ZTX758 Equivalent & Substitute Parts

Part Overview

The ZTX758 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 400 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 1 W power dissipation capability. The ZTX758 is suitable for applications requiring moderate voltage and current handling in compact form factors. Equivalent and substitute parts are identified for applications where design flexibility, inventory availability, or specific parameter requirements necessitate alternative component selection within compatible electrical and mechanical specifications.

Key Parameters

Parameter	ZTX758 Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	400	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	1	W
Frequency - Transition	50	MHz
Mounting Type	Through Hole	—
Package / Case	E-Line-3 (TO-92 compatible)	—
Operating Temperature Range	-55 to 200	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ZTX758 is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: PNP configuration required
Mounting Type: Through Hole required
Package Compatibility: E-Line-3 or TO-92-3 form factors
Voltage Rating: Minimum 400 V collector-emitter breakdown voltage
Current Rating: Minimum 500 mA collector current capacity
Power Dissipation: Minimum 1 W capability

Secondary Compatibility Factors:

Frequency - Transition: 50 MHz or higher
Operating Temperature Range: Support for -55°C minimum and 200°C maximum
RoHS and REACH Compliance: ROHS3 Compliant and REACH Unaffected status

The ZTX558 qualifies as a direct manufacturer-recommended substitute from Diodes Incorporated with identical voltage and package specifications, though with reduced maximum collector current (200 mA). The 2N6520TA, KSP92BU, and MPSA92 PBFREE are alternative substitutes with reduced voltage ratings (300–350 V) and power dissipation (625 mW), suitable for applications not requiring the full 400 V rating of the ZTX758.

Parameter Comparison

Parameter	ZTX758	ZTX558	2N6520TA	KSP92BU	MPSA92 PBFREE
Manufacturer	Diodes Incorporated	Diodes Incorporated	onsemi	Fairchild Semiconductor	Central Semiconductor Corp
Transistor Type	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	350 V	300 V	300 V
Current - Collector (Ic) (Max)	500 mA	200 mA	500 mA	500 mA	500 mA
Power - Max	1 W	1 W	625 mW	625 mW	625 mW
Frequency - Transition	50 MHz	50 MHz	200 MHz	50 MHz	50 MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	E-Line-3	E-Line-3	TO-92-3	TO-92-3	TO-92-3
Operating Temperature (Max)	200°C	200°C	150°C	150°C	150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	Not Specified	REACH Unaffected

Engineering Selection Recommendations

ZTX558 (Diodes Incorporated): This is the manufacturer-recommended substitute from the same product family. It maintains identical voltage rating (400 V), power dissipation (1 W), frequency response (50 MHz), and operating temperature range (-55°C to 200°C). The ZTX558 is suitable for applications where collector current requirements do not exceed 200 mA. Both devices carry ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original ZTX758.

2N6520TA (onsemi): This substitute operates at reduced voltage (350 V) and power (625 mW) but maintains 500 mA collector current capacity and Through Hole TO-92-3 packaging. The 2N6520TA features higher transition frequency (200 MHz) and is suitable for applications operating below 350 V. Operating temperature maximum is limited to 150°C. ROHS3 compliance and REACH Unaffected status are maintained.

KSP92BU (Fairchild Semiconductor): This device operates at 300 V with 625 mW power dissipation and 500 mA collector current. The KSP92BU is compatible with TO-92-3 packaging and 50 MHz frequency response. Operating temperature maximum is 150°C. This substitute is appropriate for lower-voltage applications not requiring the full 400 V rating of the ZTX758.

MPSA92 PBFREE (Central Semiconductor Corp): This substitute provides 300 V voltage rating, 625 mW power dissipation, and 500 mA collector current in TO-92-3 packaging. The MPSA92 PBFREE supports operating temperatures from -65°C to 150°C and carries ROHS3 compliance and REACH Unaffected status. This device is suitable for applications with reduced voltage and power requirements.

Frequently Asked Questions (FAQ)

Q: Can the ZTX558 replace the ZTX758 in all applications?

A: The ZTX558 is suitable for applications where the maximum collector current requirement does not exceed 200 mA. Both devices share identical voltage rating (400 V), power dissipation (1 W), frequency response (50 MHz), and operating temperature range (-55°C to 200°C). Applications requiring the full 500 mA collector current capacity of the ZTX758 require alternative substitutes such as the 2N6520TA, KSP92BU, or MPSA92 PBFREE.

Q: What are the voltage limitations of the 2N6520TA, KSP92BU, and MPSA92 PBFREE substitutes?

A: The 2N6520TA operates at a maximum collector-emitter breakdown voltage of 350 V. The KSP92BU and MPSA92 PBFREE both operate at 300 V maximum. These substitutes are not suitable for applications requiring the full 400 V rating of the ZTX758. Selection of these alternatives requires confirmation that circuit operating voltages remain below their respective maximum ratings.

Q: Are all substitute parts physically compatible with the ZTX758 footprint?

A: The ZTX758 uses E-Line-3 packaging (TO-92 compatible). The ZTX558 shares identical E-Line-3 packaging. The 2N6520TA, KSP92BU, and MPSA92 PBFREE use TO-92-3 packaging, which is mechanically compatible with TO-92 footprints. Physical verification of lead spacing and hole alignment is required for board-level integration.

Q: What is the maximum operating temperature difference between the ZTX758 and substitute parts?

A: The ZTX758 and ZTX558 support operating temperatures up to 200°C. The 2N6520TA, KSP92BU, and MPSA92 PBFREE are limited to 150°C maximum operating temperature. Applications requiring operation above 150°C require the ZTX758 or ZTX558.

Q: Do all substitute parts meet RoHS and REACH compliance requirements?

A: The ZTX758, ZTX558, 2N6520TA, and MPSA92 PBFREE are ROHS3 Compliant and REACH Unaffected. The KSP92BU compliance status is not specified in available documentation. Regulatory compliance verification is required for the KSP92BU in applications subject to RoHS or REACH requirements.

Q: Which substitute provides the highest frequency response?

A: The 2N6520TA features a transition frequency of 200 MHz, compared to 50 MHz for the ZTX758, ZTX558, KSP92BU, and MPSA92 PBFREE. The 2N6520TA is suitable for higher-frequency applications within its voltage and power limitations.

Q: Can the MPSA92 PBFREE operate at lower temperatures than the ZTX758?

A: The MPSA92 PBFREE supports operating temperatures from -65°C to 150°C, extending the minimum temperature capability to -65°C compared to the ZTX758 minimum of -55°C. The MPSA92 PBFREE is suitable for cryogenic or extended low-temperature applications within its voltage and power specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message