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Diodes Incorporated FZT689BTA
- Part No.:
- FZT689BTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT689BTA.pdf
- Description:
- TRANS NPN 20V 3A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:33,981
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Product details
Overview
FZT689BTA 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.
For engineers reviewing the FZT689BTA datasheet, FZT689BTA pinout, FZT689BTA application, or FZT689BTA equivalent, key selection criteria include its 20V BVCEO rating, low saturation voltage under high current, thermal resistance of 41.7°C/W on 50mm × 50mm 2oz copper, and complementary PNP pairing with FZT789B.
Technical Context
This NPN bipolar junction transistor operates in linear or saturated switching mode with guaranteed breakdown voltages of 20V (VCBO and VCEO) and 7V (VEBO). Its high DC current gain (hFE = 500 min at 0.1A, 400 typ at 2A) supports efficient base drive in medium-power amplification and switching stages.
The device delivers 150MHz fT at 5V VCE and 50mA IC, enabling use in medium-frequency switching applications up to several hundred kHz. Its 4000V HBM ESD rating and RoHS-compliant, halogen-free "Green" construction meet automotive-grade reliability requirements when qualified per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Collector-Emitter Voltage (VCEO) | 20 V - Supports operation in 12V/15V rail systems with margin against transients |
| Continuous Collector Current (IC) | 3.0 A - Enables direct drive of moderate-power loads without external current boosting |
| VCE(sat) @ 3A/20mA | < 450 mV - Limits conduction loss to < 1.35W at full rated current |
| DC Current Gain (hFE) | 400 @ 2A - Ensures stable saturation with modest base drive (IB = 5–10mA typical) |
| Thermal Resistance (RθJA) | 41.7 °C/W - Requires ≥50mm × 50mm 2oz copper pad for full 3W dissipation at TA = +25°C |
| fT (Current Gain-Bandwidth) | 150 MHz - Suitable for PWM switching up to ~200kHz with minimal phase lag |
| ESD Rating (HBM) | 4000 V - Reduces risk of handling damage during PCB assembly |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin configuration with collector tab (pin 3) electrically connected to lead frame for thermal and electrical continuity. Molded plastic body with matte tin-plated leads, UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | E | Reference node for base-emitter junction; connects to ground or low-side return path |
| Pin 2 (Base) | B | Control input requiring ~0.7–0.9V forward bias and ~10mA drive for full saturation at 3A |
| Pin 3 (Collector) | C | Main power output terminal; thermally coupled to exposed copper pad for heat sinking |
| Pin 4 (Collector Tab) | C (internally tied) | Integral thermal and electrical extension of collector; must be soldered to PCB copper for RθJA compliance |
Key Features
| Feature | Design Value |
|---|---|
| High hFE at high current | hFE ≥ 400 @ IC = 2A - Reduces required base drive current and driver-stage complexity |
| Low VCE(sat) at 3A | < 450 mV - Minimizes conduction losses in battery-powered switching applications |
| Complementary PNP pairing | FZT789B listed as direct complement - Enables matched Darlington or push-pull stage design |
| Automotive-qualified option | AEC-Q101 capable with PPAP support - Meets change control and traceability requirements for automotive electronics |
| Halogen- and antimony-free | <900 ppm Br/Cl, <1000 ppm Sb - Complies with EU "Green" material directives and end-of-life recycling standards |
Applications
| LED Flash Driver | Battery-Powered DC-DC Converter |
|---|---|
Use Scenario: High-intensity camera flash circuit powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: NPN switch controlling flash LED current path; driven by microcontroller GPIO or dedicated flash controller. Use Value: Low VCE(sat) ensures >95% efficiency at 2–3A pulse current, extending battery life per flash cycle. | Use Scenario: Step-up converter in portable medical monitor powering 5V logic rails from 3.3V battery source. IC Role / Device Role / Timing Role: Main switching transistor in discrete boost topology operating at 100–300kHz. Use Value: 150MHz fT and fast turn-on/off times (30ns/800ns) support stable regulation at high switching frequencies. |
| Darlington Pair Input Stage | Industrial Sensor Interface |
Use Scenario: Input buffer stage in programmable logic controller (PLC) digital input module accepting 24V DC field signals. IC Role / Device Role / Timing Role: First-stage NPN amplifier in Darlington configuration with FZT789B complement. Use Value: High hFE (>400 at 2A) enables robust current gain with minimal base current draw from optocoupler output. | Use Scenario: Signal conditioning front-end for 4–20mA loop-powered industrial pressure sensor. IC Role / Device Role / Timing Role: Active current sink transistor regulating loop current under microcontroller DAC control. Use Value: 20V VCEO and 7V VEBO ratings provide margin against line transients and reverse polarity events in harsh environments. |
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 |
|---|---|---|---|
| ZXTN2012E6TA | Higher VCEO (30V), lower hFE (200 min @ 2A), SOT23-3 package | Lower current rating (1.2A), unsuitable for 3A continuous loads | Select only if voltage headroom >30V is critical and current demand ≤1.2A |
| MJD127G | TO-220 package, higher PD (25W), same VCEO (20V), hFE = 1000 min @ 1A | Requires heatsink; incompatible footprint; better for high-power linear regulation | Choose when thermal budget exceeds SOT223 capability and board space allows TO-220 mounting |
Compared with ZXTN2012E6TA and MJD127G, FZT689BTA uniquely balances 3A current capability, SOT223 surface-mount compatibility, and low-saturation performance-making it optimal for space-constrained, medium-power switching where thermal management relies on PCB copper rather than external heatsinks.
Availability
FZT689BTA is available at Aetrix Electronics and suitable for LED flash drivers, battery-powered DC-DC converters, and industrial sensor interfaces requiring stable component supply and long-term production continuity.
Supply support for FZT689BTA 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.
FZT689BTA belongs to Diodes' FZT series of medium-power transistors engineered for high-current switching in compact surface-mount packages, targeting portable, automotive, and industrial power management applications.
FAQ
What is the maximum safe operating temperature for FZT689BTA?
The junction temperature range is –55°C to +150°C. For reliable long-term operation, keep TJ ≤ 125°C under steady-state conditions. With RθJA = 41.7°C/W on 50mm × 50mm 2oz copper, ambient temperature must stay below 85°C when dissipating 3W continuously.
Is FZT689BTA pin-compatible with other SOT223 NPN transistors?
No universal pin compatibility exists across SOT223 NPN transistors. FZT689BTA uses the standard Type DN pinout (E-B-C-tab), but functional equivalence requires verification of VCEO, hFE, and VCE(sat) at target operating current-not just package alignment.
Can FZT689BTA replace a Darlington pair in existing designs?
Yes-it is explicitly recommended for Darlington replacements. Its high hFE (≥400 at 2A) and low VCE(sat) reduce base drive requirements and conduction loss compared to conventional Darlington configurations, simplifying driver circuitry and improving efficiency.
Does FZT689BTA require a heatsink in typical applications?
Not for most applications: the SOT223 package achieves RθJA = 41.7°C/W when mounted on ≥50mm × 50mm 2oz copper. Heatsinking is unnecessary unless continuous power dissipation exceeds 1.5W at ambient >70°C or derating curves indicate insufficient margin.
FZT689BTA 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):
- 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
FZT689BTA FAQ
1.How can I place an order for FZT689BTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT689BTA 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 FZT689BTA reliable?
The price and inventory of FZT689BTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT689BTA is usually 5 days.
3.What payment methods are accepted for FZT689BTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT689BTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT689BTA?
FZT689BTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT689BTA 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 FZT689BTA?
For technical support, including FZT689BTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT689BTA requirements.
6.How does Aetrix verify that FZT689BTA is sourced from the original manufacturer or authorized distributors?
All FZT689BTA 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 FZT689BTA meets industry standards.
7.What is the process for return or replacement of FZT689BTA?
All FZT689BTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT689BTA, 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 FZT689BTA part is unused and in its original packaging.
Return procedure for FZT689BTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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