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Diodes Incorporated ZTX558STOB
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- Part No.:
- ZTX558STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX558STOB.pdf
- Description:
- TRANS PNP 400V 0.2A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:2,916
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Product details
Overview
ZTX558STOB 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 25°C ambient. It serves as a robust switching or linear amplification device in high-voltage industrial power supplies, relay drivers, and ignition circuits where breakdown resilience and thermal stability are critical.
For engineers reviewing the ZTX558STOB datasheet, ZTX558STOB pinout, ZTX558STOB application, or ZTX558STOB equivalent, key selection factors include its -400V BVCEO, hFE of 100–300 at -1mA to -100mA, -0.5V VCE(sat) at -50mA/-6mA, fT = 50MHz, and ESD HBM rating of 4kV - all validated under JEDEC-referenced high-reliability test conditions.
Technical Context
The ZTX558STOB is a silicon PNP bipolar junction transistor optimized for high-voltage switching with guaranteed BVCEO ≥ -400V and low leakage (ICBO ≤ -100nA at -320V). Its DC current gain spans 100–300 across -1mA to -100mA collector currents, supporting stable biasing in both saturated and active regions.
Thermal performance is defined by two derating profiles: 1W at 12mm lead length (RθJA = 175°C/W), and 1.5W at 2.5mm lead length (RθJA = 116°C/W), with RθJL = 63.75°C/W confirming efficient heat conduction through the collector lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -400V - Withstands 400V reverse collector-emitter voltage before breakdown, enabling use in >300V DC bus switching. |
| IC (cont.) | -200mA - Supports sustained load currents up to 200mA without thermal runaway under proper heatsinking. |
| PD | 1W - Maximum steady-state power dissipation at TA = 25°C with 12mm lead length on FR4 PCB. |
| hFE | 100–300 - Provides predictable current amplification across -1mA to -100mA, easing base drive design. |
| VCE(sat) | -0.5V @ -50mA/-6mA - Ensures low conduction loss in saturated switch applications, reducing I²R heating. |
| fT | 50MHz - Enables reliable operation in medium-frequency switching (e.g., <500kHz PWM) and analog amplification. |
| ESD HBM | 4,000V - Meets JEDEC JESD22-A114 Class 3A, supporting handling in non-ESD-controlled assembly environments. |
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 (E) | Current source terminal for PNP operation | Connected to highest potential node; must be biased above base and collector for forward-active mode. |
| Base (B) | Control electrode for minority-carrier injection | Receives negative current to turn on; requires ~-0.9V VBE(sat) at -50mA IC. |
| Collector (C) | Current sink terminal | Connected to load and supply return; handles full switched current and dissipates majority of power. |
Key Features
| Feature | Design Value |
|---|---|
| High breakdown voltage | BVCEO ≥ -400V ensures safe operation in 300–400V DC systems like industrial SMPS and motor drives. |
| JEDEC-qualified reliability | Qualified to AEC-Q101-referenced high-reliability standards, supporting long-term deployment in harsh environments. |
| Green RoHS compliance | Fully lead-free, halogen-free (<900ppm Br/Cl, <1000ppm Sb), meeting automotive and industrial environmental mandates. |
| Thermally optimized lead frame | RθJL = 63.75°C/W enables effective heat transfer from junction to solder point, improving pulse handling. |
Applications
| Industrial Power Supply | Automotive Ignition Driver |
|---|---|
|
Use Scenario: High-side switch in offline flyback auxiliary supply with 375V DC bus. IC Role / Device Role / Timing Role: PNP high-voltage switch controlling gate drive transformer primary current. Use Value: -400V VCEO margin prevents avalanche failure during line surges; 1W PD supports intermittent 150mA peak loads. |
Use Scenario: Primary-side coil driver in distributorless ignition system. IC Role / Device Role / Timing Role: Fast-switching PNP transistor triggering 12V→400V coil energy dump. Use Value: 50MHz fT and 1600ns toff enable precise spark timing; 4kV ESD HBM withstands vehicle EMI transients. |
| Relay & Solenoid Driver | High-Voltage Linear Amplifier |
|
Use Scenario: Driving 24V/150mA latching relay in factory automation PLC output stage. IC Role / Device Role / Timing Role: Saturated PNP switch interfacing microcontroller GPIO to inductive load. Use Value: -0.5V VCE(sat) minimizes dropout and self-heating; hFE ≥100 simplifies base resistor selection. |
Use Scenario: Constant-current source for HV bias in photomultiplier tube (PMT) front-end. IC Role / Device Role / Timing Role: Active current regulator operating in linear region with -400V collector supply. Use Value: Low ICBO (≤-100nA) ensures stable current setpoint over temperature; 200°C max TJ supports sealed enclosure use. |
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 |
|---|---|---|---|
| ZTX550 | BVCEO = -200V (half ZTX558's rating); same E-Line package and hFE range. | Suitable only for ≤200V systems; not interchangeable in 300–400V designs without redesign. | Select when lower voltage margin suffices and cost optimization is prioritized. |
| MJD2955T4G | TO-220 package, -70V VCEO, -10A IC; higher current but much lower voltage rating. | Used in high-current, low-voltage power stages (e.g., linear regulators), not HV switching. | Choose only for applications demanding >1A current and board-level heatsinking - not a drop-in replacement. |
Compared with ZTX558STOB, ZTX550 sacrifices 200V breakdown headroom for cost reduction, while MJD2955T4G trades voltage capability for current capacity and thermal mass - neither matches ZTX558STOB's unique 400V/200mA/1W balance in through-hole form factor.
Availability
ZTX558STOB is available at Aetrix Electronics and suitable for industrial power supplies, automotive ignition systems, relay drivers, and high-voltage linear amplifiers requiring stable component supply and JEDEC-qualified reliability.
Supply support for ZTX558STOB 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.
ZTX558STOB belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for ruggedized switching and amplification in industrial, automotive, and power-conversion applications where breakdown voltage and thermal robustness are critical.
FAQ
What is the maximum safe operating voltage for ZTX558STOB in continuous DC applications?
The ZTX558STOB is rated for continuous collector-emitter voltage (VCEO) of -400V at TA = 25°C. Derating applies above 25°C per Figure 1 in DS33275 Rev. 2–2; at 100°C ambient, maximum VCEO drops to approximately -320V. Operation beyond -400V risks irreversible avalanche breakdown.
Can ZTX558STOB be used in surface-mount designs?
No - ZTX558STOB uses the through-hole E-Line (TO-92 compatible) package with straight leads and is designed for hole-mount PCB assembly. It lacks SMD-compatible terminations or thermal pad structure; no official SMT variant exists in Diodes' portfolio.
How does the 12mm lead length affect thermal performance compared to the 2.5mm condition?
With 12mm leads, ZTX558STOB's RθJA is 175°C/W and PD is limited to 1W; with 2.5mm leads on specified copper area, RθJA improves to 116°C/W and PD rises to 1.5W. Longer leads increase thermal resistance, reducing usable power at elevated temperatures.
Is ZTX558STOB qualified for automotive applications under AEC-Q101?
ZTX558STOB itself is not AEC-Q101 qualified; however, Diodes offers automotive-grade variants (e.g., ZTX558Q) with Q-suffix marking, PPAP capability, and manufacturing in IATF 16949-certified facilities. These meet AEC-Q101 stress testing requirements for automotive use.
ZTX558STOB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- 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:
- 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)
ZTX558STOB FAQ
1.How can I place an order for ZTX558STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX558STOB 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 ZTX558STOB reliable?
The price and inventory of ZTX558STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX558STOB is usually 5 days.
3.What payment methods are accepted for ZTX558STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX558STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX558STOB?
ZTX558STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX558STOB 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 ZTX558STOB?
For technical support, including ZTX558STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX558STOB requirements.
6.How does Aetrix verify that ZTX558STOB is sourced from the original manufacturer or authorized distributors?
All ZTX558STOB 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 ZTX558STOB meets industry standards.
7.What is the process for return or replacement of ZTX558STOB?
All ZTX558STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZTX558STOB, 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 ZTX558STOB part is unused and in its original packaging.
Return procedure for ZTX558STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTX558STOB Tags
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