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Diodes Incorporated FZT558
- Part No.:
- FZT558
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT558.pdf
- Description:
- TRANS PNP 400V 0.2A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,075
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Product details
Overview
FZT558 from Diodes Incorporated is a 400V PNP high-voltage transistor in SOT223 package, designed for switching and linear amplification in high-voltage industrial power supplies and motor control circuits. It delivers -200mA continuous collector current, supports -400V VCEO, achieves hFE ≥100 at -1mA, and exhibits VCE(sat) < -200mV at -20mA/ -2mA drive - enabling efficient high-side switching in flyback snubbers and relay drivers.
For engineers reviewing the FZT558 datasheet, FZT558 pinout, FZT558 application, or FZT558 equivalent, key selection criteria include verified high-voltage blocking capability (-400V), low saturation voltage under defined bias conditions, thermal performance on standard PCB copper areas, complementary pairing with FZT458, and AEC-Q101 qualification readiness for automotive-grade designs.
Technical Context
The FZT558 operates as a silicon PNP bipolar junction transistor optimized for high-voltage switching where robust breakdown margin and stable DC current gain are critical. Its BVCEO = -400V and BVCBO = -400V ensure reliable operation in circuits exposed to transient overvoltages up to 320V reverse bias (ICBO/ICES tested at -320V).
It features low VCE(sat) (-0.2V typ. @ -20mA/-2mA) and high hFE (100–300 across -1mA to -100mA), supporting both saturated switching and analog amplification. fT = 50MHz enables use in moderate-speed switching applications such as PWM-controlled DC-DC feedback paths and gate driving stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -400V - Withstands 400V reverse collector-emitter voltage without breakdown, suitable for 300V+ DC bus switching. |
| IC (cont.) | -200mA - Supports sustained load current up to 200mA in TO-223 footprint with adequate PCB copper area. |
| VCE(sat) | < -0.2V @ -20mA/-2mA - Minimizes conduction loss in saturated switch mode; reduces heat generation in relay/motor driver stages. |
| hFE | 100–300 - Provides predictable base drive requirements across operating range; enables stable biasing in linear regulators and amplifiers. |
| fT | 50MHz - Enables use in PWM frequencies up to ~5MHz with acceptable gain margin; sufficient for SMPS feedback and gate drive buffering. |
| RθJA | 62.5°C/W (25mm×25mm 2oz Cu) - Thermal design must allocate ≥25mm² of 2oz copper per device for 2W dissipation at +25°C ambient. |
| ESD HBM | 4kV - Meets JEDEC Class 3A ESD robustness; supports handling in non-classified assembly environments. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin configuration with collector tab (pin 1), emitter (pin 2), base (pin 3), and collector (pin 4). Molded green compound, UL 94V-0 rated, 0.112g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Collector Tab) | Main collector connection & thermal path | Electrically and thermally connected to internal collector; requires soldered copper pad for heat dissipation and current conduction. |
| Pin 2 (Emitter) | Emission terminal for majority carriers | Connected to circuit ground or low-side return path; carries full load current in common-emitter configurations. |
| Pin 3 (Base) | Control input for minority carrier injection | Receives current-limited drive signal; base resistor selection must ensure IB ≥ IC/hFE(min) for saturation. |
| Pin 4 (Collector) | Secondary collector connection | Internally tied to Pin 1; provides redundant current path and mechanical stability; must be connected to same net as Pin 1. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | BVCEO = -400V ensures safe operation in 300–400V DC link applications including offline SMPS and industrial AC-DC converters. |
| Low saturation voltage | VCE(sat) < -0.2V at -20mA/-2mA reduces power loss and self-heating in high-duty-cycle switching nodes. |
| Stable DC current gain | hFE ≥100 at -1mA and ≥15 at -100mA enables consistent bias design across wide current range without gain collapse. |
| Thermal performance | RθJL = 19.41°C/W to leads allows effective heat transfer through solder joints into PCB copper, improving reliability vs. RθJA-only metrics. |
| AEC-Q101 readiness | Manufactured in IATF 16949 facilities with PPAP capability; supports automotive qualification path for high-reliability power modules. |
Applications
| Industrial Power Supply Snubber | Automotive HVAC Blower Control |
|---|---|
Use Scenario: Clamping voltage spikes across transformer primary windings in flyback converters operating from 300V DC bus. IC Role / Device Role / Timing Role: High-voltage PNP switch configured in active-clamp topology to absorb leakage energy and limit peak VCE. Use Value: -400V VCEO withstands repetitive 350V transients; low VCE(sat) minimizes clamp loss during conduction phase. | Use Scenario: Driving brushed DC blower motor in automotive HVAC systems with PWM-controlled speed regulation. IC Role / Device Role / Timing Role: High-side PNP switch controlling motor supply rail; base driven by microcontroller GPIO via level-shifting resistor network. Use Value: Stable hFE across -10mA to -150mA enables predictable base drive sizing; -400V rating accommodates inductive kickback up to 100V. |
| Programmable Current Limiter | High-Voltage Relay Driver |
Use Scenario: Precision current source for LED string biasing or sensor excitation in industrial instrumentation with 200V compliance range. IC Role / Device Role / Timing Role: Linear-mode PNP pass element controlled by op-amp feedback loop to regulate output current. Use Value: hFE ≥100 at -1mA ensures low base current error; -400V VCEO supports >150V headroom for 200V-rated loads. | Use Scenario: Driving 24V/48V coil relays in programmable logic controllers (PLCs) where high-side switching isolates control logic from load ground. IC Role / Device Role / Timing Role: Saturated PNP switch interfacing microcontroller outputs to relay coils with galvanic separation. Use Value: VCE(sat) < -0.2V limits relay coil power loss to <5mW at 20mA; SOT223 thermal resistance supports 100% duty cycle at rated current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | VCEO = -300V, hFE = 100–250, SOT89 package, RθJA = 125°C/W | Limited to ≤300V systems; higher thermal resistance requires larger copper area for same power dissipation. | Select when lower voltage rating suffices and SOT89 mounting is preferred. |
| MJD2955T4G | VCEO = -60V, IC = -12A, TO-220 package, RθJA = 1.5°C/W | Not high-voltage capable; suited only for low-voltage, high-current linear/switching use cases. | Choose only for <100V applications requiring >1A current and heatsink mounting. |
Compared with ZTX653 and MJD2955T4G, the FZT558 uniquely balances -400V blocking, SOT223 surface-mount compatibility, and 200mA current handling - making it optimal for space-constrained, high-voltage industrial controls where thermal management relies on PCB copper rather than external heatsinks.
Availability
FZT558 is available at Aetrix Electronics and suitable for industrial power supply snubbers, automotive HVAC blower control, and high-voltage relay drivers requiring stable component supply and long-term manufacturability.
Supply support for FZT558 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.
The FZT558 belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for industrial and automotive power management applications demanding robust voltage tolerance, stable gain, and surface-mount thermal efficiency.
FAQ
What is the maximum continuous collector current for FZT558?
The FZT558 supports -200mA continuous collector current at TA = +25°C with the collector lead mounted on 25mm × 25mm 2oz copper on FR4. Derating applies above +25°C ambient per Figure 4 in DS33139 Rev. 6-2; at +100°C, max IC drops to approximately -120mA under the same PCB conditions.
Is FZT558 qualified for automotive applications?
FZT558 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, Diodes states it meets requirements for automotive applications "requiring specific change control" - meaning qualification can be pursued per customer program needs with documented test plans and lot traceability.
How does the dual-collector pin configuration affect PCB layout?
Pins 1 and 4 are internally shorted to the collector; both must be connected to the same high-current net and soldered to a shared thermal pad. Separating them creates impedance imbalance and degrades thermal performance. The recommended pad layout (C1 = 6.40mm, Y2 = 8.00mm) ensures mechanical stability and optimal heat transfer per Diodes' SOT223 (Type DN) outline.
What is the typical transition frequency (fT) and its practical implication?
The FZT558 has fT = 50MHz at VCE = -20V and IC = -10mA. This indicates usable small-signal gain up to ~5MHz, making it appropriate for PWM feedback loops, gate driver buffering, and moderate-speed switching - but not for RF or >10MHz digital signal routing where gain rolls off significantly.
FZT558 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
FZT558 FAQ
1.How can I place an order for FZT558 through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT558 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 FZT558 reliable?
The price and inventory of FZT558 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT558 is usually 5 days.
3.What payment methods are accepted for FZT558?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT558 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT558?
FZT558 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT558 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 FZT558?
For technical support, including FZT558 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT558 requirements.
6.How does Aetrix verify that FZT558 is sourced from the original manufacturer or authorized distributors?
All FZT558 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 FZT558 meets industry standards.
7.What is the process for return or replacement of FZT558?
All FZT558 units undergo pre-shipment inspection (PSI). If there is an issue with FZT558, 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 FZT558 part is unused and in its original packaging.
Return procedure for FZT558:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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