FZTA42TC Equivalent & Substitute Parts

Part Overview

The FZTA42TC is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features a 300 V collector-emitter breakdown voltage, 500 mA maximum collector current, and 2 W power dissipation capability in a surface mount SOT-223-3 package. The FZTA42TC is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	300	V
Collector Current (Max)	500	mA
Power Dissipation (Max)	2	W
Transition Frequency	50	MHz
DC Current Gain (hFE Min)	40	@ 30mA, 10V
Vce Saturation (Max)	500	mV @ 2mA, 20mA
Mounting Type	Surface Mount	—
Package	SOT-223-3	—
Operating Temperature Range	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FZTA42TC is determined by strict electrical and mechanical parameter matching within the NPN bipolar transistor category. The critical parameters governing substitution are:

Primary Matching Criteria:

Transistor type: NPN
Collector-emitter breakdown voltage: 300 V minimum
Collector current rating: 500 mA minimum
Power dissipation: 2 W minimum
Vce saturation: 500 mV @ 2mA, 20mA
DC current gain (hFE): 40 minimum @ 30mA, 10V
Package compatibility: SOT-223 series (TO-261-4, TO-261AA)
Surface mount configuration

Substitute parts are categorized into three groups:

Group 1: Direct Electrical Equivalents (Full Parameter Match) Parts meeting all primary matching criteria with identical or superior electrical specifications and active product status.

Group 2: Functional Equivalents (Reduced Current Rating) Parts with matching voltage and saturation characteristics but reduced collector current rating (100 mA vs. 500 mA), suitable for lower-current applications.

Group 3: Parametric Equivalents (Identical Specifications) Parts with complete parameter alignment including power dissipation, current rating, and voltage specifications.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power W	Frequency MHz	hFE Min	Vce Sat mV	Package	Status
FZTA42TC	Diodes Inc.	500	300	2	50	40	500	SOT-223-3	Obsolete
DZTA42-13	Diodes Inc.	500	300	1	50	40	500	SOT-223-3	Active
PZTA42H6327XTSA1	Infineon	500	300	1.5	70	40	500	PG-SOT223-4	Last Time Buy
PZTA42T1G	onsemi	500	300	1.5	50	40	500	SOT-223	Active
SPZTA42T1G	onsemi	500	300	1.5	50	40	500	SOT-223	Active
BF720,115	Nexperia	100	300	1.2	60	50	600	SOT-223	Active
BF720T1G	onsemi	100	300	1.5	60	50	600	SOT-223	Active
BSP19,115	Nexperia	100	350	1.2	70	40	500	SOT-223	Active
PZTA42,115	Nexperia	100	300	1.2	50	40	500	SOT-223	Active
CZTA42 TR PBFREE	Central Semiconductor	500	300	2	50	40	500	SOT-223	Active

Engineering Selection Recommendations

Primary Recommendation: CZTA42 TR PBFREE

The CZTA42 TR PBFREE manufactured by Central Semiconductor Corp provides complete electrical and mechanical equivalence to the FZTA42TC. This part maintains identical specifications across all critical parameters: 500 mA collector current, 300 V breakdown voltage, 2 W power dissipation, 50 MHz transition frequency, and 500 mV saturation voltage. The device is RoHS3 compliant, carries unlimited moisture sensitivity level (MSL 1), and maintains active product status with 3,359 units in stock. The SOT-223 package is directly compatible with the original SOT-223-3 footprint.

Secondary Recommendation: PZTA42T1G

The PZTA42T1G from onsemi serves as a functional equivalent with 500 mA collector current and 300 V breakdown voltage. While power dissipation is reduced to 1.5 W (versus 2 W), this device meets all saturation and gain specifications. The part is actively manufactured with 113,300 units in stock, ensuring long-term availability. Operating temperature range extends to -65°C, providing enhanced low-temperature performance. This option is suitable for applications where the 2 W power rating is not fully utilized.

Tertiary Recommendation: SPZTA42T1G

The SPZTA42T1G from onsemi provides identical electrical specifications to PZTA42T1G with 500 mA collector current and 1.5 W power dissipation. This variant maintains active status with 4,200 units available. Selection between PZTA42T1G and SPZTA42T1G depends on specific procurement and supply chain requirements.

Alternative for Reduced Current Applications: BF720T1G

For applications requiring only 100 mA collector current, the BF720T1G from onsemi offers 300 V breakdown voltage with 1.5 W power dissipation and 60 MHz transition frequency. This device is AEC-Q101 qualified and maintains active production status with 4,659 units in stock.

Automotive-Grade Alternative: BSP19,115

The BSP19,115 from Nexperia provides 100 mA collector current with elevated 350 V breakdown voltage, 70 MHz transition frequency, and AEC-Q101 automotive qualification. This option is suitable for automotive applications requiring enhanced voltage margin.

Frequently Asked Questions (FAQ)

Q: Can PZTA42T1G directly replace FZTA42TC in all applications?

A: PZTA42T1G provides direct electrical substitution for applications operating at or below 1.5 W power dissipation. The 500 mA collector current rating, 300 V breakdown voltage, and saturation characteristics are identical. Thermal design review is required only if the original design utilized the full 2 W rating of FZTA42TC.

Q: What is the difference between PZTA42T1G and SPZTA42T1G?

A: Both devices are manufactured by onsemi with identical electrical specifications: 500 mA collector current, 300 V breakdown voltage, 1.5 W power dissipation, and 50 MHz transition frequency. Selection between these parts depends on packaging format and supply chain availability. PZTA42T1G is available in Cut Tape and Digi-Reel format, while SPZTA42T1G is also available in Cut Tape and Digi-Reel format.

Q: Is CZTA42 TR PBFREE a true equivalent to FZTA42TC?

A: Yes. CZTA42 TR PBFREE from Central Semiconductor Corp matches all electrical and mechanical specifications of FZTA42TC: 500 mA collector current, 300 V breakdown voltage, 2 W power dissipation, 50 MHz transition frequency, and SOT-223 package compatibility. This part is the only available substitute maintaining the original 2 W power rating.

Q: Can BF720T1G be used as a substitute for FZTA42TC?

A: BF720T1G is suitable only for applications where collector current does not exceed 100 mA. The 300 V breakdown voltage and SOT-223 package are compatible, but the reduced current rating (100 mA vs. 500 mA) restricts its application scope. Vce saturation is also higher at 600 mV compared to 500 mV.

Q: What is the significance of the SOT-223 package designation?

A: All substitute parts utilize SOT-223 or SOT-223-3 package variants, which are mechanically and electrically compatible. The package designation (SOT-223, SOT-223-3, PG-SOT223-4) refers to minor variations in lead configuration and thermal characteristics. PCB footprints for TO-261-4 and TO-261AA accommodate all listed substitutes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. FZTA42TC also maintains RoHS3 compliance status.

Q: What is the operating temperature range for SPZTA42T1G?

A: Operating temperature range for SPZTA42T1G is not specified in the provided data. PZTA42T1G operates from -65°C to 150°C, providing reference for comparable onsemi devices.

Q: Is DZTA42-13 a suitable replacement for FZTA42TC?

A: DZTA42-13 from Diodes Incorporated provides electrical equivalence with 500 mA collector current and 300 V breakdown voltage. Power dissipation is reduced to 1 W (versus 2 W). This part is actively manufactured with 1,561 units in stock and is suitable for applications not requiring the full 2 W power rating.

Q: What certifications apply to automotive applications?

A: BF720,115, BF720T1G, BSP19,115, and PZTA42,115 carry AEC-Q101 automotive qualification. These parts are suitable for automotive-grade applications requiring formal qualification documentation.

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