ZTX757 Equivalent & Substitute Parts

Part Overview

The ZTX757 is an active PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This through-hole component operates at 300 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 1 W power dissipation capability. The ZTX757 is packaged in the E-Line (TO-92 compatible) configuration and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	500	mA
Voltage - Collector Emitter Breakdown (Max)	300	V
Power - Max	1	W
Frequency - Transition	30	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 ZTX757 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor polarity: PNP type required
Collector current rating: 500 mA minimum
Collector-emitter breakdown voltage: 300 V minimum
Mounting configuration: Through-hole package
Physical form factor: TO-92 or E-Line compatible pinout

Acceptable Variation Parameters:

Power dissipation: Equal to or greater than 1 W
Transition frequency: Equal to or greater than 30 MHz
Operating temperature maximum: Equal to or greater than 150°C
DC current gain (hFE): Variations acceptable within application-specific requirements
Saturation voltage: Variations acceptable within application-specific requirements

All substitute parts listed maintain PNP polarity, 500 mA collector current capability, and through-hole mounting in TO-92-compatible packages. Voltage ratings of 300 V or higher satisfy the ZTX757 specification. Parts are grouped based on these core electrical and mechanical compatibility criteria.

Parameter Comparison

Parameter	ZTX757 (Diodes)	2N6520TA (onsemi)	KSP92BU (Fairchild)	MPSA92 PBFREE (Central Semi)
Transistor Type	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	500 mA	500 mA	500 mA	500 mA
Voltage - Collector Emitter Breakdown (Max)	300 V	350 V	300 V	300 V
Vce Saturation (Max)	500 mV @ 10 mA, 100 mA	1 V @ 5 mA, 50 mA	500 mV @ 2 mA, 20 mA	500 mV @ 2 mA, 20 mA
Current - Collector Cutoff (Max)	100 nA	50 nA	250 nA	250 nA
DC Current Gain (hFE) Min	50 @ 100 mA, 5 V	20 @ 50 mA, 10 V	25 @ 30 mA, 10 V	25 @ 30 mA, 10 V
Power - Max	1 W	625 mW	625 mW	625 mW
Frequency - Transition	30 MHz	200 MHz	50 MHz	50 MHz
Operating Temperature (Max)	200°C	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	E-Line-3 (TO-92 compatible)	TO-92-3	TO-92-3	TO-92-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

2N6520TA (onsemi): This part exceeds the ZTX757 specification in collector-emitter breakdown voltage (350 V vs. 300 V) and transition frequency (200 MHz vs. 30 MHz). The 2N6520TA is ROHS3 compliant and maintains active product status. Power dissipation is reduced to 625 mW, which represents a constraint for applications requiring the full 1 W capability of the ZTX757. This part is suitable for applications where higher voltage margin and frequency performance are beneficial.

KSP92BU (Fairchild Semiconductor): This part matches the ZTX757 in collector-emitter breakdown voltage (300 V) and collector current (500 mA). Transition frequency is increased to 50 MHz. Power dissipation is 625 mW. RoHS compliance status is not specified in the provided data. This part maintains active product status and is suitable for direct substitution in applications not requiring the full 1 W power capability.

MPSA92 PBFREE (Central Semiconductor Corp): This part matches the ZTX757 in collector-emitter breakdown voltage (300 V) and collector current (500 mA). Transition frequency is 50 MHz. Power dissipation is 625 mW. The MPSA92 PBFREE is ROHS3 compliant with active product status. Operating temperature range extends to -65°C, providing broader low-temperature capability than the ZTX757. This part is suitable for direct substitution in applications not requiring the full 1 W power capability.

All substitute parts maintain through-hole mounting in TO-92-compatible packages and preserve PNP polarity. Selection among substitutes depends on application-specific requirements for power dissipation, frequency response, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 2N6520TA replace the ZTX757 in all applications?

A: The 2N6520TA is electrically compatible for applications requiring PNP switching or amplification at 500 mA and 300 V or lower. However, the 2N6520TA power dissipation is limited to 625 mW compared to the ZTX757 1 W rating. Applications requiring sustained 1 W power dissipation must verify that the 2N6520TA thermal performance is adequate for the specific circuit design.

Q: What is the difference between the E-Line-3 package and TO-92-3 package?

A: The ZTX757 uses E-Line-3 packaging, which is mechanically compatible with TO-92 pinout configuration. The substitute parts use TO-92-3 designation. Both package types are through-hole, three-lead configurations with identical pinout compatibility. Physical dimensions and lead spacing are compatible for direct board-level substitution.

Q: Are all substitute parts RoHS3 compliant?

A: The ZTX757, 2N6520TA, and MPSA92 PBFREE are confirmed ROHS3 compliant. The KSP92BU RoHS compliance status is not specified in the provided technical data. Verification with the component supplier is required if RoHS3 compliance is a mandatory requirement.

Q: Which substitute part has the highest operating temperature rating?

A: The ZTX757 has the highest maximum operating temperature at 200°C. All substitute parts are rated to 150°C maximum. Applications requiring operation above 150°C must use the ZTX757 or identify alternative components with higher temperature ratings.

Q: Can the MPSA92 PBFREE be used in low-temperature applications?

A: The MPSA92 PBFREE operating temperature range extends to -65°C, compared to the ZTX757 minimum of -55°C. The MPSA92 PBFREE is suitable for applications requiring extended low-temperature operation.

Q: What is the significance of the transition frequency difference between these parts?

A: The ZTX757 has a 30 MHz transition frequency. The 2N6520TA operates at 200 MHz, while KSP92BU and MPSA92 PBFREE operate at 50 MHz. Higher transition frequency indicates faster switching capability. Applications operating at frequencies below 30 MHz are compatible with all listed parts. Applications requiring frequencies between 30 MHz and 50 MHz require KSP92BU or MPSA92 PBFREE. Applications requiring frequencies above 50 MHz require the 2N6520TA.

Q: Is the DC current gain (hFE) difference significant for substitution?

A: The ZTX757 specifies hFE minimum of 50 at 100 mA and 5 V. Substitute parts specify hFE minimum of 20 to 25 at different test conditions. Lower hFE values require higher base current to achieve the same collector current. Circuit designs using the ZTX757 must verify that base drive circuits can supply adequate current for substitute parts with lower hFE ratings.

Q: What inventory levels are available for each part?

A: ZTX757 has 9,430 pieces in stock. 2N6520TA has 4,580 pieces. KSP92BU has 105,400 pieces. MPSA92 PBFREE has 8,547 pieces. Inventory levels are subject to change and should be verified at time of procurement.

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