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Diodes Incorporated FZT705TA
- Part No.:
- FZT705TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT705TA.pdf
- Description:
- TRANS PNP DARL 120V 2A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:18,078
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Product details
Overview
FZT705TA from Diodes Incorporated is a 120V PNP Darlington transistor in SOT223 package, designed for high-voltage switching with -2A continuous collector current, >2k DC current gain at -2A, and -140V collector-base breakdown voltage. It drives lamps, relays, and solenoids in industrial control and power interface circuits.
For engineers reviewing the FZT705TA datasheet, FZT705TA pinout, FZT705TA application, or FZT705TA equivalent, key selection criteria include verified VCEO = -120V, hFE ≥ 2000 @ -2A, VCE(sat) ≤ -1.3V @ -2A/-2mA, thermal resistance RθJA = 41.7°C/W (50mm × 50mm 2oz Cu), and RoHS-compliant matte tin plating.
Technical Context
This PNP Darlington configuration integrates two cascaded transistors to deliver high current gain while maintaining robust voltage blocking. Its -120V VCEO and -140V VCBO ratings support operation in high-side switch topologies where emitter is tied to positive rail.
The device exhibits low saturation voltage (-1.3V max @ -2A/-2mA) and fast switching performance (ton = 0.6µs, toff = 0.8µs), enabling efficient drive of inductive loads without excessive power loss or flyback stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -120V - Enables safe operation in 100V-class DC power rails with margin |
| hFE | ≥2000 @ -2A - Delivers high current amplification with minimal base drive |
| VCE(sat) | -1.3V max @ -2A/-2mA - Limits conduction loss to ≤2.6W at full load |
| PD | 3W (50mm×50mm 2oz Cu) - Supports thermally demanding PCB layouts |
| RθJA | 41.7°C/W - Predictable junction temperature rise under steady-state conditions |
| fT | 160MHz - Ensures adequate bandwidth for fast-switching control signals |
| ESD HBM | 2000V - Provides handling robustness during assembly and test |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin outline with exposed collector tab for thermal dissipation. Molded green compound, UL 94V-0 rated, 0.112g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | Input terminal for current source | Connected to positive supply rail in high-side switch configurations |
| Pin 2 (Base) | Control input | Receives low-current drive signal to enable high-current output |
| Pin 3 (Collector) | Output terminal / heat sink pad | Electrically and thermally connected to PCB copper pour for power dissipation |
| Pin 4 (Collector Tab) | Primary thermal path | Exposed metal tab soldered directly to large copper area for RθJL = 12.9°C/W |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | VCBO > -140V ensures reliability in transient-prone 100V systems |
| High-current capability | -2A continuous rating supports direct drive of 24V/12V solenoids and relay coils |
| Low-saturation design | VCE(sat) ≤ -1.3V minimizes I²R losses and self-heating at full load |
| Lead-free & green compliance | RoHS 3 compliant, halogen- and antimony-free per <900ppm Br/Cl limits |
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 Darlington switch controlling lamp current path to ground. Use Value: Delivers -2A peak current with <1.3V drop, reducing thermal load on PCB and extending lamp life via stable current regulation. | Use Scenario: Driving 12–48V DC coil relays in programmable logic controllers and motor starters. IC Role / Device Role / Timing Role: High-gain switching element providing sufficient base current amplification for low-drive microcontrollers. Use Value: hFE ≥ 2000 at -2A enables TTL/CMOS-level base drive while sustaining relay hold current reliably. |
| Solenoid Interface | Industrial Power Sequencing |
Use Scenario: Controlling pneumatic/hydraulic solenoid valves in factory automation and fluid control systems. IC Role / Device Role / Timing Role: High-voltage, high-current switch managing inductive load turn-on/turn-off with integrated flyback protection compatibility. Use Value: -120V VCEO withstands back-EMF spikes up to -100V, reducing need for external clamping diodes. | Use Scenario: Enabling/disabling auxiliary power rails in embedded controllers and sensor nodes. IC Role / Device Role / Timing Role: Precision-controlled high-side switch sequencing power to downstream subsystems. Use Value: Tight VBE(on) tolerance (-1.53V to -1.7V) ensures predictable turn-on threshold across temperature and production lots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX788B | VCEO = -100V, hFE = 1000–4000 @ -1A, SOT89 package | Lower voltage rating; unsuitable for >100V bus applications | Select when board space is constrained and voltage stress remains below 90V. |
| MJD122 | VCEO = -100V, IC = -8A, TO-220 package, higher thermal mass | Requires heatsink for >2A; larger footprint and manual assembly | Prefer for high-current, non-SMT designs where thermal derating is critical. |
Compared with ZTX788B and MJD122, FZT705TA uniquely balances -120V blocking, SOT223 surface-mount compatibility, and verified 2A continuous operation without external heatsinking-making it optimal for compact, high-reliability industrial switching modules.
Availability
FZT705TA is available at Aetrix Electronics and suitable for lamp drivers, relay interfaces, solenoid actuators, and industrial power sequencing requiring stable component supply and long-term manufacturability.
Supply support for FZT705TA 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, communications, and consumer markets.
FZT705TA belongs to Diodes' high-voltage PNP Darlington transistor product line, engineered for robust, high-gain switching in space-constrained industrial control and power interface applications.
FAQ
What is the maximum continuous collector current for FZT705TA?
The FZT705TA supports -2A continuous collector current at TA = +25°C with appropriate PCB copper area (50mm × 50mm 2oz Cu). Derating applies above 25°C ambient; at 100°C, maximum continuous current drops to approximately -1.2A per thermal curves in DS33160 Rev. 5-2.
Does FZT705TA require an external flyback diode when driving inductive loads?
FZT705TA does not integrate a flyback diode. When switching relays or solenoids, an external reverse-biased diode (e.g., 1N4007) must be placed across the load to clamp inductive kickback. Its -120V VCEO rating provides margin but does not eliminate the need for proper snubbing.
How is the SOT223 collector tab electrically configured?
The SOT223 collector tab (Pin 3 and Pin 4) is internally connected to the transistor's collector terminal and serves as both electrical output and primary thermal path. It must be soldered to a dedicated PCB copper pour to achieve specified RθJA = 41.7°C/W and avoid thermal runaway under sustained load.
Is FZT705TA qualified for automotive applications?
No-FZT705TA is not AEC-Q101 qualified. Diodes offers the automotive-grade FZT705Q variant, which undergoes additional stress testing and operates across -40°C to +150°C with enhanced process controls. For automotive use, FZT705Q must be specified instead of FZT705TA.
FZT705TA 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
FZT705TA FAQ
1.How can I place an order for FZT705TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT705TA 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 FZT705TA reliable?
The price and inventory of FZT705TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT705TA is usually 5 days.
3.What payment methods are accepted for FZT705TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT705TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT705TA?
FZT705TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT705TA 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 FZT705TA?
For technical support, including FZT705TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT705TA requirements.
6.How does Aetrix verify that FZT705TA is sourced from the original manufacturer or authorized distributors?
All FZT705TA 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 FZT705TA meets industry standards.
7.What is the process for return or replacement of FZT705TA?
All FZT705TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT705TA, 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 FZT705TA part is unused and in its original packaging.
Return procedure for FZT705TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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