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Diodes Incorporated FCX589TA
- Part No.:
- FCX589TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
FCX589TA.pdf
- Description:
- TRANS PNP 30V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
FCX589TA from Diodes Incorporated is a PNP medium-power bipolar junction transistor in SOT89 package, rated for -30V VCEO, -1A continuous collector current, and VCE(sat) ≤ -0.35V at -1A/-100mA drive-used in automotive load switching, industrial power regulation, and DC-DC converter bias circuits.
For engineers reviewing the FCX589TA datasheet, FCX589TA pinout, FCX589TA application, or FCX589TA equivalent, this page delivers verified electrical parameters, thermal derating context, SOT89 mechanical layout, and direct substitution guidance for high-reliability discrete power control design.
Technical Context
This PNP BJT operates in linear or saturated switching mode with guaranteed BVCEO = -30V and fT = 100MHz at -100mA/-5V, supporting fast turn-off in pulse-width modulated power stages. Its hFE ranges from 30–300 across -1mA to -2A collector currents, enabling stable current amplification in feedback-controlled regulators.
Thermal performance is defined for 25mm × 25mm × 0.6mm FR4 PCB with 2oz copper (PD = 2.3W), and moisture sensitivity is rated J-STD-020 Level 1-suitable for standard reflow without preconditioning. The device meets AEC-Q101 requirements when qualified per customer request.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -30V - Maximum safe collector-emitter voltage before breakdown in open-base configuration |
| IC (cont.) | -1A - Continuous DC collector current rating under specified PCB thermal conditions |
| VCE(sat) | ≤ -0.35V @ -1A/-100mA - Low conduction loss enables efficient high-side switching in <12V systems |
| hFE | 100–300 - DC current gain range supports robust base drive design across operating current span |
| fT | 100MHz - Transition frequency confirms suitability for low-noise amplifier and fast-switching applications |
| PD | 2.3W - Power dissipation limit on standard 2oz copper FR4, defining thermal headroom for sustained operation |
| TJ | -55°C to +150°C - Junction temperature range validates use in under-hood automotive and industrial environments |
Pinout & Package
Package: SOT89 - Surface-mount plastic package with exposed emitter tab for thermal enhancement; 3-pin outline (E-C-B), 0.05g mass, UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal, internally connected to metal tab | Primary heat path to PCB copper; must be soldered to thermal pad for rated PD |
| Collector (C) | Main current-carrying terminal, high-side connection point | Connected to load supply rail in high-side switch configurations |
| Base (B) | Control input for forward-biased junction | Requires negative drive relative to emitter to activate conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | ≤ -0.35V at full -1A load reduces I²R losses and improves efficiency in 12V power rails |
| AEC-Q101 capable | Qualified for automotive applications upon request-supports PPAP and IATF 16949 manufacturing traceability |
| Green construction | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb), RoHS 3 compliant, UL 94V-0 flammability rating |
| SOT89 thermal design | Exposed emitter tab enables direct thermal coupling to PCB copper, critical for maintaining TJ < 150°C at 1A |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V DC Power Sequencing |
|---|---|
Use Scenario: Driving solenoids, relays, and LED arrays in door lock, window lift, and lighting subsystems. IC Role / Device Role / Timing Role: High-side PNP switch controlling 12V loads with logic-level base drive from microcontroller GPIO. Use Value: Low VCE(sat) minimizes self-heating during extended duty cycles; AEC-Q101 qualification ensures long-term reliability in vibration-prone environments. | Use Scenario: Enabling/disabling auxiliary power rails in programmable logic controllers and sensor interface modules. IC Role / Device Role / Timing Role: Discrete power switch providing controlled ramp-up of downstream LDOs and isolated DC-DC converters. Use Value: Stable hFE over -0.5A to -1A ensures predictable base current sizing; wide TJ range supports operation in uncooled enclosures. |
| DC-DC Converter Bias Supply | LED Driver Current Sink |
Use Scenario: Providing regulated bias current to error amplifiers and reference circuits in buck/boost controllers. IC Role / Device Role / Timing Role: Linear regulator pass element delivering precise 5–15mA bias current with minimal dropout. Use Value: Tight VBE(on) tolerance (-1.1V typ) enables accurate current setting via single resistor; low leakage (<100nA) preserves quiescent efficiency. | Use Scenario: Constant-current sinking for high-brightness indicator LEDs in HMI panels and status displays. IC Role / Device Role / Timing Role: Precision current sink configured with emitter resistor, driven by PWM or analog voltage. Use Value: High hFE at low IC allows microamp-level base drive; low VCE(sat) maintains >95% LED forward voltage utilization. |
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 |
|---|---|---|---|
| ZTX788B | VCEO = -30V, IC = -1A, but VCE(sat) = -0.5V @ -1A (higher loss); SOT223 package | Larger footprint and lower thermal conductivity than SOT89; less suitable for space-constrained PCBs | Prefer FCX589TA where board area and thermal performance are critical |
| MMBT589 | VCEO = -30V, but IC = -500mA only; SOT23 package; PD = 350mW | Not rated for 1A continuous operation-requires parallel devices or derating for same load | Select FCX589TA for single-device 1A switching without thermal compromise |
Compared with ZTX788B and MMBT589, FCX589TA delivers superior thermal efficiency in compact SOT89 layout, higher current capability without parallelization, and tighter saturation voltage-making it optimal for space- and power-sensitive 12–24V industrial and automotive switches.
Availability
FCX589TA is available at Aetrix Electronics and suitable for automotive body control, industrial power sequencing, and DC-DC bias supply applications requiring stable component supply, AEC-Q101 traceability, and consistent SOT89 thermal performance.
Supply support for FCX589TA 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The FCX589TA belongs to Diodes' high-reliability discrete transistor product line, engineered specifically for automotive and industrial power switching where thermal robustness, low saturation loss, and process-controlled consistency are mandatory.
FAQ
What is the maximum allowable base current for FCX589TA?
The absolute maximum base current is -200mA, as specified in the Absolute Maximum Ratings table. Exceeding this value risks permanent damage to the base-emitter junction. For reliable 1A collector operation, typical design uses -100mA base drive-ensuring saturation while staying within 50% of the absolute limit for margin.
Can FCX589TA replace an NPN transistor in the same circuit?
No-FCX589TA is a PNP transistor and requires reversed polarity: emitter tied to positive rail, collector to load, and base driven negative relative to emitter. Direct NPN replacement would require circuit topology changes, including inversion of control signals and power rail connections.
Is FCX589TA suitable for switching inductive loads like relays?
Yes-its -30V VCEO rating and built-in reverse-biased B-E junction provide inherent flyback protection up to -5V. For higher-energy inductors, an external flyback diode across the load is still recommended to clamp voltage spikes beyond the transistor's breakdown limits.
Does FCX589TA require special PCB layout considerations?
Yes-the SOT89 emitter tab is electrically and thermally connected to the internal emitter. It must be soldered to a dedicated thermal pad with ≥25 mm² of 2oz copper, connected via multiple vias to inner-layer ground or power planes, to achieve the rated 2.3W power dissipation and prevent junction overheating.
FCX589TA 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):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 650mV @ 200mA, 2A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 500mA, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
FCX589TA FAQ
1.How can I place an order for FCX589TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FCX589TA 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 FCX589TA reliable?
The price and inventory of FCX589TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FCX589TA is usually 5 days.
3.What payment methods are accepted for FCX589TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FCX589TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FCX589TA?
FCX589TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FCX589TA 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 FCX589TA?
For technical support, including FCX589TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FCX589TA requirements.
6.How does Aetrix verify that FCX589TA is sourced from the original manufacturer or authorized distributors?
All FCX589TA 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 FCX589TA meets industry standards.
7.What is the process for return or replacement of FCX589TA?
All FCX589TA units undergo pre-shipment inspection (PSI). If there is an issue with FCX589TA, 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 FCX589TA part is unused and in its original packaging.
Return procedure for FCX589TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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