2N3903_D74Z Equivalent & Substitute Parts

Part Overview

The 2N3903_D74Z is an NPN bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 200 mA maximum collector current in a TO-92-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 2N3903_D74Z serves general-purpose switching and amplification applications in low-power circuits requiring through-hole mounting.

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
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 50mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 10mA, 1V	—
Operating Temperature	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the 2N3903_D74Z is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): 40 V minimum
Current - Collector (Ic) (Max): 200 mA minimum
Power - Max: 625 mW minimum
Operating Temperature Range: -55°C to 150°C (required match)
Mounting Type: Through Hole (required match)
Package / Case: TO-92-3 compatible (required match)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents: Parts meeting or exceeding all primary substitution criteria with identical or superior electrical ratings and active product status.

Category B - Functional Equivalents: Parts meeting primary substitution criteria but with higher voltage or current ratings, or obsolete product status, suitable for applications where the 2N3903_D74Z specifications are not fully utilized.

Parameter Comparison

Parameter	2N3903_D74Z	2N3904TF	2N3904-AP	2N4401-AP	500-00001	MPSA06-AP
Manufacturer	onsemi	onsemi	Micro Commercial Co	Micro Commercial Co	Parallax Inc.	Micro Commercial Co
Product Status	Obsolete	Active	Obsolete	Obsolete	Active	Obsolete
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	40 V	40 V	40 V	80 V
Current - Collector (Ic) (Max)	200 mA	200 mA	200 mA	Not specified	200 mA	500 mA
Power - Max	625 mW	625 mW	625 mW	600 mW	1.5 W	625 mW
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 50mA	300mV @ 5mA, 50mA	400mV @ 5mA, 50mA	750mV @ 50mA, 500mA	300mV @ 5mA, 50mA	250mV @ 10mA, 100mA
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 10mA, 1V	100 @ 150mA, 1V	100 @ 10mA, 1V	100 @ 100mA, 1V
Frequency - Transition	Not specified	300 MHz	250 MHz	250 MHz	300 MHz	100 MHz
Operating Temperature	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92	TO-92	TO-92	TO-92
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

2N3904TF (onsemi) is the primary recommended substitute. This part maintains identical electrical specifications to the 2N3903_D74Z across all critical parameters: 40 V breakdown voltage, 200 mA collector current, 625 mW power dissipation, and -55°C to 150°C operating temperature range. The 2N3904TF holds active product status, ensuring long-term availability. The part is ROHS3 compliant and supplied in cut tape packaging. Higher DC current gain (100 vs. 50 @ 10mA, 1V) and specified transition frequency of 300 MHz provide performance margin for switching applications.

500-00001 (Parallax Inc.) serves as an alternative active-status substitute with identical voltage and current ratings. This part offers enhanced power dissipation capability (1.5 W vs. 625 mW) and specified transition frequency of 300 MHz. The higher power rating accommodates applications with greater thermal demands. Active product status ensures availability.

2N3904-AP (Micro Commercial Co) and 2N4401-AP (Micro Commercial Co) are functional equivalents with obsolete product status. Both maintain 40 V breakdown voltage and through-hole TO-92 packaging. The 2N3904-AP matches 200 mA collector current and 625 mW power rating. The 2N4401-AP exhibits higher saturation voltage (750 mV vs. 300 mV) and is specified for higher collector current operation (150 mA test point vs. 10 mA). Both are ROHS3 compliant.

MPSA06-AP (Micro Commercial Co) is a functional equivalent with higher voltage (80 V) and current (500 mA) ratings. This part is suitable for applications requiring greater electrical headroom but operates at lower transition frequency (100 MHz). Obsolete product status limits future availability.

For new designs and production continuity, 2N3904TF is the preferred selection. For applications requiring higher power dissipation, 500-00001 is recommended. Obsolete-status parts should be reserved for legacy system support only.

Frequently Asked Questions (FAQ)

Q: Can the 2N3904TF directly replace the 2N3903_D74Z in existing circuits?

A: Yes. The 2N3904TF maintains identical voltage (40 V), current (200 mA), and power (625 mW) specifications. Both operate across -55°C to 150°C and use TO-92-3 through-hole packaging. The higher DC current gain (100 vs. 50) provides improved switching performance without circuit modification.

Q: What is the difference between 2N3904TF and 2N3904-AP?

A: Both are 2N3904 base devices with identical voltage and current ratings. The 2N3904TF is manufactured by onsemi with active product status and ROHS3 compliance. The 2N3904-AP is manufactured by Micro Commercial Co with obsolete product status. The 2N3904-AP exhibits higher saturation voltage (400 mV vs. 300 mV @ 5mA, 50mA) and lower transition frequency (250 MHz vs. 300 MHz).

Q: Why is MPSA06-AP listed as a substitute if it has different voltage and current ratings?

A: MPSA06-AP is a functional equivalent for applications where the 2N3903_D74Z specifications are not fully utilized. The higher voltage (80 V) and current (500 mA) ratings provide design margin for circuits operating below the 2N3903_D74Z maximum ratings. However, the lower transition frequency (100 MHz) limits use in high-speed switching applications.

Q: Are there packaging differences between substitute parts?

A: The 2N3903_D74Z, 2N3904TF, 2N3904-AP, 2N4401-AP, 500-00001, and MPSA06-AP all use TO-92 through-hole packages with formed leads. The 2N3903_D74Z and 2N3904TF are specified as TO-92-3, while other substitutes are specified as TO-92. These designations refer to the same physical package and are mechanically interchangeable.

Q: Which substitute part has the best long-term availability?

A: The 2N3904TF holds active product status from onsemi, ensuring continued manufacturing and supply. The 500-00001 from Parallax Inc. also maintains active status. All other listed substitutes are classified as obsolete and should not be selected for new designs requiring long-term support.

Q: Can I use 500-00001 in place of 2N3904TF?

A: Yes, for applications where higher power dissipation (1.5 W vs. 625 mW) is beneficial. Both parts maintain identical voltage (40 V), current (200 mA), and operating temperature (-55°C to 150°C) specifications. The 500-00001 offers enhanced thermal capability and active product status. Selection depends on circuit power requirements and thermal design constraints.

Q: What does "DC Current Gain (hFE) (Min)" mean for substitution purposes?

A: DC current gain specifies the minimum amplification factor at defined collector current and collector-emitter voltage. The 2N3903_D74Z specifies 50 @ 10mA, 1V, while most substitutes specify 100 @ 10mA, 1V. Higher gain provides improved switching speed and reduced base drive requirements. Substitutes with higher gain are directly compatible and often provide performance improvement.

Q: Are all listed substitutes RoHS compliant?

A: The 2N3904TF, 2N3904-AP, 2N4401-AP, and MPSA06-AP are specified as ROHS3 compliant. The 2N3903_D74Z and 500-00001 do not specify RoHS status in the provided data. For applications requiring RoHS compliance certification, select from the four parts with explicit ROHS3 designation.

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