FZT458TC Equivalent & Substitute Parts

Part Overview

The FZT458TC is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for high-voltage switching applications. This device operates at 400 V collector-emitter breakdown voltage with a maximum collector current of 300 mA and 2 W power dissipation in a surface mount SOT-223-3 package. The FZT458TC is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives with identical or compatible electrical characteristics are available from Diodes Incorporated and other manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	400	V
Current - Collector (Ic) (Max)	300	mA
Power - Max	2	W
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-223-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FZT458TC is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 400 V
Current - Collector (Ic) (Max): 300 mA or greater
Package / Case: SOT-223-3 or compatible TO-261-4, TO-261AA
Mounting Type: Surface Mount
Operating Temperature Range: Minimum -55°C to 150°C

Substitute Classification:

Parametric Equivalents maintain identical electrical specifications across all critical parameters. These parts are direct replacements with no circuit redesign required.

Manufacturer Recommended Substitutes are approved alternatives that meet or exceed the primary equivalence criteria but may have variations in secondary parameters such as transition frequency, power dissipation, or DC current gain. These substitutes are suitable for applications where the FZT458TC specifications are met or exceeded.

Parameter Comparison

Parameter	FZT458TC	FZT458QTA	FZT458TA	PBHV8140Z,115	PBHV8540Z,115	PZTA44,115	TSC966CW RPG
Manufacturer	Diodes Inc.	Diodes Inc.	Diodes Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Taiwan Semiconductor
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	400 V	400 V	400 V	400 V	400 V
Current - Collector (Ic) (Max)	300 mA	300 mA	300 mA	1 A	500 mA	300 mA	300 mA
Vce Saturation (Max) @ Ib, Ic	500mV @ 6mA, 50mA	500mV @ 6mA, 50mA	500mV @ 6mA, 50mA	250mV @ 200mA, 1A	250mV @ 60mA, 300mA	750mV @ 5mA, 50mA	500mV @ 5mA, 50mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA	1 µA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 50mA, 10V	100 @ 50mA, 10V	100 @ 50mA, 10V	35 @ 500mA, 10V	10 @ 300mA, 10V	50 @ 10mA, 10V	100 @ 1mA, 5V
Power - Max	2 W	2 W	2 W	1.45 W	1.4 W	1.35 W	—
Frequency - Transition	50 MHz	50 MHz	50 MHz	25 MHz	30 MHz	20 MHz	—
Operating Temperature (TJ)	-55 to 150°C	-55 to 150°C	-55 to 150°C	150°C	150°C	150°C	150°C
Package / Case	SOT-223-3	SOT-223-3	SOT-223-3	SOT-223	SOT-223	SOT-223	SOT-223
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	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)	3 (168 Hours)
Grade	—	Automotive	—	Automotive	Automotive	Automotive	—
Qualification	—	AEC-Q101	—	AEC-Q100	AEC-Q100	AEC-Q101	—

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Substitutes):

FZT458TA and FZT458QTA are parametric equivalents to the FZT458TC, maintaining identical electrical specifications across all critical parameters. FZT458TA is available in higher inventory (32,300 pcs) and is classified as active product status. FZT458QTA carries automotive-grade qualification (AEC-Q101) and is also active. Both parts are manufactured by Diodes Incorporated and are ROHS3 compliant with MSL 1 rating.

Manufacturer Recommended Substitutes:

PBHV8140Z,115 (Nexperia USA Inc.) exceeds the FZT458TC specification with 1 A maximum collector current versus 300 mA. This part is suitable for applications requiring higher current capacity while maintaining 400 V breakdown voltage. AEC-Q100 automotive qualification is provided.

PBHV8540Z,115 (Nexperia USA Inc.) provides 500 mA maximum collector current, positioned between the FZT458TC and PBHV8140Z,115. This part is suitable for moderate current increases and carries AEC-Q100 qualification.

PZTA44,115 (Nexperia USA Inc.) maintains 300 mA maximum collector current matching the FZT458TC. This part carries AEC-Q101 automotive qualification and is suitable for direct substitution in automotive applications.

TSC966CW RPG (Taiwan Semiconductor Corporation) maintains 300 mA maximum collector current and 400 V breakdown voltage. This part has MSL 3 rating (168 hours) versus MSL 1 for other substitutes, requiring controlled moisture exposure during storage and handling.

Product Status Consideration:

The FZT458TC is obsolete. All substitute parts listed are active products with ongoing manufacturing and supply availability. Selection should prioritize active parts to ensure long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can FZT458TA be used as a direct replacement for FZT458TC?

A: Yes. FZT458TA is a parametric equivalent with identical electrical specifications including 400 V breakdown voltage, 300 mA maximum collector current, 50 MHz transition frequency, and 2 W power dissipation. Both use SOT-223-3 surface mount packaging. FZT458TA is active product status with higher inventory availability.

Q: What is the difference between FZT458QTA and FZT458TA?

A: Both are parametric equivalents to FZT458TC with identical electrical specifications. FZT458QTA carries automotive-grade qualification (AEC-Q101) and is supplied in Tape & Reel packaging. FZT458TA is supplied in Cut Tape & Digi-Reel packaging. Selection depends on packaging requirements and automotive qualification necessity.

Q: Can PBHV8140Z,115 be used in place of FZT458TC?

A: PBHV8140Z,115 exceeds FZT458TC specifications with 1 A maximum collector current versus 300 mA. It maintains 400 V breakdown voltage and SOT-223 surface mount packaging. This substitute is suitable for applications where higher current capacity is acceptable or beneficial. Lower transition frequency (25 MHz versus 50 MHz) and lower power dissipation (1.45 W versus 2 W) must be evaluated for specific circuit requirements.

Q: What does MSL 3 rating on TSC966CW RPG mean?

A: MSL 3 indicates Moisture Sensitivity Level 3, requiring controlled moisture exposure for 168 hours maximum after package opening. This is more restrictive than MSL 1 (unlimited) on other substitutes. TSC966CW RPG requires proper storage in dry conditions and may require baking before reflow soldering if moisture absorption occurs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the FZT458TC compliance status.

Q: Which substitute part has the highest current rating?

A: PBHV8140Z,115 has the highest maximum collector current at 1 A, compared to 300 mA for FZT458TC and most other substitutes. PBHV8540Z,115 provides an intermediate option at 500 mA.

Q: Can I use a substitute with lower transition frequency than FZT458TC?

A: Substitutes with lower transition frequency (PBHV8140Z,115 at 25 MHz, PBHV8540Z,115 at 30 MHz, PZTA44,115 at 20 MHz) must be evaluated against circuit switching speed requirements. Applications requiring 50 MHz or higher switching performance should use FZT458TA or FZT458QTA, which maintain the original 50 MHz specification.

Q: Are automotive-qualified versions available?

A: Yes. FZT458QTA (AEC-Q101), PBHV8140Z,115 (AEC-Q100), PBHV8540Z,115 (AEC-Q100), and PZTA44,115 (AEC-Q101) carry automotive qualifications. Selection depends on specific automotive standard requirements.

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