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Diodes Incorporated ZTX758STZ
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- Part No.:
- ZTX758STZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX758STZ.pdf
- Description:
- TRANS PNP 400V 0.5A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:9,039
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Product details
Overview
ZTX758STZ from Diodes Incorporated is a PNP medium-power high-voltage transistor in E-Line (TO-92 compatible) package, rated for -400V VCEO, -0.5A continuous collector current, and 1W power dissipation at +25°C ambient. It operates up to +200°C junction temperature and features low saturation voltage of -250mV at -50mA/-5mA drive, making it suitable for high-voltage switching in industrial power supplies and relay drivers.
For engineers reviewing the ZTX758STZ datasheet, ZTX758STZ pinout, ZTX758STZ application, or ZTX758STZ equivalent, key selection criteria include its -400V breakdown rating, AEC-Q101 qualification, TO-92-compatible E-Line mechanical form factor, thermal resistance of 175°C/W (min pad layout), and verified pulse current capability of -1A.
Technical Context
This PNP bipolar junction transistor is designed for high-voltage linear and switching operation in DC-DC converters, lamp ballasts, and solenoid/relay interface circuits. Its -400V VCEO and VCBO ratings enable use in 300V+ bus applications, while its -250mV VCE(sat) at -50mA/-5mA ensures low conduction loss in medium-current switching nodes.
The device supports high-temperature operation up to +200°C junction temperature and meets AEC-Q101 stress testing requirements for automotive-grade reliability. Its fT of 50MHz and Cobo of 20pF at -20V support moderate-speed switching with predictable turn-on (140ns) and turn-off (2000ns) behavior under defined test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -400V - supports operation on 300V DC rails with 33% safety margin |
| IC (cont.) | -0.5A - drives loads such as 12V/500mA relays or small solenoids |
| PD | 1W - enables self-heating-limited operation without heatsink below ~25°C ambient |
| VCE(sat) | -250mV @ -50mA/-5mA - reduces power loss to ≤12.5mW in saturated switch mode |
| hFE | 50 @ -100mA/-5V - provides stable current amplification for base-driven control circuits |
| RθJA | 175°C/W - requires careful PCB copper area management for thermal compliance at full load |
| fT | 50MHz - supports switching frequencies up to ~5MHz with acceptable gain roll-off |
Pinout & Package
E-Line (TO-92 compatible) package with matte tin-plated joggled leads; molded green plastic case rated UL 94V-0; weight ≈0.159g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal for PNP operation | Connected to higher-potential rail; defines reference for base bias and collector load |
| Base (B) | Control input for minority-carrier injection | Receives negative current to forward-bias B-E junction and enable conduction |
| Collector (C) | Current output terminal | Connected to load and lower-potential node; carries full switched current with minimal saturation drop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control and lighting modules |
| -400V breakdown rating | Enables direct interface with 277VAC rectified outputs or 300VDC intermediate bus stages |
| +200°C maximum junction temperature | Supports operation in sealed enclosures or near heat-generating components without derating |
| Low VCE(sat) (-250mV) | Minimizes conduction loss and self-heating in medium-current switching applications |
| Green, halogen-free construction | Complies with IPC-1752A material declaration requirements for RoHS and REACH reporting |
Applications
| Industrial Power Supply | Automotive Relay Driver |
|---|---|
Use Scenario: High-voltage auxiliary supply for PLC I/O modules operating from 277VAC mains. IC Role / Device Role / Timing Role: PNP switch controlling primary-side startup circuit and bias winding regulation. Use Value: -400V VCEO withstands peak rectified voltage; 1W dissipation sustains startup surge without external heatsink. | Use Scenario: Driving 12V automotive relays in body control modules. IC Role / Device Role / Timing Role: Medium-current interface between microcontroller GPIO and relay coil. Use Value: AEC-Q101 qualification ensures reliability; -250mV VCE(sat) limits coil power loss to <13mW at 50mA. |
| Lamp Ballast Control | Solenoid Interface |
Use Scenario: Current-regulated preheat stage in electronic fluorescent lamp ballasts. IC Role / Device Role / Timing Role: Linear-mode current source controlling filament heating current. Use Value: +200°C TJ rating accommodates enclosure temperatures >100°C; hFE = 50 ensures stable current gain across temperature. | Use Scenario: 24V DC solenoid actuation in HVAC damper controls. IC Role / Device Role / Timing Role: High-voltage switch enabling fast turn-off via active pull-down. Use Value: 2000ns toff allows precise dwell time control; -400V rating prevents breakdown during inductive kickback. |
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 |
|---|---|---|---|
| ZTX753STZ | -300V VCEO, same package and pinout | Lower voltage rating restricts use to ≤240VDC systems | Select when system bus voltage remains below 240V and cost optimization is prioritized |
| MJD2955T4G | TO-220 package, -60V VCEO, -10A IC | Higher current but significantly lower voltage capability; incompatible footprint | Choose only for high-current, low-voltage linear regulation where thermal mass justifies TO-220 mounting |
Compared with ZTX758STZ, ZTX753STZ offers identical form factor and cost advantage but sacrifices 100V of voltage margin, while MJD2955T4G delivers tenfold current capacity at the expense of voltage rating and board space-neither serves as a drop-in replacement.
Availability
ZTX758STZ is available at Aetrix Electronics and suitable for industrial power supplies, automotive relay drivers, lamp ballast controllers, and solenoid interfaces requiring stable component supply across extended temperature ranges and high-reliability environments.
Supply support for ZTX758STZ 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, specializing in high-reliability power management, signal integrity, and protection solutions.
The ZTX758STZ belongs to Diodes' high-voltage transistor product line, engineered for robust switching and linear operation in harsh-environment applications including automotive, industrial controls, and lighting systems.
FAQ
What is the maximum safe operating voltage for ZTX758STZ in continuous DC applications?
The ZTX758STZ is rated for -400V collector-emitter voltage (VCEO) under DC conditions at TA = +25°C. For reliable long-term operation, design margins should limit steady-state VCE to ≤320V to accommodate transients, temperature effects, and manufacturing tolerances per JEDEC guidelines.
Does ZTX758STZ require a heatsink in typical 0.5A switching applications?
No heatsink is required if ambient temperature stays below 25°C and PCB copper area meets minimum recommended layout (RθJA = 175°C/W). At 0.5A and VCE(sat) = -300mV, power dissipation is ~150mW; junction temperature rise would be ~26°C above ambient-well within the +200°C limit.
How does the joggled lead configuration of ZTX758STZ affect PCB assembly?
The joggled leads on ZTX758STZ provide mechanical strain relief and improved coplanarity for automated through-hole insertion. They reduce solder joint stress during thermal cycling and enhance alignment accuracy on standard 2.54mm pitch pads, especially in high-volume wave-soldered assemblies.
Can ZTX758STZ replace ZTX757 in existing designs?
Yes, ZTX758STZ is a direct functional replacement for ZTX757, sharing identical E-Line package, pinout, and -400V rating. It improves upon ZTX757 with tighter VCE(sat) specification (-250mV vs. -300mV typ) and enhanced AEC-Q101 qualification, supporting upgraded reliability requirements without layout changes.
ZTX758STZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 400 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 200mA, 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)
ZTX758STZ FAQ
1.How can I place an order for ZTX758STZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX758STZ 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 ZTX758STZ reliable?
The price and inventory of ZTX758STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX758STZ is usually 5 days.
3.What payment methods are accepted for ZTX758STZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX758STZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX758STZ?
ZTX758STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX758STZ 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 ZTX758STZ?
For technical support, including ZTX758STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX758STZ requirements.
6.How does Aetrix verify that ZTX758STZ is sourced from the original manufacturer or authorized distributors?
All ZTX758STZ 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 ZTX758STZ meets industry standards.
7.What is the process for return or replacement of ZTX758STZ?
All ZTX758STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX758STZ, 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 ZTX758STZ part is unused and in its original packaging.
Return procedure for ZTX758STZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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