FZTA42TA Equivalent & Substitute Parts

Part Overview

The FZTA42TA is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-223-3 package. This device operates at 300 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 2 W power dissipation capability. The FZTA42TA is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while accommodating packaging variations.

Key Parameters

Parameter	FZTA42TA Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	2	W
Vce Saturation (Max) @ Ib, Ic	500mV @ 2mA, 20mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 30mA, 10V	—
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the FZTA42TA are classified into two categories based on electrical and mechanical compatibility:

Direct Electrical Equivalents maintain all critical electrical parameters: 300 V collector-emitter breakdown voltage, 500 mA maximum collector current, 50 MHz transition frequency, and identical saturation voltage characteristics. These parts are suitable for direct replacement in existing designs without circuit modification. This category includes DZTA42-13, PZTA42H6327XTSA1, PZTA42T1G, SPZTA42T1G, and CZTA42 TR PBFREE.

Parametric Equivalents with Current Derating include BF720,115, BF720T1G, BSP19,115, and PZTA42,115. These devices maintain the 300 V voltage rating and SOT-223 package compatibility but feature reduced maximum collector current (100 mA versus 500 mA) and lower power dissipation (1.2 to 1.5 W versus 2 W). These parts are suitable for applications where collector current requirements do not exceed 100 mA.

Key Parameters Determining Substitution:

Voltage - Collector Emitter Breakdown (Max): 300 V minimum
Current - Collector (Ic) (Max): 500 mA for direct equivalents; 100 mA for parametric equivalents
Package / Case: TO-261-4, TO-261AA (SOT-223 variants)
Mounting Type: Surface Mount
Vce Saturation characteristics: 500mV @ 2mA, 20mA
DC Current Gain (hFE): 40 minimum @ 30mA, 10V

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power W	fT MHz	Temp Range °C	Package	Status
FZTA42TA	Diodes Inc.	500	300	2	50	-55 to 150	SOT-223-3	Obsolete
DZTA42-13	Diodes Inc.	500	300	1	50	-65 to 150	SOT-223-3	Active
PZTA42H6327XTSA1	Infineon	500	300	1.5	70	150	PG-SOT223-4	Last Time Buy
PZTA42T1G	onsemi	500	300	1.5	50	150	SOT-223	Active
SPZTA42T1G	onsemi	500	300	1.5	50	Not Specified	SOT-223	Active
BF720,115	Nexperia	100	300	1.2	60	150	SOT-223	Active
BF720T1G	onsemi	100	300	1.5	60	-65 to 150	SOT-223	Active
BSP19,115	Nexperia	100	350	1.2	70	150	SOT-223	Active
PZTA42,115	Nexperia	100	300	1.2	50	150	SOT-223	Active
CZTA42 TR PBFREE	Central Semiconductor	500	300	2	50	-65 to 150	SOT-223	Active

Engineering Selection Recommendations

For Direct Replacement (500 mA Applications):

PZTA42T1G is the primary recommended substitute. This onsemi device maintains full electrical equivalence with the FZTA42TA across all critical parameters: 500 mA collector current, 300 V breakdown voltage, 50 MHz transition frequency, and identical saturation characteristics. The part is in active production status with extensive inventory availability (113,300 units), ensuring supply continuity. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) match the original specification.

CZTA42 TR PBFREE from Central Semiconductor provides an alternative direct equivalent with identical electrical specifications and 2 W power rating. This part is actively produced with 3,359 units in stock and offers extended operating temperature range (-65°C to 150°C).

DZTA42-13 from Diodes Incorporated is an active alternative from the original manufacturer. While power dissipation is reduced to 1 W, all other electrical parameters remain equivalent. This part is suitable for applications where thermal margin is not critical.

For Current-Limited Applications (100 mA Maximum):

BF720T1G from onsemi is recommended for designs requiring reduced collector current. This device maintains 300 V voltage rating and SOT-223 package compatibility while operating at 100 mA maximum. The extended temperature range (-65°C to 150°C) and 1.5 W power rating provide operational flexibility.

PZTA42,115 from Nexperia offers equivalent performance at 100 mA with automotive-grade qualification (AEC-Q101) and 1.2 W power dissipation.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating. REACH status varies: PZTA42T1G, SPZTA42T1G, and CZTA42 TR PBFREE are REACH Unaffected, while the original FZTA42TA is REACH Affected. For applications requiring REACH compliance, selection of REACH Unaffected alternatives is necessary.

Frequently Asked Questions (FAQ)

Q: Can PZTA42T1G directly replace FZTA42TA in all applications?

A: PZTA42T1G maintains electrical equivalence across all critical parameters: 500 mA collector current, 300 V breakdown voltage, 50 MHz transition frequency, and identical saturation voltage. The part operates within the same temperature range (150°C maximum junction temperature). Direct substitution is valid for applications designed to the FZTA42TA specification.

Q: What is the difference between direct equivalents and parametric equivalents?

A: Direct equivalents (PZTA42T1G, DZTA42-13, CZTA42 TR PBFREE) maintain 500 mA collector current and 2 W power dissipation, suitable for high-current applications. Parametric equivalents (BF720T1G, PZTA42,115) operate at 100 mA maximum collector current and 1.2 to 1.5 W power dissipation. Selection depends on circuit current requirements.

Q: Are SOT-223-3 and SOT-223 packages interchangeable?

A: SOT-223-3 and SOT-223 (TO-261) packages are mechanically compatible with identical pin configurations and footprints. Both are surface mount packages with three leads. Substitution between these package variants does not require PCB redesign.

Q: Why does DZTA42-13 have lower power rating (1 W) than FZTA42TA (2 W)?

A: Power rating reduction reflects thermal design differences between the devices. DZTA42-13 maintains full electrical equivalence at 500 mA and 300 V. Applications requiring maximum power dissipation should select alternatives with 1.5 to 2 W ratings (PZTA42T1G, CZTA42 TR PBFREE).

Q: What is the significance of REACH Affected versus REACH Unaffected status?

A: REACH Affected status indicates the original FZTA42TA contains substances of concern under REACH regulations. REACH Unaffected alternatives (PZTA42T1G, CZTA42 TR PBFREE) do not contain these substances and are suitable for applications requiring REACH compliance.

Q: Can BF720T1G be used in applications designed for 500 mA operation?

A: BF720T1G is rated for 100 mA maximum collector current and is not suitable for applications requiring 500 mA operation. This device is appropriate only for circuits designed to operate at or below 100 mA collector current.

Q: What is the operating temperature difference between FZTA42TA and PZTA42T1G?

A: FZTA42TA specifies -55°C to 150°C operating range, while PZTA42T1G specifies 150°C maximum junction temperature without lower limit specification. For applications requiring operation below 0°C, verification of PZTA42T1G low-temperature performance is necessary based on specific circuit requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed maintain ROHS3 compliance status, matching the original FZTA42TA specification. This compliance applies to all recommended direct equivalents and parametric equivalents.

Q: What inventory considerations apply to substitute selection?

A: PZTA42T1G offers the highest inventory availability (113,300 units), ensuring supply continuity for production requirements. CZTA42 TR PBFREE (3,359 units) and DZTA42-13 (1,561 units) provide alternative sources. Current-limited alternatives (BF720T1G, PZTA42,115) maintain adequate stock levels (4,659 and 3,020 units respectively).

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