KSP05BU Equivalent & Substitute Parts

Part Overview

The KSP05BU is an NPN bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 500 mA maximum collector current in a TO-92-3 through-hole package. This device is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design support and production requirements. The KSP05BU remains available in inventory (793 pieces), but obsolete status indicates limited future availability and potential supply discontinuation.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	500	mA
Vce Saturation (Max) @ Ib, Ic	250 mV @ 10 mA, 100 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100 mA, 1 V	—
Power - Max	625	mW
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the KSP05BU is determined by electrical and mechanical parameter compatibility within the NPN bipolar transistor category. The critical parameters governing substitution are:

Electrical Parameters:

Collector-emitter breakdown voltage (VCEO) must equal or exceed the original specification
Maximum collector current (Ic) must equal or exceed the original specification
Saturation voltage (Vce) characteristics must be compatible
DC current gain (hFE) must meet or exceed minimum requirements
Transition frequency must equal or exceed the original specification
Power dissipation rating must equal or exceed the original specification

Mechanical Parameters:

Package type must be TO-92-3 (TO-226AA) through-hole configuration
Lead formation and pin assignment must be identical

The MPSA06RA meets all substitution criteria through equivalent or superior electrical ratings and identical mechanical packaging.

Parameter Comparison

Parameter	KSP05BU	MPSA06RA	Compatibility
Transistor Type	NPN	NPN	Identical
Voltage - Collector Emitter Breakdown (Max)	60 V	80 V	Compatible (higher rating)
Current - Collector (Ic) (Max)	500 mA	500 mA	Identical
Vce Saturation (Max) @ Ib, Ic	250 mV @ 10 mA, 100 mA	250 mV @ 10 mA, 100 mA	Identical
Current - Collector Cutoff (Max)	100 nA	100 nA	Identical
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100 mA, 1 V	100 @ 100 mA, 1 V	Compatible (higher gain)
Power - Max	625 mW	625 mW	Identical
Frequency - Transition	100 MHz	100 MHz	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	Identical

Engineering Selection Recommendations

KSP05BU Status: Obsolete product with limited future availability. Current inventory of 793 pieces does not guarantee long-term supply continuity. REACH Unaffected status applies.

MPSA06RA Status: Active product with robust inventory (6100 pieces) and confirmed long-term availability. RoHS3 Compliant and REACH Unaffected. This device is the recommended substitute for new designs and production continuity.

Selection Basis:

The MPSA06RA provides superior electrical performance through higher collector-emitter breakdown voltage (80 V versus 60 V) and increased DC current gain (100 versus 50 at 100 mA, 1 V). These enhancements ensure compatibility with the KSP05BU in all applications while providing additional design margin. Identical saturation voltage, maximum collector current, power dissipation, and transition frequency specifications ensure functional equivalence. Mechanical compatibility is confirmed through identical TO-92-3 through-hole packaging.

The MPSA06RA is suitable for direct replacement in existing KSP05BU applications without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the MPSA06RA directly replace the KSP05BU without circuit changes?

A: Yes. The MPSA06RA is electrically and mechanically compatible with the KSP05BU. Identical saturation voltage, collector current, power dissipation, and transition frequency specifications ensure functional equivalence. The higher breakdown voltage and DC current gain of the MPSA06RA provide additional design margin without requiring circuit modification.

Q: What is the primary difference between the KSP05BU and MPSA06RA?

A: The MPSA06RA features a higher collector-emitter breakdown voltage (80 V versus 60 V) and higher DC current gain (100 versus 50 at 100 mA, 1 V). Both devices share identical saturation voltage, maximum collector current, power dissipation, and transition frequency ratings.

Q: Are the packages identical?

A: Yes. Both the KSP05BU and MPSA06RA use the TO-92-3 (TO-226AA) through-hole package with identical lead configuration and pin assignment.

Q: Why is the KSP05BU classified as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued active production and support for this device. While current inventory exists, future availability is not guaranteed. The MPSA06RA is an active product with confirmed long-term availability.

Q: Does the MPSA06RA meet RoHS compliance requirements?

A: Yes. The MPSA06RA is RoHS3 Compliant. The KSP05BU does not specify RoHS status.

Q: What is the operating temperature range for each device?

A: The KSP05BU specifies a maximum junction temperature of 150°C. The MPSA06RA specifies an operating temperature range of −55°C to 150°C (TJ), providing a defined lower temperature limit.

Q: Are there any moisture sensitivity considerations?

A: The KSP05BU is classified as MSL 1 (Unlimited). The MPSA06RA is listed as Not Applicable for moisture sensitivity level, indicating no moisture sensitivity restrictions.

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