ZXTP2012A Equivalent & Substitute Parts

Part Overview

The ZXTP2012A is an active PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This Through Hole E-Line (TO-92 compatible) device operates at 60 V maximum collector-emitter breakdown voltage with a maximum collector current of 3.5 A and 1 W power dissipation capability. The part is ROHS3 compliant and carries unlimited moisture sensitivity level classification. Alternative equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across manufacturing environments.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	3.5	A
Power - Max	1	W
Frequency - Transition	120	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1A, 1V	—
Vce Saturation (Max) @ Ib, Ic	210mV @ 400mA, 4A	—
Current - Collector Cutoff (Max)	20	nA
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	E-Line-3	—
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitute parts for the ZXTP2012A are identified based on strict electrical and mechanical parameter compatibility. The substitution logic is organized into two categories:

Direct Substitutes (Packaging Variant): Parts that maintain identical electrical specifications and base product number but differ only in packaging format (Bulk versus Cut Tape). These parts are interchangeable at the component level when mechanical form factor permits.

Parametric Equivalents (Reduced Performance Envelope): Parts that share the same transistor type (PNP), voltage rating (60 V), and mounting technology (Through Hole) but operate within a reduced current and power specification envelope. These parts are suitable for applications where the full current and power capabilities of the ZXTP2012A are not required.

The following key parameters determine substitution eligibility:

Transistor Type: PNP
Voltage - Collector Emitter Breakdown (Max): 60 V minimum
Mounting Type: Through Hole
Package Compatibility: E-Line or TO-92 compatible form factors

Parameter Comparison

Parameter	ZXTP2012A (Bulk)	ZXTP2012ASTZ (Cut Tape)	KSA708YBU (Fairchild)
Manufacturer	Diodes Incorporated	Diodes Incorporated	Fairchild Semiconductor
Transistor Type	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	60 V
Current - Collector (Ic) (Max)	3.5 A	3.5 A	700 mA
Power - Max	1 W	1 W	800 mW
Frequency - Transition	120 MHz	120 MHz	50 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1A, 1V	100 @ 1A, 1V	120 @ 50mA, 2V
Vce Saturation (Max) @ Ib, Ic	210mV @ 400mA, 4A	210mV @ 400mA, 4A	700mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	20 nA	20 nA	100 nA
Operating Temperature Range	-55 to 150 °C (TJ)	-55 to 150 °C (TJ)	Up to 150 °C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	E-Line-3	E-Line-3, Formed Leads	TO-226-3, TO-92-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified
Product Status	Active	Active	Active

Engineering Selection Recommendations

ZXTP2012ASTZ (Diodes Incorporated): This part is a direct substitute for ZXTP2012A, differing only in packaging format (Cut Tape versus Bulk). Both parts are manufactured by Diodes Incorporated, share identical electrical specifications, and maintain ROHS3 compliance. Selection of ZXTP2012ASTZ is appropriate when tape-and-reel packaging is required for automated assembly processes or when bulk packaging is unavailable. The formed leads variant accommodates standard pick-and-place equipment.

KSA708YBU (Fairchild Semiconductor): This part is a parametric equivalent suitable for applications where the full current and power capabilities of the ZXTP2012A are not required. The KSA708YBU operates at reduced maximum collector current (700 mA versus 3.5 A) and power dissipation (800 mW versus 1 W), with lower transition frequency (50 MHz versus 120 MHz). The part maintains the 60 V voltage rating and PNP transistor type. Selection of KSA708YBU is appropriate for low-current switching applications and where Fairchild Semiconductor sourcing is preferred. RoHS compliance status for KSA708YBU is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can ZXTP2012ASTZ be used as a direct replacement for ZXTP2012A in existing designs?

A: Yes. ZXTP2012ASTZ is a direct electrical equivalent with identical specifications. The difference is packaging format: ZXTP2012A is supplied in Bulk, while ZXTP2012ASTZ is supplied in Cut Tape with formed leads. Both are manufactured by Diodes Incorporated and are ROHS3 compliant. Mechanical compatibility depends on the assembly process; tape-and-reel format is suitable for automated assembly, while bulk format is suitable for manual or wave soldering processes.

Q: Under what conditions can KSA708YBU substitute for ZXTP2012A?

A: KSA708YBU can substitute for ZXTP2012A only in applications where the collector current requirement does not exceed 700 mA and power dissipation does not exceed 800 mW. Both parts share the same 60 V voltage rating, PNP transistor type, and Through Hole mounting technology. Applications requiring the full 3.5 A current capability or 1 W power dissipation of the ZXTP2012A cannot use KSA708YBU. The lower transition frequency (50 MHz versus 120 MHz) may also limit suitability in high-frequency switching applications.

Q: Are all substitute parts pin-compatible with ZXTP2012A?

A: ZXTP2012A and ZXTP2012ASTZ are pin-compatible, both using the E-Line-3 package (TO-92 compatible). KSA708YBU uses TO-92-3 package, which is mechanically and electrically compatible with E-Line-3 for Through Hole applications. Pin assignment follows standard PNP transistor configuration (Base, Collector, Emitter). Physical lead spacing and hole diameter compatibility should be verified for the specific PCB design.

Q: What is the difference between ZXTP2012A and ZXTP2012ASTZ beyond packaging?

A: The parts are electrically identical. ZXTP2012A is supplied in Bulk packaging, while ZXTP2012ASTZ is supplied in Cut Tape format with formed leads. Both share the same base product number (ZXTP2012), manufacturer (Diodes Incorporated), and specifications. The formed leads on ZXTP2012ASTZ are designed for automated tape-and-reel handling systems.

Q: Is RoHS compliance maintained across all substitute parts?

A: ZXTP2012A and ZXTP2012ASTZ are both ROHS3 compliant. RoHS compliance status for KSA708YBU is not specified in available documentation. Verification of RoHS compliance for KSA708YBU should be obtained from Fairchild Semiconductor if regulatory compliance is required for the application.

Q: What are the key electrical differences between ZXTP2012A and KSA708YBU?

A: The primary differences are maximum collector current (3.5 A versus 700 mA), maximum power dissipation (1 W versus 800 mW), transition frequency (120 MHz versus 50 MHz), and saturation voltage characteristics. Both parts maintain 60 V voltage rating and PNP transistor type. The KSA708YBU is classified as a small-signal transistor, while ZXTP2012A supports higher current applications.

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