MPS651_D26Z Equivalent & Substitute Parts

Part Overview

The MPS651_D26Z is an NPN bipolar junction transistor manufactured by onsemi, rated for 60V collector-emitter breakdown voltage and 800mA maximum collector current in a TO-92-3 through-hole package. This device is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity. The 625mW power dissipation rating and 75MHz transition frequency establish the performance envelope for compatible alternatives.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	800	mA
Power - Max	625	mW
Frequency - Transition	75	MHz
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the MPS651_D26Z is determined by the following critical parameters:

Mandatory Matching Criteria:

Transistor Type: NPN configuration
Current - Collector (Ic) (Max): 800mA minimum
Power - Max: 625mW minimum
Mounting Type: Through Hole
Package / Case: TO-92-3 compatible form factor
Operating Temperature: 150°C maximum junction temperature

Allowable Variation Parameters:

Voltage - Collector Emitter Breakdown: Substitute parts rated at 45V are acceptable for applications not requiring the full 60V rating
Frequency - Transition: Substitute parts with higher transition frequency (210MHz) provide enhanced performance margin
DC Current Gain (hFE): Variation in gain specifications does not preclude substitution when other parameters align

The identified substitute parts BC337-25-AP and BC337-AP meet the mandatory criteria with the exception of reduced voltage rating (45V versus 60V). These substitutes are suitable only for applications where the operating collector-emitter voltage does not exceed 45V.

Parameter Comparison

Parameter	MPS651_D26Z	BC337-25-AP	BC337-AP
Manufacturer	onsemi	Micro Commercial Co	Micro Commercial Co
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) (Max)	800 mA	800 mA	800 mA
Voltage - Collector Emitter Breakdown (Max)	60 V	45 V	45 V
Power - Max	625 mW	625 mW	625 mW
Frequency - Transition	75 MHz	210 MHz	210 MHz
Operating Temperature (Max)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Obsolete	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BC337-AP is the preferred substitute for new designs and ongoing procurement. This part maintains active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The BC337-AP operates within the same thermal envelope (150°C maximum junction temperature) and delivers identical current and power ratings.

BC337-25-AP provides an alternative with equivalent electrical performance characteristics but carries obsolete product status classification, limiting its suitability for new applications despite current inventory availability.

Voltage Rating Consideration: Both substitute parts are rated for 45V maximum collector-emitter breakdown voltage, compared to the 60V rating of the MPS651_D26Z. Substitution is valid only when circuit design ensures collector-emitter voltage remains below 45V during all operating conditions, including transient events.

Compliance Status: BC337-AP and BC337-25-AP both carry REACH Unaffected designation and EAR99 export classification, matching the regulatory profile of the original MPS651_D26Z.

Frequently Asked Questions (FAQ)

Q: Can BC337-AP directly replace MPS651_D26Z in all applications?

A: BC337-AP is a direct functional replacement when the circuit design does not require the 60V collector-emitter breakdown voltage rating. If your application operates at collector-emitter voltages below 45V, substitution is valid. If your design requires the full 60V rating, BC337-AP is not suitable.

Q: What is the primary difference between BC337-25-AP and BC337-AP?

A: Both parts share identical electrical specifications and package form factor. The distinction is product status: BC337-25-AP is classified as obsolete, while BC337-AP maintains active status. For new designs, BC337-AP is the preferred selection.

Q: Are the TO-92-3 packages of all three parts mechanically identical?

A: All three parts use TO-92-3 (TO-226AA) formed leads through-hole packaging. Mechanical compatibility is confirmed for PCB mounting and thermal management applications.

Q: Does the higher transition frequency of BC337 parts affect substitution suitability?

A: The BC337 series operates at 210MHz transition frequency compared to 75MHz for the MPS651_D26Z. This higher frequency capability does not preclude substitution; it provides additional performance margin for high-frequency applications. Circuits designed for 75MHz operation function correctly with the higher-frequency substitute.

Q: What compliance certifications apply to substitute parts?

A: BC337-AP and BC337-25-AP both carry ROHS3 compliance certification and REACH Unaffected status. Both parts are classified under ECCN EAR99 for export purposes, matching the regulatory classification of the original MPS651_D26Z.

Q: Is there an inventory advantage to selecting one substitute over the other?

A: BC337-25-AP maintains higher inventory levels (8300 units) compared to BC337-AP (1047 units). However, BC337-AP's active product status provides superior long-term procurement reliability despite lower current stock levels.

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