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Diodes Incorporated FZT689BTC
- Part No.:
- FZT689BTC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT689BTC.pdf
- Description:
- TRANS NPN 20V 3A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,858
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Product details
Overview
FZT689BTC from Diodes Incorporated is a 20V NPN medium-power transistor in SOT223 package, rated for 3.0A continuous collector current, with hFE > 400 at 2A and VCE(sat) < 450mV at 3A. It serves as a high-current switching element in battery-powered DC-DC converters and flash gun circuits, replacing Darlington pairs where low saturation voltage and thermal robustness are critical.
For engineers reviewing the FZT689BTC datasheet, FZT689BTC pinout, FZT689BTC application, or FZT689BTC equivalent, key selection criteria include verified VCEO = 20V, IC = 3A continuous rating, RθJA = 41.7°C/W (on 50mm × 50mm 2oz Cu), JEDEC-compliant HBM ESD rating of 4kV, and complementary PNP pairing with FZT789B.
Technical Context
This NPN bipolar junction transistor operates in linear or saturated switching mode with guaranteed BVCEO ≥ 20V and BVCBO ≥ 20V, supporting reliable operation in 12–20V rail systems. Its fT = 150MHz enables use in moderate-speed switching applications up to several hundred kHz.
Thermal performance is defined across four mounting conditions: RθJA ranges from 41.7°C/W (full copper pad) to 104°C/W (minimum pad layout), and RθJL = 12.9°C/W confirms efficient heat conduction through the collector lead-critical for sustained 3A operation without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 20 V - Maximum allowable collector-emitter voltage before breakdown; defines safe operating range in 12V/20V automotive and industrial supplies. |
| IC (cont.) | 3 A - Continuous collector current rating; supports high-side load switching or power stage drivers without derating at +25°C ambient. |
| hFE | 400 @ 2A - DC current gain at high current; ensures stable base drive requirements for efficient saturation in power switching. |
| VCE(sat) | < 450 mV @ 3A - Low saturation voltage minimizes conduction loss (P = I×V) and self-heating in battery-powered circuits. |
| fT | 150 MHz - Current gain-bandwidth product; validates suitability for pulse-width modulated (PWM) control up to ~100kHz with margin. |
| ESD HBM | 4,000 V - Human Body Model rating per JESD22-A114; provides robustness during manual handling and board assembly. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, thermally enhanced plastic package with exposed collector tab for direct PCB heat sinking. Molded compound is halogen- and antimony-free ("Green"), UL 94V-0 rated, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current-carrying terminal, connected to exposed tab | Primary thermal path to PCB; must be soldered to ≥25 mm² copper area for rated 3A operation. |
| Emitter (E) | Current return path, common reference node | Low-impedance ground connection point; used as fixed reference in emitter-follower or switch configurations. |
| Base (B) | Control input for transistor biasing | Requires ~20mA drive for full saturation at 3A; compatible with standard logic-level or microcontroller GPIO outputs via series resistor. |
Key Features
| Feature | Design Value |
|---|---|
| High current capability | 3A continuous collector current with validated thermal derating curves up to +150°C junction temperature. |
| Low saturation loss | VCE(sat) ≤ 450mV at 3A enables <1.4W conduction loss-critical for efficiency in portable power converters. |
| Complementary pairing | Direct match with FZT789B PNP for push-pull, H-bridge, or differential amplifier topologies without redesign. |
| Automotive-ready construction | Manufactured in IATF 16949-certified facilities; RoHS 3 compliant and halogen-free per Diodes' "Green" definition. |
Applications
| Flash Gun Converters | Battery-Powered DC-DC Stages |
|---|---|
Use Scenario: High-voltage capacitor charging circuit in portable camera flash units powered by 2–4 AA cells. IC Role / Device Role / Timing Role: NPN switch controlling primary-side current into step-up transformer; driven by PWM controller at ~20–50kHz. Use Value: Low VCE(sat) reduces battery drain during repeated flash cycles; 3A rating supports fast charge times under cold-temperature battery conditions. | Use Scenario: Synchronous rectifier or main switch in 5–12V input, 3.3–5V output buck converters for handheld test equipment. IC Role / Device Role / Timing Role: Power switch in non-isolated buck topology; operated in hard-switched mode below 200kHz. Use Value: 150MHz fT ensures clean turn-on/turn-off edges; RθJL = 12.9°C/W allows direct thermal coupling to ground plane without heatsink. |
| Darlington Replacement | Industrial Sensor Interface Drivers |
Use Scenario: Direct replacement for legacy Darlington transistors (e.g., MPSA13) in PLC output modules driving 24V solenoids. IC Role / Device Role / Timing Role: Single-transistor high-gain switch eliminating base-resistor networks and secondary transistor stages. Use Value: hFE > 400 at 2A eliminates need for Darlington's cascaded gain, reducing component count and improving reliability over temperature. | Use Scenario: Output driver for 4–20mA current-loop transmitters in factory automation sensors. IC Role / Device Role / Timing Role: Constant-current source transistor in two-wire loop configuration, biased in linear region. Use Value: Tight VBE(on) tolerance (≤0.9V) and stable hFE enable accurate 20mA regulation across -40°C to +85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN2020ZTA | Higher VCEO = 25V, lower IC = 2.5A, SOT89 package (RθJA = 62.5°C/W) | Limited to lower-current 24V industrial controls; no complementary PNP pairing available | Select when higher breakdown margin is needed but thermal budget permits reduced current or larger footprint. |
| MJD127G | Same SOT223, IC = 3A, but VCEO = 100V and hFE = 25–250 (wide spread) | Suitable for high-voltage flyback snubbers or relay drivers, not optimized for low-VCE(sat) efficiency | Choose only when 100V rating is mandatory; avoid where consistent hFE and low saturation are required. |
Compared with ZXTN2020ZTA and MJD127G, FZT689BTC delivers superior balance of low-loss switching (450mV @ 3A), tight hFE distribution (400–1500), and native complementary pairing-making it optimal for cost-sensitive, thermally constrained 20V power stages.
Availability
FZT689BTC is available at Aetrix Electronics and suitable for flash gun converters, battery-powered DC-DC stages, Darlington replacements, and industrial sensor interface drivers requiring stable component supply and long-term production continuity.
Supply support for FZT689BTC 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 North America.
FZT689BTC belongs to Diodes' high-reliability power transistor product line, engineered specifically for efficiency-critical, medium-current switching in portable, automotive, and industrial power systems.
FAQ
What is the maximum junction temperature and how does it affect continuous current rating?
The FZT689BTC has a TJ(max) of +150°C and TSTG range of –55°C to +150°C. At TA = +25°C with 50mm × 50mm 2oz Cu PCB, its 3A rating is valid up to +75°C ambient; above that, current must be linearly derated using the published curve (1.2A/W slope beyond 75°C). Thermal resistance values are measured per JEDEC standards.
Is FZT689BTC qualified for automotive applications?
FZT689BTC is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, Diodes offers automotive-grade variants (e.g., FZT689BQ) with full AEC-Q101 stress testing and change control-contact Diodes or Aetrix for qualification path support.
How does the SOT223 pinout differ between FZT689BTC and FZT789B?
FZT689BTC (NPN) and FZT789B (PNP) share identical SOT223 (Type DN) mechanical outline and pin assignment: Collector (tab), Emitter, Base in left-to-right order on top view. This symmetry enables direct PCB layout reuse in complementary designs without routing changes.
Can FZT689BTC be used in linear regulator pass transistor applications?
Yes-its VCEO = 20V, hFE stability up to IC = 2A, and low VCE(sat) support use as a series pass element in adjustable linear regulators. However, power dissipation must be limited to ≤1.2W (per minimum pad layout derating) and thermal design must account for RθJA = 104°C/W in that configuration.
FZT689BTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 20 V
- Vce Saturation (Max) @ Ib, Ic:
- 450mV @ 20mA, 3A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 400 @ 2A, 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-223-3
FZT689BTC FAQ
1.How can I place an order for FZT689BTC through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT689BTC 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 FZT689BTC reliable?
The price and inventory of FZT689BTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT689BTC is usually 5 days.
3.What payment methods are accepted for FZT689BTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT689BTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT689BTC?
FZT689BTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT689BTC 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 FZT689BTC?
For technical support, including FZT689BTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT689BTC requirements.
6.How does Aetrix verify that FZT689BTC is sourced from the original manufacturer or authorized distributors?
All FZT689BTC 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 FZT689BTC meets industry standards.
7.What is the process for return or replacement of FZT689BTC?
All FZT689BTC units undergo pre-shipment inspection (PSI). If there is an issue with FZT689BTC, 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 FZT689BTC part is unused and in its original packaging.
Return procedure for FZT689BTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FZT689BTC Tags
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Diodes Incorporated
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