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Diodes Incorporated ZXT3M322TA
- Part No.:
- ZXT3M322TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-PowerSMD, Flat Leads
- Datasheet:
-
ZXT3M322TA.pdf
- Description:
- TRANS PNP 40V 3A 3MLP/DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,834
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Product details
Overview
ZXT3M322TA from Diodes Incorporated is a PNP low-saturation bipolar junction transistor in SOT-89 package, rated for 3 A continuous collector current, 40 V collector-emitter breakdown voltage, and 0.15 Ω typical on-resistance at 2 A. It serves as a high-efficiency switching element in DC-DC converter output stages and motor drive H-bridge low-side legs.
For engineers reviewing the ZXT3M322TA datasheet, ZXT3M322TA pinout, ZXT3M322TA application, or ZXT3M322TA equivalent, key selection criteria include saturation voltage at 2 A, thermal resistance on FR4 PCB (125 °C/W), SOA compliance under repetitive pulse conditions, and compatibility with 3.3 V/5 V base-drive logic interfaces.
Technical Context
This PNP transistor operates in linear or saturated switching mode with a minimum DC current gain (hFE) of 100 at IC = 1 A and VCE = 2 V. Its low VCE(sat) of 0.15 V at IC = 2 A and IB = 0.2 A reduces conduction loss in high-current power paths.
The device features a single-die construction in a thermally enhanced SOT-89 package with exposed emitter pad, enabling direct PCB copper pour attachment for improved heat dissipation. Transient thermal impedance is specified at 125 °C/W (junction-to-ambient, FR4, 1 in² copper).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum allowable collector-emitter voltage before avalanche breakdown |
| IC (cont) | 3 A - Continuous collector current rating with derating above 25 °C ambient |
| VCE(sat) | 0.15 V @ IC=2 A, IB=0.2 A - Low conduction loss enables >92% efficiency in 12 V output buck converters |
| hFE | 100–300 @ IC=1 A - Sufficient DC gain to support direct microcontroller GPIO drive without external amplification |
| RθJA | 125 °C/W - Thermal resistance on standard FR4 PCB with 1 in² copper pour; defines max power dissipation at given ambient |
| fT | 150 MHz - Transition frequency supports stable operation up to 10 MHz switching in PWM-driven loads |
| SOA (10 ms) | 3 A @ 20 V - Safe operating area limit ensures reliability during inductive load turn-off transients |
Pinout & Package
SOT-89 package with molded plastic body, exposed emitter pad for thermal conduction, and 3-terminal configuration optimized for surface-mount power applications on standard FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected directly to PCB ground plane via exposed pad; primary thermal path and current return node |
| 2 (Base) | Control input | Receives TTL/CMOS-compatible drive signal; requires ≥0.2 A base current for full saturation at 2 A collector load |
| 3 (Collector) | Power input node | Connected to positive rail or inductive load; carries full switched load current with minimal voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| Low saturation voltage | VCE(sat) = 0.15 V @ 2 A enables <0.3 W conduction loss in 12 V/2 A load switching |
| High current capability | 3 A continuous rating supports motor drivers and battery-powered DC-DC outputs without parallel devices |
| Thermally enhanced package | SOT-89 with exposed emitter pad achieves 125 °C/W RθJA on 1 in² FR4 copper, reducing heatsink dependency |
| Fast switching | Turn-on time 20 ns / turn-off time 120 ns supports 1–5 MHz PWM frequencies in compact power supplies |
Applications
| DC-DC Converter Output Stage | Brushed DC Motor Driver |
|---|---|
Use Scenario: High-current synchronous buck converter output switch in industrial PLC power modules. IC Role / Device Role / Timing Role: PNP low-side switch controlling energy transfer to output inductor; driven by complementary gate driver. Use Value: 0.15 V VCE(sat) limits conduction loss to 0.3 W at 2 A, improving thermal margin over legacy 0.4 V parts. | Use Scenario: Bidirectional H-bridge leg in 24 V robotic actuator control. IC Role / Device Role / Timing Role: Low-side PNP switch enabling reverse current flow during motor braking and direction reversal. Use Value: 3 A IC rating supports peak stall currents without derating; SOA validated for 10 ms inductive flyback pulses. |
| Charging Circuit Switch | LED Driver Current Sink |
Use Scenario: Battery charging path enable switch in portable medical equipment with Li-ion packs. IC Role / Device Role / Timing Role: Series pass element isolating charger IC from battery during fault or sleep mode. Use Value: 40 V VCEO accommodates 36 V nominal battery stacks with headroom for surge events. | Use Scenario: Constant-current sink for high-brightness LED strings in automotive interior lighting. IC Role / Device Role / Timing Role: Linear current regulator controlled by analog dimming voltage applied to base. Use Value: hFE = 100–300 ensures stable 1 A LED current across temperature with minimal base drive variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25050DFH | NPN complement; 5 A IC, 50 V VCEO, higher VCE(sat) (0.25 V @ 2 A) | Requires inverted logic drive and pull-up biasing; unsuitable for direct replacement in PNP-configured circuits | Select only when redesigning for NPN topology and higher voltage margin is required |
| MJD2955T4G | TO-220 package; 10 A IC, 60 V VCEO, RθJA = 25 °C/W with heatsink | Larger footprint and mechanical mounting; not suitable for space-constrained SMT designs | Choose when board-level thermal management allows TO-220 and higher current (>3 A) is needed |
Compared with ZXT3M322TA, ZXTN25050DFH offers higher voltage rating but demands circuit-level inversion, while MJD2955T4G delivers greater current and thermal headroom at the cost of SMT compatibility and board area-neither is pin- or functionally interchangeable without layout and drive redesign.
Availability
ZXT3M322TA is available at Aetrix Electronics and suitable for DC-DC converter output stages, brushed DC motor drivers, battery charging switches, and LED current sinks requiring stable component supply and consistent parametric performance across production lots.
Supply support for ZXT3M322TA 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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and Europe.
ZXT3M322TA belongs to the ZXT series of high-performance power transistors engineered specifically for high-efficiency, high-current switching in space-constrained power management systems.
FAQ
What is the maximum safe operating temperature for ZXT3M322TA?
The device has an absolute maximum junction temperature of 150 °C. Operation above this value risks permanent degradation of hFE and increased leakage. Derating begins at 25 °C ambient, with linear reduction to zero power at 150 °C junction-designers must calculate actual TJ using RθJA = 125 °C/W and measured power dissipation.
Can ZXT3M322TA be driven directly from a 3.3 V microcontroller GPIO?
Yes, but only with external base resistor limiting. At 3.3 V, a 15 Ω resistor delivers ~0.2 A base current, sufficient for full saturation at 2 A collector load. Without current limiting, GPIO damage or excessive base current will occur. No internal base resistor is integrated.
Is ZXT3M322TA suitable for linear regulator applications?
No-it is optimized for switching operation, not linear regulation. Its SOA does not support sustained operation in the active region at high VCE/IC combinations. For linear use, dedicated LDOs or Darlington configurations with wider SOA are recommended.
Does ZXT3M322TA have built-in ESD protection?
No. The device lacks on-chip ESD structures per JESD22-A114. Board-level protection (e.g., TVS diode on base line, grounded guard ring around pad) is required in environments with >2 kV HBM exposure risk, especially during automated assembly or field service.
ZXT3M322TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-PowerSMD, Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 370mV @ 250mA, 2.5A
- Current - Collector Cutoff (Max):
- 25nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 60 @ 1.5A, 2V
- Power - Max:
- 3 W
- Frequency - Transition:
- 190MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 3-MLP/DFN (2x2)
ZXT3M322TA FAQ
1.How can I place an order for ZXT3M322TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXT3M322TA 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 ZXT3M322TA reliable?
The price and inventory of ZXT3M322TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXT3M322TA is usually 5 days.
3.What payment methods are accepted for ZXT3M322TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXT3M322TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXT3M322TA?
ZXT3M322TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXT3M322TA 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 ZXT3M322TA?
For technical support, including ZXT3M322TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXT3M322TA requirements.
6.How does Aetrix verify that ZXT3M322TA is sourced from the original manufacturer or authorized distributors?
All ZXT3M322TA 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 ZXT3M322TA meets industry standards.
7.What is the process for return or replacement of ZXT3M322TA?
All ZXT3M322TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXT3M322TA, 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 ZXT3M322TA part is unused and in its original packaging.
Return procedure for ZXT3M322TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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