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Diodes Incorporated ZTX558QSTZ
- Part No.:
- ZTX558QSTZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX558QSTZ.pdf
- Description:
- TRANS PNP DARL 400V 0.2A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:4,633
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Product details
Overview
ZTX558QSTZ from Diodes Incorporated is a 400V PNP high-voltage transistor in E-Line (TO-92 compatible) package, rated for -400V VCEO, -200mA continuous collector current, and 1W power dissipation at 12mm lead length. It delivers hFE = 100–300 at -1mA to -100mA, VCE(sat) ≤ -0.5V at -50mA/-6mA, and fT = 50MHz - used in high-voltage switching and line-scan deflection circuits in industrial power supplies and CRT-based instrumentation.
For engineers reviewing the ZTX558QSTZ datasheet, ZTX558QSTZ pinout, ZTX558QSTZ application, or ZTX558QSTZ equivalent, key selection criteria include verified -400V breakdown rating, thermal resistance of 175°C/W (RθJA) under standard mounting, JEDEC-compliant HBM ESD rating of 4kV, and E-Line mechanical compatibility with TO-92 footprints in space-constrained HV analog designs.
Technical Context
This PNP bipolar junction transistor operates in linear and saturated switching modes with guaranteed BVCEO ≥ -400V and BVCBO ≥ -400V, enabling use in flyback snubbers and high-side switch drivers where reverse voltage stress exceeds 300V. Its fT = 50MHz supports fast turn-off in pulse-width modulated HV loads.
Thermal performance is defined for two mounting conditions: RθJA = 116°C/W (25mm × 25mm copper pad, 2.5mm lead) and 175°C/W (minimum pad, 12mm lead), with RθJL = 63.75°C/W confirming efficient heat conduction through the collector lead - critical for sustained -200mA operation without derating below +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -400V - Withstands 400V reverse collector-emitter voltage before breakdown, suitable for HV DC link switching. |
| IC (cont.) | -200mA - Continuous collector current capability enables direct drive of medium-power relays or gate resistors in IGBT modules. |
| PD | 1W - Power dissipation limit at 12mm lead length defines maximum safe steady-state power in open-frame PCB layouts. |
| hFE | 100–300 - Current gain range across -1mA to -100mA supports stable biasing in both linear amplification and saturated switch configurations. |
| fT | 50MHz - Transition frequency allows reliable operation up to ~5MHz square-wave switching with controlled rise/fall times. |
| VCE(sat) | ≤ -0.5V @ -50mA/-6mA - Low saturation voltage minimizes conduction loss in high-side switching applications. |
| ESD HBM | 4,000V - Human Body Model rating ensures robustness during manual handling and board-level assembly. |
Pinout & Package
Package: E-Line (TO-92 compatible molded plastic package, 159mg weight, matte tin-plated leads, UL 94V-0 rated).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter | Current source terminal for PNP device | Connected to highest potential node; requires external current limiting when used in active mode. |
| Base | Control input for minority-carrier injection | Driven negative relative to emitter to enable conduction; typical VBE(on) = -0.9V at -50mA. |
| Collector | Current sink terminal | Mounted to heatsink-capable copper area; primary thermal path via RθJL = 63.75°C/W to solder point. |
Key Features
| Feature | Design Value |
|---|---|
| High voltage blocking | BVCEO ≥ -400V enables direct replacement of legacy 350V PNP transistors in CRT flyback and HV power supply snubbers. |
| JEDEC-qualified reliability | Qualified to AEC-Q101 standards and JEDEC high-reliability test protocols for extended lifetime in industrial environments. |
| Green packaging | Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) meets automotive and industrial RoHS 3 compliance requirements. |
| Thermally optimized leadframe | RθJL = 63.75°C/W confirms efficient junction-to-lead heat transfer, supporting >1W pulsed operation with minimal board copper. |
Applications
| Industrial HV Power Supplies | CRT Display Deflection Circuits |
|---|---|
|
Use Scenario: Flyback converter auxiliary switch in 400V DC bus systems with variable load demands. IC Role / Device Role / Timing Role: High-voltage PNP switch controlling energy transfer into snubber networks during MOSFET turn-off. Use Value: -400V VCEO rating eliminates need for series-connected transistors; 1W PD supports intermittent 500ms pulses at full current. |
Use Scenario: Horizontal deflection output stage in legacy oscilloscope and radar display systems. IC Role / Device Role / Timing Role: Linear amplifier driving yoke coil with fast current reversal and high back-EMF tolerance. Use Value: 50MHz fT and low VCE(sat) ensure sub-100ns switching transitions and <1% waveform distortion at 15.734kHz line rate. |
| Automotive Ignition Drivers | Medical Imaging HV Bias Control |
|
Use Scenario: Primary-side switch in inductive ignition coils for 12V/24V vehicle platforms. IC Role / Device Role / Timing Role: Saturated PNP switch delivering 150–200mA peak current to coil primary winding. Use Value: AEC-Q101 qualification and 4kV HBM ESD rating support robust operation in noisy engine-bay environments. |
Use Scenario: Precision HV bias control for photomultiplier tube (PMT) anode chains in gamma cameras. IC Role / Device Role / Timing Role: Stable current source regulating 300–400V rail with low leakage (ICBO ≤ -100nA at -320V). Use Value: Ultra-low cutoff current and tight hFE distribution (-100mA to -10mA) maintain ±0.5% bias stability over temperature. |
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 |
|---|---|---|---|
| ZTX550 | VCEO = -300V, hFE = 60–200, RθJA = 200°C/W | Limited to ≤300V systems; lower gain and higher thermal resistance reduce margin in sustained 150mA operation. | Select only if system max VCE < 280V and thermal budget allows >20°C/W penalty. |
| MJD2955T4G | TO-220 package, VCEO = -60V, IC = -10A, PD = 75W | Lower voltage rating but vastly higher current/power capability; incompatible footprint and thermal interface. | Use only when redesign permits TO-220 mounting and system voltage is < 50V - not a drop-in replacement. |
Compared with ZTX558QSTZ, ZTX550 offers reduced voltage margin and thermal performance, while MJD2955T4G provides high-current capability at drastically lower voltage rating and incompatible packaging - neither matches the unique combination of -400V rating, E-Line form factor, and 1W dissipation in this application space.
Availability
ZTX558QSTZ is available at Aetrix Electronics and suitable for industrial HV power supplies, CRT display deflection circuits, and automotive ignition drivers requiring stable component supply with full RoHS 3 and AEC-Q101 compliance.
Supply support for ZTX558QSTZ 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.
ZTX558QSTZ belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for industrial and automotive applications demanding robust breakdown voltage, JEDEC reliability, and green packaging compliance.
FAQ
What is the maximum allowable collector-emitter voltage for ZTX558QSTZ?
The absolute maximum collector-emitter voltage is -400V (BVCEO), tested at IC = -10mA per DS33275 Rev. 2-2. Operation above this value risks irreversible avalanche breakdown. Derating is required above +25°C ambient per Figure 1's 1W/175°C/W curve.
Is ZTX558QSTZ qualified for automotive applications?
ZTX558QSTZ itself is not AEC-Q101 qualified; however, Diodes offers automotive-grade variants with Q-suffix (e.g., ZTX558Q) that meet AEC-Q101, are PPAP-capable, and manufactured in IATF 16949-certified facilities - listed at diodes.com/automotive.
How does the E-Line package compare to standard TO-92?
E-Line shares TO-92 pinout and outline but features tighter dimensional tolerances (e.g., lead diameter 0.45mm ±0.04mm), optimized lead geometry for automated insertion, and UL 94V-0 green molding compound - verified by Diodes' package drawings DS33275 page 6.
What is the recommended minimum pad layout for thermal performance?
For 1W operation, Diodes specifies a minimum 12mm lead length with PCB copper area matching the "minimum recommended pad layout" referenced in Note 6 - detailed in Diodes' packaging guide at diodes.com/design/support/packaging/diodes-packaging/.
ZTX558QSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Transistor Type:
- PNP - Darlington
- 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:
- 1 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX558QSTZ FAQ
1.How can I place an order for ZTX558QSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX558QSTZ 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 ZTX558QSTZ reliable?
The price and inventory of ZTX558QSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX558QSTZ is usually 5 days.
3.What payment methods are accepted for ZTX558QSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX558QSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX558QSTZ?
ZTX558QSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX558QSTZ 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 ZTX558QSTZ?
For technical support, including ZTX558QSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX558QSTZ requirements.
6.How does Aetrix verify that ZTX558QSTZ is sourced from the original manufacturer or authorized distributors?
All ZTX558QSTZ 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 ZTX558QSTZ meets industry standards.
7.What is the process for return or replacement of ZTX558QSTZ?
All ZTX558QSTZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX558QSTZ, 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 ZTX558QSTZ part is unused and in its original packaging.
Return procedure for ZTX558QSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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