DXTA42-13 Equivalent & Substitute Parts

Part Overview

The DXTA42-13 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This surface mount device operates at 300 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 1 W power dissipation capability. The part is currently in active production status with 2290 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain constraints, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	1	W
Frequency - Transition	50	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 30mA, 10V	—
Vce Saturation (Max) @ Ib, Ic	500mV @ 2mA, 20mA	—
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-243AA (SOT-89-3)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the DXTA42-13 is determined by the following critical parameters: transistor type (NPN), collector-emitter breakdown voltage (300 V minimum), maximum collector current (500 mA minimum), power dissipation (1 W minimum), transition frequency (50 MHz minimum), DC current gain (40 minimum at specified conditions), saturation voltage characteristics, package type (TO-243AA / SOT-89 variants), and surface mount compatibility.

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts that match or exceed all key electrical specifications and operate within the same voltage and current ranges with identical or superior performance characteristics.

Manufacturer Recommended Alternatives: Parts that may have variations in specific parameters (such as reduced maximum collector current, increased voltage rating, or enhanced frequency response) but remain functionally compatible within defined application boundaries. These alternatives are qualified by automotive standards (AEC-Q101) where applicable.

Parameter Comparison

Parameter	DXTA42-13	SXTA42TA	CXTA42 TR PBFREE	PXTA42,115	BF620,115	BST39,115
Manufacturer	Diodes Inc.	Diodes Inc.	Central Semi.	Nexperia USA	Nexperia USA	Nexperia USA
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Vce Breakdown (Max)	300 V	300 V	300 V	300 V	300 V	350 V
Ic (Max)	500 mA	500 mA	500 mA	100 mA	50 mA	100 mA
Power (Max)	1 W	1 W	1.2 W	1.3 W	1.1 W	1.3 W
Frequency - Transition	50 MHz	50 MHz	50 MHz	50 MHz	60 MHz	70 MHz
hFE (Min) @ Ic, Vce	40 @ 30mA, 10V	40 @ 30mA, 10V	40 @ 30mA, 10V	40 @ 30mA, 10V	50 @ 25mA, 20V	40 @ 20mA, 10V
Vce Saturation (Max)	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	600mV @ 5mA, 30mA	500mV @ 4mA, 50mA
Operating Temperature	-55 to 150°C	-65 to 150°C	-65 to 150°C	150°C (Max)	150°C (Max)	150°C (Max)
Package	TO-243AA (SOT-89-3)	TO-243AA (SOT-89-3)	TO-243AA (SOT-89)	TO-243AA (SOT-89)	TO-243AA (SOT-89)	TO-243AA (SOT-89)
Packaging Type	Tape & Reel	Tape & Reel	Tape & Reel	Tape & Reel	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	—	AEC-Q101	AEC-Q101	AEC-Q101
Inventory (Pcs)	2290	4200	2975	9436	1890	748

Engineering Selection Recommendations

Direct Parametric Equivalents:

SXTA42TA and CXTA42 TR PBFREE are direct parametric equivalents to the DXTA42-13. Both parts maintain identical electrical specifications across all critical parameters: 300 V breakdown voltage, 500 mA maximum collector current, 50 MHz transition frequency, and matching saturation voltage characteristics. SXTA42TA extends the operating temperature range to -65°C, providing enhanced low-temperature performance. CXTA42 TR PBFREE offers increased power dissipation (1.2 W) and extended temperature range (-65 to 150°C). Both parts are ROHS3 compliant and available in surface mount packaging. Selection between these equivalents depends on inventory availability and specific temperature range requirements.

Reduced Current Alternatives:

PXTA42,115 and BF620,115 are suitable substitutes for applications where maximum collector current requirements are lower than 500 mA. PXTA42,115 supports 100 mA maximum collector current with 1.3 W power dissipation and maintains the 50 MHz transition frequency. BF620,115 supports 50 mA maximum collector current with 1.1 W power dissipation and 60 MHz transition frequency. Both parts carry AEC-Q101 automotive qualification. These alternatives are appropriate for low-current switching and amplification circuits where the full 500 mA capability of the DXTA42-13 is not required.

Enhanced Voltage Alternative:

BST39,115 provides a higher collector-emitter breakdown voltage of 350 V with 100 mA maximum collector current and 1.3 W power dissipation. The 70 MHz transition frequency exceeds the DXTA42-13 specification. This part is suitable for applications requiring higher voltage margins or operating in elevated voltage environments. AEC-Q101 automotive qualification is included.

All substitute parts maintain TO-243AA / SOT-89 package compatibility, surface mount capability, ROHS3 compliance, and unlimited moisture sensitivity level (MSL 1). Selection should be based on specific application current requirements, voltage margins, and automotive qualification needs.

Frequently Asked Questions (FAQ)

Q: Can SXTA42TA be used as a direct replacement for DXTA42-13?

A: Yes. SXTA42TA is a parametric equivalent with identical electrical specifications. The extended operating temperature range (-65 to 150°C versus -55 to 150°C) provides additional low-temperature capability. Both parts are ROHS3 compliant, surface mount compatible, and available in TO-243AA packaging.

Q: What is the difference between CXTA42 TR PBFREE and DXTA42-13?

A: CXTA42 TR PBFREE matches all critical electrical parameters of the DXTA42-13 with identical 300 V breakdown voltage, 500 mA collector current, and 50 MHz transition frequency. CXTA42 offers slightly higher power dissipation (1.2 W versus 1 W) and extended operating temperature range (-65 to 150°C). Both are surface mount, ROHS3 compliant devices in TO-243AA packaging.

Q: Can PXTA42,115 replace DXTA42-13 in all applications?

A: PXTA42,115 is suitable for applications where maximum collector current does not exceed 100 mA. The part maintains 300 V breakdown voltage, 50 MHz transition frequency, and identical saturation voltage characteristics. Applications requiring the full 500 mA capability of the DXTA42-13 require a full-current equivalent such as SXTA42TA or CXTA42 TR PBFREE.

Q: What is the advantage of BF620,115 over DXTA42-13?

A: BF620,115 provides 60 MHz transition frequency (versus 50 MHz) and carries AEC-Q101 automotive qualification. However, maximum collector current is limited to 50 mA. This part is suitable for low-current automotive applications where enhanced frequency response and automotive qualification are required.

Q: Is BST39,115 a suitable substitute for high-voltage applications?

A: BST39,115 provides 350 V collector-emitter breakdown voltage, exceeding the DXTA42-13 specification of 300 V. This higher voltage rating is appropriate for applications requiring voltage margin above 300 V. Maximum collector current is 100 mA, and the part includes AEC-Q101 automotive qualification and 70 MHz transition frequency.

Q: Are all substitute parts available in the same package as DXTA42-13?

A: All substitute parts use TO-243AA / SOT-89 surface mount packaging, maintaining mechanical and electrical compatibility with DXTA42-13 PCB layouts. Packaging format variations (Tape & Reel versus Cut Tape & Digi-Reel) do not affect component performance or pinout.

Q: Which substitute part has the highest inventory availability?

A: PXTA42,115 has the highest inventory with 9436 units in stock, followed by SXTA42TA with 4200 units and CXTA42 TR PBFREE with 2975 units. Selection based on inventory should be balanced against specific application current and voltage requirements.

Q: Do all substitute parts meet ROHS3 compliance?

A: Yes. All listed substitute parts (SXTA42TA, CXTA42 TR PBFREE, PXTA42,115, BF620,115, and BST39,115) are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

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