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Diodes Incorporated FZT790ATA
- Part No.:
- FZT790ATA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT790ATA.pdf
- Description:
- TRANS PNP 40V 3A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,422
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Product details
Overview
FZT790ATA from Diodes Incorporated is a 40V PNP medium-power transistor in SOT223 package, rated for -3A continuous collector current and -6A peak pulse current, with VCE(sat) of 0.15V at -500mA/-5mA drive and hFE = 200 at -1A/-2V, used in DC-DC converter switching stages and siren driver output stages.
For engineers reviewing the FZT790ATA datasheet, FZT790ATA pinout, FZT790ATA application, or FZT790ATA equivalent, key selection criteria include verified PNP polarity, SOT223 thermal performance (RθJA = 41.7°C/W on 50mm × 50mm 2oz copper), low saturation voltage under high-current switching, and automotive-grade packaging compliance (RoHS, halogen-free, MSL Level 1).
Technical Context
This PNP bipolar junction transistor operates as a medium-power switch with complementary pairing to the NPN FZT690B. Its BVCEO = -40V and VBE(sat) = -0.8V at -1A/-10mA enable robust operation in negative-rail switching topologies.
Thermal design relies on its RθJL = 12.9°C/W junction-to-lead path and defined derating curves across PCB copper area variants. ESD ratings meet JEDEC HBM Class 3A (4kV) and MM (400V), supporting industrial handling environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -40V - Maximum reverse-biased collector-emitter voltage before breakdown; defines safe operating range in high-side PNP switch configurations. |
| IC Continuous | -3A - Sustained collector current capability; supports DC-DC converter output stage loads without forced cooling. |
| VCE(sat) | 0.15V @ -500mA/-5mA - Low conduction loss during saturation; reduces power dissipation and improves efficiency in switching applications. |
| hFE | 200 @ -1A/-2V - Current gain sufficient for direct microcontroller GPIO drive without external base amplification. |
| RθJA | 41.7°C/W - Thermal resistance on 50mm × 50mm 2oz copper; enables 3W power dissipation at ≤75°C ambient with 25°C rise margin. |
| fT | 100MHz - Transition frequency confirming suitability for switching frequencies up to ~10MHz with adequate gain margin. |
| ESD HBM | 4000V - Human Body Model rating ensures robustness against common electrostatic discharge events during board assembly. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount plastic package with exposed collector tab for thermal conduction and mechanical anchoring. Molded compound meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Connected to positive rail in high-side switch; carries full load current and sets reference for base drive polarity. |
| 2 (Base) | Control input | Receives negative-going logic signal or active-low drive; requires current-limiting resistor to set IB for target IC. |
| 3 (Collector) | Output/switch node | Connected to load and ground return path; electrically and thermally tied to large copper pour via exposed metal tab. |
| 4 (Collector Tab) | Collector extension | Integral thermal and electrical connection to collector; must be soldered to ≥25mm² copper area for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | 0.15V at -500mA ensures <75mW conduction loss per switch cycle, critical for thermal management in compact DC-DC modules. |
| High hFE | 200 at -1A allows direct drive from 3.3V/5V microcontrollers with ≤10mA base current, eliminating need for Darlington or MOSFET gate drivers. |
| SOT223 thermal performance | RθJL = 12.9°C/W enables >2W dissipation with minimal heatsinking when collector tab is properly mounted to PCB copper. |
| Automotive-ready construction | Halogen- and antimony-free "Green" compound, RoHS 3 compliant, and MSL Level 1 moisture sensitivity support reflow compatibility and long-term reliability in automotive ECUs. |
Applications
| DC-DC Converter Output Stage | Siren Driver Output Stage |
|---|---|
Use Scenario: High-efficiency buck converter output switch in 12V-to-5V/3.3V power supplies for industrial controllers. IC Role / Device Role / Timing Role: PNP high-side switch controlling current flow from input rail to inductor; operates in saturated switching mode at 100–500kHz. Use Value: Low VCE(sat) minimizes conduction loss while high hFE simplifies gate-drive circuitry, reducing BOM count and layout area. |
Use Scenario: Audio-frequency power amplifier driving electromechanical sirens in fire alarm panels and security systems. IC Role / Device Role / Timing Role: Class-B output stage switch delivering pulsed 2A peak current into 8Ω load at 1–3kHz tone frequencies. Use Value: -6A ICM withstands repetitive surge currents during siren activation; rugged ESD rating prevents field failure during installation. |
| Automotive Body Control Module | Industrial Relay Driver |
Use Scenario: Load switch for interior lighting and window motor control in AEC-Q200-aligned body electronics. IC Role / Device Role / Timing Role: PNP driver interfacing MCU GPIO to 12V loads; operated with PWM dimming or on/off control. Use Value: Complementary pairing with FZT690B enables push-pull output stages; RoHS/halogen-free compliance meets OEM material declarations. |
Use Scenario: Solid-state replacement for electromagnetic relays in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: Medium-power load switch isolating 24V DC control signals from solenoid/valve actuation circuits. Use Value: -40V VCEO provides 2× safety margin over 24V nominal rails; SOT223 footprint allows direct drop-in replacement of TO-220 relays in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD2955T4G | TO-220 package, higher RθJA (65°C/W), VCE(sat) = 1.2V @ -4A - significantly higher conduction loss. | Requires heatsink for >1.5A operation; unsuitable for SMT-only designs due to through-hole mounting. | Select only when legacy TO-220 footprint or higher surge current (ICM = -12A) is mandatory. |
| FZT690B | NPN complement; identical SOT223 package, matching hFE and VCE(sat), but opposite polarity and voltage polarity requirements. | Used in low-side switching or complementary push-pull outputs; not interchangeable without circuit redesign. | Choose for NPN-based topologies or dual-transistor bridge configurations requiring matched characteristics. |
Compared with MJD2955T4G, FZT790ATA offers superior thermal efficiency and SMT compatibility; versus FZT690B, it enables high-side switching where NPN devices require level-shifting drive circuitry.
Availability
FZT790ATA is available at Aetrix Electronics and suitable for DC-DC converters, siren drivers, and automotive body control modules requiring stable component supply, RoHS-compliant manufacturing, and SOT223 thermal performance.
Supply support for FZT790ATA 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.
FZT790ATA belongs to Diodes' FZT series of medium-power transistors engineered for high-reliability industrial and automotive power switching, emphasizing low saturation voltage, thermal robustness, and green material compliance.
FAQ
What is the maximum continuous collector current for FZT790ATA?
The FZT790ATA is rated for -3A continuous collector current at TA = +25°C with proper PCB thermal management (50mm × 50mm 2oz copper). Derating applies above +25°C ambient, reaching zero current at +150°C junction temperature per the published thermal curve.
Can FZT790ATA replace a TO-92 transistor in existing designs?
No - FZT790ATA uses SOT223, which has different footprint, thermal path, and pinout than TO-92. Its exposed collector tab requires dedicated copper pour and cannot be substituted without PCB revision. Electrical parameters also differ significantly from typical TO-92 PNP devices like BC557.
Is FZT790ATA qualified for automotive applications?
FZT790ATA is not AEC-Q101 qualified out-of-box, but Diodes offers automotive-grade variants (e.g., FZT790AMTA) with PPAP documentation and IATF 16949 manufacturing. Standard FZT790ATA meets RoHS, halogen-free, and MSL Level 1 requirements applicable to many non-safety-critical automotive subsystems.
What is the recommended base resistor value for driving FZT790ATA with a 3.3V microcontroller?
For reliable saturation at IC = -1A, hFE = 200 implies IB ≥ 5mA. With VBE(sat) ≈ -0.8V, a 510Ω resistor limits base current to ~4.9mA from 3.3V. Use 470Ω for margin. Ensure MCU GPIO can source this current continuously.
FZT790ATA 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:
- PNP
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 750mV @ 50mA, 2A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 10mA, 2V
- Power - Max:
- 2 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT790ATA FAQ
1.How can I place an order for FZT790ATA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT790ATA 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 FZT790ATA reliable?
The price and inventory of FZT790ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT790ATA is usually 5 days.
3.What payment methods are accepted for FZT790ATA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT790ATA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT790ATA?
FZT790ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT790ATA 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 FZT790ATA?
For technical support, including FZT790ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT790ATA requirements.
6.How does Aetrix verify that FZT790ATA is sourced from the original manufacturer or authorized distributors?
All FZT790ATA 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 FZT790ATA meets industry standards.
7.What is the process for return or replacement of FZT790ATA?
All FZT790ATA units undergo pre-shipment inspection (PSI). If there is an issue with FZT790ATA, 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 FZT790ATA part is unused and in its original packaging.
Return procedure for FZT790ATA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FZT790ATA Tags
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