NZT6728 Equivalent & Substitute Parts

Part Overview

The NZT6728 is a PNP bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 1.2 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 NZT6728 is suitable for general-purpose switching and amplification applications requiring moderate current handling in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	1.2	A
Power - Max	1	W
Vce Saturation (Max) @ Ib, Ic	500mV @ 10mA, 250mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 250mA, 1V	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-3 (SOT-223-3)	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the NZT6728 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (required)
Voltage - Collector Emitter Breakdown (Max): ≥ 60 V (minimum requirement)
Current - Collector (Ic) (Max): ≥ 1.2 A (minimum requirement)
Package / Case: SOT-223 or TO-261 variants (mechanical compatibility)
Mounting Type: Surface Mount (required)

Secondary Compatibility Factors:

Vce Saturation characteristics
DC Current Gain (hFE)
Operating Temperature Range
Moisture Sensitivity Level

Substitute parts are grouped into two categories:

Direct Equivalents (Higher Current Rating): Parts with 60 V breakdown voltage and current ratings ≥ 1.2 A, including PZT751T1G and SPZT751T1G (2 A rating).

Compatible Substitutes (Matched Voltage, Reduced Current): Parts with 60 V breakdown voltage and 1 A current rating, including BCP52,135 and BCP52-10,135, suitable for applications not requiring the full 1.2 A capability.

Limited Substitutes (Reduced Voltage Rating): Parts with 45 V breakdown voltage and 1 A current rating, including BCP51-16-TP and BCP5116TA, suitable only for applications with maximum operating voltages below 45 V.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Frequency - Transition	Operating Temp	Package	Product Status
NZT6728	onsemi	1.2 A	60 V	1 W	500mV @ 10mA, 250mA	50 @ 250mA, 1V	—	-55 to 150°C	SOT-223-3	Obsolete
PZT751T1G	onsemi	2 A	60 V	800 mW	500mV @ 200mA, 2A	75 @ 1A, 2V	75 MHz	-55 to 150°C	SOT-223	Active
SPZT751T1G	onsemi	2 A	60 V	800 mW	500mV @ 200mA, 2A	75 @ 1A, 2V	75 MHz	-55 to 150°C	SOT-223	Active
PZT2907AT1G	onsemi	600 mA	60 V	1.5 W	1.6V @ 50mA, 500mA	100 @ 150mA, 10V	200 MHz	-65 to 150°C	SOT-223	Active
PZT2907AT3G	onsemi	600 mA	60 V	1.5 W	1.6V @ 50mA, 500mA	100 @ 150mA, 10V	200 MHz	-65 to 150°C	SOT-223	Active
BCP51-16-TP	Micro Commercial Co	1 A	45 V	300 mW	500mV @ 50mA, 500mA	100 @ 150mA, 2V	100 MHz	-55 to 150°C	SOT-223	Active
BCP5116TA	Diodes Incorporated	1 A	45 V	2 W	500mV @ 50mA, 500mA	100 @ 150mA, 2V	150 MHz	-65 to 150°C	SOT-223-3	Active
BCP52,135	Nexperia USA Inc.	1 A	60 V	1 W	500mV @ 50mA, 500mA	63 @ 150mA, 2V	145 MHz	-55 to 150°C	SOT-223	Active
BCP52-10,135	Nexperia USA Inc.	1 A	60 V	1.3 W	500mV @ 50mA, 500mA	63 @ 150mA, 2V	145 MHz	-55 to 150°C	SOT-223	Active
BCP5216H6327XTSA1	Infineon Technologies	1 A	60 V	2 W	500mV @ 50mA, 500mA	100 @ 150mA, 2V	125 MHz	-55 to 150°C	SOT-223-4	Last Time Buy
BCP5216TA	Diodes Incorporated	1 A	60 V	2 W	500mV @ 50mA, 500mA	100 @ 150mA, 2V	150 MHz	-65 to 150°C	SOT-223-3	Active

Engineering Selection Recommendations

For Direct Replacement (Preferred):

PZT751T1G and SPZT751T1G are the primary substitutes for the NZT6728. Both parts are manufactured by onsemi, maintain the 60 V breakdown voltage specification, and exceed the 1.2 A current requirement with a 2 A rating. Both are in Active product status with RoHS3 compliance and REACH Unaffected designation. PZT751T1G is available in Tape & Reel packaging with 386,638 units in stock. SPZT751T1G is also available in Tape & Reel with 15,420 units in stock. These parts are electrically and mechanically compatible with the NZT6728 in SOT-223 package form factors.

For Matched Voltage, Reduced Current Applications:

BCP52,135 and BCP52-10,135 (Nexperia USA Inc.) maintain the 60 V breakdown voltage and provide 1 A current rating, matching the NZT6728 current specification. Both are in Active product status with RoHS3 compliance, AEC-Q100 automotive qualification, and REACH Unaffected designation. BCP52,135 is available with 12,300 units in stock. BCP52-10,135 is available with 5,660 units in stock. These parts are suitable for applications where the full 1.2 A capability is not required.

For Extended Temperature Range:

BCP5216TA (Diodes Incorporated) provides 60 V breakdown voltage, 1 A current rating, and extended operating temperature range (-65°C to 150°C). This part is in Active product status with RoHS3 compliance and 114,200 units in stock. The extended temperature range and higher power rating (2 W) make this part suitable for demanding thermal environments.

Not Recommended for Direct Substitution:

PZT2907AT1G and PZT2907AT3G have reduced current ratings (600 mA), which falls below the NZT6728 specification of 1.2 A. These parts are suitable only for applications with lower current requirements.

BCP51-16-TP and BCP5116TA have reduced voltage ratings (45 V), which falls below the NZT6728 specification of 60 V. These parts are suitable only for applications with maximum operating voltages below 45 V.

BCP5216H6327XTSA1 (Infineon Technologies) is in Last Time Buy status, indicating end-of-life conditions. This part should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can PZT751T1G directly replace NZT6728 in all applications?

A: PZT751T1G is electrically and mechanically compatible with NZT6728. Both are PNP transistors with 60 V breakdown voltage in SOT-223 package form factors. PZT751T1G has a higher current rating (2 A versus 1.2 A), which provides additional design margin. The primary difference is that PZT751T1G is in Active product status while NZT6728 is Obsolete, making PZT751T1G the preferred long-term solution.

Q: What is the difference between PZT751T1G and SPZT751T1G?

A: PZT751T1G and SPZT751T1G are electrically identical, both manufactured by onsemi with 60 V breakdown voltage and 2 A current rating. The primary difference is packaging: PZT751T1G is available in Tape & Reel with higher inventory (386,638 units), while SPZT751T1G is also available in Tape & Reel with lower inventory (15,420 units). Both are suitable substitutes for NZT6728.

Q: Why should I not use BCP51-16-TP as a substitute?

A: BCP51-16-TP has a 45 V breakdown voltage specification, which is 15 V lower than the NZT6728 specification of 60 V. This reduced voltage rating limits its use to applications with maximum operating voltages below 45 V. For applications requiring the full 60 V capability, BCP51-16-TP is not suitable.

Q: Can I use BCP5216TA instead of PZT751T1G?

A: BCP5216TA is a valid substitute for NZT6728 with 60 V breakdown voltage and 1 A current rating. However, BCP5216TA has a lower current rating (1 A) compared to PZT751T1G (2 A). BCP5216TA is suitable for applications where 1 A current is sufficient. BCP5216TA offers extended operating temperature range (-65°C to 150°C) and higher power rating (2 W), making it preferable for demanding thermal environments.

Q: What is the significance of RoHS3 compliance and REACH Unaffected status?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. REACH Unaffected status indicates the part is not subject to Registration, Evaluation, Authorization and Restriction of Chemicals regulations. Both designations are standard for modern electronic components and ensure regulatory compliance for commercial and industrial applications.

Q: Are there packaging differences between substitute parts?

A: Yes. NZT6728 uses SOT-223-3 package. PZT751T1G and SPZT751T1G use SOT-223 (TO-261) package. BCP5216TA uses SOT-223-3 package. BCP5216H6327XTSA1 uses PG-SOT223-4-10 package. All are surface mount packages with compatible pinouts for the three primary terminals (Base, Collector, Emitter). Verify PCB footprint compatibility before final selection.

Q: What does "Last Time Buy" status mean for BCP5216H6327XTSA1?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available for a limited time, but the part will not be manufactured after the Last Time Buy date. New designs should not use parts in Last Time Buy status. Select parts in Active product status for long-term production continuity.

Q: How do I determine which substitute is best for my application?

A: Selection depends on your specific requirements: (1) If you need the highest current capability and onsemi sourcing, select PZT751T1G or SPZT751T1G (2 A rating). (2) If you need 60 V with 1 A current and automotive qualification, select BCP52,135 or BCP52-10,135. (3) If you need extended temperature range (-65°C to 150°C), select BCP5216TA. (4) Verify all electrical parameters, package compatibility, and operating temperature requirements against your circuit design before final selection.

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