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Diodes Incorporated ZTX958STOB
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- Part No.:
- ZTX958STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX958STOB.pdf
- Description:
- TRANS PNP 400V 0.5A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:8,624
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Product details
Overview
ZTX958STOB from Diodes Incorporated is a PNP silicon planar medium-power high-current transistor rated for -400 V VCEO, -0.5 A continuous collector current, and 1.2 W power dissipation at 25°C ambient. It delivers low VCE(sat) (−150 mV @ −500 mA/−100 mA), high hFE (100–300), and 85 MHz fT, enabling use in high-voltage switching and linear amplification stages of industrial power supplies.
For engineers reviewing the ZTX958STOB datasheet, ZTX958STOB pinout, ZTX958STOB application, or ZTX958STOB equivalent, key selection criteria include its −400 V breakdown rating, thermal resistance (Rth(j-amb) = 150 °C/W), TO-92-compatible E-Line package, and verified performance across −55°C to +200°C junction temperature range.
Technical Context
This PNP bipolar junction transistor operates in common-emitter configuration with base-controlled current amplification. Its design emphasizes high-voltage blocking (VCEO = −400 V) and robust pulsed current handling (ICM = −1.5 A), supported by low saturation voltage and stable gain up to 1 A.
The device features a planar silicon structure optimized for medium-power switching and analog amplification. Thermal performance is defined by Rth(j-amb) = 150 °C/W (PCB-mounted, 1-inch² copper) and Rth(j-case) = 50 °C/W, enabling reliable operation under sustained load in thermally constrained enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −400 V - Sustains 400 V reverse collector-emitter voltage before breakdown, suitable for flyback snubbers and HV DC-DC stage switches |
| IC (cont.) | −0.5 A - Continuous safe operating collector current; defines max steady-state load drive capability |
| VCE(sat) | −150 mV @ −500 mA/−100 mA - Low conduction loss enables efficient switching in high-side PNP configurations |
| hFE | 100–300 @ −10 mA to −1 A - Wide current-range DC gain supports both small-signal biasing and power-stage current control |
| fT | 85 MHz @ −100 mA/−10 V - Enables RF-capable amplification and fast switching in <100 ns turn-on/off applications |
| Rth(j-amb) | 150 °C/W - Thermal limit on PCB mounting; requires ≥1 inch² copper pour for full 1.2 W dissipation at 25°C ambient |
| Tj Range | −55°C to +200°C - Qualified for extended-temperature industrial and automotive under-hood environments |
Pinout & Package
Package: E-Line TO-92-compatible plastic case (3-lead, straight lead form). Mounting requires minimum 1 inch² copper area on PCB for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current source terminal for PNP operation | Connected to higher potential rail; carries full load current; must be routed with low-inductance path in switching apps |
| B (Base) | Control input for minority-carrier injection | Requires negative drive relative to emitter; typical IB = −100 mA for full saturation at −500 mA IC |
| C (Collector) | Current sink terminal | Connected to load return or ground-referenced node; withstands −400 V reverse bias during inductive flyback |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | VCEO = −400 V ensures compatibility with 300–400 V DC bus topologies in industrial SMPS |
| Low saturation voltage | VCE(sat) ≤ −150 mV at −500 mA reduces conduction losses and self-heating in linear regulators |
| Wide gain bandwidth | hFE ≥ 100 up to −1 A and fT = 85 MHz support stable wideband amplification and fast switching |
| Extended temperature operation | Rated Tj = −55°C to +200°C enables deployment in motor drives and power converters without derating |
| SPICE model availability | Enables accurate transient simulation of switching waveforms and thermal stress in circuit-level verification |
Applications
| Industrial Power Supply Switching | High-Voltage Linear Regulator |
|---|---|
Use Scenario: Used as main switch in 200–400 V input flyback converter secondary-side synchronous rectifier or primary-side HV switch. IC Role / Device Role / Timing Role: PNP high-side switch controlling energy transfer timing via base pulse width modulation. Use Value: −400 V VCEO and −1.5 A ICM allow direct interface with 350 V DC bus without external clamping diodes. | Use Scenario: Functions as pass element in adjustable negative-output linear regulator delivering −12 V/−0.4 A. IC Role / Device Role / Timing Role: Current-amplifying series pass transistor regulating output voltage via feedback-controlled base current. Use Value: Low VCE(sat) (−150 mV) minimizes dropout voltage and improves efficiency at full load. |
| Motor Drive Protection Circuit | High-Reliability Signal Amplification |
Use Scenario: Implements overvoltage crowbar protection in brushed DC motor H-bridge gate driver supply rails. IC Role / Device Role / Timing Role: Fast-acting PNP clamp activated by Zener-triggered base bias to short faulted rail to ground. Use Value: 2400 ns toff and −400 V standoff enable sub-microsecond response to >350 V transients. | Use Scenario: Amplifies low-level sensor signals (e.g., thermocouple, strain gauge) in precision test equipment. IC Role / Device Role / Timing Role: High-gain, low-noise PNP preamplifier stage with stable hFE across temperature. Use Value: hFE = 200 @ −500 mA and minimal VBE drift ensure consistent gain calibration over −40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX951 | VCEO = −200 V, IC = −0.5 A, Rth(j-amb) = 150 °C/W | Lower voltage rating limits use to ≤200 V systems; identical pinout and gain profile | Select when system bus voltage ≤200 V and cost sensitivity outweighs HV margin |
| BCW68G | VCEO = −60 V, IC = −0.8 A, fT = 150 MHz | Higher speed but insufficient for 300+ V flyback; suited for low-voltage RF amplification | Choose only for <60 V signal paths where gain-bandwidth product is critical |
Compared with ZTX958STOB, ZTX951 trades half the voltage rating for identical thermal and gain behavior, while BCW68G offers higher fT but fails to meet basic HV isolation requirements-making ZTX958STOB uniquely balanced for 400 V-class industrial switching.
Availability
ZTX958STOB is available at Aetrix Electronics and suitable for industrial power supplies, motor drive protection circuits, and high-reliability signal amplification requiring stable component supply across extended temperature ranges.
Supply support for ZTX958STOB 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 components for industrial, computing, and consumer markets.
The ZTX series targets medium-power bipolar transistors for demanding analog and switching applications, emphasizing extended temperature operation, high-voltage tolerance, and SPICE-model-supported design validation.
FAQ
What is the maximum safe operating voltage for ZTX958STOB in continuous mode?
The absolute maximum collector-emitter voltage (VCEO) is −400 V under DC conditions at Tj ≤ 150°C. Operation above −360 V is not recommended for long-term reliability without derating per the datasheet's SOA curve. Transient spikes up to −400 V are permissible only in single-pulse mode with duty cycle ≤2%.
Can ZTX958STOB be used in surface-mount designs?
No-ZTX958STOB uses an axial-leaded E-Line TO-92-compatible package designed exclusively for through-hole PCB mounting. Its thermal performance relies on soldered lead-to-copper thermal conduction; SMT variants like DPAK or SOT-223 equivalents are not available for this part number.
How does base drive requirement scale with collector current?
For reliable saturation, base current must be ≥1/10 of collector current (e.g., −100 mA IB for −1 A IC). The datasheet specifies VBE(sat) = −900 mV at −500 mA IC/−100 mA IB; lower IB ratios cause elevated VCE(sat) and thermal runaway risk.
Is SPICE modeling supported, and where can the model be obtained?
Yes-a validated SPICE model is provided by Diodes Incorporated in standard .lib format, covering DC, AC, and transient behavior across −55°C to +150°C. It is available for download from the official Diodes website product page for ZTX958STOB under "Design Resources" without registration.
ZTX958STOB 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):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 400 V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 100mA, 500mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 500mA, 10V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 85MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX958STOB FAQ
1.How can I place an order for ZTX958STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX958STOB 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 ZTX958STOB reliable?
The price and inventory of ZTX958STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX958STOB is usually 5 days.
3.What payment methods are accepted for ZTX958STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX958STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX958STOB?
ZTX958STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX958STOB 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 ZTX958STOB?
For technical support, including ZTX958STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX958STOB requirements.
6.How does Aetrix verify that ZTX958STOB is sourced from the original manufacturer or authorized distributors?
All ZTX958STOB 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 ZTX958STOB meets industry standards.
7.What is the process for return or replacement of ZTX958STOB?
All ZTX958STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZTX958STOB, 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 ZTX958STOB part is unused and in its original packaging.
Return procedure for ZTX958STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTX958STOB Tags
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