My Inquiry
My Account
Diodes Incorporated FZT558TC
- Part No.:
- FZT558TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT558TC.pdf
- Description:
- TRANS PNP 400V 0.2A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,408
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FZT558TC from Diodes Incorporated is a 400V PNP high-voltage transistor in SOT223 package, designed for high-voltage switching and linear regulation in industrial power supplies and motor control circuits. It delivers -200mA continuous collector current, supports -400V VCEO, achieves VCE(sat) < -200mV at -20mA, and maintains hFE ≥ 100 up to -100mA.
For engineers reviewing the FZT558TC datasheet, FZT558TC pinout, FZT558TC application, or FZT558TC equivalent, key selection criteria include high-voltage blocking capability, low saturation voltage under moderate current, thermal performance on 25mm × 25mm PCB copper, and compatibility with complementary NPN FZT458 in push-pull topologies.
Technical Context
This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with guaranteed breakdown at -400V across both collector-base and collector-emitter terminals. Its hFE remains stable from -1mA to -100mA (100–300), supporting precise current amplification in feedback loops and driver stages.
With fT = 50MHz and Cobo = 5pF at -20V, it enables fast switching in <1µs turn-on and ~1.6µs turn-off times under defined test conditions. Thermal resistance RθJA is 62.5°C/W on 25mm × 25mm 2oz FR4, enabling 2W dissipation at +25°C ambient before derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -400V - Blocks 400V reverse collector-emitter voltage without breakdown, suitable for flyback snubbers and high-side switch rails. |
| IC (cont.) | -200mA - Supports sustained load current up to 200mA in linear regulators or relay drivers without secondary derating. |
| VCE(sat) | < -200mV @ -20mA - Minimizes conduction loss and self-heating in saturated-switch applications like solenoid control. |
| hFE | 100–300 @ IC = -1mA to -100mA - Enables predictable base drive design across three decades of operating current. |
| fT | 50MHz - Supports switching frequencies up to several MHz in Class-A/B amplifiers or PWM gate drivers. |
| RθJA | 62.5°C/W - Requires ≥25mm × 25mm 2oz copper pad for full 2W power handling at +25°C ambient. |
| ESD HBM | 4,000V - Withstands human-body model ESD events common during board assembly and handling. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin configuration with emitter-connected tab for thermal and electrical connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Connected to internal emitter region and exposed metal tab; must be soldered to large copper area for thermal management and circuit return path. |
| 2 (Base) | Base control terminal | Low-impedance input requiring ~5mA drive for full saturation at -50mA collector current; polarity-sensitive for PNP operation. |
| 3 (Collector) | Collector terminal | Main high-voltage current path; electrically isolated from tab; routed away from sensitive analog traces due to capacitance coupling. |
| 4 (Emitter/Tab) | Emitter extension / thermal pad | Same potential as Pin 1; provides primary thermal conduction path to PCB; requires minimum 25mm² 2oz copper for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | VCEO = -400V enables direct use in 300V DC bus interfaces and offline auxiliary supplies without external clamping. |
| Low saturation loss | VCE(sat) < -200mV at -20mA reduces power loss to <4mW, critical for thermally constrained industrial modules. |
| Stable gain over current range | hFE ≥ 100 from -1mA to -100mA simplifies bias network design and improves loop stability in current mirrors. |
| Thermally optimized package | SOT223 with exposed emitter tab achieves RθJL = 19.41°C/W, allowing efficient heat transfer to PCB without heatsinks. |
| Automotive-qualified option | FZT558TA variant meets AEC-Q101 requirements and is manufactured in IATF 16949-certified facilities for automotive subsystems. |
Applications
| Industrial Power Supply Auxiliary Rail | DC Motor Direction Control |
|---|---|
|
Use Scenario: Generating isolated -12V/-15V bias for op-amps and gate drivers in 300–400V DC link systems. IC Role / Device Role / Timing Role: High-voltage PNP pass transistor regulating unregulated winding output with Zener reference feedback. Use Value: Leverages -400V VCEO to withstand reflected transients while maintaining sub-200mV dropout for stable low-noise bias. |
Use Scenario: Driving one side of an H-bridge leg in 24–48V brushed DC motor controllers. IC Role / Device Role / Timing Role: High-side PNP switch controlling current flow into motor winding during reverse polarity phase. Use Value: Uses low VCE(sat) and robust hFE to minimize conduction loss and ensure reliable turn-on with standard microcontroller GPIO drive. |
| Relay and Solenoid Driver | High-Voltage Signal Level Shifting |
|
Use Scenario: Directly switching 24V/48V relays or pneumatic solenoids in PLC I/O modules. IC Role / Device Role / Timing Role: Saturated PNP switch interfacing microcontroller outputs to inductive loads with integrated flyback protection. Use Value: Delivers -200mA continuous current with fast turn-off (1.6µs) to reduce contact arcing and improve relay lifetime. |
Use Scenario: Translating logic-level signals to ±300V domain in HV sensor interface or isolation amplifier front-ends. IC Role / Device Role / Timing Role: PNP level shifter translating TTL/CMOS inputs to high-side referenced outputs using open-collector topology. Use Value: Maintains signal integrity via low Cobo (5pF) and high fT (50MHz), minimizing propagation delay and capacitive feedthrough. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | VCEO = -300V, IC = -1A, hFE = 100–800, SOT89 package | Higher current but lower voltage rating; larger footprint and higher RθJA (70°C/W) | Select when >200mA load current is required and 300V blocking suffices; avoid in 400V bus designs. |
| MJD2955T4G | VCEO = -60V, IC = -10A, hFE = 20–100, TO-220 package | Lower voltage, higher current, vastly larger thermal mass; not drop-in compatible | Choose only for low-voltage, high-current linear regulation where PCB space and thermal mass permit TO-220 mounting. |
Compared with ZTX653 and MJD2955T4G, FZT558TC uniquely balances 400V blocking, SOT223 compactness, and sub-200mV saturation-making it optimal for space-constrained, medium-current, high-voltage industrial switching where voltage margin and thermal efficiency are prioritized over raw current capacity.
Availability
FZT558TC is available at Aetrix Electronics and suitable for industrial power supply auxiliary rails, DC motor direction control, and relay/solenoid driver circuits requiring stable component supply and long-term manufacturability.
Supply support for FZT558TC 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.
FZT558TC belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for industrial and automotive power management applications demanding robust voltage tolerance, thermal reliability, and RoHS-compliant packaging.
FAQ
What is the maximum safe operating voltage for FZT558TC in continuous DC applications?
The absolute maximum collector-emitter voltage (VCEO) is -400V at TA = +25°C. For reliable long-term operation, Diodes recommends limiting steady-state VCE to ≤ -320V per leakage current specifications (ICES ≤ -100nA). Derating is required above +25°C ambient per Figure 4's 25mm × 25mm derating curve.
Can FZT558TC be used as a direct replacement for FZT458 in complementary circuits?
No - FZT558TC is PNP while FZT458 is its complementary NPN counterpart. They share identical SOT223 package dimensions and voltage/current ratings but opposite polarity. In push-pull or totem-pole configurations, both must be used together with matched base drive networks to ensure symmetrical switching behavior and avoid shoot-through.
Does FZT558TC require a heatsink in typical SOT223 PCB layouts?
Not for ≤2W dissipation at +25°C ambient, provided the emitter tab is soldered to ≥25mm² of 2oz copper. On 25mm × 25mm 2oz FR4, RθJA = 62.5°C/W yields +125°C junction rise at full 2W - within the -55°C to +150°C operating range. Heatsinking is unnecessary unless ambient exceeds +50°C or power exceeds 1.2W continuously.
Is FZT558TC qualified for automotive applications?
The FZT558TA variant is AEC-Q101 qualified, PPAP-capable, and manufactured in IATF 16949-certified facilities. The standard FZT558TC is not automotive-qualified; users requiring automotive compliance must specify FZT558TA and engage Diodes' automotive support team for change control documentation and qualification reports.
FZT558TC 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):
- 200 mA
- Voltage - Collector Emitter Breakdown (Max):
- 400 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 6mA, 50mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 50mA, 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
FZT558TC FAQ
1.How can I place an order for FZT558TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT558TC 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 FZT558TC reliable?
The price and inventory of FZT558TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT558TC is usually 5 days.
3.What payment methods are accepted for FZT558TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT558TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT558TC?
FZT558TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT558TC 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 FZT558TC?
For technical support, including FZT558TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT558TC requirements.
6.How does Aetrix verify that FZT558TC is sourced from the original manufacturer or authorized distributors?
All FZT558TC 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 FZT558TC meets industry standards.
7.What is the process for return or replacement of FZT558TC?
All FZT558TC units undergo pre-shipment inspection (PSI). If there is an issue with FZT558TC, 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 FZT558TC part is unused and in its original packaging.
Return procedure for FZT558TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FZT558TC Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
