PZTA42 NPN Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The PZTA42 is an NPN bipolar junction transistor manufactured by onsemi in SOT-223 surface mount packaging. This device is rated for 300 V collector-emitter breakdown voltage, 500 mA maximum collector current, and 1 W power dissipation. The PZTA42 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging options.

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
Operating Temperature Range	-55 to 150	°C
Vce Saturation (Max) @ Ib, Ic	500 mV @ 2 mA, 20 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 30 mA, 10 V	—
Current - Collector Cutoff (Max)	100	nA
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the PZTA42 are classified into three categories based on electrical and mechanical compatibility:

Direct Manufacturer Substitutes maintain identical or superior electrical specifications with active product status. These parts share the same base product number (PZTA42) and are manufactured by onsemi or Infineon Technologies. Substitution is based on matching or exceeding the following critical parameters: collector-emitter breakdown voltage (300 V minimum), maximum collector current (500 mA), saturation voltage characteristics, DC current gain, and transition frequency. Power dissipation may be equal or higher. Package compatibility includes SOT-223 (TO-261) variants.

Similar Manufacturer Parts provide functional equivalence with variations in current rating or package type. These parts maintain the 300 V breakdown voltage and 50 MHz transition frequency but may differ in maximum collector current (100 mA versus 500 mA) or use alternative surface mount packages (SOT-89). These parts are suitable for applications with reduced current requirements.

Parametric Equivalent Parts offer electrical compatibility with minor specification variations. The DZTA42-13 maintains all critical electrical parameters but uses a three-pin SOT-223 package configuration instead of four-pin, and extends the lower operating temperature limit to -65°C.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce(br) V	Power W	Frequency MHz	Package	Operating Temp °C
PZTA42	onsemi	Obsolete	500	300	1.0	50	SOT-223-4	-55 to 150
PZTA42T1G	onsemi	Active	500	300	1.5	50	SOT-223	-55 to 150
SPZTA42T1G	onsemi	Active	500	300	1.5	50	SOT-223	Not specified
PZTA42H6327XTSA1	Infineon Technologies	Last Time Buy	500	300	1.5	70	PG-SOT223-4	-55 to 150
PXTA42,115	Nexperia USA Inc.	Active	100	300	1.3	50	SOT-89	-55 to 150
PZTA42,115	Nexperia USA Inc.	Active	100	300	1.2	50	SOT-223	-55 to 150
ZXTN08400BFFTA	Diodes Incorporated	Active	500	400	1.5	40	SOT-23F	-55 to 150
DZTA42-13	Diodes Incorporated	Active	500	300	1.0	50	SOT-223-3	-65 to 150

Engineering Selection Recommendations

Primary Substitutes for Direct Replacement:

PZTA42T1G (onsemi) is the recommended direct substitute. This part maintains identical electrical specifications to the PZTA42 while offering active product status, higher power dissipation (1.5 W versus 1.0 W), and equivalent packaging. Both parts are ROHS3 compliant with MSL 1 rating and identical thermal characteristics.

PZTA42H6327XTSA1 (Infineon Technologies) provides an alternative with enhanced transition frequency (70 MHz versus 50 MHz) and active-equivalent status (Last Time Buy). This part is suitable for applications requiring higher frequency performance within the same voltage and current envelope.

Substitutes for Current-Limited Applications:

PZTA42,115 (Nexperia USA Inc.) is suitable for applications requiring maximum 100 mA collector current. This part maintains the 300 V breakdown voltage and SOT-223 package compatibility. AEC-Q101 automotive qualification is available with this variant.

PXTA42,115 (Nexperia USA Inc.) provides 100 mA current rating in SOT-89 packaging. This part is qualified to AEC-Q101 automotive standards and maintains the 300 V voltage specification.

Parametric Equivalent:

DZTA42-13 (Diodes Incorporated) offers electrical equivalence with extended lower operating temperature (-65°C minimum) and uses a three-pin SOT-223 package configuration. This part is suitable for applications requiring the same electrical performance with modified pinout requirements.

Higher Voltage Alternative:

ZXTN08400BFFTA (Diodes Incorporated) provides 400 V collector-emitter breakdown voltage with 500 mA current capability. This part is suitable for applications requiring higher voltage margin. Transition frequency is reduced to 40 MHz, and package is SOT-23F (three flat leads).

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and EAR99 export classification consistent with the original PZTA42.

Frequently Asked Questions (FAQ)

Q: Can PZTA42T1G directly replace PZTA42 in existing designs?

A: Yes. PZTA42T1G maintains identical electrical specifications for voltage (300 V), current (500 mA), saturation voltage, DC current gain, and transition frequency (50 MHz). Both use SOT-223 packaging. The substitute offers higher power dissipation (1.5 W versus 1.0 W), which provides additional thermal margin. Active product status makes PZTA42T1G the preferred replacement for obsolete PZTA42.

Q: What is the difference between PZTA42T1G and SPZTA42T1G?

A: Both parts share identical electrical specifications: 500 mA collector current, 300 V breakdown voltage, 1.5 W power dissipation, and 50 MHz transition frequency. SPZTA42T1G has lower inventory availability (4,200 units versus 113,300 units) and does not specify operating temperature range. PZTA42T1G is the preferred choice due to documented thermal specifications and higher availability.

Q: Can I use PZTA42,115 or PXTA42,115 as substitutes?

A: These parts are suitable only for applications with maximum 100 mA collector current requirement, compared to the original 500 mA specification. Both maintain 300 V breakdown voltage and 50 MHz transition frequency. PZTA42,115 uses SOT-223 packaging (compatible with original), while PXTA42,115 uses SOT-89 packaging. Both are AEC-Q101 qualified automotive parts.

Q: What is the advantage of PZTA42H6327XTSA1?

A: This Infineon part offers 70 MHz transition frequency compared to the original 50 MHz, providing enhanced high-frequency performance. Electrical specifications for voltage (300 V), current (500 mA), and power (1.5 W) are equivalent. Product status is Last Time Buy, indicating limited future availability.

Q: When should I use ZXTN08400BFFTA instead of PZTA42T1G?

A: ZXTN08400BFFTA is selected when applications require higher voltage margin. This part provides 400 V collector-emitter breakdown voltage versus 300 V. However, transition frequency is reduced to 40 MHz, and package is SOT-23F (three flat leads) instead of SOT-223. Use this substitute only when higher voltage specification is a design requirement.

Q: Is DZTA42-13 a pin-compatible replacement?

A: DZTA42-13 uses a three-pin SOT-223 package configuration, whereas PZTA42 uses four-pin SOT-223. Electrical specifications are equivalent (300 V, 500 mA, 50 MHz). This part is suitable for designs where three-pin configuration is acceptable and extended lower operating temperature (-65°C) is beneficial.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, MSL 1 moisture sensitivity rating, and REACH unaffected status, consistent with the original PZTA42 specification.

Q: What packaging options are available for substitutes?

A: Direct substitutes use SOT-223 (TO-261) four-pin or three-pin configurations. PXTA42,115 uses SOT-89 (TO-243AA) for reduced current applications. ZXTN08400BFFTA uses SOT-23F (three flat leads) for higher voltage applications. Verify PCB layout compatibility before selection.

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