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Diodes Incorporated FCX493QTA
- Part No.:
- FCX493QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
FCX493QTA.pdf
- Description:
- TRANS NPN 100V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:965
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Product details
Overview
FCX493QTA from Diodes Incorporated is a 100V NPN silicon planar medium-power bipolar junction transistor (BJT) in SOT89 package, rated for 1A continuous collector current, VCE(sat) < 0.3V at 500mA/50mA drive, and AEC-Q101 qualified for automotive load switching. It serves as a high-voltage, medium-current switch in solenoid drivers and DC–DC module control stages.
For engineers reviewing the FCX493QTA datasheet, FCX493QTA pinout, FCX493QTA application, or FCX493QTA equivalent, key selection criteria include VCEO = 100V, IC = 1A, thermal resistance RθJL = 10.01°C/W, AEC-Q101 qualification status, and SOT89 thermal pad layout compatibility.
Technical Context
This NPN BJT operates with a minimum hFE of 100 at IC = 1mA/VCE = 10V and maintains ≥60 at IC = 1A/VCE = 10V, supporting stable gain across load ranges. Its 150MHz ft enables fast switching in PWM-driven actuator interfaces up to ~100kHz.
The device features low VCE(sat) (0.3V typ. @ 500mA/50mA), enabling <150mW conduction loss at rated current, and integrates a thermally efficient SOT89 exposed collector pad with RθJL = 10.01°C/W for direct PCB heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Maximum safe collector-emitter voltage under operating conditions; supports 24V/48V automotive bus transients. |
| IC (continuous) | 1 A - Continuous collector current rating; enables direct driving of 500–800mA solenoids with margin. |
| VCE(sat) | < 0.3 V @ 500mA/50mA - Low saturation voltage reduces power dissipation to ≤150mW at mid-load. |
| hFE | 100–300 - DC current gain range ensures reliable base drive design across production lots and temperature. |
| ft | 150 MHz - Transition frequency supports clean switching edges in PWM frequencies up to 100kHz. |
| RθJL | 10.01 °C/W - Junction-to-lead thermal resistance enables >800mW power handling with minimal board copper. |
Pinout & Package
SOT89 package with molded green plastic case, exposed collector pad on underside, moisture sensitivity level 1, and matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current path output | Exposed metal pad on bottom surface; primary thermal path and high-current return node. |
| Base (B) | Control input | Drives transistor into saturation; requires ≥50mA for full 500mA load switching. |
| Emitter (E) | Current reference terminal | Connected to system ground or low-side return; defines VBE bias reference point. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM 4kV/MM 400V). |
| VCEO = 100V | Supports 48V battery systems with headroom for load-dump transients up to ISO 7637-2 Pulse 5a. |
| Low VCE(sat) | Reduces conduction loss by >40% vs. standard 1A BJTs, lowering thermal stress in confined PCB areas. |
| SOT89 thermal pad | Enables 1W dissipation with minimal copper area-no external heatsink required for typical 500ms ON-time loads. |
Applications
| Automotive Load Switching | Solenoid Driver |
|---|---|
Use Scenario: Controlling 12V/24V lighting modules and HVAC dampers in passenger compartment ECUs. IC Role / Device Role / Timing Role: Medium-power NPN switch turning ON/OFF resistive-inductive loads via microcontroller GPIO. Use Value: 100V rating withstands battery transients; low VCE(sat) minimizes self-heating during 100% duty-cycle operation. |
Use Scenario: Driving 500mA fuel injector or transmission solenoid in engine control units. IC Role / Device Role / Timing Role: High-current saturated switch delivering precise pulse-width modulated current pulses. Use Value: hFE ≥100 ensures consistent turn-on timing across temperature; 150MHz ft preserves edge fidelity at 10kHz PWM. |
| DC–DC Module Control | Relay Driver Interface |
Use Scenario: Enabling/disabling secondary-side synchronous rectifier control logic in isolated flyback converters. IC Role / Device Role / Timing Role: High-voltage level-shifting switch interfacing low-voltage controller to 60V+ auxiliary rail. Use Value: VCEO = 100V provides safety margin above 60V rail; RθJL = 10.01°C/W sustains 1W dissipation without derating. |
Use Scenario: Isolating microcontroller outputs from 12V/24V relay coils in body control modules. IC Role / Device Role / Timing Role: General-purpose NPN interface transistor providing current gain and voltage translation. Use Value: 1A IC rating supports relays up to 800mA coil current; AEC-Q101 ensures long-term reliability in vibration-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25050DFHTA | Higher VCEO (50V), lower VCE(sat) (0.17V), SOT23 package, no AEC-Q101 rating. | Limited to 24V systems; unsuitable for automotive PPAP programs requiring AEC-Q101 traceability. | Select only for non-automotive 24V industrial controls where space constraints outweigh qualification needs. |
| MJD122G | Higher IC (3A), TO-252 package, VCEO = 100V, but not AEC-Q101 qualified. | Requires larger PCB footprint; lacks automotive change control documentation and PPAP support. | Use when higher current headroom is needed and automotive qualification is not mandated. |
Compared with ZXTN25050DFHTA and MJD122G, FCX493QTA uniquely combines AEC-Q101 qualification, SOT89 thermal efficiency, and 100V/1A capability in a single automotive-compliant package-making it the only option for PPAP-capable 48V load switching in space-constrained ECUs.
Availability
FCX493QTA is available at Aetrix Electronics and suitable for automotive body control modules, solenoid driver circuits, and DC–DC enable functions requiring stable component supply across extended vehicle lifecycles.
Supply support for FCX493QTA 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 FCX493Q series belongs to Diodes' AEC-Q101-qualified bipolar transistor portfolio, engineered specifically for robust load-switching in harsh automotive environments with stringent thermal and transient requirements.
FAQ
Is FCX493QTA suitable for 48V automotive battery systems?
Yes. With VCEO = 100V and AEC-Q101 qualification, FCX493QTA supports 48V nominal systems and withstands ISO 7637-2 load-dump transients up to 120V. Its thermal design accommodates sustained operation at elevated ambient temperatures common in engine bay locations.
What is the recommended base resistor value for driving a 500mA solenoid?
At IC = 500mA and hFE ≥100, a base current of ≥5mA suffices-but datasheet testing uses 50mA for guaranteed saturation. For robustness, use RB = (3.3V – 1.15V)/50mA ≈ 43Ω when driven from a 3.3V MCU GPIO, ensuring VCE(sat) remains ≤300mV.
Does FCX493QTA require a heatsink in typical applications?
No. With RθJL = 10.01°C/W and 1W maximum power dissipation, the SOT89 exposed collector pad transfers heat directly to PCB copper. A 15mm² 1oz copper pour achieves sufficient cooling for 500mA continuous loads without external heatsinking.
How does FCX493QTA differ from standard FCX493 (non-Q) variants?
The "Q" suffix denotes AEC-Q101 qualification, PPAP capability, and manufacturing in IATF16949-certified facilities. Non-Q versions lack automotive change control documentation, failure analysis traceability, and the rigorous stress-test validation required for Tier 1 automotive supply chains.
FCX493QTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 250mA, 10V
- Power - Max:
- 1 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
FCX493QTA FAQ
1.How can I place an order for FCX493QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FCX493QTA 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 FCX493QTA reliable?
The price and inventory of FCX493QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FCX493QTA is usually 5 days.
3.What payment methods are accepted for FCX493QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FCX493QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FCX493QTA?
FCX493QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FCX493QTA 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 FCX493QTA?
For technical support, including FCX493QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FCX493QTA requirements.
6.How does Aetrix verify that FCX493QTA is sourced from the original manufacturer or authorized distributors?
All FCX493QTA 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 FCX493QTA meets industry standards.
7.What is the process for return or replacement of FCX493QTA?
All FCX493QTA units undergo pre-shipment inspection (PSI). If there is an issue with FCX493QTA, 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 FCX493QTA part is unused and in its original packaging.
Return procedure for FCX493QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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