2N4923 PBFREE Equivalent & Substitute Parts

Part Overview

The 2N4923 PBFREE is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, designed for general-purpose switching and amplification applications. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 2N4923 PBFREE operates at maximum collector current of 1 A with a collector-emitter breakdown voltage of 80 V and dissipates up to 30 W of power. Its through-hole TO-126 package and ROHS3 compliance make it suitable for legacy circuit implementations requiring direct replacement options.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	80	V
Power - Max	30	W
Frequency - Transition	3	MHz
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-225AA, TO-126-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 2N4923 PBFREE is determined by strict equivalence of electrical and mechanical parameters. The primary substitute identified is the 2N4923G manufactured by onsemi. This substitution is valid based on the following criteria:

Electrical Parameter Equivalence:

Identical transistor type (NPN)
Identical maximum collector current (1 A)
Identical collector-emitter breakdown voltage (80 V)
Identical maximum power dissipation (30 W)
Identical transition frequency (3 MHz)
Identical operating temperature range (-65°C to 150°C)

Mechanical Parameter Equivalence:

Identical mounting type (Through Hole)
Identical package designation (TO-225AA, TO-126-3)
Identical supplier device package (TO-126)

Compliance Equivalence:

Both devices are ROHS3 compliant
Both devices have REACH Unaffected status
Both devices share identical ECCN and HTSUS classifications

The 2N4923G is an active product with higher inventory availability (5921 pcs) compared to the obsolete 2N4923 PBFREE (973 pcs), making it the direct functional replacement.

Parameter Comparison

Parameter	2N4923 PBFREE (Central Semiconductor)	2N4923G (onsemi)	Match Status
Transistor Type	NPN	NPN	Identical
Current - Collector (Ic) Max	1 A	1 A	Identical
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	Identical
Power - Max	30 W	30 W	Identical
Frequency - Transition	3 MHz	3 MHz	Identical
Operating Temperature Range	-65°C to 150°C (TJ)	-65°C to 150°C (TJ)	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	TO-225AA, TO-126-3	TO-225AA, TO-126-3	Identical
Supplier Device Package	TO-126	TO-126	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The 2N4923G from onsemi is the direct equivalent substitute for the 2N4923 PBFREE. Selection of this substitute is supported by:

Product Status Advantage: The 2N4923G maintains active product status with onsemi, ensuring continued availability and manufacturing support. The original 2N4923 PBFREE is classified as obsolete, making the 2N4923G the appropriate choice for new designs and production continuity.

Compliance Certification: Both devices maintain identical ROHS3 compliance and REACH Unaffected status, ensuring regulatory equivalence for applications subject to environmental and hazardous substance restrictions.

Electrical and Mechanical Equivalence: All specified electrical parameters (current, voltage, power, frequency) and mechanical parameters (package, mounting type) are identical between the two devices, enabling direct pin-for-pin replacement without circuit modification.

Inventory Availability: The 2N4923G demonstrates significantly higher inventory availability (5921 pcs) compared to the obsolete 2N4923 PBFREE, supporting supply chain reliability for production requirements.

Frequently Asked Questions (FAQ)

Q: Can the 2N4923G be used as a direct replacement for the 2N4923 PBFREE in existing circuits?

A: Yes. The 2N4923G is electrically and mechanically equivalent to the 2N4923 PBFREE. All critical parameters including collector current, breakdown voltage, power dissipation, transition frequency, and operating temperature range are identical. The TO-126 package pinout is identical, enabling direct pin-for-pin substitution without circuit modification.

Q: What is the difference between the 2N4923 PBFREE and 2N4923G?

A: The primary differences are manufacturer and product status. The 2N4923 PBFREE is manufactured by Central Semiconductor Corp and is classified as obsolete. The 2N4923G is manufactured by onsemi and maintains active product status. All electrical and mechanical specifications are identical.

Q: Are there any compliance or certification differences between these devices?

A: No. Both the 2N4923 PBFREE and 2N4923G are ROHS3 compliant and have REACH Unaffected status. They share identical ECCN and HTSUS classifications, ensuring regulatory equivalence.

Q: What packaging options are available for the 2N4923G?

A: The 2N4923G is supplied in TO-126 package configuration (TO-225AA, TO-126-3 designations). This matches the through-hole package of the 2N4923 PBFREE.

Q: Is the 2N4923G suitable for new product designs?

A: Yes. The 2N4923G is an active product with established manufacturing and supply chain support. It is appropriate for both legacy circuit support and new product designs requiring NPN transistors with 1 A collector current and 80 V breakdown voltage specifications.

Q: What is the operating temperature range for the 2N4923G?

A: The 2N4923G operates across a junction temperature range of -65°C to 150°C (TJ), identical to the 2N4923 PBFREE.

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