FZT591ATC Equivalent & Substitute Parts

Part Overview

The FZT591ATC is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 40 V collector-emitter breakdown voltage and 1 A maximum collector current in a surface mount SOT-223-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The transistor operates across a temperature range of -55°C to 150°C and delivers 2 W maximum power dissipation with 150 MHz transition frequency.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	1	A
Collector-Emitter Breakdown Voltage (Max)	40	V
Vce Saturation @ Ib, Ic	500 mV @ 100 mA, 1 A	—
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE) Minimum @ Ic, Vce	300 @ 100 mA, 5 V	—
Power Dissipation Maximum	2	W
Transition Frequency	150	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package	SOT-223-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FZT591ATC is determined by strict adherence to the following 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 1 A
Vce saturation characteristics must support the specified operating point
DC current gain (hFE) must meet or exceed 300 at the specified test conditions
Transition frequency must be greater than or equal to 150 MHz
Operating temperature range must encompass -55°C to 150°C
Package must be SOT-223 or compatible pinout configuration
RoHS3 compliance required

Parametric Equivalent Parts (FZT591AQTA, FZT591ATA) maintain identical electrical specifications and package configuration, differing only in product status and packaging format (Tape & Reel).

Manufacturer Recommended Substitutes include parts with enhanced current ratings (2STN2540, FZT790A, NJT4030PT1G, NJT4030PT3G) or voltage ratings (BCP51 series) that exceed the FZT591ATC specifications while maintaining backward compatibility in circuit applications.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)	hFE (Min)	Fт (MHz)	Power (W)	Package	Status
FZT591ATC	Diodes Inc.	1 A	40 V	300	150	2	SOT-223-3	Obsolete
FZT591AQTA	Diodes Inc.	1 A	40 V	300	150	2	SOT-223-3	Active
FZT591ATA	Diodes Inc.	1 A	40 V	300	150	2	SOT-223-3	Active
2STN2540	STMicroelectronics	5 A	40 V	150	—	1.6	SOT-223	Active
BCP51,115	Nexperia USA Inc.	1 A	45 V	63	145	1	SOT-223	Active
BCP51-10,135	Nexperia USA Inc.	1 A	45 V	63	145	1	SOT-223	Active
BCP51-16,115	Nexperia USA Inc.	1 A	45 V	100	145	1	SOT-223	Active
BCP51-16,135	Nexperia USA Inc.	1 A	45 V	100	145	1	SOT-223	Active
FZT790A	onsemi	3 A	40 V	300	100	2	SOT-223-4	Active
NJT4030PT1G	onsemi	3 A	40 V	200	160	2	SOT-223	Active
NJT4030PT3G	onsemi	3 A	40 V	200	160	2	SOT-223	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents): FZT591AQTA and FZT591ATA are parametric equivalents to the FZT591ATC with identical electrical specifications and package configuration. Both parts are in active production status, providing immediate obsolescence mitigation. FZT591ATA offers the highest inventory availability (15,631 units) and is recommended as the primary replacement for existing FZT591ATC designs.

Enhanced Current Rating Substitutes: FZT790A (onsemi) and NJT4030PT1G/NJT4030PT3G (onsemi) provide 3 A maximum collector current while maintaining 40 V breakdown voltage and 2 W power dissipation. These parts are suitable for applications where current margin is required. NJT4030PT1G and NJT4030PT3G offer superior transition frequency (160 MHz) compared to the original specification.

Voltage-Enhanced Substitutes: BCP51 series parts (Nexperia USA Inc.) provide 45 V collector-emitter breakdown voltage, exceeding the FZT591ATC specification by 5 V. BCP51-16,115 and BCP51-16,135 offer DC current gain of 100 at the specified test condition. These parts carry automotive qualification (AEC-Q100) and are suitable for applications requiring enhanced voltage margin.

Current-Enhanced Substitute: 2STN2540 (STMicroelectronics) provides 5 A maximum collector current at 40 V breakdown voltage. This part is applicable where significantly higher current capacity is required, though power dissipation is reduced to 1.6 W.

All recommended substitutes maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can FZT591ATA be used as a direct replacement for FZT591ATC? A: Yes. FZT591ATA is a parametric equivalent with identical electrical specifications (1 A collector current, 40 V breakdown voltage, 300 hFE minimum, 150 MHz transition frequency) and SOT-223-3 package configuration. The part is in active production status with high inventory availability.

Q: What is the difference between FZT591AQTA and FZT591ATA? A: Both parts are parametric equivalents to FZT591ATC with identical electrical specifications. FZT591AQTA carries automotive qualification (AEC-Q101) and is supplied in Tape & Reel packaging. FZT591ATA is supplied in standard Tape & Reel format without automotive qualification. Selection depends on application requirements and packaging format.

Q: Can NJT4030PT1G or NJT4030PT3G replace FZT591ATC in existing designs? A: NJT4030PT1G and NJT4030PT3G are suitable substitutes for applications where higher collector current (3 A) is beneficial. Both parts maintain 40 V breakdown voltage, 2 W power dissipation, and superior transition frequency (160 MHz). The SOT-223 package is compatible with FZT591ATC pinout. DC current gain is 200 at the specified test condition, lower than the FZT591ATC specification of 300.

Q: Are BCP51 series parts compatible with FZT591ATC? A: BCP51 series parts (BCP51,115; BCP51-10,135; BCP51-16,115; BCP51-16,135) are compatible substitutes with 1 A collector current and 45 V breakdown voltage. These parts carry automotive qualification (AEC-Q100). DC current gain varies by part number (63 or 100 at specified test conditions), lower than FZT591ATC specification. Power dissipation is reduced to 1 W. Transition frequency is 145 MHz, slightly below the FZT591ATC specification.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Cut Tape (CT) & Digi-Reel® packaging is supplied on individual tape segments suitable for manual or semi-automated assembly. Tape & Reel (TR) packaging is supplied on continuous reels for automated pick-and-place equipment. Electrical specifications are identical; packaging format selection depends on assembly process requirements.

Q: Does 2STN2540 meet the FZT591ATC specifications? A: 2STN2540 provides 5 A maximum collector current and 40 V breakdown voltage, exceeding FZT591ATC current rating. However, power dissipation is reduced to 1.6 W (versus 2 W), and DC current gain is 150 at 2 A, 2 V test condition (versus 300 at 100 mA, 5 V). This part is suitable for applications requiring higher current capacity with compatible voltage and package specifications.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All recommended substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the FZT591ATC environmental specifications.

Q: What is the operating temperature range for substitute parts? A: FZT591AQTA, FZT591ATA, FZT790A, NJT4030PT1G, and NJT4030PT3G operate across -55°C to 150°C, matching the FZT591ATC specification. BCP51 series parts specify maximum junction temperature of 150°C without explicit minimum temperature rating in provided data. 2STN2540 specifies maximum junction temperature of 150°C without explicit minimum temperature rating.

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