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Diodes Incorporated FCX591QTA
- Part No.:
- FCX591QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
FCX591QTA.pdf
- Description:
- TRANS PNP 60V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,782
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Product details
Overview
FCX591QTA from Diodes Incorporated is a 60V PNP medium-power bipolar junction transistor in SOT89 package, rated for -1A continuous collector current, -60V VCEO, and 295mΩ RCE(SAT) at -1A/-100mA drive; designed for automotive load switching and power control circuits requiring AEC-Q101 qualification.
For engineers reviewing the FCX591QTA datasheet, FCX591QTA pinout, FCX591QTA application, or FCX591QTA equivalent, key selection criteria include guaranteed high-current hFE (≥100 at -1A), low saturation voltage under automotive ambient conditions, thermal performance on 1oz/2oz copper PCBs, and complementary pairing with FCX491 NPN.
Technical Context
This PNP BJT operates as a medium-power switch in linear or saturated mode, with breakdown ratings of -80V VCBO and -7V VEBO, enabling robust operation in 12V/24V automotive systems. Its hFE is characterized up to -2A, supporting stable gain in high-current switching applications.
Thermal design relies on the exposed collector pad: RθJA ranges from 125°C/W (15mm×15mm 1oz Cu) to 60°C/W (50mm×50mm 1oz Cu); RθJC is 16°C/W, confirming efficient heat transfer from junction to case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -60V - Withstands reverse-biased collector-emitter voltage in automotive battery transients |
| IC (cont.) | -1A - Supports sustained load currents typical of fuel pump drivers or HVAC actuators |
| RCE(SAT) | 295mΩ @ -1A/-100mA - Enables <300mV dropout at 1A, minimizing conduction loss and self-heating |
| hFE | 100–300 - Maintains usable current gain across -1mA to -2A, critical for base-drive sizing |
| PD | 2.0W @ 50mm×50mm 1oz Cu - Delivers >1.5× power handling vs standard SOT89 layouts |
| ESD HBM | 4,000V - Meets AEC-Q101 ESD robustness for assembly and field reliability |
| TJ range | -65°C to +150°C - Fully operational across automotive under-hood temperature extremes |
Pinout & Package
SOT89 package with exposed collector pad for thermal dissipation; molded green plastic housing (UL 94V-0), matte tin-plated leads, 0.05g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current sink terminal | Exposed metal pad - must be soldered to ≥15mm² copper area for rated power dissipation |
| Emitter (E) | Current source reference node | Connected to higher potential rail (e.g., battery+) in high-side switch configurations |
| Base (B) | Control input for turn-on/turn-off | Requires -100mA drive for full saturation at -1A; VBE(sat) = -1.2V max ensures predictable drive requirements |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTOL, TC, UHAST, and ESD |
| Low RCE(SAT) | 295mΩ enables <0.3W conduction loss at 1A, reducing thermal derating needs |
| High-current hFE characterization | hFE ≥155 at -1A ensures reliable saturation with moderate base drive in power stages |
| Green, lead-free construction | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) meets global environmental compliance mandates |
| PPAP capable | Supports production part approval process documentation for Tier-1 automotive suppliers |
Applications
| Fuel Pump Driver | HVAC Blower Control |
|---|---|
Use Scenario: Switching 12V DC brushed motor loads drawing up to 1A peak current in passenger vehicle fuel delivery systems. IC Role / Device Role / Timing Role: PNP high-side switch controlling motor power path; driven by microcontroller GPIO via base resistor network. Use Value: -60V VCEO withstands load-dump transients; low RCE(SAT) limits self-heating during continuous operation. | Use Scenario: Regulating airflow in climate control systems using PWM-driven DC blower motors. IC Role / Device Role / Timing Role: Medium-power switching element in discrete H-bridge or single-ended driver stage. Use Value: Stable hFE up to -2A supports accurate current control across speed range; AEC-Q101 ensures long-term reliability in cabin environment. |
| Body Control Module (BCM) Load Switch | Engine Management Solenoid Driver |
Use Scenario: Driving resistive and inductive loads (e.g., door locks, mirror heaters) in centralized vehicle body controllers. IC Role / Device Role / Timing Role: Discrete PNP switch replacing integrated load drivers where cost, thermal, or failure-mode isolation is prioritized. Use Value: Exposed collector pad allows direct thermal coupling to chassis ground plane; -150°C TJ rating accommodates sealed BCM enclosures. | Use Scenario: Controlling fuel injector solenoids or EGR valve actuators requiring precise 1A-level current pulses. IC Role / Device Role / Timing Role: Fast-switching saturated transistor delivering controlled current pulses with minimal delay and overshoot. Use Value: fT = 150MHz ensures adequate bandwidth for sub-µs turn-on/turn-off; low VCE(sat) reduces energy loss per pulse cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX951 | VCEO = -60V, IC = -1A, but RCE(SAT) = 400mΩ @ -1A; no AEC-Q101 qualification | Not suitable for automotive production; limited to industrial or consumer-grade designs | Select only if AEC-Q101 is not required and thermal margin permits higher saturation loss |
| MJD2955G | VCEO = -60V, IC = -10A, TO-220 package; RCE(SAT) = 200mΩ but requires larger board area and heatsinking | Over-specified current capability increases cost and footprint; unsuitable for space-constrained SOT89 layouts | Choose only when >1A peak current or higher power dissipation (>2W) is needed and TO-220 mounting is acceptable |
Compared with ZTX951 and MJD2955G, FCX591QTA uniquely balances AEC-Q101 compliance, SOT89 compactness, and optimized RCE(SAT)/hFE trade-off for 1A automotive switching-making it the only drop-in solution meeting both thermal and qualification constraints in tight-layout modules.
Availability
FCX591QTA is available at Aetrix Electronics and suitable for automotive fuel systems, HVAC controls, body electronics, and engine management subsystems requiring stable component supply and AEC-Q101 traceability.
Supply support for FCX591QTA 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 FCX591QTA belongs to Diodes' AEC-Q101-qualified bipolar transistor product line, engineered specifically for automotive power switching applications demanding robustness, thermal efficiency, and regulatory compliance.
FAQ
What is the maximum safe operating temperature for FCX591QTA in continuous conduction?
The FCX591QTA has an operating junction temperature range of -65°C to +150°C. For continuous 1A operation, thermal design must ensure TJ stays ≤150°C - achievable with ≥25mm×25mm 1oz copper (RθJA = 83°C/W) and ambient ≤85°C. Derating curves in the datasheet confirm 1.5W max at 100°C ambient.
Does FCX591QTA require a heatsink in standard SOT89 PCB layout?
No external heatsink is required if the exposed collector pad is soldered to ≥25mm² of 1oz copper on a single-layer FR4 board. The device achieves 1.5W power dissipation without added thermal hardware under still-air conditions; larger copper areas further eliminate need for mechanical heatsinks.
How does FCX591QTA's hFE behavior differ from general-purpose PNP transistors at high current?
Unlike standard PNPs whose hFE collapses above 500mA, FCX591QTA maintains hFE ≥155 at -1A and ≥40 at -2A - verified under pulsed conditions. This enables predictable base drive design for automotive loads without over-sizing driver stages or adding feedback compensation.
Can FCX591QTA be used as a direct replacement for FCX591 in non-automotive applications?
Yes - FCX591QTA shares identical electrical and thermal specifications with FCX591, differing only in tape-and-reel packaging (1,000 pcs/reel, 12mm tape). Both parts use the same die and SOT89 construction; FCX591QTA is fully interchangeable where reel-fed automated assembly is required.
FCX591QTA 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):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 500mA, 5V
- Power - Max:
- 1 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
FCX591QTA FAQ
1.How can I place an order for FCX591QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FCX591QTA 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 FCX591QTA reliable?
The price and inventory of FCX591QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FCX591QTA is usually 5 days.
3.What payment methods are accepted for FCX591QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FCX591QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FCX591QTA?
FCX591QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FCX591QTA 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 FCX591QTA?
For technical support, including FCX591QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FCX591QTA requirements.
6.How does Aetrix verify that FCX591QTA is sourced from the original manufacturer or authorized distributors?
All FCX591QTA 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 FCX591QTA meets industry standards.
7.What is the process for return or replacement of FCX591QTA?
All FCX591QTA units undergo pre-shipment inspection (PSI). If there is an issue with FCX591QTA, 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 FCX591QTA part is unused and in its original packaging.
Return procedure for FCX591QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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