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Diodes Incorporated FZT603TC
- Part No.:
- FZT603TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT603TC.pdf
- Description:
- TRANS NPN DARL 80V 2A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,052
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Product details
Overview
FZT603TC from Diodes Incorporated is an 80V NPN Darlington transistor in SOT223 package, designed for high-current switching applications requiring robust voltage blocking and high DC current gain. It delivers 2A continuous collector current, supports up to 6A peak pulse current, exhibits BVCEO > 80V and BVCBO > 100V, and is qualified to AEC-Q standards for automotive-grade reliability - used in motor drive stages and industrial power control circuits.
For engineers reviewing the FZT603TC datasheet, FZT603TC pinout, FZT603TC application, or FZT603TC equivalent, key selection criteria include its Darlington configuration enabling high hFE (up to 100,000 at low IC), VCE(sat) ≤ 0.99V at 2A, thermal resistance RθJL = 12.9°C/W, and JEDEC-compliant SOT223 mechanical footprint with lead-free, halogen-free "Green" construction.
Technical Context
The FZT603TC implements a monolithic NPN Darlington pair structure, delivering high current amplification with integrated base-emitter shunt resistor omitted - requiring external base drive control. Its breakdown characteristics (BVCEO = 80V, BVCBO = 100V) support operation in 48V industrial bus and 24V automotive subsystems.
Thermal performance is defined by RθJL = 12.9°C/W (junction-to-lead), enabling direct heat conduction through the collector tab when mounted on copper pads. Electrical behavior includes fT = 150MHz, VBE(sat) = 1.95V at 2A, and ESD HBM rating of 2kV - confirming suitability for moderate-speed switching with robust latch-up immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 80 V - Maximum sustainable collector-emitter voltage before avalanche, enabling use in 48V rail switching. |
| IC (continuous) | 2 A - Rated DC collector current; supports sustained load switching without derating at TA ≤ 70°C with 50mm × 50mm 2oz Cu. |
| hFE | 3,000–100,000 - Wide DC current gain range across 50mA–6A, allowing flexible base drive design for varying load conditions. |
| VCE(sat) | 0.99 V @ 2A/20mA - Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle applications. |
| RθJL | 12.9 °C/W - Junction-to-lead thermal resistance enables efficient heat transfer via collector tab to PCB copper, critical for power dissipation management. |
| fT | 150 MHz - Transition frequency confirms usable bandwidth for PWM frequencies up to ~10–20 MHz in linear or switching modes. |
| ESD HBM | 2,000 V - Human Body Model rating ensures handling robustness during assembly and board-level integration. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-terminal plastic molded case with exposed collector tab for thermal conduction. Molded compound meets UL 94V-0; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Low-impedance output node; connects to ground or return path; requires low-inductance routing for fast turn-off. |
| Base (B) | Control input | Drives Darlington pair; requires current-limited source (e.g., 20mA max for 2A IC) due to high hFE. |
| Collector (C) | Power output terminal | Exposed metal tab - primary thermal path; must be soldered to ≥25 mm² 2oz copper for rated power dissipation. |
| Collector Tab (C) | Thermal & electrical node | Electrically identical to Collector pin; provides mechanical mounting and thermal interface - not isolated. |
Key Features
| Feature | Design Value |
|---|---|
| Darlington architecture | Delivers hFE ≥ 3,000 at 50mA and ≥ 2,000 at 2A - reduces required base drive current by >10× vs. single NPN. |
| High-voltage isolation | BVCBO > 100V and BVCEO > 80V - supports direct connection to unregulated 48V supplies without external snubbing. |
| Automotive-qualified reliability | Qualified to AEC-Q200 stress test standards - validated for temperature cycling, humidity, and mechanical shock in vehicle environments. |
| Green manufacturing | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); RoHS 3 compliant - meets EU and global environmental compliance mandates. |
Applications
| Industrial Motor Control | Automotive HVAC Blower Driver |
|---|---|
Use Scenario: Driving brushed DC fans and small PMDC motors in PLC I/O modules and factory automation controllers. IC Role / Device Role / Timing Role: High-side or low-side switching element in H-bridge or half-bridge configurations, handling 1–2A stall currents. Use Value: Low VCE(sat) (≤0.99V) and high hFE reduce gate driver complexity and conduction losses, extending thermal margin under continuous duty. | Use Scenario: Controlling cabin blower motors in 12V/24V automotive HVAC systems with variable speed requirements. IC Role / Device Role / Timing Role: Final-stage power switch interfacing with PWM microcontroller outputs and flyback protection diodes. Use Value: AEC-Q qualification and 150°C TJ(max) ensure stable operation across under-hood temperature extremes (-40°C to +125°C ambient). |
| LED Constant-Current Driver | Industrial Solenoid Actuator Interface |
Use Scenario: Regulating current through high-brightness LED strings in signage and machine vision lighting. IC Role / Device Role / Timing Role: Linear or PWM-controlled current sink in constant-current feedback loops with op-amp sensing. Use Value: Tight VBE(sat) tolerance (1.70–1.95V) and stable hFE enable accurate current mirroring without trimming resistors. | Use Scenario: Energizing 24V solenoid valves in pneumatic control panels and process instrumentation. IC Role / Device Role / Timing Role: Inductive load switch with integrated freewheeling path via external diode; handles 2A inrush and 1.2A hold current. Use Value: 6A peak pulse rating accommodates solenoid inrush transients; RθJL = 12.9°C/W allows compact heatsinking on control board copper. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX851 | Lower VCEO (60V), lower hFE (1,000–8,000), TO-92 package | Not suitable for 48V systems; limited thermal capability (RθJA > 200°C/W) | Select only for low-voltage, low-power signal switching where SOT223 footprint is unnecessary. |
| MJD122 | Same VCEO (80V), higher IC (8A), TO-252 package, no AEC-Q qualification | Larger footprint; lacks automotive reliability validation; higher VCE(sat) (1.5V @ 4A) | Prefer for higher-current industrial loads where space permits and automotive qualification is not required. |
Compared with ZTX851 and MJD122, the FZT603TC uniquely balances 80V blocking, 2A continuous rating, AEC-Q qualification, and SOT223 thermal efficiency - making it optimal for space-constrained, reliability-critical 24–48V switching where both performance and compliance matter.
Availability
FZT603TC is available at Aetrix Electronics and suitable for industrial motor control, automotive HVAC systems, LED constant-current drivers, and solenoid actuator interfaces requiring stable component supply and long-term production continuity.
Supply support for FZT603TC 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 power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.
The FZT603TC belongs to Diodes' high-voltage Darlington transistor product line, engineered specifically for robust, thermally efficient switching in 24–48V industrial and automotive power stages where high hFE, low saturation voltage, and AEC-Q compliance are mandatory.
FAQ
What is the maximum junction temperature for the FZT603TC?
The FZT603TC has a specified operating junction temperature range of –55°C to +150°C. This maximum rating is validated under steady-state conditions with appropriate PCB copper area (e.g., 50mm × 50mm 2oz Cu) and still-air environment. Derating begins above +70°C ambient per Figure 5 in DS33146 Rev. 6–2.
Does the FZT603TC include an internal base-emitter resistor?
No, the FZT603TC is a standard Darlington transistor without integrated base-emitter resistors. External base current must be actively controlled - typically via series resistor or current-source driver - to achieve desired IC and avoid thermal runaway under high-gain conditions.
Can the FZT603TC replace the FZT603Q in non-automotive designs?
Yes - the FZT603TC shares identical electrical and thermal specifications with the automotive-qualified FZT603Q, differing only in qualification documentation and traceability. Both use the same die and SOT223 package; the TC variant is intended for industrial/commercial applications where AEC-Q is not mandated.
What is the recommended minimum pad layout for thermal performance?
Diodes specifies a minimum suggested pad layout for SOT223 (Type DN) with C = 2.30mm, C1 = 6.40mm, X = 1.20mm, X1 = 3.30mm, Y = 1.60mm, Y1 = 1.60mm, and Y2 = 8.00mm (all in mm). For full 3.0W dissipation, a 50mm × 50mm 2oz copper area is required per Note 5 in the Absolute Maximum Ratings table.
FZT603TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 2 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT603TC FAQ
1.How can I place an order for FZT603TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT603TC 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 FZT603TC reliable?
The price and inventory of FZT603TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT603TC is usually 5 days.
3.What payment methods are accepted for FZT603TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT603TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT603TC?
FZT603TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT603TC 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 FZT603TC?
For technical support, including FZT603TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT603TC requirements.
6.How does Aetrix verify that FZT603TC is sourced from the original manufacturer or authorized distributors?
All FZT603TC 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 FZT603TC meets industry standards.
7.What is the process for return or replacement of FZT603TC?
All FZT603TC units undergo pre-shipment inspection (PSI). If there is an issue with FZT603TC, 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 FZT603TC part is unused and in its original packaging.
Return procedure for FZT603TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FZT603TC Tags
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Diodes Incorporated
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