2N3904RLRPG Equivalent & Substitute Parts

Part Overview

The 2N3904RLRPG is an NPN bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 200 mA maximum collector current. This device is packaged in a TO-92 (TO-226-3) through-hole configuration with a maximum power dissipation of 625 mW and transition frequency of 300 MHz. The part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	200	mA
Power - Max	625	mW
Frequency - Transition	300	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 50mA	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3	—

Substitute Part Grouping Explanation

Substitute parts for the 2N3904RLRPG are identified based on electrical and mechanical parameter equivalence within the NPN bipolar transistor category. The substitution criteria are:

Primary Electrical Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 40 V
Current - Collector (Ic) (Max): 200 mA
DC Current Gain (hFE) (Min): 100 @ 10mA, 1V
Operating Temperature Range: -55°C to 150°C

Secondary Electrical Parameters:

Vce Saturation (Max): 300 mV @ 5mA, 50mA
Frequency - Transition: 300 MHz
Power - Max: 625 mW

Mechanical Parameters:

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

Parts meeting all primary electrical parameters and mechanical requirements are classified as direct substitutes. Parts with minor variations in secondary parameters (transition frequency, power rating) are classified as similar alternatives.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency - Transition	hFE (Min)	Vce Sat (Max)	Package	Product Status
2N3904RLRPG	onsemi	200 mA	40 V	625 mW	300 MHz	100 @ 10mA, 1V	300mV @ 5mA, 50mA	TO-92-3	Obsolete
2N3904TA	onsemi	200 mA	40 V	625 mW	300 MHz	100 @ 10mA, 1V	300mV @ 5mA, 50mA	TO-92-3	Active
2N3904TAR	onsemi	200 mA	40 V	625 mW	300 MHz	100 @ 10mA, 1V	300mV @ 5mA, 50mA	TO-92-3	Active
2N3904TF	onsemi	200 mA	40 V	625 mW	300 MHz	100 @ 10mA, 1V	300mV @ 5mA, 50mA	TO-92-3	Active
2N3904TFR	onsemi	200 mA	40 V	625 mW	300 MHz	100 @ 10mA, 1V	300mV @ 5mA, 50mA	TO-92-3	Active
2N3904-AP	Micro Commercial Co	200 mA	40 V	625 mW	250 MHz	100 @ 10mA, 1V	400mV @ 5mA, 50mA	TO-92-3	Obsolete
500-00001	Parallax Inc.	200 mA	40 V	1.5 W	300 MHz	100 @ 10mA, 1V	300mV @ 5mA, 50mA	TO-92-3	Active

Engineering Selection Recommendations

Direct Substitutes (onsemi Variants):

The parts 2N3904TA, 2N3904TAR, 2N3904TF, and 2N3904TFR are direct electrical and mechanical equivalents to the 2N3904RLRPG. All four parts are manufactured by onsemi, share identical electrical specifications, and are packaged in TO-92-3 through-hole configuration. These parts are classified as active products with ROHS3 compliance and REACH unaffected status. The primary distinction between these variants is packaging format (Cut Tape) and inventory availability. Selection among these four parts is based on supply chain requirements and packaging preferences.

Alternative Substitute (Micro Commercial Co):

The 2N3904-AP manufactured by Micro Commercial Co meets the primary electrical requirements but exhibits two parameter variations: transition frequency of 250 MHz (versus 300 MHz) and Vce saturation of 400 mV (versus 300 mV). This part is classified as obsolete. Use of this part is limited to applications where the reduced transition frequency and higher saturation voltage do not impact circuit performance.

Similar Alternative (Parallax Inc.):

The 500-00001 manufactured by Parallax Inc. matches all primary electrical specifications and transition frequency but provides enhanced power dissipation capability at 1.5 W (versus 625 mW). This part is active and suitable for applications requiring higher power handling. The increased power rating does not create incompatibility with circuits designed for the 2N3904RLRPG.

Frequently Asked Questions (FAQ)

Q: Can 2N3904TA, 2N3904TAR, 2N3904TF, and 2N3904TFR be used interchangeably with 2N3904RLRPG?

A: Yes. These four onsemi variants are direct electrical and mechanical equivalents. All share identical collector current, breakdown voltage, power dissipation, transition frequency, current gain, and saturation voltage specifications. The differences are packaging format (Cut Tape versus other formats) and inventory status. Selection is based on supply availability and packaging requirements.

Q: What are the differences between the onsemi 2N3904 variants?

A: The onsemi variants (2N3904TA, 2N3904TAR, 2N3904TF, 2N3904TFR) are electrically identical. Differences are in packaging format and supplier device package designation. All are supplied in Cut Tape format and packaged as TO-92-3. Inventory quantities vary by variant.

Q: Can 2N3904-AP be used as a substitute?

A: The 2N3904-AP meets primary electrical requirements but has reduced transition frequency (250 MHz versus 300 MHz) and higher Vce saturation (400 mV versus 300 mV). This part is suitable only for applications where these parameter variations do not affect circuit operation. Both the 2N3904RLRPG and 2N3904-AP are classified as obsolete.

Q: Is 500-00001 a suitable replacement?

A: The 500-00001 is electrically compatible with the 2N3904RLRPG for all primary parameters. The key difference is enhanced power dissipation at 1.5 W versus 625 mW. This higher power rating is beneficial for applications requiring greater thermal margin and does not create incompatibility. The 500-00001 is an active product.

Q: What is the significance of the TO-92-3 package designation?

A: TO-92-3 is a through-hole package with three leads (Base, Collector, Emitter) in a formed-lead configuration. All substitute parts use this same package, ensuring mechanical and pin compatibility with the original 2N3904RLRPG. This allows direct board-level substitution without layout modifications.

Q: Are there compliance differences between substitute parts?

A: The onsemi variants (2N3904TA, 2N3904TAR, 2N3904TF, 2N3904TFR) are ROHS3 compliant. The 2N3904-AP and 500-00001 compliance status is not specified in the provided data. All parts are REACH unaffected and classified under ECCN EAR99.

Q: Why is the 2N3904RLRPG classified as obsolete?

A: The 2N3904RLRPG is marked as obsolete by onsemi. Active equivalent parts are available from the same manufacturer (2N3904TA, 2N3904TAR, 2N3904TF, 2N3904TFR), making transition to current production variants necessary for new designs and ongoing production support.

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