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Diodes Incorporated FZT591AQTA
- Part No.:
- FZT591AQTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT591AQTA.pdf
- Description:
- TRANS PNP 40V 1A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
FZT591AQTA from Diodes Incorporated is a 40V PNP medium-power transistor in SOT223 package, rated for -1A continuous collector current and featuring VCE(SAT) < -500mV at -1A. It is AEC-Q101 qualified, RoHS-compliant, and designed for high-reliability automotive gate driving and low-loss power switching applications.
For engineers reviewing the FZT591AQTA datasheet, FZT591AQTA pinout, FZT591AQTA application, or FZT591AQTA equivalent, key selection criteria include its -40V VCEO, thermal resistance of 41.7°C/W (on 50mm × 50mm PCB), complementary pairing with FZT491A, and suitability for MOSFET/IGBT gate drive stages requiring robust saturation and fast switching.
Technical Context
This PNP bipolar junction transistor operates in linear or saturated switching mode, with guaranteed BVCEO = -40V and VBE(SAT) = -1.1V at -1A/-50mA. Its fT = 150MHz supports moderate-frequency switching up to several MHz in driver circuits.
The device uses a thermally enhanced SOT223 (Type DN) package with exposed collector lead, enabling RθJL = 19.4°C/W and supporting 3W dissipation on large copper areas - critical for sustained gate-drive pulse trains in automotive power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -40V - Ensures safe operation with 24V automotive rails plus transient spikes. |
| IC (continuous) | -1A - Supports direct drive of medium-current IGBT/MOSFET gates without external buffering. |
| VCE(SAT) | < -500mV @ -1A/-100mA - Minimizes conduction loss and self-heating during active pull-down. |
| hFE | 30–800 (varies with IC) - Enables stable DC biasing across load range; ≥160 at -500mA ensures reliable saturation. |
| fT | 150MHz - Permits clean edge control in PWM frequencies up to ~1–2MHz with adequate gain margin. |
| RθJA | 41.7°C/W (50mm×50mm 2oz Cu) - Defines maximum ambient temperature rise under full 3W dissipation in production PCB layout. |
| ESD HBM | 8,000V - Meets stringent handling requirements for automotive assembly environments. |
Pinout & Package
SOT223 (Type DN) package with exposed collector tab for thermal conduction and mechanical anchoring. Molded green compound, UL 94V-0 rated, 0.112g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current source terminal | Connected to positive rail in high-side switch configurations; requires low-impedance return path. |
| Base (B) | Control input | Driven by logic-level or buffered signal; requires series resistor to limit IB ≤ -100mA for full saturation. |
| Collector (C) | Output/load connection | Exposed metal tab - must be soldered to ≥25mm² copper pour for thermal performance and EMI reduction. |
| Tab / Collector Pad | Thermal & electrical node | Electrically tied to collector; serves as primary heat path to PCB; not isolated. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood use (-40°C to +150°C TJ), including temperature cycling and HTRB stress. |
| Low VCE(SAT) at high IC | Guaranteed ≤ -500mV at -1A enables >95% efficiency in gate discharge paths with minimal voltage drop. |
| Complementary NPN pairing | FZT491A shares identical SOT223 footprint and thermal profile - simplifies dual-driver PCB layout and BOM consolidation. |
| Halogen- and antimony-free "Green" construction | Meets EU RoHS 3 and automotive material compliance standards (<900ppm Br/Cl, <1000ppm Sb). |
Applications
| Automotive Gate Driver | Industrial Power Switch |
|---|---|
Use Scenario: Driving the gate of a 600V IGBT in an automotive HVAC blower inverter. IC Role / Device Role / Timing Role: PNP pull-down stage providing fast, low-loss turn-off of the IGBT gate during PWM dead-time intervals. Use Value: VCE(SAT) < -500mV minimizes gate discharge energy loss and prevents shoot-through risk during high-frequency switching. | Use Scenario: Controlling a 48V DC bus enable switch in industrial PLC output modules. IC Role / Device Role / Timing Role: Medium-power PNP switch regulating power delivery to downstream loads via base-controlled saturation. Use Value: 3W power rating with 41.7°C/W RθJA allows continuous operation at 1A without heatsink in compact enclosures. |
| DC-DC Converter Bias Supply | High-Reliability Relay Driver |
Use Scenario: Providing regulated bias current to error amplifier and reference circuitry in an isolated flyback controller. IC Role / Device Role / Timing Role: Linear-regulator pass element delivering stable -15V @ 100mA with low dropout and ripple rejection. Use Value: hFE ≥ 300 at low IC ensures precise current mirroring and tight regulation stability over temperature. | Use Scenario: Driving electromagnetic relays in railway signaling systems requiring long-term reliability. IC Role / Device Role / Timing Role: High-current interface between microcontroller GPIO and relay coil (e.g., 24V/500mA). Use Value: 8kV HBM ESD rating and AEC-Q101 qualification ensure immunity to field-induced transients and extended service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25050DFHTA | Higher VCEO (-50V), lower RθJA (35°C/W), but SOT23 package limits IC to -500mA. | Not suitable for -1A continuous loads; better for space-constrained, lower-current drivers. | Select when board area is critical and peak current ≤500mA. |
| MJD44H11RLG | TO-220 package, higher IC (-8A), but larger footprint and no AEC-Q101 qualification. | Requires heatsink for >1A; lacks automotive qualification and green compliance. | Select only for non-automotive, high-current linear switching where thermal mass is available. |
Compared with ZXTN25050DFHTA and MJD44H11RLG, FZT591AQTA uniquely balances AEC-Q101 compliance, -1A capability, SOT223 thermal performance, and RoHS/Green requirements - making it optimal for space- and reliability-constrained automotive gate drivers.
Availability
FZT591AQTA is available at Aetrix Electronics and suitable for automotive gate driving, industrial power switching, DC-DC bias supplies, and high-reliability relay control requiring stable component supply and traceable sourcing.
Supply support for FZT591AQTA 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, industry-qualified components for automotive, industrial, and computing markets.
FZT591AQTA belongs to Diodes' AEC-Q101-qualified bipolar transistor product line, engineered specifically for robust gate-driving and power-switching roles in harsh-environment automotive subsystems.
FAQ
What is the maximum allowable junction temperature for FZT591AQTA?
The absolute maximum operating junction temperature is +150°C, with storage range extending from -55°C to +150°C. Derating begins above +25°C ambient per the published thermal curves - at 100°C ambient, maximum continuous power drops to ~1.2W on a 50mm × 50mm 2oz copper PCB.
Can FZT591AQTA be used in parallel for higher current handling?
No - bipolar transistors exhibit negative temperature coefficient of VBE, causing current hogging when paralleled without individual emitter resistors. For >1A applications, use a single higher-rated device or implement forced current sharing with matched emitter degeneration resistors.
Is the collector tab electrically isolated from other pins?
No - the exposed collector tab is internally bonded to the collector terminal and is not insulated. It must be treated as a live, high-current node and electrically connected only to the collector net and associated thermal copper pour.
How does FZT591AQTA differ from the standard FZT591ATA?
FZT591AQTA is the automotive-grade variant: both share identical electrical specs and packaging, but FZT591AQTA carries explicit "Automotive" marking, full PPAP documentation support, and guaranteed lot-level AEC-Q101 test reports - whereas FZT591ATA is standard-qualification with same reliability but no automotive-specific certification paperwork.
FZT591AQTA 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):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 100mA, 5V
- Power - Max:
- 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-223-3
FZT591AQTA FAQ
1.How can I place an order for FZT591AQTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT591AQTA 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 FZT591AQTA reliable?
The price and inventory of FZT591AQTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT591AQTA is usually 5 days.
3.What payment methods are accepted for FZT591AQTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT591AQTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT591AQTA?
FZT591AQTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT591AQTA 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 FZT591AQTA?
For technical support, including FZT591AQTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT591AQTA requirements.
6.How does Aetrix verify that FZT591AQTA is sourced from the original manufacturer or authorized distributors?
All FZT591AQTA 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 FZT591AQTA meets industry standards.
7.What is the process for return or replacement of FZT591AQTA?
All FZT591AQTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT591AQTA, 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 FZT591AQTA part is unused and in its original packaging.
Return procedure for FZT591AQTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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