2N4403RL Equivalent & Substitute Parts

Part Overview

The 2N4403RL 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-226-3) configuration and is designed for general-purpose switching and amplification applications. The 2N4403RL is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. Direct substitutes with active product status are available from the same manufacturer base product line (2N4403), offering identical electrical performance with improved availability and compliance certifications.

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 (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the 2N4403RL is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor Type: PNP
Voltage - Collector Emitter Breakdown (Max): 40 V
Current - Collector (Ic) (Max): 600 mA
Power - Max: 625 mW (or 600 mW minimum)
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°C to 150°C (TJ)

Mechanical Equivalence Criteria:

Mounting Type: Through Hole
Package / Case: TO-226-3 or TO-92-3 (Formed Leads)

All substitute parts listed below meet these criteria without exception. Substitutes are grouped into two categories: Direct Manufacturer Substitutes (onsemi 2N4403 variants) and Similar Manufacturer Substitutes (alternative manufacturers).

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency	hFE (Min)	Package	RoHS Status
2N4403RL	onsemi	Obsolete	600 mA	40 V	625 mW	200 MHz	100 @ 150mA, 2V	TO-92-3	RoHS non-compliant
2N4403TA	onsemi	Active	600 mA	40 V	625 mW	200 MHz	100 @ 150mA, 2V	TO-92-3	ROHS3 Compliant
2N4403TAR	onsemi	Active	600 mA	40 V	625 mW	200 MHz	100 @ 150mA, 2V	TO-92-3	ROHS3 Compliant
2N4403TF	onsemi	Active	600 mA	40 V	625 mW	200 MHz	100 @ 150mA, 2V	TO-92-3	ROHS3 Compliant
2N4403TFR	onsemi	Active	600 mA	40 V	625 mW	200 MHz	100 @ 150mA, 2V	TO-92-3	ROHS3 Compliant
2N4403-AP	Micro Commercial Co	Obsolete	600 mA	40 V	600 mW	200 MHz	100 @ 150mA, 2V	TO-92-3	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (onsemi 2N4403 Series - Active Status):

The onsemi variants 2N4403TA, 2N4403TAR, 2N4403TF, and 2N4403TFR are direct electrical and mechanical equivalents to the 2N4403RL. All four parts are classified as Active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. These parts are differentiated by packaging format (Cut Tape) and inventory levels:

2N4403TA: 60,100 units in stock. Highest inventory availability.
2N4403TAR: 20,400 units in stock. Reel packaging variant.
2N4403TFR: 2,300 units in stock. Tape and reel format.
2N4403TF: 1,500 units in stock. Cut tape format.

For new designs and ongoing production, selection from these four onsemi variants is recommended due to active product status and ROHS3 compliance certification.

Secondary Substitute (Micro Commercial Co 2N4403-AP - Obsolete Status):

The 2N4403-AP from Micro Commercial Co meets all electrical and mechanical equivalence criteria with maximum power rating of 600 mW (versus 625 mW for onsemi variants). This part is classified as Obsolete and carries ROHS3 compliance. Due to obsolete status, this part is suitable only for legacy system maintenance or where existing inventory is available.

Compliance and Certification:

All active substitute parts (2N4403TA, 2N4403TAR, 2N4403TF, 2N4403TFR) carry ROHS3 compliance certification and REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

Frequently Asked Questions (FAQ)

Q: Can 2N4403TA be used as a direct replacement for 2N4403RL?

A: Yes. The 2N4403TA is electrically and mechanically equivalent to the 2N4403RL. Both devices share identical maximum ratings for collector current (600 mA), collector-emitter breakdown voltage (40 V), power dissipation (625 mW), transition frequency (200 MHz), and DC current gain specifications. Both are packaged in TO-92-3 Through Hole configuration. The primary difference is product status: 2N4403TA is Active with ROHS3 compliance, while 2N4403RL is Obsolete.

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

A: All four parts are electrically identical and meet the same performance specifications. The differences are in packaging format and tape/reel configuration used for automated assembly. TA and TAR variants use one tape format, while TF and TFR variants use another. Selection between these variants depends on assembly equipment compatibility and procurement requirements. Electrical performance is identical across all four.

Q: Why is the 2N4403RL classified as Obsolete?

A: The 2N4403RL is an older variant of the 2N4403 base product line. onsemi has transitioned production to newer variants (2N4403TA, 2N4403TAR, 2N4403TF, 2N4403TFR) that maintain identical electrical specifications while offering improved compliance certifications (ROHS3) and better long-term availability. The obsolete classification indicates that onsemi no longer manufactures this specific variant.

Q: Can I use 2N4403-AP as a substitute?

A: The 2N4403-AP meets all electrical and mechanical equivalence criteria and is a valid substitute. However, this part is classified as Obsolete by Micro Commercial Co. Use of 2N4403-AP is appropriate only for legacy system maintenance where existing inventory is available. For new designs, selection of active onsemi variants (2N4403TA, 2N4403TAR, 2N4403TF, or 2N4403TFR) is recommended.

Q: Are there any differences in operating temperature range between the main part and substitutes?

A: No. All listed parts, including the 2N4403RL and all substitute variants, operate across the identical temperature range of -55°C to 150°C (TJ).

Q: What is the significance of ROHS3 compliance on the substitute parts?

A: ROHS3 compliance indicates that the substitute parts meet current Restriction of Hazardous Substances regulations, restricting the use of specific hazardous materials in electrical and electronic equipment. The 2N4403RL is RoHS non-compliant, while all active substitute variants (2N4403TA, 2N4403TAR, 2N4403TF, 2N4403TFR) are ROHS3 compliant. This certification is required for procurement in many regulated industries and markets.

Q: Is the TO-92-3 package identical across all substitute parts?

A: Yes. All substitute parts use the TO-226-3 or TO-92-3 Through Hole package with formed leads. The physical dimensions and pin configuration are identical, allowing direct pin-for-pin replacement on printed circuit boards designed for the 2N4403RL.

Q: What inventory levels are available for each substitute?

A: Current inventory levels are: 2N4403TA (60,100 units), 2N4403TAR (20,400 units), 2N4403TFR (2,300 units), and 2N4403TF (1,500 units). These levels reflect active production and distribution. For procurement planning, 2N4403TA offers the highest availability.

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