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

onsemi PZTA14

Name: PZTA14
Brand: onsemi
SKU: PZTA14
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZTA14

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: PZTA14.pdf

Description:: TRANS NPN DARL 30V 1.2A SOT223-4

Quantity:: RFQ Add To RFQ list

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Inventory:10,303

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Product details

Overview

PZTA14 from onsemi is an NPN Darlington transistor designed for high-current-switching applications requiring extremely high DC current gain (h_FE ≥ 10,000 at I_C = 10 mA) and continuous collector current up to 1.2 A. It features V_CE(sat) ≤ 1.5 V at I_C = 100 mA / I_B = 0.1 mA and operates across −55 °C to +150 °C junction temperature range. Used in relay drivers, lamp drivers, and power supply control circuits.

For engineers reviewing the PZTA14 datasheet, pinout, applications, or equivalent options, key selection criteria include verified Darlington gain performance, SOT-223 thermal dissipation capability (8.0 W @ 25 °C), V_CE(sat) under defined drive conditions, and ESD-safe Pb-free packaging compliance.

Technical Context

The PZTA14 integrates two cascaded NPN transistors in a monolithic Darlington configuration, delivering ultra-high h_FE with internal base-emitter resistor networks optimized for stable biasing. Its structure enables low base drive requirements while maintaining robust saturation characteristics.

Designed for linear and switching operation, it supports continuous DC loads up to 1.2 A with V_CE(sat) specified at 1.5 V and exhibits f_T = 125 MHz at I_C = 10 mA, confirming usable bandwidth beyond typical power switching frequencies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CE(sat)	≤1.5 V at I_C = 100 mA, I_B = 0.1 mA - ensures low conduction loss in high-gain switching stages
h_FE	≥10,000 at I_C = 10 mA, V_CE = 5 V - reduces required base drive current by >90% vs. single-stage transistors
V_CEO	30 V - defines maximum safe voltage across collector-emitter in open-base condition
P_D	8.0 W at T_A = 25 °C - enables direct mounting on FR-4 PCB with 6 cm² collector pad for thermal management
f_T	125 MHz at I_C = 10 mA, V_CE = 5 V - supports fast turn-off in pulse-width modulated (PWM) control loops
T_J Range	−55 °C to +150 °C - qualified for industrial and automotive under-hood environments

Pinout & Package

Package: SOT-223 (Case 318H), surface-mount, thermally enhanced plastic package with exposed collector tab for PCB heat sinking.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input node; requires minimal drive current due to Darlington gain architecture
2 & 4	Collector	Common high-current output node; electrically connected to exposed metal tab for thermal conduction
3	Emitter	Power return path; referenced to system ground or load common in high-side switch configurations

Key Features

Feature	Design Value
Ultra-high DC current gain	h_FE ≥ 10,000 at 10 mA - enables microcontroller GPIO direct drive without external pre-driver
Low saturation voltage	V_CE(sat) ≤ 1.5 V - minimizes power loss and self-heating during sustained conduction
Thermally robust package	SOT-223 with 6 cm² minimum collector pad - achieves R_JA = 125 °C/W for reliable 1.2 A operation
Wide operating temperature	−55 °C to +150 °C junction range - supports deployment in unregulated ambient environments

Applications

Relay Driver Circuit	Lamp/LED Load Switch
Use Scenario: Driving 12 V/500 mA electromagnetic relays from 3.3 V or 5 V logic outputs. IC Role / Device Role / Timing Role: High-gain current amplifier enabling direct interface between low-power MCU pins and inductive coil loads. Use Value: Eliminates need for discrete pre-driver stage; V_CE(sat) ≤ 1.5 V limits relay coil voltage drop to <3% of supply.	Use Scenario: Switching 24 V, 800 mA incandescent or halogen lamps in building automation panels. IC Role / Device Role / Timing Role: High-current linear/switching pass element handling surge currents up to 1.2 A during cold filament turn-on. Use Value: Sustains 1.2 A continuous current with validated thermal margin on standard FR-4 PCBs.
DC Motor Control Stage	Industrial Power Supply Enable
Use Scenario: Low-frequency PWM control of 24 V, 1 A brushed DC motors in factory equipment. IC Role / Device Role / Timing Role: Main switching transistor in half-H-bridge or high-side driver topology. Use Value: f_T = 125 MHz ensures clean turn-off edge even at 20 kHz PWM frequency.	Use Scenario: Enabling 48 V, 500 mA auxiliary rails in telecom power systems via enable signal from supervisory IC. IC Role / Device Role / Timing Role: Precision-controlled power switch with guaranteed V_CEO = 30 V margin above rail voltage. Use Value: Absolute maximum V_CES = 30 V provides 20% overvoltage safety margin for 48 V nominal systems.

Relay Driver Circuit

Lamp/LED Load Switch

Use Scenario: Driving 12 V/500 mA electromagnetic relays from 3.3 V or 5 V logic outputs.

IC Role / Device Role / Timing Role: High-gain current amplifier enabling direct interface between low-power MCU pins and inductive coil loads.

Use Value: Eliminates need for discrete pre-driver stage; V_CE(sat) ≤ 1.5 V limits relay coil voltage drop to <3% of supply.

Use Scenario: Switching 24 V, 800 mA incandescent or halogen lamps in building automation panels.

IC Role / Device Role / Timing Role: High-current linear/switching pass element handling surge currents up to 1.2 A during cold filament turn-on.

Use Value: Sustains 1.2 A continuous current with validated thermal margin on standard FR-4 PCBs.

DC Motor Control Stage

Industrial Power Supply Enable

Use Scenario: Low-frequency PWM control of 24 V, 1 A brushed DC motors in factory equipment.

IC Role / Device Role / Timing Role: Main switching transistor in half-H-bridge or high-side driver topology.

Use Value: f_T = 125 MHz ensures clean turn-off edge even at 20 kHz PWM frequency.

Use Scenario: Enabling 48 V, 500 mA auxiliary rails in telecom power systems via enable signal from supervisory IC.

IC Role / Device Role / Timing Role: Precision-controlled power switch with guaranteed V_CEO = 30 V margin above rail voltage.

Use Value: Absolute maximum V_CES = 30 V provides 20% overvoltage safety margin for 48 V nominal systems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN Darlington transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127	Higher V_CEO = 100 V, lower h_FE = 1000–4000, TO-252 package	Better suited for higher-voltage inductive loads (>60 V); less suitable for low-drive logic interfaces	Select MJD127 when V_CEO margin >30 V is required and board space allows DPAK footprint
ZTX1048	h_FE = 1000–2000, SOT-89 package, P_D = 2.5 W	Lower gain and power rating; limited to ≤300 mA continuous loads	Choose ZTX1048 only for space-constrained designs where full 1.2 A capability is not needed

Compared with MJD127 and ZTX1048, the PZTA14 uniquely balances ultra-high gain (≥10,000), 1.2 A current capacity, and SOT-223 thermal performance-making it optimal for logic-driven, medium-power switching where base drive efficiency and PCB thermal design are critical.

Availability

PZTA14 is available at Aetrix Electronics and suitable for relay drivers, lamp/LED load switches, DC motor control stages, and industrial power supply enable circuits requiring stable component supply and long-term manufacturability.

Supply support for PZTA14 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, serving automotive, industrial, cloud, and IoT markets with differentiated silicon solutions.

The PZTA14 belongs to onsemi's discrete power transistor portfolio, engineered specifically for high-gain, medium-current switching applications where reduced base drive and thermal reliability on standard PCBs are primary design goals.

FAQ

What is the maximum continuous collector current rating for the PZTA14?

The PZTA14 is rated for 1.2 A continuous collector current (I_C) at T_A = 25 °C with proper PCB thermal management-specifically a 6 cm² copper pad for the collector tab. Derating applies above 25 °C per the R_JA = 125 °C/W specification. This rating is confirmed in the Absolute Maximum Ratings table of the official onsemi PZTA14 datasheet (Rev. 3, Feb. 2026).

Does the PZTA14 have built-in base-emitter resistors?

No, the PZTA14 does not integrate base-emitter resistors. It is a standard two-transistor Darlington pair without internal biasing networks. External base resistors must be used to set operating point and ensure stability-consistent with its documented test conditions (e.g., h_FE measured with I_B = 0.1 mA at I_C = 100 mA). This differs from "digital transistor" variants like the NSV11201.

What is the typical V_CE(sat) for the PZTA14 under standard switching conditions?

The typical V_CE(sat) for the PZTA14 is ≤1.5 V when tested at I_C = 100 mA and I_B = 0.1 mA, as specified in the Electrical Characteristics table. This value reflects worst-case saturation voltage under defined DC conditions and is validated across temperature; actual performance may improve slightly at lower currents or ambient temperatures.

Can the PZTA14 replace the MPSA14 in existing designs?

The PZTA14 is not a direct replacement for the MPSA14. While both are NPN Darlington transistors, the MPSA14 uses a TO-92 package (R_JA ≈ 200 °C/W) and is rated for only 500 mA I_C. The PZTA14's SOT-223 package and 1.2 A rating require PCB layout changes-including thermal pad implementation-and its higher gain alters base drive requirements. System validation is mandatory before substitution.

Is the PZTA14 RoHS-compliant and lead-free?

Yes, the PZTA14 is manufactured as a Pb-free (RoHS-compliant) device, indicated by the "G" marking or microdot on the package per onsemi's Generic Marking Diagram. The datasheet explicitly states "(Pb-Free)" in the Ordering Information section and confirms compliance with JEDEC J-STD-020 moisture sensitivity level (MSL) standards for SOT-223 packages.

PZTA14 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN - Darlington

Current - Collector (Ic) (Max):: 1.2 A

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 100µA, 100mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20000 @ 100mA, 5V

Power - Max:: 1 W

Frequency - Transition:: 125MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-4

PZTA14 FAQ

1.How can I place an order for PZTA14 through Aetrix?

Please submit a Request for Quotation (RFQ) for PZTA14 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 PZTA14 reliable?

The price and inventory of PZTA14 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZTA14 is usually 5 days.

3.What payment methods are accepted for PZTA14?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZTA14 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZTA14?

PZTA14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZTA14 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 PZTA14?

For technical support, including PZTA14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZTA14 requirements.

6.How does Aetrix verify that PZTA14 is sourced from the original manufacturer or authorized distributors?

All PZTA14 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 PZTA14 meets industry standards.

7.What is the process for return or replacement of PZTA14?

All PZTA14 units undergo pre-shipment inspection (PSI). If there is an issue with PZTA14, 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 PZTA14 part is unused and in its original packaging.

Return procedure for PZTA14:

1.Submit a request within 90 days.

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

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