MPSA13-AP NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The MPSA13-AP is an NPN Darlington bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device features a 30 V collector-emitter breakdown voltage rating and 500 mA maximum collector current in a Through Hole TO-92 package.

The MPSA13-AP is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor topology.

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	1.5 V @ 100 µA, 100 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	10000 @ 100 mA, 5 V	—
Power - Max	1.5	W
Frequency - Transition	125	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the MPSA13-AP is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Transistor topology: NPN - Darlington configuration
Maximum collector current: 500 mA
Collector-emitter breakdown voltage: 30 V
Saturation voltage: 1.5 V @ 100 µA, 100 mA
Collector cutoff current: 100 nA
DC current gain (hFE): 10000 minimum @ 100 mA, 5 V
Transition frequency: 125 MHz

Mechanical Parameters (Must Match):

Mounting type: Through Hole
Package designation: TO-92-3 (TO-226AA) with formed leads

The KSP13TA manufactured by onsemi meets all specified electrical and mechanical parameters for direct substitution. Differences in maximum power dissipation rating and operating temperature maximum do not preclude substitution when the application operates within the substitute part's thermal and power envelope.

Parameter Comparison

Parameter	MPSA13-AP (Micro Commercial Co)	KSP13TA (onsemi)	Match Status
Transistor Type	NPN - Darlington	NPN - Darlington	Equivalent
Current - Collector (Ic) (Max)	500 mA	500 mA	Equivalent
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	Equivalent
Vce Saturation (Max) @ Ib, Ic	1.5 V @ 100 µA, 100 mA	1.5 V @ 100 µA, 100 mA	Equivalent
Current - Collector Cutoff (Max)	100 nA	100 nA	Equivalent
DC Current Gain (hFE) (Min) @ Ic, Vce	10000 @ 100 mA, 5 V	10000 @ 100 mA, 5 V	Equivalent
Frequency - Transition	125 MHz	125 MHz	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	Equivalent
Power - Max	1.5 W	625 mW	Substitute rated lower
Operating Temperature (Max)	150 °C	150 °C	Equivalent
Product Status	Obsolete	Active	Substitute actively produced
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

Primary Substitute: KSP13TA (onsemi)

The KSP13TA is the direct electrical and mechanical equivalent to the MPSA13-AP. Selection of the KSP13TA is supported by the following factors:

Product Status: The KSP13TA maintains active production status, ensuring long-term supply availability and design continuity compared to the obsolete MPSA13-AP.
Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH Unaffected status, satisfying environmental and regulatory requirements without modification to existing designs.
Electrical Equivalence: All critical electrical parameters—collector current, breakdown voltage, saturation voltage, current gain, and transition frequency—are identical between the two devices.
Mechanical Compatibility: Both devices utilize the TO-92-3 package with formed leads, enabling direct pin-compatible substitution without PCB layout modification.
Power Dissipation Consideration: The KSP13TA is rated at 625 mW maximum power dissipation compared to 1.5 W for the MPSA13-AP. Applications operating within the 625 mW thermal envelope experience no functional limitation. Applications requiring sustained power dissipation exceeding 625 mW require thermal analysis to confirm the substitute part operates within specified junction temperature limits.

Frequently Asked Questions (FAQ)

Q: Can the KSP13TA directly replace the MPSA13-AP without circuit modification?

A: Yes. The KSP13TA is pin-compatible and electrically equivalent across all specified parameters. No circuit modification is required for direct substitution in applications where power dissipation remains within 625 mW.

Q: What is the significance of the different power ratings (1.5 W vs. 625 mW)?

A: The power rating indicates maximum continuous power dissipation under specified thermal conditions. The KSP13TA's lower rating does not affect switching or amplification performance. Applications must confirm that actual power dissipation in the circuit does not exceed 625 mW. Thermal management or circuit redesign may be necessary for applications originally designed to dissipate power near the 1.5 W limit.

Q: Are there any differences in the TO-92-3 package between manufacturers?

A: Both the MPSA13-AP and KSP13TA utilize the TO-92-3 (TO-226AA) package with formed leads. Package dimensions and lead spacing are standardized, ensuring mechanical compatibility and direct PCB substitution.

Q: Why is the MPSA13-AP classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The KSP13TA, maintained in active production by onsemi, provides equivalent functionality with assured supply availability.

Q: Do both devices meet the same regulatory standards?

A: Yes. Both the MPSA13-AP and KSP13TA are ROHS3 compliant and REACH Unaffected, satisfying current environmental and chemical restriction requirements.

Q: What is the operating temperature range for the KSP13TA?

A: The KSP13TA operates across a maximum junction temperature of 150 °C, equivalent to the MPSA13-AP. Minimum operating temperature is not specified in the provided parameters.

Q: Can the KSP13TA be used in high-frequency applications?

A: Yes. The KSP13TA maintains a transition frequency of 125 MHz, identical to the MPSA13-AP, supporting high-frequency switching and amplification applications within this bandwidth.

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