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

Diodes Incorporated ZX5T955ZTA

Name: ZX5T955ZTA
Brand: Diodes Incorporated
SKU: ZX5T955ZTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZX5T955ZTA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: ZX5T955ZTA.pdf

Description:: TRANS PNP 140V 3A SOT-89-3

Quantity:: RFQ Add To RFQ list

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Inventory:582

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Product details

Overview

ZX5T955ZTA from Zetex Semiconductors is a 140V PNP medium-power bipolar transistor in SOT89 package, designed for high-side switching and DC-DC power management with -140V V_CEO, -3A continuous I_C, and -37mV typical V_CE(sat) at -0.1A/-5mA drive-used in SLIC, motor drivers, and line-switching circuits.

For engineers reviewing the ZX5T955ZTA datasheet, ZX5T955ZTA pinout, ZX5T955ZTA application, or ZX5T955ZTA equivalent, this device delivers verified low-saturation performance in high-voltage PNP switching roles with documented thermal resistance (R_JA = 60°C/W on 50mm×50mm PCB) and pulsed switching times (t_on = 42ns, t_off = 636ns).

Technical Context

This PNP transistor employs 5th-generation low-saturation process technology to achieve V_CE(sat) as low as -37mV at light load and -255mV at full -3A conduction, enabling efficient high-side switch operation in DC-DC converters and telecom line interfaces. Its -140V BV_CEO and -180V BVCBO ratings support robust isolation in 48V–100V system rails.

The device exhibits h_FE = 45–100 at -3A/-5V, f_T = 120MHz at -100mA/-10V, and COBO = 33pF at -10V, confirming suitability for medium-speed switching with controlled capacitive loading and predictable gain roll-off above audio frequencies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-140V - supports safe operation in 100V-class telecom and industrial power rails
I_C (cont.)	-3A - enables direct driving of small motors or solenoids without external buffering
V_CE(sat)	-255mV @ -3A/-300mA - reduces conduction loss to ≤0.77W at full load
R_JA	60°C/W - allows 2.1W dissipation at 25°C ambient on 50mm×50mm PCB
t_off	636ns - limits switching loss in <200kHz PWM applications
h_FE	45 min @ -3A - ensures reliable base drive margin in saturated switch mode
f_T	120MHz - supports stable linear amplification up to ~10MHz with gain >10

Pinout & Package

Packaged in SOT89 outline (JEDEC TO-243AA), with 3-pin surface-mount configuration: emitter-tabbed heatsink pad, standard leadframe geometry per Zetex Package Outline Issue 2 (D=4.5mm, E=4.0mm, H=2.75mm).

Pin/Terminal	Circuit Role	Design Meaning
Collector (C)	Main current sink terminal	Connected to high-voltage rail in high-side switch; electrically isolated from tab
Base (B)	Control input	Receives negative current to turn on; requires -300mA for full -3A saturation
Emitter (E)	Current source / reference node	Internally bonded to metal tab; must be connected to system ground or low-side return

Key Features

Feature	Design Value
Low V_CE(sat) at high current	-255mV @ -3A ensures <0.8W conduction loss in 12–48V high-side switches
High voltage blocking	-140V V_CEO enables direct use in -48V telecom SLIC and industrial control buses
Thermal performance	R_JA = 60°C/W on 50mm×50mm PCB supports 2.1W continuous dissipation without forced cooling
Fast switching	t_on/t_off = 42ns/636ns enables clean transitions in <200kHz PWM power stages

Applications

Motor Driving

Line Switching

Use Scenario: Driving 24V brushed DC motors in industrial actuators requiring reverse polarity control.

IC Role / Device Role / Timing Role: High-side PNP switch controlling motor supply rail; operated in saturation with fixed base drive.

Use Value: -255mV V_CE(sat) at -3A limits heat generation to <0.8W, eliminating need for heatsink in sealed enclosures.

Use Scenario: Isolating and switching -48V telecom distribution lines in central office equipment.

IC Role / Device Role / Timing Role: High-voltage PNP line switch activated by microcontroller GPIO via level-shifting resistor network.

Use Value: -140V BV_CEO provides 20% margin over nominal -48V rail, ensuring long-term reliability under surge conditions.

High-Side Switches

Subscriber Line Interface Cards (SLIC)

Use Scenario: Controlling power to analog front-end circuitry in battery-backed metering systems.

IC Role / Device Role / Timing Role: PNP-based high-side power switch enabling zero-current shutdown and rail decoupling.

Use Value: Low -37mV V_CE(sat) at light load (-0.1A) minimizes standby power loss in always-on monitoring functions.

Use Scenario: Providing loop feed and battery backup switching in VoIP SLIC modules.

IC Role / Device Role / Timing Role: PNP transistor handling -48V loop current sourcing and polarity reversal during hookswitch events.

Use Value: Verified -10A peak pulse rating supports transient overload during line fault detection without latch-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS12201CF8T1G	-100V V_CEO, -2A I_C, -200mV V_CE(sat) @ -2A	Limited to ≤-48V systems; lower current capacity	Select when board space is constrained (SOT-23) and voltage stress remains below -80V
Diodes Incorporated DXT695BKQ-13	-160V V_CEO, -3A I_C, -350mV V_CE(sat) @ -3A	Higher saturation loss reduces efficiency in thermally limited designs	Prefer where higher voltage margin is critical and thermal headroom exceeds 1.5W

Compared with NSS12201CF8T1G and DXT695BKQ-13, ZX5T955ZTA uniquely balances -140V rating, -3A capability, and -255mV saturation at full load-making it optimal for thermally sensitive -48V to -100V high-side switching where both voltage margin and conduction loss matter.

Availability

ZX5T955ZTA is available at Aetrix Electronics and suitable for motor driving, line switching, high-side power control, and subscriber line interface cards requiring stable component supply across industrial, telecom, and embedded design cycles.

Supply support for ZX5T955ZTA 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

Zetex Semiconductors Ltd (now part of Diodes Incorporated) is a UK-based ISO 9001/TS16949-certified manufacturer specializing in high-performance discrete semiconductors.

This device belongs to Zetex's 5th-generation low-saturation PNP transistor family, engineered specifically for high-efficiency, high-voltage switching in telecom infrastructure and industrial power management.

FAQ

What is the maximum allowable junction temperature for ZX5T955ZTA?

The absolute maximum junction temperature is +150°C, with storage temperature range matching at -55°C to +150°C. Operation above 125°C requires derating power dissipation per the linear derating factor of 16.8mW/°C on 50mm×50mm PCB, limiting usable power to ~1.3W at 125°C ambient.

Can ZX5T955ZTA be used in avalanche mode?

No-this device is not rated or characterized for repetitive avalanche operation. Its BVCER rating (-180V) applies only under specified test conditions with R_B < 1kΩ; sustained operation beyond BV_CEO risks permanent degradation due to unclamped energy dissipation.

Is the emitter tab electrically connected to the emitter pin?

Yes-the metal tab is internally bonded to the emitter (E) terminal and serves as both mechanical anchor and thermal path. PCB layout must connect the tab pad exclusively to the emitter net; floating or misconnected tabs cause thermal runaway or parametric shift.

What base drive current is required to fully saturate ZX5T955ZTA at -3A collector current?

A minimum of -300mA base current is required to achieve -255mV V_CE(sat) at -3A collector current, corresponding to h_FE ≈ 10 at saturation. Base resistors must be sized to deliver this current from the driver stage while accounting for V_BE(sat) = -910mV typical at this operating point.

ZX5T955ZTA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 3 A

Voltage - Collector Emitter Breakdown (Max):: 140 V

Vce Saturation (Max) @ Ib, Ic:: 330mV @ 300mA, 3A

Current - Collector Cutoff (Max):: 20nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 1A, 5V

Power - Max:: 2.1 W

Frequency - Transition:: 120MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

ZX5T955ZTA FAQ

1.How can I place an order for ZX5T955ZTA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZX5T955ZTA 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 ZX5T955ZTA reliable?

The price and inventory of ZX5T955ZTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZX5T955ZTA is usually 5 days.

3.What payment methods are accepted for ZX5T955ZTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZX5T955ZTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZX5T955ZTA?

ZX5T955ZTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZX5T955ZTA 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 ZX5T955ZTA?

For technical support, including ZX5T955ZTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZX5T955ZTA requirements.

6.How does Aetrix verify that ZX5T955ZTA is sourced from the original manufacturer or authorized distributors?

All ZX5T955ZTA 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 ZX5T955ZTA meets industry standards.

7.What is the process for return or replacement of ZX5T955ZTA?

All ZX5T955ZTA units undergo pre-shipment inspection (PSI). If there is an issue with ZX5T955ZTA, 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 ZX5T955ZTA part is unused and in its original packaging.

Return procedure for ZX5T955ZTA:

1.Submit a request within 90 days.

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

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