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Diodes Incorporated FZT758TC
- Part No.:
- FZT758TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT758TC.pdf
- Description:
- TRANS PNP 400V 0.5A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,637
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Product details
Overview
FZT758TC from Diodes Incorporated is a 400V PNP high-voltage bipolar junction transistor in SOT223 package, rated for -500mA continuous collector current and -400V VCEO. It delivers low saturation voltage (VCE(sat) < -250mV @ -50mA), high DC current gain (hFE > 40 up to -200mA), and supports peak pulse current of -1A - enabling use in high-voltage flyback snubber circuits and industrial power supply hold-up stages.
For engineers reviewing the FZT758TC datasheet, FZT758TC pinout, FZT758TC application, or FZT758TC equivalent, key selection criteria include verified -400V breakdown rating, SOT223 thermal performance (RθJA = 41.7°C/W on 50mm × 50mm 2oz copper), complementary pairing with FZT658, and automotive-qualified variants (FZT758TA) for AEC-Q101-compliant designs.
Technical Context
This PNP transistor operates in linear and switching modes with guaranteed VCEO and VCBO ratings of -400V, supporting high-side switching in off-line AC/DC converters where reverse-biased emitter-base junctions must withstand >6V. Its fT of 50MHz enables stable operation in fast-switching auxiliary supplies.
Thermal design is constrained by RθJL = 12.9°C/W (junction-to-lead), requiring direct thermal coupling of the collector tab to PCB copper. ESD robustness includes 4kV HBM and 400V MM ratings, validated per JEDEC JESD22-A114/A115.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -400V - Enables direct use in 380V DC bus clamp and flyback reset circuits without series stacking. |
| IC (cont.) | -500mA - Supports sustained current in high-voltage bias rails and relay drivers with minimal derating at +100°C ambient. |
| VCE(sat) | < -250mV @ -50mA - Reduces conduction loss in active-clamp and hold-up switch applications below 0.5W dissipation. |
| hFE | >40 @ -200mA - Ensures reliable base drive margin in discrete gate driver stages with limited IB sourcing capability. |
| fT | 50MHz - Validates usable bandwidth for <100ns switching transitions in auxiliary SMPS feedback paths. |
| RθJA | 41.7°C/W (50mm×50mm 2oz Cu) - Defines minimum PCB copper area needed to maintain TJ < 150°C at 2W dissipation. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, thermally enhanced with exposed collector tab. Molded green compound (UL 94V-0), matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (Tab) | Main current sink path and thermal interface | Exposed metal tab must be soldered to ≥50mm² 2oz copper for rated 3.0W dissipation; electrically connected to collector. |
| Emitter | Current source terminal in PNP configuration | Connected to higher potential rail; reverse-biased VEBO = -7V limits base-emitter voltage swing in active mode. |
| Base | Control input for minority-carrier injection | Requires negative current relative to emitter; VBE(on) ≈ -1.0V @ -100mA defines minimum drive compliance voltage. |
Key Features
| Feature | Design Value |
|---|---|
| High voltage blocking | Guaranteed -400V VCEO and VCBO ensures reliability in 380V DC link clamping without derating. |
| High-current capability | -500mA continuous rating supports industrial solenoid and relay drivers without external heat sinking. |
| Low saturation loss | VCE(sat) < -250mV at -50mA reduces power loss to <12.5mW in bias supply regulation. |
| Automotive-ready variant | FZT758TA meets AEC-Q101 stress testing and is manufactured in IATF 16949-certified facilities. |
Applications
| Industrial Power Supply Hold-Up | Off-Line Flyback Snubber |
|---|---|
Use Scenario: Maintaining regulated output during brief AC line dropouts in 24V/48V industrial PSUs. IC Role / Device Role / Timing Role: PNP high-side switch controlling charge/discharge of hold-up capacitor via base-driven turn-on. Use Value: -400V rating allows direct connection to 380V DC bus; low VCE(sat) minimizes standby loss during capacitor recharge. |
Use Scenario: Absorbing leakage inductance energy in 65–100kHz flyback transformers. IC Role / Device Role / Timing Role: Active clamp transistor synchronized with primary MOSFET turn-off to recycle energy. Use Value: 50MHz fT supports clean turn-on within 100ns window; -1A ICM handles transient spikes without secondary breakdown. |
| High-Voltage Relay Driver | AC/DC Auxiliary Bias Supply |
Use Scenario: Driving 125V/250V coil relays in programmable logic controllers and motor starters. IC Role / Device Role / Timing Role: High-side PNP switch interfacing microcontroller GPIO to relay coil with inverted logic control. Use Value: -400V VCEO withstands inductive kickback exceeding 200V; hFE >40 ensures single-stage drive from 3.3V MCU. |
Use Scenario: Generating isolated +15V/-15V bias for gate drivers in three-phase inverters. IC Role / Device Role / Timing Role: Discrete pass transistor regulating unregulated winding output in multi-output flyback. Use Value: RθJL = 12.9°C/W enables direct tab-to-copper thermal path; -500mA IC supports 100mA load with 25°C rise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSS12201CF8T1G | VCEO = -120V, IC = -200mA, SOT-23 package | Limited to sub-100V systems; unsuitable for 380V bus clamping or relay driving above 60V. | Select only for space-constrained low-voltage bias rails where thermal mass is managed externally. |
| STMicroelectronics STN93020 | VCEO = -400V, IC = -300mA, SOT-223, hFE min = 25 @ -150mA | Lower current gain and reduced IC limit constrain base drive margin and continuous power handling. | Acceptable for lower-current snubbers but requires larger base drive and derates faster above 85°C ambient. |
Compared with NSS12201CF8T1G and STN93020, FZT758TC uniquely combines -400V rating, -500mA current, and hFE >40 at high current - making it the only option among the three qualified for 380V industrial hold-up and relay driver designs without parallel devices or forced cooling.
Availability
FZT758TC is available at Aetrix Electronics and suitable for industrial power supply hold-up, off-line flyback snubber circuits, and high-voltage relay drivers requiring stable component supply across extended production lifecycles.
Supply support for FZT758TC 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 the Americas.
FZT758TC belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for industrial and automotive power conversion systems demanding ruggedized PNP switching with guaranteed -400V breakdown and thermal reliability in SOT223.
FAQ
What is the maximum allowable junction temperature for FZT758TC?
The absolute maximum junction temperature is +150°C, with storage temperature range also specified from -55°C to +150°C. Operation above this limit risks permanent degradation of hFE, increased leakage, and accelerated metallization failure. Thermal design must ensure TJ remains ≤150°C under worst-case ambient, power dissipation, and PCB copper conditions.
Is FZT758TC pin-compatible with its NPN complement FZT658?
No - FZT758TC (PNP) and FZT658 (NPN) share identical SOT223 package dimensions and pinout order (Emitter-Base-Collector with tab as Collector), but their polarity and biasing requirements are opposite. They are functionally complementary, not pin-swappable; substituting one for the other without circuit redesign will result in non-functional or destructive operation.
Does FZT758TC meet AEC-Q101 qualification?
The FZT758TC variant is not AEC-Q101 qualified. However, the FZT758TA part number - identical electrically and mechanically but manufactured under automotive change control in IATF 16949-certified facilities - is AEC-Q101 qualified and PPAP-capable. Customers requiring automotive qualification must specify FZT758TA, not FZT758TC.
How does the SOT223 collector tab affect PCB layout?
The exposed collector tab must be soldered to a dedicated thermal pad connected to ≥50mm² of 2oz copper for full 3.0W power dissipation. The tab is electrically tied to the collector, so isolation from ground or other nets is required unless intentional collector-to-plane connection is part of the circuit topology. Minimum pad dimensions follow Diodes' recommended layout: C1 = 6.40mm, Y2 = 8.00mm.
FZT758TC 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:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 400 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 200mA, 10V
- Power - Max:
- 2 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT758TC FAQ
1.How can I place an order for FZT758TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT758TC 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 FZT758TC reliable?
The price and inventory of FZT758TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT758TC is usually 5 days.
3.What payment methods are accepted for FZT758TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT758TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT758TC?
FZT758TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT758TC 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 FZT758TC?
For technical support, including FZT758TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT758TC requirements.
6.How does Aetrix verify that FZT758TC is sourced from the original manufacturer or authorized distributors?
All FZT758TC 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 FZT758TC meets industry standards.
7.What is the process for return or replacement of FZT758TC?
All FZT758TC units undergo pre-shipment inspection (PSI). If there is an issue with FZT758TC, 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 FZT758TC part is unused and in its original packaging.
Return procedure for FZT758TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FZT758TC Tags
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MMBT3906LT1G
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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