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Diodes Incorporated FZT489QTA
- Part No.:
- FZT489QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT489QTA.pdf
- Description:
- TRANS NPN 30V 1A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,939
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Product details
Overview
FZT489QTA from Diodes Incorporated is a 30V, 1A NPN medium-power transistor in SOT223 package, designed for switching and linear amplification in industrial power supplies and motor drivers. It delivers low VCE(sat) (0.3V at IC=1A/IB=100mA), supports 4A peak pulse current, and operates across –55°C to +150°C ambient range.
For engineers reviewing the FZT489QTA datasheet, FZT489QTA pinout, FZT489QTA application, or FZT489QTA equivalent, key selection criteria include guaranteed BVCEO ≥30V, hFE = 100–300 at IC = 1mA–1A, thermal resistance RθJA = 41.7°C/W on 50mm×50mm 2oz copper, and RoHS-compliant matte tin plating.
Technical Context
This NPN bipolar junction transistor uses epitaxial planar die construction with optimized base doping for stable DC current gain across temperature. Its 3.0W power dissipation rating and low saturation voltage enable efficient operation in high-duty-cycle switching circuits without forced cooling.
The device features complementary PNP pairing with FZT589, enabling push-pull and H-bridge topologies. ESD robustness (4kV HBM) and halogen/antimony-free "Green" molding compound meet automotive-grade reliability requirements per AEC-Q101 qualification (FZT489Q variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Ensures safe operation in 24V rail systems with transient margin |
| IC (continuous) | 1 A - Supports sustained load switching in fan controllers and LED drivers |
| VCE(sat) | 0.3 V @ IC=1A/IB=100mA - Minimizes conduction loss and self-heating |
| hFE | 100–300 - Provides predictable base drive sizing across operating current range |
| fT | 150 MHz - Enables use in low-noise preamplifier stages up to mid-frequency bands |
| RθJA | 41.7 °C/W - Allows 3.0W dissipation with ≤125°C junction rise on standard PCB layout |
| ESD HBM | 4,000 V - Reduces handling sensitivity during manual assembly and board test |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin configuration with collector tab (pin 3) thermally enhanced for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current return path; connected to ground or low-side reference in switch configurations |
| 2 (Base) | B | Control input requiring ~100mA drive for full saturation at 1A collector load |
| 3 (Collector) | C | Main power output terminal; electrically and thermally tied to exposed copper pad on PCB |
| 4 (Collector Tab) | C (redundant) | Primary thermal interface; must be soldered to ≥50mm² 2oz copper for rated 3.0W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | 0.3V at 1A enables >95% efficiency in 24V DC-DC synchronous rectifier designs |
| High ICM | 4A peak pulse rating supports inrush current limiting in solenoid and relay driver circuits |
| Wide TJ range | –55°C to +150°C operation allows deployment in under-hood automotive modules and industrial enclosures |
| RoHS & Green compliance | Halogen-free, antimony-free, lead-free finish meets IPC-J-STD-020 Level 1 moisture sensitivity |
| Complementary PNP pair | FZT589 enables matched push-pull stage design without gain or thermal mismatch penalties |
Applications
| Industrial Power Supply | Brushed DC Motor Driver |
|---|---|
Use Scenario: Regulated 24V output stage in DIN-rail mounted AC/DC converters. IC Role / Device Role / Timing Role: NPN switch controlling primary-side current in linear regulator or pass element in LDO auxiliary supply. Use Value: Low VCE(sat) reduces dropout voltage and thermal load, enabling compact heatsinkless design. | Use Scenario: Half-bridge high-side switch in 12V–24V brushed motor control for HVAC actuators. IC Role / Device Role / Timing Role: Medium-power NPN driver stage interfacing microcontroller GPIO to motor winding. Use Value: 4A ICM handles stall current surges; 150MHz fT ensures clean turn-on/turn-off edges. |
| LED Constant-Current Driver | Automotive Interior Lighting |
Use Scenario: Adjustable current sink for high-brightness white LED strings in signage and backlighting. IC Role / Device Role / Timing Role: Linear current-regulating transistor controlled by op-amp feedback loop. Use Value: Tight hFE spread (100–300) enables accurate current scaling with minimal trim components. | Use Scenario: Dimmable map light and courtesy lamp driver in passenger compartment modules. IC Role / Device Role / Timing Role: Switching element in PWM-controlled current source for LED brightness regulation. Use Value: –55°C to +150°C rating ensures reliable operation across vehicle cabin temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD44H11T4 | Higher VCEO (80V), lower hFE (15–120), TO-252 package | Suitable for higher-voltage flyback snubbers but requires larger PCB area | Select when >40V breakdown margin is required and thermal pad area exceeds 100mm² |
| ZTX653 | Lower IC (0.5A), smaller SOT89 package, no collector tab | Used in space-constrained signal-level amplifiers, not power switching | Choose only for low-current (<500mA), low-power (<1W) applications where SOT223 footprint is unavailable |
Compared with MJD44H11T4 and ZTX653, FZT489QTA offers optimal balance of 30V/1A rating, SOT223 thermal performance, and cost-effective manufacturability for industrial and automotive interior loads.
Availability
FZT489QTA is available at Aetrix Electronics and suitable for industrial power supplies, brushed DC motor drivers, and LED constant-current drivers requiring stable component supply and long-term production continuity.
Supply support for FZT489QTA 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
FZT489QTA belongs to Diodes' general-purpose bipolar transistor product line, engineered for high-reliability industrial and automotive interior applications where thermal stability, ESD robustness, and RoHS/Green compliance are mandatory.
FAQ
What is the maximum continuous collector current for FZT489QTA?
The maximum continuous collector current is 1 A at TA = +25°C with proper PCB thermal management (50mm × 50mm 2oz copper). Derating applies above +25°C ambient: power dissipation drops linearly to zero at +150°C case temperature, per the published derating curve in DS33134 Rev. 6–2.
Is FZT489QTA pin-compatible with FZT489TA?
Yes - FZT489QTA and FZT489TA share identical SOT223 (Type DN) mechanical outline, pin assignment (E-B-C-Tab), and electrical specifications. The "Q" suffix denotes automotive qualification (AEC-Q101), while "TA" indicates commercial-grade; both use the same die and packaging process.
Can FZT489QTA replace a BC337 in existing designs?
No - BC337 is an SOT23 device rated for 0.5A IC and 45V VCEO, with no thermal pad. FZT489QTA's SOT223 footprint, 1A rating, and collector-tab thermal path require PCB layout revision and increased base drive capability (100mA vs. ~5mA for BC337), making it non-drop-in.
Does FZT489QTA require a heatsink in typical applications?
Not necessarily - with a minimum 50mm² 2oz copper pad connected to the collector tab, FZT489QTA dissipates 3.0W at +25°C ambient without external heatsink. For 1A continuous operation at >60°C ambient, a small copper pour or thermal via array is recommended to maintain TJ < 150°C.
FZT489QTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 200mA, 2A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 2V
- Power - Max:
- 3 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT489QTA FAQ
1.How can I place an order for FZT489QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT489QTA 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 FZT489QTA reliable?
The price and inventory of FZT489QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT489QTA is usually 5 days.
3.What payment methods are accepted for FZT489QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT489QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT489QTA?
FZT489QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT489QTA 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 FZT489QTA?
For technical support, including FZT489QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT489QTA requirements.
6.How does Aetrix verify that FZT489QTA is sourced from the original manufacturer or authorized distributors?
All FZT489QTA 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 FZT489QTA meets industry standards.
7.What is the process for return or replacement of FZT489QTA?
All FZT489QTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT489QTA, 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 FZT489QTA part is unused and in its original packaging.
Return procedure for FZT489QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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