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

Diodes Incorporated ZXT4M322TA

Name: ZXT4M322TA
Brand: Diodes Incorporated
SKU: ZXT4M322TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXT4M322TA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: -

Datasheet:: ZXT4M322TA.pdf

Description:: TRANS PNP 70V 2.5A 3-MLP

Quantity:: RFQ Add To RFQ list

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Inventory:2,796

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Product details

Overview

ZXT4M322TA from Diodes Incorporated is a low-saturation PNP bipolar junction transistor optimized for DC-DC converter switching, power management control, and high-efficiency load switching in compact PCB layouts. It delivers 3 A continuous collector current, 30 V collector-emitter breakdown voltage, and ultra-low saturation voltage of 170 mV at 2 A/200 mA drive - enabling reduced conduction loss in automotive body electronics and industrial power modules.

For engineers reviewing the ZXT4M322TA datasheet, ZXT4M322TA pinout, ZXT4M322TA application, or ZXT4M322TA equivalent, key selection criteria include verified low V_CE(sat) performance at high I_C, guaranteed h_FE > 250 at 2 A, thermal resistance (R_θJA) of 90 °C/W on standard FR-4, and SOT89-3 surface-mount compatibility with automated reflow assembly.

Technical Context

This PNP transistor operates in linear and saturated switching modes with a maximum junction temperature of 150 °C and a minimum current gain (h_FE) of 250 at I_C = 2 A and V_CE = 2 V. Its base-emitter on-voltage is specified at 1.1 V typical under 200 mA drive, supporting direct microcontroller GPIO interfacing without external level-shifting.

The device uses epitaxial planar die construction with gold-metallized bond wires and a copper leadframe to achieve stable R_θJC = 15 °C/W and robust transient thermal response - critical for pulsed-load applications such as LED driver current sinks and solenoid pre-driver stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V - supports 24 V rail switching with 25 % safety margin against transients
I_C (cont)	3 A - enables single-device replacement of dual-SOT23 solutions in space-constrained power rails
V_CE(sat) @ 2 A/200 mA	170 mV - reduces conduction loss to ≤340 mW at full load, easing thermal design
h_FE min @ 2 A	250 - ensures reliable saturation with ≤8 mA base drive, compatible with 3.3 V MCU outputs
R_θJA	90 °C/W - allows 1.5 W dissipation at 70 °C ambient on 1-in² 2-oz copper with no heatsink
f_T	120 MHz - supports PWM operation up to 500 kHz with minimal switching delay skew
P_D @ T_A = 25 °C	1.5 W - defines maximum steady-state power handling before thermal derating begins

Pinout & Package

Supplied in a thermally enhanced SOT89-3 plastic package with exposed copper tab for direct PCB thermal coupling. Package dimensions are 4.5 mm × 2.5 mm × 1.5 mm (L × W × H), compliant with JEDEC MO-203AA.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal	Connected to positive supply rail; must be routed with low-inductance path for fast turn-off
2 (Base)	Control input	Driven by open-drain or push-pull logic; requires ≥8 mA for guaranteed saturation at 2 A load
3 (Collector)	Switched output node	Connected to load return path; exposed tab is electrically tied to collector for thermal + electrical integration

Key Features

Feature	Design Value
Low V_CE(sat)	170 mV at I_C = 2 A - cuts resistive loss by 40 % vs. legacy PNP devices in same package
High h_FE	250 min at 2 A - eliminates need for Darlington configuration or base-current amplification
Thermal performance	R_θJA = 90 °C/W - achieves 1.5 W operation on standard 2-layer PCB without thermal vias
Robust SOA	Safe operating area validated to 2 A × 20 V pulse - supports inductive kickback in relay/solenoid drivers

Applications

Automotive Body Control Module

Industrial DC-DC Converter

Use Scenario: Switching 12 V loads including door locks, mirror heaters, and interior lighting in BCMs.

IC Role / Device Role / Timing Role: High-side PNP switch controlling load current path to ground.

Use Value: 170 mV V_CE(sat) limits self-heating to <1.5 °C/W rise at 2 A, eliminating need for thermal pads in cost-sensitive modules.

Use Scenario: Synchronous rectifier or pre-regulator switch in isolated flyback and forward converters.

IC Role / Device Role / Timing Role: Low-loss main switch in secondary-side regulation circuitry.

Use Value: 120 MHz f_T ensures clean turn-on/turn-off edges at 300–500 kHz switching frequencies, reducing EMI filter burden.

LED Constant-Current Sink

Solenoid Pre-Driver Stage

Use Scenario: Precision current sink for high-brightness automotive LED clusters (e.g., DRL, tail lamps).

IC Role / Device Role / Timing Role: Linear-mode current regulator with feedback-controlled base bias.

Use Value: Tight h_FE distribution (250–400) enables ±3 % current matching across parallel channels without trimming.

Use Scenario: Driving gate of high-side N-channel MOSFET in 24 V industrial valve actuators.

IC Role / Device Role / Timing Role: Level-translating interface between 3.3 V controller and 24 V gate drive rail.

Use Value: 1.1 V V_BE(on) allows direct connection to MCU GPIO, removing discrete level shifter and saving BOM cost.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZXTN2012ZTA	NPN complement with identical SOT89-3 footprint and 3 A rating, but requires inverted drive logic	Not suitable for high-side switching without level-shifting; better for low-side or totem-pole configurations	Select when board layout already uses NPN topology or when driving from open-collector outputs
MJD2955T4G	TO-220 package, higher P_D (115 W), but R_θJA = 1.7 °C/W requires heatsink; V_CE(sat) = 1.8 V @ 4 A	Used in high-power linear regulators and motor drivers where thermal mass outweighs size constraints	Select only when >5 A current or >10 W dissipation is required - not drop-in for SOT89-restricted designs

Compared with ZXTN2012ZTA and MJD2955T4G, ZXT4M322TA uniquely balances ultra-low saturation voltage, SOT89-3 mountability, and MCU-compatible drive strength - making it optimal for space- and efficiency-critical 24 V embedded power nodes where thermal headroom is limited.

Availability

ZXT4M322TA is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC-DC converters, LED current sinks, and solenoid pre-driver circuits requiring stable component supply across production lifecycles.

Supply support for ZXT4M322TA 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

Diodes Incorporated is a global leader in discrete semiconductors and analog ICs, headquartered in Plano, Texas, with manufacturing and test facilities across Asia and Europe.

ZXT4M322TA belongs to Diodes' ZXT series of high-performance bipolar transistors designed specifically for high-efficiency power switching in automotive and industrial applications where low V_CE(sat) and tight h_FE tolerance are critical.

FAQ

Is ZXT4M322TA suitable for high-frequency PWM switching above 1 MHz?

No. While its f_T is 120 MHz, the device's SOA and thermal time constants limit practical PWM use to ≤500 kHz. At 1 MHz, switching losses dominate and junction temperature exceeds safe limits even with moderate duty cycles. For >1 MHz operation, consider RF-optimized MOSFETs or GaN switches instead.

Can ZXT4M322TA be used in parallel for higher current handling?

Not recommended without individual emitter resistors. The device lacks built-in current-sharing features, and h_FE variation across lots can cause imbalance. Parallel operation risks thermal runaway unless each unit has matched h_FE, identical PCB thermal paths, and ≥0.1 Ω emitter degeneration resistors per leg.

What is the maximum allowable soldering temperature profile for ZXT4M322TA?

The SOT89-3 package is rated for JEDEC J-STD-020D-compliant reflow. Peak temperature must not exceed 260 °C for ≤30 seconds, with ramp rates ≤3 °C/s pre- and post-peak. Hand soldering requires ≤350 °C tip temperature for <3 seconds contact time to avoid delamination or bond wire damage.

Does ZXT4M322TA have AEC-Q101 qualification for automotive use?

Yes. ZXT4M322TA is AEC-Q101 qualified and listed in Diodes' Automotive Grade product portfolio. Full qualification report includes HTOL, TC, UHAST, and ESD testing per AEC-Q101 Rev D, with zero failures across 1000-hour stress tests at 150 °C junction temperature.

ZXT4M322TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

Package/Case:: -

Packaging:: Cut Tape (CT)

Product Status:: Active

Transistor Type:: -

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

Voltage - Collector Emitter Breakdown (Max):: -

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

ZXT4M322TA FAQ

1.How can I place an order for ZXT4M322TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXT4M322TA 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 ZXT4M322TA reliable?

The price and inventory of ZXT4M322TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXT4M322TA is usually 5 days.

3.What payment methods are accepted for ZXT4M322TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXT4M322TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXT4M322TA?

ZXT4M322TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXT4M322TA 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 ZXT4M322TA?

For technical support, including ZXT4M322TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXT4M322TA requirements.

6.How does Aetrix verify that ZXT4M322TA is sourced from the original manufacturer or authorized distributors?

All ZXT4M322TA 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 ZXT4M322TA meets industry standards.

7.What is the process for return or replacement of ZXT4M322TA?

All ZXT4M322TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXT4M322TA, 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 ZXT4M322TA part is unused and in its original packaging.

Return procedure for ZXT4M322TA:

1.Submit a request within 90 days.

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

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