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Diodes Incorporated ZXTAM322TA
- Part No.:
- ZXTAM322TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-PowerSMD, Flat Leads
- Datasheet:
-
ZXTAM322TA.pdf
- Description:
- TRANS NPN 15V 4.5A 3MLP/DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,096
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Product details
Overview
ZXTAM322TA from Diodes Incorporated (formerly Zetex) is a 15V NPN low-saturation transistor in a 2mm × 2mm MLP package, rated for 4.5A continuous collector current, 100mV max VCE(sat) at 1A, and 83°C/W junction-to-ambient thermal resistance on standard PCB layout - optimized for high-efficiency DC-DC converter FET drivers and compact power switches.
For engineers reviewing the ZXTAM322TA datasheet, ZXTAM322TA pinout, ZXTAM322TA application, or ZXTAM322TA equivalent, key selection criteria include ultra-low saturation voltage under high-current switching, thermal performance on minimal copper area, hFE stability up to 12A, and compatibility with space-constrained motor control and battery charging circuits.
Technical Context
This NPN bipolar transistor employs a 4th-generation silicon process enabling sub-100mV saturation voltage at 1A with 50mA base drive, supporting fast-switching operation in synchronous rectifier and gate-drive stages. Its hFE is specified from 10mA to 12A, ensuring linear gain behavior across wide load ranges.
The device uses an exposed-pad MLP322 package with thermal vias directly beneath the die, delivering RθJA as low as 42°C/W with 65cm² 2oz copper - critical for thermally constrained DC-DC modules where traditional SOT-23 or TO-252 devices exceed height or thermal limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 15 V - Maximum safe collector-emitter blocking voltage in common-emitter configuration |
| VCE(sat) @ 1A | ≤100 mV - Enables <100mW conduction loss at 1A, reducing heat generation in high-duty-cycle switches |
| IC Continuous | 4.5 A - Sustained current handling without derating on standard 10cm² 1oz FR4 board |
| hFE @ 12A | ≥80 - Confirmed current gain at full-rated load, supporting robust base drive design |
| fT | 80–120 MHz - Supports switching frequencies up to ~10 MHz with adequate gain margin |
| RθJA (min) | 42 °C/W - Achievable with 65cm² 2oz copper, enabling 2.45W dissipation at TA=25°C |
| Tj Range | −55 to +150 °C - Qualified for automotive under-hood and industrial motor-control ambient conditions |
Pinout & Package
Package: 2mm × 2mm MLP322 (Micro Leaded Package), 0.9mm nominal height, exposed thermal pad on underside, JEDEC-compliant land pattern with 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Low-impedance return path; connected to exposed thermal pad for enhanced heat transfer |
| 2 (Base) | Control input | Receives current-limited drive signal; requires ≥50mA for full 4.5A saturation |
| 3 (Collector) | Power output | High-current switched node; electrically and thermally coupled to top-side metal slug |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low VCE(sat) | 100mV max at 1A - cuts conduction loss by >50% vs. standard SOT-23 transistors |
| High-current hFE specification | hFE ≥80 at IC = 12A - enables predictable base drive sizing across full load range |
| Thermally optimized MLP package | RθJA = 42°C/W with 2oz copper - supports 2.45W continuous dissipation in tight layouts |
| Compact footprint | 2mm × 2mm area - saves >60% PCB space vs. SO-8 or DPAK alternatives |
Applications
| Battery Charging Circuits | DC-DC Converter FET Drivers |
|---|---|
Use Scenario: High-efficiency linear or switching charger ICs requiring low-loss pass transistor for USB-PD or multi-cell Li-ion systems. IC Role / Device Role: NPN switch controlling charging current path between input source and battery terminal. Use Value: 100mV VCE(sat) minimizes voltage drop and thermal rise during constant-current phase, improving charge accuracy and thermal safety. | Use Scenario: Gate-driving high-side N-channel MOSFETs in buck or boost converters operating at 500kHz–2MHz. IC Role / Device Role: Low-saturation switch in bootstrap or level-shifted driver stage. Use Value: Fast ton/toff (120/160ns) and stable hFE ensure precise timing control and reduced shoot-through risk. |
| Motor Control H-Bridge Legs | Load Switches in Portable Devices |
Use Scenario: Low-voltage (≤12V) brushed DC motor drives in robotics or medical pumps where board height is limited to <1.2mm. IC Role / Device Role: Low-side switch in half-bridge configuration with integrated freewheeling path. Use Value: 0.9mm profile and 4.5A rating allow direct replacement of larger packages while maintaining torque response and thermal headroom. | Use Scenario: Power sequencing and rail enablement in wearables, IoT sensors, and handheld diagnostics equipment. IC Role / Device Role: Compact, low-RDS(on)-equivalent discrete switch replacing MOSFETs in cost-sensitive designs. Use Value: 45mΩ effective on-resistance (derived from VCE(sat)/IC) enables <50mW loss at 1A, eliminating need for heatsinking in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-saturation NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN617MA | Successor part with identical 2mm×2mm MLP package, 15V VCEO, but improved VCE(sat) (85mV max @1A) and higher hFE (≥100 @12A) | Drop-in replacement with tighter parametric distribution; preferred for new designs requiring extended lifetime support | Select ZXTN617MA for production ramp; ZXTAM322TA remains viable for legacy repair or inventory utilization |
| DMT3006LPS-7 | 60V NPN in 2mm×2mm WDFN; VCE(sat) = 140mV @1A; lower hFE (≥50 @12A); no exposed thermal pad | Higher voltage rating suits 24V industrial inputs, but thermal performance lags due to non-exposed pad | Choose only if system requires >15V blocking; otherwise ZXTAM322TA delivers superior efficiency and thermal margin |
Compared with ZXTN617MA and DMT3006LPS-7, ZXTAM322TA offers the best balance of ultra-low saturation voltage, verified high-current gain, and proven thermal performance in space-constrained 12V power rails - making it optimal for cost-sensitive, volume-manufactured DC-DC and charging modules where obsolescence risk is mitigated by documented second-source availability.
Availability
ZXTAM322TA is available at Aetrix Electronics and suitable for DC-DC converter FET drivers, battery charging circuits, and motor control H-bridge legs requiring stable component supply across industrial, medical, and portable electronics programs.
Supply support for ZXTAM322TA 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 acquired Zetex plc in 2008 and maintains its portfolio of high-performance discrete semiconductors focused on power efficiency and miniaturization.
ZXTAM322TA belongs to the Zetex Miniature Package Power Solutions (MPPS™) product line, engineered specifically for space- and thermal-constrained DC-DC conversion, battery management, and motor drive applications demanding sub-millimeter height and ultra-low conduction loss.
FAQ
Is ZXTAM322TA pin-compatible with ZXTN617MA?
Yes - both use identical MLP322 (2mm × 2mm) package outline and pin 1–3 assignment (Emitter–Base–Collector). Land pattern, solder stencil, and reflow profile are fully interchangeable, enabling seamless migration without PCB redesign.
What is the maximum allowable PCB copper area for optimal thermal performance?
Maximum thermal benefit is achieved with 65cm² of 2oz copper (RθJA = 42°C/W). However, functional operation is guaranteed down to 10cm² of 1oz copper (RθJA = 83°C/W), supporting compact 4-layer boards typical in portable power modules.
Can ZXTAM322TA be used in linear regulator applications?
No - its absolute maximum VCEO is 15V and continuous power dissipation is limited to 1.5W on standard layout. Linear regulators require sustained operation in active region with higher VCE; this device is optimized for saturated switching only.
Does the exposed thermal pad require electrical connection?
Yes - the underside thermal pad is internally connected to the collector. It must be soldered to a dedicated collector-copper pour with ≥4 thermal vias (0.3mm diameter) to achieve published RθJA values and prevent thermal runaway under 4.5A load.
ZXTAM322TA 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):
- 4.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 15 V
- Vce Saturation (Max) @ Ib, Ic:
- 280mV @ 50mA, 4.5A
- Current - Collector Cutoff (Max):
- 25nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 3A, 2V
- Power - Max:
- 3 W
- Frequency - Transition:
- 120MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 3-MLP/DFN (2x2)
ZXTAM322TA FAQ
1.How can I place an order for ZXTAM322TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXTAM322TA 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 ZXTAM322TA reliable?
The price and inventory of ZXTAM322TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTAM322TA is usually 5 days.
3.What payment methods are accepted for ZXTAM322TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTAM322TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXTAM322TA?
ZXTAM322TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXTAM322TA 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 ZXTAM322TA?
For technical support, including ZXTAM322TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTAM322TA requirements.
6.How does Aetrix verify that ZXTAM322TA is sourced from the original manufacturer or authorized distributors?
All ZXTAM322TA 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 ZXTAM322TA meets industry standards.
7.What is the process for return or replacement of ZXTAM322TA?
All ZXTAM322TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXTAM322TA, 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 ZXTAM322TA part is unused and in its original packaging.
Return procedure for ZXTAM322TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZXTAM322TA Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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