FZT558 Equivalent & Substitute Parts

Part Overview

The FZT558 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 400 V collector-emitter breakdown voltage with a maximum collector current of 200 mA and 2 W power dissipation capability. The FZT558 is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current availability and compliance standards.

Key Parameters

Parameter	FZT558
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	400 V
Current - Collector (Ic) (Max)	200 mA
Power - Max	2 W
Frequency - Transition	50 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 50mA, 10V
Vce Saturation (Max) @ Ib, Ic	500mV @ 6mA, 50mA
Current - Collector Cutoff (Max)	100nA
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	SOT-223-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the FZT558 are categorized based on electrical parameter compatibility and product availability status. The substitution logic follows these criteria:

Primary Equivalent (Direct Replacement): Parts maintaining identical electrical specifications, voltage ratings, current ratings, and package configuration enable direct substitution without circuit modification.

Parametric Equivalent (Functional Replacement): Parts with equal or superior electrical performance in critical parameters (voltage rating, current capacity, power dissipation, frequency response) within the same package family allow functional substitution. These parts must not degrade circuit performance.

Key Parameters for Substitution Assessment:

Transistor Type: PNP (mandatory match)
Voltage - Collector Emitter Breakdown: Equal or greater than 400 V
Current - Collector (Max): Equal to or greater than 200 mA
Power - Max: Equal to or greater than 2 W
Package / Case: SOT-223 family (SOT-223-3, SOT-223)
Mounting Type: Surface Mount (mandatory match)
Operating Temperature Range: Must encompass or exceed -55°C ~ 150°C

Parameter Comparison

Parameter	FZT558	FZT558TA	PBHV9540Z,115	PZT2907AT1G	PZT2907AT3G
Manufacturer	Diodes Incorporated	Diodes Incorporated	Nexperia USA Inc.	onsemi	onsemi
Transistor Type	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	400 V	60 V	60 V
Current - Collector (Ic) (Max)	200 mA	200 mA	500 mA	600 mA	600 mA
Power - Max	2 W	2 W	1.45 W	1.5 W	1.5 W
Frequency - Transition	50 MHz	50 MHz	30 MHz	200 MHz	200 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 50mA, 10V	100 @ 50mA, 10V	80 @ 300mA, 10V	100 @ 150mA, 10V	100 @ 150mA, 10V
Vce Saturation (Max) @ Ib, Ic	500mV @ 6mA, 50mA	500mV @ 6mA, 50mA	320mV @ 100mA, 500mA	1.6V @ 50mA, 500mA	1.6V @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA	100nA	100nA	10nA	10nA
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOT-223-3	SOT-223-3	SOT-223	SOT-223 (TO-261)	SOT-223 (TO-261)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

FZT558TA (Diodes Incorporated)

The FZT558TA is the direct parametric equivalent of the FZT558, maintaining identical electrical specifications across all critical parameters including 400 V breakdown voltage, 200 mA maximum collector current, 2 W power dissipation, and 50 MHz transition frequency. This part is manufactured by the same supplier and carries active product status with superior inventory availability (46,110 units). The FZT558TA is supplied in Tape & Reel packaging and meets ROHS3 compliance. This part is the primary selection for direct replacement applications.

PBHV9540Z,115 (Nexperia USA Inc.)

The PBHV9540Z,115 maintains the 400 V voltage rating required for the FZT558 application while providing enhanced current capacity (500 mA versus 200 mA). This part is qualified to AEC-Q100 automotive standards and carries active product status. The transition frequency is reduced to 30 MHz and power dissipation is 1.45 W. This part is suitable for applications where higher current capacity is beneficial and automotive-grade qualification is required. The lower power rating necessitates circuit evaluation for thermal performance.

PZT2907AT1G and PZT2907AT3G (onsemi)

The PZT2907AT1G and PZT2907AT3G are functionally equivalent parts with superior electrical performance in current capacity (600 mA), transition frequency (200 MHz), and operating temperature range (-65°C to 150°C). However, these parts operate at 60 V maximum breakdown voltage, which is significantly lower than the FZT558's 400 V rating. These parts are suitable only for applications where the circuit voltage does not exceed 60 V. Both variants are active products with high inventory availability. PZT2907AT1G is supplied in Cut Tape & Digi-Reel packaging, while PZT2907AT3G is supplied in Tape & Reel packaging.

Frequently Asked Questions (FAQ)

Q: Can the FZT558TA be used as a direct replacement for the FZT558?

A: Yes. The FZT558TA maintains identical electrical specifications, package configuration, and operating parameters. No circuit modifications are required. The FZT558TA is the recommended replacement due to its active product status and equivalent performance.

Q: What is the primary difference between FZT558TA and PBHV9540Z,115?

A: Both parts maintain the 400 V voltage rating. The PBHV9540Z,115 provides higher maximum collector current (500 mA versus 200 mA) and includes AEC-Q100 automotive qualification. The PBHV9540Z,115 has lower transition frequency (30 MHz versus 50 MHz) and reduced maximum power dissipation (1.45 W versus 2 W). Selection depends on circuit current requirements and automotive qualification needs.

Q: Why are PZT2907AT1G and PZT2907AT3G not suitable for all FZT558 applications?

A: The PZT2907AT1G and PZT2907AT3G operate at maximum 60 V breakdown voltage, compared to the FZT558's 400 V rating. These parts are suitable only for low-voltage applications not exceeding 60 V. Circuits designed for 400 V operation cannot use these parts without significant redesign.

Q: What is the difference between PZT2907AT1G and PZT2907AT3G?

A: Both parts are electrically identical. The difference is packaging: PZT2907AT1G is supplied in Cut Tape & Digi-Reel format, while PZT2907AT3G is supplied in Tape & Reel format. Selection depends on assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (FZT558TA, PBHV9540Z,115, PZT2907AT1G, and PZT2907AT3G) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: Which substitute part has the highest inventory availability?

A: PZT2907AT1G has the highest inventory availability at 125,200 units. FZT558TA has 46,110 units, PBHV9540Z,115 has 12,815 units, and PZT2907AT3G has 24,130 units.

Q: Can PBHV9540Z,115 be used in applications requiring 2 W power dissipation?

A: PBHV9540Z,115 has a maximum power rating of 1.45 W, which is lower than the FZT558's 2 W rating. Circuit thermal analysis is required to determine if this reduced power rating is acceptable for the specific application.

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