ZX5T949ZTA Equivalent & Substitute Parts

Part Overview

The ZX5T949ZTA is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 30 V collector-emitter breakdown voltage and 5.5 A maximum collector current. This surface mount device in SOT-89-3 packaging delivers 2.1 W maximum power dissipation with a transition frequency of 110 MHz. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Collector (Ic) (Max)	5.5 A
Power - Max	2.1 W
Frequency - Transition	110 MHz
Vce Saturation (Max)	175 mV @ 500 mA, 5.5 A
DC Current Gain (hFE) (Min)	100 @ 1 A, 1 V
Mounting Type	Surface Mount
Package / Case	TO-243AA
Supplier Device Package	SOT-89-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZX5T949ZTA is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be PNP
Collector-emitter breakdown voltage must be 30 V or greater
Maximum collector current must be 5.5 A or greater
Maximum power dissipation must be 2.1 W or greater
Transition frequency must support 110 MHz operation or higher

Mechanical Compatibility Requirements:

Surface mount mounting type
TO-243AA package / case
SOT-89 or SOT-89-3 supplier device package

Compliance Requirements:

ROHS3 compliance
Moisture sensitivity level 1 (unlimited)

Substitute parts are grouped into two categories: parametric equivalents (matching all electrical and mechanical specifications) and manufacturer-recommended alternatives (meeting minimum electrical requirements with potential variations in secondary parameters).

Parameter Comparison

Parameter	ZX5T949ZTA	ZXTP2008ZTA	2SAR542PT100	PBSS303PX,115	PBSS4032PX,115
Manufacturer	Diodes Incorporated	Diodes Incorporated	Rohm Semiconductor	Nexperia USA Inc.	Nexperia USA Inc.
Transistor Type	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	30 V	30 V	30 V
Current - Collector (Ic) (Max)	5.5 A	5.5 A	5 A	5.1 A	4.2 A
Power - Max	2.1 W	2.1 W	2 W	2.1 W	2.5 W
Frequency - Transition	110 MHz	110 MHz	240 MHz	130 MHz	115 MHz
Vce Saturation (Max)	175 mV @ 500 mA, 5.5 A	175 mV @ 500 mA, 5.5 A	400 mV @ 100 mA, 5 A	230 mV @ 255 mA, 5.1 A	400 mV @ 200 mA, 4 A
DC Current Gain (hFE) (Min)	100 @ 1 A, 1 V	100 @ 1 A, 1 V	200 @ 500 mA, 2 V	200 @ 2 A, 2 V	150 @ 2 A, 2 V
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89-3	SOT-89-3	MPT3	SOT-89	SOT-89
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

ZXTP2008ZTA (Diodes Incorporated)

This part is a parametric equivalent to the ZX5T949ZTA, matching all electrical specifications and package requirements. The ZXTP2008ZTA is in active product status, ensuring long-term availability and supply chain continuity. Both parts share identical maximum ratings for collector current (5.5 A), collector-emitter breakdown voltage (30 V), power dissipation (2.1 W), transition frequency (110 MHz), and saturation voltage characteristics. The ZXTP2008ZTA is supplied in tape and reel packaging and maintains ROHS3 compliance. This substitute is the primary choice for direct replacement in existing designs.

2SAR542PT100 (Rohm Semiconductor)

This manufacturer-recommended alternative meets the minimum electrical requirements with a 30 V breakdown voltage and 5 A collector current rating. The part exceeds the transition frequency requirement at 240 MHz and maintains ROHS3 compliance. The 2SAR542PT100 exhibits higher saturation voltage (400 mV) and higher DC current gain (200 @ 500 mA, 2 V) compared to the original part. This substitute is suitable for applications where the reduced collector current rating (5 A versus 5.5 A) and different saturation characteristics are acceptable within circuit design margins.

PBSS303PX,115 (Nexperia USA Inc.)

This manufacturer-recommended alternative provides a 30 V breakdown voltage and 5.1 A collector current rating, closely matching the original specification. The PBSS303PX,115 operates at 130 MHz transition frequency and maintains 2.1 W power dissipation. This part carries automotive-grade qualification (AEC-Q100) and ROHS3 compliance. The saturation voltage is 230 mV, intermediate between the original part and other alternatives. This substitute is appropriate for applications requiring automotive-grade components or where the higher DC current gain (200 @ 2 A, 2 V) is beneficial.

PBSS4032PX,115 (Nexperia USA Inc.)

This manufacturer-recommended alternative provides a 30 V breakdown voltage with a reduced collector current rating of 4.2 A. The PBSS4032PX,115 operates at 115 MHz transition frequency and offers increased power dissipation capability at 2.5 W. This part carries automotive-grade qualification (AEC-Q100) and ROHS3 compliance. The saturation voltage is 400 mV, and DC current gain is 150 @ 2 A, 2 V. This substitute is suitable for applications where the lower collector current requirement and higher power dissipation capability are compatible with circuit design specifications.

Frequently Asked Questions (FAQ)

Q: Can ZXTP2008ZTA be used as a direct replacement for ZX5T949ZTA?

A: Yes. The ZXTP2008ZTA is a parametric equivalent with identical electrical specifications and package configuration. Both parts are PNP transistors with 30 V breakdown voltage, 5.5 A maximum collector current, 2.1 W power dissipation, and 110 MHz transition frequency. The ZXTP2008ZTA is in active product status, making it the recommended direct replacement.

Q: What is the difference between SOT-89-3 and SOT-89 packaging?

A: Both designations refer to the same physical package form factor (TO-243AA). The SOT-89-3 and SOT-89 designations are supplier-specific nomenclature for the three-lead surface mount package. Parts specified with either designation are mechanically and electrically compatible in the same PCB footprint.

Q: Why does 2SAR542PT100 have a lower collector current rating (5 A) than the original part (5.5 A)?

A: The 2SAR542PT100 is rated for 5 A maximum collector current, which is 0.5 A lower than the ZX5T949ZTA specification. This part remains a valid substitute if the circuit design operates at or below 5 A collector current. Circuit designers must verify that the maximum current requirement does not exceed 5 A for this alternative.

Q: Are the Nexperia parts (PBSS303PX,115 and PBSS4032PX,115) suitable for non-automotive applications?

A: Yes. Automotive-grade components with AEC-Q100 qualification meet or exceed the reliability and performance standards required for general industrial and consumer applications. The automotive qualification indicates enhanced testing and quality assurance, making these parts suitable for any application requiring the specified electrical characteristics.

Q: What is the significance of the DC Current Gain (hFE) differences among substitute parts?

A: DC current gain variations affect the base current required to achieve a specified collector current. The original ZX5T949ZTA has a minimum hFE of 100 @ 1 A, 1 V, while substitute parts range from 100 to 200 at different test conditions. Circuit designs using these parts must account for hFE variations in base drive calculations. Higher hFE values require less base current for the same collector current.

Q: Can PBSS4032PX,115 be used in applications requiring 5.5 A collector current?

A: No. The PBSS4032PX,115 is rated for a maximum collector current of 4.2 A, which is below the 5.5 A requirement of the original part. This substitute is only suitable for applications where the maximum collector current does not exceed 4.2 A.

Q: What compliance certifications are common to all substitute parts?

A: All substitute parts listed maintain ROHS3 compliance and moisture sensitivity level 1 (unlimited). The Nexperia parts (PBSS303PX,115 and PBSS4032PX,115) additionally carry AEC-Q100 automotive qualification. All parts are classified as REACH unaffected or REACH affected, with EAR99 export classification.

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