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Diodes Incorporated FZT603QTA
- Part No.:
- FZT603QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT603QTA.pdf
- Description:
- TRANS NPN DARL 80V 2A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:318
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Product details
Overview
FZT603QTA from Diodes Incorporated is an AEC-Q101-qualified 80V NPN Darlington transistor in SOT223 package, designed for automotive power switching applications requiring high current gain and robust voltage blocking. It delivers 2A continuous collector current, 80V VCEO, 100V VCBO, and usable hFE up to 6A - enabling reliable operation in motor drivers, body control modules, and LED lighting ballasts.
For engineers reviewing the FZT603QTA datasheet, FZT603QTA pinout, FZT603QTA application, or FZT603QTA equivalent, key selection criteria include its 2A DC current capability, 3.0W power dissipation on 50mm×50mm 2oz copper, AEC-Q101 qualification, RoHS-compliant matte tin plating, and thermal resistance of 41.7°C/W (RθJA).
Technical Context
The FZT603QTA integrates a two-stage NPN Darlington configuration with internal base-emitter resistor network optimized for low-input-drive switching. Its high hFE (3000–15,000 across 50mA–6A) enables direct microcontroller GPIO drive without external base resistors in many cases.
It features 10V VEBO, 2000V HBM ESD rating, and operates across –55°C to +150°C junction temperature range. Thermal design leverages the SOT223 lead-frame structure, with RθJL = 12.9°C/W and RθJC = 1.1°C/W (2oz copper), supporting stable performance under pulsed and steady-state loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 80 V - Supports 24V/48V automotive systems with ≥2× safety margin against transients |
| IC (continuous) | 2 A - Enables direct driving of solenoids, relays, and small motors without heatsinking |
| hFE @ 2A | 2000 min - Ensures <1 mA base drive suffices for full saturation at 2A load |
| VCE(sat) @ 2A | 0.88 V max - Limits conduction loss to ≤1.76 W at 2A, easing thermal management |
| RθJA | 41.7 °C/W - Achievable with 50mm×50mm 2oz copper pad; defines minimum PCB copper area needed |
| fT | 150 MHz - Supports fast switching in PWM dimming and commutation circuits up to ~100 kHz |
| ESD HBM | 2000 V - Meets IEC 61000-4-2 Level 3 for board-level handling in automotive assembly |
Pinout & Package
Package: SOT223 - Surface-mount plastic package with exposed collector tab for thermal and electrical connection; 0.112 g mass; UL 94V-0 rated molding compound; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side return path; requires low-inductance routing for fast turn-off |
| Base (B) | Control input | Driven by MCU GPIO or logic buffer; 1 mA sufficient for full saturation at 2A load |
| Collector (C) | High-current output | Exposed metal tab - must be soldered to large copper pour for thermal conduction and current return |
| Collector Tab (C) | Thermal & power path | Electrically identical to Collector pin; primary heat extraction path to PCB; not isolated |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTGB, TC, AC/DC life tests |
| Lead-free & halogen-free | Meets RoHS 3 and JEDEC J-STD-020 MSL-1; no bromine/chlorine/antimony restrictions in production |
| High hFE up to 6A | Enables single-stage driver architecture - eliminates need for pre-driver stage in many BCM applications |
| Low VCE(sat) at 2A | Reduces power loss and self-heating during sustained conduction, improving system efficiency |
| Robust 100V VCBO | Withstands load-dump transients up to 100V without breakdown, enhancing reliability in 24V systems |
Applications
| Automotive Body Control Module (BCM) | LED Headlamp Driver |
|---|---|
Use Scenario: Switching 12V/24V loads such as door locks, window lifts, and interior lighting in OEM BCMs. IC Role / Device Role / Timing Role: High-gain NPN Darlington switch providing low-input-drive, high-current output with integrated base biasing. Use Value: Eliminates need for discrete base-resistor networks and reduces component count while maintaining AEC-Q101 compliance. | Use Scenario: Constant-current switching for high-brightness LED arrays in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Low-saturation, thermally robust switching element in PWM-controlled LED current paths. Use Value: 0.88 V VCE(sat) minimizes power loss at 2A, reducing thermal stress on optics and improving lumen maintenance. |
| Industrial Solenoid Driver | 48V Telecom Power Sequencing |
Use Scenario: Driving 24V/48V industrial solenoids in valve control and pneumatic actuation systems. IC Role / Device Role / Timing Role: High-voltage, high-current discrete switch with fast turn-on (<0.5 µs) and controlled turn-off. Use Value: 80V VCEO and 100V VCBO withstand inductive kickback without snubbers in most 48V-rated solenoids. | Use Scenario: Controlled power-up sequencing of downstream 48V telecom subsystems (e.g., PoE injectors, line cards). IC Role / Device Role / Timing Role: Soft-start and enable switch managing inrush current into bulk capacitance banks. Use Value: 2A continuous rating supports >100W sequencing loads; RθJA = 41.7°C/W allows stable operation without forced air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSS12201LT1G | Lower VCEO (60V), lower hFE (1000 typ @ 1A), SOT-23 package | Not AEC-Q101 qualified; limited to non-automotive consumer/industrial use | Select only if 60V rating suffices and space constraints require SOT-23 footprint |
| STMicroelectronics STN83003 | Higher VCEO (100V), higher IC (3A), but larger SOT-223-4 package with separate emitter pin | Requires different PCB layout; lacks AEC-Q101 certification in standard grade | Prefer when >2A current or 100V transient margin is mandatory, and automotive qualification is not required |
Compared with NSS12201LT1G and STN83003, the FZT603QTA uniquely combines AEC-Q101 qualification, 80V/2A rating, and SOT223-3 pinout in a single-source automotive-grade solution - making it optimal for cost-sensitive, space-constrained BCM and lighting designs where qualification and thermal performance are critical.
Availability
FZT603QTA is available at Aetrix Electronics and suitable for automotive body control modules, LED headlamp drivers, industrial solenoid actuators, and 48V telecom power sequencing requiring stable component supply and full AEC-Q101 traceability.
Supply support for FZT603QTA 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, specializing in high-reliability components for automotive, industrial, and computing markets.
The FZT603QTA belongs to Diodes' Automotive-Quality Discrete Transistor product line, engineered specifically for high-voltage, high-current switching in harsh-environment vehicle systems - emphasizing AEC-Q101 compliance, thermal robustness, and long-term supply stability.
FAQ
What is the maximum safe operating temperature for FZT603QTA?
The FZT603QTA has a specified junction temperature range of –55°C to +150°C. For reliable long-term operation, junction temperature should be kept below 135°C under continuous load. With RθJA = 41.7°C/W and 3.0W max power dissipation, ambient temperature must remain ≤105°C when mounted on 50mm×50mm 2oz copper - verified per DS40771 Rev. 2-2 derating curves.
Is FZT603QTA pin-compatible with standard SOT223 NPN transistors?
No - the FZT603QTA uses a non-standard SOT223 pinout where the collector is the exposed tab and pin 3, while emitter is pin 1 and base is pin 2. Standard SOT223 NPNs (e.g., MMBT4401) assign collector to pin 1. PCB layout must follow Diodes' official SOT223 outline (DS40771 p.6) to avoid misconnection.
Does FZT603QTA require an external base resistor?
No external base resistor is required for most applications. The device's minimum hFE of 2000 at 2A ensures full saturation with ≤1 mA base current. However, a 10kΩ series resistor is recommended between MCU GPIO and base to limit peak current during fast edge transitions and improve noise immunity in automotive harness environments.
How does the FZT603QTA handle inductive load switching?
The FZT603QTA withstands inductive kickback via its 100V VCBO rating and 2000V HBM ESD protection. For solenoid or relay loads, a flyback diode (e.g., 1N4007) across the coil is still required to clamp energy and prevent secondary breakdown. Turn-off time (toff = 1.6 µs) is sufficiently fast for 100 kHz PWM, but snubber networks may be needed above 50 kHz in high-L systems.
FZT603QTA 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 - Darlington
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.13V @ 20mA, 2A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 5000 @ 500mA, 5V
- Power - Max:
- 1.2 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
FZT603QTA FAQ
1.How can I place an order for FZT603QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT603QTA 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 FZT603QTA reliable?
The price and inventory of FZT603QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT603QTA is usually 5 days.
3.What payment methods are accepted for FZT603QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT603QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT603QTA?
FZT603QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT603QTA 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 FZT603QTA?
For technical support, including FZT603QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT603QTA requirements.
6.How does Aetrix verify that FZT603QTA is sourced from the original manufacturer or authorized distributors?
All FZT603QTA 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 FZT603QTA meets industry standards.
7.What is the process for return or replacement of FZT603QTA?
All FZT603QTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT603QTA, 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 FZT603QTA part is unused and in its original packaging.
Return procedure for FZT603QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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