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Diodes Incorporated FCX705TA
- Part No.:
- FCX705TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
FCX705TA.pdf
- Description:
- TRANS PNP DARL 120V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:13,964
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Product details
Overview
FCX705TA from Diodes Incorporated is a 120V PNP Darlington transistor in SOT89 package, designed for high-voltage switching with BVCEO = −120 V, hFE > 3,000 @ −1 A, VCE(SAT) < −1.3 V @ −1 A, IC = −1 A continuous, and AEC-Q101 qualified for automotive-grade reliability. It drives lamps, relays, and solenoids in industrial control modules.
For engineers reviewing the FCX705TA datasheet, FCX705TA pinout, FCX705TA application, or FCX705TA equivalent, key selection criteria include guaranteed high DC current gain at 1A, low saturation voltage under heavy load, thermal resistance (RθJL = 5.2 °C/W), and SOT89 lead-frame thermal performance in space-constrained PCB layouts.
Technical Context
This PNP Darlington pair integrates two cascaded transistors to achieve high current gain while maintaining robust breakdown ratings: VCBO = −140 V, VEBO = −10 V, and ESD HBM rating of 2,000 V. Its structure enables stable operation up to +150 °C junction temperature.
The device operates with base-emitter turn-on voltage VBE(ON) = −1.7 V @ −1 A and transition frequency fT = 160 MHz, supporting fast-switching applications where gain-bandwidth trade-offs must be managed without compromising saturation behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −120 V - Ensures safe operation in 100 V DC bus or flyback snubber circuits without avalanche stress. |
| hFE | >3,000 @ −1 A - Reduces required base drive current to ≤ −1 mA for full collector conduction, easing MCU GPIO sourcing. |
| VCE(SAT) | < −1.3 V @ −1 A - Limits power loss to <1.3 W at full load, critical for thermally constrained SOT89 mounting. |
| RθJL | 5.2 °C/W - Enables direct thermal coupling to PCB copper pour, supporting >0.8 W steady-state dissipation with minimal heatsinking. |
| ESD HBM | 2,000 V - Meets IEC 61000-4-2 Level 3 requirements for assembly-line handling and board-level transient immunity. |
| fT | 160 MHz - Supports clean turn-on/turn-off transitions in PWM-driven solenoid control below 20 kHz. |
Pinout & Package
Package: SOT89 - surface-mount plastic package with exposed collector pad for enhanced thermal conduction; 0.052 g mass; UL 94V-0 rated molding compound; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current sink path | Exposed metal tab - must be soldered to ≥15 mm² 1 oz copper for RθJA = 139 °C/W rating. |
| Emitter (E) | Current return reference | Connected to system ground or negative rail; sets VCE operating window relative to base bias. |
| Base (B) | Control input node | Requires −1 mA drive for full −1 A output; high hFE minimizes series resistor sizing and layout parasitics. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics per stress test requirements including HTOL, TCT, and ESD. |
| Green compound construction | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets EU ELV and JGPSSI environmental mandates. |
| Low VCE(SAT) at high current | −1.3 V @ −1 A ensures <1.3 W conduction loss - reduces thermal derating need in sealed enclosures. |
| SOT89 thermal efficiency | RθJL = 5.2 °C/W enables >0.8 W continuous dissipation with standard PCB copper - no external heatsink required. |
Applications
| Automotive Relay Drivers | Industrial Solenoid Controls |
|---|---|
Use Scenario: Driving 12 V/24 V automotive relays in BCM modules with microcontroller GPIO-limited base drive. IC Role / Device Role / Timing Role: High-gain PNP switch enabling single-stage inversion and load sinking without external driver stages. Use Value: Eliminates need for Darlington arrays or MOSFET gate drivers, reducing BOM count and PCB area by 30% in compact junction boxes. |
Use Scenario: Controlling pneumatic solenoids in factory automation PLC I/O modules operating at ambient up to +85 °C. IC Role / Device Role / Timing Role: Robust high-current switch tolerant of inductive kickback and repeated hot-plug cycles. Use Value: Withstands 4 A peak pulse current and −120 V VCEO, enabling direct connection to 24 V DC solenoid coils without clamping diodes. |
| LED Lamp Dimming Circuits | High-Voltage DC Motor Braking |
Use Scenario: PWM-controlled dimming of high-brightness LED strings in commercial lighting fixtures powered from 48 V DC rails. IC Role / Device Role / Timing Role: Low-saturation PNP switch regulating current through LED cathode path during duty-cycle modulation. Use Value: VCE(SAT) < −1.3 V at −1 A limits forward voltage drop across switch, preserving >97% of rail voltage for LEDs. |
Use Scenario: Dynamic braking of brushed DC motors in battery-powered tools, dissipating back-EMF energy into resistive loads. IC Role / Device Role / Timing Role: Fast-turnoff (tOFF = 0.8 µs) switch routing motor current to brake resistor during deceleration. Use Value: 160 MHz fT and low storage time ensure clean commutation edges, minimizing brake resistor thermal overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX951 | VCEO = −100 V, hFE = 1,000–4,000 @ −1 A, SOT223 package, RθJA = 125 °C/W | Limited to ≤80 V systems; higher thermal resistance requires larger copper area for same power dissipation. | Choose when cost sensitivity outweighs voltage margin and thermal constraints allow larger footprint. |
| MJD127 | VCEO = −100 V, hFE = 1,000–8,000 @ −1 A, TO-252 package, RθJA = 60 °C/W | Higher voltage headroom needed for 100+ V transient suppression; TO-252 offers better thermal performance but larger board area. | Prefer for industrial motor controls requiring >0.9 W continuous dissipation and mechanical ruggedness over SMT density. |
Compared with ZTX951 and MJD127, FCX705TA delivers superior voltage margin (−120 V), best-in-class RθJL (5.2 °C/W), and AEC-Q101 compliance - making it optimal for space-constrained, high-reliability automotive and industrial switching where thermal and voltage safety margins are non-negotiable.
Availability
FCX705TA is available at Aetrix Electronics and suitable for automotive relay drivers, industrial solenoid controls, and high-voltage LED lamp dimming requiring stable component supply and long-term production continuity.
Supply support for FCX705TA 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 automotive, industrial, and consumer markets.
The FCX705TA belongs to Diodes' AEC-Q101-qualified bipolar transistor product line, engineered specifically for high-voltage, high-gain switching in harsh-environment automotive and industrial control applications.
FAQ
What is the maximum continuous collector current for FCX705TA?
The FCX705TA supports −1 A continuous collector current at TA = +25 °C with proper PCB thermal design (15 mm × 15 mm 1 oz copper). Derating begins above +25 °C at 7.2 mW/°C, reaching zero current capability at +150 °C junction temperature per absolute maximum ratings.
Does FCX705TA require an external flyback diode when driving inductive loads?
Yes - although FCX705TA has −120 V VCEO rating, it is not internally clamped. Inductive loads like relays and solenoids must use an external reverse-biased diode (e.g., 1N4007) across the coil to suppress flyback voltage spikes exceeding the transistor's breakdown limit.
Can FCX705TA be used in surface-mount reflow processes?
Yes - FCX705TA is qualified for lead-free reflow per J-STD-020, with moisture sensitivity level 1. Standard Pb-free profile (peak 260 °C, 10 s max) is supported; matte tin-plated leads ensure reliable solder wetting without post-reflow cleaning.
How does the SOT89 package affect thermal performance compared to TO-92 or SOT23?
The SOT89's exposed collector pad provides direct thermal path to PCB copper, achieving RθJL = 5.2 °C/W - significantly lower than TO-92 (≈200 °C/W) or SOT23 (≈220 °C/W). This allows FCX705TA to dissipate >0.8 W continuously on standard FR-4, unlike smaller packages limited to ~0.3 W.
FCX705TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP - Darlington
- Current - Collector (Ic) (Max):
- 1 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:
- 1 W
- Frequency - Transition:
- 160MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
FCX705TA FAQ
1.How can I place an order for FCX705TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FCX705TA 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 FCX705TA reliable?
The price and inventory of FCX705TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FCX705TA is usually 5 days.
3.What payment methods are accepted for FCX705TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FCX705TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FCX705TA?
FCX705TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FCX705TA 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 FCX705TA?
For technical support, including FCX705TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FCX705TA requirements.
6.How does Aetrix verify that FCX705TA is sourced from the original manufacturer or authorized distributors?
All FCX705TA 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 FCX705TA meets industry standards.
7.What is the process for return or replacement of FCX705TA?
All FCX705TA units undergo pre-shipment inspection (PSI). If there is an issue with FCX705TA, 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 FCX705TA part is unused and in its original packaging.
Return procedure for FCX705TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FCX705TA Tags
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