NZT751 Equivalent & Substitute Parts

Part Overview

The NZT751 is a PNP bipolar junction transistor manufactured by onsemi, rated for 60V collector-emitter breakdown voltage and 4A maximum collector current in a surface mount SOT-223-4 package. This device is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and ongoing system support.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	4	A
Vce Saturation (Max) @ Ib, Ic	500mV @ 200mA, 2A	—
Power - Max	1.2	W
Frequency - Transition	75	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223-4	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the NZT751 is determined by strict electrical and mechanical compatibility criteria. All substitute parts must satisfy the following conditions:

Primary Substitution Criteria:

Transistor type: PNP
Voltage - Collector Emitter Breakdown (Max): 60V or greater
Current - Collector (Ic) (Max): equal to or greater than 4A
Mounting type: Surface Mount
Package compatibility: TO-261-4, TO-261AA (SOT-223 variants)
RoHS3 compliance and MSL rating of 1 (Unlimited)

Secondary Compatibility Factors:

Vce saturation characteristics at specified bias conditions
DC current gain (hFE) performance
Frequency - Transition capability
Operating temperature range coverage

Substitute parts are classified into two categories:

Manufacturer Recommended Substitute: Parts designated as direct replacements by the original manufacturer or with active product status and equivalent electrical performance.

Similar Parts: Components meeting the primary electrical and mechanical criteria but with variations in secondary parameters such as current rating, power dissipation, or frequency response. These parts are suitable for applications where the NZT751 specifications can be met with alternative device characteristics.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce Breakdown [V]	Power [W]	Frequency [MHz]	Temp Range [°C]	Package	Product Status
NZT751	onsemi	4	60	1.2	75	-55 to 150	SOT-223-4	Obsolete
PZT751T1G	onsemi	2	60	0.8	75	-55 to 150	SOT-223	Active
BCP52TA	Diodes Incorporated	1	60	2	125	-65 to 150	SOT-223-3	Active
BSP31,115	NXP USA Inc.	1	60	1.3	100	-55 to 150	SOT-223	Active
DSS60600MZ4-13	Diodes Incorporated	6	60	1.2	100	-55 to 150	SOT-223-3	Active
FZT591TA	Diodes Incorporated	1	60	2	150	-55 to 150	SOT-223-3	Active
FZT751QTA	Diodes Incorporated	3	60	3	140	-55 to 150	SOT-223-3	Active
FZT751QTC	Diodes Incorporated	3	60	2	140	-55 to 150	SOT-223-3	Active
FZT751TA	Diodes Incorporated	3	60	2	140	-55 to 150	SOT-223-3	Active
FZT751TC	Diodes Incorporated	3	60	2	140	-55 to 150	SOT-223-3	Active
FZT792ATA	Diodes Incorporated	2	70	2	160	-55 to 150	SOT-223-3	Active

Engineering Selection Recommendations

Manufacturer Recommended Substitute:

PZT751T1G (onsemi) is the primary recommended substitute. This part is manufactured by the original NZT751 supplier and maintains active product status. It shares identical voltage and saturation characteristics at the specified bias point (500mV @ 200mA, 2A). The PZT751T1G operates within the same temperature range and meets RoHS3 compliance with MSL rating of 1. The primary difference is a reduced maximum collector current rating of 2A compared to the NZT751's 4A specification. This part is suitable for applications where the full 4A current capability is not required.

Active Substitute Parts with Full Current Capability:

DSS60600MZ4-13 (Diodes Incorporated) is the only active substitute meeting or exceeding the NZT751's 4A maximum collector current specification. This part is rated for 6A maximum collector current at 60V breakdown voltage. It maintains the same 1.2W power rating and operates across the full -55°C to 150°C temperature range. The DSS60600MZ4-13 exhibits improved DC current gain (120 @ 1A, 2V) and reduced saturation voltage (350mV @ 600mA, 6A), providing enhanced performance characteristics. RoHS3 compliance and MSL rating of 1 are confirmed.

Alternative Substitutes for Current-Limited Applications:

For applications where collector current requirements are 3A or less, the FZT751 series (FZT751QTA, FZT751QTC, FZT751TA, FZT751TC) from Diodes Incorporated provides active alternatives. These parts maintain 60V breakdown voltage and offer improved frequency response (140MHz) compared to the NZT751 (75MHz). All FZT751 variants are RoHS3 compliant with MSL rating of 1 and operate across -55°C to 150°C.

Compliance and Certification Status:

All recommended and alternative substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL rating of 1 (Unlimited moisture sensitivity). The FZT751QTC variant carries AEC-Q101 automotive qualification, suitable for automotive-grade applications.

Frequently Asked Questions (FAQ)

Q: Can PZT751T1G directly replace NZT751 in all applications?

A: PZT751T1G is suitable for applications where the maximum collector current requirement does not exceed 2A. The NZT751 is rated for 4A maximum collector current. If your circuit requires sustained operation above 2A, PZT751T1G is not appropriate. For applications operating at 2A or below, PZT751T1G provides direct electrical compatibility with identical voltage and saturation specifications.

Q: What is the difference between FZT751QTA, FZT751QTC, FZT751TA, and FZT751TC?

A: All four variants share identical electrical specifications: 3A maximum collector current, 60V breakdown voltage, 140MHz transition frequency, and -55°C to 150°C operating range. The primary differences are packaging format (Cut Tape vs. Tape & Reel) and automotive qualification. FZT751QTC carries AEC-Q101 automotive qualification; the others do not. Select based on packaging requirements and automotive compliance needs.

Q: Is DSS60600MZ4-13 a suitable replacement for high-current applications?

A: DSS60600MZ4-13 is rated for 6A maximum collector current, exceeding the NZT751's 4A specification. It maintains 60V breakdown voltage and 1.2W power rating. The improved DC current gain (120 @ 1A, 2V) and lower saturation voltage (350mV @ 600mA, 6A) provide enhanced performance. This part is suitable for applications requiring the full 4A capability or higher current operation.

Q: Are all substitute parts compatible with the SOT-223-4 package footprint?

A: All substitute parts use SOT-223 package variants (SOT-223-4 or SOT-223-3) with TO-261-4 or TO-261AA case designations. Physical footprint compatibility is confirmed across all listed substitutes. Verify specific pin configuration requirements for your PCB layout, as SOT-223-3 and SOT-223-4 variants may have different pin counts.

Q: What is the significance of the NZT751's obsolete status?

A: Obsolete status indicates the NZT751 is no longer manufactured by onsemi and is not available for new orders from the manufacturer. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Transition to an active substitute part is recommended for new designs and ongoing production requirements.

Q: Do all substitute parts meet RoHS3 compliance?

A: All substitute parts listed in this reference meet ROHS3 compliance and carry MSL rating of 1 (Unlimited). REACH status is unaffected for all parts. Compliance documentation is available from respective manufacturers upon request.

Q: Which substitute offers the best frequency performance?

A: FZT792ATA provides the highest transition frequency at 160MHz, compared to the NZT751's 75MHz. However, FZT792ATA is rated for 70V breakdown voltage and 2A maximum collector current. Select this part only if your application requires higher frequency response and operates within the 2A current limit.

Q: Can I use a substitute part with lower current rating if my circuit only draws 1A?

A: Yes. Parts such as BCP52TA, BSP31,115, and FZT591TA are rated for 1A maximum collector current and are suitable for applications operating at or below 1A. All maintain 60V breakdown voltage and RoHS3 compliance. Verify that the saturation voltage and DC current gain specifications meet your circuit requirements at the actual operating current.

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