DZT651-13 Equivalent & Substitute Parts

Part Overview

The DZT651-13 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, rated for 60V collector-emitter breakdown voltage and 3A 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 part operates across a temperature range of -55°C to 150°C and delivers 1W maximum power dissipation with a transition frequency of 200MHz.

Key Parameters

Parameter	Value
Transistor Type	NPN
Collector-Emitter Breakdown Voltage (Max)	60V
Collector Current (Max)	3A
Power Dissipation (Max)	1W
Transition Frequency	200MHz
Operating Temperature Range	-55°C to 150°C
Package Type	SOT-223-3
Mounting Type	Surface Mount
DC Current Gain (hFE Min)	100 @ 500mA, 2V
Vce Saturation (Max)	600mV @ 300mA, 3A

Substitute Part Grouping Explanation

Substitution of the DZT651-13 is determined by the following critical parameters: transistor type (NPN), collector-emitter breakdown voltage (60V), maximum collector current (3A), package type (SOT-223 variants), and operating temperature range (-55°C to 150°C). Parts meeting these core electrical specifications are classified as direct substitutes. Parts with reduced collector current ratings (1A or 1.5A) or reduced power dissipation are classified as partial substitutes suitable only for applications with lower current demands. Transition frequency and saturation voltage variations are secondary considerations and do not prevent substitution when primary electrical ratings are met.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)max	Power (Max)	Frequency	Vce Sat @ Ic	Package	Status
DZT651-13	Diodes Incorporated	3A	60V	1W	200MHz	600mV @ 3A	SOT-223-3	Obsolete
FZT651QTA	Diodes Incorporated	3A	60V	3W	175MHz	600mV @ 3A	SOT-223-3	Active
FZT651TA	Diodes Incorporated	3A	60V	2W	175MHz	600mV @ 3A	SOT-223-3	Active
NZT560	onsemi	3A	60V	1W	75MHz	450mV @ 3A	SOT-223-4	Active
NZT560A	onsemi	3A	60V	1W	75MHz	400mV @ 3A	SOT-223-4	Active
2STN1360	STMicroelectronics	3A	60V	1.6W	130MHz	500mV @ 3A	SOT-223	Active
BCP55	onsemi	1.5A	60V	1.5W	—	SOT-223-4	Active
BCP55,115	Nexperia USA Inc.	1A	60V	1.35W	180MHz	500mV @ 500mA	SOT-223	Active
BCP55-10,115	Nexperia USA Inc.	1A	60V	1.35W	180MHz	500mV @ 500mA	SOT-223	Active
BCP55-16,115	Nexperia USA Inc.	1A	60V	1.35W	180MHz	500mV @ 500mA	SOT-223	Active
BSP41,115	Nexperia USA Inc.	1A	60V	1.3W	100MHz	500mV @ 500mA	SOT-223	Active

Engineering Selection Recommendations

Direct Substitutes (Full Electrical Compatibility):

FZT651QTA, FZT651TA, NZT560, NZT560A, and 2STN1360 are direct substitutes meeting the 3A collector current and 60V breakdown voltage specifications. FZT651QTA and FZT651TA are manufactured by Diodes Incorporated and maintain identical electrical ratings to the DZT651-13 with enhanced power dissipation (2W to 3W). Both parts carry Active product status and ROHS3 compliance. NZT560 and NZT560A from onsemi provide equivalent current and voltage ratings with Active status. The 2STN1360 from STMicroelectronics meets all primary electrical specifications and carries Active product status.

Partial Substitutes (Reduced Current Rating):

BCP55, BCP55,115, BCP55-10,115, BCP55-16,115, and BSP41,115 are suitable only for applications requiring maximum collector currents of 1A to 1.5A. These parts maintain the 60V breakdown voltage and SOT-223 package compatibility but cannot support the full 3A rating of the DZT651-13. All partial substitutes carry Active product status and ROHS3 compliance. BSP41,115 includes AEC-Q100 automotive qualification.

Compliance and Availability:

All substitute parts listed carry ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). FZT651QTA includes AEC-Q101 automotive qualification. Inventory availability ranges from 932 to 44,020 pieces across all substitutes, ensuring supply continuity.

Frequently Asked Questions (FAQ)

Q: Can FZT651QTA or FZT651TA directly replace DZT651-13 in existing designs?

A: Yes. FZT651QTA and FZT651TA maintain identical collector current (3A), breakdown voltage (60V), saturation voltage (600mV @ 3A), and operating temperature range (-55°C to 150°C). Both are manufactured by Diodes Incorporated and packaged in SOT-223-3. Enhanced power dissipation (2W to 3W versus 1W) provides additional thermal margin.

Q: What is the difference between NZT560 and NZT560A?

A: Both parts are manufactured by onsemi and rated for 3A collector current and 60V breakdown voltage in SOT-223-4 packaging. NZT560A provides improved DC current gain (250 @ 500mA, 2V versus 100 @ 500mA, 2V) and lower saturation voltage (400mV @ 3A versus 450mV @ 3A). Both are Active status parts suitable for direct substitution.

Q: Can BCP55 variants replace DZT651-13?

A: BCP55 variants are suitable only for applications with maximum collector currents of 1A or 1.5A. The DZT651-13 is rated for 3A; therefore, BCP55 variants cannot support full-current operation. Use BCP55 variants only when application current requirements are confirmed below 1.5A maximum.

Q: Are there package compatibility considerations between SOT-223-3 and SOT-223-4?

A: SOT-223-3 and SOT-223-4 packages differ in pin count. SOT-223-3 contains three pins (Base, Collector, Emitter), while SOT-223-4 contains four pins with an additional Collector pin for improved current distribution. PCB layout modifications may be required when transitioning between these package variants. Verify footprint compatibility before design implementation.

Q: Which substitute offers the best thermal performance?

A: FZT651QTA provides maximum power dissipation at 3W, compared to 1W for the DZT651-13. This enhanced thermal capability reduces junction temperature rise under identical operating conditions and extends device reliability in thermally constrained applications.

Q: Do all substitutes meet automotive qualification requirements?

A: FZT651QTA carries AEC-Q101 automotive qualification. BSP41,115 carries AEC-Q100 automotive qualification. Remaining substitutes do not carry automotive qualifications. Automotive applications must specify FZT651QTA or BSP41,115 based on current requirements.

Q: What is the significance of transition frequency differences?

A: DZT651-13 operates at 200MHz transition frequency. Substitutes range from 75MHz (NZT560, NZT560A) to 180MHz (BCP55 variants). Lower transition frequency does not prevent substitution in DC or low-frequency switching applications. High-frequency applications above 75MHz should prioritize FZT651QTA, FZT651TA, or BCP55 variants to maintain performance margins.

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