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Diodes Incorporated FZT705QTA
- Part No.:
- FZT705QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT705QTA.pdf
- Description:
- TRANS PNP 120V 2A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,217
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Product details
Overview
FZT705QTA from Diodes Incorporated is a 120V PNP Darlington transistor in SOT223 package, designed for high-gain switching in automotive lamp, relay, and solenoid driver circuits. It delivers -2A continuous collector current, >2,000 hFE at -2A, -120V VCEO, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the FZT705QTA datasheet, FZT705QTA pinout, FZT705QTA application, or FZT705QTA equivalent, this page provides verified electrical specs, thermal derating data, SOT223 terminal mapping, automotive compliance evidence, and real-world driver circuit context - all critical for high-reliability discrete selection.
Technical Context
This Darlington pair integrates two PNP BJTs in cascade to achieve high DC current gain (hFE ≥ 2,000 @ -2A) while maintaining robust voltage blocking (-120V VCEO, -140V VCBO). Its low saturation voltage (-1.3V @ -1A/-1mA) enables efficient power switching with minimal conduction loss.
The device operates across -55°C to +150°C, supports PPAP documentation, and is manufactured in IATF16949-certified facilities. Thermal resistance to ambient is 41.7°C/W on 50mm × 50mm 2oz copper, enabling stable operation in thermally constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -120 V - Withstands 120V reverse collector-emitter voltage before breakdown, suitable for 24V automotive systems with load dump transients. |
| IC (cont.) | -2 A - Supports continuous 2A load current for driving high-power relays or incandescent lamps without forced cooling. |
| hFE | ≥2,000 @ -2A - Enables low-base-drive-current control (e.g., -2mA base for -2A collector), reducing MCU GPIO loading. |
| VCE(sat) | -2.5 V @ -2A/-2mA - Limits conduction power loss to ≤5W at full load, critical for thermal management in sealed enclosures. |
| RθJA | 41.7 °C/W - Requires ≥50mm × 50mm 2oz copper pad for safe 3W dissipation at +25°C ambient. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronics, including temperature cycling, HTRB, and ESD (2kV HBM). |
Pinout & Package
Package: SOT223 - Surface-mount plastic package with exposed collector tab for thermal conduction and mechanical anchoring. Dimensions: 6.50 × 3.50 × 1.60 mm (L × W × H); weight ≈ 0.112 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal | Connected to positive rail in high-side switch configuration; must handle full load current and withstand reverse voltage. |
| 2 (Base) | Control input | Receives low-current drive signal; requires current-limiting resistor to prevent overdrive and ensure reliable Darlington turn-on. |
| 3 (Collector) | Power output / heat sink node | Electrically and thermally connected to PCB copper pour; serves as primary thermal path and common return for load current. |
| 4 (Tab / Collector) | Collector extension | Exposed metal tab is electrically tied to Pin 3; must be soldered to large copper area for thermal performance and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | -120V VCEO rating ensures compatibility with 24V commercial vehicle systems and transient-tolerant lamp drivers. |
| Automotive qualification | AEC-Q101 qualified, PPAP-capable, and built in IATF16949-certified facilities - meets Tier-1 supplier sourcing requirements. |
| Green packaging | Halogen- and antimony-free, RoHS-compliant (EU 2015/863), with UL 94V-0 flammability rating for safety-critical modules. |
| Thermal robustness | RθJL = 12.9°C/W enables direct heat transfer from junction to solder point, supporting compact board layouts in engine control units. |
Applications
| Lamp Driver | Relay Driver |
|---|---|
Use Scenario: Switching 12V/24V halogen or LED headlamp circuits in body control modules. IC Role / Device Role / Timing Role: High-side PNP Darlington switch controlling lamp current path to ground. Use Value: -2A rating handles peak inrush of tungsten filaments; -120V rating survives ISO 7637-2 pulse 5a load dump events. | Use Scenario: Driving 12V/24V automotive relays for HVAC, lighting, or power distribution. IC Role / Device Role / Timing Role: Low-base-drive interface between microcontroller GPIO and relay coil. Use Value: hFE ≥ 2,000 allows <2mA base current to fully saturate -2A relay coils, minimizing MCU port loading. |
| Solenoid Driver | Engine Control Actuator |
Use Scenario: Controlling fuel injector solenoids or transmission shift solenoids in powertrain modules. IC Role / Device Role / Timing Role: High-current, fast-switching driver with controlled turn-on/off timing. Use Value: tON/tOFF ≤ 0.6/0.8 µs enables precise PWM control; -12V VEBO prevents base-emitter breakdown during inductive kickback. | Use Scenario: Managing throttle valve actuators or turbocharger vanes in engine control units. IC Role / Device Role / Timing Role: Robust discrete switch interfacing MCU outputs to high-power actuator loads. Use Value: -55°C to +150°C operating range matches under-hood thermal profiles; AEC-Q101 ensures long-term reliability. |
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 = 1,000–4,000 @ -1A, SOT89 package | Lower voltage rating limits use in 24V load-dump environments; smaller thermal mass reduces power handling. | Select only for 12V-only systems with lower transient immunity requirements. |
| MJD127 | VCEO = -100V, IC = -2A, TO-220 package, no AEC-Q101 qualification | Larger footprint and no automotive qualification; lacks PPAP support and IATF16949 traceability. | Acceptable for industrial non-automotive solenoid drivers where qualification is not mandated. |
Compared with ZTX951 and MJD127, FZT705QTA uniquely combines -120V blocking, AEC-Q101 qualification, SOT223 surface-mount compatibility, and ≥2,000 hFE at full -2A load - making it the only option qualified for production automotive power switching where space, reliability, and transient resilience are jointly constrained.
Availability
FZT705QTA is available at Aetrix Electronics and suitable for automotive lamp drivers, relay interfaces, solenoid controls, and engine actuator circuits requiring stable component supply and full AEC-Q101 compliance.
Supply support for FZT705QTA 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 FZT705QTA belongs to Diodes' AEC-Q101-qualified bipolar transistor product line, engineered specifically for high-voltage, high-gain switching in automotive power control modules.
FAQ
What is the maximum allowable junction temperature for FZT705QTA?
The absolute maximum junction temperature is +150°C, with continuous operation rated from -55°C to +150°C. Derating begins above +25°C ambient per the RθJA value - for example, at +85°C ambient, maximum power dissipation drops to ~1.6W on 50mm × 50mm 2oz copper.
Is FZT705QTA pin-compatible with standard SOT223 PNP transistors?
No - FZT705QTA uses a specific SOT223 pinout where Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector, and the Tab = Collector. This differs from some SOT223 NPN devices and non-Darlington PNP variants, requiring layout verification before substitution.
Does FZT705QTA require a base resistor, and how is its value calculated?
Yes - a series base resistor is mandatory to limit base current. For -2A collector current and hFE ≥ 2,000, minimum base drive is -1mA; using VBE(on) ≈ -1.7V and 3.3V GPIO, RB = (3.3V − 1.7V)/1mA = 1.6kΩ - 1.5kΩ is typical for margin.
Can FZT705QTA replace older FZT705 devices in existing designs?
Yes - FZT705QTA is the automotive-qualified (AEC-Q101) and green-compliant version of the industrial FZT705. Electrical specs are identical; differences are qualification status, marking ("Q"), and halogen-free packaging - no layout or schematic changes needed.
FZT705QTA 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
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 120 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 1mA, 10mA
- Current - Collector Cutoff (Max):
- 500nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 180 @ 2mA, 6V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 140MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT705QTA FAQ
1.How can I place an order for FZT705QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT705QTA 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 FZT705QTA reliable?
The price and inventory of FZT705QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT705QTA is usually 5 days.
3.What payment methods are accepted for FZT705QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT705QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT705QTA?
FZT705QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT705QTA 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 FZT705QTA?
For technical support, including FZT705QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT705QTA requirements.
6.How does Aetrix verify that FZT705QTA is sourced from the original manufacturer or authorized distributors?
All FZT705QTA 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 FZT705QTA meets industry standards.
7.What is the process for return or replacement of FZT705QTA?
All FZT705QTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT705QTA, 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 FZT705QTA part is unused and in its original packaging.
Return procedure for FZT705QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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