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

onsemi PZTA64

Name: PZTA64
Brand: onsemi
SKU: PZTA64
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZTA64

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: PZTA64.pdf

Description:: TRANS PNP DARL 30V 1.2A SOT-223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PZTA64 from ON Semiconductor is a PNP Darlington transistor in SOT-223 package, delivering high DC current gain (h_FE ≥ 10,000 at I_C = −10 mA), V_CE(sat) ≤ −1.5 V at I_C = −100 mA / I_B = −0.1 mA, and continuous collector current up to −1.2 A. It operates across −55°C to +150°C and is used in high-gain switching applications such as relay drivers and power supply control circuits.

For engineers reviewing the PZTA64 datasheet, pinout, applications, or equivalent options, key selection considerations include its SOT-223 thermal performance (R_θJA = 125°C/W on FR-4 with 6 cm² collector pad), Darlington architecture enabling low base drive requirements, and −30 V V_CES/V_CBO rating for medium-voltage switching.

Technical Context

The PZTA64 implements a monolithic PNP Darlington pair with integrated base-emitter resistor network absent - requiring external base biasing. Its high h_FE and low V_CE(sat) stem from cascaded PNP transistor topology, optimized for linear and saturated switching modes at collector currents up to −1.2 A.

Thermal design relies on the SOT-223 package's exposed collector tab, which serves as both electrical terminal and primary heat path. The device's R_θJC = 83.3°C/W and R_θJA = 125°C/W (with 6 cm² copper pad) enable stable operation under sustained 1 W dissipation at ambient temperatures ≤ 75°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	−30 V - Maximum safe collector-emitter voltage before breakdown; defines upper limit for switching in 24 V industrial control rails.
I_C (continuous)	−1.2 A - Sustained collector current capability; supports driving relays, solenoids, or small motors without forced cooling.
h_FE	≥10,000 @ I_C = −10 mA - Enables microampere-level base drive; reduces MCU GPIO loading and simplifies driver stage design.
V_CE(sat)	≤ −1.5 V @ I_C = −100 mA, I_B = −0.1 mA - Low saturation voltage minimizes conduction loss and self-heating during on-state operation.
R_θJA	125°C/W - Achievable with 6 cm² PCB copper area under collector tab; allows ~0.8 W dissipation at T_A = 75°C before reaching T_J = 150°C.
f_T	125 MHz - Small-signal bandwidth; sufficient for PWM frequencies up to ~10–20 kHz with margin, but not intended for RF amplification.

Pinout & Package

SOT-223 package with exposed collector tab (pin 3) serving as primary thermal and electrical path; molded plastic body with three leads in standard EBC configuration.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal of Darlington pair	Connected to system ground or low-side return path; carries full load current in common-emitter configuration.
2 (Base)	Control input for Darlington pair	Receives base current to saturate output; requires external series resistor to limit I_B per h_FE target and V_BE(on) ≈ −2.0 V.
3 (Collector)	High-current output node	Exposed metal tab - must be soldered to ≥6 cm² copper pour for thermal management; connects to positive rail or load high side.

Key Features

Feature	Design Value
Monolithic PNP Darlington structure	Delivers h_FE ≥ 10,000 without external components - eliminates need for discrete two-transistor staging in space-constrained designs.
High V_CE(sat) tolerance at high I_C	Maintains ≤ −1.5 V saturation voltage even at −100 mA, enabling efficient switching in 12–24 V systems with minimal power loss.
SOT-223 thermal interface	Exposed collector tab enables direct PCB copper coupling - achieves 125°C/W R_θJA, outperforming TO-92 (200°C/W) and SOT-23 (357°C/W).
Wide operating temperature range	Rated from −55°C to +150°C - suitable for under-hood automotive modules, industrial motor controls, and outdoor power equipment.

Applications

Relay Driver Circuit	Linear Voltage Regulator Pass Element
Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules where microcontroller GPIOs cannot source sufficient current. IC Role / Device Role / Timing Role: High-gain PNP switch controlling relay coil current; operates in saturation mode with fixed on/off timing. Use Value: Eliminates need for additional pre-driver transistors - reduces BOM count and board area while maintaining <1 ms turn-on delay.	Use Scenario: Acting as pass transistor in adjustable linear regulators supplying 500 mA to analog sensor subsystems. IC Role / Device Role / Timing Role: Series pass element regulating output voltage; biased in active region for precise V_OUT control. Use Value: High h_FE lowers required base drive current, easing op-amp output stage design and improving load regulation stability.
DC Motor Direction Control (Low-Side)	Power Supply Enable Switch
Use Scenario: Controlling direction of small brushed DC motors in battery-powered tools using H-bridge configurations. IC Role / Device Role / Timing Role: Low-side PNP switch enabling reverse polarity drive; switched at ≤10 kHz PWM frequency. Use Value: Low V_CE(sat) minimizes conduction loss during active periods, extending battery runtime by reducing I²R heating.	Use Scenario: Enabling/disabling auxiliary 5 V or 3.3 V rails in multi-rail embedded systems based on system state signals. IC Role / Device Role / Timing Role: High-side enable switch placed between input supply and LDO input; operated in hard saturation. Use Value: −30 V V_CES rating accommodates input surges up to 28 V, ensuring reliable rail sequencing in automotive-grade power architectures.

Relay Driver Circuit

Linear Voltage Regulator Pass Element

Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules where microcontroller GPIOs cannot source sufficient current.

IC Role / Device Role / Timing Role: High-gain PNP switch controlling relay coil current; operates in saturation mode with fixed on/off timing.

Use Value: Eliminates need for additional pre-driver transistors - reduces BOM count and board area while maintaining <1 ms turn-on delay.

Use Scenario: Acting as pass transistor in adjustable linear regulators supplying 500 mA to analog sensor subsystems.

IC Role / Device Role / Timing Role: Series pass element regulating output voltage; biased in active region for precise V_OUT control.

Use Value: High h_FE lowers required base drive current, easing op-amp output stage design and improving load regulation stability.

DC Motor Direction Control (Low-Side)

Power Supply Enable Switch

Use Scenario: Controlling direction of small brushed DC motors in battery-powered tools using H-bridge configurations.

IC Role / Device Role / Timing Role: Low-side PNP switch enabling reverse polarity drive; switched at ≤10 kHz PWM frequency.

Use Value: Low V_CE(sat) minimizes conduction loss during active periods, extending battery runtime by reducing I²R heating.

Use Scenario: Enabling/disabling auxiliary 5 V or 3.3 V rails in multi-rail embedded systems based on system state signals.

IC Role / Device Role / Timing Role: High-side enable switch placed between input supply and LDO input; operated in hard saturation.

Use Value: −30 V V_CES rating accommodates input surges up to 28 V, ensuring reliable rail sequencing in automotive-grade power architectures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA64	TO-92 package; R_θJA = 200°C/W; lower I_C rating (−500 mA); same electrical specs otherwise.	Preferred for prototyping or low-power signal switching where thermal mass is less critical.	Select MPSA64 when board space is unrestricted and dissipation remains below 300 mW.
MMBTA64	SOT-23 package; R_θJA = 357°C/W; I_C = −500 mA; identical h_FE and V_CE(sat) specs.	Suitable for compact consumer electronics where footprint is constrained but power levels are modest.	Choose MMBTA64 only if thermal load stays under 150 mW and PCB layout permits minimal copper area.

Compared with MPSA64 and MMBTA64, the PZTA64 provides superior thermal handling and higher current capacity due to its SOT-223 package and 6 cm² copper requirement - making it the sole choice among the three for sustained >500 mA loads in industrial environments.

Availability

PZTA64 is available at Aetrix Electronics and suitable for relay driver circuits, linear regulator pass elements, DC motor control stages, and power supply enable switches requiring stable component supply and long-term industrial lifecycle support.

Supply support for PZTA64 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 is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and logic solutions for automotive, industrial, cloud computing, and consumer markets.

The PZTA64 belongs to ON Semiconductor's legacy Fairchild PNP Darlington transistor family, designed specifically for high-current, high-gain switching in industrial control, power conversion, and electromechanical actuation systems.

FAQ

What is the maximum continuous collector current rating for the PZTA64?

The PZTA64 has a maximum continuous collector current (I_C) rating of −1.2 A at T_A = 25°C with proper PCB thermal management. This rating assumes the SOT-223 collector tab is soldered to ≥6 cm² of 1 oz copper on FR-4. At elevated ambient temperatures or reduced copper area, derating applies per the 8.0 mW/°C slope shown in the datasheet.

Does the PZTA64 include an internal base-emitter resistor?

No, the PZTA64 does not integrate any base-emitter resistors. It is a bare Darlington pair requiring external base biasing - typically via a series resistor from controller GPIO to the base pin. Designers must calculate R_B based on target I_B, V_BE(on) ≈ −2.0 V, and available drive voltage to achieve desired h_FE-based saturation.

Can the PZTA64 replace the MPSA64 in an existing TO-92 design?

The PZTA64 cannot be used as a drop-in replacement for the MPSA64 due to different packages (SOT-223 vs. TO-92), pinouts, and thermal requirements. While electrically compatible in many circuits, the PZTA64 demands PCB redesign to accommodate its larger footprint, EBC pin order, and mandatory 6 cm² copper pour for thermal performance - no layout changes are possible without requalification.

What is the typical V_BE(on) voltage for the PZTA64 at I_C = −100 mA?

The typical base-emitter on voltage (V_BE(on)) for the PZTA64 is −2.0 V when tested at I_C = −100 mA and V_CE = −5.0 V. This reflects the combined forward voltage of two cascaded PNP emitter-base junctions and must be accounted for when sizing base drive resistors to ensure adequate I_B for saturation.

Is the PZTA64 suitable for use in automotive under-hood applications?

Yes, the PZTA64 is rated for operation from −55°C to +150°C junction temperature and meets industrial reliability standards inherited from Fairchild. Its SOT-223 thermal performance and −30 V breakdown ratings make it appropriate for non-safety-critical under-hood functions like fan control, heater relays, and sensor power switching - provided external circuit protection and layout comply with AEC-Q100 stress guidelines.

PZTA64 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP - 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

PZTA64 FAQ

1.How can I place an order for PZTA64 through Aetrix?

Please submit a Request for Quotation (RFQ) for PZTA64 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 PZTA64 reliable?

The price and inventory of PZTA64 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZTA64 is usually 5 days.

3.What payment methods are accepted for PZTA64?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZTA64 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZTA64?

PZTA64 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZTA64 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 PZTA64?

For technical support, including PZTA64 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZTA64 requirements.

6.How does Aetrix verify that PZTA64 is sourced from the original manufacturer or authorized distributors?

All PZTA64 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 PZTA64 meets industry standards.

7.What is the process for return or replacement of PZTA64?

All PZTA64 units undergo pre-shipment inspection (PSI). If there is an issue with PZTA64, 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 PZTA64 part is unused and in its original packaging.

Return procedure for PZTA64:

1.Submit a request within 90 days.

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

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