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

Nexperia USA Inc. PZTA44/ZLX

Name: PZTA44/ZLX
Brand: Nexperia USA Inc.
SKU: PZTA44/ZLX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZTA44/ZLX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: PZTA44/ZLX.pdf

Description:: TRANS NPN 400V 0.3A SOT-223

Quantity:: RFQ Add To RFQ list

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Inventory:9,197

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Product details

Overview

PZTA44/ZLX from Nexperia is an NPN high-voltage bipolar junction transistor in SOT223 (SC-73) package, rated for 400 V V_CEO, 300 mA I_C, and 1.35 W P_tot at T_amb ≤ 25 °C; used in high-voltage switching stages of telecom line interface circuits.

For engineers reviewing the PZTA44/ZLX datasheet, PZTA44/ZLX pinout, PZTA44/ZLX application, or PZTA44/ZLX equivalent, key selection criteria include verified V_CEO = 400 V, h_FE ≥ 40 at I_C = 1 mA, R_th(j-sp) = 10 K/W, and dual-collector thermal pad configuration in SOT223.

Technical Context

This discrete NPN transistor operates as a high-voltage switch with open-base V_CEO = 400 V and V_CBO = 500 V, supporting telecommunication line drivers requiring robust breakdown margin and low leakage (I_CBO ≤ 10 µA at T_j = 150 °C).

Its SOT223 package integrates two collector terminals (Pins 2 and 4) sharing a common thermal pad, enabling enhanced power dissipation (R_th(j-sp) = 10 K/W) versus standard SOT23 devices while maintaining surface-mount compatibility.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Maximum collector-emitter voltage with base open; defines safe operating range in high-side switching applications.
I_C	300 mA - Continuous DC collector current; sets upper limit for steady-state load drive capability.
h_FE	40–200 - DC current gain at V_CE = 10 V; determines required base drive for saturation in linear or switching modes.
V_CE(sat)	750 mV max at I_C = 50 mA, I_B = 5 mA - Low saturation voltage minimizes conduction loss in on-state operation.
R_th(j-sp)	10 K/W - Junction-to-solder-point thermal resistance; enables direct PCB copper pad heat extraction without heatsink.
f_T	20 MHz - Transition frequency at V_CE = 10 V, I_C = 10 mA; supports moderate-speed switching up to ~1–2 MHz.

Pinout & Package

SOT223 (SC-73) plastic surface-mount package with 4 leads, 2.3 mm pitch, 6.5 mm × 3.5 mm × 1.65 mm body, and integrated thermal pad connected to dual collector terminals.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input node; requires current-limited drive to achieve target h_FE-based collector current.
2	Collector (C)	Primary high-voltage output terminal; electrically and thermally tied to Pin 4 and thermal pad.
3	Emiter (E)	Reference node for biasing; connects to ground or low-side return path in common-emitter configuration.
4	Collector (C)	Secondary collector terminal; shares same internal node as Pin 2 to improve thermal spreading and current handling.

Key Features

Feature	Design Value
Dual-collector thermal architecture	Two collector pins (2 & 4) bonded to shared die and thermal pad, reducing R_th(j-sp) to 10 K/W for improved power handling.
High-voltage isolation	V_CBO = 500 V ensures margin against transient overvoltage in telecom line interfaces and relay drivers.
Low leakage at elevated temperature	I_CBO ≤ 10 µA at T_j = 150 °C maintains stable off-state blocking in hot environments.
Stable h_FE across temperature	h_FE remains ≥ 40 from –55 °C to 150 °C (Fig. 1), enabling reliable gain in wide-temperature industrial designs.

Applications

Telecom Line Interface

Industrial Relay Driver

Use Scenario: High-voltage AC/DC line feeding and ringing generation in analog telephone interface cards.

IC Role / Device Role / Timing Role: NPN switching transistor controlling 48–90 V DC feed current and 20–30 V_pp 20 Hz ringing signal.

Use Value: 400 V V_CEO withstands peak line transients; dual-collector layout sustains 300 mA pulsed feed current without thermal runaway.

Use Scenario: Driving 24–48 V DC coils of industrial electromechanical relays in PLC I/O modules.

IC Role / Device Role / Timing Role: High-side or low-side switch providing coil energization/de-energization control.

Use Value: 500 V V_CBO rating suppresses inductive kickback spikes; 1.35 W P_tot allows continuous duty at 200 mA coil current.

AC Mains Detection

High-Voltage Sensor Bias

Use Scenario: Zero-crossing detection and mains presence sensing in smart energy meters and HVAC controllers.

IC Role / Device Role / Timing Role: Voltage-level translator and current amplifier isolating microcontroller inputs from 120/230 V AC lines.

Use Value: 400 V V_CEO enables direct connection to rectified mains; low I_CBO ensures minimal false-triggering during standby.

Use Scenario: Providing stable bias current to high-voltage photodiodes or piezoelectric sensors in test equipment.

IC Role / Device Role / Timing Role: Constant-current source delivering precise 1–100 µA to sensor anodes under 100–400 V reverse bias.

Use Value: h_FE stability over temperature ensures ±5% current accuracy; low C_c = 7 pF avoids signal coupling distortion.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-voltage switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD44H11	V_CEO = 400 V, I_C = 8 A, TO-220 package, R_th(j-a) = 2.5 K/W	Higher current, larger footprint, requires heatsink; unsuitable for space-constrained SMT designs	Select when >300 mA continuous current or forced-air cooling is needed; not drop-in for SOT223 layouts.
ZTX653	V_CEO = 300 V, I_C = 1 A, SOT89 package, R_th(j-a) = 60 K/W	Lower voltage rating, higher thermal resistance, single-collector construction	Acceptable only if system max V_CE < 270 V and ambient < 60 °C; requires derating for reliability.

Compared with MJD44H11 and ZTX653, PZTA44/ZLX uniquely balances 400 V rating, SOT223 mountability, and dual-collector thermal performance-making it optimal for compact, high-reliability telecom and industrial switching where board area and thermal management are constrained.

Availability

PZTA44/ZLX is available at Aetrix Electronics and suitable for telecom line interface, industrial relay driver, and AC mains detection applications requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.

Supply support for PZTA44/ZLX 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with core competencies in automotive, industrial, and consumer power management.

PZTA44/ZLX belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for robust switching in telecom infrastructure, industrial controls, and energy metering systems demanding 400 V+ breakdown and SMT thermal efficiency.

FAQ

What is the maximum allowable junction temperature for PZTA44/ZLX?

The absolute maximum junction temperature (T_j) is 150 °C per IEC 60134 limiting values. Operation above this threshold risks permanent degradation of h_FE and increased leakage. Thermal design must ensure T_j stays below 150 °C under worst-case ambient and power dissipation conditions, using R_th(j-sp) = 10 K/W as the primary thermal path reference.

Can PZTA44/ZLX be used in avalanche mode?

No-PZTA44/ZLX is not characterized or rated for controlled avalanche operation. Its Absolute Maximum Ratings define only safe operating area (SOA) limits under forward-biased conditions. Avalanche energy handling is unspecified, and intentional operation beyond V_CEO = 400 V may cause irreversible device failure.

Is the marking "PZTA44" on the device body sufficient for full traceability?

Yes-the top-side marking "PZTA44" matches the type number in the official Nexperia data sheet (v.3, 20221001) and corresponds to the SC-73 package variant with dual-collector configuration. No date code or lot identifier is required for functional identification; full traceability is maintained via Aetrix's documented sourcing from authorized Nexperia distribution channels.

How does the dual-collector pinout affect PCB layout?

Pins 2 and 4 are internally shorted to the same collector node and thermal pad. PCB layout must connect both pins to the same copper pour-ideally a ≥1 cm² tin-plated FR4 pad-to realize the specified R_th(j-sp) = 10 K/W. Separating these pins or routing them to different nets violates the thermal and electrical design intent and degrades SOA performance.

PZTA44/ZLX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 300 mA

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 5mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 10mA, 10V

Power - Max:: 1.35 W

Frequency - Transition:: 20MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

PZTA44/ZLX FAQ

1.How can I place an order for PZTA44/ZLX through Aetrix?

Please submit a Request for Quotation (RFQ) for PZTA44/ZLX 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 PZTA44/ZLX reliable?

The price and inventory of PZTA44/ZLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZTA44/ZLX is usually 5 days.

3.What payment methods are accepted for PZTA44/ZLX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZTA44/ZLX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZTA44/ZLX?

PZTA44/ZLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZTA44/ZLX 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 PZTA44/ZLX?

For technical support, including PZTA44/ZLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZTA44/ZLX requirements.

6.How does Aetrix verify that PZTA44/ZLX is sourced from the original manufacturer or authorized distributors?

All PZTA44/ZLX 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 PZTA44/ZLX meets industry standards.

7.What is the process for return or replacement of PZTA44/ZLX?

All PZTA44/ZLX units undergo pre-shipment inspection (PSI). If there is an issue with PZTA44/ZLX, 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 PZTA44/ZLX part is unused and in its original packaging.

Return procedure for PZTA44/ZLX:

1.Submit a request within 90 days.

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

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