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Diodes Incorporated FCX690BTA
- Part No.:
- FCX690BTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
FCX690BTA.pdf
- Description:
- TRANS NPN 45V 2A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:14,196
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Product details
Overview
FCX690BTA from Diodes Incorporated is a 45V NPN high-gain power transistor in SOT89 package, designed for medium-power switching and linear amplification in automotive and industrial control circuits. It delivers 2A continuous collector current, supports 6A peak pulse current, exhibits hFE > 400 at 1A, maintains VCE(sat) < 300mV at 1A, and dissipates up to 2W with RθJL = 5.31°C/W - enabling compact thermal design in motor drivers and DC-DC regulators.
For engineers reviewing the FCX690BTA datasheet, FCX690BTA pinout, FCX690BTA application, or FCX690BTA equivalent, key selection criteria include its AEC-Q101 qualification, low saturation voltage under high-current drive, complementary pairing with FCX790A, and SOT89 thermal performance on FR4 PCBs with exposed collector pad.
Technical Context
This NPN bipolar junction transistor operates with BVCEO = 45V and VEBO = 7V, supporting robust voltage margin in 24V automotive and industrial supply rails. Its hFE range of 500 (min @ 100mA) to 400 (typ @ 1A) enables stable current gain across load conditions, while fT = 150MHz ensures adequate bandwidth for PWM switching up to ~100kHz.
The device uses an exposed-collector SOT89 thermally enhanced package with RθJL = 5.31°C/W, directly referencing junction-to-solder-point resistance. ESD ratings meet JEDEC Class 3B (≥8kV HBM), confirming suitability for assembly environments and end-equipment handling without additional protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO / VCEO | 45V - supports operation in 24V systems with ≥2× safety margin against transients |
| IC (continuous) | 2A - drives solenoids, relays, or MOSFET gates without external heat sinking on 40mm² copper |
| VCE(sat) @ 1A | <300mV - limits conduction loss to <0.3W, reducing thermal stress in linear regulator stages |
| hFE @ 1A | 400 (typ) - enables low-base-drive current (5mA) for full collector conduction, easing MCU GPIO sourcing |
| fT | 150MHz - supports fast switching in PWM dimming and DC-DC pre-driver applications |
| RθJL | 5.31°C/W - allows direct thermal coupling to PCB copper pour, enabling 1.5W dissipation at +85°C ambient |
| ESD HBM | ≥8,000V - eliminates need for external ESD protection in board-level handling and functional testing |
Pinout & Package
Package: SOT89 - surface-mount plastic case with exposed collector tab for thermal and electrical connection; UL 94V-0 rated, moisture sensitivity level 1, weight ≈ 0.052g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current output path, electrically and thermally connected to exposed pad | Must be soldered to ≥15mm² copper pour for thermal management; serves as primary heat sink and power return |
| Emitter (E) | Current return node, referenced to system ground or low-side switch common | Provides low-impedance path for emitter-follower or grounded-emitter configurations; ties to GND plane |
| Base (B) | Control input for bipolar current amplification | Requires current-limited drive (≤500mA max); 5mA base current suffices for 2A collector conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive temperature cycling (-55°C to +150°C), vibration, and humidity stress - suitable for engine bay and body control modules |
| High hFE > 400 @ 1A | Reduces required base drive current by 2–3× versus standard power transistors, lowering MCU I/O loading and gate driver complexity |
| VCE(sat) < 300mV @ 1A | Minimizes power loss in saturated switching mode - critical for battery-powered actuators and energy-sensitive linear regulators |
| SOT89 exposed collector | Enables direct thermal transfer to PCB copper; achieves RθJL = 5.31°C/W - outperforms TO-92 and SOT23 in power density |
| Lead-free & Green | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); compliant with EU RoHS 2 and automotive ELV directives |
Applications
| Automotive Body Control Module | Industrial Solenoid Driver |
|---|---|
Use Scenario: Driving 12V/24V door lock actuators and mirror adjustment motors in BCM subassemblies. IC Role / Device Role / Timing Role: NPN power switch controlling solenoid coil current with PWM-enabled duty-cycle regulation. Use Value: Low VCE(sat) minimizes coil heating during hold state; AEC-Q101 rating ensures reliability over 15-year vehicle lifetime. |
Use Scenario: Switching 2A-rated pneumatic valves in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: High-current discrete switch interfacing microcontroller GPIO to inductive load. Use Value: 6A peak pulse rating handles solenoid turn-on surge; exposed collector pad sustains 1.2W dissipation without heatsink. |
| DC-DC Pre-regulator Stage | LED Constant-Current Sink |
Use Scenario: Linear pre-regulation stage before buck converter in multi-rail power supplies for instrumentation. IC Role / Device Role / Timing Role: Adjustable emitter-follower pass transistor regulating intermediate rail voltage. Use Value: High hFE ensures stable loop gain with minimal compensation; 45V rating accommodates wide input transients. |
Use Scenario: Precision constant-current sink for high-brightness LED arrays in signage and lighting controllers. IC Role / Device Role / Timing Role: Current-controlled linear driver with feedback resistor on emitter leg. Use Value: Tight hFE tolerance (500–1500) enables ±3% current accuracy; low VBE(on) improves reference voltage headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX690B (Diodes Inc.) | Same die, TO-92 package; RθJA = 200°C/W vs. SOT89's 62.5°C/W; no exposed collector | Limited to ≤0.5W continuous use; unsuitable for automotive under-hood or high-duty-cycle solenoid drive | Select when board space permits TO-92 and thermal load is <0.4W |
| MJD127G (ON Semiconductor) | 40V VCEO, 2A IC, hFE = 250–500 @ 1A; SOT-223 package; RθJL = 7°C/W | Lower voltage rating restricts use in 24V+ transient-prone systems; higher thermal resistance requires larger copper area | Prefer where cost sensitivity outweighs AEC-Q101 requirement and 45V margin is non-critical |
Compared with ZTX690B and MJD127G, FCX690BTA provides superior thermal performance via SOT89 exposed collector, guaranteed 45V breakdown for robustness in automotive environments, and tighter hFE consistency - making it optimal for space-constrained, high-reliability linear and switching power stages.
Availability
FCX690BTA is available at Aetrix Electronics and suitable for automotive body control modules, industrial solenoid drivers, and DC-DC pre-regulator stages requiring stable component supply, AEC-Q101 compliance, and SOT89 thermal efficiency.
Supply support for FCX690BTA 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 and manufacturing operations across Asia and the Americas.
FCX690BTA belongs to Diodes' high-reliability power transistor product line, engineered specifically for automotive and industrial applications demanding AEC-Q101 qualification, low saturation voltage, and thermally efficient SOT89 packaging.
FAQ
What is the maximum safe operating temperature for FCX690BTA?
The FCX690BTA has an operating junction temperature range of –55°C to +150°C. With RθJL = 5.31°C/W and 2W max power dissipation, sustained operation at 150°C requires the collector pad to be maintained at ≤139.4°C. Derating begins above +25°C ambient per the datasheet curve - at +85°C ambient, max continuous power drops to ~1.5W on a 40mm × 40mm PCB.
Is FCX690BTA pin-compatible with FCX790A?
No - FCX690BTA is an NPN transistor with pinout C–E–B (top view), while FCX790A is its PNP complement with reversed polarity and identical SOT89 mechanical footprint but different terminal assignment: its pinout is C–E–B with emitter and base swapped electrically. They share mounting compatibility but require separate PCB layouts due to opposite biasing requirements.
Can FCX690BTA be used in avalanche mode?
No - the datasheet does not specify avalanche energy rating (EAS) or ruggedness testing. Its BVCEO = 45V is a DC breakdown limit under pulsed conditions; operation beyond this voltage risks irreversible junction failure. For inductive load switching, external flyback diode protection is mandatory to clamp VCE during turn-off.
Does FCX690BTA require a base resistor in all applications?
Yes - unlike logic-level MOSFETs, this bipolar transistor requires controlled base current to avoid saturation delay or thermal runaway. For 2A collector current, hFE ≈ 400 demands ~5mA base drive; a 1kΩ resistor from a 5V MCU GPIO limits IB to 5mA, ensuring reliable turn-on while preventing excessive base dissipation. Values below 470Ω risk overdriving the base-emitter junction.
FCX690BTA 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):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 5mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 400 @ 1A, 2V
- Power - Max:
- 2 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
FCX690BTA FAQ
1.How can I place an order for FCX690BTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FCX690BTA 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 FCX690BTA reliable?
The price and inventory of FCX690BTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FCX690BTA is usually 5 days.
3.What payment methods are accepted for FCX690BTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FCX690BTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FCX690BTA?
FCX690BTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FCX690BTA 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 FCX690BTA?
For technical support, including FCX690BTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FCX690BTA requirements.
6.How does Aetrix verify that FCX690BTA is sourced from the original manufacturer or authorized distributors?
All FCX690BTA 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 FCX690BTA meets industry standards.
7.What is the process for return or replacement of FCX690BTA?
All FCX690BTA units undergo pre-shipment inspection (PSI). If there is an issue with FCX690BTA, 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 FCX690BTA part is unused and in its original packaging.
Return procedure for FCX690BTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FCX690BTA Tags
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