MPS6534_D26Z Equivalent & Substitute Parts

Part Overview

The MPS6534_D26Z is a PNP bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 800 mA maximum collector current in a TO-92-3 through-hole package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The MPS6534_D26Z remains available in inventory (934 pcs), but obsolete status necessitates identification of active alternative components with compatible electrical and mechanical characteristics.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	800	mA
Power - Max	625	mW
Vce Saturation (Max)	300 mV @ 10 mA, 100 mA	—
DC Current Gain (hFE) (Min)	90 @ 100 mA, 1 V	—
Current - Collector Cutoff (Max)	50	nA
Operating Temperature Range	−55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the MPS6534_D26Z is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must equal or exceed 40 V
Maximum collector current must equal or exceed 800 mA
Maximum power dissipation must equal or exceed 625 mW
DC current gain (hFE) must meet or exceed 90 at specified operating conditions
Collector cutoff current must not exceed 50 nA

Mechanical Compatibility Criteria:

Mounting type must be through-hole
Package must be TO-92-compatible or equivalent form factor with formed leads
Operating temperature range must encompass −55°C to 150°C minimum

The substitute parts identified below meet these criteria within the constraints of their respective electrical ratings and package specifications.

Parameter Comparison

Parameter	MPS6534_D26Z	ZTX549	ZTX549STZ
Manufacturer	onsemi	Diodes Incorporated	Diodes Incorporated
Transistor Type	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	40 V	30 V	30 V
Current - Collector (Ic) (Max)	800 mA	1 A	1 A
Power - Max	625 mW	1 W	1 W
Vce Saturation (Max)	300 mV @ 10 mA, 100 mA	750 mV @ 200 mA, 2 A	750 mV @ 200 mA, 2 A
DC Current Gain (hFE) (Min)	90 @ 100 mA, 1 V	100 @ 500 mA, 2 V	100 @ 500 mA, 2 V
Current - Collector Cutoff (Max)	50 nA	100 nA	100 nA
Operating Temperature Range	−55 to 150 °C	−55 to 200 °C	−55 to 200 °C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	E-Line-3 (TO-92 compatible)	E-Line-3 (TO-92 compatible)
Product Status	Obsolete	Active	Active
Frequency - Transition	—	100 MHz	100 MHz

Engineering Selection Recommendations

ZTX549 and ZTX549STZ Suitability:

Both ZTX549 and ZTX549STZ are active products manufactured by Diodes Incorporated and are suitable substitutes for the obsolete MPS6534_D26Z in applications where the following conditions are met:

Voltage Rating Consideration: The ZTX549 series has a maximum collector-emitter breakdown voltage of 30 V, which is lower than the MPS6534_D26Z rating of 40 V. Substitution is appropriate only in circuits where the maximum applied collector-emitter voltage does not exceed 30 V.
Current and Power Ratings: Both ZTX549 variants exceed the MPS6534_D26Z specifications with 1 A maximum collector current and 1 W power dissipation, providing margin for design flexibility.
DC Current Gain: The ZTX549 series minimum hFE of 100 exceeds the MPS6534_D26Z minimum of 90, ensuring adequate amplification characteristics.
Temperature Range: The ZTX549 series operating temperature range of −55°C to 200°C encompasses the MPS6534_D26Z range of −55°C to 150°C.
Package Compatibility: Both ZTX549 variants are specified as E-Line (TO-92 compatible) with formed leads, providing mechanical compatibility with TO-92-3 footprints.
Compliance Status: Both ZTX549 variants are RoHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Packaging Distinction:

ZTX549 is supplied in bulk packaging, while ZTX549STZ is supplied in cut tape (CT) packaging. Selection between these variants depends on procurement and assembly requirements rather than electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ZTX549 directly replace the MPS6534_D26Z in all applications?

A: The ZTX549 is electrically compatible in applications where the maximum collector-emitter voltage does not exceed 30 V. The MPS6534_D26Z is rated for 40 V, so circuits designed to operate at voltages between 30 V and 40 V require verification that the lower voltage rating of the ZTX549 is acceptable. All other electrical parameters of the ZTX549 meet or exceed the MPS6534_D26Z specifications.

Q: What is the difference between ZTX549 and ZTX549STZ?

A: ZTX549 and ZTX549STZ are electrically and mechanically identical. The difference is in packaging format: ZTX549 is supplied in bulk packaging, while ZTX549STZ is supplied in cut tape (CT) format. Both are manufactured by Diodes Incorporated and have identical electrical characteristics, operating temperature ranges, and TO-92 compatible form factors.

Q: Are the ZTX549 variants physically compatible with TO-92-3 footprints?

A: Yes. Both ZTX549 and ZTX549STZ are specified as E-Line (TO-92 compatible) with formed leads. The physical dimensions and lead configuration are compatible with standard TO-92-3 through-hole PCB footprints.

Q: What compliance certifications apply to the ZTX549 substitutes?

A: Both ZTX549 and ZTX549STZ are RoHS3 compliant and REACH unaffected. These certifications meet current regulatory requirements for electronic components in most jurisdictions.

Q: Does the higher operating temperature range of the ZTX549 (−55°C to 200°C versus −55°C to 150°C) affect substitution?

A: No. The extended upper temperature limit of the ZTX549 (200°C versus 150°C) provides additional thermal margin and does not create compatibility issues. Applications designed for the MPS6534_D26Z operating range will function within the ZTX549 operating range.

Q: What is the significance of the 100 MHz transition frequency specified for the ZTX549?

A: The ZTX549 transition frequency of 100 MHz indicates the frequency at which the current gain begins to decrease. This parameter was not specified for the MPS6534_D26Z. For DC and low-frequency applications, this parameter is not a limiting factor. For applications requiring operation above 100 MHz, the ZTX549 frequency response must be evaluated against circuit requirements.

Q: Can I use the ZTX549 in a circuit designed for 40 V operation?

A: No. The ZTX549 maximum collector-emitter breakdown voltage is 30 V. Using it in a circuit designed for 40 V operation risks exceeding the device rating and causing failure. The circuit must be redesigned or verified to operate at 30 V or below.

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