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Diodes Incorporated FZT605TA
- Part No.:
- FZT605TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT605TA.pdf
- Description:
- TRANS NPN DARL 120V 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:19,529
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Product details
Overview
FZT605TA from Diodes Incorporated is a 120V NPN Darlington transistor in SOT223 package, rated for 1.5A continuous collector current, with minimum DC current gain (hFE) of 2,000 at 1A, and VCE(sat) ≤ 1.5V at IC = 1A/IB = 1mA. It serves as a high-voltage, medium-current switching device in relay and solenoid driver circuits.
For engineers reviewing the FZT605TA datasheet, FZT605TA pinout, FZT605TA application, or FZT605TA equivalent, key selection criteria include its 120V VCEO, Darlington gain structure, SOT223 thermal performance (RθJA = 41.7°C/W on 50mm × 50mm 2oz copper), and automotive-qualified variants (AEC-Q101 capable).
Technical Context
The FZT605TA implements a monolithic NPN Darlington pair with integrated base-emitter resistor network absent - external base drive is required. Its high BVCEO (120V) and BVCBO (140V) enable robust operation in inductive load switching where voltage spikes exceed standard transistor ratings.
It delivers hFE ≥ 2,000 at IC = 1A, enabling low base drive current (e.g., ~1mA for 1A output), while maintaining VBE(sat) ≤ 1.8V and fT = 150MHz - supporting fast turn-on/turn-off (ton = 0.5µs, toff = 1.6µs) in pulsed control applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 120 V - Withstands 120V collector-emitter voltage before breakdown; suitable for 24–48V industrial control rails with flyback margin. |
| IC (cont.) | 1.5 A - Continuous collector current rating; supports solenoid loads up to ~30W at 24V with adequate heatsinking. |
| hFE (min) | 2,000 @ IC = 1A - Enables microcontroller GPIO-level base drive (e.g., 3.3V/5V logic with ~1kΩ base resistor). |
| VCE(sat) | ≤1.5 V @ IC = 1A/IB = 1mA - Limits conduction loss to ≤1.5W at full load; critical for thermal management in SOT223. |
| RθJA | 41.7 °C/W - Junction-to-ambient thermal resistance on 50mm × 50mm 2oz copper; defines max ambient temperature for 1.5A operation. |
| fT | 150 MHz - Current gain-bandwidth product; ensures usable switching speed despite Darlington topology. |
| ESD HBM | 4,000 V - Human Body Model rating; provides robustness against handling-induced static discharge in assembly environments. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin outline with collector-connected tab (pin 3). Molded green compound, UL 94V-0 rated, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | Emitting terminal of Darlington pair | Connected to load return path; carries full load current; electrically isolated from tab. |
| Pin 2 (Base) | Control input for Darlington pair | Drives both internal transistors; requires external current-limiting resistor for logic-level interfacing. |
| Pin 3 (Collector / Tab) | Main power input and thermal interface | Collector connection tied to exposed metal tab; must be electrically connected to PCB copper pour for heat dissipation and EMI shielding. |
| Pin 4 (Emitter – redundant) | Second emitter connection | Internally bonded to Pin 1; used for mechanical stability and enhanced current sharing; must be connected to same net as Pin 1. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | VCEO = 120V and VCBO = 140V support 48V systems with >2× safety margin against inductive kickback. |
| Darlington DC gain | hFE ≥ 2,000 at 1A enables direct drive from low-power MCUs without additional pre-driver stages. |
| SOT223 thermal performance | RθJL = 12.9°C/W (junction-to-lead) allows >2W dissipation with minimal PCB copper when tab is soldered to large plane. |
| Automotive readiness | AEC-Q101 qualification path available; manufactured in IATF 16949 facilities with PPAP capability for automotive solenoid modules. |
| Green compliance | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); RoHS 3 compliant with lead-free matte tin finish. |
Applications
| Lamp Driver Module | Industrial Relay Interface |
|---|---|
Use Scenario: Driving 24V/1A incandescent or LED indicator lamps in panel-mounted HMI units. IC Role / Device Role / Timing Role: High-side switch controlling lamp anode with PWM dimming capability. Use Value: Low VCE(sat) minimizes lamp voltage drop; high hFE eliminates need for buffer stage, reducing BOM count. |
Use Scenario: Controlling 24VDC coil relays in PLC I/O modules with 10ms switching cycles. IC Role / Device Role / Timing Role: Final-stage power switch interfacing MCU GPIO to relay coil. Use Value: 120V VCEO safely clamps 200+V flyback spikes; 1.6µs turn-off time prevents contact chatter during rapid cycling. |
| Solenoid Actuator Control | Automotive Door Lock Driver |
Use Scenario: Energizing 12V/1.2A linear solenoids in vending machine dispensers and HVAC dampers. IC Role / Device Role / Timing Role: Medium-power DC switch activated by microcontroller with flyback diode protection. Use Value: 1.5A IC rating matches solenoid hold current; SOT223 tab enables direct mounting to metal chassis for thermal relief. |
Use Scenario: Driving door lock/unlock solenoids in body control modules (BCM) under ISO 16750-2 load dump conditions. IC Role / Device Role / Timing Role: AEC-Q101-qualified power switch in 12V automotive subsystems. Use Value: 4kV ESD HBM withstands assembly handling; green material compliance meets OEM environmental requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX605 | VCEO = 100V (vs. 120V); hFE min = 1,000 @ 1A; RθJA = 50°C/W (SOT223) | Lower voltage margin limits use in 48V systems or high-spike relay coils. | Select ZTX605 only if system max VCE stays below 80V and thermal headroom permits higher RθJA. |
| MJD122G | VCEO = 100V; IC = 3A; TO-220 package; hFE min = 1,000 @ 1A | Requires through-hole mounting and larger heatsink; unsuitable for space-constrained SMT designs. | Choose MJD122G only when >2A peak current or superior thermal mass outweighs SMT compatibility needs. |
Compared with ZTX605 and MJD122G, the FZT605TA uniquely balances 120V blocking, SMT compatibility, and Darlington gain in a thermally optimized SOT223 - making it optimal for compact 24–48V industrial and automotive switching where board area and voltage margin are critical.
Availability
FZT605TA is available at Aetrix Electronics and suitable for lamp drivers, relay interfaces, solenoid actuators, and automotive door lock modules requiring stable component supply and long-term manufacturability.
Supply support for FZT605TA 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.
The FZT605TA belongs to Diodes' high-voltage bipolar transistor portfolio, engineered specifically for ruggedized industrial and automotive switching applications demanding high gain, voltage margin, and thermal efficiency in compact SMT packages.
FAQ
What is the maximum safe operating temperature for FZT605TA at 1.5A continuous current?
The FZT605TA has a junction temperature limit of +150°C and RθJA = 41.7°C/W on 50mm × 50mm 2oz copper. At 1.5A with VCE(sat) ≈ 1.3V, power dissipation is ~1.95W. This yields a max ambient temperature of ~70°C before reaching TJ = 150°C - confirming suitability for enclosed industrial enclosures without forced air.
Can FZT605TA replace a standard NPN transistor like BC337 in a relay driver?
Yes - but only if the relay coil voltage exceeds 30V or requires >500mA. The FZT605TA's Darlington structure gives higher hFE and VCEO, but adds ~0.7V higher VBE(sat) and slower switching than BC337. Use it where voltage margin or gain is critical, not for low-voltage, high-speed switching.
Is the exposed tab on the SOT223 package electrically connected, and how should it be handled?
Yes - the tab is internally connected to the collector (Pin 3). It must be soldered to a PCB copper pour for thermal conduction and electrical grounding. Do not isolate it; floating or unconnected tabs cause thermal runaway and premature failure. Minimum recommended pad layout is provided in Diodes' package outline DS33147 Rev. 8-2, page 6.
Does FZT605TA require a base resistor, and what value is recommended for 3.3V MCU drive?
Yes - external base current limiting is mandatory. For 3.3V GPIO driving 1A collector current with hFE = 2,000, target IB = 0.5mA. Using VBE(sat) ≈ 1.7V, RB = (3.3V − 1.7V)/0.5mA = 3.2kΩ - a standard 3.3kΩ resistor ensures reliable saturation while preventing overdrive and excessive MCU loading.
FZT605TA 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):
- 1.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 120 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 1mA, 1A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 2000 @ 1A, 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
FZT605TA FAQ
1.How can I place an order for FZT605TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT605TA 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 FZT605TA reliable?
The price and inventory of FZT605TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT605TA is usually 5 days.
3.What payment methods are accepted for FZT605TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT605TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT605TA?
FZT605TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT605TA 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 FZT605TA?
For technical support, including FZT605TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT605TA requirements.
6.How does Aetrix verify that FZT605TA is sourced from the original manufacturer or authorized distributors?
All FZT605TA 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 FZT605TA meets industry standards.
7.What is the process for return or replacement of FZT605TA?
All FZT605TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT605TA, 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 FZT605TA part is unused and in its original packaging.
Return procedure for FZT605TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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