devices.

Q: Are the 2N4403 series devices RoHS compliant?

A: The active 2N4403 variants (2N4403TA, 2N4403TAR, 2N4403TF, 2N4403TFR) are ROHS3 compliant. The obsolete 2N4403RLRAG does not specify RoHS status. All active substitutes meet current environmental compliance requirements.

Q: What is the operating temperature range for substitute parts?

A: The 2N4403 series devices operate from -55°C to 150°C junction temperature. The BC557 series devices operate to 150°C junction temperature. All devices support the full industrial temperature range required for most applications.

Q: Are the substitute parts available in the same TO-92-3 package?

A: Yes. All recommended substitute parts (2N4403TA, 2N4403TAR, 2N4403TF, 2N4403TFR) are packaged in TO-92-3 (TO-226-3) configuration with formed leads, providing mechanical compatibility with the original 2N4403RLRAG. Pin configuration is identical.

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