KSP06BU Equivalent & Substitute Parts

Part Overview

The KSP06BU is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal switching and amplification applications. This device features an 80 V collector-emitter breakdown voltage rating and a maximum collector current of 500 mA, housed in a TO-92-3 through-hole package. The KSP06BU is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and production continuity. Equivalent parts must maintain identical electrical characteristics and mechanical compatibility to ensure direct replacement without circuit redesign.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	80	V
Vce Saturation (Max)	250	mV @ 10mA, 100mA
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE Min)	50	@ 100mA, 1V
Maximum Power Dissipation	625	mW
Transition Frequency	100	MHz
Operating Temperature (Max)	150	°C
Package Type	TO-92-3	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the KSP06BU are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

Transistor type: NPN
Collector current rating: 500 mA maximum
Collector-emitter breakdown voltage: 80 V maximum
Vce saturation: 250 mV @ 10mA, 100mA
Collector cutoff current: 100 nA maximum
Power dissipation: 625 mW maximum
Transition frequency: 100 MHz minimum
DC current gain (hFE): minimum 50 @ 100mA, 1V

Mechanical Parameters (Must Match):

Package type: TO-92-3 (TO-226-3)
Mounting type: Through hole

Compliance Parameters:

RoHS3 compliance
REACH unaffected status
ECCN: EAR99
HTSUS: 8541.21.0075

Substitute parts meeting all electrical and mechanical criteria are listed below. Product status and availability are provided for procurement planning.

Parameter Comparison

Parameter	KSP06BU (onsemi)	MPSA06 (Fairchild)	MPSA06-AP (MCC)
Transistor Type	NPN	NPN	NPN
Collector Current (Max)	500 mA	500 mA	500 mA
Collector-Emitter Breakdown Voltage (Max)	80 V	80 V	80 V
Vce Saturation (Max)	250 mV @ 10mA, 100mA	250 mV @ 10mA, 100mA	250 mV @ 10mA, 100mA
Collector Cutoff Current (Max)	100 nA	100 nA	100 nA
DC Current Gain (hFE Min)	50 @ 100mA, 1V	100 @ 100mA, 1V	100 @ 100mA, 1V
Maximum Power Dissipation	625 mW	625 mW	625 mW
Transition Frequency	100 MHz	100 MHz	100 MHz
Operating Temperature (Max)	150°C	150°C	150°C
Package Type	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Obsolete
RoHS3 Compliance	Compliant	Not specified	Compliant

Engineering Selection Recommendations

MPSA06 (Fairchild Semiconductor) is the primary recommended substitute for the KSP06BU. This part maintains all electrical specifications and mechanical compatibility while offering the advantage of active product status, ensuring long-term availability and supply chain stability. The MPSA06 features an extended operating temperature range of −55°C to 150°C, providing broader thermal performance capability. DC current gain is specified at a minimum of 100 @ 100mA, 1V, which exceeds the KSP06BU minimum of 50, offering improved performance margin in gain-dependent applications.

MPSA06-AP (Micro Commercial Co) serves as a secondary substitute option. This part is electrically equivalent to the KSP06BU with matching DC current gain specifications (100 @ 100mA, 1V) and maintains RoHS3 compliance. However, MPSA06-AP is classified as obsolete, similar to the KSP06BU, which may present long-term availability constraints. This part is suitable for applications where existing inventory or procurement channels support its use.

Both substitute parts satisfy all mandatory electrical and mechanical parameters, RoHS3 compliance requirements, and REACH unaffected status. Selection between MPSA06 and MPSA06-AP should be based on procurement availability, supply chain requirements, and long-term production planning considerations.

Frequently Asked Questions (FAQ)

Q: Can the MPSA06 directly replace the KSP06BU without circuit modification?

A: Yes. The MPSA06 maintains identical electrical ratings for collector current (500 mA), collector-emitter breakdown voltage (80 V), saturation voltage (250 mV @ 10mA, 100mA), power dissipation (625 mW), and transition frequency (100 MHz). Both devices use the TO-92-3 through-hole package with identical pinout and mechanical dimensions. Direct substitution is supported without circuit redesign.

Q: What is the difference in DC current gain between the KSP06BU and substitute parts?

A: The KSP06BU specifies a minimum DC current gain (hFE) of 50 @ 100mA, 1V. Both the MPSA06 and MPSA06-AP specify a minimum hFE of 100 @ 100mA, 1V. This represents a higher gain specification in the substitute parts, which provides improved performance margin in gain-dependent circuit configurations. Circuits designed for the KSP06BU will operate within specification using either substitute part.

Q: Are there temperature range differences between the KSP06BU and MPSA06?

A: The KSP06BU specifies a maximum operating temperature of 150°C. The MPSA06 specifies an operating temperature range of −55°C to 150°C, providing extended low-temperature capability. The MPSA06-AP specifies a maximum operating temperature of 150°C, matching the KSP06BU. For applications requiring operation below −55°C, the MPSA06 offers superior thermal performance.

Q: What is the product status significance for long-term production?

A: The KSP06BU and MPSA06-AP are both classified as obsolete, indicating discontinued manufacturing. The MPSA06 maintains active product status, meaning it is currently manufactured and supported by Fairchild Semiconductor. For designs requiring long-term production support and supply chain continuity, the MPSA06 is the recommended choice.

Q: Are all substitute parts RoHS3 compliant?

A: The KSP06BU and MPSA06-AP are both specified as RoHS3 compliant. The MPSA06 datasheet does not explicitly specify RoHS3 compliance status in the provided parameters. For applications with mandatory RoHS3 compliance requirements, the KSP06BU or MPSA06-AP should be verified against current Fairchild documentation.

Q: Can the MPSA06-AP be used as a substitute if the MPSA06 is unavailable?

A: Yes. The MPSA06-AP is electrically and mechanically equivalent to the KSP06BU, with matching electrical specifications and RoHS3 compliance. However, as an obsolete part, MPSA06-AP availability may be limited to existing inventory channels. Procurement should verify current stock status before committing to this alternative.

Q: Are the TO-92-3 packages physically identical across all three parts?

A: Yes. All three parts (KSP06BU, MPSA06, and MPSA06-AP) use the TO-92-3 (TO-226-3) through-hole package with identical mechanical dimensions and pinout configuration. Physical board layout and component placement require no modification when substituting between these parts.

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