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Diodes Incorporated FZT690BQTA
- Part No.:
- FZT690BQTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT690BQTA.pdf
- Description:
- TRANS NPN 45V 3A SOT-223
- Quantity:
- Payment:
- Shipping:
Inventory:7,257
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Product details
Overview
FZT690BQTA from Diodes Incorporated is a 45V, 3A NPN medium-power high-gain transistor in SOT223 package, featuring hFE > 400 at 1A, RCE(SAT) = 125 mΩ at 2A, and AEC-Q101 qualification for automotive reliability. It serves as a Darlington replacement and low-saturation switch in DC-DC converters and siren drivers.
For engineers reviewing the FZT690BQTA datasheet, FZT690BQTA pinout, FZT690BQTA application, or FZT690BQTA equivalent, key selection criteria include VCEO = 45 V, IC = 3.0 A continuous, hFE ≥ 400 @ 1A, RCE(SAT) = 125 mΩ @ 2A, and AEC-Q101 qualification for automotive-grade thermal and ESD robustness.
Technical Context
This NPN bipolar junction transistor operates with a minimum BVCEO of 45 V and supports continuous collector current up to 3.0 A. Its high DC current gain (hFE ≥ 400 at IC = 1A, VCE = 2V) enables efficient base drive reduction in switching applications.
Thermal performance is defined by RθJA = 41.7 °C/W on 50 mm × 50 mm 2 oz copper PCB and RθJL = 12.9 °C/W to lead, supporting stable operation up to TJ = +150 °C. ESD ratings meet HBM 4 kV and MM 400 V per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage before breakdown under open-base conditions |
| IC (continuous) | 3.0 A - Continuous collector current rating enabling use in medium-power load switching |
| hFE @ 1A | ≥ 400 - High DC current gain reduces required base drive current and driver-stage complexity |
| RCE(SAT) @ 2A | 125 mΩ - Low saturation resistance minimizes conduction loss and self-heating in switching mode |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including temperature cycling, HTRB, and ESD stress |
| ESD HBM | 4,000 V - Robust electrostatic discharge immunity supports handling and assembly in production environments |
| TJ Range | –55 °C to +150 °C - Wide junction temperature range supports under-hood and industrial ambient conditions |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin configuration with exposed collector tab for thermal dissipation. Molded green compound, UL 94V-0 rated, 0.112 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | E | Current return path; connected to ground or low-side reference in common-emitter configurations |
| Pin 2 (Base) | B | Control input; requires ~5 mA drive at IC = 1A for full saturation due to hFE ≥ 400 |
| Pin 3 (Collector) | C | Main power output node; electrically and thermally tied to exposed metal tab for heatsinking |
| Pin 4 (Collector Tab) | C (redundant) | Primary thermal interface; must be soldered to large copper pour for RθJA ≤ 41.7 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| High hFE at high current | hFE ≥ 400 @ IC = 1A ensures minimal base drive loss and simplifies driver circuit design |
| Low RCE(SAT) | 125 mΩ @ 2A reduces I²R conduction loss to <500 mW, improving efficiency in PWM loads |
| AEC-Q101 qualification | Validated for automotive temperature, humidity, and mechanical stress requirements per JESD22 |
| Green, RoHS-compliant construction | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental mandates |
| Thermally enhanced SOT223 | Exposed collector tab enables direct thermal coupling to PCB copper, supporting 3.0 W dissipation with proper layout |
Applications
| Automotive Siren Drivers | DC-DC Converter Switch |
|---|---|
Use Scenario: Driving high-current piezoelectric or electromechanical sirens in vehicle alarm systems requiring fast turn-on and thermal resilience. IC Role / Device Role / Timing Role: NPN power switch controlling siren coil current with pulsed 2–3 A peaks and 100% duty cycle capability. Use Value: Low VCE(SAT) and high hFE enable direct MCU GPIO drive without external buffer stages, reducing BOM count. | Use Scenario: High-efficiency synchronous rectifier or main switch in 12 V–48 V automotive DC-DC buck converters. IC Role / Device Role / Timing Role: Medium-power switching element operating at ≤100 kHz with low conduction loss and stable gain across temperature. Use Value: RCE(SAT) = 125 mΩ at 2A limits power loss to 500 mW, allowing compact thermal design without heatsinks. |
| Darlington Pair Replacement | Battery-Powered Flash Converters |
Use Scenario: Replacing legacy Darlington transistors in industrial control outputs where higher speed and lower base current are needed. IC Role / Device Role / Timing Role: Single-transistor alternative delivering comparable current gain but faster tON (33 ns) and tOFF (1300 ns). Use Value: Eliminates second transistor and base resistor, reducing footprint by 40% and improving switching consistency. | Use Scenario: Boost converter switch in portable camera flash circuits powered by single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: High-gain, low-VCE(SAT) switch enabling efficient energy transfer from battery to capacitor bank at 1–5 kHz. Use Value: hFE ≥ 400 at 0.1–1 A allows microcontroller-level base drive, extending battery life via reduced driver losses. |
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 (60 V), lower hFE (min 250 @ 1A), SOT223-3 (no emitter tab) | Lacks dedicated emitter terminal; less optimal for emitter-follower or grounded-emitter precision biasing | Preferred when higher voltage margin is critical and thermal load is moderate |
| MJD127G | TO-220 package, higher PD (15 W), hFE min 50 @ 1A (lower gain) | Requires heatsink for >1 A; larger footprint and slower switching (tOFF > 2 µs) | Chosen when mechanical mounting and higher power dissipation outweigh PCB space constraints |
Compared with ZXTN25050DFHTA and MJD127G, FZT690BQTA delivers superior gain-to-saturation trade-off in SOT223, enabling compact, low-loss switching in automotive and portable power stages without compromising thermal or ESD robustness.
Availability
FZT690BQTA is available at Aetrix Electronics and suitable for automotive siren drivers, DC-DC converters, battery-powered flash circuits, and Darlington replacements requiring stable component supply and AEC-Q101 compliance.
Supply support for FZT690BQTA 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 consumer markets.
FZT690BQTA belongs to Diodes' AEC-Q101-qualified medium-power transistor product line, designed specifically for thermally demanding, high-current switching roles in automotive subsystems and portable power conversion.
FAQ
What is the maximum continuous collector current for FZT690BQTA?
The FZT690BQTA supports a continuous collector current of 3.0 A at TA = +25°C with appropriate PCB copper area (50 mm × 50 mm, 2 oz). Derating applies above +25°C ambient; at +100°C, max IC drops to approximately 1.8 A per the published derating curve.
Is FZT690BQTA pin-compatible with standard SOT223 NPN transistors?
Yes - FZT690BQTA uses the standard SOT223-4 pinout (E-B-C-tab), matching industry-standard footprint and pad layout. Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector, Pin 4 = Collector tab. No adapter or redesign is needed for drop-in replacement in existing SOT223 layouts.
Does FZT690BQTA require a heatsink in typical applications?
No external heatsink is required if mounted per Diodes' recommended pad layout (minimum 25 mm × 25 mm 2 oz copper) and operated below 2 A continuous. At 3 A with 50 mm × 50 mm copper, junction temperature remains within spec (<150°C) at +70°C ambient, leveraging the low RθJA of 41.7 °C/W.
How does AEC-Q101 qualification impact FZT690BQTA's use in non-automotive designs?
AEC-Q101 qualification ensures enhanced reliability - including extended temperature cycling, HTRB, and ESD testing - making FZT690BQTA suitable for industrial, medical, and high-end consumer applications where long-term stability and failure rate are critical, even outside automotive contexts.
FZT690BQTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 5mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 500 @ 100mA, 2V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
FZT690BQTA FAQ
1.How can I place an order for FZT690BQTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT690BQTA 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 FZT690BQTA reliable?
The price and inventory of FZT690BQTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT690BQTA is usually 5 days.
3.What payment methods are accepted for FZT690BQTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT690BQTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT690BQTA?
FZT690BQTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT690BQTA 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 FZT690BQTA?
For technical support, including FZT690BQTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT690BQTA requirements.
6.How does Aetrix verify that FZT690BQTA is sourced from the original manufacturer or authorized distributors?
All FZT690BQTA 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 FZT690BQTA meets industry standards.
7.What is the process for return or replacement of FZT690BQTA?
All FZT690BQTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT690BQTA, 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 FZT690BQTA part is unused and in its original packaging.
Return procedure for FZT690BQTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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