MPS6729G Equivalent & Substitute Parts

Part Overview

The MPS6729G 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 component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MPS6729G serves applications requiring moderate voltage and current switching capabilities with PNP polarity in compact through-hole form factors.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the MPS6729G is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: PNP polarity required
Voltage Rating: Collector-emitter breakdown voltage must equal or exceed 80 V
Current Rating: Maximum collector current must equal or exceed 500 mA
Package Type: Through Hole TO-92 form factor
Operating Temperature: -55°C to 150°C range

Secondary Compatibility Factors:

Power dissipation capability
Saturation voltage characteristics
DC current gain (hFE) specifications
Product status and availability

The substitute parts listed below meet the primary substitution criteria. Parts with lower voltage or current ratings do not qualify as direct substitutes for applications requiring the full 80 V / 500 mA specification.

Parameter Comparison

Parameter	MPS6729G (onsemi)	2N3906BU (Fairchild)	2N4403BU (Fairchild)	MPSA56-AP (MCC)
Transistor Type	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	80 V	40 V	40 V	80 V
Current - Collector (Ic) (Max)	500 mA	200 mA	600 mA	500 mA
Power - Max	1 W	625 mW	625 mW	625 mW
Vce Saturation (Max)	500 mV @ 10 mA, 250 mA	400 mV @ 5 mA, 50 mA	750 mV @ 50 mA, 500 mA	250 mV @ 10 mA, 100 mA
DC Current Gain (hFE) (Min)	50 @ 250 mA, 1 V	100 @ 10 mA, 1 V	100 @ 150 mA, 2 V	100 @ 100 mA, 1 V
Operating Temperature Range	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Obsolete

Engineering Selection Recommendations

MPSA56-AP (Micro Commercial Co) provides the closest electrical equivalence to the MPS6729G. Both devices share identical 80 V collector-emitter breakdown voltage and 500 mA maximum collector current ratings. The MPSA56-AP maintains the same operating temperature range and TO-92-3 package configuration. Although the MPSA56-AP is classified as obsolete, it remains available in inventory (793 pcs) and carries ROHS3 compliance certification. This part is suitable for direct substitution in applications where the full 80 V / 500 mA specification is required.

2N4403BU (Fairchild Semiconductor) is an active product with higher collector current capability (600 mA) but reduced voltage rating (40 V). This part is not suitable for applications requiring 80 V operation. The 2N4403BU is appropriate only for designs operating at 40 V or lower.

2N3906BU (Fairchild Semiconductor) is an active product with reduced voltage (40 V) and current (200 mA) ratings. This part does not meet the electrical requirements of the MPS6729G and is not a suitable substitute for applications requiring 80 V / 500 mA operation.

Frequently Asked Questions (FAQ)

Q: Can the 2N3906BU or 2N4403BU replace the MPS6729G in my circuit?

A: The 2N3906BU and 2N4403BU are not suitable direct substitutes. Both devices have maximum collector-emitter breakdown voltages of 40 V, which is insufficient for applications designed for the MPS6729G's 80 V rating. Using these parts in 80 V circuits will result in device failure. These parts are appropriate only for circuits operating at 40 V or lower.

Q: What is the primary advantage of the MPSA56-AP as a substitute?

A: The MPSA56-AP maintains electrical parity with the MPS6729G across all critical parameters: 80 V collector-emitter breakdown voltage, 500 mA maximum collector current, and identical TO-92-3 package configuration. Both devices operate across the same temperature range (-55°C to 150°C), ensuring functional compatibility in existing designs.

Q: Are there differences in saturation voltage between the MPS6729G and MPSA56-AP?

A: Yes. The MPS6729G exhibits 500 mV saturation voltage at 10 mA base current and 250 mA collector current. The MPSA56-AP shows 250 mV saturation voltage at 10 mA base current and 100 mA collector current. These differences reflect different measurement conditions and should be evaluated against specific circuit requirements.

Q: Does the MPSA56-AP's obsolete status affect its suitability as a substitute?

A: The MPSA56-AP is classified as obsolete but remains available in current inventory (793 pcs). Obsolete status indicates the manufacturer has discontinued production but does not preclude its use in new designs where supply is available. For long-term production requirements, active alternatives should be evaluated, though none provide equivalent electrical specifications at 80 V / 500 mA.

Q: Are all substitute parts available in the same packaging format?

A: Yes. The MPS6729G, MPSA56-AP, 2N3906BU, and 2N4403BU are all supplied in Through Hole TO-92-3 packages. Physical form factor compatibility is maintained across all listed parts, allowing direct mechanical substitution where electrical specifications permit.

Q: What compliance certifications apply to these parts?

A: The MPSA56-AP carries ROHS3 compliance certification and is REACH Unaffected. The MPS6729G is REACH Unaffected. All listed parts are classified under ECCN EAR99 for export control purposes. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for applicable parts.

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