MPSA14 Equivalent & Substitute Parts

Part Overview

The MPSA14 is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. The device operates at a maximum collector current of 500 mA with a collector-emitter breakdown voltage of 30 V and dissipates up to 625 mW. The MPSA14 is mounted in a Through Hole TO-92 package and features a transition frequency of 125 MHz.

The MPSA14 is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing production requirements, maintenance operations, and system redesigns where component availability is constrained.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	500	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 100µA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
Power - Max	625	mW
Frequency - Transition	125	MHz
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature Range	-55 to 150	°C

Substitute Part Grouping Explanation

Substitute parts for the MPSA14 are identified based on electrical and mechanical parameter equivalence within the NPN Darlington transistor category. The substitution criteria are:

Electrical Parameters (Must Match):

Transistor Type: NPN - Darlington
Maximum Collector Current (Ic): 500 mA
Collector-Emitter Breakdown Voltage: 30 V
Vce Saturation: 1.5V @ 100µA, 100mA
Collector Cutoff Current: 100 nA
Maximum Power Dissipation: 625 mW
Transition Frequency: 125 MHz

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: TO-92-3

Compliance Considerations:

RoHS compliance status
REACH compliance status

The KSP13BU meets all electrical and mechanical parameter requirements for direct substitution. Variations in DC Current Gain (hFE) and operating temperature maximum do not disqualify substitution when the primary electrical specifications are satisfied.

Parameter Comparison

Parameter	MPSA14	KSP13BU	Match
Manufacturer	onsemi	onsemi	Yes
Transistor Type	NPN - Darlington	NPN - Darlington	Yes
Current - Collector (Ic) (Max)	500 mA	500 mA	Yes
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	Yes
Vce Saturation (Max) @ Ib, Ic	1.5V @ 100µA, 100mA	1.5V @ 100µA, 100mA	Yes
Current - Collector Cutoff (Max)	100 nA	100 nA	Yes
Power - Max	625 mW	625 mW	Yes
Frequency - Transition	125 MHz	125 MHz	Yes
Mounting Type	Through Hole	Through Hole	Yes
Package / Case	TO-92-3	TO-92-3	Yes
DC Current Gain (hFE) (Min) @ Ic, Vce	20000 @ 100mA, 5V	10000 @ 100mA, 5V	No
Operating Temperature (TJ)	-55°C ~ 150°C	150°C	Partial
Product Status	Obsolete	Active	—
RoHS Status	RoHS non-compliant	ROHS3 Compliant	No

Engineering Selection Recommendations

The KSP13BU is a direct electrical and mechanical substitute for the MPSA14 across all critical parameters: collector current, breakdown voltage, saturation voltage, cutoff current, power dissipation, transition frequency, and package type. Both devices are manufactured by onsemi and are classified as REACH Unaffected.

Product Status Consideration: The MPSA14 is obsolete, while the KSP13BU is active. The KSP13BU is the recommended substitute for new designs and ongoing production support.

Compliance Consideration: The MPSA14 is RoHS non-compliant. The KSP13BU is ROHS3 compliant. For applications subject to RoHS requirements, the KSP13BU provides compliance alignment.

DC Current Gain Variation: The KSP13BU exhibits a lower minimum DC Current Gain (hFE) of 10000 compared to the MPSA14's 20000 at the same test conditions (100 mA, 5V). This difference does not affect substitution eligibility when circuit designs do not depend on the higher gain specification.

Operating Temperature Range: The MPSA14 specifies a lower operating temperature limit of -55°C, while the KSP13BU specifies 150°C maximum only. For applications requiring operation below 0°C, the KSP13BU may not be suitable.

Frequently Asked Questions (FAQ)

Q: Can the KSP13BU replace the MPSA14 in existing circuits?

A: Yes. The KSP13BU matches all critical electrical parameters (collector current, breakdown voltage, saturation voltage, cutoff current, power dissipation, and transition frequency) and uses the identical TO-92-3 package. Direct pin-for-pin substitution is supported.

Q: What is the difference in DC Current Gain between these parts?

A: The MPSA14 specifies a minimum hFE of 20000 at 100 mA and 5V, while the KSP13BU specifies a minimum hFE of 10000 at the same conditions. The KSP13BU has lower gain. Circuits designed with gain margin or that do not depend on the higher specification will function without modification.

Q: Are there package differences between the MPSA14 and KSP13BU?

A: No. Both devices use the TO-92-3 Through Hole package. Physical dimensions and pin assignments are identical, enabling direct board-level substitution.

Q: What is the significance of the product status difference?

A: The MPSA14 is classified as obsolete, indicating discontinued production and limited availability. The KSP13BU is active, ensuring ongoing supply and manufacturing support. For new designs and production continuity, the KSP13BU is the appropriate selection.

Q: Does the KSP13BU meet RoHS requirements?

A: Yes. The KSP13BU is ROHS3 compliant. The MPSA14 is RoHS non-compliant. For applications subject to RoHS directives, the KSP13BU provides regulatory compliance.

Q: Can the KSP13BU operate at -55°C like the MPSA14?

A: The KSP13BU specifies a maximum operating temperature of 150°C only, without a stated lower temperature limit. For applications requiring operation at -55°C, the KSP13BU specifications do not guarantee performance at this temperature. Verify application temperature requirements before substitution.

Q: Are both parts manufactured by the same company?

A: Yes. Both the MPSA14 and KSP13BU are manufactured by onsemi, ensuring consistent quality standards and design philosophy.

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