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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi NZT6729

Name: NZT6729
Brand: onsemi
SKU: NZT6729
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NZT6729

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: NZT6729.pdf

Description:: TRANS PNP 80V 1A SOT-223-4

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NZT6729 from ON Semiconductor is a PNP general-purpose amplifier in SOT-223 package, rated for -80 V V_CEO, -1 A continuous collector current, and 1.0 W power dissipation at 25°C - designed for medium-power linear amplification and switching in industrial control and power management circuits.

For engineers reviewing the NZT6729 datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, thermal resistance (125°C/W), DC current gain range (20–250 at I_C = -50 mA to -500 mA), saturation voltage (-0.35 V at I_C = -250 mA, I_B = -25 mA), and SOT-223 thermal pad layout compatibility.

Technical Context

The NZT6729 is a silicon planar epitaxial PNP bipolar junction transistor optimized for medium-power analog amplification and saturated switching. Its process 79 fabrication ensures stable h_FE across temperature and consistent V_CE(sat) performance under pulsed and DC conditions.

It operates with a maximum junction temperature of 150°C and supports ambient ranges from -55°C to +150°C. Thermal design relies on the SOT-223 package's exposed collector tab, enabling PCB copper pour heat sinking per FR-4 land pattern guidelines.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-80 V - Maximum safe collector-emitter reverse bias before breakdown; defines usable voltage headroom in high-side switch or amplifier stages.
I_C (Continuous)	-1 A - Continuous DC collector current rating; sets upper limit for sustained load drive capability in relay drivers or power regulators.
P_D	1.0 W at T_A = 25°C - Total device power dissipation; requires thermal derating (8 mW/°C) above ambient, critical for enclosure-limited designs.
h_FE	20–250 - DC current gain range across I_C = -50 mA to -500 mA; enables predictable base drive sizing in linear and switching configurations.
V_CE(sat)	-0.35 V at I_C = -250 mA, I_B = -25 mA - Low saturation voltage minimizes conduction loss and self-heating in on-state switching applications.
R_θJA	125°C/W - Junction-to-ambient thermal resistance on standard FR-4 board; informs minimum copper area needed for thermal compliance.

Pinout & Package

SOT-223 4-lead plastic package with exposed collector tab (pin 2 and 4 tied internally to collector); thermally enhanced for surface-mount power handling.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input for forward-biased PNP operation; requires negative base current relative to emitter to turn on.
2 & 4	Collector	Internally connected pins forming main power output node; electrically and thermally coupled to exposed metal tab for heatsinking.
3	Emitter	Common reference terminal; typically tied to higher potential (e.g., V_CC) in high-side switch topologies.

Key Features

Feature	Design Value
High V_CEO rating	-80 V enables use in 48 V industrial bus systems and flyback snubber circuits without additional clamping.
Thermally robust SOT-223	Exposed collector tab allows >0.75 W dissipation with minimal PCB copper, reducing need for discrete heatsinks.
Wide h_FE range	20–250 supports both precision current mirror designs (high h_FE) and robust saturated switching (low h_FE tolerance).
Low V_CE(sat)	-0.35 V at I_C/I_B = 10 ensures <350 mW conduction loss at 1 A, improving efficiency in battery-powered switches.

Applications

Industrial Relay Driver	DC Motor Direction Control
Use Scenario: Driving 24 V/500 mA electromagnetic relays in PLC I/O modules with microcontroller-level base control. IC Role / Device Role / Timing Role: PNP high-side switch providing galvanically isolated load connection to positive rail. Use Value: -80 V V_CEO withstands inductive kickback; -0.35 V V_CE(sat) limits relay coil heating during continuous hold.	Use Scenario: Bidirectional H-bridge half-bridge leg for 12–24 V brushed DC motors in automated gate controllers. IC Role / Device Role / Timing Role: High-side PNP switch complementing NPN low-side devices in complementary pair configuration. Use Value: SOT-223 thermal pad enables 1 A peak motor current without thermal shutdown in enclosed enclosures.
Linear Voltage Regulator Pass Element	Power Supply Sequencing Circuit
Use Scenario: Series pass transistor in adjustable 5–15 V linear regulators delivering up to 800 mA for analog sensor subsystems. IC Role / Device Role / Timing Role: Medium-power PNP pass element controlled by error amplifier feedback loop. Use Value: Stable h_FE over temperature ensures consistent regulation accuracy; 150°C max T_J supports operation in sealed power supplies.	Use Scenario: Controlled power-up sequencing of multiple voltage rails (e.g., 12 V → 5 V → 3.3 V) in FPGA-based embedded systems. IC Role / Device Role / Timing Role: Delayed-enable PNP switch isolating downstream rails until upstream supply stabilizes. Use Value: -5 V V_EBO rating accommodates precise base bias networks using Zener references without emitter-base breakdown.

Industrial Relay Driver

DC Motor Direction Control

Use Scenario: Driving 24 V/500 mA electromagnetic relays in PLC I/O modules with microcontroller-level base control.

IC Role / Device Role / Timing Role: PNP high-side switch providing galvanically isolated load connection to positive rail.

Use Value: -80 V V_CEO withstands inductive kickback; -0.35 V V_CE(sat) limits relay coil heating during continuous hold.

Use Scenario: Bidirectional H-bridge half-bridge leg for 12–24 V brushed DC motors in automated gate controllers.

IC Role / Device Role / Timing Role: High-side PNP switch complementing NPN low-side devices in complementary pair configuration.

Use Value: SOT-223 thermal pad enables 1 A peak motor current without thermal shutdown in enclosed enclosures.

Linear Voltage Regulator Pass Element

Power Supply Sequencing Circuit

Use Scenario: Series pass transistor in adjustable 5–15 V linear regulators delivering up to 800 mA for analog sensor subsystems.

IC Role / Device Role / Timing Role: Medium-power PNP pass element controlled by error amplifier feedback loop.

Use Value: Stable h_FE over temperature ensures consistent regulation accuracy; 150°C max T_J supports operation in sealed power supplies.

Use Scenario: Controlled power-up sequencing of multiple voltage rails (e.g., 12 V → 5 V → 3.3 V) in FPGA-based embedded systems.

IC Role / Device Role / Timing Role: Delayed-enable PNP switch isolating downstream rails until upstream supply stabilizes.

Use Value: -5 V V_EBO rating accommodates precise base bias networks using Zener references without emitter-base breakdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD6729	Same die, TO-252 (DPAK) package; R_θJA = 62.5°C/W vs. NZT6729's 125°C/W; higher power handling (1.5 W).	Preferred where board space allows larger footprint and >1 W dissipation is required.	Select MJD6729 when thermal budget exceeds SOT-223 capability but same electrical behavior is needed.
PN2907A	Lower V_CEO (-60 V), lower I_C (-600 mA), TO-92 package; h_FE min 100 only at I_C = -150 mA.	Suitable for low-power signal switching (<300 mA), not for medium-power amplification or switching.	Choose PN2907A only for cost-sensitive, low-current logic-level interfaces - not as direct functional replacement.

Compared with MJD6729 and PN2907A, the NZT6729 delivers optimal balance of SMT manufacturability, thermal performance on compact boards, and full -80 V/-1 A capability - making it the preferred choice for space-constrained industrial power stages requiring reliable PNP switching.

Availability

NZT6729 is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor controls, and linear regulator pass elements requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for NZT6729 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor (formerly Fairchild Semiconductor) is a global leader in energy-efficient semiconductor solutions for automotive, industrial, cloud computing, and IoT applications.

The NZT6729 belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed for robust, cost-effective amplification and switching in industrial power electronics and control systems.

FAQ

What is the maximum operating temperature for the NZT6729?

The NZT6729 has a specified operating junction temperature range of -55°C to +150°C. Its storage temperature matches this range. For reliable long-term operation, keep the actual junction temperature below 150°C using appropriate PCB copper area and ambient airflow - especially critical given its 125°C/W thermal resistance in SOT-223 packaging.

Does the NZT6729 support pulsed operation beyond its DC ratings?

Yes, the NZT6729 supports pulsed operation with duty cycle ≤ 2.0% and pulse width ≤ 300 μs, as confirmed in its Absolute Maximum Ratings note. Pulse testing enables short-duration peak currents above -1 A while maintaining thermal safety - useful in motor start-up or solenoid actuation circuits where average power stays within 1.0 W limits.

How is the collector terminal configured in the SOT-223 package of the NZT6729?

In the NZT6729 SOT-223 package, the collector is connected to both pin 2 and pin 4, and also to the large exposed metal tab on the underside of the package. This dual-pin + thermal tab configuration provides low-inductance power routing and direct thermal conduction to the PCB, essential for stable high-current switching performance.

What is the typical h_FE value of the NZT6729 at I_C = -250 mA?

The NZT6729 exhibits a typical h_FE of 50 at I_C = -250 mA, V_CE = -1.0 V, and T_A = 25°C. This value falls within the guaranteed range of 20–250 and reflects realistic current gain for medium-power saturated switching - informing base resistor selection to ensure sufficient drive under worst-case beta variation.

Can the NZT6729 replace the older Fairchild FZT6729 in existing designs?

Yes, the NZT6729 is the direct successor to the Fairchild FZT6729 following ON Semiconductor's integration. The underscore-to-dash nomenclature change (FZT6729 → NZT6729) reflects system updates only - electrical specifications, pinout, package, and thermal behavior are identical, enabling drop-in replacement without layout or firmware changes.

NZT6729 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 10mA, 250mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 250mA, 1V

Power - Max:: 1 W

Frequency - Transition:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-4

NZT6729 FAQ

1.How can I place an order for NZT6729 through Aetrix?

Please submit a Request for Quotation (RFQ) for NZT6729 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for NZT6729 reliable?

The price and inventory of NZT6729 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZT6729 is usually 5 days.

3.What payment methods are accepted for NZT6729?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZT6729 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NZT6729?

NZT6729 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NZT6729 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for NZT6729?

For technical support, including NZT6729 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZT6729 requirements.

6.How does Aetrix verify that NZT6729 is sourced from the original manufacturer or authorized distributors?

All NZT6729 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NZT6729 meets industry standards.

7.What is the process for return or replacement of NZT6729?

All NZT6729 units undergo pre-shipment inspection (PSI). If there is an issue with NZT6729, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The NZT6729 part is unused and in its original packaging.

Return procedure for NZT6729:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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