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Diodes Incorporated ZXTEM322TA
- Part No.:
- ZXTEM322TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-PowerSMD, Flat Leads
- Datasheet:
-
ZXTEM322TA.pdf
- Description:
- TRANS NPN 80V 3.5A 3MLP/DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
ZXTEM322TA from Zetex Semiconductors is a 4th-generation NPN low-saturation transistor in a 2mm × 2mm MLP package, rated for VCEO = 80 V, IC = 3.5 A continuous, and VCE(sat) ≤ 185 mV at 1 A; designed for high-efficiency DC-DC converters, motor control switches, and power management stages where low conduction loss and minimal PCB footprint are critical.
For engineers reviewing the ZXTEM322TA datasheet, ZXTEM322TA pinout, ZXTEM322TA application, or ZXTEM322TA equivalent, key selection criteria include verified saturation voltage at 3.5 A, thermal resistance under defined PCB copper conditions (RJA = 42–83 °C/W), hFE stability up to 5 A, and MLP322 package compatibility with automated SMT assembly.
Technical Context
This device operates as a single NPN bipolar junction transistor optimized for switching-its low VCE(sat) (15–240 mV across 0.1–3.5 A) and high hFE (90–450 at IC = 10 mA to 5 A) enable efficient on-state conduction while maintaining controllability under wide current ranges. It features a 0.9 mm nominal package height and exposed thermal pad for enhanced heat dissipation.
The MLP322 outline uses three terminals (Collector, Base, Emitter) with internal leadframe design supporting RJA as low as 42 °C/W on 65 cm² 2 oz copper, and specifies absolute maximum ratings including VCBO = 100 V, TJ = 150 °C, and ICM = 5 A peak pulse current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 80 V - supports DC-DC primary-side switching up to 65 V rail with 23% safety margin |
| IC (continuous) | 3.5 A - enables 5 W–7 W power stage operation without forced cooling on standard FR4 |
| VCE(sat) max | 185 mV @ IC = 1 A, IB = 20 mA - limits conduction loss to ≤185 mW per switch event |
| hFE | 90–450 - ensures reliable base drive scaling from 10 mA to 300 mA across full load range |
| RJA min | 42 °C/W - achievable with 65 cm² 2 oz copper, enabling 1.2 W continuous dissipation at ΔT = 50 °C |
| fT | 100–160 MHz - sufficient for PWM frequencies up to 2 MHz with controlled switching transitions |
| Package | MLP322 (2.0 × 2.0 × 0.9 mm) - 40% smaller footprint than SOT-23, compatible with 0.4 mm pitch reflow |
Pinout & Package
Package: MLP322 - 3-terminal micro-leaded package with exposed thermal pad (pin 1 = Collector, pin 2 = Base, pin 3 = Emitter), 2.0 mm × 2.0 mm body, 0.9 mm height, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Top Mark Side Left) | Collector | Main current output path; internally connected to exposed thermal pad for direct PCB heat sinking |
| Pin 2 (Center) | Base | Control input requiring 20–300 mA drive for full saturation across 0.1–3.5 A load range |
| Pin 3 (Right) | Emitter | Reference node for biasing; tied to ground or low-side return in common-emitter configurations |
Key Features
| Feature | Design Value |
|---|---|
| Low saturation voltage | VCE(sat) ≤ 185 mV @ 1 A - reduces I²R losses by >40% vs. standard NPNs in 5–12 V DC-DC stages |
| High-current hFE specification | hFE ≥ 90 @ IC = 3 A - guarantees predictable base drive requirements up to rated current |
| Thermally enhanced MLP package | RJA = 42 °C/W with 65 cm² 2 oz copper - enables 1.2 W continuous operation without heatsink |
| Compact footprint | 2 mm × 2 mm area - saves >60% board space vs. SOT-23 while maintaining thermal performance |
| Low profile | 0.9 mm height - allows integration into ultra-thin power modules and stacked PCB assemblies |
Applications
| DC-DC Converters | Motor Control Drivers |
|---|---|
|
Use Scenario: Step-down (buck) converter in portable medical devices operating from 12 V input to 3.3 V/2 A output. IC Role / Device Role / Timing Role: Main switching transistor in high-side configuration, driven by PWM controller at 500 kHz. Use Value: 185 mV VCE(sat) limits conduction loss to 370 mW, enabling >92% efficiency without forced airflow. |
Use Scenario: H-bridge low-side driver for 24 V brushed DC motor in industrial actuator (0.5–2 A load). IC Role / Device Role / Timing Role: Low-side switch controlling motor direction and PWM speed regulation. Use Value: Stable hFE ≥ 90 at 2 A ensures consistent gate drive for external MOSFETs or direct motor current switching. |
| Power Management ICs | LED Driver Circuits |
|
Use Scenario: Load switch in battery-powered IoT node managing 5 V system rail sequencing. IC Role / Device Role / Timing Role: Controlled on/off pass element with fast turn-on (<86 ns) and turn-off (1128 ns) for clean power ramping. Use Value: Low VCE(sat) minimizes dropout voltage (≤200 mV), preserving battery runtime during active periods. |
Use Scenario: Constant-current sink for high-brightness white LED string (350 mA, 12 V supply). IC Role / Device Role / Timing Role: Linear current regulator with emitter-follower feedback loop. Use Value: Tight VBE(sat) tolerance (1.09–1.175 V) ensures ±3% current accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN low-saturation transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN620MA | Higher VCEO (100 V), lower VCE(sat) (120 mV @ 1 A), same MLP322 package | Better suited for 48 V input DC-DC; replaces ZXTEM322TA in new designs per manufacturer notice | Select when upgrading for higher input voltage margin or tighter thermal constraints |
| DMT3006LPS | 60 V VCEO, 4.5 A IC, 1.2 V VBE(on), PowerDI5060 package (3.3 × 3.3 mm) | Larger footprint but higher current rating; requires different PCB layout and thermal pad design | Choose only if 3.5 A limit is insufficient and board area permits larger package |
Compared with ZXTEM322TA, ZXTN620MA offers improved voltage rating and lower saturation loss in identical packaging, while DMT3006LPS trades size for higher current capacity-neither is pin-compatible, requiring layout revision for adoption.
Availability
ZXTEM322TA is available at Aetrix Electronics and suitable for DC-DC converters, motor control drivers, and power management ICs requiring stable component supply and legacy design support.
Supply support for ZXTEM322TA 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 plc (now part of Diodes Incorporated) specialized in high-performance analog and power transistors, with focus on efficiency-critical discrete solutions for industrial and portable electronics.
ZXTEM322TA belongs to Zetex's Miniature Package Power Solutions (MPPS) product line, engineered to replace larger SOT packages in space-constrained power switching applications without sacrificing thermal or electrical performance.
FAQ
Is ZXTEM322TA still recommended for new designs?
No-Zetex explicitly marks ZXTEM322TA as obsolete and recommends ZXTN620MA as its direct replacement. The newer part improves VCEO to 100 V and reduces VCE(sat) while retaining the MLP322 footprint, making it suitable for upgraded 48 V systems without PCB redesign.
What is the thermal pad connection requirement for MLP322?
The MLP322 package includes an exposed thermal pad (connected to Collector) that must be soldered to a minimum 1.22 × 1.42 mm copper area on the PCB. For RJA = 42 °C/W, this pad must connect to ≥65 cm² of 2 oz copper; insufficient copper reduces power handling to ≤420 mW.
Can ZXTEM322TA be used in linear regulator applications?
Yes-it supports linear operation with VBE(on) = 0.96–1.05 V and hFE ≥ 90 up to 3 A, but power dissipation is limited by RJA. At 1 A and 5 V drop, it dissipates 5 W, requiring aggressive copper heatsinking (RJA ≤ 10 °C/W) to stay within 150 °C TJ.
What does "OBSOLETE - PLEASE USE ZXTN620MA" mean for existing stock?
It indicates Zetex discontinued ZXTEM322TA manufacturing and no longer guarantees long-term supply. Aetrix Electronics maintains limited legacy inventory for repair and maintenance, but new designs must use ZXTN620MA to ensure future availability and technical support.
ZXTEM322TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-PowerSMD, Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 3.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 325mV @ 300mA, 3.5A
- Current - Collector Cutoff (Max):
- 25nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 200mA, 2V
- Power - Max:
- 3 W
- Frequency - Transition:
- 160MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 3-MLP/DFN (2x2)
ZXTEM322TA FAQ
1.How can I place an order for ZXTEM322TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXTEM322TA 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 ZXTEM322TA reliable?
The price and inventory of ZXTEM322TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTEM322TA is usually 5 days.
3.What payment methods are accepted for ZXTEM322TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTEM322TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXTEM322TA?
ZXTEM322TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXTEM322TA 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 ZXTEM322TA?
For technical support, including ZXTEM322TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTEM322TA requirements.
6.How does Aetrix verify that ZXTEM322TA is sourced from the original manufacturer or authorized distributors?
All ZXTEM322TA 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 ZXTEM322TA meets industry standards.
7.What is the process for return or replacement of ZXTEM322TA?
All ZXTEM322TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXTEM322TA, 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 ZXTEM322TA part is unused and in its original packaging.
Return procedure for ZXTEM322TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZXTEM322TA Tags
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Diodes Incorporated
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Diodes Incorporated
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