FZT757TC Equivalent & Substitute Parts

Part Overview

The FZT757TC is a PNP 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 FZT757TC is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal operating range while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	2	W
Frequency - Transition	30	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

Substitution of the FZT757TC is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP configuration required
Voltage - Collector Emitter Breakdown (Max): 300 V minimum
Current - Collector (Ic) (Max): 500 mA minimum
Power - Max: 2 W minimum
Mounting Type: Surface Mount
Package / Case: TO-261-4 or TO-261AA compatible
Supplier Device Package: SOT-223 or SOT-223-3 compatible

Secondary Compatibility Factors:

Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance required
MSL Level 1 (Unlimited) preferred

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Direct Parametric Equivalents: Parts matching all primary criteria with identical or superior electrical specifications.

Category B - Functional Substitutes: Parts meeting primary criteria with minor deviations in secondary parameters such as transition frequency or power dissipation, suitable for applications with relaxed performance requirements.

Parameter Comparison

Parameter	FZT757TC (Main)	FZT757TA	BSP16T1G	CZTA92 TR PBFREE	PZTA92T1G	SMMJT350T1G
Manufacturer	Diodes Inc.	Diodes Inc.	onsemi	Central Semiconductor	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	300 V	300 V	300 V	300 V	300 V	300 V
Current - Collector (Ic) (Max)	500 mA	500 mA	100 mA	500 mA	500 mA	500 mA
Power - Max	2 W	2 W	1.5 W	2 W	1.5 W	650 mW
Frequency - Transition	30 MHz	30 MHz	15 MHz	50 MHz	50 MHz	—
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-65 to 150°C	-65 to 150°C	150°C (Max)	-55 to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-3	SOT-223-3	SOT-223 (TO-261)	SOT-223	SOT-223 (TO-261)	SOT-223 (TO-261)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

FZT757TA (Diodes Incorporated)

FZT757TA is the primary direct substitute for FZT757TC. This part maintains identical electrical specifications across all critical parameters: 300 V breakdown voltage, 500 mA collector current, 2 W power dissipation, and 30 MHz transition frequency. FZT757TA is classified as Active product status, ensuring long-term availability and supply chain continuity. The part is ROHS3 compliant with MSL Level 1 rating. FZT757TA is supplied in Cut Tape (CT) packaging with 24,735 units in stock. REACH status is Unaffected, eliminating regulatory compliance concerns associated with the obsolete FZT757TC.

CZTA92 TR PBFREE (Central Semiconductor Corp)

CZTA92 TR PBFREE meets all primary substitution criteria with 300 V breakdown voltage and 500 mA collector current. This part offers enhanced transition frequency at 50 MHz compared to the FZT757TC baseline of 30 MHz. Power dissipation is rated at 2 W, matching the original specification. Operating temperature range extends to -65°C minimum, providing improved low-temperature performance. CZTA92 TR PBFREE is Active product status with ROHS3 compliance and REACH Unaffected status. Inventory availability is 676 units in Tape & Reel packaging.

PZTA92T1G (onsemi)

PZTA92T1G provides functional substitution with 300 V breakdown voltage and 500 mA collector current. Transition frequency is rated at 50 MHz, exceeding the FZT757TC specification. Power dissipation is specified at 1.5 W, which is lower than the original 2 W rating. This part is suitable for applications where power dissipation requirements do not exceed 1.5 W. PZTA92T1G is Active product status with ROHS3 compliance and REACH Unaffected status. Inventory availability is 77,100 units in Tape & Reel packaging, providing excellent supply security.

BSP16T1G (onsemi)

BSP16T1G is a functional substitute with reduced current capacity. Maximum collector current is specified at 100 mA, which is below the FZT757TC rating of 500 mA. This part is suitable only for applications requiring collector currents not exceeding 100 mA. Power dissipation is rated at 1.5 W. Transition frequency is 15 MHz, lower than the FZT757TC baseline. BSP16T1G is Active product status with ROHS3 compliance and REACH Unaffected status. Operating temperature range extends to -65°C minimum. Inventory availability is 18,392 units in Tape & Reel packaging.

SMMJT350T1G (onsemi)

SMMJT350T1G provides functional substitution with 300 V breakdown voltage and 500 mA collector current. Power dissipation is specified at 650 mW, which is significantly lower than the FZT757TC rating of 2 W. This part is suitable only for applications with power dissipation requirements not exceeding 650 mW. Transition frequency specification is not provided. SMMJT350T1G is Active product status with ROHS3 compliance and REACH Unaffected status. Operating temperature range matches the FZT757TC specification at -55°C to 150°C. Inventory availability is 3,400 units in Tape & Reel packaging.

Frequently Asked Questions (FAQ)

Q: Can FZT757TA be used as a direct replacement for FZT757TC?

A: Yes. FZT757TA is a direct parametric equivalent with identical electrical specifications across all critical parameters: 300 V breakdown voltage, 500 mA collector current, 2 W power dissipation, 30 MHz transition frequency, and -55°C to 150°C operating temperature range. Both parts use the same SOT-223-3 package and TO-261-4/TO-261AA case outline. FZT757TA is Active product status, providing superior supply chain continuity compared to the obsolete FZT757TC.

Q: What is the primary difference between CZTA92 TR PBFREE and FZT757TC?

A: CZTA92 TR PBFREE maintains the same 300 V breakdown voltage, 500 mA collector current, and 2 W power dissipation as FZT757TC. The primary difference is transition frequency: CZTA92 TR PBFREE is rated at 50 MHz compared to FZT757TC at 30 MHz. Operating temperature range extends to -65°C minimum on CZTA92 TR PBFREE. Both parts are compatible with the same PCB footprint and package outline.

Q: Can PZTA92T1G replace FZT757TC in all applications?

A: PZTA92T1G is suitable for applications where power dissipation does not exceed 1.5 W. The FZT757TC is rated at 2 W maximum power dissipation. If your application requires full 2 W power handling capability, PZTA92T1G is not appropriate. PZTA92T1G maintains 300 V breakdown voltage and 500 mA collector current, matching the FZT757TC current and voltage specifications.

Q: Why is BSP16T1G listed as a substitute if it has lower current rating?

A: BSP16T1G is listed as a functional substitute for applications with reduced current requirements. Maximum collector current is 100 mA, which is below the FZT757TC rating of 500 mA. BSP16T1G maintains the 300 V breakdown voltage and is suitable only for circuits designed to operate at 100 mA or lower collector current levels. Applications requiring full 500 mA capability must use FZT757TA, CZTA92 TR PBFREE, PZTA92T1G, or SMMJT350T1G.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in surface mount packages compatible with the FZT757TC footprint. FZT757TA is available in Cut Tape (CT) packaging. CZTA92 TR PBFREE, PZTA92T1G, BSP16T1G, and SMMJT350T1G are available in Tape & Reel (TR) packaging. All parts use SOT-223 or SOT-223-3 supplier device packages with TO-261-4 or TO-261AA case outlines, ensuring PCB compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. FZT757TA, CZTA92 TR PBFREE, PZTA92T1G, BSP16T1G, and SMMJT350T1G all carry ROHS3 compliance certification. All parts have MSL Level 1 (Unlimited) moisture sensitivity rating, indicating no special moisture handling requirements during storage or assembly.

Q: What is the REACH compliance status of substitute parts?

A: All substitute parts are REACH Unaffected. FZT757TC is classified as REACH Affected, which may present regulatory compliance concerns for new designs. Substituting with REACH Unaffected parts (FZT757TA, CZTA92 TR PBFREE, PZTA92T1G, BSP16T1G, or SMMJT350T1G) eliminates REACH-related compliance requirements.

Q: Which substitute part offers the best supply availability?

A: PZTA92T1G offers the highest inventory availability with 77,100 units in stock. FZT757TA provides 24,735 units, BSP16T1G provides 18,392 units, SMMJT350T1G provides 3,400 units, and CZTA92 TR PBFREE provides 676 units. For applications requiring immediate availability and long-term supply security, PZTA92T1G is the optimal choice, provided power dissipation requirements do not exceed 1.5 W.

Q: Can SMMJT350T1G be used in high-power applications?

A: No. SMMJT350T1G is rated at 650 mW maximum power dissipation, which is significantly lower than FZT757TC at 2 W. This part is suitable only for low-power applications where power dissipation does not exceed 650 mW. Applications requiring 2 W power handling capability must use FZT757TA, CZTA92 TR PBFREE, or PZTA92T1G.

Q: What is the operating temperature range for each substitute part?

A: FZT757TA and SMMJT350T1G operate from -55°C to 150°C, matching FZT757TC. CZTA92 TR PBFREE and BSP16T1G extend the minimum operating temperature to -65°C. PZTA92T1G specifies only a maximum operating temperature of 150°C without a stated minimum. For applications requiring full -55°C to 150°C range, FZT757TA or SMMJT350T1G are recommended.

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