MPS6729 Equivalent & Substitute Parts

Part Overview

The MPS6729 is a PNP bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current in a Through Hole TO-92 package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The MPS6729 operates across a temperature range of -55°C to 150°C and delivers 1 W maximum power dissipation, suitable for general-purpose switching and amplification applications in legacy and current circuit designs.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	1	W
Vce Saturation (Max) @ Ib, Ic	500mV @ 10mA, 250mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 250mA, 1V	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226)	—

Substitute Part Grouping Explanation

Substitution of the MPS6729 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP configuration required
Voltage Rating: Collector-emitter breakdown voltage must equal or exceed 80 V
Current Rating: Maximum collector current must equal or exceed 500 mA
Power Dissipation: Maximum power rating must equal or exceed 1 W
Package Type: Through Hole TO-92-3 (TO-226) configuration
Operating Temperature: Must support -55°C to 150°C range

Substitute Classification:

Full Electrical Equivalents (80 V, 500 mA class):

MPSA56-AP: Matches 80 V breakdown voltage and 500 mA collector current specifications. Identical operating temperature range. Through Hole TO-92 package compatibility confirmed.

Reduced Voltage Substitutes (40 V class):

2N4403BU: Operates at 40 V breakdown voltage with 600 mA collector current capability. Suitable for applications where circuit voltage does not exceed 40 V.
2N3906BU: Operates at 40 V breakdown voltage with 200 mA collector current capability. Suitable for lower-current applications not exceeding 40 V.

Parameter Comparison

Parameter	MPS6729	MPSA56-AP	2N4403BU	2N3906BU
Manufacturer	onsemi	Micro Commercial Co	Fairchild Semiconductor	Fairchild Semiconductor
Transistor Type	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	40 V	40 V
Current - Collector (Ic) (Max)	500 mA	500 mA	600 mA	200 mA
Power - Max	1 W	625 mW	625 mW	625 mW
Vce Saturation (Max) @ Ib, Ic	500mV @ 10mA, 250mA	250mV @ 10mA, 100mA	750mV @ 50mA, 500mA	400mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 250mA, 1V	100 @ 100mA, 1V	100 @ 150mA, 2V	100 @ 10mA, 1V
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3 (TO-226)	TO-92 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)
Product Status	Obsolete	Obsolete	Active	Active

Engineering Selection Recommendations

MPSA56-AP is the primary direct substitute for MPS6729. This device maintains identical electrical specifications: 80 V collector-emitter breakdown voltage, 500 mA maximum collector current, and -55°C to 150°C operating temperature range. Both devices are classified as obsolete, indicating similar market lifecycle status. MPSA56-AP is RoHS3 compliant, providing regulatory advantage over the non-compliant MPS6729. Package compatibility is confirmed through TO-92 Through Hole configuration. Inventory availability of 793 units supports production requirements.

2N4403BU serves as an active-status substitute for applications operating at voltages not exceeding 40 V. This device provides 600 mA collector current capability, exceeding the MPS6729 specification, with identical operating temperature range. Active product status ensures long-term availability and supply chain stability. Package configuration matches TO-92-3 Through Hole requirements. Inventory of 69,662 units provides robust supply assurance.

2N3906BU is suitable only for reduced-current applications not exceeding 200 mA collector current and 40 V operating voltage. This device maintains identical operating temperature range and Through Hole TO-92-3 package compatibility. Active product status and high inventory (50,200 units) support availability. This substitute is appropriate for legacy circuit designs operating within specified current and voltage constraints.

Frequently Asked Questions (FAQ)

Q: Can MPSA56-AP directly replace MPS6729 in all applications?

A: MPSA56-AP provides direct electrical substitution for MPS6729 across all specified parameters: 80 V breakdown voltage, 500 mA collector current, and identical operating temperature range. Both devices use Through Hole TO-92 packaging. Functional compatibility is confirmed for applications designed to MPS6729 specifications.

Q: What are the limitations of using 2N4403BU as a substitute?

A: 2N4403BU operates at 40 V maximum breakdown voltage, compared to MPS6729's 80 V rating. This device is suitable only for circuits where the collector-emitter voltage does not exceed 40 V. The 600 mA collector current capability exceeds MPS6729 requirements. Active product status provides supply chain advantages over the obsolete MPS6729.

Q: Is 2N3906BU suitable for high-current applications?

A: No. 2N3906BU is rated for 200 mA maximum collector current, significantly below the MPS6729's 500 mA specification. This device is appropriate only for low-current switching and amplification circuits. Applications requiring 500 mA operation must use MPSA56-AP or 2N4403BU.

Q: Are all substitute parts available in the same package configuration?

A: All substitute parts use Through Hole TO-92-3 (TO-226) packaging, maintaining mechanical compatibility with MPS6729. Pin configuration and lead spacing are identical across all listed devices, enabling direct socket substitution without circuit board modifications.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active-status devices (2N4403BU, 2N3906BU) provide long-term supply chain stability and continued manufacturing support. Obsolete-status devices (MPS6729, MPSA56-AP) have limited availability and may face supply discontinuation. For new designs, active-status substitutes are preferred when electrical specifications permit.

Q: How do saturation voltage characteristics affect substitution?

A: Saturation voltage (Vce) varies across substitute parts. MPSA56-AP exhibits 250 mV saturation at 10 mA, 100 mA, compared to MPS6729's 500 mV at 10 mA, 250 mA. Lower saturation voltage in MPSA56-AP indicates improved switching efficiency. Applications sensitive to saturation characteristics must evaluate specific operating points against datasheet specifications.

Q: Are there compliance differences between substitute options?

A: MPSA56-AP is RoHS3 compliant, providing regulatory advantage over the non-compliant MPS6729. 2N4403BU and 2N3906BU compliance status is not specified in provided parameters. For applications requiring RoHS compliance, MPSA56-AP is the preferred substitute when electrical specifications are satisfied.

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