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Diodes Incorporated FCX591ATA
- Part No.:
- FCX591ATA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
FCX591ATA.pdf
- Description:
- TRANS PNP 40V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
FCX591ATA from Diodes Incorporated is a 40V PNP medium-power transistor in SOT89 package, rated for -1A continuous collector current and featuring VCE(sat) < -500 mV at -1A. It delivers low-saturation switching performance with BVCEO = -40 V and hFE ≥ 300 at -1 mA, optimized for power MOSFET and IGBT gate driving in industrial motor control systems.
For engineers reviewing the FCX591ATA datasheet, FCX591ATA pinout, FCX591ATA application, or FCX591ATA equivalent, key selection criteria include its -40 V VCEO, -1 A IC, thermal resistance RθJL = 10.01 °C/W, JEDEC-qualified reliability, and SOT89 lead-frame thermal performance for high-duty-cycle switching.
Technical Context
This PNP bipolar junction transistor operates as a medium-power switch with complementary pairing to FCX491A (NPN). Its design emphasizes low VCE(sat) under high-current drive conditions and robust thermal conduction via the exposed collector pad in SOT89.
Rated for -65°C to +150°C operation and qualified per AEC-Q standards for high-reliability applications, it supports pulsed operation up to ICM = -2 A and fT = 150 MHz at IE = -50 mA, enabling fast turn-off in gate-drive circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -40 V - Ensures safe blocking of 36 V automotive or 24 V industrial rail transients without breakdown. |
| IC (cont.) | -1 A - Supports direct gate charging of 10 nF+ MOSFETs at 100 kHz switching frequencies. |
| VCE(sat) | < -500 mV @ -1 A - Minimizes conduction loss (≤ 0.5 W) during saturated switching in high-current drivers. |
| hFE | 300 @ -1 mA - Provides sufficient DC gain for stable base-current-limited biasing in discrete driver stages. |
| RθJL | 10.01 °C/W - Enables efficient heat transfer from junction to PCB copper through the exposed collector tab. |
| fT | 150 MHz - Supports fast turn-off response for sub-100 ns gate discharge in half-bridge drivers. |
Pinout & Package
Package: SOT89 - Surface-mount plastic package with exposed collector pad for enhanced thermal dissipation; 0.05 g mass; UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current sink terminal | Connected to exposed metal tab - must be soldered to large copper pour for thermal management. |
| Emitter (E) | Current source reference node | Provides return path for load current; tied to system ground or negative rail in high-side configurations. |
| Base (B) | Control input | Receives TTL/CMOS-compatible drive signal; requires current-limiting resistor to set IB for target IC. |
Key Features
| Feature | Design Value |
|---|---|
| Low saturation voltage | VCE(sat) < -500 mV at -1 A enables ≤0.5 W conduction loss in compact SOT89 footprint. |
| JEDEC-qualified reliability | Qualified to AEC-Q standards for high-reliability industrial and automotive gate-driver use. |
| Exposed collector thermal pad | SOT89 package delivers RθJL = 10.01 °C/W - 12× better than RθJA = 125 °C/W for ambient cooling. |
| Complementary NPN pairing | FCX491A provides matched PNP/NPN pair for push-pull gate-drive output stages. |
Applications
| Motor Drive Gate Control | Industrial Power Supply Sequencing |
|---|---|
Use Scenario: Driving the gate of a 600 V IGBT in a 3-phase BLDC inverter stage. IC Role / Device Role / Timing Role: PNP switch sinking gate current during turn-off to ensure fast, controlled voltage fall time. Use Value: VCE(sat) < -500 mV at -1 A reduces turn-off energy loss by >30% vs. higher-Vsat alternatives in same package. | Use Scenario: Enabling/disabling auxiliary 12 V rails in programmable industrial PSUs. IC Role / Device Role / Timing Role: Medium-power series pass switch controlling power-up sequencing timing. Use Value: -40 V VCEO and -1 A rating support reliable hold-off and current delivery across wide input ranges. |
| Automotive HVAC Blower Control | Programmable Load Switching |
Use Scenario: High-side switching of brushed DC blower motors in climate control modules. IC Role / Device Role / Timing Role: PNP configured as high-side load switch with base-driven enable logic. Use Value: AEC-Q qualified operation and -65°C to +150°C range ensure functional stability across vehicle thermal cycles. | Use Scenario: Discrete load switch for FPGA configuration banks or sensor bias rails. IC Role / Device Role / Timing Role: Current-controlled on/off switch with precise IC limiting via base resistor. Use Value: hFE ≥ 300 at low IC allows microcontroller GPIO direct drive without additional buffer stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | VCEO = -60 V, IC = -1 A, RθJA = 150 °C/W, no AEC-Q qualification | Higher voltage margin but inferior thermal performance and no automotive qualification | Prefer for non-automotive 48 V systems where voltage headroom outweighs thermal needs |
| MMBT5401 | VCEO = -60 V, IC = -200 mA, SOT23 package, RθJA = 300 °C/W | Lower current rating and significantly worse thermal resistance limits power handling | Only suitable for signal-level or low-duty-cycle switching below 200 mA |
Compared with ZTX653 and MMBT5401, FCX591ATA uniquely balances -40 V rating, -1 A capability, 10.01 °C/W junction-to-lead thermal resistance, and AEC-Q qualification - making it optimal for thermally constrained, high-reliability gate-drive and power-switching roles.
Availability
FCX591ATA is available at Aetrix Electronics and suitable for motor drive gate control, industrial power supply sequencing, automotive HVAC blower control, and programmable load switching requiring stable component supply and long-term production continuity.
Supply support for FCX591ATA 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-performance, high-reliability components for industrial, automotive, and computing markets.
The FCX591ATA belongs to Diodes' FCX family of medium-power transistors designed specifically for robust, thermally efficient gate driving and power switching in space-constrained industrial and automotive control modules.
FAQ
What is the maximum allowable base current for continuous operation?
The datasheet specifies a peak base current IB limit of -200 mA. For continuous operation, base current must be sized to maintain IC ≤ -1 A while ensuring VBE(sat) ≤ -1.1 V and junction temperature remains within -65°C to +150°C. Derating applies above +25°C ambient per the published thermal curve.
Can FCX591ATA be used in parallel configurations?
No - FCX591ATA lacks built-in emitter ballasting or matched hFE binning required for safe current sharing. Parallel use risks thermal runaway due to parameter variation and unequal RθJL paths. For higher current, select a single higher-rated device or use active current-balancing circuitry.
Is the SOT89 footprint compatible with standard reflow profiles?
Yes - FCX591ATA is rated for Moisture Sensitivity Level 1 per J-STD-020 and uses matte tin-plated leads compliant with MIL-STD-202 Method 208. Standard Pb-free reflow profiles (peak 260°C, 60–90 sec above 217°C) are supported when using recommended pad layout dimensions from Diodes' package outline documentation.
How does FCX591ATA differ from the automotive-grade FCX591AQ?
FCX591AQ is identical in electrical and thermal specifications but undergoes additional AEC-Q101 stress testing and is documented under a separate automotive-qualified datasheet. FCX591ATA is intended for industrial applications; FCX591AQ is required for automotive safety-critical systems where full AEC-Q101 compliance documentation is mandated.
FCX591ATA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 100mA, 5V
- Power - Max:
- 1 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
FCX591ATA FAQ
1.How can I place an order for FCX591ATA through Aetrix?
Please submit a Request for Quotation (RFQ) for FCX591ATA 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 FCX591ATA reliable?
The price and inventory of FCX591ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FCX591ATA is usually 5 days.
3.What payment methods are accepted for FCX591ATA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FCX591ATA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FCX591ATA?
FCX591ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FCX591ATA 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 FCX591ATA?
For technical support, including FCX591ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FCX591ATA requirements.
6.How does Aetrix verify that FCX591ATA is sourced from the original manufacturer or authorized distributors?
All FCX591ATA 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 FCX591ATA meets industry standards.
7.What is the process for return or replacement of FCX591ATA?
All FCX591ATA units undergo pre-shipment inspection (PSI). If there is an issue with FCX591ATA, 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 FCX591ATA part is unused and in its original packaging.
Return procedure for FCX591ATA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FCX591ATA Tags
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