FZT4403TA Equivalent & Substitute Parts

Part Overview

The FZT4403TA is a PNP bipolar junction transistor (BJT) manufactured by Diodes Incorporated, designed for switching applications in surface mount SOT-223 packaging. This component operates at a maximum collector current of 600 mA with a collector-emitter breakdown voltage of 40 V and a transition frequency of 200 MHz. The device is rated for 1.5 W maximum power dissipation and operates across a temperature range of -55°C to 150°C.

The FZT4403TA is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute components must maintain electrical compatibility within the specified parameter ranges while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	600	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	750mV @ 50mA, 500mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 2V	—
Power - Max	1.5	W
Frequency - Transition	200	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223-3	—

Substitute Part Grouping Explanation

Substitution of the FZT4403TA is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must be greater than or equal to 40 V
Maximum collector current must be greater than or equal to 600 mA
Package type must be SOT-223 or compatible surface mount variant
Operating temperature range must encompass the application requirements

Secondary Compatibility Factors:

DC current gain (hFE) minimum specifications
Vce saturation characteristics
Transition frequency performance
Power dissipation capability
RoHS and REACH compliance status

Substitute parts are grouped into two categories based on their electrical characteristics relative to the FZT4403TA:

Category A - Direct Electrical Equivalents (600 mA, 40 V): Parts that maintain the same collector current and breakdown voltage specifications as the original device.

Category B - Enhanced Performance Substitutes (Higher Current or Voltage): Parts that exceed the original specifications in collector current, breakdown voltage, or both, providing design margin and extended application flexibility.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(BR) V	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Power (Max) W	Freq (MHz)	Temp Range °C	Package	Status
FZT4403TA	Diodes Inc.	600	40	750mV @ 50mA, 500mA	100 @ 150mA, 2V	1.5	200	-55 to 150	SOT-223-3	Obsolete
PZT4403,115	Nexperia USA Inc.	600	40	750mV @ 50mA, 500mA	100 @ 150mA, 1V	1.15	200	-55 to 150	SOT-223	Active
2STN2540	STMicroelectronics	5000	40	450mV @ 500mA, 5A	150 @ 2A, 2V	1.6	—	-55 to 150	SOT-223	Active
BCP51,115	Nexperia USA Inc.	1000	45	500mV @ 50mA, 500mA	63 @ 150mA, 2V	1	145	-55 to 150	SOT-223	Active
BCP51-10,135	Nexperia USA Inc.	1000	45	500mV @ 50mA, 500mA	63 @ 150mA, 2V	1	145	-55 to 150	SOT-223	Active
BCP51-16,115	Nexperia USA Inc.	1000	45	500mV @ 50mA, 500mA	100 @ 150mA, 2V	1	145	-55 to 150	SOT-223	Active
BCP51-16,135	Nexperia USA Inc.	1000	45	500mV @ 50mA, 500mA	100 @ 150mA, 2V	1	145	-55 to 150	SOT-223	Active
CZT2907A TR PBFREE	Central Semiconductor Corp	600	60	1.6V @ 50mA, 500mA	100 @ 150mA, 10V	2	200	-65 to 150	SOT-223	Active
FZT790A	onsemi	3000	40	750mV @ 50mA, 2A	300 @ 10mA, 2V	2	100	-55 to 150	SOT-223-4	Active
NJT4030PT1G	onsemi	3000	40	500mV @ 300mA, 3A	200 @ 1A, 1V	2	160	-55 to 150	SOT-223	Active
NJT4030PT3G	onsemi	3000	40	500mV @ 300mA, 3A	200 @ 1A, 1V	2	160	-55 to 150	SOT-223	Active

Engineering Selection Recommendations

Direct Equivalent Selection:

PZT4403,115 from Nexperia USA Inc. is the primary direct equivalent for FZT4403TA replacement. This part maintains identical collector current (600 mA) and collector-emitter breakdown voltage (40 V) specifications. The PZT4403,115 is in active production status with ROHS3 compliance and AEC-Q101 automotive qualification, providing superior compliance posture compared to the obsolete FZT4403TA. Inventory availability is substantial at 8,522 pieces.

Enhanced Performance Substitutes:

For applications requiring higher current capacity or improved performance margins, the following active parts are suitable:

CZT2907A TR PBFREE maintains the 600 mA collector current specification while providing 60 V collector-emitter breakdown voltage (50% higher than the original). This part offers extended temperature range (-65°C to 150°C) and increased power dissipation (2 W). ROHS3 compliance and active production status support long-term availability.

FZT790A and NJT4030PT1G/PT3G provide 3 A collector current capability with 40 V breakdown voltage, suitable for applications requiring higher current handling. Both maintain SOT-223 packaging and -55°C to 150°C operating range. NJT4030 series offers superior transition frequency (160 MHz) compared to FZT790A (100 MHz).

2STN2540 from STMicroelectronics provides the highest current capacity at 5 A with 40 V breakdown voltage, appropriate for high-current switching applications requiring design margin.

BCP51 series (multiple variants) offers 1 A collector current with 45 V breakdown voltage and automotive qualification (AEC-Q100). These parts are suitable for moderate current applications with enhanced voltage margin.

Compliance Considerations:

All recommended active substitutes comply with ROHS3 standards and are REACH unaffected, addressing regulatory requirements absent in the obsolete FZT4403TA. Automotive-qualified variants (PZT4403,115 with AEC-Q101; BCP51 series with AEC-Q100) are available for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can PZT4403,115 directly replace FZT4403TA without circuit modification?

A: PZT4403,115 is electrically equivalent to FZT4403TA across all critical parameters: 600 mA collector current, 40 V breakdown voltage, 200 MHz transition frequency, and identical Vce saturation characteristics. Direct substitution is supported without circuit modification. Both parts use SOT-223 packaging with compatible pinouts.

Q: What is the difference between the various BCP51 part numbers?

A: BCP51,115; BCP51-10,135; BCP51-16,115; and BCP51-16,135 are variants of the same base product (BCP51) with differences in DC current gain specifications and packaging formats. BCP51-16 variants specify hFE minimum of 100 @ 150mA, 2V, while BCP51-10 and BCP51,115 specify hFE minimum of 63 @ 150mA, 2V. Packaging differences include Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® options. All variants maintain 1 A collector current and 45 V breakdown voltage.

Q: Why do some substitutes have higher collector current ratings than the FZT4403TA?

A: Enhanced performance substitutes (FZT790A, NJT4030 series, 2STN2540) provide higher collector current capacity to accommodate applications requiring design margin or future performance upgrades. These parts maintain the 40 V breakdown voltage specification while offering 3 A to 5 A current handling. Selection of higher-current parts is appropriate when circuit design permits and cost considerations are acceptable.

Q: Is CZT2907A suitable for direct replacement in all FZT4403TA applications?

A: CZT2907A maintains 600 mA collector current and 200 MHz transition frequency, matching the FZT4403TA specification. However, the 60 V collector-emitter breakdown voltage exceeds the original 40 V specification. This higher voltage rating is compatible with applications designed for 40 V operation and provides additional design margin. Vce saturation characteristics differ (1.6V @ 50mA, 500mA versus 750mV @ 50mA, 500mA), which may affect switching performance in saturation-mode applications.

Q: What packaging considerations apply to substitute selection?

A: The FZT4403TA uses SOT-223-3 packaging. Direct substitutes maintain SOT-223 or SOT-223-4 packaging with compatible TO-261-4 and TO-261AA case designations. All recommended substitutes are surface mount components suitable for automated assembly. Verify PCB footprint compatibility with specific part variant before procurement, as minor dimensional variations may exist between manufacturers.

Q: Are all recommended substitutes available in automotive-qualified versions?

A: PZT4403,115 carries AEC-Q101 qualification. BCP51 series variants (BCP51,115; BCP51-10,135; BCP51-16,115; BCP51-16,135) carry AEC-Q100 qualification. FZT790A, NJT4030PT1G, and NJT4030PT3G do not specify automotive qualification in the provided data. CZT2907A and 2STN2540 do not specify automotive qualification. Automotive applications requiring qualified components should prioritize PZT4403,115 or BCP51 series options.

Q: What is the significance of RoHS3 compliance for substitute selection?

A: All active substitute parts listed comply with ROHS3 standards, whereas the obsolete FZT4403TA is RoHS non-compliant. ROHS3 compliance is mandatory for products sold in European Union markets and increasingly required by global OEMs. Selection of ROHS3-compliant substitutes ensures regulatory compliance and supports long-term supply chain sustainability.

Q: How do transition frequency differences affect substitute selection?

A: The FZT4403TA specifies 200 MHz transition frequency. PZT4403,115 and CZT2907A maintain this specification. BCP51 series specifies 145 MHz, while FZT790A specifies 100 MHz. NJT4030 series specifies 160 MHz. For high-frequency switching applications, PZT4403,115 or CZT2907A are preferred. For moderate-frequency applications, BCP51 and NJT4030 series are acceptable. 2STN2540 does not specify transition frequency.

Q: What inventory considerations apply to substitute selection?

A: PZT4403,115 offers 8,522 pieces in stock. CZT2907A offers 1,386 pieces. NJT4030PT1G offers 35,100 pieces (highest availability). BCP51 variants offer 4,400 to 52,964 pieces depending on specific part number. FZT790A offers 7,960 pieces. 2STN2540 offers 12,600 pieces. Inventory levels support production requirements across all recommended substitutes.

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