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Diodes Incorporated ZTX558STZ
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- Part No.:
- ZTX558STZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX558STZ.pdf
- Description:
- TRANS PNP 400V 0.2A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:1,206
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Product details
Overview
ZTX558STZ 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 serves as a robust switching or linear amplification device in high-voltage industrial power supplies, relay drivers, and flyback snubber circuits.
For engineers reviewing the ZTX558STZ datasheet, ZTX558STZ pinout, ZTX558STZ application, or ZTX558STZ equivalent, key selection criteria include verified -400V breakdown rating, hFE of 100–300 across -1mA to -100mA, VCE(sat) ≤ -0.5V at -50mA/-6mA, JEDEC-qualified reliability, and E-Line mechanical compatibility with TO-92 footprints.
Technical Context
The ZTX558STZ is a silicon PNP bipolar junction transistor optimized for high-voltage switching with guaranteed BVCEO ≥ -400V and low leakage (ICBO, ICES, IEBO ≤ -100nA at rated voltages). Its fT of 50MHz supports moderate-speed switching up to ~100kHz in hard-switched topologies.
Thermal design relies on two defined mounting conditions: 1.5W derated to 1W when mounted with 12mm leads on minimum pad layout (RθJA = 175°C/W); RθJL = 63.75°C/W enables effective heat conduction through the collector lead. ESD robustness includes 4kV HBM per JESD22-A114.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -400V - Sustains full rated voltage between collector and emitter with base open, enabling use in 350V DC bus switching. |
| IC (cont.) | -200mA - Continuous collector current capability supports medium-power load switching without forced cooling. |
| PD | 1W - Maximum steady-state power dissipation under standard 12mm-lead mounting; requires thermal derating above +25°C ambient. |
| hFE | 100–300 - DC current gain range at VCE = -10V ensures reliable base drive sizing across production lots and temperature. |
| VCE(sat) | ≤ -0.5V @ -50mA/-6mA - Low saturation voltage minimizes conduction loss in high-side switch configurations. |
| fT | 50MHz - Transition frequency allows stable operation in pulse-width modulated control loops up to ~100kHz. |
| ESD HBM | 4000V - Human Body Model rating meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
Package: E-Line (TO-92 compatible), molded green plastic, matte tin-plated leads, 159mg weight, UL 94V-0 rated. Dimensions per Diodes package outline DS33275 Rev. 2–2, with 0.70mm max lead hole diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current source terminal for PNP operation | Connected to higher potential rail; must withstand full -400V reverse bias relative to collector. |
| Base (B) | Control input for minority-carrier injection | Requires negative current (-2mA to -6mA typical) to saturate; VBE(on) = -0.9V at -50mA ensures predictable turn-on threshold. |
| Collector (C) | Current sink terminal | Primary heat path (RθJL = 63.75°C/W); soldered to PCB copper for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | BVCEO ≥ -400V enables direct interface with 300–350V DC link rails in offline SMPS and motor drives. |
| JEDEC-qualified reliability | Qualified to AEC-Q101 stress test standards and JEDEC high-reliability protocols for extended field life. |
| Green packaging | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb), RoHS 3 compliant, UL 94V-0 molding compound. |
| Thermally optimized leadform | Joggled leads (ZTX558STZ variant) improve mechanical retention and thermal transfer in through-hole assembly. |
Applications
| Industrial Power Supply Snubbers | AC/DC Flyback Primary Switch |
|---|---|
Use Scenario: Clamping voltage spikes across transformer primary windings during MOSFET turn-off in 24–48V output flyback converters. IC Role / Device Role / Timing Role: PNP transistor configured as active clamp switch, triggered by auxiliary winding voltage. Use Value: -400V VCEO withstands reflected flyback voltage plus ringing margin; low VCE(sat) reduces clamp loss. | Use Scenario: High-side switching element in low-cost, isolated AC/DC adapters delivering up to 5W output. IC Role / Device Role / Timing Role: Linear or quasi-resonant switch controlling energy transfer into transformer primary. Use Value: hFE stability across -1mA to -100mA simplifies base drive design; 1W PD supports continuous conduction mode operation. |
| Relay Driver Circuits | High-Voltage Signal Level Shifting |
Use Scenario: Driving 12–24V coil relays from microcontroller GPIOs in PLC I/O modules. IC Role / Device Role / Timing Role: Medium-current PNP switch sinking relay coil current to ground via collector. Use Value: -200mA IC rating exceeds typical 70–150mA relay hold current; -0.2V VCE(sat) at -20mA ensures minimal dropout. | Use Scenario: Translating logic-level signals to -300V referenced control lines in HV gate drivers or sensor interfaces. IC Role / Device Role / Timing Role: Level-shifting transistor biased in common-emitter configuration with emitter at HV rail. Use Value: -400V VCBO prevents breakdown when collector swings near ground while emitter sits at -300V. |
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 |
|---|---|---|---|
| ZTX550STZ | VCEO = -200V, IC = -500mA, PD = 1W, hFE = 100–300 | Lower voltage rating limits use to ≤170V DC bus; higher current supports larger relays or solenoids. | Select when system voltage is ≤200V and higher IC headroom is needed over ZTX558STZ. |
| MJD2955T4G | VCEO = -60V, IC = -10A, PD = 15W, TO-220 package | Not pin-compatible; requires heatsink; unsuitable for >100V applications due to lower BVCEO. | Choose only for high-current, low-voltage linear regulation where thermal mass and PCB space permit TO-220 mounting. |
Compared with ZTX558STZ, ZTX550STZ trades 200V headroom for +300mA IC in identical E-Line packaging, while MJD2955T4G offers 10× current but sacrifices voltage capability and requires board redesign-making ZTX558STZ optimal for 300–400V switching where footprint and voltage margin are critical.
Availability
ZTX558STZ is available at Aetrix Electronics and suitable for industrial power supply snubbers, AC/DC flyback primary switches, and relay driver circuits requiring stable component supply, long-term manufacturability, and JEDEC-qualified reliability.
Supply support for ZTX558STZ 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 distribution operations across Asia, Europe, and North America.
The ZTX series targets high-voltage, high-reliability discrete transistors for industrial, automotive, and computing power systems-designed specifically for ruggedized through-hole switching where voltage margin, thermal stability, and long-lifecycle support are essential.
FAQ
What is the maximum safe operating voltage for ZTX558STZ in continuous DC applications?
The ZTX558STZ is rated for VCEO = -400V with base open, meaning it can safely block up to -400V DC between collector and emitter under static conditions. For reliable long-term operation, design margins recommend limiting continuous applied voltage to ≤ -320V to accommodate transients and temperature derating per JEDEC guidelines.
Does ZTX558STZ require a heatsink in standard through-hole mounting?
No external heatsink is required for ZTX558STZ at ≤1W dissipation when mounted per Note 6: 12mm lead length on minimum recommended pad layout (RθJA = 175°C/W). At 25°C ambient, junction temperature remains ≤100°C. Forced airflow or elevated ambient (>50°C) may necessitate thermal analysis using RθJL = 63.75°C/W to the collector lead solder point.
How does the joggled lead form (STZ suffix) affect PCB assembly?
The joggled leads of ZTX558STZ provide enhanced mechanical retention during wave soldering and improved coplanarity for consistent through-hole insertion. Unlike straight leads (ZTX558), the controlled bend reduces risk of lead lift or tombstoning, especially on thicker boards or high-vibration assemblies, while maintaining full compatibility with standard TO-92 footprints and automated insertion equipment.
Is ZTX558STZ qualified for automotive applications?
ZTX558STZ itself is not AEC-Q101 qualified; however, Diodes offers automotive-grade equivalents (e.g., ZTX558Q) with PPAP documentation, IATF 16949 manufacturing, and full AEC-Q101 stress testing. Customers requiring automotive qualification must specify the Q-suffix part number and consult Diodes' Automotive Products portal for certified variants and change-control documentation.
ZTX558STZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- 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:
- 1 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX558STZ FAQ
1.How can I place an order for ZTX558STZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX558STZ 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 ZTX558STZ reliable?
The price and inventory of ZTX558STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX558STZ is usually 5 days.
3.What payment methods are accepted for ZTX558STZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX558STZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX558STZ?
ZTX558STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX558STZ 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 ZTX558STZ?
For technical support, including ZTX558STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX558STZ requirements.
6.How does Aetrix verify that ZTX558STZ is sourced from the original manufacturer or authorized distributors?
All ZTX558STZ 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 ZTX558STZ meets industry standards.
7.What is the process for return or replacement of ZTX558STZ?
All ZTX558STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX558STZ, 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 ZTX558STZ part is unused and in its original packaging.
Return procedure for ZTX558STZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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