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Diodes Incorporated FZT705TC
- Part No.:
- FZT705TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT705TC.pdf
- Description:
- TRANS PNP DARL 120V 2A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
FZT705TC from Diodes Incorporated is a 120V PNP Darlington transistor in SOT223 package, designed for high-voltage switching with -120V VCEO, -2A continuous collector current, and minimum hFE of 2,000 at -2A. It drives relays, solenoids, and lamps in industrial control and power interface circuits.
For engineers reviewing the FZT705TC datasheet, FZT705TC pinout, FZT705TC application, or FZT705TC equivalent, key selection criteria include breakdown voltage margin (-140V VCBO), thermal resistance (12.9°C/W junction-to-lead), saturation performance (-1.3V VCE(sat) @ -2A), and RoHS-compliant green packaging.
Technical Context
This Darlington pair integrates two PNP transistors to deliver high DC current gain while maintaining robust high-voltage blocking capability. Its structure enables low base drive requirements for heavy loads, with verified operation up to -120V VCEO and -140V VCBO.
Thermal design is supported by a measured RθJL of 12.9°C/W and multiple RθJA ratings (41.7–104°C/W) depending on PCB copper area. ESD robustness includes 2kV HBM and ≥200V MM ratings per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -120 V: Sustains 120V reverse collector-emitter voltage before breakdown, enabling use in 100V-class industrial power rails. |
| IC (cont.) | -2 A: Supports continuous load current up to 2A, sufficient for driving 24V/12V relays and solenoids directly. |
| hFE | 2k min @ -2A: Delivers high current gain at full rated current, reducing required base drive to ~2mA for full conduction. |
| VCE(sat) | -1.3 V max @ -2A: Limits conduction loss to ≤2.6W at full current, easing thermal management on standard SOT223 layouts. |
| RθJL | 12.9 °C/W: Enables direct thermal coupling to PCB copper pour or heatsink via collector lead, critical for sustained high-current operation. |
| ESD HBM | 2,000 V: Provides built-in handling robustness during assembly without requiring additional protection circuitry. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-terminal plastic molded case with exposed collector tab for thermal and electrical connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current source terminal | Connected to positive rail in high-side switch configuration; requires stable bias reference. |
| Base (B) | Control input | Receives low-current drive signal; logic-level compatible with 3.3V/5V microcontrollers via current-limiting resistor. |
| Collector (C) | Main output terminal | Exposed metal tab-electrically and thermally connected to PCB copper; must be isolated from other potentials if not grounded. |
| Collector Tab (C) | Thermal & electrical path | Primary heat dissipation route; soldered directly to large copper area or heatsink for 1.2W–3W power handling. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | VCBO > -140V ensures safe operation in 100–120V DC systems with transient margin. |
| Darlington gain architecture | hFE ≥ 2,000 at -2A reduces base drive burden and simplifies driver-stage design. |
| Thermally optimized lead frame | RθJL = 12.9°C/W supports >1.5W continuous dissipation with minimal external heatsinking. |
| Green RoHS-compliant construction | Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) meets automotive and industrial environmental mandates. |
Applications
| Lamp Driver | Relay Driver |
|---|---|
Use Scenario: Switching 12–24V incandescent or LED indicator lamps in industrial HMIs and panel controls. IC Role / Device Role / Timing Role: High-side PNP switch controlling lamp current path to ground. Use Value: -120V VCEO prevents breakdown during inductive kickback from lamp filaments; -1.3V VCE(sat) minimizes self-heating at 1–2A loads. | Use Scenario: Driving 24VDC electromagnetic relays in PLC I/O modules and motor starters. IC Role / Device Role / Timing Role: Low-base-drive Darlington switch delivering 2A coil current with <2mA base input. Use Value: hFE ≥ 2k eliminates need for pre-driver stages; RθJL = 12.9°C/W sustains relay cycling without thermal derating. |
| Solenoid Interface | Industrial Power Sequencing |
Use Scenario: Controlling 24V/48V linear solenoids in valve actuators and pneumatic systems. IC Role / Device Role / Timing Role: High-current, high-voltage switch managing inductive load turn-on/off transitions. Use Value: -140V VCBO withstands flyback spikes exceeding 100V; fast 0.6µs ton/0.8µs toff supports PWM-based position control. | Use Scenario: Enabling/disabling auxiliary power rails in programmable logic controllers and embedded controllers. IC Role / Device Role / Timing Role: Controlled high-side switch for sequencing 12–48V subsystems during startup/shutdown. Use Value: Lead-free, halogen-free construction satisfies IPC-1752A reporting; -55°C to +150°C operating range supports extended temperature deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX951 | VCEO = -100V, hFE = 1k min @ -1A, SOT89 package | Lower voltage rating limits use in >100V systems; smaller package reduces thermal capacity | Select when board space is constrained and voltage stress remains below 80V. |
| MJD127 | VCEO = -100V, IC = -2A, TO-220 package, no RoHS green compliance | Larger footprint and leaded finish incompatible with fine-pitch automated assembly | Choose only for legacy through-hole designs where thermal mass outweighs SMT advantages. |
Compared with ZTX951 and MJD127, FZT705TC uniquely combines -120V blocking, SOT223 surface-mount compatibility, 12.9°C/W thermal resistance, and halogen-free RoHS compliance-making it optimal for modern industrial control boards requiring reliability, density, and regulatory alignment.
Availability
FZT705TC is available at Aetrix Electronics and suitable for lamp drivers, relay interfaces, solenoid actuators, and industrial power sequencing requiring stable component supply across long-lifecycle production programs.
Supply support for FZT705TC 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 the Americas.
FZT705TC belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for ruggedized industrial switching applications demanding high gain, high breakdown voltage, and thermally efficient SMT packaging.
FAQ
What is the maximum safe operating voltage for FZT705TC in continuous DC applications?
The absolute maximum collector-emitter voltage (VCEO) is -120V, and collector-base voltage (VCBO) is -140V. For reliable long-term operation, design should maintain ≤80% of VCEO (i.e., ≤-96V) under worst-case transients and temperature extremes, per Diodes' application guidance in DS33160 Rev. 5-2.
Can FZT705TC replace a standard PNP BJT in existing designs without circuit modification?
No-FZT705TC is a Darlington pair with significantly higher hFE and VBE(sat) (~-1.67V) than single BJTs. Base resistor values must be increased to limit base current, and flyback protection must account for slower turn-off (0.8µs) and higher stored charge. Layout review for thermal pad connection is also mandatory.
Does FZT705TC require a heatsink in typical 2A switching applications?
Not necessarily: with RθJL = 12.9°C/W and PD = 2.6W at -2A, junction temperature rise is ~33.5°C above lead temperature. A 25mm² 2oz copper pour typically holds lead temperature within 40°C of ambient, keeping TJ < 110°C-within spec. Larger heatsinks are needed only for >50% duty cycle or >70°C ambient.
Is the FZT705TC marking "FZT705" sufficient for traceability and authenticity verification?
Yes-the top-marking "FZT705" matches Diodes' official SOT223 (Type DN) marking specification. Authentic units also display a YWW date code (e.g., "242" for week 2024) adjacent to the part number, and exhibit matte tin-plated leads per MIL-STD-202. Counterfeit detection requires cross-checking package dimensions and thermal resistance measurements.
FZT705TC 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:
- PNP - Darlington
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 120 V
- Vce Saturation (Max) @ Ib, Ic:
- 2.5V @ 2mA, 2A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 3000 @ 1A, 5V
- Power - Max:
- 2 W
- Frequency - Transition:
- 160MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT705TC FAQ
1.How can I place an order for FZT705TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT705TC 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 FZT705TC reliable?
The price and inventory of FZT705TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT705TC is usually 5 days.
3.What payment methods are accepted for FZT705TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT705TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT705TC?
FZT705TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT705TC 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 FZT705TC?
For technical support, including FZT705TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT705TC requirements.
6.How does Aetrix verify that FZT705TC is sourced from the original manufacturer or authorized distributors?
All FZT705TC 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 FZT705TC meets industry standards.
7.What is the process for return or replacement of FZT705TC?
All FZT705TC units undergo pre-shipment inspection (PSI). If there is an issue with FZT705TC, 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 FZT705TC part is unused and in its original packaging.
Return procedure for FZT705TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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