NZT6715 Equivalent & Substitute Parts

Part Overview

The NZT6715 is an NPN bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a surface mount SOT-223-4 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while offering active product status and continued availability.

Key Parameters

Parameter	NZT6715 Specification
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	40 V
Current - Collector (Ic) (Max)	1.5 A
Power - Max	1 W
Vce Saturation (Max) @ Ib, Ic	500mV @ 100mA, 1A
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 1A, 1V
Current - Collector Cutoff (Max)	100µA (ICBO)
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-4
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the NZT6715 are selected based on the following critical parameters that determine functional compatibility:

Voltage Rating Compatibility: Substitute parts must have a collector-emitter breakdown voltage (VCEO) equal to or greater than 40 V to ensure safe operation in circuits designed for the NZT6715.

Current Rating Compatibility: Substitute parts must have a maximum collector current (Ic) equal to or greater than 1.5 A to support the same load conditions.

Package Compatibility: All substitute parts must use the SOT-223 surface mount package family (TO-261-4 or TO-261AA) to ensure mechanical and electrical compatibility with existing PCB layouts.

Transistor Type: All substitute parts must be NPN type to maintain circuit polarity and biasing requirements.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to meet regulatory and environmental standards.

The three identified substitute parts are categorized as follows:

NSS40301MZ4T1G: Maintains the 40 V voltage rating while exceeding current capacity (3 A vs. 1.5 A) and power dissipation (2 W vs. 1 W). Active product status with enhanced performance specifications.

PZT651T1G: Exceeds voltage rating (60 V vs. 40 V) and current capacity (2 A vs. 1.5 A). Active product status with reduced power dissipation (800 mW vs. 1 W).

FZT491TA: Exceeds voltage rating (60 V vs. 40 V) while maintaining current capacity (1 A vs. 1.5 A). Active product status from alternative manufacturer (Diodes Incorporated) with enhanced power dissipation (2 W vs. 1 W).

Parameter Comparison

Parameter	NZT6715	NSS40301MZ4T1G	PZT651T1G	FZT491TA
Manufacturer	onsemi	onsemi	onsemi	Diodes Incorporated
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	60 V	60 V
Current - Collector (Ic) (Max)	1.5 A	3 A	2 A	1 A
Power - Max	1 W	2 W	800 mW	2 W
Vce Saturation (Max) @ Ib, Ic	500mV @ 100mA, 1A	200mV @ 300mA, 3A	500mV @ 200mA, 2A	500mV @ 100mA, 1A
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 1A, 1V	200 @ 1A, 1V	75 @ 1A, 2V	100 @ 500mA, 5V
Current - Collector Cutoff (Max)	100µA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	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
Supplier Device Package	SOT-223-4	SOT-223 (TO-261)	SOT-223 (TO-261)	SOT-223-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

NSS40301MZ4T1G is the primary substitute for direct replacement in applications requiring the 40 V voltage rating. This part maintains identical voltage specifications while providing enhanced current capacity (3 A) and power dissipation (2 W). Active product status ensures long-term availability and supply chain continuity. The onsemi manufacturer relationship provides design continuity. This part is suitable for designs where the original 1.5 A specification represents a conservative design margin.

PZT651T1G serves as a substitute for applications where voltage headroom is beneficial. The 60 V rating provides additional safety margin in circuits subject to transient overvoltage conditions. Active product status and onsemi manufacturer origin support procurement reliability. The 2 A current capacity exceeds NZT6715 specifications. This part is suitable for designs where voltage margin enhancement is acceptable.

FZT491TA provides substitution capability through an alternative manufacturer (Diodes Incorporated) while maintaining active product status. The 60 V voltage rating and 2 W power dissipation exceed NZT6715 specifications. The 1 A current rating is lower than the original 1.5 A specification and requires circuit analysis to confirm adequacy for the intended application. This part is suitable for applications where current requirements do not exceed 1 A and alternative sourcing is required.

All three substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original NZT6715 specification.

Frequently Asked Questions (FAQ)

Q: Can NSS40301MZ4T1G be used as a direct replacement for NZT6715?

A: NSS40301MZ4T1G maintains the 40 V collector-emitter breakdown voltage and exceeds the 1.5 A current specification with 3 A maximum rating. The SOT-223 package is mechanically compatible with NZT6715 PCB layouts. This part is suitable for direct replacement in applications where the original current specification represents a design margin.

Q: What is the primary difference between PZT651T1G and NZT6715?

A: PZT651T1G has a higher collector-emitter breakdown voltage (60 V vs. 40 V) and higher maximum collector current (2 A vs. 1.5 A). Both parts use the SOT-223 package and maintain identical compliance certifications. The higher voltage rating provides additional transient protection margin.

Q: Why does FZT491TA have a lower current rating than NZT6715?

A: FZT491TA is rated for 1 A maximum collector current compared to NZT6715's 1.5 A specification. This part is from an alternative manufacturer (Diodes Incorporated) and provides a 60 V voltage rating. Circuit analysis is required to confirm that 1 A current capacity is adequate for the intended application.

Q: Are all substitute parts compatible with existing NZT6715 PCB layouts?

A: All substitute parts use the SOT-223 surface mount package family (TO-261-4 or TO-261AA) and are mechanically compatible with NZT6715 PCB layouts. Pin configurations are identical across all parts, enabling direct PCB placement without layout modifications.

Q: Do all substitute parts meet the same compliance requirements as NZT6715?

A: All three substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating. Regulatory and environmental compliance is equivalent across all parts.

Q: Which substitute part provides the best performance upgrade?

A: NSS40301MZ4T1G provides the most comprehensive performance upgrade, maintaining the 40 V voltage rating while doubling the current capacity (3 A vs. 1.5 A) and power dissipation (2 W vs. 1 W). This part is from onsemi, the original manufacturer, ensuring design continuity.

Q: Can FZT491TA be used in high-current applications?

A: FZT491TA is rated for 1 A maximum collector current, which is lower than NZT6715's 1.5 A specification. This part is suitable only for applications where collector current does not exceed 1 A. Circuit analysis is required to confirm adequacy for the intended application.

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

A: NSS40301MZ4T1G and FZT491TA both support -55°C to 150°C operating temperature range, matching NZT6715 specifications. PZT651T1G specifies 150°C maximum junction temperature without a minimum temperature specification in the provided data.

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